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added a segment for segattach(2) that gives access to the raspberry pi's gpio header.

--- a/sys/src/9/bcm/main.c

+++ b/sys/src/9/bcm/main.c

@@ -216,6 +216,19 @@

 }

 void

+gpiomeminit(void)

+{

+	Physseg seg;

+	memset(&seg, 0, sizeof seg);

+	seg.attr = SG_PHYSICAL;

+	seg.name = "gpio";

+	seg.pa = (VIRTIO+0x200000);

+	seg.size = 1;

+	addphysseg(&seg);

+}

+

+

+void

 main(void)

 {

 	extern char edata[], end[];

@@ -259,6 +272,7 @@

 	pageinit();

 	swapinit();

 	userinit();

+	gpiomeminit();

 	schedinit();

 	assert(0);			/* shouldn't have returned */

 }

-- 

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