Sebastian Herbszt wrote:
The AP enters HALT state with IF=0. What can make it resume at the following "jmp 1b"? NMI? SMI?
Yes, but also INIT. We might ignore IF=0 for hlt (which would be a bug).
I think i read something about a need for 4kb alignment for the startup vector in the mp specs. AP_BOOT_ADDR is currently at 0x10000 (16 x 4kb).
Yes, the SIPI address is 4K x sipi vector.
- Sebastian --- rombios32start.S.orig Wed Aug 6 21:37:22 2008 +++ rombios32start.S Wed Aug 6 21:39:17 2008 @@ -40,6 +40,7 @@ _start: .code16 smp_ap_boot_code_start: + cli xor %ax, %ax mov %ax, %ds xor %eax, %eax @@ -60,6 +61,7 @@ smp_ap_boot_code_start: 12: incw CPU_COUNT_ADDR + ljmp $0xe000, $(1f-_start) 1: hlt jmp 1b
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