Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Based on arch/arm/mm/mmu.c |
| 3 | * |
| 4 | * Copyright (C) 1995-2005 Russell King |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/export.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/mman.h> |
| 25 | #include <linux/nodemask.h> |
| 26 | #include <linux/memblock.h> |
| 27 | #include <linux/fs.h> |
Catalin Marinas | 2475ff9 | 2012-10-23 14:55:08 +0100 | [diff] [blame] | 28 | #include <linux/io.h> |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 29 | #include <linux/slab.h> |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 30 | #include <linux/stop_machine.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 31 | |
| 32 | #include <asm/cputype.h> |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 33 | #include <asm/fixmap.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 34 | #include <asm/sections.h> |
| 35 | #include <asm/setup.h> |
| 36 | #include <asm/sizes.h> |
| 37 | #include <asm/tlb.h> |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 38 | #include <asm/memblock.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 39 | #include <asm/mmu_context.h> |
| 40 | |
| 41 | #include "mm.h" |
| 42 | |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame^] | 43 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
| 44 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 45 | /* |
| 46 | * Empty_zero_page is a special page that is used for zero-initialized data |
| 47 | * and COW. |
| 48 | */ |
| 49 | struct page *empty_zero_page; |
| 50 | EXPORT_SYMBOL(empty_zero_page); |
| 51 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 52 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| 53 | unsigned long size, pgprot_t vma_prot) |
| 54 | { |
| 55 | if (!pfn_valid(pfn)) |
| 56 | return pgprot_noncached(vma_prot); |
| 57 | else if (file->f_flags & O_SYNC) |
| 58 | return pgprot_writecombine(vma_prot); |
| 59 | return vma_prot; |
| 60 | } |
| 61 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 62 | |
| 63 | static void __init *early_alloc(unsigned long sz) |
| 64 | { |
| 65 | void *ptr = __va(memblock_alloc(sz, sz)); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 66 | BUG_ON(!ptr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 67 | memset(ptr, 0, sz); |
| 68 | return ptr; |
| 69 | } |
| 70 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 71 | /* |
| 72 | * remap a PMD into pages |
| 73 | */ |
| 74 | static void split_pmd(pmd_t *pmd, pte_t *pte) |
| 75 | { |
| 76 | unsigned long pfn = pmd_pfn(*pmd); |
| 77 | int i = 0; |
| 78 | |
| 79 | do { |
| 80 | /* |
| 81 | * Need to have the least restrictive permissions available |
| 82 | * permissions will be fixed up later |
| 83 | */ |
| 84 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
| 85 | pfn++; |
| 86 | } while (pte++, i++, i < PTRS_PER_PTE); |
| 87 | } |
| 88 | |
| 89 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 90 | unsigned long end, unsigned long pfn, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 91 | pgprot_t prot, |
| 92 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 93 | { |
| 94 | pte_t *pte; |
| 95 | |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 96 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 97 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
| 98 | if (pmd_sect(*pmd)) |
| 99 | split_pmd(pmd, pte); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 100 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 101 | flush_tlb_all(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 102 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 103 | BUG_ON(pmd_bad(*pmd)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 104 | |
| 105 | pte = pte_offset_kernel(pmd, addr); |
| 106 | do { |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 107 | set_pte(pte, pfn_pte(pfn, prot)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 108 | pfn++; |
| 109 | } while (pte++, addr += PAGE_SIZE, addr != end); |
| 110 | } |
| 111 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 112 | void split_pud(pud_t *old_pud, pmd_t *pmd) |
| 113 | { |
| 114 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; |
| 115 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); |
| 116 | int i = 0; |
| 117 | |
| 118 | do { |
