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 | |
| 33 | #include <asm/cputype.h> |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 34 | #include <asm/fixmap.h> |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 35 | #include <asm/kernel-pgtable.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 36 | #include <asm/sections.h> |
| 37 | #include <asm/setup.h> |
| 38 | #include <asm/sizes.h> |
| 39 | #include <asm/tlb.h> |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 40 | #include <asm/memblock.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 41 | #include <asm/mmu_context.h> |
| 42 | |
| 43 | #include "mm.h" |
| 44 | |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame] | 45 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
| 46 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 47 | /* |
| 48 | * Empty_zero_page is a special page that is used for zero-initialized data |
| 49 | * and COW. |
| 50 | */ |
| 51 | struct page *empty_zero_page; |
| 52 | EXPORT_SYMBOL(empty_zero_page); |
| 53 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 54 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| 55 | unsigned long size, pgprot_t vma_prot) |
| 56 | { |
| 57 | if (!pfn_valid(pfn)) |
| 58 | return pgprot_noncached(vma_prot); |
| 59 | else if (file->f_flags & O_SYNC) |
| 60 | return pgprot_writecombine(vma_prot); |
| 61 | return vma_prot; |
| 62 | } |
| 63 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 64 | |
| 65 | static void __init *early_alloc(unsigned long sz) |
| 66 | { |
Suzuki K. Poulose | 7142392 | 2015-11-20 17:45:40 +0000 | [diff] [blame] | 67 | phys_addr_t phys; |
| 68 | void *ptr; |
| 69 | |
| 70 | phys = memblock_alloc(sz, sz); |
| 71 | BUG_ON(!phys); |
| 72 | ptr = __va(phys); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 73 | memset(ptr, 0, sz); |
| 74 | return ptr; |
| 75 | } |
| 76 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 77 | /* |
| 78 | * remap a PMD into pages |
| 79 | */ |
| 80 | static void split_pmd(pmd_t *pmd, pte_t *pte) |
| 81 | { |
| 82 | unsigned long pfn = pmd_pfn(*pmd); |
| 83 | int i = 0; |
| 84 | |
| 85 | do { |
| 86 | /* |
| 87 | * Need to have the least restrictive permissions available |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 88 | * permissions will be fixed up later |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 89 | */ |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 90 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 91 | pfn++; |
| 92 | } while (pte++, i++, i < PTRS_PER_PTE); |
| 93 | } |
| 94 | |
| 95 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 96 | unsigned long end, unsigned long pfn, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 97 | pgprot_t prot, |
| 98 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 99 | { |
| 100 | pte_t *pte; |
| 101 | |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 102 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 103 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
| 104 | if (pmd_sect(*pmd)) |
| 105 | split_pmd(pmd, pte); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 106 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 107 | flush_tlb_all(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 108 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 109 | BUG_ON(pmd_bad(*pmd)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 110 | |
| 111 | pte = pte_offset_kernel(pmd, addr); |
| 112 | do { |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 113 | set_pte(pte, pfn_pte(pfn, prot)); |
| 114 | pfn++; |
| 115 | } while (pte++, addr += PAGE_SIZE, addr != end); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 116 | } |
| 117 | |
Jisheng Zhang | 9a17a21 | 2015-11-12 20:04:43 +0800 | [diff] [blame] | 118 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 119 | { |
| 120 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; |
| 121 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); |
| 122 | int i = 0; |
| 123 | |
| 124 | do { |
Ard Biesheuvel | 1e43ba9 | 2015-06-30 18:04:49 +0200 | [diff] [blame] | 125 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 126 | addr += PMD_SIZE; |
| 127 | } while (pmd++, i++, i < PTRS_PER_PMD); |
