Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 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 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
| 11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
| 12 | */ |
| 13 | |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 14 | #ifndef _ASM_X86_FIXMAP_H |
| 15 | #define _ASM_X86_FIXMAP_H |
Ingo Molnar | 3ec9678 | 2008-04-25 18:25:25 +0200 | [diff] [blame] | 16 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 17 | #ifndef __ASSEMBLY__ |
| 18 | #include <linux/kernel.h> |
| 19 | #include <asm/acpi.h> |
| 20 | #include <asm/apicdef.h> |
| 21 | #include <asm/page.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 22 | #ifdef CONFIG_X86_32 |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 23 | #include <linux/threads.h> |
| 24 | #include <asm/kmap_types.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 25 | #else |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 26 | #include <asm/vsyscall.h> |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 27 | #endif |
| 28 | |
| 29 | /* |
| 30 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
| 31 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
| 32 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
| 33 | */ |
| 34 | #ifdef CONFIG_X86_32 |
| 35 | /* used by vmalloc.c, vsyscall.lds.S. |
| 36 | * |
| 37 | * Leave one empty page between vmalloc'ed areas and |
| 38 | * the start of the fixmap. |
| 39 | */ |
| 40 | extern unsigned long __FIXADDR_TOP; |
| 41 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
| 42 | |
| 43 | #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) |
| 44 | #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) |
| 45 | #else |
| 46 | #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE) |
| 47 | |
| 48 | /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */ |
| 49 | #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL) |
| 50 | #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE) |
| 51 | #endif |
| 52 | |
| 53 | |
| 54 | /* |
| 55 | * Here we define all the compile-time 'special' virtual |
| 56 | * addresses. The point is to have a constant address at |
| 57 | * compile time, but to set the physical address only |
| 58 | * in the boot process. |
| 59 | * for x86_32: We allocate these special addresses |
| 60 | * from the end of virtual memory (0xfffff000) backwards. |
| 61 | * Also this lets us do fail-safe vmalloc(), we |
| 62 | * can guarantee that these special addresses and |
| 63 | * vmalloc()-ed addresses never overlap. |
| 64 | * |
| 65 | * These 'compile-time allocated' memory buffers are |
| 66 | * fixed-size 4k pages (or larger if used with an increment |
| 67 | * higher than 1). Use set_fixmap(idx,phys) to associate |
| 68 | * physical memory with fixmap indices. |
| 69 | * |
| 70 | * TLB entries of such buffers will not be flushed across |
| 71 | * task switches. |
| 72 | */ |
| 73 | enum fixed_addresses { |
| 74 | #ifdef CONFIG_X86_32 |
| 75 | FIX_HOLE, |
| 76 | FIX_VDSO, |
| 77 | #else |
| 78 | VSYSCALL_LAST_PAGE, |
| 79 | VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE |
| 80 | + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1, |
| 81 | VSYSCALL_HPET, |
| 82 | #endif |
| 83 | FIX_DBGP_BASE, |
| 84 | FIX_EARLYCON_MEM_BASE, |
| 85 | #ifdef CONFIG_X86_LOCAL_APIC |
| 86 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
| 87 | #endif |
| 88 | #ifdef CONFIG_X86_IO_APIC |
| 89 | FIX_IO_APIC_BASE_0, |
| 90 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
| 91 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 92 | #ifdef CONFIG_X86_VISWS_APIC |
| 93 | FIX_CO_CPU, /* Cobalt timer */ |
| 94 | FIX_CO_APIC, /* Cobalt APIC Redirection Table */ |
| 95 | FIX_LI_PCIA, /* Lithium PCI Bridge A */ |
| 96 | FIX_LI_PCIB, /* Lithium PCI Bridge B */ |
| 97 | #endif |
| 98 | #ifdef CONFIG_X86_F00F_BUG |
| 99 | FIX_F00F_IDT, /* Virtual mapping for IDT */ |
| 100 | #endif |
| 101 | #ifdef CONFIG_X86_CYCLONE_TIMER |
| 102 | FIX_CYCLONE_TIMER, /*cyclone timer register*/ |
| 103 | #endif |
| 104 | #ifdef CONFIG_X86_32 |
| 105 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
| 106 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
| 107 | #ifdef CONFIG_PCI_MMCONFIG |
| 108 | FIX_PCIE_MCFG, |
| 109 | #endif |
| 110 | #endif |
| 111 | #ifdef CONFIG_PARAVIRT |
| 112 | FIX_PARAVIRT_BOOTMAP, |
| 113 | #endif |
Mathieu Desnoyers | 12b9d7c | 2009-07-01 17:37:22 -0400 | [diff] [blame^] | 114 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
