Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: init.c,v 1.209 2002/02/09 19:49:31 davem Exp $ |
| 2 | * arch/sparc64/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu) |
| 5 | * Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/config.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/string.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/bootmem.h> |
| 14 | #include <linux/mm.h> |
| 15 | #include <linux/hugetlb.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/initrd.h> |
| 18 | #include <linux/swap.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/seq_file.h> |
Prasanna S Panchamukhi | 05e14cb | 2005-09-06 15:19:30 -0700 | [diff] [blame] | 22 | #include <linux/kprobes.h> |
David S. Miller | 1ac4f5e | 2005-09-21 21:49:32 -0700 | [diff] [blame] | 23 | #include <linux/cache.h> |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 24 | #include <linux/sort.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <asm/head.h> |
| 27 | #include <asm/system.h> |
| 28 | #include <asm/page.h> |
| 29 | #include <asm/pgalloc.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | #include <asm/oplib.h> |
| 32 | #include <asm/iommu.h> |
| 33 | #include <asm/io.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | #include <asm/mmu_context.h> |
| 36 | #include <asm/tlbflush.h> |
| 37 | #include <asm/dma.h> |
| 38 | #include <asm/starfire.h> |
| 39 | #include <asm/tlb.h> |
| 40 | #include <asm/spitfire.h> |
| 41 | #include <asm/sections.h> |
| 42 | |
| 43 | extern void device_scan(void); |
| 44 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 45 | #define MAX_BANKS 32 |
David S. Miller | 1014757 | 2005-09-28 21:46:43 -0700 | [diff] [blame] | 46 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 47 | static struct linux_prom64_registers pavail[MAX_BANKS] __initdata; |
| 48 | static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata; |
| 49 | static int pavail_ents __initdata; |
| 50 | static int pavail_rescan_ents __initdata; |
David S. Miller | 1014757 | 2005-09-28 21:46:43 -0700 | [diff] [blame] | 51 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 52 | static int cmp_p64(const void *a, const void *b) |
| 53 | { |
| 54 | const struct linux_prom64_registers *x = a, *y = b; |
| 55 | |
| 56 | if (x->phys_addr > y->phys_addr) |
| 57 | return 1; |
| 58 | if (x->phys_addr < y->phys_addr) |
| 59 | return -1; |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static void __init read_obp_memory(const char *property, |
| 64 | struct linux_prom64_registers *regs, |
| 65 | int *num_ents) |
| 66 | { |
| 67 | int node = prom_finddevice("/memory"); |
| 68 | int prop_size = prom_getproplen(node, property); |
| 69 | int ents, ret, i; |
| 70 | |
| 71 | ents = prop_size / sizeof(struct linux_prom64_registers); |
| 72 | if (ents > MAX_BANKS) { |
| 73 | prom_printf("The machine has more %s property entries than " |
| 74 | "this kernel can support (%d).\n", |
| 75 | property, MAX_BANKS); |
| 76 | prom_halt(); |
| 77 | } |
| 78 | |
| 79 | ret = prom_getproperty(node, property, (char *) regs, prop_size); |
| 80 | if (ret == -1) { |
| 81 | prom_printf("Couldn't get %s property from /memory.\n"); |
| 82 | prom_halt(); |
| 83 | } |
| 84 | |
| 85 | *num_ents = ents; |
| 86 | |
| 87 | /* Sanitize what we got from the firmware, by page aligning |
| 88 | * everything. |
| 89 | */ |
| 90 | for (i = 0; i < ents; i++) { |
| 91 | unsigned long base, size; |
| 92 | |
| 93 | base = regs[i].phys_addr; |
| 94 | size = regs[i].reg_size; |
| 95 | |
| 96 | size &= PAGE_MASK; |
| 97 | if (base & ~PAGE_MASK) { |
| 98 | unsigned long new_base = PAGE_ALIGN(base); |
| 99 | |
| 100 | size -= new_base - base; |
| 101 | if ((long) size < 0L) |
| 102 | size = 0UL; |
| 103 | base = new_base; |
| 104 | } |
| 105 | regs[i].phys_addr = base; |
| 106 | regs[i].reg_size = size; |
| 107 | } |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 108 | sort(regs, ents, sizeof(struct linux_prom64_registers), |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 109 | cmp_p64, NULL); |
| 110 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 112 | unsigned long *sparc64_valid_addr_bitmap __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | /* Ugly, but necessary... -DaveM */ |
David S. Miller | 1ac4f5e | 2005-09-21 21:49:32 -0700 | [diff] [blame] | 115 | unsigned long phys_base __read_mostly; |
| 116 | unsigned long kern_base __read_mostly; |
| 117 | unsigned long kern_size __read_mostly; |
| 118 | unsigned long pfn_base __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | /* get_new_mmu_context() uses "cache + 1". */ |
| 121 | DEFINE_SPINLOCK(ctx_alloc_lock); |
| 122 | unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1; |
| 123 | #define CTX_BMAP_SLOTS (1UL << (CTX_NR_BITS - 6)) |
| 124 | unsigned long mmu_context_bmap[CTX_BMAP_SLOTS]; |
| 125 | |
| 126 | /* References to special section boundaries */ |
| 127 | extern char _start[], _end[]; |
| 128 | |
| 129 | /* Initial ramdisk setup */ |
| 130 | extern unsigned long sparc_ramdisk_image64; |
| 131 | extern unsigned int sparc_ramdisk_image; |
| 132 | extern unsigned int sparc_ramdisk_size; |
| 133 | |
David S. Miller | 1ac4f5e | 2005-09-21 21:49:32 -0700 | [diff] [blame] | 134 | struct page *mem_map_zero __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 136 | unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly; |
| 137 | |
| 138 | unsigned long sparc64_kern_pri_context __read_mostly; |
| 139 | unsigned long sparc64_kern_pri_nuc_bits __read_mostly; |
| 140 | unsigned long sparc64_kern_sec_context __read_mostly; |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | int bigkernel = 0; |
| 143 | |
David S. Miller | 3c93646 | 2006-01-31 18:30:27 -0800 | [diff] [blame] | 144 | kmem_cache_t *pgtable_cache __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
David S. Miller | 3c93646 | 2006-01-31 18:30:27 -0800 | [diff] [blame] | 146 | static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
David S. Miller | 3c93646 | 2006-01-31 18:30:27 -0800 | [diff] [blame] | 148 | clear_page(addr); |
| 149 | } |
| 150 | |
| 151 | void pgtable_cache_init(void) |
| 152 | { |
| 153 | pgtable_cache = kmem_cache_create("pgtable_cache", |
| 154 | PAGE_SIZE, PAGE_SIZE, |
| 155 | SLAB_HWCACHE_ALIGN | |
| 156 | SLAB_MUST_HWCACHE_ALIGN, |
| 157 | zero_ctor, |
| 158 | NULL); |
| 159 | if (!pgtable_cache) { |
| 160 | prom_printf("pgtable_cache_init(): Could not create!\n"); |
| 161 | prom_halt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | #ifdef CONFIG_DEBUG_DCFLUSH |
| 166 | atomic_t dcpage_flushes = ATOMIC_INIT(0); |
| 167 | #ifdef CONFIG_SMP |
| 168 | atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0); |
| 169 | #endif |
| 170 | #endif |
| 171 | |
| 172 | __inline__ void flush_dcache_page_impl(struct page *page) |
| 173 | { |
| 174 | #ifdef CONFIG_DEBUG_DCFLUSH |
| 175 | atomic_inc(&dcpage_flushes); |
| 176 | #endif |
| 177 | |
| 178 | #ifdef DCACHE_ALIASING_POSSIBLE |
| 179 | __flush_dcache_page(page_address(page), |
| 180 | ((tlb_type == spitfire) && |
| 181 | page_mapping(page) != NULL)); |
| 182 | #else |
| 183 | if (page_mapping(page) != NULL && |
| 184 | tlb_type == spitfire) |
| 185 | __flush_icache_page(__pa(page_address(page))); |
| 186 | #endif |
| 187 | } |
| 188 | |
| 189 | #define PG_dcache_dirty PG_arch_1 |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 190 | #define PG_dcache_cpu_shift 24 |
| 191 | #define PG_dcache_cpu_mask (256 - 1) |
| 192 | |
| 193 | #if NR_CPUS > 256 |
| 194 | #error D-cache dirty tracking and thread_info->cpu need fixing for > 256 cpus |
| 195 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | #define dcache_dirty_cpu(page) \ |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 198 | (((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | static __inline__ void set_dcache_dirty(struct page *page, int this_cpu) |
| 201 | { |
| 202 | unsigned long mask = this_cpu; |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 203 | unsigned long non_cpu_bits; |
