14f04d8f0SCatalin Marinas /* 24f04d8f0SCatalin Marinas * Copyright (C) 2012 ARM Ltd. 34f04d8f0SCatalin Marinas * 44f04d8f0SCatalin Marinas * This program is free software; you can redistribute it and/or modify 54f04d8f0SCatalin Marinas * it under the terms of the GNU General Public License version 2 as 64f04d8f0SCatalin Marinas * published by the Free Software Foundation. 74f04d8f0SCatalin Marinas * 84f04d8f0SCatalin Marinas * This program is distributed in the hope that it will be useful, 94f04d8f0SCatalin Marinas * but WITHOUT ANY WARRANTY; without even the implied warranty of 104f04d8f0SCatalin Marinas * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 114f04d8f0SCatalin Marinas * GNU General Public License for more details. 124f04d8f0SCatalin Marinas * 134f04d8f0SCatalin Marinas * You should have received a copy of the GNU General Public License 144f04d8f0SCatalin Marinas * along with this program. If not, see <http://www.gnu.org/licenses/>. 154f04d8f0SCatalin Marinas */ 164f04d8f0SCatalin Marinas #ifndef __ASM_PGTABLE_H 174f04d8f0SCatalin Marinas #define __ASM_PGTABLE_H 184f04d8f0SCatalin Marinas 194f04d8f0SCatalin Marinas #include <asm/proc-fns.h> 204f04d8f0SCatalin Marinas 214f04d8f0SCatalin Marinas #include <asm/memory.h> 224f04d8f0SCatalin Marinas #include <asm/pgtable-hwdef.h> 234f04d8f0SCatalin Marinas 244f04d8f0SCatalin Marinas /* 254f04d8f0SCatalin Marinas * Software defined PTE bits definition. 264f04d8f0SCatalin Marinas */ 27*a6fadf7eSWill Deacon #define PTE_VALID (_AT(pteval_t, 1) << 0) 28*a6fadf7eSWill Deacon #define PTE_PROT_NONE (_AT(pteval_t, 1) << 1) /* only when !PTE_VALID */ 294f04d8f0SCatalin Marinas #define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ 304f04d8f0SCatalin Marinas #define PTE_DIRTY (_AT(pteval_t, 1) << 55) 314f04d8f0SCatalin Marinas #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) 324f04d8f0SCatalin Marinas 334f04d8f0SCatalin Marinas /* 344f04d8f0SCatalin Marinas * VMALLOC and SPARSEMEM_VMEMMAP ranges. 354f04d8f0SCatalin Marinas */ 364f04d8f0SCatalin Marinas #define VMALLOC_START UL(0xffffff8000000000) 374f04d8f0SCatalin Marinas #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) 384f04d8f0SCatalin Marinas 394f04d8f0SCatalin Marinas #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 404f04d8f0SCatalin Marinas 414f04d8f0SCatalin Marinas #define FIRST_USER_ADDRESS 0 424f04d8f0SCatalin Marinas 434f04d8f0SCatalin Marinas #ifndef __ASSEMBLY__ 444f04d8f0SCatalin Marinas extern void __pte_error(const char *file, int line, unsigned long val); 454f04d8f0SCatalin Marinas extern void __pmd_error(const char *file, int line, unsigned long val); 464f04d8f0SCatalin Marinas extern void __pgd_error(const char *file, int line, unsigned long val); 474f04d8f0SCatalin Marinas 484f04d8f0SCatalin Marinas #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 494f04d8f0SCatalin Marinas #ifndef CONFIG_ARM64_64K_PAGES 504f04d8f0SCatalin Marinas #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 514f04d8f0SCatalin Marinas #endif 524f04d8f0SCatalin Marinas #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 534f04d8f0SCatalin Marinas 544f04d8f0SCatalin Marinas /* 554f04d8f0SCatalin Marinas * The pgprot_* and protection_map entries will be fixed up at runtime to 564f04d8f0SCatalin Marinas * include the cachable and bufferable bits based on memory policy, as well as 574f04d8f0SCatalin Marinas * any architecture dependent bits like global/ASID and SMP shared mapping 584f04d8f0SCatalin Marinas * bits. 594f04d8f0SCatalin Marinas */ 604f04d8f0SCatalin Marinas #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF 614f04d8f0SCatalin Marinas 624f04d8f0SCatalin Marinas extern pgprot_t pgprot_default; 634f04d8f0SCatalin Marinas 64*a6fadf7eSWill Deacon #define __pgprot_modify(prot,mask,bits) \ 65*a6fadf7eSWill Deacon __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 664f04d8f0SCatalin Marinas 67*a6fadf7eSWill Deacon #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b) 68*a6fadf7eSWill Deacon 69*a6fadf7eSWill Deacon #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE) 708e620b04SCatalin Marinas #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 718e620b04SCatalin Marinas #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) 728e620b04SCatalin Marinas #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 738e620b04SCatalin Marinas #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 748e620b04SCatalin Marinas #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 758e620b04SCatalin Marinas #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 768e620b04SCatalin Marinas #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY) 778e620b04SCatalin Marinas #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY) 784f04d8f0SCatalin Marinas 79*a6fadf7eSWill Deacon #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE) 808e620b04SCatalin Marinas #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 818e620b04SCatalin Marinas #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 828e620b04SCatalin Marinas #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 838e620b04SCatalin Marinas #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 848e620b04SCatalin Marinas #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 858e620b04SCatalin Marinas #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 864f04d8f0SCatalin Marinas 874f04d8f0SCatalin Marinas #endif /* __ASSEMBLY__ */ 884f04d8f0SCatalin Marinas 894f04d8f0SCatalin Marinas #define __P000 __PAGE_NONE 904f04d8f0SCatalin Marinas #define __P001 __PAGE_READONLY 914f04d8f0SCatalin Marinas #define __P010 __PAGE_COPY 924f04d8f0SCatalin Marinas #define __P011 __PAGE_COPY 934f04d8f0SCatalin Marinas #define __P100 __PAGE_READONLY_EXEC 944f04d8f0SCatalin Marinas #define __P101 __PAGE_READONLY_EXEC 954f04d8f0SCatalin Marinas #define __P110 __PAGE_COPY_EXEC 964f04d8f0SCatalin Marinas #define __P111 __PAGE_COPY_EXEC 974f04d8f0SCatalin Marinas 984f04d8f0SCatalin Marinas #define __S000 __PAGE_NONE 994f04d8f0SCatalin Marinas #define __S001 __PAGE_READONLY 1004f04d8f0SCatalin Marinas #define __S010 __PAGE_SHARED 1014f04d8f0SCatalin Marinas #define __S011 __PAGE_SHARED 1024f04d8f0SCatalin Marinas #define __S100 __PAGE_READONLY_EXEC 1034f04d8f0SCatalin Marinas #define __S101 __PAGE_READONLY_EXEC 1044f04d8f0SCatalin Marinas #define __S110 __PAGE_SHARED_EXEC 1054f04d8f0SCatalin Marinas #define __S111 __PAGE_SHARED_EXEC 1064f04d8f0SCatalin Marinas 1074f04d8f0SCatalin Marinas #ifndef __ASSEMBLY__ 1084f04d8f0SCatalin Marinas /* 1094f04d8f0SCatalin Marinas * ZERO_PAGE is a global shared page that is always zero: used 1104f04d8f0SCatalin Marinas * for zero-mapped memory areas etc.. 1114f04d8f0SCatalin Marinas */ 1124f04d8f0SCatalin Marinas extern struct page *empty_zero_page; 1134f04d8f0SCatalin Marinas #define ZERO_PAGE(vaddr) (empty_zero_page) 1144f04d8f0SCatalin Marinas 1154f04d8f0SCatalin Marinas #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 1164f04d8f0SCatalin Marinas 1174f04d8f0SCatalin Marinas #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 1184f04d8f0SCatalin Marinas 1194f04d8f0SCatalin Marinas #define pte_none(pte) (!pte_val(pte)) 1204f04d8f0SCatalin Marinas #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 1214f04d8f0SCatalin Marinas #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 1224f04d8f0SCatalin Marinas #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) 1234f04d8f0SCatalin Marinas 1244f04d8f0SCatalin Marinas #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 1254f04d8f0SCatalin Marinas #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 1264f04d8f0SCatalin Marinas #define pte_unmap(pte) do { } while (0) 1274f04d8f0SCatalin Marinas #define pte_unmap_nested(pte) do { } while (0) 1284f04d8f0SCatalin Marinas 1294f04d8f0SCatalin Marinas /* 1304f04d8f0SCatalin Marinas * The following only work if pte_present(). Undefined behaviour otherwise. 