| 1 | /* |
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| 2 | * fixmap.h: compile-time virtual memory allocation |
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| 3 | * |
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| 4 | * This file is subject to the terms and conditions of the GNU General Public |
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| 5 | * License. See the file "COPYING" in the main directory of this archive |
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| 6 | * for more details. |
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| 7 | * |
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| 8 | * Copyright (C) 1998 Ingo Molnar |
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| 9 | * Modifications for Xen are copyright (c) 2002-2004, K A Fraser |
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| 10 | */ |
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| 11 | |
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| 12 | #ifndef _ASM_FIXMAP_H |
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| 13 | #define _ASM_FIXMAP_H |
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| 14 | |
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| 15 | #include <xen/config.h> |
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| 16 | #include <asm/apicdef.h> |
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| 17 | #include <asm/acpi.h> |
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| 18 | #include <asm/page.h> |
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| 19 | #include <xen/kexec.h> |
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| 20 | |
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| 21 | /* |
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| 22 | * Here we define all the compile-time 'special' virtual |
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| 23 | * addresses. The point is to have a constant address at |
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| 24 | * compile time, but to set the physical address only |
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| 25 | * in the boot process. We allocate these special addresses |
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| 26 | * from the end of virtual memory backwards. |
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| 27 | */ |
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| 28 | enum fixed_addresses { |
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| 29 | #ifdef CONFIG_X86_PAE |
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| 30 | FIX_PAE_HIGHMEM_0, |
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| 31 | FIX_PAE_HIGHMEM_END = FIX_PAE_HIGHMEM_0 + NR_CPUS-1, |
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| 32 | #endif |
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| 33 | FIX_APIC_BASE, |
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| 34 | FIX_IO_APIC_BASE_0, |
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| 35 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1, |
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| 36 | FIX_ACPI_BEGIN, |
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| 37 | FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1, |
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| 38 | FIX_HPET_BASE, |
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| 39 | FIX_CYCLONE_TIMER, |
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| 40 | FIX_KEXEC_BASE_0, |
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| 41 | FIX_KEXEC_BASE_END = FIX_KEXEC_BASE_0 \ |
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| 42 | + ((KEXEC_XEN_NO_PAGES >> 1) * KEXEC_IMAGE_NR) - 1, |
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| 43 | __end_of_fixed_addresses |
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| 44 | }; |
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| 45 | |
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| 46 | #define FIXADDR_TOP (IOREMAP_VIRT_END - PAGE_SIZE) |
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| 47 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
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| 48 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
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| 49 | |
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| 50 | extern void __set_fixmap( |
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| 51 | enum fixed_addresses idx, unsigned long mfn, unsigned long flags); |
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| 52 | |
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| 53 | #define set_fixmap(idx, phys) \ |
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| 54 | __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR) |
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| 55 | |
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| 56 | #define set_fixmap_nocache(idx, phys) \ |
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| 57 | __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_NOCACHE) |
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| 58 | |
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| 59 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
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| 60 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) |
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| 61 | |
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| 62 | #define fix_to_virt(x) (__fix_to_virt(x)) |
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| 63 | |
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| 64 | static inline unsigned long virt_to_fix(const unsigned long vaddr) |
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| 65 | { |
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| 66 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); |
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| 67 | return __virt_to_fix(vaddr); |
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| 68 | } |
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| 69 | |
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| 70 | #endif |
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