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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/page-size.h>
#define FIXADDR_TOP (VMAP_VIRT_END - PAGE_SIZE)
#define FIXADDR_X_TOP (XEN_VIRT_END - PAGE_SIZE)
#ifndef __ASSEMBLY__
#include <xen/acpi.h>
#include <xen/pfn.h>
#include <asm/apicdef.h>
#include <asm/msi.h>
#include <acpi/apei.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 {
/* Index 0 is reserved since fix_to_virt(0) == FIXADDR_TOP. */
FIX_RESERVED,
/*
* Indexes using the page tables set up before entering __start_xen()
* must be among the first (L1_PAGETABLE_ENTRIES - 1) entries.
* These are generally those needed by the various console drivers.
*/
FIX_COM_BEGIN,
FIX_COM_END,
FIX_EHCI_DBGP,
#ifdef CONFIG_XEN_GUEST
FIX_PV_CONSOLE,
FIX_XEN_SHARED_INFO,
#endif /* CONFIG_XEN_GUEST */
/* Everything else should go further down. */
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 + NUM_FIXMAP_ACPI_PAGES - 1,
FIX_HPET_BASE,
FIX_TBOOT_SHARED_BASE,
FIX_MSIX_IO_RESERV_BASE,
FIX_MSIX_IO_RESERV_END = FIX_MSIX_IO_RESERV_BASE + FIX_MSIX_MAX_PAGES -1,
FIX_TBOOT_MAP_ADDRESS,
FIX_APEI_RANGE_BASE,
FIX_APEI_RANGE_END = FIX_APEI_RANGE_BASE + FIX_APEI_RANGE_MAX -1,
FIX_EFI_MPF,
__end_of_fixed_addresses
};
#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 mfn, unsigned long flags);
#define set_fixmap(idx, phys) \
__set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR)
#define set_fixmap_nocache(idx, phys) \
__set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_UCMINUS)
#define clear_fixmap(idx) __set_fixmap(idx, 0, 0)
#define __fix_to_virt(x) gcc11_wrap(FIXADDR_TOP - ((x) << PAGE_SHIFT))
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
#define fix_to_virt(x) ((void *)__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);
}
enum fixed_addresses_x {
/* Index 0 is reserved since fix_x_to_virt(0) == FIXADDR_X_TOP. */
FIX_X_RESERVED,
#ifdef CONFIG_HYPERV_GUEST
FIX_X_HYPERV_HCALL,
#endif
__end_of_fixed_addresses_x
};
#define FIXADDR_X_SIZE (__end_of_fixed_addresses_x << PAGE_SHIFT)
#define FIXADDR_X_START (FIXADDR_X_TOP - FIXADDR_X_SIZE)
extern void __set_fixmap_x(
enum fixed_addresses_x idx, unsigned long mfn, unsigned long flags);
#define set_fixmap_x(idx, phys) \
__set_fixmap_x(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_RX | MAP_SMALL_PAGES)
#define clear_fixmap_x(idx) __set_fixmap_x(idx, 0, 0)
#define __fix_x_to_virt(x) (FIXADDR_X_TOP - ((x) << PAGE_SHIFT))
#define fix_x_to_virt(x) ((void *)__fix_x_to_virt(x))
#endif /* __ASSEMBLY__ */
#endif
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