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authorAnthony Liguori <aliguori@us.ibm.com>2011-08-08 14:31:37 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2011-08-12 08:27:00 -0500
commit4333979e3d8c129953bba36ed87ce543d33cbea1 (patch)
tree397b3930ea9effa60bc0c01b3071fd0b7f938956
parent9b024b5f965a3c11aa65435df5b9e8f1cc24d3fa (diff)
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pc: make vgabios exit port more useful
We've always listened on port 501 for vgabios panic messages. In the entire time I've worked on QEMU, I've never actually seen a vgabios panic message :-) If we change the semantics of this port a little bit, it makes it possible to use it for more interesting use-cases. I chose this approach instead of adding a new I/O port because it avoids having a guest visible change. This change allows single-byte access to port 501 and also uses the value written to construct an exit code. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
-rw-r--r--hw/pc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/pc.c b/hw/pc.c
index 1c9d89a..4b07b35 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -549,8 +549,7 @@ static void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)
/* LGPL'ed VGA BIOS messages */
case 0x501:
case 0x502:
- fprintf(stderr, "VGA BIOS panic, line %d\n", val);
- exit(1);
+ exit((val << 1) | 1);
case 0x500:
case 0x503:
#ifdef DEBUG_BIOS
@@ -591,6 +590,7 @@ static void *bochs_bios_init(void)
register_ioport_write(0x403, 1, 1, bochs_bios_write, NULL);
register_ioport_write(0x8900, 1, 1, bochs_bios_write, NULL);
+ register_ioport_write(0x501, 1, 1, bochs_bios_write, NULL);
register_ioport_write(0x501, 1, 2, bochs_bios_write, NULL);
register_ioport_write(0x502, 1, 2, bochs_bios_write, NULL);
register_ioport_write(0x500, 1, 1, bochs_bios_write, NULL);