1 #ifndef _ASM_FIXMAP_H 2 #define _ASM_FIXMAP_H 3 4 /* 5 * Nothing too fancy for now. 6 * 7 * On ARM we already have well known fixed virtual addresses imposed by 8 * the architecture such as the vector page which is located at 0xffff0000, 9 * therefore a second level page table is already allocated covering 10 * 0xfff00000 upwards. 11 * 12 * The cache flushing code in proc-xscale.S uses the virtual area between 13 * 0xfffe0000 and 0xfffeffff. 14 */ 15 16 #define FIXADDR_START 0xfff00000UL 17 #define FIXADDR_TOP 0xfffe0000UL 18 #define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) 19 20 #define FIX_KMAP_BEGIN 0 21 #define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT) 22 23 #define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) 24 #define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT) 25 26 extern void __this_fixmap_does_not_exist(void); 27 28 static inline unsigned long fix_to_virt(const unsigned int idx) 29 { 30 if (idx >= FIX_KMAP_END) 31 __this_fixmap_does_not_exist(); 32 return __fix_to_virt(idx); 33 } 34 35 static inline unsigned int virt_to_fix(const unsigned long vaddr) 36 { 37 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); 38 return __virt_to_fix(vaddr); 39 } 40 41 #endif 42