| 119 | set_pmd(pmd, __pmd(addr | prot)); |
| 120 | addr += PMD_SIZE; |
| 121 | } while (pmd++, i++, i < PTRS_PER_PMD); |
| 122 | } |
| 123 | |
| 124 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 125 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 126 | phys_addr_t phys, pgprot_t prot, |
| 127 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 128 | { |
| 129 | pmd_t *pmd; |
| 130 | unsigned long next; |
| 131 | |
| 132 | /* |
| 133 | * Check for initial section mappings in the pgd/pud and remove them. |
| 134 | */ |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 135 | if (pud_none(*pud) || pud_sect(*pud)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 136 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
| 137 | if (pud_sect(*pud)) { |
| 138 | /* |
| 139 | * need to have the 1G of mappings continue to be |
| 140 | * present |
| 141 | */ |
| 142 | split_pud(pud, pmd); |
| 143 | } |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 144 | pud_populate(mm, pud, pmd); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 145 | flush_tlb_all(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 146 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 147 | BUG_ON(pud_bad(*pud)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 148 | |
| 149 | pmd = pmd_offset(pud, addr); |
| 150 | do { |
| 151 | next = pmd_addr_end(addr, end); |
| 152 | /* try section mapping first */ |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 153 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
| 154 | pmd_t old_pmd =*pmd; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 155 | set_pmd(pmd, __pmd(phys | |
| 156 | pgprot_val(mk_sect_prot(prot)))); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 157 | /* |
| 158 | * Check for previous table entries created during |
| 159 | * boot (__create_page_tables) and flush them. |
| 160 | */ |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 161 | if (!pmd_none(old_pmd)) { |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 162 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 163 | if (pmd_table(old_pmd)) { |
| 164 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 165 | if (!WARN_ON_ONCE(slab_is_available())) |
| 166 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 167 | } |
| 168 | } |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 169 | } else { |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 170 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 171 | prot, alloc); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 172 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 173 | phys += next - addr; |
| 174 | } while (pmd++, addr = next, addr != end); |
| 175 | } |
| 176 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 177 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
| 178 | unsigned long phys) |
| 179 | { |
| 180 | if (PAGE_SHIFT != 12) |
| 181 | return false; |
| 182 | |
| 183 | if (((addr | next | phys) & ~PUD_MASK) != 0) |
| 184 | return false; |
| 185 | |
| 186 | return true; |
| 187 | } |
| 188 | |
| 189 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 190 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 191 | phys_addr_t phys, pgprot_t prot, |
| 192 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 193 | { |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 194 | pud_t *pud; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 195 | unsigned long next; |
| 196 | |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 197 | if (pgd_none(*pgd)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 198 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 199 | pgd_populate(mm, pgd, pud); |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 200 | } |
| 201 | BUG_ON(pgd_bad(*pgd)); |
| 202 | |
| 203 | pud = pud_offset(pgd, addr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 204 | do { |
| 205 | next = pud_addr_end(addr, end); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 206 | |
| 207 | /* |
| 208 | * For 4K granule only, attempt to put down a 1GB block |
| 209 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 210 | if (use_1G_block(addr, next, phys)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 211 | pud_t old_pud = *pud; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 212 | set_pud(pud, __pud(phys | |
