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register reset handler for option_roms

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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 <glommer@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Glauber Costa 2009-05-08 02:22:12 -03:00 committed by Anthony Liguori
parent d4d698f020
commit e28f988427
1 changed files with 25 additions and 0 deletions
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25
hw/pc.c
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@ -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;
}