[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: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

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