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generated by cgit v1.2.3 (git 2.25.1) at 2025-11-27 05:18:02 +0000
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/*
 * 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
 * Modifications for Xen are copyright (c) 2002-2004, K A Fraser
 */

#ifndef _ASM_FIXMAP_H
#define _ASM_FIXMAP_H

#include <xen/config.h>
#include <asm/apicdef.h>
#include <asm/acpi.h>
#include <asm/page.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. We allocate these special addresses
 * from the end of virtual memory backwards.
 */
enum fixed_addresses {
    FIX_APIC_BASE,
    FIX_IO_APIC_BASE_0,
    FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
    FIX_ACPI_BEGIN,
    FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
    FIX_HPET_BASE,
    FIX_CYCLONE_TIMER,
    __end_of_fixed_addresses
};

#define FIXADDR_TOP   (IOREMAP_VIRT_END - PAGE_SIZE)
#define FIXADDR_SIZE  (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)

extern void __set_fixmap(
    enum fixed_addresses idx, unsigned long p, unsigned long flags);

#define set_fixmap(idx, phys) \
    __set_fixmap(idx, phys, PAGE_HYPERVISOR)

#define set_fixmap_nocache(idx, phys) \
    __set_fixmap(idx, phys, PAGE_HYPERVISOR_NOCACHE)

#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)

#define fix_to_virt(x)   (__fix_to_virt(x))

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