add: kpanic

headers/debug.h

@@ -6,3 +6,5 @@ struct stackframe {
 	struct stackframe *ebp;
 	uint32_t eip;
 };
+
+void print_stack(void);

headers/kpanic.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void kpanic(const char *format, ...);

headers/power.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void reboot(void);
+void halt(void);

headers/shell.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include "debug.h"
+#include "power.h"
+
 #define PROMPT "> "
 
 [[__maybe_unused__]] static const char *POOP =
@@ -44,8 +47,5 @@
     "\n";
 
 void shell_init(void);
-void reboot(void);
-void halt(void);
-void print_stack(void);
 void date(void);
 void merdella(void);

headers/terminal.h

@@ -41,7 +41,8 @@ typedef enum {
 enum cursor_direction { LEFT, RIGHT, UP, DOWN };
 
 void terminal_initialize(void);
-void terminal_setcolor(uint8_t color);
+void terminal_set_bg_color(uint8_t color);
+void terminal_set_fg_color(uint8_t color);
 int terminal_putchar(char c);
 int terminal_write(const char *data, size_t size);
 int terminal_writestring(const char *data);

src/debug/print_stack.c

@@ -7,7 +7,7 @@ void print_stack(void)
 	    (struct stackframe *)__builtin_frame_address(0);
 
 	while (stack) {
-		kprintf(KERN_DEBUG "fn: %d\n", stack->eip);
+		kprintf(KERN_DEBUG "fn: %p\n", stack->eip);
 		stack = stack->ebp;
 	}
 }

src/kernel.c

@@ -32,10 +32,5 @@ void kernel_main(void)
 	kprintf(KERN_NOTICE "KERN_NOTICE\n");
 	kprintf(KERN_INFO "KERN_INFO\n");
 	kprintf(KERN_DEBUG "KERN_DEBUG\n");
-	char *str = kalloc(10);
-	kfree(str);
-	str = kalloc(10);
-	strcpy(str, "Hello world\n");
-	kprintf("%s", str);
 	shell_init();
 }

src/kpanic.c

@@ -0,0 +1,23 @@
+#include "debug.h"
+#include "keyboard.h"
+#include "kprintf.h"
+#include "power.h"
+#include "terminal.h"
+
+void kpanic(const char *format, ...)
+{
+	va_list va;
+
+	terminal_set_bg_color(VGA_COLOR_BLUE);
+	terminal_clear();
+	va_start(va, format);
+	kvprintf(format, va);
+	va_end(va);
+	kprintf("\n\n");
+	print_stack();
+	kprintf("\n\n");
+	kprintf("PRESS SPACE TO REBOOT");
+	while (terminal_getkey().scan_code != KEY_SPACE)
+		;
+	reboot();
+}

src/power/halt.c

@@ -0,0 +1,4 @@
+void halt(void)
+{
+	asm volatile("hlt");
+}

src/power/reboot.c

@@ -30,8 +30,3 @@ loop:
 	asm volatile("hlt");
 	goto loop;
 }
-
-void halt(void)
-{
-	asm volatile("hlt");
-}

src/terminal/put.c

@@ -49,9 +49,14 @@ void terminal_set_screen(int pos)
 		kprintf(PROMPT);
 }
 
-void terminal_setcolor(uint8_t color)
+void terminal_set_bg_color(uint8_t bg_color)
 {
-	screen->color = color;
+	screen->color = bg_color << 4 | (screen->color & 0x0F);
+}
+
+void terminal_set_fg_color(uint8_t fg_color)
+{
+	screen->color = (screen->color & 0xF0) | fg_color;
 }
 
 void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
@@ -81,7 +86,7 @@ void terminal_clear(void)
 	for (size_t y = 0; y < VGA_HEIGHT; y++) {
 		for (size_t x = 0; x < VGA_WIDTH; x++) {
 			const size_t index = y * VGA_WIDTH + x;
-			TERM_BUF[index] = vga_entry(' ', VGA_COLOR_WHITE);
+			TERM_BUF[index] = vga_entry(' ', screen->color);
 		}
 	}
 	memcpy(screen->buffer, TERM_BUF, sizeof(screen->buffer));
@@ -161,35 +166,11 @@ void move_cursor(int direction)
 
 void set_color_level(int level)
 {
-	switch (level) {
-	case 0:
-		screen->color = VGA_COLOR_WHITE;
-		break;
-	case 1:
-		screen->color = VGA_COLOR_RED;
-		break;
-	case 2:
-		screen->color = VGA_COLOR_RED;
-		break;
-	case 3:
-		screen->color = VGA_COLOR_MAGENTA;
-		break;
-	case 4:
-		screen->color = VGA_COLOR_LIGHT_YELLOW;
-		break;
-	case 5:
-		screen->color = VGA_COLOR_LIGHT_YELLOW;
-		break;
-	case 6:
-		screen->color = VGA_COLOR_LIGHT_BLUE;
-		break;
-	case 7:
-		screen->color = VGA_COLOR_GREEN;
-		break;
-	case 8:
-		screen->color = VGA_COLOR_LIGHT_GREY;
-		break;
-	default:
-		break;
-	}
+	int color_translation[] = {
+	    VGA_COLOR_WHITE,        VGA_COLOR_RED,
+	    VGA_COLOR_RED,          VGA_COLOR_MAGENTA,
+	    VGA_COLOR_LIGHT_YELLOW, VGA_COLOR_LIGHT_YELLOW,
+	    VGA_COLOR_LIGHT_BLUE,   VGA_COLOR_GREEN,
+	    VGA_COLOR_LIGHT_GREY};
+	terminal_set_fg_color(color_translation[level]);
 }