arch/microblaze/include/asm/page.h

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

File Facts

System
Linux kernel
Corpus path
arch/microblaze/include/asm/page.h
Extension
.h
Size
3715 bytes
Lines
142
Domain
Architecture Layer
Bucket
arch/microblaze
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_MICROBLAZE_PAGE_H
#define _ASM_MICROBLAZE_PAGE_H

#include <linux/pfn.h>
#include <asm/setup.h>
#include <asm/asm-compat.h>
#include <linux/const.h>

#ifdef __KERNEL__

#include <vdso/page.h>

#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))

#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */

#ifndef __ASSEMBLER__

/*
 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
 * it is set to the kernel start address (aligned on a page boundary).
 *
 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
 * in arch/microblaze/Makefile.
 */
#define PAGE_OFFSET	CONFIG_KERNEL_START

/*
 * The basic type of a PTE - 32 bit physical addressing.
 */
typedef unsigned long pte_basic_t;
#define PTE_FMT		"%.8lx"

# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
# define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)

# define copy_user_page(vto, vfrom, vaddr, topg) \
			memcpy((vto), (vfrom), PAGE_SIZE)

/*
 * These are used to make use of C type-checking..
 */
typedef struct page *pgtable_t;
typedef struct { unsigned long	pte; }		pte_t;
typedef struct { unsigned long	pgprot; }	pgprot_t;
/* FIXME this can depend on linux kernel version */
typedef struct { unsigned long pgd; } pgd_t;

# define pte_val(x)	((x).pte)
# define pgprot_val(x)	((x).pgprot)

#   define pgd_val(x)      ((x).pgd)

# define __pte(x)	((pte_t) { (x) })
# define __pgd(x)	((pgd_t) { (x) })
# define __pgprot(x)	((pgprot_t) { (x) })

/**
 * Conversions for virtual address, physical address, pfn, and struct
 * page are defined in the following files.
 *
 * virt -+
 *	 | asm-microblaze/page.h
 * phys -+
 *	 | linux/pfn.h
 *  pfn -+
 *	 | asm-generic/memory_model.h
 * page -+
 *
 */

extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;
extern unsigned long max_pfn;

extern unsigned long memory_start;
extern unsigned long memory_size;
extern unsigned long lowmem_size;

extern unsigned long kernel_tlb;

extern int page_is_ram(unsigned long pfn);

# define phys_to_pfn(phys)	(PFN_DOWN(phys))
# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))

#  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)

#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)

Annotation

Implementation Notes