| 213 | pgprot_val(mk_sect_prot(prot)))); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 214 | |
| 215 | /* |
| 216 | * If we have an old value for a pud, it will |
| 217 | * be pointing to a pmd table that we no longer |
| 218 | * need (from swapper_pg_dir). |
| 219 | * |
| 220 | * Look up the old pmd table and free it. |
| 221 | */ |
| 222 | if (!pud_none(old_pud)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 223 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 224 | if (pud_table(old_pud)) { |
| 225 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 226 | if (!WARN_ON_ONCE(slab_is_available())) |
| 227 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 228 | } |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 229 | } |
| 230 | } else { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 231 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 232 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 233 | phys += next - addr; |
| 234 | } while (pud++, addr = next, addr != end); |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Create the page directory entries and any necessary page tables for the |
| 239 | * mapping specified by 'md'. |
| 240 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 241 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 242 | phys_addr_t phys, unsigned long virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 243 | phys_addr_t size, pgprot_t prot, |
| 244 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 245 | { |
| 246 | unsigned long addr, length, end, next; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 247 | |
| 248 | addr = virt & PAGE_MASK; |
| 249 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); |
| 250 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 251 | end = addr + length; |
| 252 | do { |
| 253 | next = pgd_addr_end(addr, end); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 254 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 255 | phys += next - addr; |
| 256 | } while (pgd++, addr = next, addr != end); |
| 257 | } |
| 258 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 259 | static void *late_alloc(unsigned long size) |
| 260 | { |
| 261 | void *ptr; |
| 262 | |
| 263 | BUG_ON(size > PAGE_SIZE); |
| 264 | ptr = (void *)__get_free_page(PGALLOC_GFP); |
| 265 | BUG_ON(!ptr); |
| 266 | return ptr; |
| 267 | } |
| 268 | |
| 269 | static void __ref create_mapping(phys_addr_t phys, unsigned long virt, |
| 270 | phys_addr_t size, pgprot_t prot) |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 271 | { |
| 272 | if (virt < VMALLOC_START) { |
| 273 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 274 | &phys, virt); |
| 275 | return; |
| 276 | } |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 277 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 278 | size, prot, early_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 279 | } |
| 280 | |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 281 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
| 282 | unsigned long virt, phys_addr_t size, |
| 283 | pgprot_t prot) |
| 284 | { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 285 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
Ard Biesheuvel | 60305db | 2015-01-22 10:01:40 +0000 | [diff] [blame] | 286 | late_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 287 | } |
| 288 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 289 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
| 290 | phys_addr_t size, pgprot_t prot) |
| 291 | { |
| 292 | if (virt < VMALLOC_START) { |
| 293 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 294 | &phys, virt); |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), |
| 299 | phys, virt, size, prot, late_alloc); |
| 300 | } |
| 301 | |
| 302 | #ifdef CONFIG_DEBUG_RODATA |
| 303 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 304 | { |
| 305 | /* |
| 306 | * Set up the executable regions using the existing section mappings |
| 307 | * for now. This will get more fine grained later once all memory |
| 308 | * is mapped |
| 309 | */ |
| 310 | unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE); |
| 311 | unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE); |
| 312 | |
| 313 | if (end < kernel_x_start) { |