| 128 | } |
| 129 | |
| 130 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 131 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 132 | phys_addr_t phys, pgprot_t prot, |
| 133 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 134 | { |
| 135 | pmd_t *pmd; |
| 136 | unsigned long next; |
| 137 | |
| 138 | /* |
| 139 | * Check for initial section mappings in the pgd/pud and remove them. |
| 140 | */ |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 141 | if (pud_none(*pud) || pud_sect(*pud)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 142 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
| 143 | if (pud_sect(*pud)) { |
| 144 | /* |
| 145 | * need to have the 1G of mappings continue to be |
| 146 | * present |
| 147 | */ |
| 148 | split_pud(pud, pmd); |
| 149 | } |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 150 | pud_populate(mm, pud, pmd); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 151 | flush_tlb_all(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 152 | } |
Mark Rutland | a1c7657 | 2015-01-27 16:36:30 +0000 | [diff] [blame] | 153 | BUG_ON(pud_bad(*pud)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 154 | |
| 155 | pmd = pmd_offset(pud, addr); |
| 156 | do { |
| 157 | next = pmd_addr_end(addr, end); |
| 158 | /* try section mapping first */ |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 159 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
| 160 | pmd_t old_pmd =*pmd; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 161 | set_pmd(pmd, __pmd(phys | |
| 162 | pgprot_val(mk_sect_prot(prot)))); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 163 | /* |
| 164 | * Check for previous table entries created during |
| 165 | * boot (__create_page_tables) and flush them. |
| 166 | */ |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 167 | if (!pmd_none(old_pmd)) { |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 168 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 169 | if (pmd_table(old_pmd)) { |
| 170 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 171 | if (!WARN_ON_ONCE(slab_is_available())) |
| 172 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 173 | } |
| 174 | } |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 175 | } else { |
Catalin Marinas | 667c275 | 2015-11-26 15:42:41 +0000 | [diff] [blame] | 176 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
| 177 | prot, alloc); |
Catalin Marinas | a55f992 | 2014-02-04 16:01:31 +0000 | [diff] [blame] | 178 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 179 | phys += next - addr; |
| 180 | } while (pmd++, addr = next, addr != end); |
| 181 | } |
| 182 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 183 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
| 184 | unsigned long phys) |
| 185 | { |
| 186 | if (PAGE_SHIFT != 12) |
| 187 | return false; |
| 188 | |
| 189 | if (((addr | next | phys) & ~PUD_MASK) != 0) |
| 190 | return false; |
| 191 | |
| 192 | return true; |
| 193 | } |
| 194 | |
| 195 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 196 | unsigned long addr, unsigned long end, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 197 | phys_addr_t phys, pgprot_t prot, |
| 198 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 199 | { |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 200 | pud_t *pud; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 201 | unsigned long next; |
| 202 | |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 203 | if (pgd_none(*pgd)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 204 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 205 | pgd_populate(mm, pgd, pud); |
Jungseok Lee | c79b954 | 2014-05-12 18:40:51 +0900 | [diff] [blame] | 206 | } |
| 207 | BUG_ON(pgd_bad(*pgd)); |
| 208 | |
| 209 | pud = pud_offset(pgd, addr); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 210 | do { |
| 211 | next = pud_addr_end(addr, end); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 212 | |
| 213 | /* |
| 214 | * For 4K granule only, attempt to put down a 1GB block |