| 204 | |
| 205 | non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift); |
| 206 | mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty); |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | __asm__ __volatile__("1:\n\t" |
| 209 | "ldx [%2], %%g7\n\t" |
| 210 | "and %%g7, %1, %%g1\n\t" |
| 211 | "or %%g1, %0, %%g1\n\t" |
| 212 | "casx [%2], %%g7, %%g1\n\t" |
| 213 | "cmp %%g7, %%g1\n\t" |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 214 | "membar #StoreLoad | #StoreStore\n\t" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | "bne,pn %%xcc, 1b\n\t" |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 216 | " nop" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | : /* no outputs */ |
| 218 | : "r" (mask), "r" (non_cpu_bits), "r" (&page->flags) |
| 219 | : "g1", "g7"); |
| 220 | } |
| 221 | |
| 222 | static __inline__ void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu) |
| 223 | { |
| 224 | unsigned long mask = (1UL << PG_dcache_dirty); |
| 225 | |
| 226 | __asm__ __volatile__("! test_and_clear_dcache_dirty\n" |
| 227 | "1:\n\t" |
| 228 | "ldx [%2], %%g7\n\t" |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 229 | "srlx %%g7, %4, %%g1\n\t" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | "and %%g1, %3, %%g1\n\t" |
| 231 | "cmp %%g1, %0\n\t" |
| 232 | "bne,pn %%icc, 2f\n\t" |
| 233 | " andn %%g7, %1, %%g1\n\t" |
| 234 | "casx [%2], %%g7, %%g1\n\t" |
| 235 | "cmp %%g7, %%g1\n\t" |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 236 | "membar #StoreLoad | #StoreStore\n\t" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | "bne,pn %%xcc, 1b\n\t" |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 238 | " nop\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | "2:" |
| 240 | : /* no outputs */ |
| 241 | : "r" (cpu), "r" (mask), "r" (&page->flags), |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 242 | "i" (PG_dcache_cpu_mask), |
| 243 | "i" (PG_dcache_cpu_shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | : "g1", "g7"); |
| 245 | } |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) |
| 248 | { |
David S. Miller | bd40791 | 2006-01-31 18:31:38 -0800 | [diff] [blame^] | 249 | struct mm_struct *mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | struct page *page; |
| 251 | unsigned long pfn; |
| 252 | unsigned long pg_flags; |
David S. Miller | bd40791 | 2006-01-31 18:31:38 -0800 | [diff] [blame^] | 253 | unsigned long mm_rss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | pfn = pte_pfn(pte); |
| 256 | if (pfn_valid(pfn) && |
| 257 | (page = pfn_to_page(pfn), page_mapping(page)) && |
| 258 | ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) { |
David S. Miller | 48b0e54 | 2005-07-27 16:08:44 -0700 | [diff] [blame] | 259 | int cpu = ((pg_flags >> PG_dcache_cpu_shift) & |
| 260 | PG_dcache_cpu_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | int this_cpu = get_cpu(); |
| 262 | |
| 263 | /* This is just to optimize away some function calls |
| 264 | * in the SMP case. |
| 265 | */ |
| 266 | if (cpu == this_cpu) |
| 267 | flush_dcache_page_impl(page); |
| 268 | else |
| 269 | smp_flush_dcache_page_impl(page, cpu); |
| 270 | |
| 271 | clear_dcache_dirty_cpu(page, cpu); |
| 272 | |
| 273 | put_cpu(); |
| 274 | } |
David S. Miller | bd40791 | 2006-01-31 18:31:38 -0800 | [diff] [blame^] | 275 | |
| 276 | mm = vma->vm_mm; |
| 277 | mm_rss = get_mm_rss(mm); |
| 278 | if (mm_rss >= mm->context.tsb_rss_limit) |
| 279 | tsb_grow(mm, mm_rss, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | void flush_dcache_page(struct page *page) |
| 283 | { |
David S. Miller | a9546f5 | 2005-04-17 18:03:09 -0700 | [diff] [blame] | 284 | struct address_space *mapping; |
| 285 | int this_cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
David S. Miller | a9546f5 | 2005-04-17 18:03:09 -0700 | [diff] [blame] | 287 | /* Do not bother with the expensive D-cache flush if it |
| 288 | * is merely the zero page. The 'bigcore' testcase in GDB |
| 289 | * causes this case to run millions of times. |
| 290 | */ |
| 291 | if (page == ZERO_PAGE(0)) |
| 292 | return; |
| 293 | |
| 294 | this_cpu = get_cpu(); |
| 295 | |
| 296 | mapping = page_mapping(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (mapping && !mapping_mapped(mapping)) { |
David S. Miller | a9546f5 | 2005-04-17 18:03:09 -0700 | [diff] [blame] | 298 | int dirty = test_bit(PG_dcache_dirty, &page->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | if (dirty) { |
David S. Miller | a9546f5 | 2005-04-17 18:03:09 -0700 | [diff] [blame] | 300 | int dirty_cpu = dcache_dirty_cpu(page); |
| 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | if (dirty_cpu == this_cpu) |
| 303 | goto out; |
| 304 | smp_flush_dcache_page_impl(page, dirty_cpu); |
| 305 | } |
| 306 | set_dcache_dirty(page, this_cpu); |
| 307 | } else { |
| 308 | /* We could delay the flush for the !page_mapping |
| 309 | * case too. But that case is for exec env/arg |
| 310 | * pages and those are %99 certainly going to get |
| 311 | * faulted into the tlb (and thus flushed) anyways. |
| 312 | */ |
| 313 | flush_dcache_page_impl(page); |
| 314 | } |
| 315 | |
| 316 | out: |
| 317 | put_cpu(); |
| 318 | } |
| 319 | |
Prasanna S Panchamukhi | 05e14cb | 2005-09-06 15:19:30 -0700 | [diff] [blame] | 320 | void __kprobes flush_icache_range(unsigned long start, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | { |
| 322 | /* Cheetah has coherent I-cache. */ |
| 323 | if (tlb_type == spitfire) { |
| 324 | unsigned long kaddr; |
| 325 | |
| 326 | for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE) |
| 327 | __flush_icache_page(__get_phys(kaddr)); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | unsigned long page_to_pfn(struct page *page) |
| 332 | { |
| 333 | return (unsigned long) ((page - mem_map) + pfn_base); |
| 334 | } |
| 335 | |
| 336 | struct page *pfn_to_page(unsigned long pfn) |
| 337 | { |
| 338 | return (mem_map + (pfn - pfn_base)); |
| 339 | } |
| 340 | |
| 341 | void show_mem(void) |
| 342 | { |
| 343 | printk("Mem-info:\n"); |
| 344 | show_free_areas(); |
| 345 | printk("Free swap: %6ldkB\n", |
| 346 | nr_swap_pages << (PAGE_SHIFT-10)); |
| 347 | printk("%ld pages of RAM\n", num_physpages); |
| 348 | printk("%d free pages\n", nr_free_pages()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | void mmu_info(struct seq_file *m) |
| 352 | { |
| 353 | if (tlb_type == cheetah) |
| 354 | seq_printf(m, "MMU Type\t: Cheetah\n"); |
| 355 | else if (tlb_type == cheetah_plus) |
| 356 | seq_printf(m, "MMU Type\t: Cheetah+\n"); |
| 357 | else if (tlb_type == spitfire) |
| 358 | seq_printf(m, "MMU Type\t: Spitfire\n"); |
| 359 | else |
| 360 | seq_printf(m, "MMU Type\t: ???\n"); |
| 361 | |
| 362 | #ifdef CONFIG_DEBUG_DCFLUSH |
| 363 | seq_printf(m, "DCPageFlushes\t: %d\n", |
| 364 | atomic_read(&dcpage_flushes)); |
| 365 | #ifdef CONFIG_SMP |
| 366 | seq_printf(m, "DCPageFlushesXC\t: %d\n", |
| 367 | atomic_read(&dcpage_flushes_xcall)); |
| 368 | #endif /* CONFIG_SMP */ |
| 369 | #endif /* CONFIG_DEBUG_DCFLUSH */ |
| 370 | } |
| 371 | |
| 372 | struct linux_prom_translation { |
| 373 | unsigned long virt; |
| 374 | unsigned long size; |
| 375 | unsigned long data; |
| 376 | }; |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 377 | |
| 378 | /* Exported for kernel TLB miss handling in ktlb.S */ |
| 379 | struct linux_prom_translation prom_trans[512] __read_mostly; |
| 380 | unsigned int prom_trans_ents __read_mostly; |
| 381 | unsigned int swapper_pgd_zero __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | extern unsigned long prom_boot_page; |
| 384 | extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle); |
| 385 | extern int prom_get_mmu_ihandle(void); |
| 386 | extern void register_prom_callbacks(void); |
| 387 | |
| 388 | /* Exported for SMP bootup purposes. */ |
| 389 | unsigned long kern_locked_tte_data; |
| 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | /* |
