x86, fixmap: prepare fixmap_32.h for unification

Impact: cleanup

Just prepare fixmap for later mechanic unification.
No real modification on code.

   text    data     bss     dec     hex filename
3831152  353188  372736 4557076  458914 vmlinux-32.after
3831152  353188  372736 4557076  458914 vmlinux-32.before

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Acked-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/include/asm/fixmap_32.h b/arch/x86/include/asm/fixmap_32.h
index d3fd0b9..8384df7 100644 (file)
--- a/arch/x86/include/asm/fixmap_32.h
+++ b/arch/x86/include/asm/fixmap_32.h
@@ -8,50 +8,80 @@
  * Copyright (C) 1998 Ingo Molnar
  *
  * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
+ * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
  */
 
 #ifndef _ASM_X86_FIXMAP_32_H
 #define _ASM_X86_FIXMAP_32_H
 
+#ifndef __ASSEMBLY__
+#include <linux/kernel.h>
+#include <asm/acpi.h>
+#include <asm/apicdef.h>
+#include <asm/page.h>
+#ifdef CONFIG_X86_32
+#include <linux/threads.h>
+#include <asm/kmap_types.h>
+#else
+#include <asm/vsyscall.h>
+#ifdef CONFIG_EFI
+#include <asm/efi.h>
+#endif
+#endif
 
+/*
+ * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
+ * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
+ * Because of this, FIXADDR_TOP x86 integration was left as later work.
+ */
+#ifdef CONFIG_X86_32
 /* used by vmalloc.c, vsyscall.lds.S.
  *
  * Leave one empty page between vmalloc'ed areas and
  * the start of the fixmap.
  */
 extern unsigned long __FIXADDR_TOP;
+#define FIXADDR_TOP    ((unsigned long)__FIXADDR_TOP)
+
 #define FIXADDR_USER_START     __fix_to_virt(FIX_VDSO)
 #define FIXADDR_USER_END       __fix_to_virt(FIX_VDSO - 1)
+#else
+#define FIXADDR_TOP    (VSYSCALL_END-PAGE_SIZE)
 
-#ifndef __ASSEMBLY__
-#include <linux/kernel.h>
-#include <asm/acpi.h>
-#include <asm/apicdef.h>
-#include <asm/page.h>
-#include <linux/threads.h>
-#include <asm/kmap_types.h>
+/* 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)
+#endif
 
 /*
  * 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
+ * in the boot process.
+ * for x86_32: We allocate these special addresses
  * from the end of virtual memory (0xfffff000) backwards.
  * Also this lets us do fail-safe vmalloc(), we
  * can guarantee that these special addresses and
  * vmalloc()-ed addresses never overlap.
  *
- * 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
+ * These 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages (or larger if used with an increment
+ * higher than 1). Use set_fixmap(idx,phys) to associate
  * physical memory with fixmap indices.
  *
  * TLB entries of such buffers will not be flushed across
  * task switches.
  */
 enum fixed_addresses {
+#ifdef CONFIG_X86_32
        FIX_HOLE,
        FIX_VDSO,
+#else
+       VSYSCALL_LAST_PAGE,
+       VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
+                           + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
+       VSYSCALL_HPET,
+#endif
        FIX_DBGP_BASE,
        FIX_EARLYCON_MEM_BASE,
 #ifdef CONFIG_X86_LOCAL_APIC
@@ -59,7 +89,14 @@ enum fixed_addresses {
 #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,
+       FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
+#endif
+#ifdef CONFIG_X86_64
+#ifdef CONFIG_EFI
+       FIX_EFI_IO_MAP_LAST_PAGE,
+       FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
+                                 + MAX_EFI_IO_PAGES - 1,
+#endif
 #endif
 #ifdef CONFIG_X86_VISWS_APIC
        FIX_CO_CPU,     /* Cobalt timer */
@@ -73,15 +110,20 @@ enum fixed_addresses {
 #ifdef CONFIG_X86_CYCLONE_TIMER
        FIX_CYCLONE_TIMER, /*cyclone timer register*/
 #endif
+#ifdef CONFIG_X86_32
        FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
        FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
 #ifdef CONFIG_PCI_MMCONFIG
        FIX_PCIE_MCFG,
 #endif
+#endif
 #ifdef CONFIG_PARAVIRT
        FIX_PARAVIRT_BOOTMAP,
 #endif
        __end_of_permanent_fixed_addresses,
+#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
+       FIX_OHCI1394_BASE,
+#endif
        /*
         * 256 temporary boot-time mappings, used by early_ioremap(),
         * before ioremap() is functional.
@@ -94,17 +136,14 @@ enum fixed_addresses {
        FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
                        (__end_of_permanent_fixed_addresses & 255),
        FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1,
+#ifdef CONFIG_X86_32
        FIX_WP_TEST,
-#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
-       FIX_OHCI1394_BASE,
 #endif
        __end_of_fixed_addresses
 };
 
-extern void reserve_top_address(unsigned long reserve);
-
 
-#define FIXADDR_TOP    ((unsigned long)__FIXADDR_TOP)
+extern void reserve_top_address(unsigned long reserve);
 
 #define FIXADDR_SIZE   (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
 #define FIXADDR_BOOT_SIZE      (__end_of_fixed_addresses << PAGE_SHIFT)