From ef1166f6e83d72df360a6dfc2f6643d826ce07ba Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Mon, 12 Apr 2021 15:10:16 +0000
Subject: panic() and halt() now in kernel private interface

---
 kernel/Makefile    |  3 ++-
 kernel/entry_efi.c | 12 ++----------
 kernel/panic.c     | 21 +++++++++++++++++++++
 kernel/panic.h     | 12 ++++++++++++
 4 files changed, 37 insertions(+), 11 deletions(-)
 create mode 100644 kernel/panic.c
 create mode 100644 kernel/panic.h

diff --git a/kernel/Makefile b/kernel/Makefile
index da4591d..7caf69c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -19,7 +19,8 @@ LOADLIBES := -lgcc
 
 SOBJS := 
 GOBJS := entry_efi.o kprint.o serial.o port.o main.o memory.o \
-	 memset.o memcpy.o memmove.o memcmp.o cpu.o exceptions.o 
+	 memset.o memcpy.o memmove.o memcmp.o cpu.o exceptions.o \
+	 panic.o
 IOBJS :=
 
 $(SOBJS): CFLAGS += -fPIC
diff --git a/kernel/entry_efi.c b/kernel/entry_efi.c
index 7d8e058..f4eeb9c 100644
--- a/kernel/entry_efi.c
+++ b/kernel/entry_efi.c
@@ -10,8 +10,7 @@
 #include "serial.h"
 #include "kprint.h"
 #include "memory.h"
-
-static noreturn void hang(void);
+#include "panic.h"
 
 static void efi_memory_init(struct efi_memory_map_data *map)
 {
@@ -65,12 +64,5 @@ noreturn void kernel_entry(struct efi_boot_data *data)
     serial_init();
     kputs("<hacker voice> i'm in\r\n");
     efi_memory_init(data->memory_map);
-    hang();
+    halt();
 }
-
-static noreturn void hang(void)
-{
-    __asm__ ("cli\n\t");
-    while (true) __asm__ ("hlt\n\t");
-}
-
diff --git a/kernel/panic.c b/kernel/panic.c
new file mode 100644
index 0000000..7a3a729
--- /dev/null
+++ b/kernel/panic.c
@@ -0,0 +1,21 @@
+#include "panic.h"
+
+static char const *reason_strings[] = {
+    "general panic",
+    "unhandled fault",
+};
+
+noreturn void panic(enum panic_reason reason)
+{
+    // TODO: kprintf() and friends
+    kputs("kernel panic: ")
+    kputs(reason_strings[reason]);
+    kputs("\n");
+    halt();
+}
+
+noreturn void halt(void)
+{
+    __asm__ ("cli\n\t");
+    while (true) __asm__ ("hlt\n\t");
+}
diff --git a/kernel/panic.h b/kernel/panic.h
new file mode 100644
index 0000000..8c6bda7
--- /dev/null
+++ b/kernel/panic.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdnoreturn.h>
+
+enum panic_reason
+{
+    GENERAL_PANIC,
+    UNHANDLED_FAULT,
+};
+
+noreturn void panic(enum panic_reason reason);
+noreturn void halt(void);
-- 
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