| 115 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 116 | __end_of_permanent_fixed_addresses, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 117 | /* |
| 118 | * 256 temporary boot-time mappings, used by early_ioremap(), |
| 119 | * before ioremap() is functional. |
| 120 | * |
| 121 | * We round it up to the next 256 pages boundary so that we |
| 122 | * can have a single pgd entry and a single pte table: |
| 123 | */ |
| 124 | #define NR_FIX_BTMAPS 64 |
| 125 | #define FIX_BTMAPS_SLOTS 4 |
| 126 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 - |
| 127 | (__end_of_permanent_fixed_addresses & 255), |
| 128 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1, |
Jan Beulich | 789d03f | 2009-06-30 11:52:23 +0100 | [diff] [blame] | 129 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
| 130 | FIX_OHCI1394_BASE, |
| 131 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 132 | #ifdef CONFIG_X86_32 |
| 133 | FIX_WP_TEST, |
| 134 | #endif |
| 135 | __end_of_fixed_addresses |
| 136 | }; |
| 137 | |
| 138 | |
| 139 | extern void reserve_top_address(unsigned long reserve); |
| 140 | |
| 141 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
| 142 | #define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
| 143 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
| 144 | #define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE) |
Ingo Molnar | 3ec9678 | 2008-04-25 18:25:25 +0200 | [diff] [blame] | 145 | |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 146 | extern int fixmaps_set; |
| 147 | |
Keith Packard | fd94093 | 2008-10-30 19:37:09 -0700 | [diff] [blame] | 148 | extern pte_t *kmap_pte; |
| 149 | extern pgprot_t kmap_prot; |
| 150 | extern pte_t *pkmap_page_table; |
| 151 | |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 152 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
| 153 | void native_set_fixmap(enum fixed_addresses idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 154 | phys_addr_t phys, pgprot_t flags); |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 155 | |
| 156 | #ifndef CONFIG_PARAVIRT |
| 157 | static inline void __set_fixmap(enum fixed_addresses idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 158 | phys_addr_t phys, pgprot_t flags) |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 159 | { |
| 160 | native_set_fixmap(idx, phys, flags); |
| 161 | } |
| 162 | #endif |
| 163 | |
Jeremy Fitzhardinge | 944256e | 2008-06-17 11:41:49 -0700 | [diff] [blame] | 164 | #define set_fixmap(idx, phys) \ |
| 165 | __set_fixmap(idx, phys, PAGE_KERNEL) |
| 166 | |
| 167 | /* |
| 168 | * Some hardware wants to get fixmapped without caching. |
| 169 | */ |
| 170 | #define set_fixmap_nocache(idx, phys) \ |
| 171 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) |
| 172 | |
Ingo Molnar | 3ec9678 | 2008-04-25 18:25:25 +0200 | [diff] [blame] | 173 | #define clear_fixmap(idx) \ |
| 174 | __set_fixmap(idx, 0, __pgprot(0)) |
| 175 | |
Jeremy Fitzhardinge | 944256e | 2008-06-17 11:41:49 -0700 | [diff] [blame] | 176 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
| 177 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) |
| 178 | |
| 179 | extern void __this_fixmap_does_not_exist(void); |
| 180 | |
| 181 | /* |
| 182 | * 'index to address' translation. If anyone tries to use the idx |
| 183 | * directly without translation, we catch the bug with a NULL-deference |
| 184 | * kernel oops. Illegal ranges of incoming indices are caught too. |
| 185 | */ |
| 186 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) |
| 187 | { |
| 188 | /* |
| 189 | * this branch gets completely eliminated after inlining, |
| 190 | * except when someone tries to use fixaddr indices in an |
| 191 | * illegal way. (such as mixing up address types or using |
| 192 | * out-of-range indices). |
| 193 | * |
| 194 | * If it doesn't get removed, the linker will complain |
| 195 | * loudly with a reasonably clear error message.. |
| 196 | */ |
| 197 | if (idx >= __end_of_fixed_addresses) |
| 198 | __this_fixmap_does_not_exist(); |
| 199 | |
| 200 | return __fix_to_virt(idx); |
| 201 | } |
| 202 | |
| 203 | static inline unsigned long virt_to_fix(const unsigned long vaddr) |
| 204 | { |
| 205 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); |
| 206 | return __virt_to_fix(vaddr); |
| 207 | } |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 208 | #endif /* !__ASSEMBLY__ */ |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 209 | #endif /* _ASM_X86_FIXMAP_H */ |