| 392 | * Translate PROM's mapping we capture at boot time into physical address. |
| 393 | * The second parameter is only set from prom_callback() invocations. |
| 394 | */ |
| 395 | unsigned long prom_virt_to_phys(unsigned long promva, int *error) |
| 396 | { |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 397 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 399 | for (i = 0; i < prom_trans_ents; i++) { |
| 400 | struct linux_prom_translation *p = &prom_trans[i]; |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 401 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 402 | if (promva >= p->virt && |
| 403 | promva < (p->virt + p->size)) { |
| 404 | unsigned long base = p->data & _PAGE_PADDR; |
| 405 | |
| 406 | if (error) |
| 407 | *error = 0; |
| 408 | return base + (promva & (8192 - 1)); |
| 409 | } |
| 410 | } |
| 411 | if (error) |
| 412 | *error = 1; |
| 413 | return 0UL; |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | /* The obp translations are saved based on 8k pagesize, since obp can |
| 417 | * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS -> |
David S. Miller | 74bf431 | 2006-01-31 18:29:18 -0800 | [diff] [blame] | 418 | * HI_OBP_ADDRESS range are handled in ktlb.S. |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 419 | */ |
David S. Miller | 5085b4a | 2005-09-22 00:45:41 -0700 | [diff] [blame] | 420 | static inline int in_obp_range(unsigned long vaddr) |
| 421 | { |
| 422 | return (vaddr >= LOW_OBP_ADDRESS && |
| 423 | vaddr < HI_OBP_ADDRESS); |
| 424 | } |
| 425 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 426 | static int cmp_ptrans(const void *a, const void *b) |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 427 | { |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 428 | const struct linux_prom_translation *x = a, *y = b; |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 429 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 430 | if (x->virt > y->virt) |
| 431 | return 1; |
| 432 | if (x->virt < y->virt) |
| 433 | return -1; |
| 434 | return 0; |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 435 | } |
| 436 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 437 | /* Read OBP translations property into 'prom_trans[]'. */ |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 438 | static void __init read_obp_translations(void) |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 439 | { |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 440 | int n, node, ents, first, last, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | node = prom_finddevice("/virtual-memory"); |
| 443 | n = prom_getproplen(node, "translations"); |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 444 | if (unlikely(n == 0 || n == -1)) { |
David S. Miller | b206fc4 | 2005-09-21 22:31:13 -0700 | [diff] [blame] | 445 | prom_printf("prom_mappings: Couldn't get size.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | prom_halt(); |
| 447 | } |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 448 | if (unlikely(n > sizeof(prom_trans))) { |
| 449 | prom_printf("prom_mappings: Size %Zd is too big.\n", n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | prom_halt(); |
| 451 | } |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 452 | |
David S. Miller | b206fc4 | 2005-09-21 22:31:13 -0700 | [diff] [blame] | 453 | if ((n = prom_getproperty(node, "translations", |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 454 | (char *)&prom_trans[0], |
| 455 | sizeof(prom_trans))) == -1) { |
David S. Miller | b206fc4 | 2005-09-21 22:31:13 -0700 | [diff] [blame] | 456 | prom_printf("prom_mappings: Couldn't get property.\n"); |
| 457 | prom_halt(); |
| 458 | } |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 459 | |
David S. Miller | b206fc4 | 2005-09-21 22:31:13 -0700 | [diff] [blame] | 460 | n = n / sizeof(struct linux_prom_translation); |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 461 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 462 | ents = n; |
| 463 | |
| 464 | sort(prom_trans, ents, sizeof(struct linux_prom_translation), |
| 465 | cmp_ptrans, NULL); |
| 466 | |
| 467 | /* Now kick out all the non-OBP entries. */ |
| 468 | for (i = 0; i < ents; i++) { |
| 469 | if (in_obp_range(prom_trans[i].virt)) |
| 470 | break; |
| 471 | } |
| 472 | first = i; |
| 473 | for (; i < ents; i++) { |
| 474 | if (!in_obp_range(prom_trans[i].virt)) |
| 475 | break; |
| 476 | } |
| 477 | last = i; |
| 478 | |
| 479 | for (i = 0; i < (last - first); i++) { |
| 480 | struct linux_prom_translation *src = &prom_trans[i + first]; |
| 481 | struct linux_prom_translation *dest = &prom_trans[i]; |
| 482 | |
| 483 | *dest = *src; |
| 484 | } |
| 485 | for (; i < ents; i++) { |
| 486 | struct linux_prom_translation *dest = &prom_trans[i]; |
| 487 | dest->virt = dest->size = dest->data = 0x0UL; |
| 488 | } |
| 489 | |
| 490 | prom_trans_ents = last - first; |
| 491 | |
| 492 | if (tlb_type == spitfire) { |
| 493 | /* Clear diag TTE bits. */ |
| 494 | for (i = 0; i < prom_trans_ents; i++) |
| 495 | prom_trans[i].data &= ~0x0003fe0000000000UL; |
| 496 | } |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 497 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
David S. Miller | 898cf0e | 2005-09-23 11:59:44 -0700 | [diff] [blame] | 499 | static void __init remap_kernel(void) |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 500 | { |
| 501 | unsigned long phys_page, tte_vaddr, tte_data; |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 502 | int tlb_ent = sparc64_highest_locked_tlbent(); |
| 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | tte_vaddr = (unsigned long) KERNBASE; |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 505 | phys_page = (prom_boot_mapping_phys_low >> 22UL) << 22UL; |
| 506 | tte_data = (phys_page | (_PAGE_VALID | _PAGE_SZ4MB | |
| 507 | _PAGE_CP | _PAGE_CV | _PAGE_P | |
| 508 | _PAGE_L | _PAGE_W)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | kern_locked_tte_data = tte_data; |
| 511 | |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 512 | /* Now lock us into the TLBs via OBP. */ |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 513 | prom_dtlb_load(tlb_ent, tte_data, tte_vaddr); |
| 514 | prom_itlb_load(tlb_ent, tte_data, tte_vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | if (bigkernel) { |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 516 | tlb_ent -= 1; |
| 517 | prom_dtlb_load(tlb_ent, |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 518 | tte_data + 0x400000, |
| 519 | tte_vaddr + 0x400000); |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 520 | prom_itlb_load(tlb_ent, |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 521 | tte_data + 0x400000, |
| 522 | tte_vaddr + 0x400000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 524 | sparc64_highest_unlocked_tlb_ent = tlb_ent - 1; |
| 525 | if (tlb_type == cheetah_plus) { |
| 526 | sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 | |
| 527 | CTX_CHEETAH_PLUS_NUC); |
| 528 | sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC; |
| 529 | sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0; |
| 530 | } |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 533 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 534 | static void __init inherit_prom_mappings(void) |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 535 | { |
| 536 | read_obp_translations(); |
David S. Miller | 405599b | 2005-09-22 00:12:35 -0700 | [diff] [blame] | 537 | |
| 538 | /* Now fixup OBP's idea about where we really are mapped. */ |
| 539 | prom_printf("Remapping the kernel... "); |
| 540 | remap_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | prom_printf("done.\n"); |
| 542 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 543 | prom_printf("Registering callbacks... "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | register_prom_callbacks(); |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 545 | prom_printf("done.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | static int prom_ditlb_set; |
