diff options
Diffstat (limited to 'hw/ide')
-rw-r--r-- | hw/ide/core.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/hw/ide/core.c b/hw/ide/core.c index ca17a436c0..a29ae9fb90 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -56,6 +56,7 @@ static const int smart_attributes[][12] = { }; static int ide_handle_rw_error(IDEState *s, int error, int op); +static void ide_dummy_transfer_stop(IDEState *s); static void padstr(char *str, const char *src, int len) { @@ -1532,15 +1533,36 @@ void ide_cmd_write(void *opaque, uint32_t addr, uint32_t val) bus->cmd = val; } +/* + * Returns true if the running PIO transfer is a PIO out (i.e. data is + * transferred from the device to the guest), false if it's a PIO in + */ +static bool ide_is_pio_out(IDEState *s) +{ + if (s->end_transfer_func == ide_sector_write || + s->end_transfer_func == ide_atapi_cmd) { + return false; + } else if (s->end_transfer_func == ide_sector_read || + s->end_transfer_func == ide_transfer_stop || + s->end_transfer_func == ide_atapi_cmd_reply_end || + s->end_transfer_func == ide_dummy_transfer_stop) { + return true; + } + + abort(); +} + void ide_data_writew(void *opaque, uint32_t addr, uint32_t val) { IDEBus *bus = opaque; IDEState *s = idebus_active_if(bus); uint8_t *p; - /* PIO data access allowed only when DRQ bit is set */ - if (!(s->status & DRQ_STAT)) + /* PIO data access allowed only when DRQ bit is set. The result of a write + * during PIO out is indeterminate, just ignore it. */ + if (!(s->status & DRQ_STAT) || ide_is_pio_out(s)) { return; + } p = s->data_ptr; *(uint16_t *)p = le16_to_cpu(val); @@ -1557,9 +1579,11 @@ uint32_t ide_data_readw(void *opaque, uint32_t addr) uint8_t *p; int ret; - /* PIO data access allowed only when DRQ bit is set */ - if (!(s->status & DRQ_STAT)) + /* PIO data access allowed only when DRQ bit is set. The result of a read + * during PIO in is indeterminate, return 0 and don't move forward. */ + if (!(s->status & DRQ_STAT) || !ide_is_pio_out(s)) { return 0; + } p = s->data_ptr; ret = cpu_to_le16(*(uint16_t *)p); @@ -1576,9 +1600,11 @@ void ide_data_writel(void *opaque, uint32_t addr, uint32_t val) IDEState *s = idebus_active_if(bus); uint8_t *p; - /* PIO data access allowed only when DRQ bit is set */ - if (!(s->status & DRQ_STAT)) + /* PIO data access allowed only when DRQ bit is set. The result of a write + * during PIO out is indeterminate, just ignore it. */ + if (!(s->status & DRQ_STAT) || ide_is_pio_out(s)) { return; + } p = s->data_ptr; *(uint32_t *)p = le32_to_cpu(val); @@ -1595,9 +1621,11 @@ uint32_t ide_data_readl(void *opaque, uint32_t addr) uint8_t *p; int ret; - /* PIO data access allowed only when DRQ bit is set */ - if (!(s->status & DRQ_STAT)) + /* PIO data access allowed only when DRQ bit is set. The result of a read + * during PIO in is indeterminate, return 0 and don't move forward. */ + if (!(s->status & DRQ_STAT) || !ide_is_pio_out(s)) { return 0; + } p = s->data_ptr; ret = cpu_to_le32(*(uint32_t *)p); |