| 314 | create_mapping(start, __phys_to_virt(start), |
| 315 | end - start, PAGE_KERNEL); |
| 316 | } else if (start >= kernel_x_end) { |
| 317 | create_mapping(start, __phys_to_virt(start), |
| 318 | end - start, PAGE_KERNEL); |
| 319 | } else { |
| 320 | if (start < kernel_x_start) |
| 321 | create_mapping(start, __phys_to_virt(start), |
| 322 | kernel_x_start - start, |
| 323 | PAGE_KERNEL); |
| 324 | create_mapping(kernel_x_start, |
| 325 | __phys_to_virt(kernel_x_start), |
| 326 | kernel_x_end - kernel_x_start, |
| 327 | PAGE_KERNEL_EXEC); |
| 328 | if (kernel_x_end < end) |
| 329 | create_mapping(kernel_x_end, |
| 330 | __phys_to_virt(kernel_x_end), |
| 331 | end - kernel_x_end, |
| 332 | PAGE_KERNEL); |
| 333 | } |
| 334 | |
| 335 | } |
| 336 | #else |
| 337 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 338 | { |
| 339 | create_mapping(start, __phys_to_virt(start), end - start, |
| 340 | PAGE_KERNEL_EXEC); |
| 341 | } |
| 342 | #endif |
| 343 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 344 | static void __init map_mem(void) |
| 345 | { |
| 346 | struct memblock_region *reg; |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 347 | phys_addr_t limit; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 348 | |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 349 | /* |
| 350 | * Temporarily limit the memblock range. We need to do this as |
| 351 | * create_mapping requires puds, pmds and ptes to be allocated from |
| 352 | * memory addressable from the initial direct kernel mapping. |
| 353 | * |
Catalin Marinas | 3dec0fe | 2014-10-24 18:16:47 +0100 | [diff] [blame] | 354 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
| 355 | * us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from |
| 356 | * PHYS_OFFSET (which must be aligned to 2MB as per |
| 357 | * Documentation/arm64/booting.txt). |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 358 | */ |
Catalin Marinas | 3dec0fe | 2014-10-24 18:16:47 +0100 | [diff] [blame] | 359 | if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) |
| 360 | limit = PHYS_OFFSET + PMD_SIZE; |
| 361 | else |
| 362 | limit = PHYS_OFFSET + PUD_SIZE; |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 363 | memblock_set_current_limit(limit); |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 364 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 365 | /* map all the memory banks */ |
| 366 | for_each_memblock(memory, reg) { |
| 367 | phys_addr_t start = reg->base; |
| 368 | phys_addr_t end = start + reg->size; |
| 369 | |
| 370 | if (start >= end) |
| 371 | break; |
| 372 | |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 373 | #ifndef CONFIG_ARM64_64K_PAGES |
| 374 | /* |
| 375 | * For the first memory bank align the start address and |
| 376 | * current memblock limit to prevent create_mapping() from |
| 377 | * allocating pte page tables from unmapped memory. |
| 378 | * When 64K pages are enabled, the pte page table for the |
| 379 | * first PGDIR_SIZE is already present in swapper_pg_dir. |
| 380 | */ |
| 381 | if (start < limit) |
| 382 | start = ALIGN(start, PMD_SIZE); |
| 383 | if (end < limit) { |
| 384 | limit = end & PMD_MASK; |
| 385 | memblock_set_current_limit(limit); |
| 386 | } |
| 387 | #endif |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 388 | __map_memblock(start, end); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 389 | } |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 390 | |
| 391 | /* Limit no longer required. */ |
| 392 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 393 | } |
| 394 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 395 | void __init fixup_executable(void) |
| 396 | { |
| 397 | #ifdef CONFIG_DEBUG_RODATA |
| 398 | /* now that we are actually fully mapped, make the start/end more fine grained */ |
| 399 | if (!IS_ALIGNED((unsigned long)_stext, SECTION_SIZE)) { |
| 400 | unsigned long aligned_start = round_down(__pa(_stext), |
| 401 | SECTION_SIZE); |
| 402 | |
| 403 | create_mapping(aligned_start, __phys_to_virt(aligned_start), |
| 404 | __pa(_stext) - aligned_start, |
| 405 | PAGE_KERNEL); |
| 406 | } |
| 407 | |
| 408 | if (!IS_ALIGNED((unsigned long)__init_end, SECTION_SIZE)) { |
| 409 | unsigned long aligned_end = round_up(__pa(__init_end), |
