This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-x86_64 / mach-xen / asm / fixmap.h

diff --git a/include/asm-x86_64/mach-xen/asm/fixmap.h b/include/asm-x86_64/mach-xen/asm/fixmap.h
new file mode 100644 (file)
index 0000000..860ce83
--- /dev/null
+++ b/include/asm-x86_64/mach-xen/asm/fixmap.h
@@ -0,0 +1,114 @@
+/*
+ * 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
+ */
+
+#ifndef _ASM_FIXMAP_H
+#define _ASM_FIXMAP_H
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <asm/apicdef.h>
+#include <xen/gnttab.h>
+#include <asm/page.h>
+#include <asm/vsyscall.h>
+#include <asm/vsyscall32.h>
+#include <asm/acpi.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.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * highger than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ * TLB entries of such buffers will not be flushed across
+ * task switches.
+ */
+
+enum fixed_addresses {
+       VSYSCALL_LAST_PAGE,
+       VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
+       VSYSCALL_HPET,
+       FIX_HPET_BASE,
+#ifdef CONFIG_X86_LOCAL_APIC
+       FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
+#endif
+#ifdef CONFIG_X86_IO_APIC
+       FIX_IO_APIC_BASE_0,
+       FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
+#endif
+#ifdef CONFIG_ACPI
+       FIX_ACPI_BEGIN,
+       FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
+#endif
+       FIX_SHARED_INFO,
+#define NR_FIX_ISAMAPS 256
+       FIX_ISAMAP_END,
+       FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
+       __end_of_permanent_fixed_addresses,
+       /* temporary boot-time mappings, used before ioremap() is functional */
+#define NR_FIX_BTMAPS  16
+       FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
+       FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
+       __end_of_fixed_addresses
+};
+
+extern void __set_fixmap (enum fixed_addresses idx,
+                                       unsigned long phys, pgprot_t flags);
+
+#define set_fixmap(idx, phys) \
+               __set_fixmap(idx, phys, PAGE_KERNEL)
+/*
+ * Some hardware wants to get fixmapped without caching.
+ */
+#define set_fixmap_nocache(idx, phys) \
+               __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
+
+#define clear_fixmap(idx) \
+                __set_fixmap(idx, 0, __pgprot(0))
+
+#define FIXADDR_TOP    (VSYSCALL_END-PAGE_SIZE)
+#define FIXADDR_SIZE   (__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START  (FIXADDR_TOP - FIXADDR_SIZE)
+
+/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
+#define FIXADDR_USER_START     ((unsigned long)VSYSCALL32_VSYSCALL)
+#define FIXADDR_USER_END       (FIXADDR_USER_START + PAGE_SIZE)
+
+#define __fix_to_virt(x)       (FIXADDR_TOP - ((x) << PAGE_SHIFT))
+
+extern void __this_fixmap_does_not_exist(void);
+
+/*
+ * 'index to address' translation. If anyone tries to use the idx
+ * directly without translation, we catch the bug with a NULL-deference
+ * kernel oops. Illegal ranges of incoming indices are caught too.
+ */
+static __always_inline unsigned long fix_to_virt(const unsigned int idx)
+{
+       /*
+        * this branch gets completely eliminated after inlining,
+        * except when someone tries to use fixaddr indices in an
+        * illegal way. (such as mixing up address types or using
+        * out-of-range indices).
+        *
+        * If it doesn't get removed, the linker will complain
+        * loudly with a reasonably clear error message..
+        */
+       if (idx >= __end_of_fixed_addresses)
+               __this_fixmap_does_not_exist();
+
+        return __fix_to_virt(idx);
+}
+
+#endif