diff options
Diffstat (limited to 'src/cpu/x86/lapic/secondary.S')
| -rw-r--r-- | src/cpu/x86/lapic/secondary.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/cpu/x86/lapic/secondary.S b/src/cpu/x86/lapic/secondary.S new file mode 100644 index 0000000000..786c31e532 --- /dev/null +++ b/src/cpu/x86/lapic/secondary.S @@ -0,0 +1,53 @@ +#include <arch/asm.h> +#include <arch/intel.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/lapic_def.h> + .text + .globl _secondary_start + .balign 4096 +_secondary_start: + .code16 + cli + xorl %eax, %eax + movl %eax, %cr3 /* Invalidate TLB*/ + + /* On hyper threaded cpus, invalidating the cache here is + * very very bad. Don't. + */ + + /* setup the data segment */ + movw %cs, %ax + movw %ax, %ds + + data32 lgdt gdtaddr - _secondary_start + + movl %cr0, %eax + andl $0x7FFAFFD1, %eax /* PG,AM,WP,NE,TS,EM,MP = 0 */ + orl $0x60000001, %eax /* CD, NW, PE = 1 */ + movl %eax, %cr0 + + ljmpl $0x10, $1f +1: + .code32 + movw $0x18, %ax + movw %ax, %ds + movw %ax, %es + movw %ax, %ss + movw %ax, %fs + movw %ax, %gs + + /* Set the stack pointer, and flag that we are done */ + xorl %eax, %eax + movl secondary_stack, %esp + movl %eax, secondary_stack + + call secondary_cpu_init +1: hlt + jmp 1b + +gdtaddr: + .word gdt_limit /* the table limit */ + .long gdt /* we know the offset */ + + +.code32 |