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[Qemu-devel] [PATCH 1/2] pc: make vgabios exit port more useful
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [PATCH 1/2] pc: make vgabios exit port more useful |
Date: |
Mon, 8 Aug 2011 14:31:37 -0500 |
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 <address@hidden>
---
hw/pc.c | 4 ++--
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);
--
1.7.4.1
- [Qemu-devel] [PATCH 1/2] pc: make vgabios exit port more useful,
Anthony Liguori <=