#ifndef _ASM_FIXMAP_H #define _ASM_FIXMAP_H #ifdef CONFIG_X86_32 # include "fixmap_32.h" #else # include "fixmap_64.h" #endif extern int fixmaps_set; extern void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t flags); #define set_fixmap(idx, phys) \ __set_fixmap(idx, phys, PAGE_KERNEL) /* * Some hardware wants to get fixmapped without caching. */ #define set_fixmap_nocache(idx, phys) \ __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) #define clear_fixmap(idx) \ __set_fixmap(idx, 0, __pgprot(0)) #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) extern void __this_fixmap_does_not_exist(void); /* * 'index to address' translation. If anyone tries to use the idx * directly without translation, we catch the bug with a NULL-deference * kernel oops. Illegal ranges of incoming indices are caught too. */ static __always_inline unsigned long fix_to_virt(const unsigned int idx) { /* * this branch gets completely eliminated after inlining, * except when someone tries to use fixaddr indices in an * illegal way. (such as mixing up address types or using * out-of-range indices). * * If it doesn't get removed, the linker will complain * loudly with a reasonably clear error message.. */ if (idx >= __end_of_fixed_addresses) __this_fixmap_does_not_exist(); return __fix_to_virt(idx); } static inline unsigned long virt_to_fix(const unsigned long vaddr) { BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); return __virt_to_fix(vaddr); } #endif