| 549 | struct prom_tlb_entry { |
| 550 | int tlb_ent; |
| 551 | unsigned long tlb_tag; |
| 552 | unsigned long tlb_data; |
| 553 | }; |
| 554 | struct prom_tlb_entry prom_itlb[16], prom_dtlb[16]; |
| 555 | |
| 556 | void prom_world(int enter) |
| 557 | { |
| 558 | unsigned long pstate; |
| 559 | int i; |
| 560 | |
| 561 | if (!enter) |
| 562 | set_fs((mm_segment_t) { get_thread_current_ds() }); |
| 563 | |
| 564 | if (!prom_ditlb_set) |
| 565 | return; |
| 566 | |
| 567 | /* Make sure the following runs atomically. */ |
| 568 | __asm__ __volatile__("flushw\n\t" |
| 569 | "rdpr %%pstate, %0\n\t" |
| 570 | "wrpr %0, %1, %%pstate" |
| 571 | : "=r" (pstate) |
| 572 | : "i" (PSTATE_IE)); |
| 573 | |
| 574 | if (enter) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* Install PROM world. */ |
| 576 | for (i = 0; i < 16; i++) { |
| 577 | if (prom_dtlb[i].tlb_ent != -1) { |
| 578 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 579 | "membar #Sync" |
| 580 | : : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS), |
| 581 | "i" (ASI_DMMU)); |
| 582 | if (tlb_type == spitfire) |
| 583 | spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent, |
| 584 | prom_dtlb[i].tlb_data); |
| 585 | else if (tlb_type == cheetah || tlb_type == cheetah_plus) |
| 586 | cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent, |
| 587 | prom_dtlb[i].tlb_data); |
| 588 | } |
| 589 | if (prom_itlb[i].tlb_ent != -1) { |
| 590 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 591 | "membar #Sync" |
| 592 | : : "r" (prom_itlb[i].tlb_tag), |
| 593 | "r" (TLB_TAG_ACCESS), |
| 594 | "i" (ASI_IMMU)); |
| 595 | if (tlb_type == spitfire) |
| 596 | spitfire_put_itlb_data(prom_itlb[i].tlb_ent, |
| 597 | prom_itlb[i].tlb_data); |
| 598 | else if (tlb_type == cheetah || tlb_type == cheetah_plus) |
| 599 | cheetah_put_litlb_data(prom_itlb[i].tlb_ent, |
| 600 | prom_itlb[i].tlb_data); |
| 601 | } |
| 602 | } |
| 603 | } else { |
| 604 | for (i = 0; i < 16; i++) { |
| 605 | if (prom_dtlb[i].tlb_ent != -1) { |
| 606 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 607 | "membar #Sync" |
| 608 | : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU)); |
| 609 | if (tlb_type == spitfire) |
| 610 | spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent, 0x0UL); |
| 611 | else |
| 612 | cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent, 0x0UL); |
| 613 | } |
| 614 | if (prom_itlb[i].tlb_ent != -1) { |
| 615 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 616 | "membar #Sync" |
| 617 | : : "r" (TLB_TAG_ACCESS), |
| 618 | "i" (ASI_IMMU)); |
| 619 | if (tlb_type == spitfire) |
| 620 | spitfire_put_itlb_data(prom_itlb[i].tlb_ent, 0x0UL); |
| 621 | else |
| 622 | cheetah_put_litlb_data(prom_itlb[i].tlb_ent, 0x0UL); |
| 623 | } |
| 624 | } |
| 625 | } |
| 626 | __asm__ __volatile__("wrpr %0, 0, %%pstate" |
| 627 | : : "r" (pstate)); |
| 628 | } |
| 629 | |
| 630 | void inherit_locked_prom_mappings(int save_p) |
| 631 | { |
| 632 | int i; |
| 633 | int dtlb_seen = 0; |
| 634 | int itlb_seen = 0; |
| 635 | |
| 636 | /* Fucking losing PROM has more mappings in the TLB, but |
| 637 | * it (conveniently) fails to mention any of these in the |
| 638 | * translations property. The only ones that matter are |
| 639 | * the locked PROM tlb entries, so we impose the following |
| 640 | * irrecovable rule on the PROM, it is allowed 8 locked |
| 641 | * entries in the ITLB and 8 in the DTLB. |
| 642 | * |
| 643 | * Supposedly the upper 16GB of the address space is |
| 644 | * reserved for OBP, BUT I WISH THIS WAS DOCUMENTED |
| 645 | * SOMEWHERE!!!!!!!!!!!!!!!!! Furthermore the entire interface |
| 646 | * used between the client program and the firmware on sun5 |
| 647 | * systems to coordinate mmu mappings is also COMPLETELY |
| 648 | * UNDOCUMENTED!!!!!! Thanks S(t)un! |
| 649 | */ |
| 650 | if (save_p) { |
| 651 | for (i = 0; i < 16; i++) { |
| 652 | prom_itlb[i].tlb_ent = -1; |
| 653 | prom_dtlb[i].tlb_ent = -1; |
| 654 | } |
| 655 | } |
| 656 | if (tlb_type == spitfire) { |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 657 | int high = sparc64_highest_unlocked_tlb_ent; |
| 658 | for (i = 0; i <= high; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | unsigned long data; |
| 660 | |
| 661 | /* Spitfire Errata #32 workaround */ |
| 662 | /* NOTE: Always runs on spitfire, so no cheetah+ |
| 663 | * page size encodings. |
| 664 | */ |
| 665 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 666 | "flush %%g6" |
| 667 | : /* No outputs */ |
| 668 | : "r" (0), |
| 669 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 670 | |
| 671 | data = spitfire_get_dtlb_data(i); |
| 672 | if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) { |
| 673 | unsigned long tag; |
| 674 | |
| 675 | /* Spitfire Errata #32 workaround */ |
| 676 | /* NOTE: Always runs on spitfire, so no |
| 677 | * cheetah+ page size encodings. |
| 678 | */ |
| 679 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 680 | "flush %%g6" |
| 681 | : /* No outputs */ |
| 682 | : "r" (0), |
| 683 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 684 | |
| 685 | tag = spitfire_get_dtlb_tag(i); |
| 686 | if (save_p) { |
| 687 | prom_dtlb[dtlb_seen].tlb_ent = i; |
| 688 | prom_dtlb[dtlb_seen].tlb_tag = tag; |
| 689 | prom_dtlb[dtlb_seen].tlb_data = data; |
| 690 | } |
| 691 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 692 | "membar #Sync" |
| 693 | : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU)); |
| 694 | spitfire_put_dtlb_data(i, 0x0UL); |
| 695 | |
| 696 | dtlb_seen++; |
| 697 | if (dtlb_seen > 15) |
| 698 | break; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | for (i = 0; i < high; i++) { |
| 703 | unsigned long data; |
| 704 | |
| 705 | /* Spitfire Errata #32 workaround */ |
| 706 | /* NOTE: Always runs on spitfire, so no |
| 707 | * cheetah+ page size encodings. |
| 708 | */ |
| 709 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 710 | "flush %%g6" |
| 711 | : /* No outputs */ |
| 712 | : "r" (0), |
| 713 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 714 | |
| 715 | data = spitfire_get_itlb_data(i); |
| 716 | if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) { |
| 717 | unsigned long tag; |
| 718 | |
| 719 | /* Spitfire Errata #32 workaround */ |
| 720 | /* NOTE: Always runs on spitfire, so no |
| 721 | * cheetah+ page size encodings. |
| 722 | */ |
| 723 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 724 | "flush %%g6" |
| 725 | : /* No outputs */ |
| 726 | : "r" (0), |
| 727 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 728 | |
| 729 | tag = spitfire_get_itlb_tag(i); |
| 730 | if (save_p) { |
| 731 | prom_itlb[itlb_seen].tlb_ent = i; |
| 732 | prom_itlb[itlb_seen].tlb_tag = tag; |
| 733 | prom_itlb[itlb_seen].tlb_data = data; |
| 734 | } |
| 735 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 736 | "membar #Sync" |
| 737 | : : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU)); |
| 738 | spitfire_put_itlb_data(i, 0x0UL); |
| 739 | |
| 740 | itlb_seen++; |
| 741 | if (itlb_seen > 15) |
| 742 | break; |
| 743 | } |
| 744 | } |
| 745 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 746 | int high = sparc64_highest_unlocked_tlb_ent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 748 | for (i = 0; i <= high; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | unsigned long data; |
| 750 | |
| 751 | data = cheetah_get_ldtlb_data(i); |
| 752 | if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) { |
| 753 | unsigned long tag; |
| 754 | |
| 755 | tag = cheetah_get_ldtlb_tag(i); |
| 756 | if (save_p) { |
| 757 | prom_dtlb[dtlb_seen].tlb_ent = i; |
| 758 | prom_dtlb[dtlb_seen].tlb_tag = tag; |
| 759 | prom_dtlb[dtlb_seen].tlb_data = data; |
| 760 | } |
| 761 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 762 | "membar #Sync" |
| 763 | : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU)); |
| 764 | cheetah_put_ldtlb_data(i, 0x0UL); |
