From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/x86/include/asm/pgtable_64.h | 274 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 274 insertions(+) create mode 100644 arch/x86/include/asm/pgtable_64.h (limited to 'arch/x86/include/asm/pgtable_64.h') diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h new file mode 100644 index 000000000..07cd53eee --- /dev/null +++ b/arch/x86/include/asm/pgtable_64.h @@ -0,0 +1,274 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_PGTABLE_64_H +#define _ASM_X86_PGTABLE_64_H + +#include +#include + +#ifndef __ASSEMBLY__ + +/* + * This file contains the functions and defines necessary to modify and use + * the x86-64 page table tree. + */ +#include +#include +#include +#include + +extern p4d_t level4_kernel_pgt[512]; +extern p4d_t level4_ident_pgt[512]; +extern pud_t level3_kernel_pgt[512]; +extern pud_t level3_ident_pgt[512]; +extern pmd_t level2_kernel_pgt[512]; +extern pmd_t level2_fixmap_pgt[512]; +extern pmd_t level2_ident_pgt[512]; +extern pte_t level1_fixmap_pgt[512 * FIXMAP_PMD_NUM]; +extern pgd_t init_top_pgt[]; + +#define swapper_pg_dir init_top_pgt + +extern void paging_init(void); +static inline void sync_initial_page_table(void) { } + +#define pte_ERROR(e) \ + pr_err("%s:%d: bad pte %p(%016lx)\n", \ + __FILE__, __LINE__, &(e), pte_val(e)) +#define pmd_ERROR(e) \ + pr_err("%s:%d: bad pmd %p(%016lx)\n", \ + __FILE__, __LINE__, &(e), pmd_val(e)) +#define pud_ERROR(e) \ + pr_err("%s:%d: bad pud %p(%016lx)\n", \ + __FILE__, __LINE__, &(e), pud_val(e)) + +#if CONFIG_PGTABLE_LEVELS >= 5 +#define p4d_ERROR(e) \ + pr_err("%s:%d: bad p4d %p(%016lx)\n", \ + __FILE__, __LINE__, &(e), p4d_val(e)) +#endif + +#define pgd_ERROR(e) \ + pr_err("%s:%d: bad pgd %p(%016lx)\n", \ + __FILE__, __LINE__, &(e), pgd_val(e)) + +struct mm_struct; + +#define mm_p4d_folded mm_p4d_folded +static inline bool mm_p4d_folded(struct mm_struct *mm) +{ + return !pgtable_l5_enabled(); +} + +void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte); +void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte); + +static inline void native_set_pte(pte_t *ptep, pte_t pte) +{ + WRITE_ONCE(*ptep, pte); +} + +static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + native_set_pte(ptep, native_make_pte(0)); +} + +static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) +{ + native_set_pte(ptep, pte); +} + +static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) +{ + WRITE_ONCE(*pmdp, pmd); +} + +static inline void native_pmd_clear(pmd_t *pmd) +{ + native_set_pmd(pmd, native_make_pmd(0)); +} + +static inline pte_t native_ptep_get_and_clear(pte_t *xp) +{ +#ifdef CONFIG_SMP + return native_make_pte(xchg(&xp->pte, 0)); +#else + /* native_local_ptep_get_and_clear, + but duplicated because of cyclic dependency */ + pte_t ret = *xp; + native_pte_clear(NULL, 0, xp); + return ret; +#endif +} + +static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) +{ +#ifdef CONFIG_SMP + return native_make_pmd(xchg(&xp->pmd, 0)); +#else + /* native_local_pmdp_get_and_clear, + but duplicated because of cyclic dependency */ + pmd_t ret = *xp; + native_pmd_clear(xp); + return ret; +#endif +} + +static inline void native_set_pud(pud_t *pudp, pud_t pud) +{ + WRITE_ONCE(*pudp, pud); +} + +static inline void native_pud_clear(pud_t *pud) +{ + native_set_pud(pud, native_make_pud(0)); +} + +static inline pud_t native_pudp_get_and_clear(pud_t *xp) +{ +#ifdef CONFIG_SMP + return native_make_pud(xchg(&xp->pud, 0)); +#else + /* native_local_pudp_get_and_clear, + * but duplicated because of cyclic dependency + */ + pud_t ret = *xp; + + native_pud_clear(xp); + return ret; +#endif +} + +static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d) +{ + pgd_t pgd; + + if (pgtable_l5_enabled() || !