x86, setup: When probing memory with e801, use ax/bx as a pair

When we use BIOS function e801 to probe memory, we should use ax/bx
(or cx/dx) as a pair, not mix and match.  This was a typo during the
translation from assembly code, and breaks at least one set of
machines in the field (which return cx = dx = 0).

Reported-and-tested-by: Chris Samuel <chris@csamuel.org>
Fix-proposed-by: Thomas Meyer <thomas@m3y3r.de>
Link: http://lkml.kernel.org/r/1303566747.12067.10.camel@localhost.localdomain

diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c
index cae3feb..db75d07 100644 (file)
--- a/arch/x86/boot/memory.c
+++ b/arch/x86/boot/memory.c
@@ -91,7 +91,7 @@ static int detect_memory_e801(void)
        if (oreg.ax > 15*1024) {
                return -1;      /* Bogus! */
        } else if (oreg.ax == 15*1024) {
-               boot_params.alt_mem_k = (oreg.dx << 6) + oreg.ax;
+               boot_params.alt_mem_k = (oreg.bx << 6) + oreg.ax;
        } else {
                /*
                 * This ignores memory above 16MB if we have a memory