| 765 | |
| 766 | dtlb_seen++; |
| 767 | if (dtlb_seen > 15) |
| 768 | break; |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | for (i = 0; i < high; i++) { |
| 773 | unsigned long data; |
| 774 | |
| 775 | data = cheetah_get_litlb_data(i); |
| 776 | if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) { |
| 777 | unsigned long tag; |
| 778 | |
| 779 | tag = cheetah_get_litlb_tag(i); |
| 780 | if (save_p) { |
| 781 | prom_itlb[itlb_seen].tlb_ent = i; |
| 782 | prom_itlb[itlb_seen].tlb_tag = tag; |
| 783 | prom_itlb[itlb_seen].tlb_data = data; |
| 784 | } |
| 785 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 786 | "membar #Sync" |
| 787 | : : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU)); |
| 788 | cheetah_put_litlb_data(i, 0x0UL); |
| 789 | |
| 790 | itlb_seen++; |
| 791 | if (itlb_seen > 15) |
| 792 | break; |
| 793 | } |
| 794 | } |
| 795 | } else { |
| 796 | /* Implement me :-) */ |
| 797 | BUG(); |
| 798 | } |
| 799 | if (save_p) |
| 800 | prom_ditlb_set = 1; |
| 801 | } |
| 802 | |
| 803 | /* Give PROM back his world, done during reboots... */ |
| 804 | void prom_reload_locked(void) |
| 805 | { |
| 806 | int i; |
| 807 | |
| 808 | for (i = 0; i < 16; i++) { |
| 809 | if (prom_dtlb[i].tlb_ent != -1) { |
| 810 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 811 | "membar #Sync" |
| 812 | : : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS), |
| 813 | "i" (ASI_DMMU)); |
| 814 | if (tlb_type == spitfire) |
| 815 | spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent, |
| 816 | prom_dtlb[i].tlb_data); |
| 817 | else if (tlb_type == cheetah || tlb_type == cheetah_plus) |
| 818 | cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent, |
| 819 | prom_dtlb[i].tlb_data); |
| 820 | } |
| 821 | |
| 822 | if (prom_itlb[i].tlb_ent != -1) { |
| 823 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 824 | "membar #Sync" |
| 825 | : : "r" (prom_itlb[i].tlb_tag), |
| 826 | "r" (TLB_TAG_ACCESS), |
| 827 | "i" (ASI_IMMU)); |
| 828 | if (tlb_type == spitfire) |
| 829 | spitfire_put_itlb_data(prom_itlb[i].tlb_ent, |
| 830 | prom_itlb[i].tlb_data); |
| 831 | else |
| 832 | cheetah_put_litlb_data(prom_itlb[i].tlb_ent, |
| 833 | prom_itlb[i].tlb_data); |
| 834 | } |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | #ifdef DCACHE_ALIASING_POSSIBLE |
| 839 | void __flush_dcache_range(unsigned long start, unsigned long end) |
| 840 | { |
| 841 | unsigned long va; |
| 842 | |
| 843 | if (tlb_type == spitfire) { |
| 844 | int n = 0; |
| 845 | |
| 846 | for (va = start; va < end; va += 32) { |
| 847 | spitfire_put_dcache_tag(va & 0x3fe0, 0x0); |
| 848 | if (++n >= 512) |
| 849 | break; |
| 850 | } |
| 851 | } else { |
| 852 | start = __pa(start); |
| 853 | end = __pa(end); |
| 854 | for (va = start; va < end; va += 32) |
| 855 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 856 | "membar #Sync" |
| 857 | : /* no outputs */ |
| 858 | : "r" (va), |
| 859 | "i" (ASI_DCACHE_INVALIDATE)); |
| 860 | } |
| 861 | } |
| 862 | #endif /* DCACHE_ALIASING_POSSIBLE */ |
| 863 | |
| 864 | /* If not locked, zap it. */ |
| 865 | void __flush_tlb_all(void) |
| 866 | { |
| 867 | unsigned long pstate; |
| 868 | int i; |
| 869 | |
| 870 | __asm__ __volatile__("flushw\n\t" |
| 871 | "rdpr %%pstate, %0\n\t" |
| 872 | "wrpr %0, %1, %%pstate" |
| 873 | : "=r" (pstate) |
| 874 | : "i" (PSTATE_IE)); |
| 875 | if (tlb_type == spitfire) { |
| 876 | for (i = 0; i < 64; i++) { |
| 877 | /* Spitfire Errata #32 workaround */ |
| 878 | /* NOTE: Always runs on spitfire, so no |
| 879 | * cheetah+ page size encodings. |
| 880 | */ |
| 881 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 882 | "flush %%g6" |
| 883 | : /* No outputs */ |
| 884 | : "r" (0), |
| 885 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 886 | |
| 887 | if (!(spitfire_get_dtlb_data(i) & _PAGE_L)) { |
| 888 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 889 | "membar #Sync" |
| 890 | : /* no outputs */ |
| 891 | : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU)); |
| 892 | spitfire_put_dtlb_data(i, 0x0UL); |
| 893 | } |
| 894 | |
| 895 | /* Spitfire Errata #32 workaround */ |
| 896 | /* NOTE: Always runs on spitfire, so no |
| 897 | * cheetah+ page size encodings. |
| 898 | */ |
| 899 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" |
| 900 | "flush %%g6" |
| 901 | : /* No outputs */ |
| 902 | : "r" (0), |
| 903 | "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU)); |
| 904 | |
| 905 | if (!(spitfire_get_itlb_data(i) & _PAGE_L)) { |
| 906 | __asm__ __volatile__("stxa %%g0, [%0] %1\n\t" |
| 907 | "membar #Sync" |
| 908 | : /* no outputs */ |
| 909 | : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU)); |
| 910 | spitfire_put_itlb_data(i, 0x0UL); |
| 911 | } |
| 912 | } |
| 913 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
| 914 | cheetah_flush_dtlb_all(); |
| 915 | cheetah_flush_itlb_all(); |
| 916 | } |
| 917 | __asm__ __volatile__("wrpr %0, 0, %%pstate" |
| 918 | : : "r" (pstate)); |
| 919 | } |
| 920 | |
| 921 | /* Caller does TLB context flushing on local CPU if necessary. |
| 922 | * The caller also ensures that CTX_VALID(mm->context) is false. |
| 923 | * |
| 924 | * We must be careful about boundary cases so that we never |
| 925 | * let the user have CTX 0 (nucleus) or we ever use a CTX |
| 926 | * version of zero (and thus NO_CONTEXT would not be caught |
| 927 | * by version mis-match tests in mmu_context.h). |
| 928 | */ |
| 929 | void get_new_mmu_context(struct mm_struct *mm) |
| 930 | { |
| 931 | unsigned long ctx, new_ctx; |
| 932 | unsigned long orig_pgsz_bits; |
| 933 | |
| 934 | |
| 935 | spin_lock(&ctx_alloc_lock); |
| 936 | orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK); |
| 937 | ctx = (tlb_context_cache + 1) & CTX_NR_MASK; |
| 938 | new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx); |
| 939 | if (new_ctx >= (1 << CTX_NR_BITS)) { |
| 940 | new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1); |
| 941 | if (new_ctx >= ctx) { |
| 942 | int i; |
| 943 | new_ctx = (tlb_context_cache & CTX_VERSION_MASK) + |
| 944 | CTX_FIRST_VERSION; |
| 945 | if (new_ctx == 1) |
| 946 | new_ctx = CTX_FIRST_VERSION; |
| 947 | |
| 948 | /* Don't call memset, for 16 entries that's just |
| 949 | * plain silly... |
| 950 | */ |
| 951 | mmu_context_bmap[0] = 3; |
| 952 | mmu_context_bmap[1] = 0; |
| 953 | mmu_context_bmap[2] = 0; |
| 954 | mmu_context_bmap[3] = 0; |
| 955 | for (i = 4; i < CTX_BMAP_SLOTS; i += 4) { |
| 956 | mmu_context_bmap[i + 0] = 0; |
| 957 | mmu_context_bmap[i + 1] = 0; |
| 958 | mmu_context_bmap[i + 2] = 0; |
| 959 | mmu_context_bmap[i + 3] = 0; |
| 960 | } |
| 961 | goto out; |
| 962 | } |
| 963 | } |
| 964 | mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63)); |
| 965 | new_ctx |= (tlb_context_cache & CTX_VERSION_MASK); |
| 966 | out: |
| 967 | tlb_context_cache = new_ctx; |
| 968 | mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits; |
| 969 | spin_unlock(&ctx_alloc_lock); |
| 970 | } |
| 971 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | void sparc_ultra_dump_itlb(void) |
| 973 | { |
| 974 | int slot; |
| 975 | |
| 976 | if (tlb_type == spitfire) { |
| 977 | printk ("Contents of itlb: "); |
| 978 | for (slot = 0; slot < 14; slot++) printk (" "); |
| 979 | printk ("%2x:%016lx,%016lx\n", |
| 980 | 0, |
| 981 | spitfire_get_itlb_tag(0), spitfire_get_itlb_data(0)); |
| 982 | for (slot = 1; slot < 64; slot+=3) { |
| 983 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 984 | slot, |
| 985 | spitfire_get_itlb_tag(slot), spitfire_get_itlb_data(slot), |
| 986 | slot+1, |
| 987 | spitfire_get_itlb_tag(slot+1), spitfire_get_itlb_data(slot+1), |
| 988 | slot+2, |
| 989 | spitfire_get_itlb_tag(slot+2), spitfire_get_itlb_data(slot+2)); |
| 990 | } |
| 991 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
| 992 | printk ("Contents of itlb0:\n"); |
| 993 | for (slot = 0; slot < 16; slot+=2) { |
| 994 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 995 | slot, |
