mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 15:34:48 +08:00
124 lines
3.6 KiB
C
124 lines
3.6 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
|
|
*
|
|
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
|
|
*/
|
|
|
|
#ifndef _ASM_FIXMAP_32_H
|
|
#define _ASM_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 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,
|
|
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
|