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authorJan Beulich <jbeulich@novell.com>2006-01-17 07:03:32 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-16 23:18:35 -0800
commitf0cf5d1a34725f3eab39120204da4afa43874269 (patch)
tree14d87fb5f2f3ace1294d85f8a9fd3666ce33ec8d
parent0addb142afa12a9bdf6cc53d3e86670c59c82d8f (diff)
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[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>
-rw-r--r--arch/x86_64/kernel/head.S108
1 files changed, 37 insertions, 71 deletions
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 38fc3d5112e..692c737fedd 100644
--- 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