1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle 7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. 8 */ 9#ifndef _ASM_PGTABLE_64_H 10#define _ASM_PGTABLE_64_H 11 12#include <linux/compiler.h> 13#include <linux/linkage.h> 14 15#include <asm/addrspace.h> 16#include <asm/page.h> 17#include <asm/cachectl.h> 18#include <asm/fixmap.h> 19 20#if CONFIG_PGTABLE_LEVELS == 2 21#include <asm-generic/pgtable-nopmd.h> 22#elif CONFIG_PGTABLE_LEVELS == 3 23#include <asm-generic/pgtable-nopud.h> 24#else 25#include <asm-generic/pgtable-nop4d.h> 26#endif 27 28/* 29 * Each address space has 2 4K pages as its page directory, giving 1024 30 * (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a 31 * single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page 32 * tables. Each page table is also a single 4K page, giving 512 (== 33 * PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to 34 * invalid_pmd_table, each pmd entry is initialized to point to 35 * invalid_pte_table, each pte is initialized to 0. 36 * 37 * Kernel mappings: kernel mappings are held in the swapper_pg_table. 38 * The layout is identical to userspace except it's indexed with the 39 * fault address - VMALLOC_START. 40 */ 41 42 43/* PGDIR_SHIFT determines what a third-level page table entry can map */ 44#ifdef __PAGETABLE_PMD_FOLDED 45#define PGDIR_SHIFT (PAGE_SHIFT + PAGE_SHIFT + PTE_ORDER - 3) 46#else 47 48/* PMD_SHIFT determines the size of the area a second-level page table can map */ 49#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3)) 50#define PMD_SIZE (1UL << PMD_SHIFT) 51#define PMD_MASK (~(PMD_SIZE-1)) 52 53# ifdef __PAGETABLE_PUD_FOLDED 54# define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) 55# endif 56#endif 57 58#ifndef __PAGETABLE_PUD_FOLDED 59#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) 60#define PUD_SIZE (1UL << PUD_SHIFT) 61#define PUD_MASK (~(PUD_SIZE-1)) 62#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3)) 63#endif 64 65#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 66#define PGDIR_MASK (~(PGDIR_SIZE-1)) 67 68/* 69 * For 4kB page size we use a 3 level page tree and an 8kB pud, which 70 * permits us mapping 40 bits of virtual address space. 71 * 72 * We used to implement 41 bits by having an order 1 pmd level but that seemed 73 * rather pointless. 74 * 75 * For 8kB page size we use a 3 level page tree which permits a total of 76 * 8TB of address space. Alternatively a 33-bit / 8GB organization using 77 * two levels would be easy to implement. 78 * 79 * For 16kB page size we use a 2 level page tree which permits a total of 80 * 36 bits of virtual address space. We could add a third level but it seems 81 * like at the moment there's no need for this. 82 * 83 * For 64kB page size we use a 2 level page table tree for a total of 42 bits 84 * of virtual address space. 85 */ 86#ifdef CONFIG_PAGE_SIZE_4KB 87# ifdef CONFIG_MIPS_VA_BITS_48 88# define PGD_ORDER 0 89# define PUD_ORDER 0 90# else 91# define PGD_ORDER 1 92# define PUD_ORDER aieeee_attempt_to_allocate_pud 93# endif 94#define PMD_ORDER 0 95#define PTE_ORDER 0 96#endif 97#ifdef CONFIG_PAGE_SIZE_8KB 98#define PGD_ORDER 0 99#define PUD_ORDER aieeee_attempt_to_allocate_pud 100#define PMD_ORDER 0 101#define PTE_ORDER 0 102#endif 103#ifdef CONFIG_PAGE_SIZE_16KB 104#ifdef CONFIG_MIPS_VA_BITS_48 105#define PGD_ORDER 1 106#else 107#define PGD_ORDER 0 108#endif 109#define PUD_ORDER aieeee_attempt_to_allocate_pud 110#define PMD_ORDER 0 111#define PTE_ORDER 0 112#endif 113#ifdef CONFIG_PAGE_SIZE_32KB 114#define PGD_ORDER 0 115#define PUD_ORDER aieeee_attempt_to_allocate_pud 116#define PMD_ORDER 0 117#define PTE_ORDER 0 118#endif 119#ifdef CONFIG_PAGE_SIZE_64KB 120#define PGD_ORDER 0 121#define PUD_ORDER aieeee_attempt_to_allocate_pud 122#ifdef CONFIG_MIPS_VA_BITS_48 123#define PMD_ORDER 0 124#else 125#define PMD_ORDER aieeee_attempt_to_allocate_pmd 126#endif 127#define PTE_ORDER 0 128#endif 129 130#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) 131#ifndef __PAGETABLE_PUD_FOLDED 132#define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) / sizeof(pud_t)) 133#endif 134#ifndef __PAGETABLE_PMD_FOLDED 135#define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) / sizeof(pmd_t)) 136#endif 137#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) 138 139#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 140#define FIRST_USER_ADDRESS 0UL 141 142/* 143 * TLB refill handlers also map the vmalloc area into xuseg. Avoid 144 * the first couple of pages so NULL pointer dereferences will still 145 * reliably trap. 146 */ 147#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE)) 148#define VMALLOC_END \ 149 (MAP_BASE + \ 150 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \ 151 (1UL << cpu_vmbits)) - (1UL << 32)) 152 153#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \ 154 VMALLOC_START != CKSSEG 155/* Load modules into 32bit-compatible segment. */ 156#define MODULE_START CKSSEG 157#define MODULE_END (FIXADDR_START-2*PAGE_SIZE) 158#endif 159 160#define pte_ERROR(e) \ 161 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 