Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
| 2 | * This file contains the routines setting up the linux page tables. |
| 3 | * -- paulus |
| 4 | * |
| 5 | * Derived from arch/ppc/mm/init.c: |
| 6 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 7 | * |
| 8 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) |
| 9 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) |
| 10 | * Copyright (C) 1996 Paul Mackerras |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 11 | * |
| 12 | * Derived from "arch/i386/mm/init.c" |
| 13 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License |
| 17 | * as published by the Free Software Foundation; either version |
| 18 | * 2 of the License, or (at your option) any later version. |
| 19 | * |
| 20 | */ |
| 21 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/vmalloc.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/highmem.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 29 | #include <linux/memblock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 31 | |
| 32 | #include <asm/pgtable.h> |
| 33 | #include <asm/pgalloc.h> |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 34 | #include <asm/fixmap.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 35 | #include <asm/io.h> |
David Howells | ae3a197 | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 36 | #include <asm/setup.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 37 | |
| 38 | #include "mmu_decl.h" |
| 39 | |
| 40 | unsigned long ioremap_base; |
| 41 | unsigned long ioremap_bot; |
Olaf Hering | 920573b | 2006-03-14 21:21:11 +0100 | [diff] [blame] | 42 | EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 43 | |
Michael Ellerman | c3993f1 | 2014-07-10 12:29:22 +1000 | [diff] [blame] | 44 | #ifdef CONFIG_6xx |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 45 | #define HAVE_BATS 1 |
| 46 | #endif |
| 47 | |
| 48 | #if defined(CONFIG_FSL_BOOKE) |
| 49 | #define HAVE_TLBCAM 1 |
| 50 | #endif |
| 51 | |
| 52 | extern char etext[], _stext[]; |
| 53 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 54 | #ifdef HAVE_BATS |
Becky Bruce | 7c5c432 | 2008-06-14 09:41:42 +1000 | [diff] [blame] | 55 | extern phys_addr_t v_mapped_by_bats(unsigned long va); |
| 56 | extern unsigned long p_mapped_by_bats(phys_addr_t pa); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 57 | #else /* !HAVE_BATS */ |
| 58 | #define v_mapped_by_bats(x) (0UL) |
| 59 | #define p_mapped_by_bats(x) (0UL) |
| 60 | #endif /* HAVE_BATS */ |
| 61 | |
| 62 | #ifdef HAVE_TLBCAM |
Kumar Gala | 6c24b17 | 2009-02-09 21:08:07 -0600 | [diff] [blame] | 63 | extern phys_addr_t v_mapped_by_tlbcam(unsigned long va); |
| 64 | extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 65 | #else /* !HAVE_TLBCAM */ |
| 66 | #define v_mapped_by_tlbcam(x) (0UL) |
| 67 | #define p_mapped_by_tlbcam(x) (0UL) |
| 68 | #endif /* HAVE_TLBCAM */ |
| 69 | |
Ilya Yanok | ca9153a | 2008-12-11 04:55:41 +0300 | [diff] [blame] | 70 | #define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 71 | |
LEROY Christophe | ce67f5d | 2015-01-20 10:57:34 +0100 | [diff] [blame] | 72 | #ifndef CONFIG_PPC_4K_PAGES |
| 73 | static struct kmem_cache *pgtable_cache; |
| 74 | |
| 75 | void pgtable_cache_init(void) |
| 76 | { |
| 77 | pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER, |
| 78 | 1 << PGDIR_ORDER, 0, NULL); |
| 79 | if (pgtable_cache == NULL) |
| 80 | panic("Couldn't allocate pgtable caches"); |
| 81 | } |
| 82 | #endif |
| 83 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 84 | pgd_t *pgd_alloc(struct mm_struct *mm) |
| 85 | { |
| 86 | pgd_t *ret; |
| 87 | |
Ilya Yanok | ca9153a | 2008-12-11 04:55:41 +0300 | [diff] [blame] | 88 | /* pgdir take page or two with 4K pages and a page fraction otherwise */ |
| 89 | #ifndef CONFIG_PPC_4K_PAGES |
LEROY Christophe | ce67f5d | 2015-01-20 10:57:34 +0100 | [diff] [blame] | 90 | ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO); |
Ilya Yanok | ca9153a | 2008-12-11 04:55:41 +0300 | [diff] [blame] | 91 | #else |
| 92 | ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
| 93 | PGDIR_ORDER - PAGE_SHIFT); |
| 94 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 95 | return ret; |
| 96 | } |
| 97 | |
Benjamin Herrenschmidt | 5e54197 | 2008-02-04 22:29:14 -0800 | [diff] [blame] | 98 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | { |
Ilya Yanok | ca9153a | 2008-12-11 04:55:41 +0300 | [diff] [blame] | 100 | #ifndef CONFIG_PPC_4K_PAGES |
LEROY Christophe | ce67f5d | 2015-01-20 10:57:34 +0100 | [diff] [blame] | 101 | kmem_cache_free(pgtable_cache, (void *)pgd); |
Ilya Yanok | ca9153a | 2008-12-11 04:55:41 +0300 | [diff] [blame] | 102 | #else |
| 103 | free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); |
| 104 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 105 | } |
| 106 | |
Kumar Gala | f1aed92 | 2007-05-23 07:49:37 -0500 | [diff] [blame] | 107 | __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 108 | { |
| 109 | pte_t *pte; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 110 | |
Michael Ellerman | f691fa1 | 2015-03-30 14:10:37 +1100 | [diff] [blame] | 111 | if (slab_is_available()) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 112 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
| 113 | } else { |
Anton Blanchard | 1023973 | 2014-09-17 22:15:33 +1000 | [diff] [blame] | 114 | pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 115 | if (pte) |
| 116 | clear_page(pte); |
| 117 | } |
| 118 | return pte; |
| 119 | } |
| 120 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 121 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 122 | { |
| 123 | struct page *ptepage; |
| 124 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 125 | gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 126 | |
| 127 | ptepage = alloc_pages(flags, 0); |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 128 | if (!ptepage) |
| 129 | return NULL; |
Kirill A. Shutemov | 4f804943 | 2013-11-14 14:31:38 -0800 | [diff] [blame] | 130 | if (!pgtable_page_ctor(ptepage)) { |
| 131 | __free_page(ptepage); |
| 132 | return NULL; |
| 133 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 134 | return ptepage; |
| 135 | } |
| 136 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 137 | void __iomem * |
| 138 | ioremap(phys_addr_t addr, unsigned long size) |
| 139 | { |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 140 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED, |
| 141 | __builtin_return_address(0)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 142 | } |
Olaf Hering | 920573b | 2006-03-14 21:21:11 +0100 | [diff] [blame] | 143 | EXPORT_SYMBOL(ioremap); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 144 | |
| 145 | void __iomem * |
Anton Blanchard | be135f4 | 2011-05-08 21:41:59 +0000 | [diff] [blame] | 146 | ioremap_wc(phys_addr_t addr, unsigned long size) |
| 147 | { |
| 148 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE, |
| 149 | __builtin_return_address(0)); |
| 150 | } |
| 151 | EXPORT_SYMBOL(ioremap_wc); |
| 152 | |
| 153 | void __iomem * |
Anton Blanchard | 40f1ce7 | 2011-05-08 21:43:47 +0000 | [diff] [blame] | 154 | ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 155 | { |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 156 | /* writeable implies dirty for kernel addresses */ |
LEROY Christophe | a7b9f67 | 2015-01-19 17:04:38 +0100 | [diff] [blame] | 157 | if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO) |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 158 | flags |= _PAGE_DIRTY | _PAGE_HWWRITE; |
| 159 | |
| 160 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ |
Benjamin Herrenschmidt | ea3cc33 | 2009-08-18 19:00:34 +0000 | [diff] [blame] | 161 | flags &= ~(_PAGE_USER | _PAGE_EXEC); |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 162 | |
Benjamin Herrenschmidt | 55052ee | 2010-04-07 14:39:36 +1000 | [diff] [blame] | 163 | #ifdef _PAGE_BAP_SR |
| 164 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format |
| 165 | * which means that we just cleared supervisor access... oops ;-) This |
| 166 | * restores it |
| 167 | */ |
| 168 | flags |= _PAGE_BAP_SR; |
| 169 | #endif |
| 170 | |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 171 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 172 | } |
Anton Blanchard | 40f1ce7 | 2011-05-08 21:43:47 +0000 | [diff] [blame] | 173 | EXPORT_SYMBOL(ioremap_prot); |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 174 | |
| 175 | void __iomem * |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 176 | __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) |
| 177 | { |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 178 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
