arch/arc/include/asm/page.h

Source file repositories/reference/linux-study-clean/arch/arc/include/asm/page.h

File Facts

System
Linux kernel
Corpus path
arch/arc/include/asm/page.h
Extension
.h
Size
3345 bytes
Lines
144
Domain
Architecture Layer
Bucket
arch/arc
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_ARC_PAGE_H
#define __ASM_ARC_PAGE_H

#include <uapi/asm/page.h>

#ifdef CONFIG_ARC_HAS_PAE40

#define MAX_POSSIBLE_PHYSMEM_BITS	40
#define PAGE_MASK_PHYS			(0xff00000000ull | PAGE_MASK)

#else /* CONFIG_ARC_HAS_PAE40 */

#define MAX_POSSIBLE_PHYSMEM_BITS	32
#define PAGE_MASK_PHYS			PAGE_MASK

#endif /* CONFIG_ARC_HAS_PAE40 */

#ifndef __ASSEMBLER__

#define clear_page(paddr)		memset((paddr), 0, PAGE_SIZE)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
#define copy_page(to, from)		memcpy((to), (from), PAGE_SIZE)

struct vm_area_struct;
struct page;

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

void copy_user_highpage(struct page *to, struct page *from,
			unsigned long u_vaddr, struct vm_area_struct *vma);

#define clear_user_page clear_user_page
void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);

typedef struct {
	unsigned long pgd;
} pgd_t;

#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) })

#if CONFIG_PGTABLE_LEVELS > 3

typedef struct {
	unsigned long pud;
} pud_t;

#define pud_val(x)      	((x).pud)
#define __pud(x)        	((pud_t) { (x) })

#endif

#if CONFIG_PGTABLE_LEVELS > 2

typedef struct {
	unsigned long pmd;
} pmd_t;

#define pmd_val(x)	((x).pmd)
#define __pmd(x)	((pmd_t) { (x) })

#endif

typedef struct {
#ifdef CONFIG_ARC_HAS_PAE40
	unsigned long long pte;
#else
	unsigned long pte;
#endif
} pte_t;

#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) })

typedef struct {
	unsigned long pgprot;
} pgprot_t;

#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) })
#define pte_pgprot(x)	__pgprot(pte_val(x))

typedef struct page *pgtable_t;

/*
 * When HIGHMEM is enabled we have holes in the memory map so we need
 * pfn_valid() that takes into account the actual extents of the physical
 * memory
 */
#ifdef CONFIG_HIGHMEM

Annotation

Implementation Notes