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> |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 24 | #include <linux/libfdt.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 25 | #include <linux/mman.h> |
| 26 | #include <linux/nodemask.h> |
| 27 | #include <linux/memblock.h> |
| 28 | #include <linux/fs.h> |
Catalin Marinas | 2475ff9 | 2012-10-23 14:55:08 +0100 | [diff] [blame] | 29 | #include <linux/io.h> |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 30 | #include <linux/slab.h> |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 31 | #include <linux/stop_machine.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 32 | |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 33 | #include <asm/barrier.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 34 | #include <asm/cputype.h> |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 35 | #include <asm/fixmap.h> |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 36 | #include <asm/kernel-pgtable.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 37 | #include <asm/sections.h> |
| 38 | #include <asm/setup.h> |
| 39 | #include <asm/sizes.h> |
| 40 | #include <asm/tlb.h> |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 41 | #include <asm/memblock.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 42 | #include <asm/mmu_context.h> |
| 43 | |
| 44 | #include "mm.h" |
| 45 | |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame] | 46 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
| 47 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 48 | /* |
| 49 | * Empty_zero_page is a special page that is used for zero-initialized data |
| 50 | * and COW. |
| 51 | */ |
Mark Rutland | 5227cfa | 2016-01-25 11:44:57 +0000 | [diff] [blame] | 52 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 53 | EXPORT_SYMBOL(empty_zero_page); |
| 54 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 55 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| 56 | unsigned long size, pgprot_t vma_prot) |
| 57 | { |
| 58 | if (!pfn_valid(pfn)) |
| 59 | return pgprot_noncached(vma_prot); |
| 60 | else if (file->f_flags & O_SYNC) |
| 61 | return pgprot_writecombine(vma_prot); |
| 62 | return vma_prot; |
| 63 | } |
| 64 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 65 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 66 | static phys_addr_t __init early_pgtable_alloc(void) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 67 | { |
Suzuki K. Poulose | 7142392 | 2015-11-20 17:45:40 +0000 | [diff] [blame] | 68 | phys_addr_t phys; |
| 69 | void *ptr; |
| 70 | |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 71 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
Suzuki K. Poulose | 7142392 | 2015-11-20 17:45:40 +0000 | [diff] [blame] | 72 | BUG_ON(!phys); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 73 | |
| 74 | /* |
| 75 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE |
| 76 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise |
| 77 | * any level of table. |
| 78 | */ |
| 79 | ptr = pte_set_fixmap(phys); |
| 80 | |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 81 | memset(ptr, 0, PAGE_SIZE); |
| 82 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 83 | /* |
| 84 | * Implicit barriers also ensure the zeroed page is visible to the page |
| 85 | * table walker |
| 86 | */ |
| 87 | pte_clear_fixmap(); |
| 88 | |
| 89 | return phys; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 90 | } |
| 91 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 92 | /* |
| 93 | * remap a PMD into pages |
| 94 | */ |
| 95 | static void split_pmd(pmd_t *pmd, pte_t *pte) |
| 96 | { |
| 97 | unsigned long pfn = pmd_pfn(*pmd); |
| 98 | int i = 0; |
| 99 | |
| 100 | do { |
| 101 | /* |
| 102 | * Need to have the least restrictive permissions available |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 103 | * permissions will be fixed up later |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 104 | */ |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 105 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 106 | pfn++; |
| 107 | } while (pte++, i++, i < PTRS_PER_PTE); |
| 108 | } |
| 109 | |
| 110 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 111 | unsigned long end, unsigned long pfn, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 112 | pgprot_t prot, |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 113 | phys_addr_t (*pgtable_alloc)(void)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 114 | { |
| 115 | pte_t *pte; |
| 116 | |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 117 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 118 | phys_addr_t pte_phys = pgtable_alloc(); |
| 119 | pte = pte_set_fixmap(pte_phys); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 120 | if (pmd_sect(*pmd)) |
