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FABRIC-3.10.8 MC-3b: waking a worker core

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Each worker core sets up its own IPI receiver before going online (amd64
LAPIC + vector 0x22 with its own stub, aarch64 banked GIC SGI 0, riscv64
sie.SSIE); core 0 sends by ICR / GICD_SGIR / SBI IPI. Park lets exactly
one interrupt in without a lost-wake window. Boot self-test: IPI round
trips 3/3 and 'woke x3, IPIs x3' on all three ISAs; worker vCPU threads
0.0% on the host. 3-ISA acceptance clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-09-26 16:31:01 -04:00
co-authored by Claude Opus 5.5
parent d7745b49be
commit 71e0be96b0
24 changed files with 46016 additions and 8 deletions
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src/starkernel/arch/amd64/smp.c
+14 -1
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@@ -102,9 +102,22 @@ uint32_t arch_smp_enumerate(BootInfo *boot_info, uint64_t *hw_ids, uint32_t cap)
uint64_t arch_smp_boot_hw_id(void) { return apic_id(); }
/* MC-3b: exactly one interrupt may end the halt -- `sti`'s one-instruction
* shadow covers the `hlt`, so a wake IPI can't slip in between and be lost. */
void arch_smp_park_once(void)
{
__asm__ volatile ("cli; hlt" ::: "memory");
__asm__ volatile ("sti; hlt; cli" ::: "memory");
}
void arch_smp_secondary_init(sk_percpu_t *pc)
{
apic_secondary_enable();
pc->ipi_target = pc->hw_id; /* the APIC id */
}
void arch_smp_send_ipi(const sk_percpu_t *target)
{
(void)apic_send_ipi((uint8_t)target->ipi_target, 0x00004000u | SK_IPI_VECTOR); /* fixed, assert */
}
const char *arch_smp_arrival(const sk_percpu_t *pc)