arch/xtensa/include/asm/fixmap.h

Source file repositories/reference/linux-study-clean/arch/xtensa/include/asm/fixmap.h

File Facts

System
Linux kernel
Corpus path
arch/xtensa/include/asm/fixmap.h
Extension
.h
Size
1106 bytes
Lines
39
Domain
Architecture Layer
Bucket
arch/xtensa
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_FIXMAP_H
#define _ASM_FIXMAP_H

#ifdef CONFIG_HIGHMEM
#include <linux/threads.h>
#include <linux/pgtable.h>
#include <asm/kmap_size.h>

/* The map slots for temporary mappings via kmap_atomic/local(). */
enum fixed_addresses {
	FIX_KMAP_BEGIN,
	FIX_KMAP_END = FIX_KMAP_BEGIN +
		(KM_MAX_IDX * NR_CPUS * DCACHE_N_COLORS) - 1,
	__end_of_fixed_addresses
};

#define FIXADDR_END     (XCHAL_KSEG_CACHED_VADDR - PAGE_SIZE)
#define FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
/* Enforce that FIXADDR_START is PMD aligned to handle cache aliasing */
#define FIXADDR_START	((FIXADDR_END - FIXADDR_SIZE) & PMD_MASK)
#define FIXADDR_TOP	(FIXADDR_START + FIXADDR_SIZE - PAGE_SIZE)

#include <asm-generic/fixmap.h>

#endif /* CONFIG_HIGHMEM */
#endif

Annotation

Implementation Notes