| 121 | split_pmd(pmd, pte); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 122 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 123 | flush_tlb_all(); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 124 | pte_clear_fixmap(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 125 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 126 | BUG_ON(pmd_bad(*pmd)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 127 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 128 | pte = pte_set_fixmap_offset(pmd, addr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 129 | do { |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 130 | set_pte(pte, pfn_pte(pfn, prot)); |
| 131 | pfn++; |
| 132 | } while (pte++, addr += PAGE_SIZE, addr != end); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 133 | |
| 134 | pte_clear_fixmap(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 135 | } |
| 136 | |
Jisheng Zhang | 9a17a21 | 2015-11-12 20:04:43 +0800 | [diff] [blame] | 137 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 138 | { |
| 139 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; |
| 140 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); |
| 141 | int i = 0; |
| 142 | |
| 143 | do { |
Ard Biesheuvel | 1e43ba9 | 2015-06-30 18:04:49 +0200 | [diff] [blame] | 144 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 145 | addr += PMD_SIZE; |
| 146 | } while (pmd++, i++, i < PTRS_PER_PMD); |
| 147 | } |
| 148 | |
| 149 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 150 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 151 | phys_addr_t phys, pgprot_t prot, |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 152 | phys_addr_t (*pgtable_alloc)(void)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 153 | { |
| 154 | pmd_t *pmd; |
| 155 | unsigned long next; |
| 156 | |
| 157 | /* |
| 158 | * Check for initial section mappings in the pgd/pud and remove them. |
| 159 | */ |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 160 | if (pud_none(*pud) || pud_sect(*pud)) { |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 161 | phys_addr_t pmd_phys = pgtable_alloc(); |
| 162 | pmd = pmd_set_fixmap(pmd_phys); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 163 | if (pud_sect(*pud)) { |
| 164 | /* |
| 165 | * need to have the 1G of mappings continue to be |
| 166 | * present |
| 167 | */ |
| 168 | split_pud(pud, pmd); |
| 169 | } |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 170 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 171 | flush_tlb_all(); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 172 | pmd_clear_fixmap(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 173 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 174 | BUG_ON(pud_bad(*pud)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 175 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 176 | pmd = pmd_set_fixmap_offset(pud, addr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 177 | do { |
| 178 | next = pmd_addr_end(addr, end); |
| 179 | /* try section mapping first */ |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 180 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
| 181 | pmd_t old_pmd =*pmd; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 182 | set_pmd(pmd, __pmd(phys | |
| 183 | pgprot_val(mk_sect_prot(prot)))); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 184 | /* |
| 185 | * Check for previous table entries created during |
| 186 | * boot (__create_page_tables) and flush them. |
| 187 | */ |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 188 | if (!pmd_none(old_pmd)) { |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 189 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 190 | if (pmd_table(old_pmd)) { |
Mark Rutland | 316b39db | 2016-01-25 11:45:05 +0000 | [diff] [blame] | 191 | phys_addr_t table = pmd_page_paddr(old_pmd); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 192 | if (!WARN_ON_ONCE(slab_is_available())) |
| 193 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 194 | } |
| 195 | } |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 196 | } else { |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 197 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 198 | prot, pgtable_alloc); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 199 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 200 | phys += next - addr; |
| 201 | } while (pmd++, addr = next, addr != end); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 202 | |
| 203 | pmd_clear_fixmap(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 204 | } |
| 205 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 206 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
| 207 | unsigned long phys) |
| 208 | { |
| 209 | if (PAGE_SHIFT != 12) |
| 210 | return false; |
| 211 | |
| 212 | if (((addr | next | phys) & ~PUD_MASK) != 0) |
| 213 | return false; |
| 214 | |
| 215 | return true; |
| 216 | } |
| 217 | |
| 218 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 219 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 220 | phys_addr_t phys, pgprot_t prot, |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 221 | phys_addr_t (*pgtable_alloc)(void)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 222 | { |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 223 | pud_t *pud; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 224 | unsigned long next; |
