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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-02-27 13:27:38 -0800
committerH. Peter Anvin <hpa@zytor.com>2009-03-14 17:23:47 -0700
commitccf3fe02e35f4abca2589f99022cc25084bbd8ae (patch)
tree3bcf329116b8c689b4da1bb1a0d87bb587d3f3c7 /arch/x86
parent5368a2be34b96fda9c05d79424fa63a73ead04ed (diff)
x86-32: use brk segment for allocating initial kernel pagetable
Impact: use new interface instead of previous ad hoc implementation Rather than having special purpose init_pg_table_start/end variables to delimit the kernel pagetable built by head_32.S, just use the brk mechanism to extend the bss for the new pagetable. This patch removes init_pg_table_start/end and pg0, defines __brk_base (which is page-aligned and immediately follows _end), initializes the brk region to start there, and uses it for the 32-bit pagetable. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/pgtable_32.h3
-rw-r--r--arch/x86/include/asm/setup.h3
-rw-r--r--arch/x86/kernel/head32.c3
-rw-r--r--arch/x86/kernel/head_32.S14
-rw-r--r--arch/x86/kernel/setup.c6
-rw-r--r--arch/x86/kernel/vmlinux_32.lds.S4
-rw-r--r--arch/x86/lguest/boot.c8
7 files changed, 7 insertions, 34 deletions
diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index 97612fc7632f..31bd120cf2a2 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -42,9 +42,6 @@ extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
*/
#undef TEST_ACCESS_OK
-/* The boot page tables (all created as a single array) */
-extern unsigned long pg0[];
-
#ifdef CONFIG_X86_PAE
# include <asm/pgtable-3level.h>
#else
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 45454f3fa121..366d36639940 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -109,9 +109,6 @@ void *extend_brk(size_t size, size_t align);
void __init i386_start_kernel(void);
extern void probe_roms(void);
-extern unsigned long init_pg_tables_start;
-extern unsigned long init_pg_tables_end;
-
#else
void __init x86_64_start_kernel(char *real_mode);
void __init x86_64_start_reservations(char *real_mode_data);
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 29f1095b0849..3f8579f8d42c 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -29,9 +29,6 @@ void __init i386_start_kernel(void)
reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
}
#endif
- reserve_early(init_pg_tables_start, init_pg_tables_end,
- "INIT_PG_TABLE");
-
reserve_ebda_region();
/*
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index c32ca19d591a..db6652710e98 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -167,7 +167,7 @@ num_subarch_entries = (. - subarch_entries) / 4
/*
* Initialize page tables. This creates a PDE and a set of page
* tables, which are located immediately beyond _end. The variable
- * init_pg_tables_end is set up to point to the first "safe" location.
+ * _brk_end is set up to point to the first "safe" location.
* Mappings are created both at virtual address 0 (identity mapping)
* and PAGE_OFFSET for up to _end+sizeof(page tables)+INIT_MAP_BEYOND_END.
*
@@ -190,8 +190,7 @@ default_entry:
xorl %ebx,%ebx /* %ebx is kept at zero */
- movl $pa(pg0), %edi
- movl %edi, pa(init_pg_tables_start)
+ movl $pa(__brk_base), %edi
movl $pa(swapper_pg_pmd), %edx
movl $PTE_IDENT_ATTR, %eax
10:
@@ -216,7 +215,8 @@ default_entry:
cmpl %ebp,%eax
jb 10b
1:
- movl %edi,pa(init_pg_tables_end)
+ addl $__PAGE_OFFSET, %edi
+ movl %edi, pa(_brk_end)
shrl $12, %eax
movl %eax, pa(max_pfn_mapped)
@@ -227,8 +227,7 @@ default_entry:
page_pde_offset = (__PAGE_OFFSET >> 20);
- movl $pa(pg0), %edi
- movl %edi, pa(init_pg_tables_start)
+ movl $pa(__brk_base), %edi
movl $pa(swapper_pg_dir), %edx
movl $PTE_IDENT_ATTR, %eax
10:
@@ -249,7 +248,8 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
leal (INIT_MAP_BEYOND_END+PTE_IDENT_ATTR)(%edi),%ebp
cmpl %ebp,%eax
jb 10b
- movl %edi,pa(init_pg_tables_end)
+ addl $__PAGE_OFFSET, %edi
+ movl %edi, pa(_brk_end)
shrl $12, %eax
movl %eax, pa(max_pfn_mapped)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b8329029c150..3ac2aa7b9eaf 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -161,12 +161,6 @@ static struct resource bss_resource = {
#ifdef CONFIG_X86_32
-/* This value is set up by the early boot code to point to the value
- immediately after the boot time page tables. It contains a *physical*
- address, and must not be in the .bss segment! */
-unsigned long init_pg_tables_start __initdata = ~0UL;
-unsigned long init_pg_tables_end __initdata = ~0UL;
-
static struct resource video_ram_resource = {
.name = "Video RAM area",
.start = 0xa0000,
diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S
index 27e44aa21585..1063fbe93c73 100644
--- a/arch/x86/kernel/vmlinux_32.lds.S
+++ b/arch/x86/kernel/vmlinux_32.lds.S
@@ -196,10 +196,6 @@ SECTIONS
__brk_limit = . ;
_end = . ;
-
- /* This is where the kernel creates the early boot page tables */
- . = ALIGN(PAGE_SIZE);
- pg0 = . ;
}
/* Sections to be discarded */
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 9fe4ddaa8f6f..90e44a10e68a 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -1058,14 +1058,6 @@ __init void lguest_init(void)
* lguest_init() where the rest of the fairly chaotic boot setup
* occurs. */
- /* The native boot code sets up initial page tables immediately after
- * the kernel itself, and sets init_pg_tables_end so they're not
- * clobbered. The Launcher places our initial pagetables somewhere at
- * the top of our physical memory, so we don't need extra space: set
- * init_pg_tables_end to the end of the kernel. */
- init_pg_tables_start = __pa(pg0);
- init_pg_tables_end = __pa(pg0);
-
/* As described in head_32.S, we map the first 128M of memory. */
max_pfn_mapped = (128*1024*1024) >> PAGE_SHIFT;

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