| 179 | } |
| 180 | |
| 181 | void __iomem * |
| 182 | __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags, |
| 183 | void *caller) |
| 184 | { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 185 | unsigned long v, i; |
| 186 | phys_addr_t p; |
| 187 | int err; |
| 188 | |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 189 | /* Make sure we have the base flags */ |
| 190 | if ((flags & _PAGE_PRESENT) == 0) |
Michael Ellerman | 4f9c53c | 2015-03-25 20:11:57 +1100 | [diff] [blame] | 191 | flags |= pgprot_val(PAGE_KERNEL); |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 192 | |
| 193 | /* Non-cacheable page cannot be coherent */ |
| 194 | if (flags & _PAGE_NO_CACHE) |
| 195 | flags &= ~_PAGE_COHERENT; |
| 196 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 197 | /* |
| 198 | * Choose an address to map it to. |
| 199 | * Once the vmalloc system is running, we use it. |
| 200 | * Before then, we use space going down from ioremap_base |
| 201 | * (ioremap_bot records where we're up to). |
| 202 | */ |
| 203 | p = addr & PAGE_MASK; |
| 204 | size = PAGE_ALIGN(addr + size) - p; |
| 205 | |
| 206 | /* |
| 207 | * If the address lies within the first 16 MB, assume it's in ISA |
| 208 | * memory space |
| 209 | */ |
| 210 | if (p < 16*1024*1024) |
| 211 | p += _ISA_MEM_BASE; |
| 212 | |
Anton Vorontsov | 01695a9 | 2008-12-17 10:09:10 +0000 | [diff] [blame] | 213 | #ifndef CONFIG_CRASH_DUMP |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 214 | /* |
| 215 | * Don't allow anybody to remap normal RAM that we're using. |
| 216 | * mem_init() sets high_memory so only do the check after that. |
| 217 | */ |
Michael Ellerman | f691fa1 | 2015-03-30 14:10:37 +1100 | [diff] [blame] | 218 | if (slab_is_available() && (p < virt_to_phys(high_memory)) && |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 219 | !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { |
Scott Wood | cc83458 | 2015-03-11 22:13:46 -0500 | [diff] [blame] | 220 | printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n", |
David Gibson | 37f01d6 | 2007-04-24 15:05:18 +1000 | [diff] [blame] | 221 | (unsigned long long)p, __builtin_return_address(0)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 222 | return NULL; |
| 223 | } |
Anton Vorontsov | 01695a9 | 2008-12-17 10:09:10 +0000 | [diff] [blame] | 224 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 225 | |
| 226 | if (size == 0) |
| 227 | return NULL; |
| 228 | |
| 229 | /* |
| 230 | * Is it already mapped? Perhaps overlapped by a previous |
| 231 | * BAT mapping. If the whole area is mapped then we're done, |
| 232 | * otherwise remap it since we want to keep the virt addrs for |
| 233 | * each request contiguous. |
| 234 | * |
| 235 | * We make the assumption here that if the bottom and top |
| 236 | * of the range we want are mapped then it's mapped to the |
| 237 | * same virt address (and this is contiguous). |
| 238 | * -- Cort |
| 239 | */ |
| 240 | if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) |
| 241 | goto out; |
| 242 | |
| 243 | if ((v = p_mapped_by_tlbcam(p))) |
| 244 | goto out; |
| 245 | |
Michael Ellerman | f691fa1 | 2015-03-30 14:10:37 +1100 | [diff] [blame] | 246 | if (slab_is_available()) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 247 | struct vm_struct *area; |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 248 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 249 | if (area == 0) |
| 250 | return NULL; |
Michael Ellerman | 7a9d125 | 2010-11-28 18:26:36 +0000 | [diff] [blame] | 251 | area->phys_addr = p; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 252 | v = (unsigned long) area->addr; |
| 253 | } else { |
| 254 | v = (ioremap_bot -= size); |
| 255 | } |
| 256 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 257 | /* |
| 258 | * Should check if it is a candidate for a BAT mapping |
| 259 | */ |
| 260 | |
| 261 | err = 0; |
| 262 | for (i = 0; i < size && err == 0; i += PAGE_SIZE) |
| 263 | err = map_page(v+i, p+i, flags); |
| 264 | if (err) { |
Michael Ellerman | f691fa1 | 2015-03-30 14:10:37 +1100 | [diff] [blame] | 265 | if (slab_is_available()) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 266 | vunmap((void *)v); |
| 267 | return NULL; |
| 268 | } |
| 269 | |
| 270 | out: |
| 271 | return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); |
| 272 | } |
