| /* Save BIST result */ |
| |
| movl %eax, %ebp |
| |
| /* check if SPAD0 is cleared. If yes, it means this was a hard reset */ |
| movl $0x800080d0, %eax |
| movw $0xcf8, %dx |
| outl %eax, %dx |
| |
| addw $4, %dx |
| inl %dx, %eax |
| cmp $0, %eax |
| je no_reset |
| |
| /* perform hard reset */ |
| movw $0xcf9, %dx |
| movb $0x06, %al |
| outb %al, %dx |
| |
| loop0: hlt |
| jmp loop0 |
| |
| no_reset: |
| |
| /* 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: /* set magic value for soft reset detection */ |
| movl $0x800080d0, %eax |
| movw $0xcf8, %dx |
| outl %eax, %dx |
| |
| addw $4, %dx |
| movl $0x12345678, %eax |
| outl %eax, %dx |
| |
| /* Restore BIST */ |
| mov %ebp, %eax |
