diff options
Diffstat (limited to 'src/arch/i386/smp/secondary.S')
| -rw-r--r-- | src/arch/i386/smp/secondary.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/arch/i386/smp/secondary.S b/src/arch/i386/smp/secondary.S new file mode 100644 index 0000000000..78c55764b0 --- /dev/null +++ b/src/arch/i386/smp/secondary.S @@ -0,0 +1,76 @@ +#include <arch/asm.h> +#include <arch/intel.h> +#include <cpu/p6/mtrr.h> +#include <cpu/p6/apic.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 + + /* Enable the local apic, and map it where we expext it */ + movl $APIC_BASE_MSR, %ecx + rdmsr + orl $APIC_BASE_MSR_ENABLE, %eax + andl $(~APIC_BASE_MSR_ADDR_MASK), %eax + orl $APIC_DEFAULT_BASE, %eax + wrmsr + + /* Get the apic_id */ + movl (APIC_ID + APIC_DEFAULT_BASE), %edi + shrl $24, %edi + + /* Get the cpu index (MAX_CPUS on error) */ + movl $-4, %ebx +1: addl $4, %ebx + cmpl $(MAX_CPUS << 2), %ebx + je 2 + cmpl %edi, initial_apicid(%ebx) + jne 1b +2: shrl $2, %ebx + + /* set the stack pointer */ + movl $_estack, %esp + movl %ebx, %eax + movl $STACK_SIZE, %ebx + mull %ebx + subl %eax, %esp + + call secondary_cpu_init +1: hlt + jmp 1b + +gdtaddr: + .word gdt_limit /* the table limit */ + .long gdt /* we know the offset */ + + +.code32 |