Release 4.14 arch/x86/include/asm/pgtable_32.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PGTABLE_32_H
#define _ASM_X86_PGTABLE_32_H
#include <asm/pgtable_32_types.h>
/*
* The Linux memory management assumes a three-level page table setup. On
* the i386, we use that, but "fold" the mid level into the top-level page
* table, so that we physically have the same two-level page table as the
* i386 mmu expects.
*
* This file contains the functions and defines necessary to modify and use
* the i386 page table tree.
*/
#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <linux/threads.h>
#include <asm/paravirt.h>
#include <linux/bitops.h>
#include <linux/list.h>
#include <linux/spinlock.h>
struct mm_struct;
struct vm_area_struct;
extern pgd_t swapper_pg_dir[1024];
extern pgd_t initial_page_table[1024];
extern pmd_t initial_pg_pmd[];
static inline void pgtable_cache_init(void) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 4 | 50.00% | 1 | 33.33% |
| Andrew Morton | 3 | 37.50% | 1 | 33.33% |
| Linus Torvalds (pre-git) | 1 | 12.50% | 1 | 33.33% |
| Total | 8 | 100.00% | 3 | 100.00% |
static inline void check_pgt_cache(void) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Morton | 4 | 50.00% | 2 | 50.00% |
| Jeremy Fitzhardinge | 2 | 25.00% | 1 | 25.00% |
| Thomas Gleixner | 2 | 25.00% | 1 | 25.00% |
| Total | 8 | 100.00% | 4 | 100.00% |
void paging_init(void);
/*
* Define this if things work differently on an i386 and an i486:
* it will (on an i486) warn about kernel memory accesses that are
* done without a 'access_ok(VERIFY_WRITE,..)'
*/
#undef TEST_ACCESS_OK
#ifdef CONFIG_X86_PAE
# include <asm/pgtable-3level.h>
#else
# include <asm/pgtable-2level.h>
#endif
#if defined(CONFIG_HIGHPTE)
#define pte_offset_map(dir, address) \
((pte_t *)kmap_atomic(pmd_page(*(dir))) + \
pte_index((address)))
#define pte_unmap(pte) kunmap_atomic((pte))
#else
#define pte_offset_map(dir, address) \
((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
#define pte_unmap(pte) do { } while (0)
#endif
/* Clear a kernel PTE and flush it from the TLB */
#define kpte_clear_flush(ptep, vaddr) \
do { \
pte_clear(&init_mm, (vaddr), (ptep)); \
__flush_tlb_one((vaddr)); \
} while (0)
#endif /* !__ASSEMBLY__ */
/*
* kern_addr_valid() is (1) for FLATMEM and (0) for
* SPARSEMEM and DISCONTIGMEM
*/
#ifdef CONFIG_FLATMEM
#define kern_addr_valid(addr) (1)
#else
#define kern_addr_valid(kaddr) (0)
#endif
/*
* This is how much memory in addition to the memory covered up to
* and including _end we need mapped initially.
* We need:
* (KERNEL_IMAGE_SIZE/4096) / 1024 pages (worst case, non PAE)
* (KERNEL_IMAGE_SIZE/4096) / 512 + 4 pages (worst case for PAE)
*
* Modulo rounding, each megabyte assigned here requires a kilobyte of
* memory, which is currently unreclaimed.
*
* This should be a multiple of a page.
*
* KERNEL_IMAGE_SIZE should be greater than pa(_end)
* and small than max_low_pfn, otherwise will waste some page table entries
*/
#if PTRS_PER_PMD > 1
#define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD)
#else
#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
#endif
/*
* Number of possible pages in the lowmem region.
*
* We shift 2 by 31 instead of 1 by 32 to the left in order to avoid a
* gas warning about overflowing shift count when gas has been compiled
* with only a host target support using a 32-bit type for internal
* representation.
*/
#define LOWMEM_PAGES ((((2<<31) - __PAGE_OFFSET) >> PAGE_SHIFT))
#endif /* _ASM_X86_PGTABLE_32_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Morton | 47 | 22.60% | 4 | 12.90% |
| Linus Torvalds (pre-git) | 38 | 18.27% | 8 | 25.81% |
| Boris Ostrovsky | 34 | 16.35% | 1 | 3.23% |
| Ingo Molnar | 28 | 13.46% | 2 | 6.45% |
| Thomas Gleixner | 16 | 7.69% | 2 | 6.45% |
| Zachary Amsden | 10 | 4.81% | 1 | 3.23% |
| Joerg Roedel | 6 | 2.88% | 1 | 3.23% |
| Tim Schmielau | 6 | 2.88% | 1 | 3.23% |
| Jeremy Fitzhardinge | 5 | 2.40% | 2 | 6.45% |
| Andy Whitcroft | 3 | 1.44% | 1 | 3.23% |
| Rusty Russell | 3 | 1.44% | 1 | 3.23% |
| H. Peter Anvin | 3 | 1.44% | 1 | 3.23% |
| Jesper Juhl | 2 | 0.96% | 1 | 3.23% |
| Peter Zijlstra | 2 | 0.96% | 1 | 3.23% |
| Joe Perches | 2 | 0.96% | 1 | 3.23% |
| Borislav Petkov | 1 | 0.48% | 1 | 3.23% |
| Jiri Slaby | 1 | 0.48% | 1 | 3.23% |
| Greg Kroah-Hartman | 1 | 0.48% | 1 | 3.23% |
| Total | 208 | 100.00% | 31 | 100.00% |
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