1 #ifndef ASM_X86__FIXMAP_H 2 #define ASM_X86__FIXMAP_H 3 4 #ifdef CONFIG_X86_32 5 # include "fixmap_32.h" 6 #else 7 # include "fixmap_64.h" 8 #endif 9 10 extern int fixmaps_set; 11 12 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); 13 void native_set_fixmap(enum fixed_addresses idx, 14 unsigned long phys, pgprot_t flags); 15 16 #ifndef CONFIG_PARAVIRT 17 static inline void __set_fixmap(enum fixed_addresses idx, 18 unsigned long phys, pgprot_t flags) 19 { 20 native_set_fixmap(idx, phys, flags); 21 } 22 #endif 23 24 #define set_fixmap(idx, phys) \ 25 __set_fixmap(idx, phys, PAGE_KERNEL) 26 27 /* 28 * Some hardware wants to get fixmapped without caching. 29 */ 30 #define set_fixmap_nocache(idx, phys) \ 31 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) 32 33 #define clear_fixmap(idx) \ 34 __set_fixmap(idx, 0, __pgprot(0)) 35 36 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) 37 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) 38 39 extern void __this_fixmap_does_not_exist(void); 40 41 /* 42 * 'index to address' translation. If anyone tries to use the idx 43 * directly without translation, we catch the bug with a NULL-deference 44 * kernel oops. Illegal ranges of incoming indices are caught too. 45 */ 46 static __always_inline unsigned long fix_to_virt(const unsigned int idx) 47 { 48 /* 49 * this branch gets completely eliminated after inlining, 50 * except when someone tries to use fixaddr indices in an 51 * illegal way. (such as mixing up address types or using 52 * out-of-range indices). 53 * 54 * If it doesn't get removed, the linker will complain 55 * loudly with a reasonably clear error message.. 56 */ 57 if (idx >= __end_of_fixed_addresses) 58 __this_fixmap_does_not_exist(); 59 60 return __fix_to_virt(idx); 61 } 62 63 static inline unsigned long virt_to_fix(const unsigned long vaddr) 64 { 65 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); 66 return __virt_to_fix(vaddr); 67 } 68 #endif /* ASM_X86__FIXMAP_H */ 69