kernel: dev: Add /dev/console

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 51 insertions, 1 deletions

diff --git a/sys/dev/cons/cons.c b/sys/dev/cons/cons.c
index c3a3197..0de5590 100644
--- a/sys/dev/cons/cons.c
+++ b/sys/dev/cons/cons.c
@@ -30,13 +30,16 @@
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/ascii.h>
+#include <sys/device.h>
 #include <dev/video/fbdev.h>
 #include <dev/cons/font.h>
 #include <dev/cons/cons.h>
+#include <fs/devfs.h>
 #include <vm/dynalloc.h>
 #include <string.h>
 
 struct cons_screen g_root_scr = {0};
+static struct cdevsw cons_cdevsw;
 
 /*
  * Create a chracter descriptor for drawing
@@ -89,7 +92,7 @@ static void
 cons_draw_cursor(struct cons_screen *scr, uint32_t color)
 {
     size_t idx;
-    
+
     for (uint32_t cy = 0; cy < FONT_HEIGHT; ++cy) {
         for (uint32_t cx = 0; cx < FONT_WIDTH; ++cx) {
             idx = fbdev_get_index(&scr->fbdev, (scr->curs_col * FONT_WIDTH) + cx, (scr->curs_row * FONT_HEIGHT) + cy);
@@ -141,6 +144,20 @@ cons_handle_special(struct cons_screen *scr, char c)
     return -1;
 }
 
+/*
+ * Character device function.
+ */
+static int
+dev_write(dev_t dev, struct sio_txn *sio, int flags)
+{
+    char *p = sio->buf;
+
+    for (size_t i = 0; i < sio->len; ++i) {
+        cons_putch(&g_root_scr, p[i]);
+    }
+
+    return sio->len;
+}
 
 /*
  * Put a character on the screen.
@@ -204,3 +221,32 @@ cons_init(void)
     g_root_scr.ncols = fbdev.width / FONT_WIDTH;
     g_root_scr.fbdev = fbdev;
 }
+
+/*
+ * Expose the console to /dev/console
+ */
+void
+cons_expose(void)
+{
+    static int once = 0;
+    char devname[] = "console";
+    devmajor_t major;
+    dev_t dev;
+
+    /* Only run once */
+    if (once) {
+        return;
+    }
+
+    /* Register the device here */
+    major = dev_alloc_major();
+    dev = dev_alloc(major);
+    dev_register(major, dev, &cons_cdevsw);
+    devfs_create_entry(devname, major, dev, 0444);
+    once ^= 1;
+}
+
+static struct cdevsw cons_cdevsw = {
+    .read = noread,
+    .write = dev_write
+};
diff --git a/sys/include/dev/cons/cons.h b/sys/include/dev/cons/cons.h
index fe7eb6d..3415617 100644
--- a/sys/include/dev/cons/cons.h
+++ b/sys/include/dev/cons/cons.h
@@ -56,6 +56,7 @@ struct cons_screen {
 };
 
 void cons_init(void);
+void cons_expose(void);
 int cons_putch(struct cons_screen *scr, char c);
 
 extern struct cons_screen g_root_scr;
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 1fb3418..f3f88d7 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -83,6 +83,9 @@ main(void)
 
     DRIVERS_INIT();
 
+    /* Expose the console to devfs */
+    cons_expose();
+
     /* Start scheduler and bootstrap APs */
     sched_init();
     mp_bootstrap_aps(&g_bsp_ci);