mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 23:45:31 +08:00
f34fa82b19
and let 64-bit to fall back to use fixmap too. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
|
|
* 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_HPET_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
|