| 996 | cheetah_get_litlb_tag(slot), cheetah_get_litlb_data(slot), |
| 997 | slot+1, |
| 998 | cheetah_get_litlb_tag(slot+1), cheetah_get_litlb_data(slot+1)); |
| 999 | } |
| 1000 | printk ("Contents of itlb2:\n"); |
| 1001 | for (slot = 0; slot < 128; slot+=2) { |
| 1002 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 1003 | slot, |
| 1004 | cheetah_get_itlb_tag(slot), cheetah_get_itlb_data(slot), |
| 1005 | slot+1, |
| 1006 | cheetah_get_itlb_tag(slot+1), cheetah_get_itlb_data(slot+1)); |
| 1007 | } |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | void sparc_ultra_dump_dtlb(void) |
| 1012 | { |
| 1013 | int slot; |
| 1014 | |
| 1015 | if (tlb_type == spitfire) { |
| 1016 | printk ("Contents of dtlb: "); |
| 1017 | for (slot = 0; slot < 14; slot++) printk (" "); |
| 1018 | printk ("%2x:%016lx,%016lx\n", 0, |
| 1019 | spitfire_get_dtlb_tag(0), spitfire_get_dtlb_data(0)); |
| 1020 | for (slot = 1; slot < 64; slot+=3) { |
| 1021 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 1022 | slot, |
| 1023 | spitfire_get_dtlb_tag(slot), spitfire_get_dtlb_data(slot), |
| 1024 | slot+1, |
| 1025 | spitfire_get_dtlb_tag(slot+1), spitfire_get_dtlb_data(slot+1), |
| 1026 | slot+2, |
| 1027 | spitfire_get_dtlb_tag(slot+2), spitfire_get_dtlb_data(slot+2)); |
| 1028 | } |
| 1029 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
| 1030 | printk ("Contents of dtlb0:\n"); |
| 1031 | for (slot = 0; slot < 16; slot+=2) { |
| 1032 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 1033 | slot, |
| 1034 | cheetah_get_ldtlb_tag(slot), cheetah_get_ldtlb_data(slot), |
| 1035 | slot+1, |
| 1036 | cheetah_get_ldtlb_tag(slot+1), cheetah_get_ldtlb_data(slot+1)); |
| 1037 | } |
| 1038 | printk ("Contents of dtlb2:\n"); |
| 1039 | for (slot = 0; slot < 512; slot+=2) { |
| 1040 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 1041 | slot, |
| 1042 | cheetah_get_dtlb_tag(slot, 2), cheetah_get_dtlb_data(slot, 2), |
| 1043 | slot+1, |
| 1044 | cheetah_get_dtlb_tag(slot+1, 2), cheetah_get_dtlb_data(slot+1, 2)); |
| 1045 | } |
| 1046 | if (tlb_type == cheetah_plus) { |
| 1047 | printk ("Contents of dtlb3:\n"); |
| 1048 | for (slot = 0; slot < 512; slot+=2) { |
| 1049 | printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n", |
| 1050 | slot, |
| 1051 | cheetah_get_dtlb_tag(slot, 3), cheetah_get_dtlb_data(slot, 3), |
| 1052 | slot+1, |
| 1053 | cheetah_get_dtlb_tag(slot+1, 3), cheetah_get_dtlb_data(slot+1, 3)); |
| 1054 | } |
| 1055 | } |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | extern unsigned long cmdline_memory_size; |
| 1060 | |
| 1061 | unsigned long __init bootmem_init(unsigned long *pages_avail) |
| 1062 | { |
| 1063 | unsigned long bootmap_size, start_pfn, end_pfn; |
| 1064 | unsigned long end_of_phys_memory = 0UL; |
| 1065 | unsigned long bootmap_pfn, bytes_avail, size; |
| 1066 | int i; |
| 1067 | |
| 1068 | #ifdef CONFIG_DEBUG_BOOTMEM |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1069 | prom_printf("bootmem_init: Scan pavail, "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | #endif |
| 1071 | |
| 1072 | bytes_avail = 0UL; |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1073 | for (i = 0; i < pavail_ents; i++) { |
| 1074 | end_of_phys_memory = pavail[i].phys_addr + |
| 1075 | pavail[i].reg_size; |
| 1076 | bytes_avail += pavail[i].reg_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | if (cmdline_memory_size) { |
| 1078 | if (bytes_avail > cmdline_memory_size) { |
| 1079 | unsigned long slack = bytes_avail - cmdline_memory_size; |
| 1080 | |
| 1081 | bytes_avail -= slack; |
| 1082 | end_of_phys_memory -= slack; |
| 1083 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1084 | pavail[i].reg_size -= slack; |
| 1085 | if ((long)pavail[i].reg_size <= 0L) { |
| 1086 | pavail[i].phys_addr = 0xdeadbeefUL; |
| 1087 | pavail[i].reg_size = 0UL; |
| 1088 | pavail_ents = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } else { |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1090 | pavail[i+1].reg_size = 0Ul; |
| 1091 | pavail[i+1].phys_addr = 0xdeadbeefUL; |
| 1092 | pavail_ents = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | } |
| 1094 | break; |
| 1095 | } |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | *pages_avail = bytes_avail >> PAGE_SHIFT; |
| 1100 | |
| 1101 | /* Start with page aligned address of last symbol in kernel |
| 1102 | * image. The kernel is hard mapped below PAGE_OFFSET in a |
| 1103 | * 4MB locked TLB translation. |
| 1104 | */ |
| 1105 | start_pfn = PAGE_ALIGN(kern_base + kern_size) >> PAGE_SHIFT; |
| 1106 | |
| 1107 | bootmap_pfn = start_pfn; |
| 1108 | |
| 1109 | end_pfn = end_of_phys_memory >> PAGE_SHIFT; |
| 1110 | |
| 1111 | #ifdef CONFIG_BLK_DEV_INITRD |
| 1112 | /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ |
| 1113 | if (sparc_ramdisk_image || sparc_ramdisk_image64) { |
| 1114 | unsigned long ramdisk_image = sparc_ramdisk_image ? |
| 1115 | sparc_ramdisk_image : sparc_ramdisk_image64; |
| 1116 | if (ramdisk_image >= (unsigned long)_end - 2 * PAGE_SIZE) |
| 1117 | ramdisk_image -= KERNBASE; |
| 1118 | initrd_start = ramdisk_image + phys_base; |
| 1119 | initrd_end = initrd_start + sparc_ramdisk_size; |
| 1120 | if (initrd_end > end_of_phys_memory) { |
| 1121 | printk(KERN_CRIT "initrd extends beyond end of memory " |
| 1122 | "(0x%016lx > 0x%016lx)\ndisabling initrd\n", |
| 1123 | initrd_end, end_of_phys_memory); |
| 1124 | initrd_start = 0; |
| 1125 | } |
| 1126 | if (initrd_start) { |
| 1127 | if (initrd_start >= (start_pfn << PAGE_SHIFT) && |
| 1128 | initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) |
| 1129 | bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; |
| 1130 | } |
| 1131 | } |
| 1132 | #endif |
| 1133 | /* Initialize the boot-time allocator. */ |
| 1134 | max_pfn = max_low_pfn = end_pfn; |
| 1135 | min_low_pfn = pfn_base; |
| 1136 | |
| 1137 | #ifdef CONFIG_DEBUG_BOOTMEM |
| 1138 | prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n", |
| 1139 | min_low_pfn, bootmap_pfn, max_low_pfn); |
| 1140 | #endif |
| 1141 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, end_pfn); |
| 1142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | /* Now register the available physical memory with the |
| 1144 | * allocator. |
| 1145 | */ |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1146 | for (i = 0; i < pavail_ents; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | #ifdef CONFIG_DEBUG_BOOTMEM |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1148 | prom_printf("free_bootmem(pavail:%d): base[%lx] size[%lx]\n", |
| 1149 | i, pavail[i].phys_addr, pavail[i].reg_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | #endif |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1151 | free_bootmem(pavail[i].phys_addr, pavail[i].reg_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | #ifdef CONFIG_BLK_DEV_INITRD |
| 1155 | if (initrd_start) { |
| 1156 | size = initrd_end - initrd_start; |
| 1157 | |
| 1158 | /* Resert the initrd image area. */ |
| 1159 | #ifdef CONFIG_DEBUG_BOOTMEM |
| 1160 | prom_printf("reserve_bootmem(initrd): base[%llx] size[%lx]\n", |
| 1161 | initrd_start, initrd_end); |
| 1162 | #endif |
| 1163 | reserve_bootmem(initrd_start, size); |
| 1164 | *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 1165 | |
| 1166 | initrd_start += PAGE_OFFSET; |
| 1167 | initrd_end += PAGE_OFFSET; |
| 1168 | } |
| 1169 | #endif |
| 1170 | /* Reserve the kernel text/data/bss. */ |
| 1171 | #ifdef CONFIG_DEBUG_BOOTMEM |
| 1172 | prom_printf("reserve_bootmem(kernel): base[%lx] size[%lx]\n", kern_base, kern_size); |
| 1173 | #endif |
| 1174 | reserve_bootmem(kern_base, kern_size); |
| 1175 | *pages_avail -= PAGE_ALIGN(kern_size) >> PAGE_SHIFT; |
| 1176 | |
| 1177 | /* Reserve the bootmem map. We do not account for it |
| 1178 | * in pages_avail because we will release that memory |
| 1179 | * in free_all_bootmem. |
| 1180 | */ |
| 1181 | size = bootmap_size; |
| 1182 | #ifdef CONFIG_DEBUG_BOOTMEM |