| 215 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 216 | if (use_1G_block(addr, next, phys)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 217 | pud_t old_pud = *pud; |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 218 | set_pud(pud, __pud(phys | |
| 219 | pgprot_val(mk_sect_prot(prot)))); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 220 | |
| 221 | /* |
| 222 | * If we have an old value for a pud, it will |
| 223 | * be pointing to a pmd table that we no longer |
| 224 | * need (from swapper_pg_dir). |
| 225 | * |
| 226 | * Look up the old pmd table and free it. |
| 227 | */ |
| 228 | if (!pud_none(old_pud)) { |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 229 | flush_tlb_all(); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 230 | if (pud_table(old_pud)) { |
| 231 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); |
Catalin Marinas | 4108935 | 2015-01-29 17:33:35 +0000 | [diff] [blame] | 232 | if (!WARN_ON_ONCE(slab_is_available())) |
| 233 | memblock_free(table, PAGE_SIZE); |
zhichang.yuan | 523d6e9 | 2014-12-09 07:26:47 +0000 | [diff] [blame] | 234 | } |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 235 | } |
| 236 | } else { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 237 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 238 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 239 | phys += next - addr; |
| 240 | } while (pud++, addr = next, addr != end); |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Create the page directory entries and any necessary page tables for the |
| 245 | * mapping specified by 'md'. |
| 246 | */ |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 247 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 248 | phys_addr_t phys, unsigned long virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 249 | phys_addr_t size, pgprot_t prot, |
| 250 | void *(*alloc)(unsigned long size)) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 251 | { |
| 252 | unsigned long addr, length, end, next; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 253 | |
| 254 | addr = virt & PAGE_MASK; |
| 255 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); |
| 256 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 257 | end = addr + length; |
| 258 | do { |
| 259 | next = pgd_addr_end(addr, end); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 260 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 261 | phys += next - addr; |
| 262 | } while (pgd++, addr = next, addr != end); |
| 263 | } |
| 264 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 265 | static void *late_alloc(unsigned long size) |
| 266 | { |
| 267 | void *ptr; |
| 268 | |
| 269 | BUG_ON(size > PAGE_SIZE); |
| 270 | ptr = (void *)__get_free_page(PGALLOC_GFP); |
| 271 | BUG_ON(!ptr); |
| 272 | return ptr; |
| 273 | } |
| 274 | |
Mark Rutland | c53e0ba | 2015-07-28 10:31:06 +0100 | [diff] [blame] | 275 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 276 | phys_addr_t size, pgprot_t prot) |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 277 | { |
| 278 | if (virt < VMALLOC_START) { |
| 279 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 280 | &phys, virt); |
| 281 | return; |
| 282 | } |
Ard Biesheuvel | e1e1fdd | 2014-10-20 14:02:15 +0200 | [diff] [blame] | 283 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 284 | size, prot, early_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 285 | } |
| 286 | |
Ard Biesheuvel | 8ce837c | 2014-10-20 15:42:07 +0200 | [diff] [blame] | 287 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
| 288 | unsigned long virt, phys_addr_t size, |
| 289 | pgprot_t prot) |
| 290 | { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 291 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
Ard Biesheuvel | 60305db | 2015-01-22 10:01:40 +0000 | [diff] [blame] | 292 | late_alloc); |
Mark Salter | d7ecbdd | 2014-03-12 12:28:06 -0400 | [diff] [blame] | 293 | } |
| 294 | |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 295 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
| 296 | phys_addr_t size, pgprot_t prot) |
| 297 | { |
| 298 | if (virt < VMALLOC_START) { |
| 299 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
| 300 | &phys, virt); |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), |
| 305 | phys, virt, size, prot, late_alloc); |
