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 #ifndef __ASSEMBLY__ 18 #include <linux/kernel.h> 19 #include <asm/acpi.h> 20 #include <asm/apicdef.h> 21 #include <asm/page.h> 22 #ifdef CONFIG_X86_32 23 #include <linux/threads.h> 24 #include <asm/kmap_types.h> 25 #else 26 #include <uapi/asm/vsyscall.h> 27 #endif 28 29 /* 30 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall 31 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. 32 * Because of this, FIXADDR_TOP x86 integration was left as later work. 33 */ 34 #ifdef CONFIG_X86_32 35 /* used by vmalloc.c, vsyscall.lds.S. 36 * 37 * Leave one empty page between vmalloc'ed areas and 38 * the start of the fixmap. 39 */ 40 extern unsigned long __FIXADDR_TOP; 41 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) 42 #else 43 #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ 44 PAGE_SIZE) 45 #endif 46 47 /* 48 * Here we define all the compile-time 'special' virtual 49 * addresses. The point is to have a constant address at 50 * compile time, but to set the physical address only 51 * in the boot process. 52 * for x86_32: We allocate these special addresses 53 * from the end of virtual memory (0xfffff000) backwards. 54 * Also this lets us do fail-safe vmalloc(), we 55 * can guarantee that these special addresses and 56 * vmalloc()-ed addresses never overlap. 57 * 58 * These 'compile-time allocated' memory buffers are 59 * fixed-size 4k pages (or larger if used with an increment 60 * higher than 1). Use set_fixmap(idx,phys) to associate 61 * physical memory with fixmap indices. 62 * 63 * TLB entries of such buffers will not be flushed across 64 * task switches. 65 */ 66 enum fixed_addresses { 67 #ifdef CONFIG_X86_32 68 FIX_HOLE, 69 #else 70 #ifdef CONFIG_X86_VSYSCALL_EMULATION 71 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, 72 #endif 73 #endif 74 FIX_DBGP_BASE, 75 FIX_EARLYCON_MEM_BASE, 76 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 77 FIX_OHCI1394_BASE, 78 #endif 79 #ifdef CONFIG_X86_LOCAL_APIC 80 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ 81 #endif 82 #ifdef CONFIG_X86_IO_APIC 83 FIX_IO_APIC_BASE_0, 84 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, 85 #endif 86 #ifdef CONFIG_X86_32 87 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ 88 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, 89 #ifdef CONFIG_PCI_MMCONFIG 90 FIX_PCIE_MCFG, 91 #endif 92 #endif 93 #ifdef CONFIG_PARAVIRT 94 FIX_PARAVIRT_BOOTMAP, 95 #endif 96 FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ 97 FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ 98 #ifdef CONFIG_X86_INTEL_MID 99 FIX_LNW_VRTC, 100 #endif 101 102 #ifdef CONFIG_ACPI_APEI_GHES 103 /* Used for GHES mapping from assorted contexts */ 104 FIX_APEI_GHES_IRQ, 105 FIX_APEI_GHES_NMI, 106 #endif 107 108 __end_of_permanent_fixed_addresses, 109 110 /* 111 * 512 temporary boot-time mappings, used by early_ioremap(), 112 * before ioremap() is functional. 113 * 114 * If necessary we round it up to the next 512 pages boundary so 115 * that we can have a single pgd entry and a single pte table: 116 */ 117 #define NR_FIX_BTMAPS 64 118 #define FIX_BTMAPS_SLOTS 8 119 #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, 128 #ifdef CONFIG_X86_32 129 FIX_WP_TEST, 130 #endif 131 #ifdef CONFIG_INTEL_TXT 132 FIX_TBOOT_BASE, 133 #endif 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) 141 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 142 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 143 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) 144 145 extern int fixmaps_set; 146 147 extern pte_t *kmap_pte; 148 #define kmap_prot PAGE_KERNEL 149 extern pte_t *pkmap_page_table; 150 151 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); 152 void native_set_fixmap(enum fixed_addresses idx, 153 phys_addr_t phys, pgprot_t flags); 154 155 #ifndef CONFIG_PARAVIRT 156 static inline void __set_fixmap(enum fixed_addresses idx, 157 phys_addr_t phys, pgprot_t flags) 158 { 159 native_set_fixmap(idx, phys, flags); 160 } 161 #endif 162 163 /* 164 * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not 165 * supported for MMIO addresses, so make sure that the memory encryption 166 * mask is not part of the page attributes. 167 */ 168 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE 169 170 /* 171 * Early memremap routines used for in-place encryption. The mappings created 172 * by these routines are intended to be used as temporary mappings. 173 */ 174 void __init *early_memremap_encrypted(resource_size_t phys_addr, 175 unsigned long size); 176 void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, 177 unsigned long size); 178 void __init *early_memremap_decrypted(resource_size_t phys_addr, 179 unsigned long size); 180 void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, 181 unsigned long size); 182 183 #include <asm-generic/fixmap.h> 184 185 #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) 186 #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) 187 188 void __early_set_fixmap(enum fixed_addresses idx, 189 phys_addr_t phys, pgprot_t flags); 190 191 #endif /* !__ASSEMBLY__ */ 192 #endif /* _ASM_X86_FIXMAP_H */ 193