2 * fixmap.h: compile-time virtual memory allocation
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
8 * Copyright (C) 1998 Ingo Molnar
10 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
13 #ifndef _ASM_X86_FIXMAP_32_H
14 #define _ASM_X86_FIXMAP_32_H
17 /* used by vmalloc.c, vsyscall.lds.S.
19 * Leave one empty page between vmalloc'ed areas and
20 * the start of the fixmap.
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)
27 #include <linux/kernel.h>
29 #include <asm/apicdef.h>
31 #include <linux/threads.h>
32 #include <asm/kmap_types.h>
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.
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.
49 * TLB entries of such buffers will not be flushed across
52 enum fixed_addresses {
56 FIX_EARLYCON_MEM_BASE,
57 #ifdef CONFIG_X86_LOCAL_APIC
58 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
60 #ifdef CONFIG_X86_IO_APIC
62 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
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 */
70 #ifdef CONFIG_X86_F00F_BUG
71 FIX_F00F_IDT, /* Virtual mapping for IDT */
73 #ifdef CONFIG_X86_CYCLONE_TIMER
74 FIX_CYCLONE_TIMER, /*cyclone timer register*/
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
81 #ifdef CONFIG_PARAVIRT
84 __end_of_permanent_fixed_addresses,
86 * 256 temporary boot-time mappings, used by early_ioremap(),
87 * before ioremap() is functional.
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:
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,
100 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
102 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
105 __end_of_fixed_addresses
108 extern void reserve_top_address(unsigned long reserve);
111 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
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)
118 #endif /* !__ASSEMBLY__ */
119 #endif /* _ASM_X86_FIXMAP_32_H */