| 1183 | prom_printf("reserve_bootmem(bootmap): base[%lx] size[%lx]\n", |
| 1184 | (bootmap_pfn << PAGE_SHIFT), size); |
| 1185 | #endif |
| 1186 | reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size); |
| 1187 | *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 1188 | |
| 1189 | return end_pfn; |
| 1190 | } |
| 1191 | |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1192 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1193 | static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend, pgprot_t prot) |
| 1194 | { |
| 1195 | unsigned long vstart = PAGE_OFFSET + pstart; |
| 1196 | unsigned long vend = PAGE_OFFSET + pend; |
| 1197 | unsigned long alloc_bytes = 0UL; |
| 1198 | |
| 1199 | if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) { |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1200 | prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n", |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1201 | vstart, vend); |
| 1202 | prom_halt(); |
| 1203 | } |
| 1204 | |
| 1205 | while (vstart < vend) { |
| 1206 | unsigned long this_end, paddr = __pa(vstart); |
| 1207 | pgd_t *pgd = pgd_offset_k(vstart); |
| 1208 | pud_t *pud; |
| 1209 | pmd_t *pmd; |
| 1210 | pte_t *pte; |
| 1211 | |
| 1212 | pud = pud_offset(pgd, vstart); |
| 1213 | if (pud_none(*pud)) { |
| 1214 | pmd_t *new; |
| 1215 | |
| 1216 | new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE); |
| 1217 | alloc_bytes += PAGE_SIZE; |
| 1218 | pud_populate(&init_mm, pud, new); |
| 1219 | } |
| 1220 | |
| 1221 | pmd = pmd_offset(pud, vstart); |
| 1222 | if (!pmd_present(*pmd)) { |
| 1223 | pte_t *new; |
| 1224 | |
| 1225 | new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE); |
| 1226 | alloc_bytes += PAGE_SIZE; |
| 1227 | pmd_populate_kernel(&init_mm, pmd, new); |
| 1228 | } |
| 1229 | |
| 1230 | pte = pte_offset_kernel(pmd, vstart); |
| 1231 | this_end = (vstart + PMD_SIZE) & PMD_MASK; |
| 1232 | if (this_end > vend) |
| 1233 | this_end = vend; |
| 1234 | |
| 1235 | while (vstart < this_end) { |
| 1236 | pte_val(*pte) = (paddr | pgprot_val(prot)); |
| 1237 | |
| 1238 | vstart += PAGE_SIZE; |
| 1239 | paddr += PAGE_SIZE; |
| 1240 | pte++; |
| 1241 | } |
| 1242 | } |
| 1243 | |
| 1244 | return alloc_bytes; |
| 1245 | } |
| 1246 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1247 | static struct linux_prom64_registers pall[MAX_BANKS] __initdata; |
| 1248 | static int pall_ents __initdata; |
| 1249 | |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1250 | extern unsigned int kvmap_linear_patch[1]; |
| 1251 | |
| 1252 | static void __init kernel_physical_mapping_init(void) |
| 1253 | { |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1254 | unsigned long i, mem_alloced = 0UL; |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1255 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1256 | read_obp_memory("reg", &pall[0], &pall_ents); |
| 1257 | |
| 1258 | for (i = 0; i < pall_ents; i++) { |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1259 | unsigned long phys_start, phys_end; |
| 1260 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1261 | phys_start = pall[i].phys_addr; |
| 1262 | phys_end = phys_start + pall[i].reg_size; |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1263 | mem_alloced += kernel_map_range(phys_start, phys_end, |
| 1264 | PAGE_KERNEL); |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | printk("Allocated %ld bytes for kernel page tables.\n", |
| 1268 | mem_alloced); |
| 1269 | |
| 1270 | kvmap_linear_patch[0] = 0x01000000; /* nop */ |
| 1271 | flushi(&kvmap_linear_patch[0]); |
| 1272 | |
| 1273 | __flush_tlb_all(); |
| 1274 | } |
| 1275 | |
| 1276 | void kernel_map_pages(struct page *page, int numpages, int enable) |
| 1277 | { |
| 1278 | unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT; |
| 1279 | unsigned long phys_end = phys_start + (numpages * PAGE_SIZE); |
| 1280 | |
| 1281 | kernel_map_range(phys_start, phys_end, |
| 1282 | (enable ? PAGE_KERNEL : __pgprot(0))); |
| 1283 | |
David S. Miller | 74bf431 | 2006-01-31 18:29:18 -0800 | [diff] [blame] | 1284 | flush_tsb_kernel_range(PAGE_OFFSET + phys_start, |
| 1285 | PAGE_OFFSET + phys_end); |
| 1286 | |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1287 | /* we should perform an IPI and flush all tlbs, |
| 1288 | * but that can deadlock->flush only current cpu. |
| 1289 | */ |
| 1290 | __flush_tlb_kernel_range(PAGE_OFFSET + phys_start, |
| 1291 | PAGE_OFFSET + phys_end); |
| 1292 | } |
| 1293 | #endif |
| 1294 | |
David S. Miller | 1014757 | 2005-09-28 21:46:43 -0700 | [diff] [blame] | 1295 | unsigned long __init find_ecache_flush_span(unsigned long size) |
| 1296 | { |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1297 | int i; |
David S. Miller | 1014757 | 2005-09-28 21:46:43 -0700 | [diff] [blame] | 1298 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1299 | for (i = 0; i < pavail_ents; i++) { |
| 1300 | if (pavail[i].reg_size >= size) |
| 1301 | return pavail[i].phys_addr; |
David S. Miller | 1014757 | 2005-09-28 21:46:43 -0700 | [diff] [blame] | 1302 | } |
| 1303 | |
| 1304 | return ~0UL; |
| 1305 | } |
| 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | /* paging_init() sets up the page tables */ |
| 1308 | |
| 1309 | extern void cheetah_ecache_flush_init(void); |
| 1310 | |
| 1311 | static unsigned long last_valid_pfn; |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1312 | pgd_t swapper_pg_dir[2048]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
| 1314 | void __init paging_init(void) |
| 1315 | { |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1316 | unsigned long end_pfn, pages_avail, shift; |
David S. Miller | 0836a0e | 2005-09-28 21:38:08 -0700 | [diff] [blame] | 1317 | unsigned long real_end, i; |
| 1318 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1319 | /* Find available physical memory... */ |
| 1320 | read_obp_memory("available", &pavail[0], &pavail_ents); |
David S. Miller | 0836a0e | 2005-09-28 21:38:08 -0700 | [diff] [blame] | 1321 | |
| 1322 | phys_base = 0xffffffffffffffffUL; |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1323 | for (i = 0; i < pavail_ents; i++) |
| 1324 | phys_base = min(phys_base, pavail[i].phys_addr); |
David S. Miller | 0836a0e | 2005-09-28 21:38:08 -0700 | [diff] [blame] | 1325 | |
David S. Miller | 0836a0e | 2005-09-28 21:38:08 -0700 | [diff] [blame] | 1326 | pfn_base = phys_base >> PAGE_SHIFT; |
| 1327 | |
| 1328 | kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL; |
| 1329 | kern_size = (unsigned long)&_end - (unsigned long)KERNBASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
| 1331 | set_bit(0, mmu_context_bmap); |
| 1332 | |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1333 | shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE); |
| 1334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | real_end = (unsigned long)_end; |
| 1336 | if ((real_end > ((unsigned long)KERNBASE + 0x400000))) |
| 1337 | bigkernel = 1; |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1338 | if ((real_end > ((unsigned long)KERNBASE + 0x800000))) { |
| 1339 | prom_printf("paging_init: Kernel > 8MB, too large.\n"); |
| 1340 | prom_halt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | } |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1342 | |
| 1343 | /* Set kernel pgd to upper alias so physical page computations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | * work. |
| 1345 | */ |
| 1346 | init_mm.pgd += ((shift) / (sizeof(pgd_t))); |
| 1347 | |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1348 | memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
| 1350 | /* Now can init the kernel/bad page tables. */ |
| 1351 | pud_set(pud_offset(&swapper_pg_dir[0], 0), |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1352 | swapper_low_pmd_dir + (shift / sizeof(pgd_t))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1354 | swapper_pgd_zero = pgd_val(swapper_pg_dir[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 1356 | inherit_prom_mappings(); |
