Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/mm/init.c |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
| 7 | * |
| 8 | * Derived from "arch/i386/mm/init.c" |
| 9 | * Copyright (C) 1995 Linus Torvalds |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/signal.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/ptrace.h> |
| 20 | #include <linux/mman.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/swap.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/pagemap.h> |
| 26 | #include <linux/bootmem.h> |
| 27 | |
| 28 | #include <asm/processor.h> |
| 29 | #include <asm/system.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/pgtable.h> |
| 32 | #include <asm/pgalloc.h> |
| 33 | #include <asm/dma.h> |
| 34 | #include <asm/lowcore.h> |
| 35 | #include <asm/tlb.h> |
| 36 | #include <asm/tlbflush.h> |
| 37 | |
| 38 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 39 | |
| 40 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); |
| 41 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); |
| 42 | |
| 43 | void diag10(unsigned long addr) |
| 44 | { |
| 45 | if (addr >= 0x7ff00000) |
| 46 | return; |
| 47 | #ifdef __s390x__ |
| 48 | asm volatile ( |
| 49 | " sam31\n" |
| 50 | " diag %0,%0,0x10\n" |
| 51 | "0: sam64\n" |
| 52 | ".section __ex_table,\"a\"\n" |
| 53 | " .align 8\n" |
| 54 | " .quad 0b, 0b\n" |
| 55 | ".previous\n" |
| 56 | : : "a" (addr)); |
| 57 | #else |
| 58 | asm volatile ( |
| 59 | " diag %0,%0,0x10\n" |
| 60 | "0:\n" |
| 61 | ".section __ex_table,\"a\"\n" |
| 62 | " .align 4\n" |
| 63 | " .long 0b, 0b\n" |
| 64 | ".previous\n" |
| 65 | : : "a" (addr)); |
| 66 | #endif |
| 67 | } |
| 68 | |
| 69 | void show_mem(void) |
| 70 | { |
| 71 | int i, total = 0, reserved = 0; |
| 72 | int shared = 0, cached = 0; |
| 73 | |
| 74 | printk("Mem-info:\n"); |
| 75 | show_free_areas(); |
| 76 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 77 | i = max_mapnr; |
| 78 | while (i-- > 0) { |
| 79 | total++; |
| 80 | if (PageReserved(mem_map+i)) |
| 81 | reserved++; |
| 82 | else if (PageSwapCache(mem_map+i)) |
| 83 | cached++; |
| 84 | else if (page_count(mem_map+i)) |
| 85 | shared += page_count(mem_map+i) - 1; |
| 86 | } |
| 87 | printk("%d pages of RAM\n",total); |
| 88 | printk("%d reserved pages\n",reserved); |
| 89 | printk("%d pages shared\n",shared); |
| 90 | printk("%d pages swap cached\n",cached); |
| 91 | } |
| 92 | |
| 93 | /* References to section boundaries */ |
| 94 | |
| 95 | extern unsigned long _text; |
| 96 | extern unsigned long _etext; |
| 97 | extern unsigned long _edata; |
| 98 | extern unsigned long __bss_start; |
| 99 | extern unsigned long _end; |
| 100 | |
| 101 | extern unsigned long __init_begin; |
| 102 | extern unsigned long __init_end; |
| 103 | |
| 104 | /* |
| 105 | * paging_init() sets up the page tables |
| 106 | */ |
| 107 | |
| 108 | #ifndef CONFIG_ARCH_S390X |
| 109 | void __init paging_init(void) |
| 110 | { |
| 111 | pgd_t * pg_dir; |
| 112 | pte_t * pg_table; |
| 113 | pte_t pte; |
| 114 | int i; |
| 115 | unsigned long tmp; |
| 116 | unsigned long pfn = 0; |
| 117 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; |
| 118 | static const int ssm_mask = 0x04000000L; |
| 119 | |
| 120 | /* unmap whole virtual address space */ |
| 121 | |
| 122 | pg_dir = swapper_pg_dir; |
| 123 | |
| 124 | for (i=0;i<KERNEL_PGD_PTRS;i++) |
| 125 | pmd_clear((pmd_t*)pg_dir++); |
| 126 | |
| 127 | /* |
| 128 | * map whole physical memory to virtual memory (identity mapping) |
| 129 | */ |
| 130 | |
| 131 | pg_dir = swapper_pg_dir; |
| 132 | |
| 133 | while (pfn < max_low_pfn) { |
| 134 | /* |
| 135 | * pg_table is physical at this point |
| 136 | */ |
| 137 | pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); |
| 138 | |
| 139 | pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); |
| 140 | pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); |
| 141 | pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); |
| 142 | pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); |
| 143 | pg_dir++; |
| 144 | |
| 145 | for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { |
| 146 | pte = pfn_pte(pfn, PAGE_KERNEL); |
| 147 | if (pfn >= max_low_pfn) |
| 148 | pte_clear(&init_mm, 0, &pte); |
| 149 | set_pte(pg_table, pte); |
| 150 | pfn++; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | S390_lowcore.kernel_asce = pgdir_k; |
| 155 | |
| 156 | /* enable virtual mapping in kernel mode */ |
| 157 | __asm__ __volatile__(" LCTL 1,1,%0\n" |
| 158 | " LCTL 7,7,%0\n" |
| 159 | " LCTL 13,13,%0\n" |
| 160 | " SSM %1" |
| 161 | : : "m" (pgdir_k), "m" (ssm_mask)); |
| 162 | |
| 163 | local_flush_tlb(); |
