more info tags

1 files changed, 43 insertions, 2 deletions

diff --git a/src/kernel/vga.c b/src/kernel/vga.c
index 5fd8a46..cf95bc2 100644
--- a/src/kernel/vga.c
+++ b/src/kernel/vga.c
@@ -21,10 +21,11 @@ OF THIS SOFTWARE.
 #include "serial.h"
 #include <stdbool.h>
 
-uint16_t cursor_pos = 0;
-uint8_t color = 0x70;
+#define VGA_BUFFER ((uint8_t *)0x000b8000)
 #define cols 80
 #define rows 25
+uint16_t cursor_pos = 0;
+uint8_t color = 0x70;
 
 void clear(void) {
   uint32_t fill = 0x00200020 | (color << 24) | (color << 8);
@@ -82,6 +83,46 @@ void put_32_hex(uint32_t n) {
   }
 }
 
+void put_16_hex(uint16_t n) {
+  for (uint8_t i = 0; i < 4; ++i) {
+    put_char("0123456789abcdef"[n >> 12]);
+    n <<= 4;
+  }
+}
+
+void put_8_hex(uint8_t n) {
+  put_char("0123456789abcdef"[n >> 4]);
+  put_char("0123456789abcdef"[n & 0x0f]);
+}
+
+void put_32_dec(uint32_t n) {
+  if (n) {
+    bool sig = false;
+    for (uint32_t m = 1000000000; m; m /= 10) {
+      if (((n / m) % 10) || sig) {
+        sig = true;
+        put_char((uint8_t)'0' + (n / m) % 10);
+      }
+    }
+  }
+  else
+    put_char('0');
+}
+
+void put_8_dec(uint8_t n) {
+  if (n) {
+    bool sig = false;
+    for (uint8_t m = 100; m; m /= 10) {
+      if (((n / m) % 10) || sig) {
+        sig = true;
+        put_char((uint8_t)'0' + (n / m) % 10);
+      }
+    }
+  }
+  else
+    put_char('0');
+}
+
 void move_cursor(uint8_t col, uint8_t row) {
   cursor_pos = (col + row * cols) * 2;
 }