[PATCH] x86_64: eliminate empty_bad_{page,{pte,pmd}_table}

... as they are no longer needed. Since there were hard-coded numbers in the
file, the patch also adds a mechanism to avoid these (otherwise potential
future changes would again and again require adjusting these numbers).

Signed-Off-By: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 38fc3d5112e77cfbd66df249227440c6fa66edf1..692c737feddb05393525c3753e0ab285adc7164b 100644 (file)
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -241,104 +241,70 @@ ljumpvector:
 ENTRY(stext)
 ENTRY(_stext)
 
-.org 0x1000
-ENTRY(init_level4_pgt)
+       $page = 0
+#define NEXT_PAGE(name) \
+       $page = $page + 1; \
+       .org $page * 0x1000; \
+       phys_/**/name = $page * 0x1000 + __PHYSICAL_START; \
+ENTRY(name)
+
+NEXT_PAGE(init_level4_pgt)
        /* This gets initialized in x86_64_start_kernel */
        .fill   512,8,0
 
-.org 0x2000
-ENTRY(level3_ident_pgt)
-       .quad   0x0000000000004007 + __PHYSICAL_START
+NEXT_PAGE(level3_ident_pgt)
+       .quad   phys_level2_ident_pgt | 0x007
        .fill   511,8,0
 
-.org 0x3000
-ENTRY(level3_kernel_pgt)
+NEXT_PAGE(level3_kernel_pgt)
        .fill   510,8,0
        /* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
-       .quad   0x0000000000005007 + __PHYSICAL_START   /* -> level2_kernel_pgt */
+       .quad   phys_level2_kernel_pgt | 0x007
        .fill   1,8,0
 
-.org 0x4000
-ENTRY(level2_ident_pgt)
+NEXT_PAGE(level2_ident_pgt)
        /* 40MB for bootup.     */
-       .quad   0x0000000000000083
-       .quad   0x0000000000200083
-       .quad   0x0000000000400083
-       .quad   0x0000000000600083
-       .quad   0x0000000000800083
-       .quad   0x0000000000A00083
-       .quad   0x0000000000C00083
-       .quad   0x0000000000E00083
-       .quad   0x0000000001000083
-       .quad   0x0000000001200083
-       .quad   0x0000000001400083
-       .quad   0x0000000001600083
-       .quad   0x0000000001800083
-       .quad   0x0000000001A00083
-       .quad   0x0000000001C00083
-       .quad   0x0000000001E00083
-       .quad   0x0000000002000083
-       .quad   0x0000000002200083
-       .quad   0x0000000002400083
-       .quad   0x0000000002600083
+       i = 0
+       .rept 20
+       .quad   i << 21 | 0x083
+       i = i + 1
+       .endr
        /* Temporary mappings for the super early allocator in arch/x86_64/mm/init.c */
        .globl temp_boot_pmds
 temp_boot_pmds:
        .fill   492,8,0
        
-.org 0x5000
-ENTRY(level2_kernel_pgt)
+NEXT_PAGE(level2_kernel_pgt)
        /* 40MB kernel mapping. The kernel code cannot be bigger than that.
           When you change this change KERNEL_TEXT_SIZE in page.h too. */
        /* (2^48-(2*1024*1024*1024)-((2^39)*511)-((2^30)*510)) = 0 */
-       .quad   0x0000000000000183
-       .quad   0x0000000000200183
-       .quad   0x0000000000400183
-       .quad   0x0000000000600183
-       .quad   0x0000000000800183
-       .quad   0x0000000000A00183
-       .quad   0x0000000000C00183
-       .quad   0x0000000000E00183
-       .quad   0x0000000001000183
-       .quad   0x0000000001200183
-       .quad   0x0000000001400183
-       .quad   0x0000000001600183
-       .quad   0x0000000001800183
-       .quad   0x0000000001A00183
-       .quad   0x0000000001C00183
-       .quad   0x0000000001E00183
-       .quad   0x0000000002000183
-       .quad   0x0000000002200183
-       .quad   0x0000000002400183
-       .quad   0x0000000002600183
+       i = 0
+       .rept 20
+       .quad   i << 21 | 0x183
+       i = i + 1
+       .endr
        /* Module mapping starts here */
        .fill   492,8,0
 
-.org 0x6000
-ENTRY(empty_zero_page)
-
-.org 0x7000
-ENTRY(empty_bad_page)
+NEXT_PAGE(empty_zero_page)
 
-.org 0x8000
-ENTRY(empty_bad_pte_table)
+NEXT_PAGE(level3_physmem_pgt)
+       .quad   phys_level2_kernel_pgt | 0x007  /* so that __va works even before pagetable_init */
+       .fill   511,8,0
 
-.org 0x9000
-ENTRY(empty_bad_pmd_table)
+#undef NEXT_PAGE
 
-.org 0xa000
-ENTRY(level3_physmem_pgt)
-       .quad   0x0000000000005007 + __PHYSICAL_START   /* -> level2_kernel_pgt (so that __va works even before pagetable_init) */
+       .data
 
-       .org 0xb000
 #ifdef CONFIG_ACPI_SLEEP
+       .align PAGE_SIZE
 ENTRY(wakeup_level4_pgt)
-       .quad   0x0000000000002007 + __PHYSICAL_START   /* -> level3_ident_pgt */
+       .quad   phys_level3_ident_pgt | 0x007
        .fill   255,8,0
-       .quad   0x000000000000a007 + __PHYSICAL_START
+       .quad   phys_level3_physmem_pgt | 0x007
        .fill   254,8,0
        /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
-       .quad   0x0000000000003007 + __PHYSICAL_START   /* -> level3_kernel_pgt */
+       .quad   phys_level3_kernel_pgt | 0x007
 #endif
 
 #ifndef CONFIG_HOTPLUG_CPU
@@ -352,12 +318,12 @@ ENTRY(wakeup_level4_pgt)
         */
        .align PAGE_SIZE
 ENTRY(boot_level4_pgt)
-       .quad   0x0000000000002007 + __PHYSICAL_START   /* -> level3_ident_pgt */
+       .quad   phys_level3_ident_pgt | 0x007
        .fill   255,8,0
-       .quad   0x000000000000a007 + __PHYSICAL_START
+       .quad   phys_level3_physmem_pgt | 0x007
        .fill   254,8,0
        /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
-       .quad   0x0000000000003007 + __PHYSICAL_START   /* -> level3_kernel_pgt */
+       .quad   phys_level3_kernel_pgt | 0x007
 
        .data