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#define FIXADDR_TOP (IOREMAP_END + FIXADDR_SIZE) 61 62/* 63 * Defines the address of the vmemap area, in its own region on 64 * after the vmalloc space on Book3E 65 */ 66#define VMEMMAP_BASE VMALLOC_END 67#define VMEMMAP_END KERN_IO_START 68#define vmemmap ((struct page *)VMEMMAP_BASE) 69 70 71/* 72 * Include the PTE bits definitions 73 */ 74#include <asm/nohash/pte-e500.h> 75 76#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) 77 78#define H_PAGE_4K_PFN 0 79 80#ifndef __ASSEMBLY__ 81/* pte_clear moved to later in this file */ 82 83#define PMD_BAD_BITS (PTE_TABLE_SIZE-1) 84#define PUD_BAD_BITS (PMD_TABLE_SIZE-1) 85 86static inline void pmd_set(pmd_t *pmdp, unsigned long val) 87{ 88 *pmdp = __pmd(val); 89} 90 91static inline void pmd_clear(pmd_t *pmdp) 92{ 93 *pmdp = __pmd(0); 94} 95 96static inline pte_t pmd_pte(pmd_t pmd) 97{ 98 return __pte(pmd_val(pmd)); 99} 100 101#define pmd_none(pmd) (!pmd_val(pmd)) 102#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ 103 || (pmd_val(pmd) & PMD_BAD_BITS)) 104#define pmd_present(pmd) (!pmd_none(pmd)) 105#define pmd_page_vaddr(pmd) ((const void *)(pmd_val(pmd) & ~PMD_MASKED_BITS)) 106extern struct page *pmd_page(pmd_t pmd); 107#define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd))) 108 109static inline void pud_set(pud_t *pudp, unsigned long val) 110{ 111 *pudp = __pud(val); 112} 113 114static inline void pud_clear(pud_t *pudp) 115{ 116 *pudp = __pud(0); 117} 118 119#define pud_none(pud) (!pud_val(pud)) 120#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ 121 || (pud_val(pud) & PUD_BAD_BITS)) 122#define pud_present(pud) (pud_val(pud) != 0) 123 124static inline pmd_t *pud_pgtable(pud_t pud) 125{ 126 return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS); 127} 128 129extern struct page *pud_page(pud_t pud); 130 131static inline pte_t pud_pte(pud_t pud) 132{ 133 return __pte(pud_val(pud)); 134} 135 136static inline pud_t pte_pud(pte_t pte) 137{ 138 return __pud(pte_val(pte)); 139} 140#define pud_write(pud) pte_write(pud_pte(pud)) 141#define p4d_write(pgd) pte_write(p4d_pte(p4d)) 142 143static inline void p4d_set(p4d_t *p4dp, unsigned long val) 144{ 145 *p4dp = __p4d(val); 146} 147 148#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 149static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 150 unsigned long addr, pte_t *ptep) 151{ 152 pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 1); 153} 154 155#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 156#define ptep_clear_flush_young(__vma, __address, __ptep) \ 157({ \ 158 int __young = ptep_test_and_clear_young(__vma, __address, __ptep);\ 159 __young; \ 160}) 161 162#define pmd_ERROR(e) \ 163 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 164#define pgd_ERROR(e) \ 165 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 166 167/* 168 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 169 * are !pte_none() && !pte_present(). 170 * 171 * Format of swap PTEs: 172 * 173 * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 174 * 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 1 175 * <-------------------------- offset ---------------------------- 176 * 177 * 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 6 178 * 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 3 179 * --------------> <----------- zero ------------> E < type -> 0 0 180 * 181 * E is the exclusive marker that is not stored in swap entries. 182 */ 183#define MAX_SWAPFILES_CHECK() do { \ 184 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 185 } while (0) 186 187#define SWP_TYPE_BITS 5 188#define __swp_type(x) (((x).val >> 2) \ 189 & ((1UL << SWP_TYPE_BITS) - 1)) 190#define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 191#define __swp_entry(type, offset) ((swp_entry_t) { \ 192 (((type) & 0x1f) << 2) \ 193 | ((offset) << PTE_RPN_SHIFT) }) 194 195#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 196#define __swp_entry_to_pte(x) __pte((x).val) 197 198/* We borrow MSB 56 (LSB 7) to store the exclusive marker in swap PTEs. */ 199#define _PAGE_SWP_EXCLUSIVE 0x80 200 201extern int __meminit vmemmap_create_mapping(unsigned long start, 202 unsigned long page_size, 203 unsigned long phys); 204extern void vmemmap_remove_mapping(unsigned long start, 205 unsigned long page_size); 206void __patch_exception(int exc, unsigned long addr); 207#define patch_exception(exc, name) do { \ 208 extern unsigned int name; \ 209 __patch_exception((exc), (unsigned long)&name); \ 210} while (0) 211 212#endif /* __ASSEMBLY__ */ 213 214#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */ 215