| 225 | |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 226 | if (pgd_none(*pgd)) { |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 227 | phys_addr_t pud_phys = pgtable_alloc(); |
| 228 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 229 | } |
| 230 | BUG_ON(pgd_bad(*pgd)); |
| 231 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 232 | pud = pud_set_fixmap_offset(pgd, addr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 233 | do { |
| 234 | next = pud_addr_end(addr, end); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 235 | |
| 236 | /* |
| 237 | * For 4K granule only, attempt to put down a 1GB block |
| 238 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 239 | if (use_1G_block(addr, next, phys)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 240 | pud_t old_pud = *pud; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 241 | set_pud(pud, __pud(phys | |
| 242 | pgprot_val(mk_sect_prot(prot)))); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * If we have an old value for a pud, it will |
| 246 | * be pointing to a pmd table that we no longer |
| 247 | * need (from swapper_pg_dir). |
| 248 | * |
| 249 | * Look up the old pmd table and free it. |
| 250 | */ |
| 251 | if (!pud_none(old_pud)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 252 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 253 | if (pud_table(old_pud)) { |
Mark Rutland | 316b39db | 2016-01-25 11:45:05 +0000 | [diff] [blame] | 254 | phys_addr_t table = pud_page_paddr(old_pud); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 255 | if (!WARN_ON_ONCE(slab_is_available())) |
| 256 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 257 | } |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 258 | } |
| 259 | } else { |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 260 | alloc_init_pmd(mm, pud, addr, next, phys, prot, |
| 261 | pgtable_alloc); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 262 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 263 | phys += next - addr; |
| 264 | } while (pud++, addr = next, addr != end); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 265 | |
| 266 | pud_clear_fixmap(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Create the page directory entries and any necessary page tables for the |
| 271 | * mapping specified by 'md'. |
| 272 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 273 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 274 | phys_addr_t phys, unsigned long virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 275 | phys_addr_t size, pgprot_t prot, |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 276 | phys_addr_t (*pgtable_alloc)(void)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 277 | { |
| 278 | unsigned long addr, length, end, next; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 279 | |
Mark Rutland | cc5d2b3 | 2015-11-23 13:26:19 +0000 | [diff] [blame] | 280 | /* |
| 281 | * If the virtual and physical address don't have the same offset |
| 282 | * within a page, we cannot map the region as the caller expects. |
| 283 | */ |
| 284 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) |
| 285 | return; |
| 286 | |
Mark Rutland | 9c4e08a | 2015-11-23 13:26:20 +0000 | [diff] [blame] | 287 | phys &= PAGE_MASK; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 288 | addr = virt & PAGE_MASK; |
| 289 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); |
| 290 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 291 | end = addr + length; |
| 292 | do { |
| 293 | next = pgd_addr_end(addr, end); |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 294 | alloc_init_pud(mm, pgd, addr, next, phys, prot, pgtable_alloc); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 295 | phys += next - addr; |
| 296 | } while (pgd++, addr = next, addr != end); |
| 297 | } |
| 298 | |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 299 | static phys_addr_t late_pgtable_alloc(void) |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 300 | { |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 301 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 302 | BUG_ON(!ptr); |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 303 | |
| 304 | /* Ensure the zeroed page is visible to the page table walker */ |
| 305 | dsb(ishst); |
Mark Rutland | f471044 | 2016-01-25 11:45:08 +0000 | [diff] [blame] | 306 | return __pa(ptr); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 307 | } |
| 308 | |
Mark Rutland | c53e0ba | 2015-07-28 10:31:06 +0100 | [diff] [blame] | 309 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 310 | phys_addr_t size, pgprot_t prot) |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 311 | { |
| 312 | if (virt < VMALLOC_START) { |
| 313 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 314 | &phys, virt); |
| 315 | return; |
| 316 | } |
Mark Rutland | e2c30ee | 2015-12-09 12:44:36 +0000 | [diff] [blame] | 317 | __create_mapping(&init_mm, pgd_offset_k(virt), phys, virt, |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 318 | size, prot, early_pgtable_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 319 | } |
