diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2012-07-04 12:02:58 +0300 |
|---|---|---|
| committer | Anton Kochkov <anton.kochkov@gmail.com> | 2012-08-03 12:19:31 +0200 |
| commit | df0fbc7455bb7e7a6081c539c9c94d68168e72d6 (patch) | |
| tree | c067889f5f0281beed1cc6a36d361d4f057d5c57 /src/cpu/intel/car | |
| parent | 15cf0adc3edaf184d98a3b3c228e0858ff7b24d3 (diff) | |
Intel CPUs: Fix counting of CPU cores
Detection for a hyper-threading CPU was not compatible with multicore
CPUs. When using CPUID eax==4, also need to set ecx=0.
CAR init tested on real hardware with hyper-threading model_f25 and
under qemu 0.15.1 with multicore CPU.
Change-Id: I28ac8790f94652e4ba8ff88fe7812c812f967608
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1172
Tested-by: build bot (Jenkins)
Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
Diffstat (limited to 'src/cpu/intel/car')
| -rw-r--r-- | src/cpu/intel/car/cache_as_ram_ht.inc | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/src/cpu/intel/car/cache_as_ram_ht.inc b/src/cpu/intel/car/cache_as_ram_ht.inc index 65da51631b..2a8d854a10 100644 --- a/src/cpu/intel/car/cache_as_ram_ht.inc +++ b/src/cpu/intel/car/cache_as_ram_ht.inc @@ -127,16 +127,36 @@ bsp_init: post_code(0x24) - /* For a hyper-threading processor, cache must not be disabled - * on an AP on the same physical package with the BSP. - */ - movl $01, %eax + movl $1, %eax cpuid btl $28, %edx jnc sipi_complete bswapl %ebx - cmpb $01, %bh - jbe sipi_complete + movzx %bh, %edi + cmpb $1, %bh + jbe sipi_complete /* only one LAPIC ID in package */ + + movl $0, %eax + cpuid + movb $1, %bl + cmpl $4, %eax + jb cores_counted + movl $4, %eax + movl $0, %ecx + cpuid + shr $26, %eax + movb %al, %bl + inc %bl + +cores_counted: + movl %edi, %eax + divb %bl + cmpb $1, %al + jbe sipi_complete /* only LAPIC ID of a core */ + + /* For a hyper-threading processor, cache must not be disabled + * on an AP on the same physical package with the BSP. + */ hyper_threading_cpu: @@ -202,7 +222,7 @@ ap_init: ap_halt: cli 1: hlt - jnz 1b + jmp 1b |