arch/sparc/include/asm/highmem.h

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

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/highmem.h
Extension
.h
Size
1966 bytes
Lines
62
Domain
Architecture Layer
Bucket
arch/sparc
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/interrupt.h>
#include <linux/pgtable.h>
#include <asm/vaddrs.h>
#include <asm/pgtsrmmu.h>

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

#define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE)
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.  Currently the simplest way to do this is to align the
 * pkmap region on a pagetable boundary (4MB).
 */
#define LAST_PKMAP 1024
#define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT)
#define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VADDR + (SRMMU_MAX_NOCACHE_PAGES << PAGE_SHIFT))

#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 PKMAP_END (PKMAP_ADDR(LAST_PKMAP))

#define flush_cache_kmaps()	flush_cache_all()

/* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */
#define arch_kmap_local_pre_map(vaddr, pteval)	flush_cache_all()
#define arch_kmap_local_pre_unmap(vaddr)	flush_cache_all()
#define arch_kmap_local_post_map(vaddr, pteval)	flush_tlb_all()
#define arch_kmap_local_post_unmap(vaddr)	flush_tlb_all()

#endif /* __KERNEL__ */

#endif /* _ASM_HIGHMEM_H */

Annotation

Implementation Notes