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 | |
Thomas Gleixner | 14df326 | 2020-11-18 20:48:41 +0100 | [diff] [blame] | 17 | #include <asm/kmap_size.h> |
| 18 | |
Feng Tang | 05ab1d8 | 2018-09-20 10:58:28 +0800 | [diff] [blame] | 19 | /* |
| 20 | * Exposed to assembly code for setting up initial page tables. Cannot be |
| 21 | * calculated in assembly code (fixmap entries are an enum), but is sanity |
| 22 | * checked in the actual fixmap C code to make sure that the fixmap is |
| 23 | * covered fully. |
| 24 | */ |
Thomas Gleixner | 14df326 | 2020-11-18 20:48:41 +0100 | [diff] [blame] | 25 | #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP |
| 26 | # define FIXMAP_PMD_NUM 2 |
| 27 | #else |
| 28 | # define KM_PMDS (KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512)) |
| 29 | # define FIXMAP_PMD_NUM (KM_PMDS + 2) |
| 30 | #endif |
Feng Tang | 05ab1d8 | 2018-09-20 10:58:28 +0800 | [diff] [blame] | 31 | /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ |
| 32 | #define FIXMAP_PMD_TOP 507 |
| 33 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 34 | #ifndef __ASSEMBLY__ |
| 35 | #include <linux/kernel.h> |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 36 | #include <asm/apicdef.h> |
| 37 | #include <asm/page.h> |
Peter Zijlstra | 0cd39f4 | 2020-08-06 14:35:11 +0200 | [diff] [blame] | 38 | #include <asm/pgtable_types.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 39 | #ifdef CONFIG_X86_32 |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 40 | #include <linux/threads.h> |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 41 | #else |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 42 | #include <uapi/asm/vsyscall.h> |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 43 | #endif |
| 44 | |
| 45 | /* |
| 46 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
| 47 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
| 48 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
| 49 | */ |
| 50 | #ifdef CONFIG_X86_32 |
Cao jin | c84b82d | 2019-08-09 19:46:12 +0800 | [diff] [blame] | 51 | /* |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 52 | * Leave one empty page between vmalloc'ed areas and |
| 53 | * the start of the fixmap. |
| 54 | */ |
| 55 | extern unsigned long __FIXADDR_TOP; |
| 56 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 57 | #else |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 58 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ |
| 59 | PAGE_SIZE) |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 60 | #endif |
| 61 | |
Andy Lutomirski | ef8813a | 2017-12-04 15:07:15 +0100 | [diff] [blame] | 62 | /* |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 63 | * Here we define all the compile-time 'special' virtual |
| 64 | * addresses. The point is to have a constant address at |
| 65 | * compile time, but to set the physical address only |
| 66 | * in the boot process. |
| 67 | * for x86_32: We allocate these special addresses |
| 68 | * from the end of virtual memory (0xfffff000) backwards. |
| 69 | * Also this lets us do fail-safe vmalloc(), we |
| 70 | * can guarantee that these special addresses and |
| 71 | * vmalloc()-ed addresses never overlap. |
| 72 | * |
| 73 | * These 'compile-time allocated' memory buffers are |
| 74 | * fixed-size 4k pages (or larger if used with an increment |
| 75 | * higher than 1). Use set_fixmap(idx,phys) to associate |
| 76 | * physical memory with fixmap indices. |
| 77 | * |
| 78 | * TLB entries of such buffers will not be flushed across |
| 79 | * task switches. |
| 80 | */ |
| 81 | enum fixed_addresses { |
| 82 | #ifdef CONFIG_X86_32 |
| 83 | FIX_HOLE, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 84 | #else |
Andy Lutomirski | 1ad83c8 | 2014-10-29 14:33:47 -0700 | [diff] [blame] | 85 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
Andy Lutomirski | f40c330 | 2014-05-05 12:19:36 -0700 | [diff] [blame] | 86 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
Andy Lutomirski | 1ad83c8 | 2014-10-29 14:33:47 -0700 | [diff] [blame] | 87 | #endif |
Jan Beulich | cbdce7b | 2013-05-29 13:22:23 +0100 | [diff] [blame] | 88 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 89 | FIX_DBGP_BASE, |
| 90 | FIX_EARLYCON_MEM_BASE, |
Jan Beulich | ff30a05 | 2010-03-15 10:11:15 +0000 | [diff] [blame] | 91 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
| 92 | FIX_OHCI1394_BASE, |
| 93 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 94 | #ifdef CONFIG_X86_LOCAL_APIC |
| 95 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
| 96 | #endif |
| 97 | #ifdef CONFIG_X86_IO_APIC |
| 98 | FIX_IO_APIC_BASE_0, |
| 99 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
| 100 | #endif |
Thomas Gleixner | 14df326 | 2020-11-18 20:48:41 +0100 | [diff] [blame] | 101 | #ifdef CONFIG_KMAP_LOCAL |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 102 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
Thomas Gleixner | 157e118 | 2020-11-03 10:27:20 +0100 | [diff] [blame] | 103 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 104 | #ifdef CONFIG_PCI_MMCONFIG |
| 105 | FIX_PCIE_MCFG, |
| 106 | #endif |
| 107 | #endif |
Juergen Gross | ecac718 | 2020-08-15 12:06:38 +0200 | [diff] [blame] | 108 | #ifdef CONFIG_PARAVIRT_XXL |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 109 | FIX_PARAVIRT_BOOTMAP, |
| 110 | #endif |