| 320 | |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 321 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
| 322 | unsigned long virt, phys_addr_t size, |
| 323 | pgprot_t prot) |
| 324 | { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 325 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 326 | late_pgtable_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 327 | } |
| 328 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 329 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
| 330 | phys_addr_t size, pgprot_t prot) |
| 331 | { |
| 332 | if (virt < VMALLOC_START) { |
| 333 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 334 | &phys, virt); |
| 335 | return; |
| 336 | } |
| 337 | |
Mark Rutland | e2c30ee | 2015-12-09 12:44:36 +0000 | [diff] [blame] | 338 | return __create_mapping(&init_mm, pgd_offset_k(virt), |
Mark Rutland | 21ab99c | 2016-01-25 11:44:56 +0000 | [diff] [blame] | 339 | phys, virt, size, prot, late_pgtable_alloc); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | #ifdef CONFIG_DEBUG_RODATA |
| 343 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 344 | { |
| 345 | /* |
| 346 | * Set up the executable regions using the existing section mappings |
| 347 | * for now. This will get more fine grained later once all memory |
| 348 | * is mapped |
| 349 | */ |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 350 | unsigned long kernel_x_start = round_down(__pa(_stext), SWAPPER_BLOCK_SIZE); |
| 351 | unsigned long kernel_x_end = round_up(__pa(__init_end), SWAPPER_BLOCK_SIZE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 352 | |
| 353 | if (end < kernel_x_start) { |
| 354 | create_mapping(start, __phys_to_virt(start), |
| 355 | end - start, PAGE_KERNEL); |
| 356 | } else if (start >= kernel_x_end) { |
| 357 | create_mapping(start, __phys_to_virt(start), |
| 358 | end - start, PAGE_KERNEL); |
| 359 | } else { |
| 360 | if (start < kernel_x_start) |
| 361 | create_mapping(start, __phys_to_virt(start), |
| 362 | kernel_x_start - start, |
| 363 | PAGE_KERNEL); |
| 364 | create_mapping(kernel_x_start, |
| 365 | __phys_to_virt(kernel_x_start), |
| 366 | kernel_x_end - kernel_x_start, |
| 367 | PAGE_KERNEL_EXEC); |
| 368 | if (kernel_x_end < end) |
| 369 | create_mapping(kernel_x_end, |
| 370 | __phys_to_virt(kernel_x_end), |
| 371 | end - kernel_x_end, |
| 372 | PAGE_KERNEL); |
| 373 | } |
| 374 | |
| 375 | } |
| 376 | #else |
| 377 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 378 | { |
| 379 | create_mapping(start, __phys_to_virt(start), end - start, |
| 380 | PAGE_KERNEL_EXEC); |
| 381 | } |
| 382 | #endif |
| 383 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 384 | static void __init map_mem(void) |
| 385 | { |
| 386 | struct memblock_region *reg; |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 387 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 388 | /* map all the memory banks */ |
| 389 | for_each_memblock(memory, reg) { |
| 390 | phys_addr_t start = reg->base; |
| 391 | phys_addr_t end = start + reg->size; |
| 392 | |
| 393 | if (start >= end) |
| 394 | break; |
Ard Biesheuvel | 68709f4 | 2015-11-30 13:28:16 +0100 | [diff] [blame] | 395 | if (memblock_is_nomap(reg)) |
| 396 | continue; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 397 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 398 | __map_memblock(start, end); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 399 | } |
| 400 | } |
| 401 | |
Jisheng Zhang | 9a17a21 | 2015-11-12 20:04:43 +0800 | [diff] [blame] | 402 | static void __init fixup_executable(void) |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 403 | { |
| 404 | #ifdef CONFIG_DEBUG_RODATA |
| 405 | /* now that we are actually fully mapped, make the start/end more fine grained */ |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 406 | if (!IS_ALIGNED((unsigned long)_stext, SWAPPER_BLOCK_SIZE)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 407 | unsigned long aligned_start = round_down(__pa(_stext), |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 408 | SWAPPER_BLOCK_SIZE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 409 | |
| 410 | create_mapping(aligned_start, __phys_to_virt(aligned_start), |
| 411 | __pa(_stext) - aligned_start, |
| 412 | PAGE_KERNEL); |
| 413 | } |
| 414 | |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 415 | if (!IS_ALIGNED((unsigned long)__init_end, SWAPPER_BLOCK_SIZE)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 416 | unsigned long aligned_end = round_up(__pa(__init_end), |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 417 | SWAPPER_BLOCK_SIZE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 418 | create_mapping(__pa(__init_end), (unsigned long)__init_end, |
| 419 | aligned_end - __pa(__init_end), |
| 420 | PAGE_KERNEL); |
| 421 | } |
| 422 | #endif |
| 423 | } |
| 424 | |
| 425 | #ifdef CONFIG_DEBUG_RODATA |
| 426 | void mark_rodata_ro(void) |
| 427 | { |
| 428 | create_mapping_late(__pa(_stext), (unsigned long)_stext, |
