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 111 112 #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 117 118 __end_of_permanent_fixed_addresses, 119 120 /* 121 * 512 temporary boot-time mappings, used by early_ioremap(), 122 * before ioremap() is functional. 123 * 124 * If necessary we round it up to the next 512 pages boundary so 125 * that we can have a single pmd entry and a single pte table: 126 */ 127 #define NR_FIX_BTMAPS 64 128 #define FIX_BTMAPS_SLOTS 8 129 #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, 138 #ifdef CONFIG_X86_32 139 FIX_WP_TEST, 140 #endif 141 #ifdef CONFIG_INTEL_TXT 142 FIX_TBOOT_BASE, 143 #endif 144 __end_of_fixed_addresses 145 }; 146 147 148 extern void reserve_top_address(unsigned long reserve); 149 150 #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) 154 155 extern int fixmaps_set; 156 157 extern pte_t *pkmap_page_table; 158 159 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); 160 void native_set_fixmap(unsigned /* enum fixed_addresses */ idx, 161 phys_addr_t phys, pgprot_t flags); 162 163 #ifndef CONFIG_PARAVIRT_XXL 164 static inline void __set_fixmap(enum fixed_addresses idx, 165 phys_addr_t phys, pgprot_t flags) 166 { 167 native_set_fixmap(idx, phys, flags); 168 } 169 #endif 170 171 /* 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 177 178 /* 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); 190 191 #include <asm-generic/fixmap.h> 192 193 #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); 198 199 #endif /* !__ASSEMBLY__ */ 200 #endif /* _ASM_X86_FIXMAP_H */ 201