| 410 | SECTION_SIZE); |
| 411 | create_mapping(__pa(__init_end), (unsigned long)__init_end, |
| 412 | aligned_end - __pa(__init_end), |
| 413 | PAGE_KERNEL); |
| 414 | } |
| 415 | #endif |
| 416 | } |
| 417 | |
| 418 | #ifdef CONFIG_DEBUG_RODATA |
| 419 | void mark_rodata_ro(void) |
| 420 | { |
| 421 | create_mapping_late(__pa(_stext), (unsigned long)_stext, |
| 422 | (unsigned long)_etext - (unsigned long)_stext, |
| 423 | PAGE_KERNEL_EXEC | PTE_RDONLY); |
| 424 | |
| 425 | } |
| 426 | #endif |
| 427 | |
| 428 | void fixup_init(void) |
| 429 | { |
| 430 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, |
| 431 | (unsigned long)__init_end - (unsigned long)__init_begin, |
| 432 | PAGE_KERNEL); |
| 433 | } |
| 434 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 435 | /* |
| 436 | * paging_init() sets up the page tables, initialises the zone memory |
| 437 | * maps and sets up the zero page. |
| 438 | */ |
| 439 | void __init paging_init(void) |
| 440 | { |
| 441 | void *zero_page; |
| 442 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 443 | map_mem(); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 444 | fixup_executable(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 445 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 446 | /* allocate the zero page. */ |
| 447 | zero_page = early_alloc(PAGE_SIZE); |
| 448 | |
| 449 | bootmem_init(); |
| 450 | |
| 451 | empty_zero_page = virt_to_page(zero_page); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 452 | |
| 453 | /* |
| 454 | * TTBR0 is only used for the identity mapping at this stage. Make it |
| 455 | * point to zero page to avoid speculatively fetching new entries. |
| 456 | */ |
| 457 | cpu_set_reserved_ttbr0(); |
| 458 | flush_tlb_all(); |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame^] | 459 | cpu_set_default_tcr_t0sz(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Enable the identity mapping to allow the MMU disabling. |
| 464 | */ |
| 465 | void setup_mm_for_reboot(void) |
| 466 | { |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame^] | 467 | cpu_set_reserved_ttbr0(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 468 | flush_tlb_all(); |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame^] | 469 | cpu_set_idmap_tcr_t0sz(); |
| 470 | cpu_switch_mm(idmap_pg_dir, &init_mm); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | /* |
| 474 | * Check whether a kernel address is valid (derived from arch/x86/). |
| 475 | */ |
| 476 | int kern_addr_valid(unsigned long addr) |
| 477 | { |
| 478 | pgd_t *pgd; |
| 479 | pud_t *pud; |
| 480 | pmd_t *pmd; |
| 481 | pte_t *pte; |
| 482 | |
| 483 | if ((((long)addr) >> VA_BITS) != -1UL) |
| 484 | return 0; |
| 485 | |
| 486 | pgd = pgd_offset_k(addr); |
| 487 | if (pgd_none(*pgd)) |
| 488 | return 0; |
| 489 | |
| 490 | pud = pud_offset(pgd, addr); |
| 491 | if (pud_none(*pud)) |
| 492 | return 0; |
| 493 | |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 494 | if (pud_sect(*pud)) |
| 495 | return pfn_valid(pud_pfn(*pud)); |
| 496 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 497 | pmd = pmd_offset(pud, addr); |
| 498 | if (pmd_none(*pmd)) |
| 499 | return 0; |
| 500 | |
Dave Anderson | da6e4cb | 2014-04-15 18:53:24 +0100 | [diff] [blame] | 501 | if (pmd_sect(*pmd)) |
| 502 | return pfn_valid(pmd_pfn(*pmd)); |
| 503 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 504 | pte = pte_offset_kernel(pmd, addr); |
| 505 | if (pte_none(*pte)) |
| 506 | return 0; |
| 507 | |
| 508 | return pfn_valid(pte_pfn(*pte)); |
| 509 | } |
| 510 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 511 | #ifdef CONFIG_ARM64_64K_PAGES |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 512 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 513 | { |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 514 | return vmemmap_populate_basepages(start, end, node); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 515 | } |
| 516 | #else /* !CONFIG_ARM64_64K_PAGES */ |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 517 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 518 | { |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 519 | unsigned long addr = start; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 520 | unsigned long next; |
| 521 | pgd_t *pgd; |
