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pc, pc64: set *bootscreen= when framebuffer changes

add bootscreenconf(VGAscr *) function, that is called whenever
the framebuffer configuration is changed by devvga. that way, we
can pass the current setting of the framebuffer to the new
kernel when using /dev/reboot.

--- a/sys/src/9/pc/devvga.c

+++ b/sys/src/9/pc/devvga.c

@@ -329,6 +329,7 @@

 	case CMtextmode:

 		screeninit();

+		bootscreenconf(nil);

 		return;

 	case CMsize:

@@ -357,6 +358,7 @@

 		deletescreenimage();

 		if(screensize(x, y, z, chan))

 			error(Egreg);

+		bootscreenconf(scr);

 		return;

 	case CMactualsize:

--- a/sys/src/9/pc/screen.c

+++ b/sys/src/9/pc/screen.c

@@ -586,7 +586,7 @@

 /*

  * called early on boot to attach to framebuffer

- * setup by bootloader or firmware.

+ * setup by bootloader/firmware or plan9.

  */

 void

 bootscreeninit(void)

@@ -664,4 +664,24 @@

 	scr->cur = &swcursor;

 	scr->cur->enable(scr);

 	cursoron();

+}

+

+/*

+ * called from devvga when the framebuffer is setup

+ * to set *bootscreen= that can be passed on to a

+ * new kernel on reboot.

+ */

+void

+bootscreenconf(VGAscr *scr)

+{

+	char conf[100], chan[30];

+

+	conf[0] = '\0';

+	if(scr != nil && scr->paddr != 0)

+		snprint(conf, sizeof(conf), "%dx%dx%d %s %#p %d\n",

+			scr->gscreen->r.max.x, scr->gscreen->r.max.y,

+			scr->gscreen->depth, chantostr(chan, scr->gscreen->chan),

+			scr->paddr, scr->apsize);

+

+	ksetenv("*bootscreen", conf, 1);

 }

--- a/sys/src/9/pc/screen.h

+++ b/sys/src/9/pc/screen.h

@@ -149,6 +149,9 @@

 extern Rectangle physgscreenr;	/* actual monitor size */

 extern void	blankscreen(int);

+extern void	bootscreeninit(void);

+extern void	bootscreenconf(VGAscr*);

+

 extern VGAcur swcursor;

 extern void swcursorinit(void);

 extern void swcursorhide(void);