projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 6bc9a396 CL |
2 | #ifndef _ASM_SCORE_FIXMAP_H |
| 3 | #define _ASM_SCORE_FIXMAP_H | |
| 4 | ||
| 5 | #include <asm/page.h> | |
| 6 | ||
| 7 | #define PHY_RAM_BASE 0x00000000 | |
| 8 | #define PHY_IO_BASE 0x10000000 | |
| 9 | ||
| 10 | #define VIRTUAL_RAM_BASE 0xa0000000 | |
| 11 | #define VIRTUAL_IO_BASE 0xb0000000 | |
| 12 | ||
| 13 | #define RAM_SPACE_SIZE 0x10000000 | |
| 14 | #define IO_SPACE_SIZE 0x10000000 | |
| 15 | ||
| 16 | /* Kernel unmapped, cached 512MB */ | |
| 17 | #define KSEG1 0xa0000000 | |
| 18 | ||
| 19 | /* | |
| 20 | * Here we define all the compile-time 'special' virtual | |
| 21 | * addresses. The point is to have a constant address at | |
| 22 | * compile time, but to set the physical address only | |
| 23 | * in the boot process. We allocate these special addresses | |
| 24 | * from the end of virtual memory (0xfffff000) backwards. | |
| 25 | * Also this lets us do fail-safe vmalloc(), we | |
| 26 | * can guarantee that these special addresses and | |
| 27 | * vmalloc()-ed addresses never overlap. | |
| 28 | * | |
| 29 | * these 'compile-time allocated' memory buffers are | |
| 30 | * fixed-size 4k pages. (or larger if used with an increment | |
| 31 | * highger than 1) use fixmap_set(idx,phys) to associate | |
| 32 | * physical memory with fixmap indices. | |
| 33 | * | |
| 34 | * TLB entries of such buffers will not be flushed across | |
| 35 | * task switches. | |
| 36 | */ | |
| 37 | ||
| 38 | /* | |
| 39 | * on UP currently we will have no trace of the fixmap mechanizm, | |
| 40 | * no page table allocations, etc. This might change in the | |
| 41 | * future, say framebuffers for the console driver(s) could be | |
| 42 | * fix-mapped? | |
| 43 | */ | |
| 44 | enum fixed_addresses { | |
| 45 | #define FIX_N_COLOURS 8 | |
| 46 | FIX_CMAP_BEGIN, | |
| 47 | FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS, | |
| 48 | __end_of_fixed_addresses | |
| 49 | }; | |
| 50 | ||
| 51 | /* | |
| 52 | * used by vmalloc.c. | |
| 53 | * | |
| 54 | * Leave one empty page between vmalloc'ed areas and | |
| 55 | * the start of the fixmap, and leave one page empty | |
| 56 | * at the top of mem.. | |
| 57 | */ | |
| 58 | #define FIXADDR_TOP ((unsigned long)(long)(int)0xfefe0000) | |
| 59 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | |
| 60 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | |
| 61 | ||
| 62 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | |
| 63 | #define __virt_to_fix(x) \ | |
| 64 | ((FIXADDR_TOP - ((x) & PAGE_MASK)) >> PAGE_SHIFT) | |
| 65 | ||
| 66 | extern void __this_fixmap_does_not_exist(void); | |
| 67 | ||
| 68 | /* | |
| 69 | * 'index to address' translation. If anyone tries to use the idx | |
| 70 | * directly without tranlation, we catch the bug with a NULL-deference | |
| 71 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
| 72 | */ | |
| 73 | static inline unsigned long fix_to_virt(const unsigned int idx) | |
| 74 | { | |
| 75 | return __fix_to_virt(idx); | |
| 76 | } | |
| 77 | ||
| 78 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
| 79 | { | |
| 80 | return __virt_to_fix(vaddr); | |
| 81 | } | |
| 82 | ||
| 83 | #endif /* _ASM_SCORE_FIXMAP_H */ |