very basic vga, ata, serial drivers. start of fat and fs drivers

1 files changed, 31 insertions, 0 deletions

diff --git a/src/kernel/panic.c b/src/kernel/panic.c
new file mode 100644
index 0000000..49d4a27
--- /dev/null
+++ b/src/kernel/panic.c
@@ -0,0 +1,31 @@
+#include <stdint.h>
+#include "vga.h"
+#include "serial.h"
+#include "util.h"
+
+void halt() {
+  while (1)
+    asm volatile ("hlt");
+}
+
+void panic(uint8_t *message) {
+  uint32_t frame;
+  asm (
+    "movl %%ebp, %0"
+  : "=r" (frame));
+  vga_set_color(0x4f);
+  vga_blank();
+  vga_printsz("Kernel panic: ");
+  vga_printsz(message);
+  vga_printsz("\n\nStack trace:");
+  uint8_t stb[6];
+  while (1) {
+    uint32_t ip = *(uint32_t *)(0x38000 + frame + 4);
+    if (!ip)
+      halt();
+    vga_printsz("\n  0x");
+    u16_hex(ip - 0x30000 - 5, stb);//assumes would return to just after a call instruction
+    vga_printsz(stb);
+    frame = *(uint32_t *)(0x38000 + frame);
+  }
+}
\ No newline at end of file