From 9b2a78fa52249ab481493550490aa5f37872dcf6 Mon Sep 17 00:00:00 2001
From: aqua <aqua@iserlohn-fortress.net>
Date: Sat, 10 Dec 2022 20:56:57 +0200
Subject: Rewrite drivers/uart and drivers/vga in cpp

---
 devices/vga.c | 152 ----------------------------------------------------------
 1 file changed, 152 deletions(-)
 delete mode 100644 devices/vga.c

(limited to 'devices/vga.c')

diff --git a/devices/vga.c b/devices/vga.c
deleted file mode 100644
index 6d64c0a..0000000
--- a/devices/vga.c
+++ /dev/null
@@ -1,152 +0,0 @@
-#include "vga.h"
-#include <stdint.h>
-#include <sys/io.h>
-
-#define cga_idx_port 0x3d4
-#define cga_dat_port 0x3d5
-
-#define cursor_start 0x0a
-#define cursor_end 0x0b
-#define cursor_addr_h 0x0e
-#define cursor_addr_l 0x0f
-#define cursor_hide 0x20
-
-struct __attribute__((packed)) VGAEntry {
-  unsigned char text;
-  uint8_t foreground : 4;
-  uint8_t background : 4;
-};
-_Static_assert(sizeof(struct VGAEntry) == 2, "sizeof VGAEntry");
-
-const int width = 80;
-const int height = 25;
-
-struct VGAEntry *buffer;
-int col = 0;
-int row = 0;
-
-// *** Cursor ***
-void
-vga_enable_cursor(unsigned char start, unsigned char end)
-{
-  outb(cursor_start, cga_idx_port);
-  outb((inb(cga_dat_port) & 0xc0) | start, cga_dat_port);
-
-  outb(cursor_end, cga_idx_port);
-  outb((inb(cga_dat_port) & 0xe0) | end, cga_dat_port);
-}
-
-void
-vga_disable_cursor()
-{
-  outb(cursor_start, cga_idx_port);
-  outb(cursor_hide, cga_dat_port);
-}
-
-void
-vga_update_cursor()
-{
-  const uint16_t pos = row * width + col;
-
-  outb(cursor_addr_l, cga_idx_port);
-  outb(pos & 0xff, cga_dat_port);
-
-  outb(cursor_addr_h, cga_idx_port);
-  outb((pos >> 8) & 0xff, cga_dat_port);
-}
-
-// *** Text Mode Output ***
-void
-vga_putc(__attribute__((unused)) const FILE *self, char a)
-{
-  switch (a) {
-  case '\n':
-    col = 0;
-    ++row;
-    break;
-  case '\r':
-    col = 0;
-    break;
-  case '\b':
-    --col;
-    if (col < 0) col = 0;
-    break;
-  default:
-    buffer[row * width + col].text = a;
-    ++col;
-  }
-
-  if (col == width) {
-    col = 0;
-    ++row;
-  }
-
-  if (row == height) {
-    // scroll up
-    for (int y = 1; y < height; ++y)
-      for (int x = 0; x < width; ++x) {
-        const int prev = (y - 1) * width + x;
-        const int curr = y * width + x;
-        buffer[prev] = buffer[curr];
-      }
-    // blank out last row
-    for (int i = (height - 1) * width; i < height * width; ++i) buffer[i].text = ' ';
-    --row;
-  }
-}
-
-int
-vga_puts(const FILE *self, const char *string, int len)
-{
-  int written = 0;
-  if (len == -1)
-    while (*string != '\0') {
-      vga_putc(self, *string);
-      ++string;
-      ++written;
-    }
-
-  else
-    for (int i = 0; i < len; ++i) {
-      vga_putc(self, string[i]);
-      ++written;
-    }
-  return written;
-}
-
-void
-vga_flush(__attribute__((unused)) const FILE *self)
-{
-  vga_update_cursor();
-}
-
-// *** Text Mode ***
-FILE vga_stream;
-
-FILE *
-vga_init()
-{
-  buffer = (struct VGAEntry *)0xc03ff000;
-  vga_enable_cursor(14, 15);
-  vga_clear(VGA_COLOR_LIGHT_BLUE, VGA_COLOR_LIGHT_GREY);
-
-  vga_stream.id = 0;
-  vga_stream.putc = &vga_putc;
-  vga_stream.puts = &vga_puts;
-  vga_stream.flush = &vga_flush;
-  return &vga_stream;
-}
-
-void
-vga_clear(enum vga_color foreground, enum vga_color background)
-{
-  for (int y = 0; y < height; ++y)
-    for (int x = 0; x < width; ++x) {
-      const int index = y * width + x;
-      buffer[index].text = ' ';
-      buffer[index].foreground = foreground;
-      buffer[index].background = background;
-    }
-  col = row = 0;
-  vga_update_cursor();
-}
-- 
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