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> |
Marcelo Tosatti | 71056ae | 2012-11-27 23:28:55 -0200 | [diff] [blame] | 22 | #include <asm/pvclock.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 23 | #ifdef CONFIG_X86_32 |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 24 | #include <linux/threads.h> |
| 25 | #include <asm/kmap_types.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 26 | #else |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 27 | #include <uapi/asm/vsyscall.h> |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 28 | #endif |
| 29 | |
| 30 | /* |
| 31 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
| 32 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
| 33 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
| 34 | */ |
| 35 | #ifdef CONFIG_X86_32 |
| 36 | /* used by vmalloc.c, vsyscall.lds.S. |
| 37 | * |
| 38 | * Leave one empty page between vmalloc'ed areas and |
| 39 | * the start of the fixmap. |
| 40 | */ |
| 41 | extern unsigned long __FIXADDR_TOP; |
| 42 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 43 | #else |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 44 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ |
| 45 | PAGE_SIZE) |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 46 | #endif |
| 47 | |
| 48 | |
| 49 | /* |
| 50 | * Here we define all the compile-time 'special' virtual |
| 51 | * addresses. The point is to have a constant address at |
| 52 | * compile time, but to set the physical address only |
| 53 | * in the boot process. |
| 54 | * for x86_32: We allocate these special addresses |
| 55 | * from the end of virtual memory (0xfffff000) backwards. |
| 56 | * Also this lets us do fail-safe vmalloc(), we |
| 57 | * can guarantee that these special addresses and |
| 58 | * vmalloc()-ed addresses never overlap. |
| 59 | * |
| 60 | * These 'compile-time allocated' memory buffers are |
| 61 | * fixed-size 4k pages (or larger if used with an increment |
| 62 | * higher than 1). Use set_fixmap(idx,phys) to associate |
| 63 | * physical memory with fixmap indices. |
| 64 | * |
| 65 | * TLB entries of such buffers will not be flushed across |
| 66 | * task switches. |
| 67 | */ |
| 68 | enum fixed_addresses { |
| 69 | #ifdef CONFIG_X86_32 |
| 70 | FIX_HOLE, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 71 | #else |
Andy Lutomirski | 1ad83c8 | 2014-10-29 14:33:47 -0700 | [diff] [blame] | 72 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 73 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
Andy Lutomirski | 1ad83c8 | 2014-10-29 14:33:47 -0700 | [diff] [blame] | 74 | #endif |
Marcelo Tosatti | 71056ae | 2012-11-27 23:28:55 -0200 | [diff] [blame] | 75 | #ifdef CONFIG_PARAVIRT_CLOCK |
| 76 | PVCLOCK_FIXMAP_BEGIN, |
| 77 | PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1, |
| 78 | #endif |
Jan Beulich | cbdce7b | 2013-05-29 13:22:23 +0100 | [diff] [blame] | 79 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 80 | FIX_DBGP_BASE, |
| 81 | FIX_EARLYCON_MEM_BASE, |
Jan Beulich | ff30a05 | 2010-03-15 10:11:15 +0000 | [diff] [blame] | 82 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
| 83 | FIX_OHCI1394_BASE, |
| 84 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 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 |
Kees Cook | 4eefbe7 | 2013-04-10 12:24:22 -0700 | [diff] [blame] | 92 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 93 | #ifdef CONFIG_X86_32 |
| 94 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
| 95 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
| 96 | #ifdef CONFIG_PCI_MMCONFIG |
| 97 | FIX_PCIE_MCFG, |
| 98 | #endif |
| 99 | #endif |
| 100 | #ifdef CONFIG_PARAVIRT |
| 101 | FIX_PARAVIRT_BOOTMAP, |
| 102 | #endif |
Mathieu Desnoyers | 12b9d7c | 2009-07-01 17:37:22 -0400 | [diff] [blame] | 103 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
| 104 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
Alan Cox | 933b946 | 2011-12-17 17:43:40 +0000 | [diff] [blame] | 105 | #ifdef CONFIG_X86_INTEL_MID |
Feng Tang | 7309282 | 2010-11-10 17:29:00 +0000 | [diff] [blame] | 106 | FIX_LNW_VRTC, |
| 107 | #endif |
Arjan van de Ven | fa36e95 | 2011-01-11 10:55:56 +0000 | [diff] [blame] | 108 | __end_of_permanent_fixed_addresses, |
| 109 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 110 | /* |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 111 | * 512 temporary boot-time mappings, used by early_ioremap(), |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 112 | * before ioremap() is functional. |
| 113 | * |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 114 | * If necessary we round it up to the next 512 pages boundary so |
Jan Beulich | 499a5f1 | 2009-12-18 16:05:51 +0000 | [diff] [blame] | 115 | * that we can have a single pgd entry and a single pte table: |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 116 | */ |
| 117 | #define NR_FIX_BTMAPS 64 |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 118 | #define FIX_BTMAPS_SLOTS 8 |
Jan Beulich | 499a5f1 | 2009-12-18 16:05:51 +0000 | [diff] [blame] | 119 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
| 120 | FIX_BTMAP_END = |
| 121 | (__end_of_permanent_fixed_addresses ^ |
| 122 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
| 123 | -PTRS_PER_PTE |
| 124 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
| 125 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
| 126 | : __end_of_permanent_fixed_addresses, |
| 127 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 128 | #ifdef CONFIG_X86_32 |
| 129 | FIX_WP_TEST, |
| 130 | #endif |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 131 | #ifdef CONFIG_INTEL_TXT |
| 132 | FIX_TBOOT_BASE, |
| 133 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 134 | __end_of_fixed_addresses |
| 135 | }; |
| 136 | |
| 137 | |
| 138 | extern void reserve_top_address(unsigned long reserve); |
| 139 | |
| 140 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 141 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
Ingo Molnar | 3ec9678 | 2008-04-25 18:25:25 +0200 | [diff] [blame] | 142 | |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 143 | extern int fixmaps_set; |
| 144 | |
Keith Packard | fd94093 | 2008-10-30 19:37:09 -0700 | [diff] [blame] | 145 | extern pte_t *kmap_pte; |
| 146 | extern pgprot_t kmap_prot; |
| 147 | extern pte_t *pkmap_page_table; |
| 148 | |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 149 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
| 150 | void native_set_fixmap(enum fixed_addresses idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 151 | phys_addr_t phys, pgprot_t flags); |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 152 | |
| 153 | #ifndef CONFIG_PARAVIRT |
| 154 | static inline void __set_fixmap(enum fixed_addresses idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 155 | phys_addr_t phys, pgprot_t flags) |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 156 | { |
| 157 | native_set_fixmap(idx, phys, flags); |
| 158 | } |
| 159 | #endif |
| 160 | |
Mark Salter | 114cefc | 2014-01-23 15:53:50 -0800 | [diff] [blame] | 161 | #include <asm-generic/fixmap.h> |
Feng Tang | 5a47c7d | 2010-09-13 15:08:54 +0800 | [diff] [blame] | 162 | |
Mark Salter | 5b7c73e | 2014-04-07 15:39:49 -0700 | [diff] [blame] | 163 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
| 164 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
| 165 | |
| 166 | void __early_set_fixmap(enum fixed_addresses idx, |
| 167 | phys_addr_t phys, pgprot_t flags); |
| 168 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 169 | #endif /* !__ASSEMBLY__ */ |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 170 | #endif /* _ASM_X86_FIXMAP_H */ |