@@ -1047,6 +1047,7 @@ static bool ide_cmd_permitted(IDEState *s, uint32_t cmd)
void ide_exec_cmd(IDEBus *bus, uint32_t val)
{
+ uint16_t *identify_data;
IDEState *s;
int n;
int lba48 = 0;
@@ -1231,10 +1232,21 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
goto abort_cmd;
/* XXX: valid for CDROM ? */
switch(s->feature) {
- case 0xcc: /* reverting to power-on defaults enable */
- case 0x66: /* reverting to power-on defaults disable */
case 0x02: /* write cache enable */
+ bdrv_set_enable_write_cache(s->bs, true);
+ identify_data = (uint16_t *)s->identify_data;
+ put_le16(identify_data + 85, (1 << 14) | (1 << 5) | 1);
+ s->status = READY_STAT | SEEK_STAT;
+ ide_set_irq(s->bus);
+ break;
case 0x82: /* write cache disable */
+ bdrv_set_enable_write_cache(s->bs, false);
+ identify_data = (uint16_t *)s->identify_data;
+ put_le16(identify_data + 85, (1 << 14) | 1);
+ ide_flush_cache(s);
+ break;
+ case 0xcc: /* reverting to power-on defaults enable */
+ case 0x66: /* reverting to power-on defaults disable */
case 0xaa: /* read look-ahead enable */
case 0x55: /* read look-ahead disable */
case 0x05: /* set advanced power management mode */
@@ -1250,7 +1262,7 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
break;
case 0x03: { /* set transfer mode */
uint8_t val = s->nsector & 0x07;
- uint16_t *identify_data = (uint16_t *)s->identify_data;
+ identify_data = (uint16_t *)s->identify_data;
switch (s->nsector >> 3) {
case 0x00: /* pio default */
Enabling or disabling the write cache is done with the SET FEATURES command. The command can be issued with sg_sat_set_features from sg3-utils. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- hw/ide/core.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)