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) { + WRITE_ONCE(*p4dp, p4d); + return; + } + + pgd = native_make_pgd(native_p4d_val(p4d)); + pgd = pti_set_user_pgtbl((pgd_t *)p4dp, pgd); + WRITE_ONCE(*p4dp, native_make_p4d(native_pgd_val(pgd))); +} + +static inline void native_p4d_clear(p4d_t *p4d) +{ + native_set_p4d(p4d, native_make_p4d(0)); +} + +static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd) +{ + WRITE_ONCE(*pgdp, pti_set_user_pgtbl(pgdp, pgd)); +} + +static inline void native_pgd_clear(pgd_t *pgd) +{ + native_set_pgd(pgd, native_make_pgd(0)); +} + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ + +/* PGD - Level 4 access */ + +/* PUD - Level 3 access */ + +/* PMD - Level 2 access */ + +/* PTE - Level 1 access */ + +/* + * Encode and de-code a swap entry + * + * | ... | 11| 10| 9|8|7|6|5| 4| 3|2| 1|0| <- bit number + * | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names + * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| E|F|SD|0| <- swp entry + * + * G (8) is aliased and used as a PROT_NONE indicator for + * !present ptes. We need to start storing swap entries above + * there. We also need to avoid using A and D because of an + * erratum where they can be incorrectly set by hardware on + * non-present PTEs. + * + * SD Bits 1-4 are not used in non-present format and available for + * special use described below: + * + * SD (1) in swp entry is used to store soft dirty bit, which helps us + * remember soft dirty over page migration + * + * F (2) in swp entry is used to record when a pagetable is + * writeprotected by userfaultfd WP support. + * + * E (3) in swp entry is used to rememeber PG_anon_exclusive. + * + * Bit 7 in swp entry should be 0 because pmd_present checks not only P, + * but also L and G. + * + * The offset is inverted by a binary not operation to make the high + * physical bits set. + */ +#define SWP_TYPE_BITS 5 + +#define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1) + +/* We always extract/encode the offset by shifting it all the way up, and then down again */ +#define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS) + +#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) + +/* Extract the high bits for type */ +#define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS)) + +/* Shift up (to get rid of type), then down to get value */ +#define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT) + +/* + * Shift the offset up "too far" by TYPE bits, then down again + * The offset is inverted by a binary not operation to make the high + * physical bits set. + */ +#define __swp_entry(type, offset) ((swp_entry_t) { \ + (~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \ + | ((unsigned long)(type) << (64-SWP_TYPE_BITS)) }) + +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) +#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val((pmd)) }) +#define __swp_entry_to_pte(x) (__pte((x).val)) +#define __swp_entry_to_pmd(x) (__pmd((x).val)) + +extern int kern_addr_valid(unsigned long addr); +extern void cleanup_highmap(void); + +#define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN + +#define PAGE_AGP PAGE_KERNEL_NOCACHE +#define HAVE_PAGE_AGP 1 + +/* fs/proc/kcore.c */ +#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK) +#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK) + +#define __HAVE_ARCH_PTE_SAME + +#define vmemmap ((struct page *)VMEMMAP_START) + +extern void init_extra_mapping_uc(unsigned long phys, unsigned long size); +extern void init_extra_mapping_wb(unsigned long phys, unsigned long size); + +#define gup_fast_permitted gup_fast_permitted +static inline bool gup_fast_permitted(unsigned long start, unsigned long end) +{ + if (end >> __VIRTUAL_MASK_SHIFT) + return false; + return true; +} + +#include + +#endif /* !__ASSEMBLY__ */ +#endif /* _ASM_X86_PGTABLE_64_H */ -- cgit v1.2.3