| 522 | pud_t *pud; |
| 523 | pmd_t *pmd; |
| 524 | |
| 525 | do { |
| 526 | next = pmd_addr_end(addr, end); |
| 527 | |
| 528 | pgd = vmemmap_pgd_populate(addr, node); |
| 529 | if (!pgd) |
| 530 | return -ENOMEM; |
| 531 | |
| 532 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 533 | if (!pud) |
| 534 | return -ENOMEM; |
| 535 | |
| 536 | pmd = pmd_offset(pud, addr); |
| 537 | if (pmd_none(*pmd)) { |
| 538 | void *p = NULL; |
| 539 | |
| 540 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
| 541 | if (!p) |
| 542 | return -ENOMEM; |
| 543 | |
Catalin Marinas | a501e32 | 2014-04-03 15:57:15 +0100 | [diff] [blame] | 544 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 545 | } else |
| 546 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
| 547 | } while (addr = next, addr != end); |
| 548 | |
| 549 | return 0; |
| 550 | } |
| 551 | #endif /* CONFIG_ARM64_64K_PAGES */ |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 552 | void vmemmap_free(unsigned long start, unsigned long end) |
Tang Chen | 0197518 | 2013-02-22 16:33:08 -0800 | [diff] [blame] | 553 | { |
| 554 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 555 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 556 | |
| 557 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
| 558 | #if CONFIG_ARM64_PGTABLE_LEVELS > 2 |
| 559 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
| 560 | #endif |
| 561 | #if CONFIG_ARM64_PGTABLE_LEVELS > 3 |
| 562 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
| 563 | #endif |
| 564 | |
| 565 | static inline pud_t * fixmap_pud(unsigned long addr) |
| 566 | { |
| 567 | pgd_t *pgd = pgd_offset_k(addr); |
| 568 | |
| 569 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); |
| 570 | |
| 571 | return pud_offset(pgd, addr); |
| 572 | } |
| 573 | |
| 574 | static inline pmd_t * fixmap_pmd(unsigned long addr) |
| 575 | { |
| 576 | pud_t *pud = fixmap_pud(addr); |
| 577 | |
| 578 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); |
| 579 | |
| 580 | return pmd_offset(pud, addr); |
| 581 | } |
| 582 | |
| 583 | static inline pte_t * fixmap_pte(unsigned long addr) |
| 584 | { |
| 585 | pmd_t *pmd = fixmap_pmd(addr); |
| 586 | |
| 587 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); |
| 588 | |
| 589 | return pte_offset_kernel(pmd, addr); |
| 590 | } |
| 591 | |
| 592 | void __init early_fixmap_init(void) |
| 593 | { |
| 594 | pgd_t *pgd; |
| 595 | pud_t *pud; |
| 596 | pmd_t *pmd; |
| 597 | unsigned long addr = FIXADDR_START; |
| 598 | |
| 599 | pgd = pgd_offset_k(addr); |
| 600 | pgd_populate(&init_mm, pgd, bm_pud); |
| 601 | pud = pud_offset(pgd, addr); |
| 602 | pud_populate(&init_mm, pud, bm_pmd); |
| 603 | pmd = pmd_offset(pud, addr); |
| 604 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
| 605 | |
| 606 | /* |
| 607 | * The boot-ioremap range spans multiple pmds, for which |
| 608 | * we are not preparted: |
| 609 | */ |
| 610 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) |
| 611 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); |
| 612 | |
| 613 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) |
| 614 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
| 615 | WARN_ON(1); |
| 616 | pr_warn("pmd %p != %p, %p\n", |
| 617 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), |
| 618 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); |
| 619 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
| 620 | fix_to_virt(FIX_BTMAP_BEGIN)); |
| 621 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", |
| 622 | fix_to_virt(FIX_BTMAP_END)); |
| 623 | |
| 624 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); |
| 625 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | void __set_fixmap(enum fixed_addresses idx, |
| 630 | phys_addr_t phys, pgprot_t flags) |
| 631 | { |
| 632 | unsigned long addr = __fix_to_virt(idx); |
| 633 | pte_t *pte; |
| 634 | |
Mark Rutland | b63dbef | 2015-03-04 13:27:35 +0000 | [diff] [blame] | 635 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 636 | |
| 637 | pte = fixmap_pte(addr); |
| 638 | |
| 639 | if (pgprot_val(flags)) { |
| 640 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
| 641 | } else { |
| 642 | pte_clear(&init_mm, addr, pte); |
| 643 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); |
| 644 | } |
| 645 | } |