diff options
| -rw-r--r-- | i386/i386/cpu_number.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/i386/i386/cpu_number.h b/i386/i386/cpu_number.h index 67c19e9b..547e0498 100644 --- a/i386/i386/cpu_number.h +++ b/i386/i386/cpu_number.h @@ -41,12 +41,14 @@ #define CX(addr, reg) addr(,reg,8) #endif +/* Slow version, always works */ #define CPU_NUMBER_NO_STACK(reg) \ movl %cs:lapic, reg ;\ movl %cs:APIC_ID(reg), reg ;\ shrl $24, reg ;\ movl %cs:CX(cpu_id_lut, reg), reg ;\ +/* Fast version, requires a stack */ #ifdef __i386__ /* Never call CPU_NUMBER_NO_GS(%esi) */ #define CPU_NUMBER_NO_GS(reg) \ @@ -86,6 +88,7 @@ popq %rsi #endif +/* Fastest version, requires gs being set up */ #define CPU_NUMBER(reg) \ movl MY(CPU_ID), reg; |