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[Qemu-devel] [PATCH 1/2] register reset handler for option_roms
From: |
Glauber Costa |
Subject: |
[Qemu-devel] [PATCH 1/2] register reset handler for option_roms |
Date: |
Fri, 8 May 2009 02:22:12 -0300 |
Currently, boot options are not preserved across a system reset.
option roms can modify themselves, or can for instance restore the real
int 0x19 vector after they tried to boot from it.
To properly do that, we need a reset handler registered to deal with option
roms. This patch is based on current version on qemu-kvm.git
Signed-off-by: Glauber Costa <address@hidden>
---
hw/pc.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index 61f6e7b..0025474 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -63,6 +63,30 @@ static PITState *pit;
static IOAPICState *ioapic;
static PCIDevice *i440fx_state;
+typedef struct rom_reset_data {
+ uint8_t *data;
+ target_phys_addr_t addr;
+ unsigned size;
+} RomResetData;
+
+static void option_rom_reset(void *_rrd)
+{
+ RomResetData *rrd = _rrd;
+
+ cpu_physical_memory_write_rom(rrd->addr, rrd->data, rrd->size);
+}
+
+static void option_rom_setup_reset(target_phys_addr_t addr, unsigned size)
+{
+ RomResetData *rrd = qemu_malloc(sizeof *rrd);
+
+ rrd->data = qemu_malloc(size);
+ cpu_physical_memory_read(addr, rrd->data, size);
+ rrd->addr = addr;
+ rrd->size = size;
+ qemu_register_reset(option_rom_reset, rrd);
+}
+
static void ioport80_write(void *opaque, uint32_t addr, uint32_t data)
{
}
@@ -806,6 +830,7 @@ static int load_option_rom(const char *oprom,
target_phys_addr_t start,
}
/* Round up optiom rom size to the next 2k boundary */
size = (size + 2047) & ~2047;
+ option_rom_setup_reset(start, size);
return size;
}
--
1.6.2.2