| /* |
| * 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 |
| */ |
| |
| #ifndef _ASM_FIXMAP_64_H |
| #define _ASM_FIXMAP_64_H |
| |
| #include <linux/kernel.h> |
| #include <asm/acpi.h> |
| #include <asm/apicdef.h> |
| #include <asm/page.h> |
| #include <asm/vsyscall.h> |
| #include <asm/efi.h> |
| |
| /* |
| * 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. |
| * |
| * These 'compile-time allocated' memory buffers are |
| * fixed-size 4k pages (or larger if used with an increment |
| * higher than 1). Use set_fixmap(idx,phys) to associate |
| * physical memory with fixmap indices. |
| * |
| * TLB entries of such buffers will not be flushed across |
| * task switches. |
| */ |
| |
| enum fixed_addresses { |
| VSYSCALL_LAST_PAGE, |
| VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE |
| + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1, |
| VSYSCALL_HPET, |
| FIX_DBGP_BASE, |
| FIX_EARLYCON_MEM_BASE, |
| FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
| FIX_IO_APIC_BASE_0, |
| FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
| FIX_EFI_IO_MAP_LAST_PAGE, |
| FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE |
| + MAX_EFI_IO_PAGES - 1, |
| #ifdef CONFIG_PARAVIRT |
| FIX_PARAVIRT_BOOTMAP, |
| #endif |
| #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_permanent_fixed_addresses, |
| /* |
| * 256 temporary boot-time mappings, used by early_ioremap(), |
| * before ioremap() is functional. |
| * |
| * We round it up to the next 512 pages boundary so that we |
| * can have a single pgd entry and a single pte table: |
| */ |
| #define NR_FIX_BTMAPS 64 |
| #define FIX_BTMAPS_NESTING 4 |
| FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 - |
| (__end_of_permanent_fixed_addresses & 511), |
| FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1, |
| __end_of_fixed_addresses |
| }; |
| |
| #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE) |
| #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
| #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
| |
| /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */ |
| #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL) |
| #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE) |
| |
| #endif |
