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kernel: handle 64-bit multiboot framebuffer address

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

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

@@ -64,12 +64,12 @@

 				(1UL<<p[3])-1 << p[2],

 				(1UL<<p[5])-1 << p[4]);

 			}

-			cp = seprint(cp, ep, "*bootscreen=%dx%dx%d %s %#lux\n",

+			cp = seprint(cp, ep, "*bootscreen=%dx%dx%d %s %#llux\n",

 				(int)multiboot[24]*8 / depth,

 				(int)multiboot[26],

 				depth,

 				chan,

-				multiboot[22]);

+				(uvlong)multiboot[23]<<32 | multiboot[22]);

 		}

 	} else

 	if((multiboot[0] & (1<<11)) != 0 && multiboot[19] != 0)		/* vbe mode info */