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 14 #ifndef _ASM_X86_FIXMAP_H 15 #define _ASM_X86_FIXMAP_H 16 17 #include <asm/kmap_size.h> 18 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 */ 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 31 /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ 32 #define FIXMAP_PMD_TOP 507 33 34 #ifndef __ASSEMBLY__ 35 #include <linux/kernel.h> 36 #include <asm/apicdef.h> 37 #include <asm/page.h> 38 #include <asm/pgtable_types.h> 39 #ifdef CONFIG_X86_32 40 #include <linux/threads.h> 41 #else 42 #include <uapi/asm/vsyscall.h> 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 51 /* 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) 57 #else 58 #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ 59 PAGE_SIZE) 60 #endif 61 62 /* 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, 84 #else 85 #ifdef CONFIG_X86_VSYSCALL_EMULATION 86 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, 87 #endif 88 #endif 89 FIX_DBGP_BASE, 90 FIX_EARLYCON_MEM_BASE, 91 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 92 FIX_OHCI1394_BASE, 93 #endif 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 101 #ifdef CONFIG_KMAP_LOCAL 102 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ 103 FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, 104 #ifdef CONFIG_PCI_MMCONFIG 105 FIX_PCIE_MCFG, 106 #endif 107 #endif 108 #ifdef CONFIG_PARAVIRT_XXL 109 FIX_PARAVIRT_BOOTMAP, 110 #endif 111 #ifdef CONFIG_X86_INTEL_MID 112 FIX_LNW_VRTC, 113 #endif 114 115 #ifdef CONFIG_ACPI_APEI_GHES 116 /* Used for GHES mapping from assorted contexts */ 117 FIX_APEI_GHES_IRQ, 118 FIX_APEI_GHES_NMI, 119 #endif 120 121 __end_of_permanent_fixed_addresses, 122 123 /* 124 * 512 temporary boot-time mappings, used by early_ioremap(), 125 * before ioremap() is functional. 126 * 127 * If necessary we round it up to the next 512 pages boundary so 128 * that we can have a single pmd entry and a single pte table: 129 */ 130 #define NR_FIX_BTMAPS 64 131 #define FIX_BTMAPS_SLOTS 8 132 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 133 FIX_BTMAP_END = 134 (__end_of_permanent_fixed_addresses ^ 135 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & 136 -PTRS_PER_PTE 137 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 138 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) 139 : __end_of_permanent_fixed_addresses, 140 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 141 #ifdef CONFIG_X86_32 142 FIX_WP_TEST, 143 #endif 144 #ifdef CONFIG_INTEL_TXT 145 FIX_TBOOT_BASE, 146 #endif 147 __end_of_fixed_addresses 148 }; 149 150 151 extern void reserve_top_address(unsigned long reserve); 152 153 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 154 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 155 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 156 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) 157 158 extern int fixmaps_set; 159 160 extern pte_t *pkmap_page_table; 161 162 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); 163 void native_set_fixmap(unsigned /* enum fixed_addresses */ idx, 164 phys_addr_t phys, pgprot_t flags); 165 166 #ifndef CONFIG_PARAVIRT_XXL 167 static inline void __set_fixmap(enum fixed_addresses idx, 168 phys_addr_t phys, pgprot_t flags) 169 { 170 native_set_fixmap(idx, phys, flags); 171 } 172 #endif 173 174 /* 175 * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not 176 * supported for MMIO addresses, so make sure that the memory encryption 177 * mask is not part of the page attributes. 178 */ 179 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE 180 181 /* 182 * Early memremap routines used for in-place encryption. The mappings created 183 * by these routines are intended to be used as temporary mappings. 184 */ 185 void __init *early_memremap_encrypted(resource_size_t phys_addr, 186 unsigned long size); 187 void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, 188 unsigned long size); 189 void __init *early_memremap_decrypted(resource_size_t phys_addr, 190 unsigned long size); 191 void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, 192 unsigned long size); 193 194 #include <asm-generic/fixmap.h> 195 196 #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) 197 #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) 198 199 void __early_set_fixmap(enum fixed_addresses idx, 200 phys_addr_t phys, pgprot_t flags); 201 202 #endif /* !__ASSEMBLY__ */ 203 #endif /* _ASM_X86_FIXMAP_H */ 204