| 306 | } |
| 307 | |
| 308 | #ifdef CONFIG_DEBUG_RODATA |
| 309 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 310 | { |
| 311 | /* |
| 312 | * Set up the executable regions using the existing section mappings |
| 313 | * for now. This will get more fine grained later once all memory |
| 314 | * is mapped |
| 315 | */ |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 316 | unsigned long kernel_x_start = round_down(__pa(_stext), SWAPPER_BLOCK_SIZE); |
| 317 | 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] | 318 | |
| 319 | if (end < kernel_x_start) { |
| 320 | create_mapping(start, __phys_to_virt(start), |
| 321 | end - start, PAGE_KERNEL); |
| 322 | } else if (start >= kernel_x_end) { |
| 323 | create_mapping(start, __phys_to_virt(start), |
| 324 | end - start, PAGE_KERNEL); |
| 325 | } else { |
| 326 | if (start < kernel_x_start) |
| 327 | create_mapping(start, __phys_to_virt(start), |
| 328 | kernel_x_start - start, |
| 329 | PAGE_KERNEL); |
| 330 | create_mapping(kernel_x_start, |
| 331 | __phys_to_virt(kernel_x_start), |
| 332 | kernel_x_end - kernel_x_start, |
| 333 | PAGE_KERNEL_EXEC); |
| 334 | if (kernel_x_end < end) |
| 335 | create_mapping(kernel_x_end, |
| 336 | __phys_to_virt(kernel_x_end), |
| 337 | end - kernel_x_end, |
| 338 | PAGE_KERNEL); |
| 339 | } |
| 340 | |
| 341 | } |
| 342 | #else |
| 343 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) |
| 344 | { |
| 345 | create_mapping(start, __phys_to_virt(start), end - start, |
| 346 | PAGE_KERNEL_EXEC); |
| 347 | } |
| 348 | #endif |
| 349 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 350 | static void __init map_mem(void) |
| 351 | { |
| 352 | struct memblock_region *reg; |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 353 | phys_addr_t limit; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 354 | |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 355 | /* |
| 356 | * Temporarily limit the memblock range. We need to do this as |
| 357 | * create_mapping requires puds, pmds and ptes to be allocated from |
| 358 | * memory addressable from the initial direct kernel mapping. |
| 359 | * |
Catalin Marinas | 3dec0fe | 2014-10-24 18:16:47 +0100 | [diff] [blame] | 360 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 361 | * us PUD_SIZE (with SECTION maps) or PMD_SIZE (without SECTION maps, |
| 362 | * memory starting from PHYS_OFFSET (which must be aligned to 2MB as |
| 363 | * per Documentation/arm64/booting.txt). |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 364 | */ |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 365 | limit = PHYS_OFFSET + SWAPPER_INIT_MAP_SIZE; |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 366 | memblock_set_current_limit(limit); |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 367 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 368 | /* map all the memory banks */ |
| 369 | for_each_memblock(memory, reg) { |
| 370 | phys_addr_t start = reg->base; |
| 371 | phys_addr_t end = start + reg->size; |
| 372 | |
| 373 | if (start >= end) |
| 374 | break; |
| 375 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 376 | if (ARM64_SWAPPER_USES_SECTION_MAPS) { |
| 377 | /* |
| 378 | * For the first memory bank align the start address and |
| 379 | * current memblock limit to prevent create_mapping() from |
| 380 | * allocating pte page tables from unmapped memory. With |
| 381 | * the section maps, if the first block doesn't end on section |
| 382 | * size boundary, create_mapping() will try to allocate a pte |
| 383 | * page, which may be returned from an unmapped area. |
| 384 | * When section maps are not used, the pte page table for the |
| 385 | * current limit is already present in swapper_pg_dir. |
| 386 | */ |
| 387 | if (start < limit) |
| 388 | start = ALIGN(start, SECTION_SIZE); |
| 389 | if (end < limit) { |
| 390 | limit = end & SECTION_MASK; |
| 391 | memblock_set_current_limit(limit); |
| 392 | } |
Catalin Marinas | e25208f | 2013-08-23 18:04:44 +0100 | [diff] [blame] | 393 | } |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 394 | __map_memblock(start, end); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 395 | } |
