arch/mips/include/asm/highmem.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/highmem.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/highmem.h
Extension
.h
Size
1741 bytes
Lines
61
Domain
Architecture Layer
Bucket
arch/mips
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_HIGHMEM_H
#define _ASM_HIGHMEM_H

#ifdef __KERNEL__

#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <asm/cpu-features.h>
#include <asm/kmap_size.h>

/* declarations for highmem.c */
extern unsigned long highstart_pfn, highend_pfn;

extern pte_t *pkmap_page_table;

/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 */
#if defined(CONFIG_PHYS_ADDR_T_64BIT) || defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
#define LAST_PKMAP 512
#else
#define LAST_PKMAP 1024
#endif

#define LAST_PKMAP_MASK (LAST_PKMAP-1)
#define PKMAP_NR(virt)	((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr)	(PKMAP_BASE + ((nr) << PAGE_SHIFT))

#define ARCH_HAS_KMAP_FLUSH_TLB
extern void kmap_flush_tlb(unsigned long addr);

#define flush_cache_kmaps()	BUG_ON(cpu_has_dc_aliases)

#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	set_pte(ptep, ptev)
#define arch_kmap_local_post_map(vaddr, pteval)	local_flush_tlb_one(vaddr)
#define arch_kmap_local_post_unmap(vaddr)	local_flush_tlb_one(vaddr)

#endif /* __KERNEL__ */

#endif /* _ASM_HIGHMEM_H */

Annotation

Implementation Notes