Olaf Hering | 920573b | 2006-03-14 21:21:11 +0100 | [diff] [blame] | 273 | EXPORT_SYMBOL(__ioremap); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 274 | |
| 275 | void iounmap(volatile void __iomem *addr) |
| 276 | { |
| 277 | /* |
| 278 | * If mapped by BATs then there is nothing to do. |
| 279 | * Calling vfree() generates a benign warning. |
| 280 | */ |
| 281 | if (v_mapped_by_bats((unsigned long)addr)) return; |
| 282 | |
| 283 | if (addr > high_memory && (unsigned long) addr < ioremap_bot) |
| 284 | vunmap((void *) (PAGE_MASK & (unsigned long)addr)); |
| 285 | } |
Olaf Hering | 920573b | 2006-03-14 21:21:11 +0100 | [diff] [blame] | 286 | EXPORT_SYMBOL(iounmap); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 287 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 288 | int map_page(unsigned long va, phys_addr_t pa, int flags) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 289 | { |
| 290 | pmd_t *pd; |
| 291 | pte_t *pg; |
| 292 | int err = -ENOMEM; |
| 293 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 294 | /* Use upper 10 bits of VA to index the first level map */ |
David Gibson | d1953c8 | 2007-05-08 12:46:49 +1000 | [diff] [blame] | 295 | pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 296 | /* Use middle 10 bits of VA to index the second-level map */ |
Paul Mackerras | e2f2e58 | 2005-10-31 14:40:03 +1100 | [diff] [blame] | 297 | pg = pte_alloc_kernel(pd, va); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 298 | if (pg != 0) { |
| 299 | err = 0; |
Benjamin Herrenschmidt | 3be4e69 | 2007-04-12 15:30:21 +1000 | [diff] [blame] | 300 | /* The PTE should never be already set nor present in the |
| 301 | * hash table |
| 302 | */ |
Anton Vorontsov | 7021d86 | 2008-12-29 06:40:35 +0000 | [diff] [blame] | 303 | BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) && |
| 304 | flags); |
Benjamin Herrenschmidt | 3be4e69 | 2007-04-12 15:30:21 +1000 | [diff] [blame] | 305 | set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, |
| 306 | __pgprot(flags))); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 307 | } |
Scott Wood | 47ce8af | 2013-10-11 19:22:37 -0500 | [diff] [blame] | 308 | smp_wmb(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 309 | return err; |
| 310 | } |
| 311 | |
| 312 | /* |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 313 | * Map in a chunk of physical memory starting at start. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 314 | */ |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 315 | void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 316 | { |
Kumar Gala | 99c62dd7 | 2008-04-16 05:52:21 +1000 | [diff] [blame] | 317 | unsigned long v, s, f; |
| 318 | phys_addr_t p; |
Benjamin Herrenschmidt | ee4f2ea | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 319 | int ktext; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 320 | |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 321 | s = offset; |
Dale Farnsworth | ccdcef7 | 2008-12-17 10:09:13 +0000 | [diff] [blame] | 322 | v = PAGE_OFFSET + s; |
Kumar Gala | 99c62dd7 | 2008-04-16 05:52:21 +1000 | [diff] [blame] | 323 | p = memstart_addr + s; |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 324 | for (; s < top; s += PAGE_SIZE) { |
Benjamin Herrenschmidt | ee4f2ea | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 325 | ktext = ((char *) v >= _stext && (char *) v < etext); |
Michael Ellerman | 4f9c53c | 2015-03-25 20:11:57 +1100 | [diff] [blame] | 326 | f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 327 | map_page(v, p, f); |
Benjamin Herrenschmidt | ee4f2ea | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 328 | #ifdef CONFIG_PPC_STD_MMU_32 |
| 329 | if (ktext) |
| 330 | hash_preload(&init_mm, v, 0, 0x300); |
| 331 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 332 | v += PAGE_SIZE; |
| 333 | p += PAGE_SIZE; |
| 334 | } |
| 335 | } |
| 336 | |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 337 | void __init mapin_ram(void) |
| 338 | { |
| 339 | unsigned long s, top; |
| 340 | |
| 341 | #ifndef CONFIG_WII |
| 342 | top = total_lowmem; |
| 343 | s = mmu_mapin_ram(top); |
| 344 | __mapin_ram_chunk(s, top); |
| 345 | #else |
| 346 | if (!wii_hole_size) { |
| 347 | s = mmu_mapin_ram(total_lowmem); |
| 348 | __mapin_ram_chunk(s, total_lowmem); |
| 349 | } else { |
| 350 | top = wii_hole_start; |
