Commit f7a849153be3b66326b52dce0d07896b56cb4cd7
Committed by
Ralf Baechle
Ralf Baechle
1 parent
6feb6efaec
Exists in
master
and in
7 other branches
[MIPS] Fix FIXADDR_TOP for TX39/TX49.
FIXADDR_TOP is used for HIGHMEM and for upper limit of vmalloc area on 32bit kernel. TX39XX and TX49XX have "reserved" segment in CKSEG3 area. 0xff000000-0xff3fffff on TX49XX and 0xff000000-0xfffeffff on TX39XX are reserved (unmapped, uncached) therefore can not be used as mapped area. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Showing 1 changed file with 4 additions and 0 deletions Inline Diff
include/asm-mips/fixmap.h
| 1 | /* | 1 | /* |
| 2 | * fixmap.h: compile-time virtual memory allocation | 2 | * fixmap.h: compile-time virtual memory allocation |
| 3 | * | 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU General Public | 4 | * This file is subject to the terms and conditions of the GNU General Public |
| 5 | * License. See the file "COPYING" in the main directory of this archive | 5 | * License. See the file "COPYING" in the main directory of this archive |
| 6 | * for more details. | 6 | * for more details. |
| 7 | * | 7 | * |
| 8 | * Copyright (C) 1998 Ingo Molnar | 8 | * Copyright (C) 1998 Ingo Molnar |
| 9 | * | 9 | * |
| 10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | 10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
| 11 | */ | 11 | */ |
| 12 | 12 | ||
| 13 | #ifndef _ASM_FIXMAP_H | 13 | #ifndef _ASM_FIXMAP_H |
| 14 | #define _ASM_FIXMAP_H | 14 | #define _ASM_FIXMAP_H |
| 15 | 15 | ||
| 16 | #include <asm/page.h> | 16 | #include <asm/page.h> |
| 17 | #ifdef CONFIG_HIGHMEM | 17 | #ifdef CONFIG_HIGHMEM |
| 18 | #include <linux/threads.h> | 18 | #include <linux/threads.h> |
| 19 | #include <asm/kmap_types.h> | 19 | #include <asm/kmap_types.h> |
| 20 | #endif | 20 | #endif |
| 21 | 21 | ||
| 22 | /* | 22 | /* |
| 23 | * Here we define all the compile-time 'special' virtual | 23 | * Here we define all the compile-time 'special' virtual |
| 24 | * addresses. The point is to have a constant address at | 24 | * addresses. The point is to have a constant address at |
| 25 | * compile time, but to set the physical address only | 25 | * compile time, but to set the physical address only |
| 26 | * in the boot process. We allocate these special addresses | 26 | * in the boot process. We allocate these special addresses |
| 27 | * from the end of virtual memory (0xfffff000) backwards. | 27 | * from the end of virtual memory (0xfffff000) backwards. |
| 28 | * Also this lets us do fail-safe vmalloc(), we | 28 | * Also this lets us do fail-safe vmalloc(), we |
| 29 | * can guarantee that these special addresses and | 29 | * can guarantee that these special addresses and |
| 30 | * vmalloc()-ed addresses never overlap. | 30 | * vmalloc()-ed addresses never overlap. |
| 31 | * | 31 | * |
| 32 | * these 'compile-time allocated' memory buffers are | 32 | * these 'compile-time allocated' memory buffers are |
| 33 | * fixed-size 4k pages. (or larger if used with an increment | 33 | * fixed-size 4k pages. (or larger if used with an increment |
| 34 | * highger than 1) use fixmap_set(idx,phys) to associate | 34 | * highger than 1) use fixmap_set(idx,phys) to associate |
| 35 | * physical memory with fixmap indices. | 35 | * physical memory with fixmap indices. |
| 36 | * | 36 | * |
| 37 | * TLB entries of such buffers will not be flushed across | 37 | * TLB entries of such buffers will not be flushed across |
| 38 | * task switches. | 38 | * task switches. |
| 39 | */ | 39 | */ |
| 40 | 40 | ||
| 41 | /* | 41 | /* |
| 42 | * on UP currently we will have no trace of the fixmap mechanizm, | 42 | * on UP currently we will have no trace of the fixmap mechanizm, |
| 43 | * no page table allocations, etc. This might change in the | 43 | * no page table allocations, etc. This might change in the |
| 44 | * future, say framebuffers for the console driver(s) could be | 44 | * future, say framebuffers for the console driver(s) could be |
| 45 | * fix-mapped? | 45 | * fix-mapped? |
| 46 | */ | 46 | */ |
| 47 | enum fixed_addresses { | 47 | enum fixed_addresses { |
| 48 | #ifdef CONFIG_HIGHMEM | 48 | #ifdef CONFIG_HIGHMEM |
| 49 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | 49 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
| 50 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | 50 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
| 51 | #endif | 51 | #endif |
| 52 | __end_of_fixed_addresses | 52 | __end_of_fixed_addresses |
| 53 | }; | 53 | }; |
| 54 | 54 | ||
