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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [fixmap.h] - Blame information for rev 1765

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1 1275 phoenix
/*
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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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 */
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#ifndef _ASM_FIXMAP_H
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#define _ASM_FIXMAP_H
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <asm/apicdef.h>
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#include <asm/page.h>
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#include <asm/vsyscall.h>
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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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 *
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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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 * highger than 1) use fixmap_set(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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        VSYSCALL_LAST_PAGE,
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        VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
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        VSYSCALL_HPET,
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        FIX_HPET_BASE,
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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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        __end_of_fixed_addresses
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};
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extern void __set_fixmap (enum fixed_addresses idx,
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                                        unsigned long phys, pgprot_t flags);
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#define set_fixmap(idx, phys) \
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                __set_fixmap(idx, phys, PAGE_KERNEL)
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/*
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 * Some hardware wants to get fixmapped without caching.
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 */
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#define set_fixmap_nocache(idx, phys) \
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                __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
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#define FIXADDR_TOP     (VSYSCALL_END-PAGE_SIZE)
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#define FIXADDR_SIZE    (__end_of_fixed_addresses << PAGE_SHIFT)
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#define FIXADDR_START   (FIXADDR_TOP - FIXADDR_SIZE)
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#define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
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extern void __this_fixmap_does_not_exist(void);
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/*
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 * 'index to address' translation. If anyone tries to use the idx
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 * directly without tranlation, we catch the bug with a NULL-deference
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 * kernel oops. Illegal ranges of incoming indices are caught too.
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 */
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extern inline unsigned long fix_to_virt(const unsigned int idx)
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{
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        /*
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         * this branch gets completely eliminated after inlining,
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         * except when someone tries to use fixaddr indices in an
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         * illegal way. (such as mixing up address types or using
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         * out-of-range indices).
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         *
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         * If it doesn't get removed, the linker will complain
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         * loudly with a reasonably clear error message..
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         */
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        if (idx >= __end_of_fixed_addresses)
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                __this_fixmap_does_not_exist();
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        return __fix_to_virt(idx);
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}
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#endif

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