David S. Miller | 5085b4a | 2005-09-22 00:45:41 -0700 | [diff] [blame] | 1357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | /* Ok, we can use our TLB miss and window trap handlers safely. |
| 1359 | * We need to do a quick peek here to see if we are on StarFire |
| 1360 | * or not, so setup_tba can setup the IRQ globals correctly (it |
| 1361 | * needs to get the hard smp processor id correctly). |
| 1362 | */ |
| 1363 | { |
| 1364 | extern void setup_tba(int); |
| 1365 | setup_tba(this_is_starfire); |
| 1366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
David S. Miller | c9c1083 | 2005-10-12 12:22:46 -0700 | [diff] [blame] | 1368 | inherit_locked_prom_mappings(1); |
| 1369 | |
| 1370 | __flush_tlb_all(); |
David S. Miller | 9ad98c5 | 2005-10-05 15:12:00 -0700 | [diff] [blame] | 1371 | |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1372 | /* Setup bootmem... */ |
| 1373 | pages_avail = 0; |
| 1374 | last_valid_pfn = end_pfn = bootmem_init(&pages_avail); |
| 1375 | |
David S. Miller | 5642530 | 2005-09-25 16:46:57 -0700 | [diff] [blame] | 1376 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1377 | kernel_physical_mapping_init(); |
| 1378 | #endif |
| 1379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | { |
| 1381 | unsigned long zones_size[MAX_NR_ZONES]; |
| 1382 | unsigned long zholes_size[MAX_NR_ZONES]; |
| 1383 | unsigned long npages; |
| 1384 | int znum; |
| 1385 | |
| 1386 | for (znum = 0; znum < MAX_NR_ZONES; znum++) |
| 1387 | zones_size[znum] = zholes_size[znum] = 0; |
| 1388 | |
| 1389 | npages = end_pfn - pfn_base; |
| 1390 | zones_size[ZONE_DMA] = npages; |
| 1391 | zholes_size[ZONE_DMA] = npages - pages_avail; |
| 1392 | |
| 1393 | free_area_init_node(0, &contig_page_data, zones_size, |
| 1394 | phys_base >> PAGE_SHIFT, zholes_size); |
| 1395 | } |
| 1396 | |
| 1397 | device_scan(); |
| 1398 | } |
| 1399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | static void __init taint_real_pages(void) |
| 1401 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | int i; |
| 1403 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1404 | read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1406 | /* Find changes discovered in the physmem available rescan and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | * reserve the lost portions in the bootmem maps. |
| 1408 | */ |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1409 | for (i = 0; i < pavail_ents; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | unsigned long old_start, old_end; |
| 1411 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1412 | old_start = pavail[i].phys_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | old_end = old_start + |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1414 | pavail[i].reg_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | while (old_start < old_end) { |
| 1416 | int n; |
| 1417 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1418 | for (n = 0; pavail_rescan_ents; n++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | unsigned long new_start, new_end; |
| 1420 | |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1421 | new_start = pavail_rescan[n].phys_addr; |
| 1422 | new_end = new_start + |
| 1423 | pavail_rescan[n].reg_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
| 1425 | if (new_start <= old_start && |
| 1426 | new_end >= (old_start + PAGE_SIZE)) { |
David S. Miller | 13edad7 | 2005-09-29 17:58:26 -0700 | [diff] [blame] | 1427 | set_bit(old_start >> 22, |
| 1428 | sparc64_valid_addr_bitmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | goto do_next_page; |
| 1430 | } |
| 1431 | } |
| 1432 | reserve_bootmem(old_start, PAGE_SIZE); |
| 1433 | |
| 1434 | do_next_page: |
| 1435 | old_start += PAGE_SIZE; |
| 1436 | } |
| 1437 | } |
| 1438 | } |
| 1439 | |
| 1440 | void __init mem_init(void) |
| 1441 | { |
| 1442 | unsigned long codepages, datapages, initpages; |
| 1443 | unsigned long addr, last; |
| 1444 | int i; |
| 1445 | |
| 1446 | i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6); |
| 1447 | i += 1; |
David S. Miller | 2bdb3cb | 2005-09-22 01:08:57 -0700 | [diff] [blame] | 1448 | sparc64_valid_addr_bitmap = (unsigned long *) alloc_bootmem(i << 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | if (sparc64_valid_addr_bitmap == NULL) { |
| 1450 | prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); |
| 1451 | prom_halt(); |
| 1452 | } |
| 1453 | memset(sparc64_valid_addr_bitmap, 0, i << 3); |
| 1454 | |
| 1455 | addr = PAGE_OFFSET + kern_base; |
| 1456 | last = PAGE_ALIGN(kern_size) + addr; |
| 1457 | while (addr < last) { |
| 1458 | set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap); |
| 1459 | addr += PAGE_SIZE; |
| 1460 | } |
| 1461 | |
| 1462 | taint_real_pages(); |
| 1463 | |
| 1464 | max_mapnr = last_valid_pfn - pfn_base; |
| 1465 | high_memory = __va(last_valid_pfn << PAGE_SHIFT); |
| 1466 | |
| 1467 | #ifdef CONFIG_DEBUG_BOOTMEM |
| 1468 | prom_printf("mem_init: Calling free_all_bootmem().\n"); |
| 1469 | #endif |
| 1470 | totalram_pages = num_physpages = free_all_bootmem() - 1; |
| 1471 | |
| 1472 | /* |
| 1473 | * Set up the zero page, mark it reserved, so that page count |
| 1474 | * is not manipulated when freeing the page from user ptes. |
| 1475 | */ |
| 1476 | mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0); |
| 1477 | if (mem_map_zero == NULL) { |
| 1478 | prom_printf("paging_init: Cannot alloc zero page.\n"); |
| 1479 | prom_halt(); |
| 1480 | } |
| 1481 | SetPageReserved(mem_map_zero); |
| 1482 | |
| 1483 | codepages = (((unsigned long) _etext) - ((unsigned long) _start)); |
| 1484 | codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT; |
| 1485 | datapages = (((unsigned long) _edata) - ((unsigned long) _etext)); |
| 1486 | datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT; |
| 1487 | initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin)); |
| 1488 | initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT; |
| 1489 | |
| 1490 | printk("Memory: %uk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n", |
| 1491 | nr_free_pages() << (PAGE_SHIFT-10), |
| 1492 | codepages << (PAGE_SHIFT-10), |
| 1493 | datapages << (PAGE_SHIFT-10), |
| 1494 | initpages << (PAGE_SHIFT-10), |
| 1495 | PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT)); |
| 1496 | |
| 1497 | if (tlb_type == cheetah || tlb_type == cheetah_plus) |
| 1498 | cheetah_ecache_flush_init(); |
| 1499 | } |
| 1500 | |
David S. Miller | 898cf0e | 2005-09-23 11:59:44 -0700 | [diff] [blame] | 1501 | void free_initmem(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | { |
| 1503 | unsigned long addr, initend; |
| 1504 | |
| 1505 | /* |
| 1506 | * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes. |
| 1507 | */ |
| 1508 | addr = PAGE_ALIGN((unsigned long)(__init_begin)); |
| 1509 | initend = (unsigned long)(__init_end) & PAGE_MASK; |
| 1510 | for (; addr < initend; addr += PAGE_SIZE) { |
| 1511 | unsigned long page; |
| 1512 | struct page *p; |
| 1513 | |
| 1514 | page = (addr + |
| 1515 | ((unsigned long) __va(kern_base)) - |
| 1516 | ((unsigned long) KERNBASE)); |
| 1517 | memset((void *)addr, 0xcc, PAGE_SIZE); |
| 1518 | p = virt_to_page(page); |
| 1519 | |
| 1520 | ClearPageReserved(p); |
| 1521 | set_page_count(p, 1); |
| 1522 | __free_page(p); |
| 1523 | num_physpages++; |
| 1524 | totalram_pages++; |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | #ifdef CONFIG_BLK_DEV_INITRD |
| 1529 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 1530 | { |
| 1531 | if (start < end) |
| 1532 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
| 1533 | for (; start < end; start += PAGE_SIZE) { |
| 1534 | struct page *p = virt_to_page(start); |
| 1535 | |
| 1536 | ClearPageReserved(p); |
| 1537 | set_page_count(p, 1); |
| 1538 | __free_page(p); |
| 1539 | num_physpages++; |
| 1540 | totalram_pages++; |
| 1541 | } |
| 1542 | } |
| 1543 | #endif |