diff options
| author | Ian Moffett <ian@osmora.org> | 2025-07-25 02:44:11 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-07-25 02:44:45 -0400 |
| commit | cf1bb5e566ad0e346af810b399d871a74031feb2 (patch) | |
| tree | 7180f312516bb35327414366a24bc711b7b1740b /sys/include | |
| parent | 4d68494efd7b03a0c91215dc28afcf314940e2ea (diff) | |
kernel/amd64: Keep track of which cores are online
Give each core a bit that indicates whether the core is online or
halted. We also provide a cpu_halt() which marks the core as offline.
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/include')
| -rw-r--r-- | sys/include/arch/amd64/cdefs.h | 3 | ||||
| -rw-r--r-- | sys/include/arch/amd64/cpu.h | 16 |
2 files changed, 18 insertions, 1 deletions
diff --git a/sys/include/arch/amd64/cdefs.h b/sys/include/arch/amd64/cdefs.h index a49736b..d038a15 100644 --- a/sys/include/arch/amd64/cdefs.h +++ b/sys/include/arch/amd64/cdefs.h @@ -31,6 +31,7 @@ #define _AMD64_CDEFS_H_ #include <sys/cdefs.h> +#include <machine/cpu.h> /* * Please use CLI wisely, it is a good idea to use @@ -40,7 +41,7 @@ #define md_pause() __ASMV("rep; nop") /* (F3 90) PAUSE */ #define md_intoff() __ASMV("cli") /* Clear interrupts */ #define md_inton() __ASMV("sti") /* Enable interrupts */ -#define md_hlt() __ASMV("hlt") /* Halt the processor */ +#define md_hlt() cpu_halt() /* Halt the processor */ /* * AMD64 specific defines diff --git a/sys/include/arch/amd64/cpu.h b/sys/include/arch/amd64/cpu.h index 046b621..116661b 100644 --- a/sys/include/arch/amd64/cpu.h +++ b/sys/include/arch/amd64/cpu.h @@ -36,6 +36,7 @@ #include <sys/sched.h> #include <sys/spinlock.h> #include <machine/tss.h> +#include <machine/cdefs.h> #define CPU_IRQ(IRQ_N) (BIT((IRQ_N)) & 0xFF) @@ -51,6 +52,7 @@ struct cpu_info { uint8_t family : 4; /* CPU family ID */ uint8_t has_x2apic : 1; uint8_t tlb_shootdown : 1; + uint8_t online : 1; /* CPU online */ uint8_t ipl; size_t lapic_tmr_freq; uint8_t irq_mask; @@ -80,4 +82,18 @@ void mp_bootstrap_aps(struct cpu_info *ci); extern struct cpu_info g_bsp_ci; +__always_inline static inline void +cpu_halt(void) +{ + struct cpu_info *ci = this_cpu(); + + if (ci != NULL) + ci->online = 0; + + __ASMV("hlt"); + + if (ci != NULL) + ci->online = 1; +} + #endif /* !_MACHINE_CPU_H_ */ |