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 /* 18 * Exposed to assembly code for setting up initial page tables. Cannot be 19 * calculated in assembly code (fixmap entries are an enum), but is sanity 20 * checked in the actual fixmap C code to make sure that the fixmap is 21 * covered fully. 22 */ 23 #define FIXMAP_PMD_NUM 2 24 /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ 25 #define FIXMAP_PMD_TOP 507 26 27 #ifndef __ASSEMBLY__ 28 #include <linux/kernel.h> 29 #include <asm/acpi.h> 30 #include <asm/apicdef.h> 31 #include <asm/page.h> 32 #ifdef CONFIG_X86_32 33 #include <linux/threads.h> 34 #include <asm/kmap_types.h> 35 #else 36 #include <uapi/asm/vsyscall.h> 37 #endif 38 39 /* 40 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall 41 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. 42 * Because of this, FIXADDR_TOP x86 integration was left as later work. 43 */ 44 #ifdef CONFIG_X86_32 45 /* used by vmalloc.c, vsyscall.lds.S. 46 * 47 * Leave one empty page between vmalloc'ed areas and 48 * the start of the fixmap. 49 */ 50 extern unsigned long __FIXADDR_TOP; 51 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) 52 #else 53 #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ 54 PAGE_SIZE) 55 #endif 56 57 /* 58 * Here we define all the compile-time 'special' virtual 59 * addresses. The point is to have a constant address at 60 * compile time, but to set the physical address only 61 * in the boot process. 62 * for x86_32: We allocate these special addresses 63 * from the end of virtual memory (0xfffff000) backwards. 64 * Also this lets us do fail-safe vmalloc(), we 65 * can guarantee that these special addresses and 66 * vmalloc()-ed addresses never overlap. 67 * 68 * These 'compile-time allocated' memory buffers are 69 * fixed-size 4k pages (or larger if used with an increment 70 * higher than 1). Use set_fixmap(idx,phys) to associate 71 * physical memory with fixmap indices. 72 * 73 * TLB entries of such buffers will not be flushed across 74 * task switches. 75 */ 76 enum fixed_addresses { 77 #ifdef CONFIG_X86_32 78 FIX_HOLE, 79 #else 80 #ifdef CONFIG_X86_VSYSCALL_EMULATION 81 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, 82 #endif 83 #endif 84 FIX_DBGP_BASE, 85 FIX_EARLYCON_MEM_BASE, 86 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 87 FIX_OHCI1394_BASE, 88 #endif 89 #ifdef CONFIG_X86_LOCAL_APIC 90 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ 91 #endif 92 #ifdef CONFIG_X86_IO_APIC 93 FIX_IO_APIC_BASE_0, 94 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, 95 #endif 96 #ifdef CONFIG_X86_32 97 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ 98 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, 99 #ifdef CONFIG_PCI_MMCONFIG 100 FIX_PCIE_MCFG, 101 #endif 102 #endif 103 #ifdef CONFIG_PARAVIRT 104 FIX_PARAVIRT_BOOTMAP, 105 #endif 106 #ifdef CONFIG_X86_INTEL_MID 107 FIX_LNW_VRTC, 108 #endif 109 110 #ifdef CONFIG_ACPI_APEI_GHES 111 /* Used for GHES mapping from assorted contexts */ 112 FIX_APEI_GHES_IRQ, 113 FIX_APEI_GHES_NMI, 114 #endif 115 116 __end_of_permanent_fixed_addresses, 117 118 /* 119 * 512 temporary boot-time mappings, used by early_ioremap(), 120 * before ioremap() is functional. 121 * 122 * If necessary we round it up to the next 512 pages boundary so 123 * that we can have a single pgd entry and a single pte table: 124 */ 125 #define NR_FIX_BTMAPS 64 126 #define FIX_BTMAPS_SLOTS 8 127 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 128 FIX_BTMAP_END = 129 (__end_of_permanent_fixed_addresses ^ 130 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & 131 -PTRS_PER_PTE 132 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 133 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) 134 : __end_of_permanent_fixed_addresses, 135 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 136 #ifdef CONFIG_X86_32 137 FIX_WP_TEST, 138 #endif 139 #ifdef CONFIG_INTEL_TXT 140 FIX_TBOOT_BASE, 141 #endif 142 __end_of_fixed_addresses 143 }; 144 145 146 extern void reserve_top_address(unsigned long reserve); 147 148 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 149 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 150 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 151 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) 152 153 extern int fixmaps_set; 154 155 extern pte_t *kmap_pte; 156 #define kmap_prot PAGE_KERNEL 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(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