1314f04d8f0SCatalin Marinas */ 132*a6fadf7eSWill Deacon #define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) 1334f04d8f0SCatalin Marinas #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY) 1344f04d8f0SCatalin Marinas #define pte_young(pte) (pte_val(pte) & PTE_AF) 1354f04d8f0SCatalin Marinas #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL) 1364f04d8f0SCatalin Marinas #define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY)) 1378e620b04SCatalin Marinas #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 1384f04d8f0SCatalin Marinas 139*a6fadf7eSWill Deacon #define pte_valid_user(pte) \ 14002522463SWill Deacon ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 1414f04d8f0SCatalin Marinas 1424f04d8f0SCatalin Marinas #define PTE_BIT_FUNC(fn,op) \ 1434f04d8f0SCatalin Marinas static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } 1444f04d8f0SCatalin Marinas 1454f04d8f0SCatalin Marinas PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY); 1464f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY); 1474f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY); 1484f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY); 1494f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkold, &= ~PTE_AF); 1504f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkyoung, |= PTE_AF); 1514f04d8f0SCatalin Marinas PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL); 1524f04d8f0SCatalin Marinas 1534f04d8f0SCatalin Marinas static inline void set_pte(pte_t *ptep, pte_t pte) 1544f04d8f0SCatalin Marinas { 1554f04d8f0SCatalin Marinas *ptep = pte; 1564f04d8f0SCatalin Marinas } 1574f04d8f0SCatalin Marinas 1584f04d8f0SCatalin Marinas extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 1594f04d8f0SCatalin Marinas 1604f04d8f0SCatalin Marinas static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 1614f04d8f0SCatalin Marinas pte_t *ptep, pte_t pte) 1624f04d8f0SCatalin Marinas { 163*a6fadf7eSWill Deacon if (pte_valid_user(pte)) { 16402522463SWill Deacon if (pte_exec(pte)) 1654f04d8f0SCatalin Marinas __sync_icache_dcache(pte, addr); 16633eaa58fSCatalin Marinas if (!pte_dirty(pte)) 16733eaa58fSCatalin Marinas pte = pte_wrprotect(pte); 16802522463SWill Deacon } 16902522463SWill Deacon 1704f04d8f0SCatalin Marinas set_pte(ptep, pte); 1714f04d8f0SCatalin Marinas } 1724f04d8f0SCatalin Marinas 1734f04d8f0SCatalin Marinas /* 1744f04d8f0SCatalin Marinas * Huge pte definitions. 1754f04d8f0SCatalin Marinas */ 1764f04d8f0SCatalin Marinas #define pte_huge(pte) ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE) 1774f04d8f0SCatalin Marinas #define pte_mkhuge(pte) (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE)) 1784f04d8f0SCatalin Marinas 1794f04d8f0SCatalin Marinas #define __HAVE_ARCH_PTE_SPECIAL 1804f04d8f0SCatalin Marinas 1814f04d8f0SCatalin Marinas /* 1824f04d8f0SCatalin Marinas * Mark the prot value as uncacheable and unbufferable. 1834f04d8f0SCatalin Marinas */ 1844f04d8f0SCatalin Marinas #define pgprot_noncached(prot) \ 1854f04d8f0SCatalin Marinas __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 1864f04d8f0SCatalin Marinas #define pgprot_writecombine(prot) \ 1874f04d8f0SCatalin Marinas __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE)) 1884f04d8f0SCatalin Marinas #define pgprot_dmacoherent(prot) \ 1894f04d8f0SCatalin Marinas __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) 1904f04d8f0SCatalin Marinas #define __HAVE_PHYS_MEM_ACCESS_PROT 1914f04d8f0SCatalin Marinas struct file; 1924f04d8f0SCatalin Marinas extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 