working on exposing vga to userspace

programs/vga_text_term/main.c

@@ -1,5 +1,8 @@
+#include "syscall.h"
 #include <unistd.h>
 
+#include <sys/video.h>
+
 #define VGA_TEXT_W 80
 #define VGA_TEXT_H 25
 
@@ -8,6 +11,16 @@ void term();
 int ptys;
 int ptym;
 
+fb_info_t fb_info;
+void* framebuffer_address;
+
+int terminal_col = 0;
+int terminal_row = 0;
+
+void term_write_char(char c) {
+
+}
+
 int main(int argc, char *argv[]) {
     (void)argc;
     (void)argv;
@@ -28,42 +41,20 @@ int main(int argc, char *argv[]) {
     dup2(0, 1);
     dup2(0, 2);
 
-    term();
-
-    return 0;
-}
-
-void clear(int fd) {
-    lseek(fd, 0, 0);
-    size_t bytes = VGA_TEXT_W * VGA_TEXT_H;
-    char c = ' ';
-    for (size_t i = 0; i < bytes; i++) {
-        write(fd, &c, 1);
-    }
-    lseek(fd, 0, 0);
-}
-
-void term() {
-    int vga_fd = open("/dev/tvga");
-    if (vga_fd == -1) return;
+    int vga_fd = open("/dev/vga");
+    if (vga_fd == -1) return 1;
 
     int kbd_fd = open("/dev/kbd");
-    if (kbd_fd == -1) return;
+    if (kbd_fd == -1) return 1;
 
-    clear(vga_fd);
-
-    char c;
-    while (1) {
-        // first, get shell output
-        int rd = read(0, &c, 1);
-        if (rd > 0) {
-            write(vga_fd, &c, 1);
-        }
-
-        // then read a byte from the kbd. If we got one, pass it to the shell
-        rd = read(kbd_fd, &c, 1);
-        if (rd > 0) {
-            write(1, &c, 1);
-        }
+    int res = ioctl(vga_fd, FBIOGET_INFO, &fb_info);
+    if (!res) {
+        return 1;
     }
+
+    framebuffer_address = mmap(vga_fd);
+
+
+
+    return 0;
 }