| 429 | (unsigned long)_etext - (unsigned long)_stext, |
Laura Abbott | 0b2aa5b | 2015-11-12 12:21:10 -0800 | [diff] [blame] | 430 | PAGE_KERNEL_ROX); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 431 | |
| 432 | } |
| 433 | #endif |
| 434 | |
| 435 | void fixup_init(void) |
| 436 | { |
| 437 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, |
| 438 | (unsigned long)__init_end - (unsigned long)__init_begin, |
| 439 | PAGE_KERNEL); |
| 440 | } |
| 441 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 442 | /* |
| 443 | * paging_init() sets up the page tables, initialises the zone memory |
| 444 | * maps and sets up the zero page. |
| 445 | */ |
| 446 | void __init paging_init(void) |
| 447 | { |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 448 | map_mem(); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 449 | fixup_executable(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 450 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 451 | bootmem_init(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | /* |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 455 | * Check whether a kernel address is valid (derived from arch/x86/). |
| 456 | */ |
| 457 | int kern_addr_valid(unsigned long addr) |
| 458 | { |
| 459 | pgd_t *pgd; |
| 460 | pud_t *pud; |
| 461 | pmd_t *pmd; |
| 462 | pte_t *pte; |
| 463 | |
| 464 | if ((((long)addr) >> VA_BITS) != -1UL) |
| 465 | return 0; |
| 466 | |
| 467 | pgd = pgd_offset_k(addr); |
| 468 | if (pgd_none(*pgd)) |
| 469 | return 0; |
| 470 | |
| 471 | pud = pud_offset(pgd, addr); |
| 472 | if (pud_none(*pud)) |
| 473 | return 0; |
| 474 | |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 475 | if (pud_sect(*pud)) |
| 476 | return pfn_valid(pud_pfn(*pud)); |
| 477 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 478 | pmd = pmd_offset(pud, addr); |
| 479 | if (pmd_none(*pmd)) |
| 480 | return 0; |
| 481 | |
Dave Anderson | da6e4cb | 2014-04-15 18:53:24 +0100 | [diff] [blame] | 482 | if (pmd_sect(*pmd)) |
| 483 | return pfn_valid(pmd_pfn(*pmd)); |
| 484 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 485 | pte = pte_offset_kernel(pmd, addr); |
| 486 | if (pte_none(*pte)) |
| 487 | return 0; |
| 488 | |
| 489 | return pfn_valid(pte_pfn(*pte)); |
| 490 | } |
| 491 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 492 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 493 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 494 | { |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 495 | return vmemmap_populate_basepages(start, end, node); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 496 | } |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 497 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 498 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 499 | { |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 500 | unsigned long addr = start; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 501 | unsigned long next; |
| 502 | pgd_t *pgd; |
| 503 | pud_t *pud; |
| 504 | pmd_t *pmd; |
| 505 | |
| 506 | do { |
| 507 | next = pmd_addr_end(addr, end); |
| 508 | |
| 509 | pgd = vmemmap_pgd_populate(addr, node); |
| 510 | if (!pgd) |
| 511 | return -ENOMEM; |
| 512 | |
| 513 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 514 | if (!pud) |
| 515 | return -ENOMEM; |
| 516 | |
| 517 | pmd = pmd_offset(pud, addr); |
| 518 | if (pmd_none(*pmd)) { |
| 519 | void *p = NULL; |
| 520 | |
| 521 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
| 522 | if (!p) |
| 523 | return -ENOMEM; |
| 524 | |
Catalin Marinas | a501e32 | 2014-04-03 15:57:15 +0100 | [diff] [blame] | 525 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 526 | } else |
| 527 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
| 528 | } while (addr = next, addr != end); |
| 529 | |
| 530 | return 0; |
| 531 | } |
| 532 | #endif /* CONFIG_ARM64_64K_PAGES */ |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 533 | void vmemmap_free(unsigned long start, unsigned long end) |
Tang Chen | 0197518 | 2013-02-22 16:33:08 -0800 | [diff] [blame] | 534 | { |
| 535 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 536 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 537 | |
| 538 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
Kirill A. Shutemov | 9f25e6a | 2015-04-14 15:45:39 -0700 | [diff] [blame] | 539 | #if CONFIG_PGTABLE_LEVELS > 2 |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 540 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
| 541 | #endif |
Kirill A. Shutemov | 9f25e6a | 2015-04-14 15:45:39 -0700 | [diff] [blame] | 542 | #if CONFIG_PGTABLE_LEVELS > 3 |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 543 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
| 544 | #endif |
| 545 | |
| 546 | static inline pud_t * fixmap_pud(unsigned long addr) |
| 547 | { |
| 548 | pgd_t *pgd = pgd_offset_k(addr); |
| 549 | |
| 550 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); |
| 551 | |
| 552 | return pud_offset(pgd, addr); |
| 553 | } |
| 554 | |
| 555 | static inline pmd_t * fixmap_pmd(unsigned long addr) |