1934f04d8f0SCatalin Marinas unsigned long size, pgprot_t vma_prot); 1944f04d8f0SCatalin Marinas 1954f04d8f0SCatalin Marinas #define pmd_none(pmd) (!pmd_val(pmd)) 1964f04d8f0SCatalin Marinas #define pmd_present(pmd) (pmd_val(pmd)) 1974f04d8f0SCatalin Marinas 1984f04d8f0SCatalin Marinas #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 1994f04d8f0SCatalin Marinas 2004f04d8f0SCatalin Marinas static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 2014f04d8f0SCatalin Marinas { 2024f04d8f0SCatalin Marinas *pmdp = pmd; 2034f04d8f0SCatalin Marinas dsb(); 2044f04d8f0SCatalin Marinas } 2054f04d8f0SCatalin Marinas 2064f04d8f0SCatalin Marinas static inline void pmd_clear(pmd_t *pmdp) 2074f04d8f0SCatalin Marinas { 2084f04d8f0SCatalin Marinas set_pmd(pmdp, __pmd(0)); 2094f04d8f0SCatalin Marinas } 2104f04d8f0SCatalin Marinas 2114f04d8f0SCatalin Marinas static inline pte_t *pmd_page_vaddr(pmd_t pmd) 2124f04d8f0SCatalin Marinas { 2134f04d8f0SCatalin Marinas return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 2144f04d8f0SCatalin Marinas } 2154f04d8f0SCatalin Marinas 2164f04d8f0SCatalin Marinas #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 2174f04d8f0SCatalin Marinas 2184f04d8f0SCatalin Marinas /* 2194f04d8f0SCatalin Marinas * Conversion functions: convert a page and protection to a page entry, 2204f04d8f0SCatalin Marinas * and a page entry and page directory to the page they refer to. 2214f04d8f0SCatalin Marinas */ 2224f04d8f0SCatalin Marinas #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 2234f04d8f0SCatalin Marinas 2244f04d8f0SCatalin Marinas #ifndef CONFIG_ARM64_64K_PAGES 2254f04d8f0SCatalin Marinas 2264f04d8f0SCatalin Marinas #define pud_none(pud) (!pud_val(pud)) 2274f04d8f0SCatalin Marinas #define pud_bad(pud) (!(pud_val(pud) & 2)) 2284f04d8f0SCatalin Marinas #define pud_present(pud) (pud_val(pud)) 2294f04d8f0SCatalin Marinas 2304f04d8f0SCatalin Marinas static inline void set_pud(pud_t *pudp, pud_t pud) 2314f04d8f0SCatalin Marinas { 2324f04d8f0SCatalin Marinas *pudp = pud; 2334f04d8f0SCatalin Marinas dsb(); 2344f04d8f0SCatalin Marinas } 2354f04d8f0SCatalin Marinas 2364f04d8f0SCatalin Marinas static inline void pud_clear(pud_t *pudp) 2374f04d8f0SCatalin Marinas { 2384f04d8f0SCatalin Marinas set_pud(pudp, __pud(0)); 2394f04d8f0SCatalin Marinas } 2404f04d8f0SCatalin Marinas 2414f04d8f0SCatalin Marinas static inline pmd_t *pud_page_vaddr(pud_t pud) 2424f04d8f0SCatalin Marinas { 2434f04d8f0SCatalin Marinas return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 2444f04d8f0SCatalin Marinas } 2454f04d8f0SCatalin Marinas 2464f04d8f0SCatalin Marinas #endif /* CONFIG_ARM64_64K_PAGES */ 2474f04d8f0SCatalin Marinas 2484f04d8f0SCatalin Marinas /* to find an entry in a page-table-directory */ 2494f04d8f0SCatalin Marinas #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 2504f04d8f0SCatalin Marinas 2514f04d8f0SCatalin Marinas #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 2524f04d8f0SCatalin Marinas 2534f04d8f0SCatalin Marinas /* to find an entry in a kernel page-table-directory */ 2544f04d8f0SCatalin Marinas #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 2554f04d8f0SCatalin Marinas 2564f04d8f0SCatalin Marinas /* Find an entry in the second-level page table.. */ 2574f04d8f0SCatalin Marinas #ifndef CONFIG_ARM64_64K_PAGES 2584f04d8f0SCatalin Marinas #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 2594f04d8f0SCatalin Marinas static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 2604f04d8f0SCatalin Marinas { 2614f04d8f0SCatalin Marinas return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 2624f04d8f0SCatalin Marinas } 2634f04d8f0SCatalin Marinas #endif 2644f04d8f0SCatalin Marinas 2654f04d8f0SCatalin Marinas /* Find an entry in the third-level page table.. */ 2664f04d8f0SCatalin Marinas #define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 2674f04d8f0SCatalin Marinas 2684f04d8f0SCatalin Marinas static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 2694f04d8f0SCatalin Marinas { 270*a6fadf7eSWill Deacon const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 271*a6fadf7eSWill Deacon PTE_PROT_NONE | PTE_VALID; 2724f04d8f0SCatalin Marinas pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 2734f04d8f0SCatalin Marinas return pte; 2744f04d8f0SCatalin Marinas } 2754f04d8f0SCatalin Marinas 2764f04d8f0SCatalin Marinas extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 2774f04d8f0SCatalin Marinas extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 2784f04d8f0SCatalin Marinas 2794f04d8f0SCatalin Marinas #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) 2804f04d8f0SCatalin Marinas #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) 2814f04d8f0SCatalin Marinas 2824f04d8f0SCatalin Marinas /* 2834f04d8f0SCatalin Marinas * Encode and decode a swap entry: 2844f04d8f0SCatalin Marinas * bits 0-1: present (must be zero) 2854f04d8f0SCatalin Marinas * bit 2: PTE_FILE 2864f04d8f0SCatalin Marinas * bits 3-8: swap type 2874f04d8f0SCatalin Marinas * bits 9-63: swap offset 2884f04d8f0SCatalin Marinas */ 2894f04d8f0SCatalin Marinas #define __SWP_TYPE_SHIFT 3 2904f04d8f0SCatalin Marinas #define __SWP_TYPE_BITS 6 2914f04d8f0SCatalin Marinas #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 2924f04d8f0SCatalin Marinas #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 2934f04d8f0SCatalin Marinas 2944f04d8f0SCatalin Marinas #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 2954f04d8f0SCatalin Marinas #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 2964f04d8f0SCatalin Marinas #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 2974f04d8f0SCatalin Marinas 2984f04d8f0SCatalin Marinas #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 2994f04d8f0SCatalin Marinas #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 3004f04d8f0SCatalin Marinas 3014f04d8f0SCatalin Marinas /* 3024f04d8f0SCatalin Marinas * Ensure that there are not more swap files than can be encoded in the kernel 3034f04d8f0SCatalin Marinas * the PTEs. 3044f04d8f0SCatalin Marinas */ 3054f04d8f0SCatalin Marinas #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 3064f04d8f0SCatalin Marinas 3074f04d8f0SCatalin Marinas /* 3084f04d8f0SCatalin Marinas * Encode and decode a file entry: 3094f04d8f0SCatalin Marinas * bits 0-1: present (must be zero) 3104f04d8f0SCatalin Marinas * bit 2: PTE_FILE 3114f04d8f0SCatalin Marinas * bits 3-63: file offset / PAGE_SIZE 3124f04d8f0SCatalin Marinas */ 3134f04d8f0SCatalin Marinas #define pte_file(pte) (pte_val(pte) & PTE_FILE) 3144f04d8f0SCatalin Marinas #define pte_to_pgoff(x) (pte_val(x) >> 3) 3154f04d8f0SCatalin Marinas #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) 3164f04d8f0SCatalin Marinas 3174f04d8f0SCatalin Marinas #define PTE_FILE_MAX_BITS 61 3184f04d8f0SCatalin Marinas 3194f04d8f0SCatalin Marinas extern int kern_addr_valid(unsigned long addr); 3204f04d8f0SCatalin Marinas 3214f04d8f0SCatalin Marinas #include <asm-generic/pgtable.h> 3224f04d8f0SCatalin Marinas 3234f04d8f0SCatalin Marinas /* 3244f04d8f0SCatalin Marinas * remap a physical page `pfn' of size `size' with page protection `prot' 3254f04d8f0SCatalin Marinas * into virtual address `from' 3264f04d8f0SCatalin Marinas */ 3274f04d8f0SCatalin Marinas #define io_remap_pfn_range(vma,from,pfn,size,prot) \ 3284f04d8f0SCatalin Marinas remap_pfn_range(vma, from, pfn, size, prot) 3294f04d8f0SCatalin Marinas 3304f04d8f0SCatalin Marinas #define pgtable_cache_init() do { } while (0) 3314f04d8f0SCatalin Marinas 3324f04d8f0SCatalin Marinas #endif /* !__ASSEMBLY__ */ 3334f04d8f0SCatalin Marinas 3344f04d8f0SCatalin Marinas #endif /* __ASM_PGTABLE_H */ 335