162#ifndef __PAGETABLE_PMD_FOLDED 163#define pmd_ERROR(e) \ 164 printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 165#endif 166#ifndef __PAGETABLE_PUD_FOLDED 167#define pud_ERROR(e) \ 168 printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 169#endif 170#define pgd_ERROR(e) \ 171 printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 172 173extern pte_t invalid_pte_table[PTRS_PER_PTE]; 174 175#ifndef __PAGETABLE_PUD_FOLDED 176/* 177 * For 4-level pagetables we defines these ourselves, for 3-level the 178 * definitions are below, for 2-level the 179 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 180 */ 181typedef struct { unsigned long pud; } pud_t; 182#define pud_val(x) ((x).pud) 183#define __pud(x) ((pud_t) { (x) }) 184 185extern pud_t invalid_pud_table[PTRS_PER_PUD]; 186 187/* 188 * Empty pgd entries point to the invalid_pud_table. 189 */ 190static inline int p4d_none(p4d_t p4d) 191{ 192 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 193} 194 195static inline int p4d_bad(p4d_t p4d) 196{ 197 if (unlikely(p4d_val(p4d) & ~PAGE_MASK)) 198 return 1; 199 200 return 0; 201} 202 203static inline int p4d_present(p4d_t p4d) 204{ 205 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 206} 207 208static inline void p4d_clear(p4d_t *p4dp) 209{ 210 p4d_val(*p4dp) = (unsigned long)invalid_pud_table; 211} 212 213static inline pud_t *p4d_pgtable(p4d_t p4d) 214{ 215 return (pud_t *)p4d_val(p4d); 216} 217 218#define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d)) 219#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 220 221#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1)) 222 223static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 224{ 225 *p4d = p4dval; 226} 227 228#endif 229 230#ifndef __PAGETABLE_PMD_FOLDED 231/* 232 * For 3-level pagetables we defines these ourselves, for 2-level the 233 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 234 */ 235typedef struct { unsigned long pmd; } pmd_t; 236#define pmd_val(x) ((x).pmd) 237#define __pmd(x) ((pmd_t) { (x) } ) 238 239 240extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 241#endif 242 243/* 244 * Empty pgd/pmd entries point to the invalid_pte_table. 245 */ 246static inline int pmd_none(pmd_t pmd) 247{ 248 return pmd_val(pmd) == (unsigned long) invalid_pte_table; 249} 250 251static inline int pmd_bad(pmd_t pmd) 252{ 253#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 254 /* pmd_huge(pmd) but inline */ 255 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 256 return 0; 257#endif 258 259 if (unlikely(pmd_val(pmd) & ~PAGE_MASK)) 260 return 1; 261 262 return 0; 263} 264 265static inline int pmd_present(pmd_t pmd) 266{ 267#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 268 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 269 return pmd_val(pmd) & _PAGE_PRESENT; 270#endif 271 272 return pmd_val(pmd) != (unsigned long) invalid_pte_table; 273} 274 275static inline void pmd_clear(pmd_t *pmdp) 276{ 277 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); 278} 279#ifndef __PAGETABLE_PMD_FOLDED 280 281/* 282 * Empty pud entries point to the invalid_pmd_table. 283 */ 284static inline int pud_none(pud_t pud) 285{ 286 return pud_val(pud) == (unsigned long) invalid_pmd_table; 287} 288 289static inline int pud_bad(pud_t pud) 290{ 291 return pud_val(pud) & ~PAGE_MASK; 292} 293 294static inline int pud_present(pud_t pud) 295{ 296 return pud_val(pud) != (unsigned long) invalid_pmd_table; 297} 298 299static inline void pud_clear(pud_t *pudp) 300{ 301 pud_val(*pudp) = ((unsigned long) invalid_pmd_table); 302} 303#endif 304 305#define pte_page(x) pfn_to_page(pte_pfn(x)) 306 307#ifdef CONFIG_CPU_VR41XX 308#define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2))) 309#define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot)) 310#else 311#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT)) 312#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 313#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 314#endif 315 316#ifndef __PAGETABLE_PMD_FOLDED 317static inline pmd_t *pud_pgtable(pud_t pud) 318{ 319 return (pmd_t *)pud_val(pud); 320} 321#define pud_phys(pud) virt_to_phys((void *)pud_val(pud)) 322#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 323 324#endif 325 326/* 327 * Initialize a new pgd / pmd table with invalid pointers. 328 */ 329extern void pgd_init(unsigned long page); 330extern void pud_init(unsigned long page, unsigned long pagetable); 331extern void pmd_init(unsigned long page, unsigned long pagetable); 332 333/* 334 * Non-present pages: high 40 bits are offset, next 8 bits type, 335 * low 16 bits zero. 336 */ 337static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 338{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } 339 340#define __swp_type(x) (((x).val >> 16) & 0xff) 341#define __swp_offset(x) ((x).val >> 24) 342#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 343#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 344#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 345 346#endif /* _ASM_PGTABLE_64_H */ 347