1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H 3#define _ASM_POWERPC_NOHASH_64_PGTABLE_H 4/* 5 * This file contains the functions and defines necessary to modify and use 6 * the ppc64 non-hashed page table. 7 */ 8 9#include <linux/sizes.h> 10 11#include <asm/nohash/64/pgtable-4k.h> 12#include <asm/barrier.h> 13#include <asm/asm-const.h> 14 15/* 16 * Size of EA range mapped by our pagetables. 17 */ 18#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \ 19 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT) 20#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE) 21 22#define PMD_CACHE_INDEX PMD_INDEX_SIZE 23#define PUD_CACHE_INDEX PUD_INDEX_SIZE 24 25/* 26 * Define the address range of the kernel non-linear virtual area 27 */ 28#define KERN_VIRT_START ASM_CONST(0xc000100000000000) 29#define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000) 30 31/* 32 * The vmalloc space starts at the beginning of that region, and 33 * occupies a quarter of it on Book3E 34 * (we keep a quarter for the virtual memmap) 35 */ 36#define VMALLOC_START KERN_VIRT_START 37#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2) 38#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 39 40/* 41 * The third quarter of the kernel virtual space is used for IO mappings, 42 * it's itself carved into the PIO region (ISA and PHB IO space) and 43 * the ioremap space 44 * 45 * ISA_IO_BASE = KERN_IO_START, 64K reserved area 46 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces 47 * IOREMAP_BASE = ISA_IO_BASE + 2G to KERN_IO_START + KERN_IO_SIZE 48 */ 49#define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1)) 50#define KERN_IO_SIZE (KERN_VIRT_SIZE >> 2) 51#define FULL_IO_SIZE 0x80000000ul 52#define ISA_IO_BASE (KERN_IO_START) 53#define ISA_IO_END (KERN_IO_START + 0x10000ul) 54#define PHB_IO_BASE (ISA_IO_END) 55#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) 56#define IOREMAP_BASE (PHB_IO_END) 57#define IOREMAP_START (ioremap_bot) 58#define IOREMAP_END (KERN_IO_START + KERN_IO_SIZE - FIXADDR_SIZE) 59#define FIXADDR_SIZE SZ_32M 60 61/* 62 * Defines the address of the vmemap area, in its own region on 63 * after the vmalloc space on Book3E 64 */ 65#define VMEMMAP_BASE VMALLOC_END 66#define VMEMMAP_END KERN_IO_START 67#define vmemmap ((struct page *)VMEMMAP_BASE) 68 69 70/* 71 * Include the PTE bits definitions 72 */ 73#include <asm/nohash/pte-e500.h> 74 75#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) 76 77/* 78 * _PAGE_CHG_MASK masks of bits that are to be preserved across 79 * pgprot changes. 80 */ 81#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) 82 83#define H_PAGE_4K_PFN 0 84 85#ifndef __ASSEMBLY__ 86/* pte_clear moved to later in this file */ 87 88static inline pte_t pte_mkwrite_novma(pte_t pte) 89{ 90 return __pte(pte_val(pte) | _PAGE_RW); 91} 92 93static inline pte_t pte_mkdirty(pte_t pte) 94{ 95 return __pte(pte_val(pte) | _PAGE_DIRTY); 96} 97 98static inline pte_t pte_mkyoung(pte_t pte) 99{ 100 return __pte(pte_val(pte) | _PAGE_ACCESSED); 101} 102 103static inline pte_t pte_wrprotect(pte_t pte) 104{ 105 return __pte(pte_val(pte) & ~_PAGE_RW); 106} 107 108#define PMD_BAD_BITS (PTE_TABLE_SIZE-1) 109#define PUD_BAD_BITS (PMD_TABLE_SIZE-1) 110 111static inline void pmd_set(pmd_t *pmdp, unsigned long val) 112{ 113 *pmdp = __pmd(val); 114} 115 116static inline void pmd_clear(pmd_t *pmdp) 117{ 118 *pmdp = __pmd(0); 119} 120 121static inline pte_t pmd_pte(pmd_t pmd) 122{ 123 return __pte(pmd_val(pmd)); 124} 125 126#define pmd_none(pmd) (!pmd_val(pmd)) 127#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ 128 || (pmd_val(pmd) & PMD_BAD_BITS)) 129#define pmd_present(pmd) (!pmd_none(pmd)) 130#define pmd_page_vaddr(pmd) ((const void *)(pmd_val(pmd) & ~PMD_MASKED_BITS)) 131extern struct page *pmd_page(pmd_t pmd); 132#define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd))) 133 134static inline void pud_set(pud_t *pudp, unsigned long val) 135{ 136 *pudp = __pud(val); 137} 138 139static inline void pud_clear(pud_t *pudp) 140{ 141 *pudp = __pud(0); 142} 143 144#define pud_none(pud) (!pud_val(pud)) 145#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ 146 || (pud_val(pud) & PUD_BAD_BITS)) 147#define pud_present(pud) (pud_val(pud) != 0) 148 149static inline pmd_t *pud_pgtable(pud_t pud) 150{ 151 return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS); 152} 153 154extern struct page *pud_page(pud_t pud); 155 156static inline pte_t pud_pte(pud_t pud) 157{ 158 return __pte(pud_val(pud)); 159} 160 161static inline pud_t pte_pud(pte_t pte) 162{ 163 return __pud(pte_val(pte)); 164} 165#define pud_write(pud) pte_write(pud_pte(pud)) 166#define p4d_write(pgd) pte_write(p4d_pte(p4d)) 167 168static inline void p4d_set(p4d_t *p4dp, unsigned long val) 169{ 170 *p4dp = __p4d(val); 171} 172 173/* Atomic PTE updates */ 174static inline unsigned long pte_update(struct mm_struct *mm, 175 unsigned long addr, 176 pte_t *ptep, unsigned long clr, 177 unsigned long set, 178 int huge) 179{ 180 unsigned long old = pte_val(*ptep); 181 *ptep = __pte((old & ~clr) | set); 182 183 /* huge pages use the old page table lock */ 184 if (!huge) 185 assert_pte_locked(mm, addr); 186 187 return old; 188} 189 190static inline int pte_young(pte_t pte) 191{ 192 return pte_val(pte) & _PAGE_ACCESSED; 193} 194 195static inline int __ptep_test_and_clear_young(struct mm_struct *mm, 196 unsigned long addr, pte_t *ptep) 197{ 198 unsigned long old; 199 200 if (!pte_young(*ptep)) 201 return 0; 202 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); 203 return (old & _PAGE_ACCESSED) != 0; 204} 205#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 206#define ptep_test_and_clear_young(__vma, __addr, __ptep) \ 207({ \ 208 int __r; \ 209 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ 210 __r; \ 211}) 212 213#define __HAVE_ARCH_PTEP_SET_WRPROTECT 214static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 215 pte_t *ptep) 216{ 217 218 if ((pte_val(*ptep) & _PAGE_RW) == 0) 219 return; 220 221 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0); 222} 223 224#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 225static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 226 unsigned long addr, pte_t *ptep) 227{ 228 if ((pte_val(*ptep) & _PAGE_RW) == 0) 229 return; 230 231 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1); 232} 233 234#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 235#define ptep_clear_flush_young(__vma, __address, __ptep) \ 236({ \ 237 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ 238 __ptep); \ 239 __young; \ 240}) 241 242#define __HAVE_ARCH_PTEP_GET_AND_CLEAR 243static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 244 unsigned long addr, pte_t *ptep) 245{ 246 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); 247 return __pte(old); 248} 249 250static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 251 pte_t * ptep) 252{ 253 pte_update(mm, addr, ptep, ~0UL, 0, 0); 254} 255 256 257/* Set the dirty and/or accessed bits atomically in a linux PTE */ 258static inline void __ptep_set_access_flags(struct vm_area_struct *vma, 259 pte_t *ptep, pte_t entry, 260 unsigned long address, 261 int psize) 262{ 263 unsigned long bits = pte_val(entry) & 264 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); 265 266 unsigned long old = pte_val(*ptep); 267 *ptep = __pte(old | bits); 268 269 flush_tlb_page(vma, address); 270} 271 272#define pte_ERROR(e) \ 273 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 274#define pmd_ERROR(e) \ 275 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 276#define pgd_ERROR(e) \ 277 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 278 279/* 280 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 281 * are !pte_none() && !pte_present(). 282 * 283 * Format of swap PTEs: 284 * 285 * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 286 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 287 * <-------------------------- offset ---------------------------- 288 * 289 * 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6 290 * 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 291 * --------------> <----------- zero ------------> E < type -> 0 0 292 * 293 * E is the exclusive marker that is not stored in swap entries. 294 */ 295#define MAX_SWAPFILES_CHECK() do { \ 296 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 297 } while (0) 298 299#define SWP_TYPE_BITS 5 300#define __swp_type(x) (((x).val >> 2) \ 301 & ((1UL << SWP_TYPE_BITS) - 1)) 302#define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 303#define __swp_entry(type, offset) ((swp_entry_t) { \ 304 (((type) & 0x1f) << 2) \ 305 | ((offset) << PTE_RPN_SHIFT) }) 306 307#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 308#define __swp_entry_to_pte(x) __pte((x).val) 309 310/* We borrow MSB 56 (LSB 7) to store the exclusive marker in swap PTEs. */ 311#define _PAGE_SWP_EXCLUSIVE 0x80 312 313int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); 314void unmap_kernel_page(unsigned long va); 315extern int __meminit vmemmap_create_mapping(unsigned long start, 316 unsigned long page_size, 317 unsigned long phys); 318extern void vmemmap_remove_mapping(unsigned long start, 319 unsigned long page_size); 320void __patch_exception(int exc, unsigned long addr); 321#define patch_exception(exc, name) do { \ 322 extern unsigned int name; \ 323 __patch_exception((exc), (unsigned long)&name); \ 324} while (0) 325 326#endif /* __ASSEMBLY__ */ 327 328#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */ 329