diff options
Diffstat (limited to 'arch/x86/kernel/head_32.S')
-rw-r--r-- | arch/x86/kernel/head_32.S | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 8e7f6556028f..c8932c79e78b 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S | |||
@@ -300,6 +300,12 @@ ENTRY(startup_32_smp) | |||
300 | leal -__PAGE_OFFSET(%ecx),%esp | 300 | leal -__PAGE_OFFSET(%ecx),%esp |
301 | 301 | ||
302 | default_entry: | 302 | default_entry: |
303 | #define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \ | ||
304 | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \ | ||
305 | X86_CR0_PG) | ||
306 | movl $(CR0_STATE & ~X86_CR0_PG),%eax | ||
307 | movl %eax,%cr0 | ||
308 | |||
303 | /* | 309 | /* |
304 | * New page tables may be in 4Mbyte page mode and may | 310 | * New page tables may be in 4Mbyte page mode and may |
305 | * be using the global pages. | 311 | * be using the global pages. |
@@ -364,8 +370,7 @@ default_entry: | |||
364 | */ | 370 | */ |
365 | movl $pa(initial_page_table), %eax | 371 | movl $pa(initial_page_table), %eax |
366 | movl %eax,%cr3 /* set the page table pointer.. */ | 372 | movl %eax,%cr3 /* set the page table pointer.. */ |
367 | movl %cr0,%eax | 373 | movl $CR0_STATE,%eax |
368 | orl $X86_CR0_PG,%eax | ||
369 | movl %eax,%cr0 /* ..and set paging (PG) bit */ | 374 | movl %eax,%cr0 /* ..and set paging (PG) bit */ |
370 | ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */ | 375 | ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */ |
371 | 1: | 376 | 1: |