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2c419bde KG |
1 | /* |
2 | * fixmap.h: compile-time virtual memory allocation | |
3 | * | |
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 | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 1998 Ingo Molnar | |
9 | * | |
10 | * Copyright 2008 Freescale Semiconductor Inc. | |
11 | * Port to powerpc added by Kumar Gala | |
12 | */ | |
13 | ||
14 | #ifndef _ASM_FIXMAP_H | |
15 | #define _ASM_FIXMAP_H | |
16 | ||
2c419bde | 17 | #ifndef __ASSEMBLY__ |
265c3491 | 18 | #include <linux/sizes.h> |
2c419bde | 19 | #include <asm/page.h> |
ca5999fd | 20 | #include <linux/pgtable.h> |
2c419bde KG |
21 | #ifdef CONFIG_HIGHMEM |
22 | #include <linux/threads.h> | |
23 | #include <asm/kmap_types.h> | |
24 | #endif | |
25 | ||
b4abe38f CL |
26 | #ifdef CONFIG_KASAN |
27 | #include <asm/kasan.h> | |
28 | #define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE) | |
29 | #else | |
f637a49e | 30 | #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) |
b4abe38f | 31 | #endif |
f637a49e | 32 | |
2c419bde KG |
33 | /* |
34 | * Here we define all the compile-time 'special' virtual | |
35 | * addresses. The point is to have a constant address at | |
36 | * compile time, but to set the physical address only | |
37 | * in the boot process. We allocate these special addresses | |
38 | * from the end of virtual memory (0xfffff000) backwards. | |
39 | * Also this lets us do fail-safe vmalloc(), we | |
40 | * can guarantee that these special addresses and | |
41 | * vmalloc()-ed addresses never overlap. | |
42 | * | |
43 | * these 'compile-time allocated' memory buffers are | |
44 | * fixed-size 4k pages. (or larger if used with an increment | |
45 | * highger than 1) use fixmap_set(idx,phys) to associate | |
46 | * physical memory with fixmap indices. | |
47 | * | |
48 | * TLB entries of such buffers will not be flushed across | |
49 | * task switches. | |
50 | */ | |
51 | enum fixed_addresses { | |
52 | FIX_HOLE, | |
b8e8efaa AH |
53 | /* reserve the top 128K for early debugging purposes */ |
54 | FIX_EARLY_DEBUG_TOP = FIX_HOLE, | |
55 | FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1, | |
2c419bde KG |
56 | #ifdef CONFIG_HIGHMEM |
57 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
58 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
f86ef74e CL |
59 | #endif |
60 | #ifdef CONFIG_PPC_8xx | |
61 | /* For IMMR we need an aligned 512K area */ | |
62 | #define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE) | |
6b7c095a CL |
63 | FIX_IMMR_START, |
64 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + | |
65 | FIX_IMMR_SIZE, | |
66 | #endif | |
67 | #ifdef CONFIG_PPC_83xx | |
68 | /* For IMMR we need an aligned 2M area */ | |
69 | #define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE) | |
f86ef74e CL |
70 | FIX_IMMR_START, |
71 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + | |
72 | FIX_IMMR_SIZE, | |
2c419bde KG |
73 | #endif |
74 | /* FIX_PCIE_MCFG, */ | |
265c3491 CL |
75 | __end_of_permanent_fixed_addresses, |
76 | ||
77 | #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) | |
78 | #define FIX_BTMAPS_SLOTS 16 | |
79 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) | |
80 | ||
81 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses, | |
82 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
2c419bde KG |
83 | __end_of_fixed_addresses |
84 | }; | |
85 | ||
2c419bde KG |
86 | #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
87 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) | |
88 | ||
925ac141 CL |
89 | #define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \ |
90 | ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE)) | |
91 | #define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE) | |
92 | ||
9494a1e8 | 93 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG |
265c3491 | 94 | #define FIXMAP_PAGE_IO PAGE_KERNEL_NCG |
2c419bde | 95 | |
9494a1e8 | 96 | #include <asm-generic/fixmap.h> |
2c419bde | 97 | |
4cfac2f9 CL |
98 | static inline void __set_fixmap(enum fixed_addresses idx, |
99 | phys_addr_t phys, pgprot_t flags) | |
100 | { | |
77693a5f CL |
101 | if (__builtin_constant_p(idx)) |
102 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | |
103 | else if (WARN_ON(idx >= __end_of_fixed_addresses)) | |
104 | return; | |
105 | ||
106 | map_kernel_page(__fix_to_virt(idx), phys, flags); | |
4cfac2f9 CL |
107 | } |
108 | ||
265c3491 CL |
109 | #define __early_set_fixmap __set_fixmap |
110 | ||
2c419bde KG |
111 | #endif /* !__ASSEMBLY__ */ |
112 | #endif |