mirror of https://gitee.com/openkylin/linux.git
219 lines
6.4 KiB
C
219 lines
6.4 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
|
|
* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
|
|
*/
|
|
|
|
#ifndef _ASM_X86_FIXMAP_H
|
|
#define _ASM_X86_FIXMAP_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/kernel.h>
|
|
#include <asm/acpi.h>
|
|
#include <asm/apicdef.h>
|
|
#include <asm/page.h>
|
|
#ifdef CONFIG_X86_32
|
|
#include <linux/threads.h>
|
|
#include <asm/kmap_types.h>
|
|
#else
|
|
#include <asm/vsyscall.h>
|
|
#endif
|
|
|
|
/*
|
|
* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
|
|
* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
|
|
* Because of this, FIXADDR_TOP x86 integration was left as later work.
|
|
*/
|
|
#ifdef CONFIG_X86_32
|
|
/* 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_TOP ((unsigned long)__FIXADDR_TOP)
|
|
|
|
#define FIXADDR_USER_START __fix_to_virt(FIX_VDSO)
|
|
#define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1)
|
|
#else
|
|
#define FIXADDR_TOP (VSYSCALL_END-PAGE_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
|
|
|
|
|
|
/*
|
|
* 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.
|
|
* for x86_32: 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
|
|
* 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 {
|
|
#ifdef CONFIG_X86_32
|
|
FIX_HOLE,
|
|
FIX_VDSO,
|
|
#else
|
|
VSYSCALL_LAST_PAGE,
|
|
VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
|
|
+ ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
|
|
VSYSCALL_HPET,
|
|
#endif
|
|
FIX_DBGP_BASE,
|
|
FIX_EARLYCON_MEM_BASE,
|
|
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
|
|
FIX_OHCI1394_BASE,
|
|
#endif
|
|
#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_X86_32
|
|
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
|
|
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
|
|
#ifdef CONFIG_PCI_MMCONFIG
|
|
FIX_PCIE_MCFG,
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_PARAVIRT
|
|
FIX_PARAVIRT_BOOTMAP,
|
|
#endif
|
|
FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
|
|
FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
|
|
__end_of_permanent_fixed_addresses,
|
|
/*
|
|
* 256 temporary boot-time mappings, used by early_ioremap(),
|
|
* before ioremap() is functional.
|
|
*
|
|
* If necessary 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
|
|
#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
|
|
FIX_BTMAP_END =
|
|
(__end_of_permanent_fixed_addresses ^
|
|
(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
|
|
-PTRS_PER_PTE
|
|
? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
|
|
(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
|
|
: __end_of_permanent_fixed_addresses,
|
|
FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
|
|
#ifdef CONFIG_X86_32
|
|
FIX_WP_TEST,
|
|
#endif
|
|
#ifdef CONFIG_INTEL_TXT
|
|
FIX_TBOOT_BASE,
|
|
#endif
|
|
__end_of_fixed_addresses
|
|
};
|
|
|
|
|
|
extern void reserve_top_address(unsigned long reserve);
|
|
|
|
#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)
|
|
|
|
extern int fixmaps_set;
|
|
|
|
extern pte_t *kmap_pte;
|
|
extern pgprot_t kmap_prot;
|
|
extern pte_t *pkmap_page_table;
|
|
|
|
void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
|
|
void native_set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags);
|
|
|
|
#ifndef CONFIG_PARAVIRT
|
|
static inline void __set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags)
|
|
{
|
|
native_set_fixmap(idx, phys, flags);
|
|
}
|
|
#endif
|
|
|
|
#define set_fixmap(idx, phys) \
|
|
__set_fixmap(idx, phys, PAGE_KERNEL)
|
|
|
|
/*
|
|
* Some hardware wants to get fixmapped without caching.
|
|
*/
|
|
#define set_fixmap_nocache(idx, phys) \
|
|
__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
|
|
|
|
#define clear_fixmap(idx) \
|
|
__set_fixmap(idx, 0, __pgprot(0))
|
|
|
|
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
|
|
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
|
|
|
|
extern void __this_fixmap_does_not_exist(void);
|
|
|
|
/*
|
|
* 'index to address' translation. If anyone tries to use the idx
|
|
* directly without translation, we catch the bug with a NULL-deference
|
|
* kernel oops. Illegal ranges of incoming indices are caught too.
|
|
*/
|
|
static __always_inline unsigned long fix_to_virt(const unsigned int idx)
|
|
{
|
|
/*
|
|
* this branch gets completely eliminated after inlining,
|
|
* except when someone tries to use fixaddr indices in an
|
|
* illegal way. (such as mixing up address types or using
|
|
* out-of-range indices).
|
|
*
|
|
* If it doesn't get removed, the linker will complain
|
|
* loudly with a reasonably clear error message..
|
|
*/
|
|
if (idx >= __end_of_fixed_addresses)
|
|
__this_fixmap_does_not_exist();
|
|
|
|
return __fix_to_virt(idx);
|
|
}
|
|
|
|
static inline unsigned long virt_to_fix(const unsigned long vaddr)
|
|
{
|
|
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
|
|
return __virt_to_fix(vaddr);
|
|
}
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _ASM_X86_FIXMAP_H */
|