arch/sh/include/asm/page.h
Source file repositories/reference/linux-study-clean/arch/sh/include/asm/page.h
File Facts
- System
- Linux kernel
- Corpus path
arch/sh/include/asm/page.h- Extension
.h- Size
- 4711 bytes
- Lines
- 164
- Domain
- Architecture Layer
- Bucket
- arch/sh
- Inferred role
- Architecture Layer: implementation source
- Status
- source implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/const.hvdso/page.hasm/uncached.hasm-generic/memory_model.hasm-generic/getorder.h
Detected Declarations
struct pagestruct vm_area_structfunction pages_do_alias
Annotated Snippet
#ifndef __ASM_SH_PAGE_H
#define __ASM_SH_PAGE_H
/*
* Copyright (C) 1999 Niibe Yutaka
*/
#include <linux/const.h>
#include <vdso/page.h>
#define PTE_MASK PAGE_MASK
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define HPAGE_SHIFT 16
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
#define HPAGE_SHIFT 18
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define HPAGE_SHIFT 20
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define HPAGE_SHIFT 22
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
#define HPAGE_SHIFT 26
#endif
#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
#define HPAGE_MASK (~(HPAGE_SIZE-1))
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
#endif
#ifndef __ASSEMBLER__
#include <asm/uncached.h>
extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
extern unsigned long memory_start, memory_end, memory_limit;
static inline unsigned long
pages_do_alias(unsigned long addr1, unsigned long addr2)
{
return (addr1 ^ addr2) & shm_align_mask;
}
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, void *from);
#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE)
struct page;
struct vm_area_struct;
extern void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
extern void clear_user_highpage(struct page *page, unsigned long vaddr);
#define clear_user_highpage clear_user_highpage
/*
* These are used to make use of C type-checking..
*/
#ifdef CONFIG_X2TLB
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pgprot; } pgprot_t;
typedef struct { unsigned long long pgd; } pgd_t;
#define pte_val(x) \
((x).pte_low | ((unsigned long long)(x).pte_high << 32))
#define __pte(x) \
({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pgd; } pgd_t;
#define pte_val(x) ((x).pte_low)
#define __pte(x) ((pte_t) { (x) } )
#endif
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
typedef struct page *pgtable_t;
#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
#endif /* !__ASSEMBLER__ */
/*
* __MEMORY_START and SIZE are the physical addresses and size of RAM.
Annotation
- Immediate include surface: `linux/const.h`, `vdso/page.h`, `asm/uncached.h`, `asm-generic/memory_model.h`, `asm-generic/getorder.h`.
- Detected declarations: `struct page`, `struct vm_area_struct`, `function pages_do_alias`.
- Atlas domain: Architecture Layer / arch/sh.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.