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 +++++++++++++++
 sys/include/arch/amd64/sysvec.h |  1 +
 sys/include/sys/machdep.h       |  1 +
 3 files changed, 17 insertions(+)

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)
 {
diff --git a/sys/include/arch/amd64/sysvec.h b/sys/include/arch/amd64/sysvec.h
index 81383ea..8feecb7 100644
--- a/sys/include/arch/amd64/sysvec.h
+++ b/sys/include/arch/amd64/sysvec.h
@@ -41,6 +41,7 @@
 typedef enum {
     SYSVEC_LAPIC_TIMER = 0x21,     /* Local APIC timer */
     SYSVEC_IPI,                    /* IPI vector */
+    SYSVEC_HLT,                    /* Halt vector */
 
     /* -- XXX: New vectors go above -- */
     NSYSVEC_BASE,                  /* Non-system vector base */
diff --git a/sys/include/sys/machdep.h b/sys/include/sys/machdep.h
index 811f6be..99ebbac 100644
--- a/sys/include/sys/machdep.h
+++ b/sys/include/sys/machdep.h
@@ -49,6 +49,7 @@ __weak void chips_init(void);
 __weak void pre_init(void);
 __weak void serial_dbgch(char c);
 __weak void backtrace(void);
+__weak void cpu_halt_others(void);
 
 #endif  /* defined(_KERNEL) */
 #endif  /* !_SYS_MACHDEP_H_ */
-- 
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