| 164 | |
| 165 | { |
| 166 | unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0}; |
| 167 | |
| 168 | zones_size[ZONE_DMA] = max_low_pfn; |
| 169 | free_area_init(zones_size); |
| 170 | } |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | #else /* CONFIG_ARCH_S390X */ |
| 175 | void __init paging_init(void) |
| 176 | { |
| 177 | pgd_t * pg_dir; |
| 178 | pmd_t * pm_dir; |
| 179 | pte_t * pt_dir; |
| 180 | pte_t pte; |
| 181 | int i,j,k; |
| 182 | unsigned long pfn = 0; |
| 183 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | |
| 184 | _KERN_REGION_TABLE; |
| 185 | static const int ssm_mask = 0x04000000L; |
| 186 | |
| 187 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; |
| 188 | unsigned long dma_pfn, high_pfn; |
| 189 | |
| 190 | dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; |
| 191 | high_pfn = max_low_pfn; |
| 192 | |
| 193 | if (dma_pfn > high_pfn) |
| 194 | zones_size[ZONE_DMA] = high_pfn; |
| 195 | else { |
| 196 | zones_size[ZONE_DMA] = dma_pfn; |
| 197 | zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; |
| 198 | } |
| 199 | |
| 200 | /* Initialize mem_map[]. */ |
| 201 | free_area_init(zones_size); |
| 202 | |
| 203 | |
| 204 | /* |
| 205 | * map whole physical memory to virtual memory (identity mapping) |
| 206 | */ |
| 207 | |
| 208 | pg_dir = swapper_pg_dir; |
| 209 | |
| 210 | for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { |
| 211 | |
| 212 | if (pfn >= max_low_pfn) { |
| 213 | pgd_clear(pg_dir); |
| 214 | continue; |
| 215 | } |
| 216 | |
| 217 | pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4); |
| 218 | pgd_populate(&init_mm, pg_dir, pm_dir); |
| 219 | |
| 220 | for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { |
| 221 | if (pfn >= max_low_pfn) { |
| 222 | pmd_clear(pm_dir); |
| 223 | continue; |
| 224 | } |
| 225 | |
| 226 | pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); |
| 227 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); |
| 228 | |
| 229 | for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { |
| 230 | pte = pfn_pte(pfn, PAGE_KERNEL); |
| 231 | if (pfn >= max_low_pfn) { |
| 232 | pte_clear(&init_mm, 0, &pte); |
| 233 | continue; |
| 234 | } |
| 235 | set_pte(pt_dir, pte); |
| 236 | pfn++; |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | S390_lowcore.kernel_asce = pgdir_k; |
| 242 | |
| 243 | /* enable virtual mapping in kernel mode */ |
| 244 | __asm__ __volatile__("lctlg 1,1,%0\n\t" |
| 245 | "lctlg 7,7,%0\n\t" |
| 246 | "lctlg 13,13,%0\n\t" |
| 247 | "ssm %1" |
| 248 | : :"m" (pgdir_k), "m" (ssm_mask)); |
| 249 | |
| 250 | local_flush_tlb(); |
| 251 | |
| 252 | return; |
| 253 | } |
| 254 | #endif /* CONFIG_ARCH_S390X */ |
| 255 | |
| 256 | void __init mem_init(void) |
| 257 | { |
| 258 | unsigned long codesize, reservedpages, datasize, initsize; |
| 259 | |
| 260 | max_mapnr = num_physpages = max_low_pfn; |
| 261 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
| 262 | |
| 263 | /* clear the zero-page */ |
| 264 | memset(empty_zero_page, 0, PAGE_SIZE); |
| 265 | |
| 266 | /* this will put all low memory onto the freelists */ |
| 267 | totalram_pages += free_all_bootmem(); |
| 268 | |
| 269 | reservedpages = 0; |
| 270 | |
| 271 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 272 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 273 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 274 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
| 275 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 276 | max_mapnr << (PAGE_SHIFT-10), |
| 277 | codesize >> 10, |
| 278 | reservedpages << (PAGE_SHIFT-10), |
| 279 | datasize >>10, |
| 280 | initsize >> 10); |
| 281 | } |
| 282 | |
| 283 | void free_initmem(void) |
| 284 | { |
| 285 | unsigned long addr; |
| 286 | |
| 287 | addr = (unsigned long)(&__init_begin); |
| 288 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { |
| 289 | ClearPageReserved(virt_to_page(addr)); |
| 290 | set_page_count(virt_to_page(addr), 1); |
| 291 | free_page(addr); |
| 292 | totalram_pages++; |
| 293 | } |
| 294 | printk ("Freeing unused kernel memory: %ldk freed\n", |
| 295 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); |
| 296 | } |
| 297 | |
| 298 | #ifdef CONFIG_BLK_DEV_INITRD |
| 299 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 300 | { |
| 301 | if (start < end) |
| 302 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
| 303 | for (; start < end; start += PAGE_SIZE) { |
| 304 | ClearPageReserved(virt_to_page(start)); |
| 305 | set_page_count(virt_to_page(start), 1); |
| 306 | free_page(start); |
| 307 | totalram_pages++; |
| 308 | } |
| 309 | } |
| 310 | #endif |