| 556 | { |
| 557 | pud_t *pud = fixmap_pud(addr); |
| 558 | |
| 559 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); |
| 560 | |
| 561 | return pmd_offset(pud, addr); |
| 562 | } |
| 563 | |
| 564 | static inline pte_t * fixmap_pte(unsigned long addr) |
| 565 | { |
| 566 | pmd_t *pmd = fixmap_pmd(addr); |
| 567 | |
| 568 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); |
| 569 | |
| 570 | return pte_offset_kernel(pmd, addr); |
| 571 | } |
| 572 | |
| 573 | void __init early_fixmap_init(void) |
| 574 | { |
| 575 | pgd_t *pgd; |
| 576 | pud_t *pud; |
| 577 | pmd_t *pmd; |
| 578 | unsigned long addr = FIXADDR_START; |
| 579 | |
| 580 | pgd = pgd_offset_k(addr); |
| 581 | pgd_populate(&init_mm, pgd, bm_pud); |
| 582 | pud = pud_offset(pgd, addr); |
| 583 | pud_populate(&init_mm, pud, bm_pmd); |
| 584 | pmd = pmd_offset(pud, addr); |
| 585 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
| 586 | |
| 587 | /* |
| 588 | * The boot-ioremap range spans multiple pmds, for which |
| 589 | * we are not preparted: |
| 590 | */ |
| 591 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) |
| 592 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); |
| 593 | |
| 594 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) |
| 595 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
| 596 | WARN_ON(1); |
| 597 | pr_warn("pmd %p != %p, %p\n", |
| 598 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), |
| 599 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); |
| 600 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
| 601 | fix_to_virt(FIX_BTMAP_BEGIN)); |
| 602 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", |
| 603 | fix_to_virt(FIX_BTMAP_END)); |
| 604 | |
| 605 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); |
| 606 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | void __set_fixmap(enum fixed_addresses idx, |
| 611 | phys_addr_t phys, pgprot_t flags) |
| 612 | { |
| 613 | unsigned long addr = __fix_to_virt(idx); |
| 614 | pte_t *pte; |
| 615 | |
Mark Rutland | b63dbef | 2015-03-04 13:27:35 +0000 | [diff] [blame] | 616 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 617 | |
| 618 | pte = fixmap_pte(addr); |
| 619 | |
| 620 | if (pgprot_val(flags)) { |
| 621 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
| 622 | } else { |
| 623 | pte_clear(&init_mm, addr, pte); |
| 624 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); |
| 625 | } |
| 626 | } |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 627 | |
| 628 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
| 629 | { |
| 630 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); |
Ard Biesheuvel | fb226c3 | 2015-11-09 09:55:46 +0100 | [diff] [blame] | 631 | pgprot_t prot = PAGE_KERNEL_RO; |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 632 | int size, offset; |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 633 | void *dt_virt; |
| 634 | |
| 635 | /* |
| 636 | * Check whether the physical FDT address is set and meets the minimum |
| 637 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be |
| 638 | * at least 8 bytes so that we can always access the size field of the |
| 639 | * FDT header after mapping the first chunk, double check here if that |
| 640 | * is indeed the case. |
| 641 | */ |
| 642 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); |
| 643 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) |
| 644 | return NULL; |
| 645 | |
| 646 | /* |
| 647 | * Make sure that the FDT region can be mapped without the need to |
| 648 | * allocate additional translation table pages, so that it is safe |
| 649 | * to call create_mapping() this early. |
| 650 | * |
| 651 | * On 64k pages, the FDT will be mapped using PTEs, so we need to |
| 652 | * be in the same PMD as the rest of the fixmap. |
| 653 | * On 4k pages, we'll use section mappings for the FDT so we only |
| 654 | * have to be in the same PUD. |
| 655 | */ |
| 656 | BUILD_BUG_ON(dt_virt_base % SZ_2M); |
| 657 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 658 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
| 659 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 660 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 661 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 662 | dt_virt = (void *)dt_virt_base + offset; |
| 663 | |
| 664 | /* map the first chunk so we can read the size from the header */ |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 665 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
| 666 | SWAPPER_BLOCK_SIZE, prot); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 667 | |
| 668 | if (fdt_check_header(dt_virt) != 0) |
| 669 | return NULL; |
| 670 | |
| 671 | size = fdt_totalsize(dt_virt); |
| 672 | if (size > MAX_FDT_SIZE) |
| 673 | return NULL; |
| 674 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 675 | if (offset + size > SWAPPER_BLOCK_SIZE) |
| 676 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
| 677 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 678 | |
| 679 | memblock_reserve(dt_phys, size); |
| 680 | |
| 681 | return dt_virt; |
| 682 | } |