kernel: Add cpu_halt_others() and harden panic()

Ensure interrupts are disabled at the start of panic()
to prevent any interrupts from further degrading the
state of the system. Also adds a newline before "panic: "
to clean up the logs.

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 22 insertions, 0 deletions

diff --git a/sys/arch/aarch64/aarch64/machdep.c b/sys/arch/aarch64/aarch64/machdep.c
index a29ad7e..7c21e62 100644
--- a/sys/arch/aarch64/aarch64/machdep.c
+++ b/sys/arch/aarch64/aarch64/machdep.c
@@ -42,6 +42,13 @@ cpu_startup(struct cpu_info *ci)
 }
 
 void
+cpu_halt_others(void)
+{
+    /* TODO: STUB */
+    return;
+}
+
+void
 serial_init(void)
 {
     /* TODO: STUB */
diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c
index 07d6cdd..4a885fa 100644
--- a/sys/arch/amd64/amd64/machdep.c
+++ b/sys/arch/amd64/amd64/machdep.c
@@ -174,6 +174,21 @@ cpu_halt_all(void)
     for (;;);
 }
 
+/*
+ * Same as cpu_halt_all() but for all other
+ * cores but ourselves.
+ */
+void
+cpu_halt_others(void)
+{
+    if (rdmsr(IA32_GS_BASE) == 0) {
+        __ASMV("cli; hlt");
+    }
+
+    /* Send IPI to all cores */
+    lapic_send_ipi(0, IPI_SHORTHAND_OTHERS, halt_vector);
+}
+
 void
 serial_init(void)
 {