Steve Capper | f6bc87c | 2013-04-30 11:00:33 +0100 | [diff] [blame] | 396 | |
| 397 | /* Limit no longer required. */ |
| 398 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 399 | } |
| 400 | |
Jisheng Zhang | 9a17a21 | 2015-11-12 20:04:43 +0800 | [diff] [blame] | 401 | static void __init fixup_executable(void) |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 402 | { |
| 403 | #ifdef CONFIG_DEBUG_RODATA |
| 404 | /* 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] | 405 | if (!IS_ALIGNED((unsigned long)_stext, SWAPPER_BLOCK_SIZE)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 406 | unsigned long aligned_start = round_down(__pa(_stext), |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 407 | SWAPPER_BLOCK_SIZE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 408 | |
| 409 | create_mapping(aligned_start, __phys_to_virt(aligned_start), |
| 410 | __pa(_stext) - aligned_start, |
| 411 | PAGE_KERNEL); |
| 412 | } |
| 413 | |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 414 | if (!IS_ALIGNED((unsigned long)__init_end, SWAPPER_BLOCK_SIZE)) { |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 415 | unsigned long aligned_end = round_up(__pa(__init_end), |
Ard Biesheuvel | 4fee9f3 | 2015-11-16 11:18:14 +0100 | [diff] [blame] | 416 | SWAPPER_BLOCK_SIZE); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 417 | create_mapping(__pa(__init_end), (unsigned long)__init_end, |
| 418 | aligned_end - __pa(__init_end), |
| 419 | PAGE_KERNEL); |
| 420 | } |
| 421 | #endif |
| 422 | } |
| 423 | |
| 424 | #ifdef CONFIG_DEBUG_RODATA |
| 425 | void mark_rodata_ro(void) |
| 426 | { |
| 427 | create_mapping_late(__pa(_stext), (unsigned long)_stext, |
| 428 | (unsigned long)_etext - (unsigned long)_stext, |
Laura Abbott | 0b2aa5b | 2015-11-12 12:21:10 -0800 | [diff] [blame] | 429 | PAGE_KERNEL_ROX); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 430 | |
| 431 | } |
| 432 | #endif |
| 433 | |
| 434 | void fixup_init(void) |
| 435 | { |
| 436 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, |
| 437 | (unsigned long)__init_end - (unsigned long)__init_begin, |
| 438 | PAGE_KERNEL); |
| 439 | } |
| 440 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 441 | /* |
| 442 | * paging_init() sets up the page tables, initialises the zone memory |
| 443 | * maps and sets up the zero page. |
| 444 | */ |
| 445 | void __init paging_init(void) |
| 446 | { |
| 447 | void *zero_page; |
| 448 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 449 | map_mem(); |
Laura Abbott | da14170 | 2015-01-21 17:36:06 -0800 | [diff] [blame] | 450 | fixup_executable(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 451 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 452 | /* allocate the zero page. */ |
| 453 | zero_page = early_alloc(PAGE_SIZE); |
| 454 | |
| 455 | bootmem_init(); |
| 456 | |
| 457 | empty_zero_page = virt_to_page(zero_page); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 458 | |
| 459 | /* |
| 460 | * TTBR0 is only used for the identity mapping at this stage. Make it |
| 461 | * point to zero page to avoid speculatively fetching new entries. |
| 462 | */ |
| 463 | cpu_set_reserved_ttbr0(); |
Will Deacon | 8e63d38 | 2015-10-06 18:46:23 +0100 | [diff] [blame] | 464 | local_flush_tlb_all(); |
Ard Biesheuvel | dd006da | 2015-03-19 16:42:27 +0000 | [diff] [blame] | 465 | cpu_set_default_tcr_t0sz(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /* |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 469 | * Check whether a kernel address is valid (derived from arch/x86/). |
| 470 | */ |
| 471 | int kern_addr_valid(unsigned long addr) |
| 472 | { |
| 473 | pgd_t *pgd; |
| 474 | pud_t *pud; |
| 475 | pmd_t *pmd; |
| 476 | pte_t *pte; |
| 477 | |
| 478 | if ((((long)addr) >> VA_BITS) != -1UL) |
| 479 | return 0; |
| 480 | |
| 481 | pgd = pgd_offset_k(addr); |
| 482 | if (pgd_none(*pgd)) |
| 483 | return 0; |
| 484 | |
| 485 | pud = pud_offset(pgd, addr); |
| 486 | if (pud_none(*pud)) |
| 487 | return 0; |
| 488 | |
Steve Capper | 206a2a7 | 2014-05-06 14:02:27 +0100 | [diff] [blame] | 489 | if (pud_sect(*pud)) |
| 490 | return pfn_valid(pud_pfn(*pud)); |
| 491 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 492 | pmd = pmd_offset(pud, addr); |
