summaryrefslogtreecommitdiff
path: root/arch/x86/kernel/head_32.S
diff options
context:
space:
mode:
authorRusty Russell <rusty@rustcorp.com.au>2011-01-04 17:20:54 +1030
committerIngo Molnar <mingo@elte.hu>2011-01-04 09:53:50 +0100
commitd50d8fe192428090790e7178e9507e981e0b005b (patch)
tree989ba73e524b8fbd627d36793ef6cee6ffa8a51d /arch/x86/kernel/head_32.S
parent387c31c7e5c9805b0aef8833d1731a5fe7bdea14 (diff)
x86, mm: Initialize initial_page_table before paravirt jumps
v2.6.36-rc8-54-gb40827f (x86-32, mm: Add an initial page table for core bootstrapping) made x86 boot using initial_page_table and broke lguest. For 2.6.37 we simply cut & paste the initialization code into lguest (da32dac10126 "lguest: populate initial_page_table"), now we fix it properly by doing that initialization before the paravirt jump. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Cc: lguest <lguest@ozlabs.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <201101041720.54535.rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/head_32.S')
-rw-r--r--arch/x86/kernel/head_32.S77
1 files changed, 39 insertions, 38 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index c0dbd9ac24f0..e3a8bb91e168 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -139,39 +139,6 @@ ENTRY(startup_32)
movl %eax, pa(olpc_ofw_pgd)
#endif
-#ifdef CONFIG_PARAVIRT
- /* This is can only trip for a broken bootloader... */
- cmpw $0x207, pa(boot_params + BP_version)
- jb default_entry
-
- /* Paravirt-compatible boot parameters. Look to see what architecture
- we're booting under. */
- movl pa(boot_params + BP_hardware_subarch), %eax
- cmpl $num_subarch_entries, %eax
- jae bad_subarch
-
- movl pa(subarch_entries)(,%eax,4), %eax
- subl $__PAGE_OFFSET, %eax
- jmp *%eax
-
-bad_subarch:
-WEAK(lguest_entry)
-WEAK(xen_entry)
- /* Unknown implementation; there's really
- nothing we can do at this point. */
- ud2a
-
- __INITDATA
-
-subarch_entries:
- .long default_entry /* normal x86/PC */
- .long lguest_entry /* lguest hypervisor */
- .long xen_entry /* Xen hypervisor */
- .long default_entry /* Moorestown MID */
-num_subarch_entries = (. - subarch_entries) / 4
-.previous
-#endif /* CONFIG_PARAVIRT */
-
/*
* Initialize page tables. This creates a PDE and a set of page
* tables, which are located immediately beyond __brk_base. The variable
@@ -181,7 +148,6 @@ num_subarch_entries = (. - subarch_entries) / 4
*
* Note that the stack is not yet set up!
*/
-default_entry:
#ifdef CONFIG_X86_PAE
/*
@@ -261,7 +227,42 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
movl $pa(initial_pg_fixmap)+PDE_IDENT_ATTR,%eax
movl %eax,pa(initial_page_table+0xffc)
#endif
- jmp 3f
+
+#ifdef CONFIG_PARAVIRT
+ /* This is can only trip for a broken bootloader... */
+ cmpw $0x207, pa(boot_params + BP_version)
+ jb default_entry
+
+ /* Paravirt-compatible boot parameters. Look to see what architecture
+ we're booting under. */
+ movl pa(boot_params + BP_hardware_subarch), %eax
+ cmpl $num_subarch_entries, %eax
+ jae bad_subarch
+
+ movl pa(subarch_entries)(,%eax,4), %eax
+ subl $__PAGE_OFFSET, %eax
+ jmp *%eax
+
+bad_subarch:
+WEAK(lguest_entry)
+WEAK(xen_entry)
+ /* Unknown implementation; there's really
+ nothing we can do at this point. */
+ ud2a
+
+ __INITDATA
+
+subarch_entries:
+ .long default_entry /* normal x86/PC */
+ .long lguest_entry /* lguest hypervisor */
+ .long xen_entry /* Xen hypervisor */
+ .long default_entry /* Moorestown MID */
+num_subarch_entries = (. - subarch_entries) / 4
+.previous
+#else
+ jmp default_entry
+#endif /* CONFIG_PARAVIRT */
+
/*
* Non-boot CPU entry point; entered from trampoline.S
* We can't lgdt here, because lgdt itself uses a data segment, but
@@ -282,7 +283,7 @@ ENTRY(startup_32_smp)
movl %eax,%fs
movl %eax,%gs
#endif /* CONFIG_SMP */
-3:
+default_entry:
/*
* New page tables may be in 4Mbyte page mode and may
@@ -622,13 +623,13 @@ ENTRY(initial_code)
__PAGE_ALIGNED_BSS
.align PAGE_SIZE_asm
#ifdef CONFIG_X86_PAE
-ENTRY(initial_pg_pmd)
+initial_pg_pmd:
.fill 1024*KPMDS,4,0
#else
ENTRY(initial_page_table)
.fill 1024,4,0
#endif
-ENTRY(initial_pg_fixmap)
+initial_pg_fixmap:
.fill 1024,4,0
ENTRY(empty_zero_page)
.fill 4096,1,0