From 130ef7a34df14a57097a273867bc2bb5816d5f49 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 30 Apr 2024 20:41:44 -0400
Subject: kernel/amd64: machdep: Add cpu_halt_others()

Halts all other processors except self

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/machdep.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'sys/arch')

diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c
index 809eb27..f73d773 100644
--- a/sys/arch/amd64/amd64/machdep.c
+++ b/sys/arch/amd64/amd64/machdep.c
@@ -43,6 +43,7 @@
 #include <machine/cpu.h>
 #include <machine/uart.h>
 #include <machine/cpuid.h>
+#include <machine/sysvec.h>
 #include <dev/pci/pci.h>
 #include <vm/vm.h>
 #include <vm/dynalloc.h>
@@ -62,6 +63,13 @@ __KERNEL_META("$Hyra$: machdep.c, Ian Marco Moffett, "
 
 void syscall_isr(void);
 
+__attr(interrupt)
+static void
+halt_isr(void *sf)
+{
+    processor_halt();
+}
+
 static inline void
 init_tss(struct cpu_info *cur_cpu)
 {
@@ -88,6 +96,7 @@ interrupts_init(void)
     idt_set_desc(0xD, IDT_TRAP_GATE_FLAGS, ISR(general_prot), 0);
     idt_set_desc(0xE, IDT_TRAP_GATE_FLAGS, ISR(page_fault), 0);
     idt_set_desc(0x80, IDT_INT_GATE_USER, ISR(syscall_isr), 0);
+    idt_set_desc(SYSVEC_HLT, IDT_INT_GATE_FLAGS, ISR(halt_isr), 0);
     idt_load();
 }
 
@@ -209,6 +218,12 @@ backtrace(void)
     }
 }
 
+void
+cpu_halt_others(void)
+{
+    lapic_send_ipi(0, IPI_SHORTHAND_OTHERS, SYSVEC_HLT);
+}
+
 int
 processor_init_pcb(struct proc *proc)
 {
-- 
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