From 02f14113cbf14c6f842fb43ecbc68d0c851ef3b0 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji3.141@gmail.com>
Date: Sun, 24 May 2020 11:02:43 -0400
Subject: very basic vga, ata, serial drivers. start of fat and fs drivers

---
 src/kernel/vga.c | 58 +++++++++++++++++++-------------------------------------
 1 file changed, 19 insertions(+), 39 deletions(-)

(limited to 'src/kernel/vga.c')

diff --git a/src/kernel/vga.c b/src/kernel/vga.c
index 8e438a8..c387b22 100644
--- a/src/kernel/vga.c
+++ b/src/kernel/vga.c
@@ -1,6 +1,12 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#define VGA_COM_MIRROR
+
+#ifdef VGA_COM_MIRROR
+#include "serial.h"
+#endif
+
 #define VGA_COLUMNS 80
 #define VGA_LINES 25
 #define VGA_START (uint16_t *)0x000b8000
@@ -8,11 +14,18 @@
 uint16_t *cursor = VGA_START;
 uint16_t color = 0x1f00;
 
+void vga_set_color(uint8_t new_color) {
+  color = new_color << 8;
+}
+
 void vga_scroll() {
   cursor = VGA_START;
 }
 
 void vga_blank() {
+#ifdef VGA_COM_MIRROR
+  soutsz("\r\n\r\n<CLEAR>\r\n\r\n");
+#endif
   uint32_t f = (color << 16) | color | 0x00200020;
   uint32_t *p = (uint32_t *)VGA_START;
   while (p < (uint32_t *)VGA_END)
@@ -22,10 +35,16 @@ void vga_blank() {
 
 void vga_printch(uint8_t ch) {
   if (ch == '\n') {
+#ifdef VGA_COM_MIRROR
+    soutsz("\r\n");
+#endif
     if ((cursor = cursor - (cursor - VGA_START) % VGA_COLUMNS + VGA_COLUMNS) == VGA_END)
       vga_scroll();
     return;
   }
+#ifdef VGA_COM_MIRROR
+  sout(ch);
+#endif
   *(cursor++) = color | ch;
   if (cursor == VGA_END)
     vga_scroll();
@@ -39,43 +58,4 @@ void vga_printsz(uint8_t *sz) {
 void vga_printsn(uint8_t *sn, uint8_t n) {
   while (n--)
     vga_printch(*(sn++));
-}
-
-void vga_printu32(uint32_t n) {
-  bool zero = false;
-  for (uint32_t m = 1000000000; m; m /= 10) {
-    uint8_t d = (n / m) % 10;
-    if (zero)
-      vga_printch(d + '0');
-    else if (d) {
-      zero = true;
-      vga_printch(d + '0');
-    }
-  }
-}
-
-void vga_printu16(uint16_t n) {
-  bool zero = false;
-  for (uint16_t m = 10000; m; m /= 10) {
-    uint8_t d = (n / m) % 10;
-    if (zero)
-      vga_printch(d + '0');
-    else if (d) {
-      zero = true;
-      vga_printch(d + '0');
-    }
-  }
-}
-
-void vga_printu8(uint8_t n) {
-  bool zero = false;
-  for (uint8_t m = 100; m; m /= 10) {
-    uint8_t d = (n / m) % 10;
-    if (zero)
-      vga_printch(d + '0');
-    else if (d) {
-      zero = true;
-      vga_printch(d + '0');
-    }
-  }
 }
\ No newline at end of file
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