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 */ 12 13 #ifndef _ASM_X86_FIXMAP_32_H 14 #define _ASM_X86_FIXMAP_32_H 15 16 17 /* used by vmalloc.c, vsyscall.lds.S. 18 * 19 * Leave one empty page between vmalloc'ed areas and 20 * the start of the fixmap. 21 */ 22 extern unsigned long __FIXADDR_TOP; 23 #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) 24 #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) 25 26 #ifndef __ASSEMBLY__ 27 #include <linux/kernel.h> 28 #include <asm/acpi.h> 29 #include <asm/apicdef.h> 30 #include <asm/page.h> 31 #include <linux/threads.h> 32 #include <asm/kmap_types.h> 33 34 /* 35 * Here we define all the compile-time 'special' virtual 36 * addresses. The point is to have a constant address at 37 * compile time, but to set the physical address only 38 * in the boot process. We allocate these special addresses 39 * from the end of virtual memory (0xfffff000) backwards. 40 * Also this lets us do fail-safe vmalloc(), we 41 * can guarantee that these special addresses and 42 * vmalloc()-ed addresses never overlap. 43 * 44 * these 'compile-time allocated' memory buffers are 45 * fixed-size 4k pages. (or larger if used with an increment 46 * highger than 1) use fixmap_set(idx,phys) to associate 47 * physical memory with fixmap indices. 48 * 49 * TLB entries of such buffers will not be flushed across 50 * task switches. 51 */ 52 enum fixed_addresses { 53 FIX_HOLE, 54 FIX_VDSO, 55 FIX_DBGP_BASE, 56 FIX_EARLYCON_MEM_BASE, 57 #ifdef CONFIG_X86_LOCAL_APIC 58 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ 59 #endif 60 #ifdef CONFIG_X86_IO_APIC 61 FIX_IO_APIC_BASE_0, 62 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1, 63 #endif 64 #ifdef CONFIG_X86_VISWS_APIC 65 FIX_CO_CPU, /* Cobalt timer */ 66 FIX_CO_APIC, /* Cobalt APIC Redirection Table */ 67 FIX_LI_PCIA, /* Lithium PCI Bridge A */ 68 FIX_LI_PCIB, /* Lithium PCI Bridge B */ 69 #endif 70 #ifdef CONFIG_X86_F00F_BUG 71 FIX_F00F_IDT, /* Virtual mapping for IDT */ 72 #endif 73 #ifdef CONFIG_X86_CYCLONE_TIMER 74 FIX_CYCLONE_TIMER, /*cyclone timer register*/ 75 #endif 76 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ 77 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, 78 #ifdef CONFIG_PCI_MMCONFIG 79 FIX_PCIE_MCFG, 80 #endif 81 #ifdef CONFIG_PARAVIRT 82 FIX_PARAVIRT_BOOTMAP, 83 #endif 84 __end_of_permanent_fixed_addresses, 85 /* 86 * 256 temporary boot-time mappings, used by early_ioremap(), 87 * before ioremap() is functional. 88 * 89 * We round it up to the next 256 pages boundary so that we 90 * can have a single pgd entry and a single pte table: 91 */ 92 #define NR_FIX_BTMAPS 64 93 #define FIX_BTMAPS_SLOTS 4 94 FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 - 95 (__end_of_permanent_fixed_addresses & 255), 96 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1, 97 FIX_WP_TEST, 98 #ifdef CONFIG_ACPI 99 FIX_ACPI_BEGIN, 100 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1, 101 #endif 102 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 103 FIX_OHCI1394_BASE, 104 #endif 105 __end_of_fixed_addresses 106 }; 107 108 extern void reserve_top_address(unsigned long reserve); 109 110 111 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) 112 113 #define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 114 #define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 115 #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) 116 #define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE) 117 118 #endif /* !__ASSEMBLY__ */ 119 #endif /* _ASM_X86_FIXMAP_32_H */ 120