16bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#ifndef _ASM_SCORE_FIXMAP_H 26bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define _ASM_SCORE_FIXMAP_H 36bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 46bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#include <asm/page.h> 56bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 66bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define PHY_RAM_BASE 0x00000000 76bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define PHY_IO_BASE 0x10000000 86bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 96bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define VIRTUAL_RAM_BASE 0xa0000000 106bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define VIRTUAL_IO_BASE 0xb0000000 116bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 126bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define RAM_SPACE_SIZE 0x10000000 136bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define IO_SPACE_SIZE 0x10000000 146bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 156bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin/* Kernel unmapped, cached 512MB */ 166bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define KSEG1 0xa0000000 176bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 186bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin/* 196bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * Here we define all the compile-time 'special' virtual 206bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * addresses. The point is to have a constant address at 216bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * compile time, but to set the physical address only 226bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * in the boot process. We allocate these special addresses 236bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * from the end of virtual memory (0xfffff000) backwards. 246bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * Also this lets us do fail-safe vmalloc(), we 256bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * can guarantee that these special addresses and 266bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * vmalloc()-ed addresses never overlap. 276bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * 286bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * these 'compile-time allocated' memory buffers are 296bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * fixed-size 4k pages. (or larger if used with an increment 306bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * highger than 1) use fixmap_set(idx,phys) to associate 316bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * physical memory with fixmap indices. 326bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * 336bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * TLB entries of such buffers will not be flushed across 346bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * task switches. 356bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin */ 366bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 376bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin/* 386bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * on UP currently we will have no trace of the fixmap mechanizm, 396bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * no page table allocations, etc. This might change in the 406bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * future, say framebuffers for the console driver(s) could be 416bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * fix-mapped? 426bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin */ 436bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqinenum fixed_addresses { 446bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define FIX_N_COLOURS 8 456bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin FIX_CMAP_BEGIN, 466bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS, 476bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin __end_of_fixed_addresses 486bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin}; 496bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 506bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin/* 516bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * used by vmalloc.c. 526bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * 536bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * Leave one empty page between vmalloc'ed areas and 546bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * the start of the fixmap, and leave one page empty 556bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * at the top of mem.. 566bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin */ 576bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define FIXADDR_TOP ((unsigned long)(long)(int)0xfefe0000) 586bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 596bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 606bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 616bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) 626bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#define __virt_to_fix(x) \ 636bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin ((FIXADDR_TOP - ((x) & PAGE_MASK)) >> PAGE_SHIFT) 646bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 656bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqinextern void __this_fixmap_does_not_exist(void); 666bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 676bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin/* 686bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * 'index to address' translation. If anyone tries to use the idx 696bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * directly without tranlation, we catch the bug with a NULL-deference 706bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin * kernel oops. Illegal ranges of incoming indices are caught too. 716bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin */ 726bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqinstatic inline unsigned long fix_to_virt(const unsigned int idx) 736bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin{ 746bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin return __fix_to_virt(idx); 756bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin} 766bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 776bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqinstatic inline unsigned long virt_to_fix(const unsigned long vaddr) 786bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin{ 796bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin return __virt_to_fix(vaddr); 806bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin} 816bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin 826bc9a3966f0395419b09b2ec90f89f7f00341b37Chen Liqin#endif /* _ASM_SCORE_FIXMAP_H */ 83