| 55 | extern void __set_fixmap (enum fixed_addresses idx, | 55 | extern void __set_fixmap (enum fixed_addresses idx, |
| 56 | unsigned long phys, pgprot_t flags); | 56 | unsigned long phys, pgprot_t flags); |
| 57 | 57 | ||
| 58 | #define set_fixmap(idx, phys) \ | 58 | #define set_fixmap(idx, phys) \ |
| 59 | __set_fixmap(idx, phys, PAGE_KERNEL) | 59 | __set_fixmap(idx, phys, PAGE_KERNEL) |
| 60 | /* | 60 | /* |
| 61 | * Some hardware wants to get fixmapped without caching. | 61 | * Some hardware wants to get fixmapped without caching. |
| 62 | */ | 62 | */ |
| 63 | #define set_fixmap_nocache(idx, phys) \ | 63 | #define set_fixmap_nocache(idx, phys) \ |
| 64 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | 64 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) |
| 65 | /* | 65 | /* |
| 66 | * used by vmalloc.c. | 66 | * used by vmalloc.c. |
| 67 | * | 67 | * |
| 68 | * Leave one empty page between vmalloc'ed areas and | 68 | * Leave one empty page between vmalloc'ed areas and |
| 69 | * the start of the fixmap, and leave one page empty | 69 | * the start of the fixmap, and leave one page empty |
| 70 | * at the top of mem.. | 70 | * at the top of mem.. |
| 71 | */ | 71 | */ |
| 72 | #if defined(CONFIG_CPU_TX39XX) || defined(CONFIG_CPU_TX49XX) | ||
| 73 | #define FIXADDR_TOP (0xff000000UL - 0x2000) | ||
| 74 | #else | ||
| 72 | #define FIXADDR_TOP (0xffffe000UL) | 75 | #define FIXADDR_TOP (0xffffe000UL) |
| 76 | #endif | ||
| 73 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | 77 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
| 74 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | 78 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
| 75 | 79 | ||
| 76 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | 80 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
| 77 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | 81 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) |
| 78 | 82 | ||
| 79 | extern void __this_fixmap_does_not_exist(void); | 83 | extern void __this_fixmap_does_not_exist(void); |
| 80 | 84 | ||
| 81 | /* | 85 | /* |
| 82 | * 'index to address' translation. If anyone tries to use the idx | 86 | * 'index to address' translation. If anyone tries to use the idx |
| 83 | * directly without tranlation, we catch the bug with a NULL-deference | 87 | * directly without tranlation, we catch the bug with a NULL-deference |
| 84 | * kernel oops. Illegal ranges of incoming indices are caught too. | 88 | * kernel oops. Illegal ranges of incoming indices are caught too. |
| 85 | */ | 89 | */ |
| 86 | static inline unsigned long fix_to_virt(const unsigned int idx) | 90 | static inline unsigned long fix_to_virt(const unsigned int idx) |
| 87 | { | 91 | { |
| 88 | /* | 92 | /* |
| 89 | * this branch gets completely eliminated after inlining, | 93 | * this branch gets completely eliminated after inlining, |
| 90 | * except when someone tries to use fixaddr indices in an | 94 | * except when someone tries to use fixaddr indices in an |
| 91 | * illegal way. (such as mixing up address types or using | 95 | * illegal way. (such as mixing up address types or using |
| 92 | * out-of-range indices). | 96 | * out-of-range indices). |
| 93 | * | 97 | * |
| 94 | * If it doesn't get removed, the linker will complain | 98 | * If it doesn't get removed, the linker will complain |
| 95 | * loudly with a reasonably clear error message.. | 99 | * loudly with a reasonably clear error message.. |
| 96 | */ | 100 | */ |
| 97 | if (idx >= __end_of_fixed_addresses) | 101 | if (idx >= __end_of_fixed_addresses) |
| 98 | __this_fixmap_does_not_exist(); | 102 | __this_fixmap_does_not_exist(); |
| 99 | 103 | ||
| 100 | return __fix_to_virt(idx); | 104 | return __fix_to_virt(idx); |
| 101 | } | 105 | } |
| 102 | 106 | ||
| 103 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | 107 | static inline unsigned long virt_to_fix(const unsigned long vaddr) |
| 104 | { | 108 | { |
| 105 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | 109 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); |
| 106 | return __virt_to_fix(vaddr); | 110 | return __virt_to_fix(vaddr); |
| 107 | } | 111 | } |
| 108 | 112 | ||
| 109 | /* | 113 | /* |
| 110 | * Called from pgtable_init() | 114 | * Called from pgtable_init() |
| 111 | */ | 115 | */ |
| 112 | extern void fixrange_init(unsigned long start, unsigned long end, | 116 | extern void fixrange_init(unsigned long start, unsigned long end, |
| 113 | pgd_t *pgd_base); | 117 | pgd_t *pgd_base); |
| 114 | 118 | ||
| 115 | 119 | ||
| 116 | #endif | 120 | #endif |
| 117 | 121 |