diff options
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/i5000/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/northbridge/intel/i5000/halt_second_bsp.S | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/src/northbridge/intel/i5000/Makefile.inc b/src/northbridge/intel/i5000/Makefile.inc index a5623c02bd..5e75159fca 100644 --- a/src/northbridge/intel/i5000/Makefile.inc +++ b/src/northbridge/intel/i5000/Makefile.inc @@ -19,3 +19,4 @@ driver-y += northbridge.c romstage-y += raminit.c udelay.c +cpu_incs += src/northbridge/intel/i5000/halt_second_bsp.S diff --git a/src/northbridge/intel/i5000/halt_second_bsp.S b/src/northbridge/intel/i5000/halt_second_bsp.S new file mode 100644 index 0000000000..a1a1b156db --- /dev/null +++ b/src/northbridge/intel/i5000/halt_second_bsp.S @@ -0,0 +1,29 @@ + /* Save BIST result */ + + movl %eax, %ebp + + /* Read the semaphore register of i5000 (BOFL0). + If it returns zero, it means there was already + another read by another CPU */ + + movl $0x800080c0, %eax + movw $0xcf8, %dx + outl %eax, %dx + + addw $4, %dx + inl %dx, %eax + cmp $0, %eax + jne 1f + + /* degrade BSP to AP */ + mov $0x1b, %ecx + rdmsr + andl $(~0x100), %eax + wrmsr + + cli +loop: hlt + jmp loop + +1: /* Restore BIST */ + mov %ebp, %eax |