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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> |
ca5999fd | 19 | #include <linux/pgtable.h> |
65fddcfc | 20 | #include <asm/page.h> |
2c419bde KG |
21 | #ifdef CONFIG_HIGHMEM |
22 | #include <linux/threads.h> | |
47da42b2 | 23 | #include <asm/kmap_size.h> |
2c419bde KG |
24 | #endif |
25 | ||
9ccba66d CL |
26 | #ifdef CONFIG_PPC64 |
27 | #define FIXADDR_TOP (IOREMAP_END + FIXADDR_SIZE) | |
28 | #else | |
29 | #define FIXADDR_SIZE 0 | |
b4abe38f CL |
30 | #ifdef CONFIG_KASAN |
31 | #include <asm/kasan.h> | |
32 | #define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE) | |
33 | #else | |
f637a49e | 34 | #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) |
b4abe38f | 35 | #endif |
9ccba66d | 36 | #endif |
f637a49e | 37 | |
2c419bde KG |
38 | /* |
39 | * Here we define all the compile-time 'special' virtual | |
40 | * addresses. The point is to have a constant address at | |
41 | * compile time, but to set the physical address only | |
42 | * in the boot process. We allocate these special addresses | |
43 | * from the end of virtual memory (0xfffff000) backwards. | |
44 | * Also this lets us do fail-safe vmalloc(), we | |
45 | * can guarantee that these special addresses and | |
46 | * vmalloc()-ed addresses never overlap. | |
47 | * | |
48 | * these 'compile-time allocated' memory buffers are | |
49 | * fixed-size 4k pages. (or larger if used with an increment | |
50 | * highger than 1) use fixmap_set(idx,phys) to associate | |
51 | * physical memory with fixmap indices. | |
52 | * | |
53 | * TLB entries of such buffers will not be flushed across | |
54 | * task switches. | |
55 | */ | |
56 | enum fixed_addresses { | |
57 | FIX_HOLE, | |
9ccba66d | 58 | #ifdef CONFIG_PPC32 |
b8e8efaa AH |
59 | /* reserve the top 128K for early debugging purposes */ |
60 | FIX_EARLY_DEBUG_TOP = FIX_HOLE, | |
fdc6edbb | 61 | FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1, |
2c419bde KG |
62 | #ifdef CONFIG_HIGHMEM |
63 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
47da42b2 | 64 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, |
f86ef74e CL |
65 | #endif |
66 | #ifdef CONFIG_PPC_8xx | |
67 | /* For IMMR we need an aligned 512K area */ | |
68 | #define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE) | |
6b7c095a CL |
69 | FIX_IMMR_START, |
70 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + | |
71 | FIX_IMMR_SIZE, | |
72 | #endif | |
73 | #ifdef CONFIG_PPC_83xx | |
74 | /* For IMMR we need an aligned 2M area */ | |
75 | #define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE) | |
f86ef74e CL |
76 | FIX_IMMR_START, |
77 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + | |
78 | FIX_IMMR_SIZE, | |
2c419bde KG |
79 | #endif |
80 | /* FIX_PCIE_MCFG, */ | |
9ccba66d | 81 | #endif /* CONFIG_PPC32 */ |
265c3491 CL |
82 | __end_of_permanent_fixed_addresses, |
83 | ||
84 | #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) | |
85 | #define FIX_BTMAPS_SLOTS 16 | |
86 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) | |
87 | ||
88 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses, | |
89 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
2c419bde KG |
90 | __end_of_fixed_addresses |
91 | }; | |
92 | ||
2c419bde KG |
93 | #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
94 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) | |
95 | ||
925ac141 CL |
96 | #define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \ |
97 | ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE)) | |
98 | #define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE) | |
99 | ||
9494a1e8 | 100 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG |
265c3491 | 101 | #define FIXMAP_PAGE_IO PAGE_KERNEL_NCG |
2c419bde | 102 | |
9494a1e8 | 103 | #include <asm-generic/fixmap.h> |
2c419bde | 104 | |
4cfac2f9 CL |
105 | static inline void __set_fixmap(enum fixed_addresses idx, |
106 | phys_addr_t phys, pgprot_t flags) | |
107 | { | |
9ccba66d CL |
108 | BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE); |
109 | ||
77693a5f CL |
110 | if (__builtin_constant_p(idx)) |
111 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | |
112 | else if (WARN_ON(idx >= __end_of_fixed_addresses)) | |
113 | return; | |
114 | ||
115 | map_kernel_page(__fix_to_virt(idx), phys, flags); | |
4cfac2f9 CL |
116 | } |
117 | ||
265c3491 CL |
118 | #define __early_set_fixmap __set_fixmap |
119 | ||
2c419bde KG |
120 | #endif /* !__ASSEMBLY__ */ |
121 | #endif |