| 351 | s = mmu_mapin_ram(top); |
| 352 | __mapin_ram_chunk(s, top); |
| 353 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 354 | top = memblock_end_of_DRAM(); |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 355 | s = wii_mmu_mapin_mem2(top); |
| 356 | __mapin_ram_chunk(s, top); |
| 357 | } |
| 358 | #endif |
| 359 | } |
| 360 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 361 | /* Scan the real Linux page tables and return a PTE pointer for |
| 362 | * a virtual address in a context. |
| 363 | * Returns true (1) if PTE was found, zero otherwise. The pointer to |
| 364 | * the PTE pointer is unmodified if PTE is not found. |
| 365 | */ |
| 366 | int |
Eugene Surovegin | bab70a4 | 2006-03-28 10:13:12 -0800 | [diff] [blame] | 367 | get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 368 | { |
| 369 | pgd_t *pgd; |
David Gibson | d1953c8 | 2007-05-08 12:46:49 +1000 | [diff] [blame] | 370 | pud_t *pud; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 371 | pmd_t *pmd; |
| 372 | pte_t *pte; |
| 373 | int retval = 0; |
| 374 | |
| 375 | pgd = pgd_offset(mm, addr & PAGE_MASK); |
| 376 | if (pgd) { |
David Gibson | d1953c8 | 2007-05-08 12:46:49 +1000 | [diff] [blame] | 377 | pud = pud_offset(pgd, addr & PAGE_MASK); |
| 378 | if (pud && pud_present(*pud)) { |
| 379 | pmd = pmd_offset(pud, addr & PAGE_MASK); |
| 380 | if (pmd_present(*pmd)) { |
| 381 | pte = pte_offset_map(pmd, addr & PAGE_MASK); |
| 382 | if (pte) { |
| 383 | retval = 1; |
| 384 | *ptep = pte; |
| 385 | if (pmdp) |
| 386 | *pmdp = pmd; |
| 387 | /* XXX caller needs to do pte_unmap, yuck */ |
| 388 | } |
| 389 | } |
| 390 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 391 | } |
| 392 | return(retval); |
| 393 | } |
| 394 | |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 395 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 396 | |
| 397 | static int __change_page_attr(struct page *page, pgprot_t prot) |
| 398 | { |
| 399 | pte_t *kpte; |
| 400 | pmd_t *kpmd; |
| 401 | unsigned long address; |
| 402 | |
| 403 | BUG_ON(PageHighMem(page)); |
| 404 | address = (unsigned long)page_address(page); |
| 405 | |
| 406 | if (v_mapped_by_bats(address) || v_mapped_by_tlbcam(address)) |
| 407 | return 0; |
| 408 | if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) |
| 409 | return -EINVAL; |
Benjamin Herrenschmidt | 5089145 | 2009-12-08 21:08:44 +0000 | [diff] [blame] | 410 | __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 411 | wmb(); |
Benjamin Herrenschmidt | f63837f | 2008-12-14 19:44:51 +0000 | [diff] [blame] | 412 | flush_tlb_page(NULL, address); |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 413 | pte_unmap(kpte); |
| 414 | |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Change the page attributes of an page in the linear mapping. |
| 420 | * |
| 421 | * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY |
| 422 | */ |
| 423 | static int change_page_attr(struct page *page, int numpages, pgprot_t prot) |
| 424 | { |
| 425 | int i, err = 0; |
| 426 | unsigned long flags; |
| 427 | |
| 428 | local_irq_save(flags); |
| 429 | for (i = 0; i < numpages; i++, page++) { |
| 430 | err = __change_page_attr(page, prot); |
| 431 | if (err) |
| 432 | break; |
| 433 | } |
| 434 | local_irq_restore(flags); |
| 435 | return err; |
| 436 | } |
| 437 | |
| 438 | |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 439 | void __kernel_map_pages(struct page *page, int numpages, int enable) |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 440 | { |
| 441 | if (PageHighMem(page)) |
| 442 | return; |
| 443 | |
| 444 | change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); |
| 445 | } |
| 446 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 447 | |
| 448 | static int fixmaps; |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 449 | |
| 450 | void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) |
| 451 | { |
| 452 | unsigned long address = __fix_to_virt(idx); |
| 453 | |
| 454 | if (idx >= __end_of_fixed_addresses) { |
| 455 | BUG(); |
| 456 | return; |
| 457 | } |
| 458 | |
David Gibson | 46a7417 | 2008-05-19 16:16:00 +1000 | [diff] [blame] | 459 | map_page(address, phys, pgprot_val(flags)); |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 460 | fixmaps++; |
| 461 | } |
| 462 | |
| 463 | void __this_fixmap_does_not_exist(void) |
| 464 | { |
| 465 | WARN_ON(1); |
| 466 | } |