/* * fixmap.h: compile-time virtual memory allocation * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998 Ingo Molnar * * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 */ #ifndef ASM_X86__FIXMAP_32_H #define ASM_X86__FIXMAP_32_H /* used by vmalloc.c, vsyscall.lds.S. * * Leave one empty page between vmalloc'ed areas and * the start of the fixmap. */ extern unsigned long __FIXADDR_TOP; #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) #ifndef __ASSEMBLY__ #include <linux/kernel.h> #include <asm/acpi.h> #include <asm/apicdef.h> #include <asm/page.h> #ifdef CONFIG_HIGHMEM #include <linux/threads.h> #include <asm/kmap_types.h> #endif /* * Here we define all the compile-time 'special' virtual * addresses. The point is to have a constant address at * compile time, but to set the physical address only * in the boot process. We allocate these special addresses * from the end of virtual memory (0xfffff000) backwards. * Also this lets us do fail-safe vmalloc(), we * can guarantee that these special addresses and * vmalloc()-ed addresses never overlap. * * these 'compile-time allocated' memory buffers are * fixed-size 4k pages. (or larger if used with an increment * highger than 1) use fixmap_set(idx,phys) to associate * physical memory with fixmap indices. * * TLB entries of such buffers will not be flushed across * task switches. */ enum fixed_addresses { FIX_HOLE, FIX_VDSO, FIX_DBGP_BASE, FIX_EARLYCON_MEM_BASE, #ifdef CONFIG_X86_LOCAL_APIC FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ #endif #ifdef CONFIG_X86_IO_APIC FIX_IO_APIC_BASE_0, FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1, #endif #ifdef CONFIG_X86_VISWS_APIC FIX_CO_CPU, /* Cobalt timer */ FIX_CO_APIC, /* Cobalt APIC Redirection Table */ FIX_LI_PCIA, /* Lithium PCI Bridge A */ FIX_LI_PCIB, /* Lithium PCI Bridge B */ #endif #ifdef CONFIG_X86_F00F_BUG FIX_F00F_IDT, /* Virtual mapping for IDT */ #endif #ifdef CONFIG_X86_CYCLONE_TIMER FIX_CYCLONE_TIMER, /*cyclone timer register*/ #endif #ifdef CONFIG_HIGHMEM FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, #endif #ifdef CONFIG_PCI_MMCONFIG FIX_PCIE_MCFG, #endif #ifdef CONFIG_PARAVIRT FIX_PARAVIRT_BOOTMAP, #endif __end_of_permanent_fixed_addresses, /* * 256 temporary boot-time mappings, used by early_ioremap(), * before ioremap() is functional. * * We round it up to the next 256 pages boundary so that we * can have a single pgd entry and a single pte table: */ #define NR_FIX_BTMAPS 64 #define FIX_BTMAPS_SLOTS 4 FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 - (__end_of_permanent_fixed_addresses & 255), FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1, FIX_WP_TEST, #ifdef CONFIG_ACPI FIX_ACPI_BEGIN, FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1, #endif #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT FIX_OHCI1394_BASE, #endif __end_of_fixed_addresses }; extern void reserve_top_address(unsigned long reserve); #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) #define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) #define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) #define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE) #endif /* !__ASSEMBLY__ */ #endif /* ASM_X86__FIXMAP_32_H */