From: Philip Homburg <philip@cs.vu.nl>
Date: Wed, 9 Nov 2005 15:45:48 +0000 (+0000)
Subject: Added /dev/video for mapping video memory.
X-Git-Tag: v3.1.2a~508
X-Git-Url: http://zhaoyanbai.com/repos/Bv9ARM.ch08.html?a=commitdiff_plain;h=5556281540effc60615f56191bc584be1ff1a553;p=minix.git

Added /dev/video for mapping video memory.
---

diff --git a/drivers/tty/console.c b/drivers/tty/console.c
index 15deeb98d..18ff7c36f 100644
--- a/drivers/tty/console.c
+++ b/drivers/tty/console.c
@@ -18,6 +18,8 @@
 
 #include "../drivers.h"
 #include <termios.h>
+#include <sys/ioctl.h>
+#include <sys/vm.h>
 #include <minix/callnr.h>
 #include <minix/com.h>
 #include "tty.h"
@@ -766,6 +768,61 @@ PRIVATE void beep()
 }
 
 
+/*===========================================================================*
+ *				do_video				     *
+ *===========================================================================*/
+PUBLIC void do_video(message *m)
+{
+	int i, n, r, ops, watch;
+	unsigned char c;
+
+	/* Execute the requested device driver function. */
+	r= EINVAL;	/* just in case */
+	switch (m->m_type) {
+	    case DEV_OPEN:
+		/* Should grant IOPL */
+		r= OK;
+		break;
+	    case DEV_CLOSE:
+		r= OK;
+		break;
+	    case DEV_IOCTL:
+		if (m->TTY_REQUEST == MIOCMAP || m->TTY_REQUEST == MIOCUNMAP)
+		{
+			int r, do_map;
+			struct mapreq mapreq;
+
+			do_map= (m->REQUEST == MIOCMAP);	/* else unmap */
+
+			/* Get request structure */
+			r= sys_vircopy(m->PROC_NR, D,
+				(vir_bytes)m->ADDRESS,
+				SELF, D, (vir_bytes)&mapreq, sizeof(mapreq));
+			if (r != OK)
+			{
+				tty_reply(TASK_REPLY, m->m_source, m->PROC_NR,
+					r);
+				return;
+			}
+			r= sys_vm_map(m->PROC_NR, do_map,
+				(phys_bytes)mapreq.base, mapreq.size,
+				mapreq.offset);
+			tty_reply(TASK_REPLY, m->m_source, m->PROC_NR, r);
+			return;
+		}
+		r= ENOTTY;
+		break;
+
+	    default:		
+		printf(
+		"Warning, TTY(video) got unexpected request %d from %d\n",
+			m->m_type, m->m_source);
+		r= EINVAL;
+	}
+	tty_reply(TASK_REPLY, m->m_source, m->PROC_NR, r);
+}
+
+
 /*===========================================================================*
  *				beep_x					     *
  *===========================================================================*/
diff --git a/drivers/tty/tty.c b/drivers/tty/tty.c
index bcf8e2ebe..4da224165 100644
--- a/drivers/tty/tty.c
+++ b/drivers/tty/tty.c
@@ -272,6 +272,9 @@ PUBLIC void main(void)
 	} else if (line == KBDAUX_MINOR) {
 		do_kbdaux(&tty_mess);
 		continue;
+	} else if (line == VIDEO_MINOR) {
+		do_video(&tty_mess);
+		continue;
 	} else if ((line - CONS_MINOR) < NR_CONS) {
 		tp = tty_addr(line - CONS_MINOR);
 	} else if (line == LOG_MINOR) {
diff --git a/drivers/tty/tty.h b/drivers/tty/tty.h
index 433d4ed88..6809029b4 100644
--- a/drivers/tty/tty.h
+++ b/drivers/tty/tty.h
@@ -9,10 +9,11 @@
 
 /* First minor numbers for the various classes of TTY devices. */
 #define CONS_MINOR	   0
-#define KBD_MINOR	  13
-#define KBDAUX_MINOR	  14
 #define LOG_MINOR	  15
 #define RS232_MINOR	  16
+#define KBD_MINOR	 127
+#define KBDAUX_MINOR	 126
+#define VIDEO_MINOR	 125
 #define TTYPX_MINOR	 128
 #define PTYPX_MINOR	 192
 
@@ -167,6 +168,7 @@ _PROTOTYPE( void toggle_scroll, (void)					);
 _PROTOTYPE( int con_loadfont, (message *m)				);
 _PROTOTYPE( void select_console, (int cons_line)			);
 _PROTOTYPE( void beep_x, ( unsigned freq, clock_t dur)			);
+_PROTOTYPE( void do_video, (message *m)					);
 
 /* keyboard.c */
 _PROTOTYPE( void kb_init, (struct tty *tp)				);