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171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
/*
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* fixmap.h: compile-time virtual memory allocation
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1998 Ingo Molnar
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*
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
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*/
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#ifndef _ASM_X86_FIXMAP_H
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#define _ASM_X86_FIXMAP_H
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <asm/acpi.h>
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#include <asm/apicdef.h>
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#include <asm/page.h>
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#include <asm/pvclock.h>
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#ifdef CONFIG_X86_32
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#include <linux/threads.h>
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#include <asm/kmap_types.h>
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#else
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#include <uapi/asm/vsyscall.h>
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#endif
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/*
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* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
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* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
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* Because of this, FIXADDR_TOP x86 integration was left as later work.
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*/
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#ifdef CONFIG_X86_32
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/* used by vmalloc.c, vsyscall.lds.S.
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*
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* Leave one empty page between vmalloc'ed areas and
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* the start of the fixmap.
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*/
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extern unsigned long __FIXADDR_TOP;
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#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
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#else
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#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
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PAGE_SIZE)
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#endif
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/*
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* Here we define all the compile-time 'special' virtual
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* addresses. The point is to have a constant address at
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* compile time, but to set the physical address only
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* in the boot process.
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* for x86_32: We allocate these special addresses
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* from the end of virtual memory (0xfffff000) backwards.
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* Also this lets us do fail-safe vmalloc(), we
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* can guarantee that these special addresses and
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* vmalloc()-ed addresses never overlap.
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*
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* These 'compile-time allocated' memory buffers are
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* fixed-size 4k pages (or larger if used with an increment
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* higher than 1). Use set_fixmap(idx,phys) to associate
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* physical memory with fixmap indices.
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*
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* TLB entries of such buffers will not be flushed across
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* task switches.
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*/
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enum fixed_addresses {
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#ifdef CONFIG_X86_32
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FIX_HOLE,
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#else
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#ifdef CONFIG_X86_VSYSCALL_EMULATION
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VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
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#endif
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#ifdef CONFIG_PARAVIRT_CLOCK
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PVCLOCK_FIXMAP_BEGIN,
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PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
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#endif
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#endif
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FIX_DBGP_BASE,
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FIX_EARLYCON_MEM_BASE,
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#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
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FIX_OHCI1394_BASE,
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
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#endif
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#ifdef CONFIG_X86_IO_APIC
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FIX_IO_APIC_BASE_0,
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FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
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#endif
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FIX_RO_IDT, /* Virtual mapping for read-only IDT */
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#ifdef CONFIG_X86_32
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FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
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FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
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#ifdef CONFIG_PCI_MMCONFIG
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FIX_PCIE_MCFG,
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#endif
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#endif
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#ifdef CONFIG_PARAVIRT
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FIX_PARAVIRT_BOOTMAP,
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#endif
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FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
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FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
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#ifdef CONFIG_X86_INTEL_MID
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FIX_LNW_VRTC,
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#endif
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__end_of_permanent_fixed_addresses,
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/*
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* 512 temporary boot-time mappings, used by early_ioremap(),
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* before ioremap() is functional.
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*
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* If necessary we round it up to the next 512 pages boundary so
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* that we can have a single pgd entry and a single pte table:
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*/
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#define NR_FIX_BTMAPS 64
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#define FIX_BTMAPS_SLOTS 8
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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FIX_BTMAP_END =
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(__end_of_permanent_fixed_addresses ^
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(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
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-PTRS_PER_PTE
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? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
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(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
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: __end_of_permanent_fixed_addresses,
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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#ifdef CONFIG_X86_32
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FIX_WP_TEST,
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#endif
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#ifdef CONFIG_INTEL_TXT
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FIX_TBOOT_BASE,
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#endif
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__end_of_fixed_addresses
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};
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extern void reserve_top_address(unsigned long reserve);
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#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
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extern int fixmaps_set;
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extern pte_t *kmap_pte;
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extern pgprot_t kmap_prot;
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extern pte_t *pkmap_page_table;
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void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
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void native_set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags);
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#ifndef CONFIG_PARAVIRT
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static inline void __set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags)
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{
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native_set_fixmap(idx, phys, flags);
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}
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#endif
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#include <asm-generic/fixmap.h>
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#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
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#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
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void __early_set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_FIXMAP_H */
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