| 493 | if (pmd_none(*pmd)) |
| 494 | return 0; |
| 495 | |
Dave Anderson | da6e4cb | 2014-04-15 18:53:24 +0100 | [diff] [blame] | 496 | if (pmd_sect(*pmd)) |
| 497 | return pfn_valid(pmd_pfn(*pmd)); |
| 498 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 499 | pte = pte_offset_kernel(pmd, addr); |
| 500 | if (pte_none(*pte)) |
| 501 | return 0; |
| 502 | |
| 503 | return pfn_valid(pte_pfn(*pte)); |
| 504 | } |
| 505 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 506 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 507 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 508 | { |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 509 | return vmemmap_populate_basepages(start, end, node); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 510 | } |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 511 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
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 | unsigned long addr = start; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 515 | unsigned long next; |
| 516 | pgd_t *pgd; |
| 517 | pud_t *pud; |
| 518 | pmd_t *pmd; |
| 519 | |
| 520 | do { |
| 521 | next = pmd_addr_end(addr, end); |
| 522 | |
| 523 | pgd = vmemmap_pgd_populate(addr, node); |
| 524 | if (!pgd) |
| 525 | return -ENOMEM; |
| 526 | |
| 527 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 528 | if (!pud) |
| 529 | return -ENOMEM; |
| 530 | |
| 531 | pmd = pmd_offset(pud, addr); |
| 532 | if (pmd_none(*pmd)) { |
| 533 | void *p = NULL; |
| 534 | |
| 535 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
| 536 | if (!p) |
| 537 | return -ENOMEM; |
| 538 | |
Catalin Marinas | a501e32 | 2014-04-03 15:57:15 +0100 | [diff] [blame] | 539 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 540 | } else |
| 541 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
| 542 | } while (addr = next, addr != end); |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | #endif /* CONFIG_ARM64_64K_PAGES */ |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 547 | void vmemmap_free(unsigned long start, unsigned long end) |
Tang Chen | 0197518 | 2013-02-22 16:33:08 -0800 | [diff] [blame] | 548 | { |
| 549 | } |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 550 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 551 | |
| 552 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
Kirill A. Shutemov | 9f25e6a | 2015-04-14 15:45:39 -0700 | [diff] [blame] | 553 | #if CONFIG_PGTABLE_LEVELS > 2 |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 554 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
| 555 | #endif |
Kirill A. Shutemov | 9f25e6a | 2015-04-14 15:45:39 -0700 | [diff] [blame] | 556 | #if CONFIG_PGTABLE_LEVELS > 3 |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 557 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
| 558 | #endif |
| 559 | |
| 560 | static inline pud_t * fixmap_pud(unsigned long addr) |
| 561 | { |
| 562 | pgd_t *pgd = pgd_offset_k(addr); |
| 563 | |
| 564 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); |
| 565 | |
| 566 | return pud_offset(pgd, addr); |
| 567 | } |
| 568 | |
| 569 | static inline pmd_t * fixmap_pmd(unsigned long addr) |
| 570 | { |
| 571 | pud_t *pud = fixmap_pud(addr); |
| 572 | |
| 573 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); |
| 574 | |
| 575 | return pmd_offset(pud, addr); |
| 576 | } |
| 577 | |
| 578 | static inline pte_t * fixmap_pte(unsigned long addr) |
| 579 | { |
| 580 | pmd_t *pmd = fixmap_pmd(addr); |
| 581 | |
| 582 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); |
| 583 | |
| 584 | return pte_offset_kernel(pmd, addr); |
| 585 | } |
| 586 | |
| 587 | void __init early_fixmap_init(void) |
| 588 | { |
| 589 | pgd_t *pgd; |
| 590 | pud_t *pud; |
| 591 | pmd_t *pmd; |
| 592 | unsigned long addr = FIXADDR_START; |
| 593 | |
| 594 | pgd = pgd_offset_k(addr); |
| 595 | pgd_populate(&init_mm, pgd, bm_pud); |
| 596 | pud = pud_offset(pgd, addr); |
| 597 | pud_populate(&init_mm, pud, bm_pmd); |
| 598 | pmd = pmd_offset(pud, addr); |
| 599 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
| 600 | |
| 601 | /* |
| 602 | * The boot-ioremap range spans multiple pmds, for which |