Thomas Garnier | 69218e4 | 2017-03-14 10:05:07 -0700 | [diff] [blame] | 111 | |
James Morse | 4f89fa2 | 2017-11-06 18:44:24 +0000 | [diff] [blame] | 112 | #ifdef CONFIG_ACPI_APEI_GHES |
| 113 | /* Used for GHES mapping from assorted contexts */ |
| 114 | FIX_APEI_GHES_IRQ, |
| 115 | FIX_APEI_GHES_NMI, |
| 116 | #endif |
| 117 | |
Arjan van de Ven | fa36e95 | 2011-01-11 10:55:56 +0000 | [diff] [blame] | 118 | __end_of_permanent_fixed_addresses, |
| 119 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 120 | /* |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 121 | * 512 temporary boot-time mappings, used by early_ioremap(), |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 122 | * before ioremap() is functional. |
| 123 | * |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 124 | * If necessary we round it up to the next 512 pages boundary so |
Cao jin | c84b82d | 2019-08-09 19:46:12 +0800 | [diff] [blame] | 125 | * that we can have a single pmd entry and a single pte table: |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 126 | */ |
| 127 | #define NR_FIX_BTMAPS 64 |
Dave Young | 3eddc69 | 2014-08-26 17:06:41 +0800 | [diff] [blame] | 128 | #define FIX_BTMAPS_SLOTS 8 |
Jan Beulich | 499a5f1 | 2009-12-18 16:05:51 +0000 | [diff] [blame] | 129 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
| 130 | FIX_BTMAP_END = |
| 131 | (__end_of_permanent_fixed_addresses ^ |
| 132 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
| 133 | -PTRS_PER_PTE |
| 134 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
| 135 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
| 136 | : __end_of_permanent_fixed_addresses, |
| 137 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 138 | #ifdef CONFIG_X86_32 |
| 139 | FIX_WP_TEST, |
| 140 | #endif |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 141 | #ifdef CONFIG_INTEL_TXT |
| 142 | FIX_TBOOT_BASE, |
| 143 | #endif |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 144 | __end_of_fixed_addresses |
| 145 | }; |
| 146 | |
| 147 | |
| 148 | extern void reserve_top_address(unsigned long reserve); |
| 149 | |
William Grant | 55f49fc | 2018-01-30 22:22:55 +1100 | [diff] [blame] | 150 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
| 151 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
| 152 | #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
| 153 | #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) |
Ingo Molnar | 3ec9678 | 2008-04-25 18:25:25 +0200 | [diff] [blame] | 154 | |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 155 | extern int fixmaps_set; |
| 156 | |
Keith Packard | fd94093 | 2008-10-30 19:37:09 -0700 | [diff] [blame] | 157 | extern pte_t *pkmap_page_table; |
| 158 | |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 159 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
Sami Tolvanen | f53e2cd | 2019-09-13 14:14:02 -0700 | [diff] [blame] | 160 | void native_set_fixmap(unsigned /* enum fixed_addresses */ idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 161 | phys_addr_t phys, pgprot_t flags); |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 162 | |
Juergen Gross | fdc0269 | 2018-08-28 09:40:25 +0200 | [diff] [blame] | 163 | #ifndef CONFIG_PARAVIRT_XXL |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 164 | static inline void __set_fixmap(enum fixed_addresses idx, |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 165 | phys_addr_t phys, pgprot_t flags) |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 166 | { |
| 167 | native_set_fixmap(idx, phys, flags); |
| 168 | } |
| 169 | #endif |
| 170 | |
Tom Lendacky | 21729f8 | 2017-07-17 16:10:07 -0500 | [diff] [blame] | 171 | /* |
| 172 | * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not |
| 173 | * supported for MMIO addresses, so make sure that the memory encryption |
| 174 | * mask is not part of the page attributes. |
| 175 | */ |
| 176 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE |
| 177 | |
Tom Lendacky | f88a68f | 2017-07-17 16:10:09 -0500 | [diff] [blame] | 178 | /* |
| 179 | * Early memremap routines used for in-place encryption. The mappings created |
| 180 | * by these routines are intended to be used as temporary mappings. |
| 181 | */ |
| 182 | void __init *early_memremap_encrypted(resource_size_t phys_addr, |
| 183 | unsigned long size); |
| 184 | void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, |
| 185 | unsigned long size); |
| 186 | void __init *early_memremap_decrypted(resource_size_t phys_addr, |
| 187 | unsigned long size); |
| 188 | void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, |
| 189 | unsigned long size); |
| 190 | |
Mark Salter | 114cefc | 2014-01-23 15:53:50 -0800 | [diff] [blame] | 191 | #include <asm-generic/fixmap.h> |
Feng Tang | 5a47c7d | 2010-09-13 15:08:54 +0800 | [diff] [blame] | 192 | |
Mark Salter | 5b7c73e | 2014-04-07 15:39:49 -0700 | [diff] [blame] | 193 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
| 194 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
| 195 | |
| 196 | void __early_set_fixmap(enum fixed_addresses idx, |
| 197 | phys_addr_t phys, pgprot_t flags); |
| 198 | |
Gustavo F. Padovan | c577b09 | 2009-02-15 21:48:59 -0300 | [diff] [blame] | 199 | #endif /* !__ASSEMBLY__ */ |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 200 | #endif /* _ASM_X86_FIXMAP_H */ |