From cf1bb5e566ad0e346af810b399d871a74031feb2 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Fri, 25 Jul 2025 02:44:11 -0400 Subject: 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 --- sys/include/arch/amd64/cpu.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'sys/include/arch/amd64/cpu.h') 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 #include #include +#include #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_ */ -- cgit v1.2.3