| 603 | * we are not preparted: |
| 604 | */ |
| 605 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) |
| 606 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); |
| 607 | |
| 608 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) |
| 609 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
| 610 | WARN_ON(1); |
| 611 | pr_warn("pmd %p != %p, %p\n", |
| 612 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), |
| 613 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); |
| 614 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
| 615 | fix_to_virt(FIX_BTMAP_BEGIN)); |
| 616 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", |
| 617 | fix_to_virt(FIX_BTMAP_END)); |
| 618 | |
| 619 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); |
| 620 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | void __set_fixmap(enum fixed_addresses idx, |
| 625 | phys_addr_t phys, pgprot_t flags) |
| 626 | { |
| 627 | unsigned long addr = __fix_to_virt(idx); |
| 628 | pte_t *pte; |
| 629 | |
Mark Rutland | b63dbef | 2015-03-04 13:27:35 +0000 | [diff] [blame] | 630 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
Laura Abbott | af86e59 | 2014-11-21 21:50:42 +0000 | [diff] [blame] | 631 | |
| 632 | pte = fixmap_pte(addr); |
| 633 | |
| 634 | if (pgprot_val(flags)) { |
| 635 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
| 636 | } else { |
| 637 | pte_clear(&init_mm, addr, pte); |
| 638 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); |
| 639 | } |
| 640 | } |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 641 | |
| 642 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
| 643 | { |
| 644 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); |
Ard Biesheuvel | fb226c3 | 2015-11-09 09:55:46 +0100 | [diff] [blame] | 645 | pgprot_t prot = PAGE_KERNEL_RO; |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 646 | int size, offset; |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 647 | void *dt_virt; |
| 648 | |
| 649 | /* |
| 650 | * Check whether the physical FDT address is set and meets the minimum |
| 651 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be |
| 652 | * at least 8 bytes so that we can always access the size field of the |
| 653 | * FDT header after mapping the first chunk, double check here if that |
| 654 | * is indeed the case. |
| 655 | */ |
| 656 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); |
| 657 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) |
| 658 | return NULL; |
| 659 | |
| 660 | /* |
| 661 | * Make sure that the FDT region can be mapped without the need to |
| 662 | * allocate additional translation table pages, so that it is safe |
| 663 | * to call create_mapping() this early. |
| 664 | * |
| 665 | * On 64k pages, the FDT will be mapped using PTEs, so we need to |
| 666 | * be in the same PMD as the rest of the fixmap. |
| 667 | * On 4k pages, we'll use section mappings for the FDT so we only |
| 668 | * have to be in the same PUD. |
| 669 | */ |
| 670 | BUILD_BUG_ON(dt_virt_base % SZ_2M); |
| 671 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 672 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
| 673 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 674 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 675 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 676 | dt_virt = (void *)dt_virt_base + offset; |
| 677 | |
| 678 | /* 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] | 679 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
| 680 | SWAPPER_BLOCK_SIZE, prot); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 681 | |
| 682 | if (fdt_check_header(dt_virt) != 0) |
| 683 | return NULL; |
| 684 | |
| 685 | size = fdt_totalsize(dt_virt); |
| 686 | if (size > MAX_FDT_SIZE) |
| 687 | return NULL; |
| 688 | |
Suzuki K. Poulose | b433dce | 2015-10-19 14:19:28 +0100 | [diff] [blame] | 689 | if (offset + size > SWAPPER_BLOCK_SIZE) |
| 690 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
| 691 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); |
Ard Biesheuvel | 61bd93c | 2015-06-01 13:40:32 +0200 | [diff] [blame] | 692 | |
| 693 | memblock_reserve(dt_phys, size); |
| 694 | |
| 695 | return dt_virt; |
| 696 | } |