"General command" (GEN_CMD, CMD56) is described as:
GEN_CMD is the same as the single block read or write
commands (CMD24 or CMD17). The difference is that [...]
the data block is not a memory payload data but has a
vendor specific format and meaning.
Thus this block must not be stored overwriting data block
on underlying storage drive. Keep it in a dedicated
'vendor_data[]' array.
Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
Tested-by: Cédric Le Goater <clg@xxxxxxxxxx>
---
RFC: Is it safe to reuse VMSTATE_UNUSED_V() (which happens
to be the same size)?
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Fabiano Rosas <farosas@xxxxxxx>
---
hw/sd/sd.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 464576751a..1f3eea6e84 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -142,6 +142,8 @@ struct SDState {
uint64_t data_start;
uint32_t data_offset;
uint8_t data[512];
+ uint8_t vendor_data[512];
+
qemu_irq readonly_cb;
qemu_irq inserted_cb;
QEMUTimer *ocr_power_timer;
@@ -656,6 +658,7 @@ static void sd_reset(DeviceState *dev)
sd->wp_switch = sd->blk ? !blk_is_writable(sd->blk) : false;
sd->wp_group_bits = sect;
sd->wp_group_bmap = bitmap_new(sd->wp_group_bits);
+ memset(sd->vendor_data, 0xec, sizeof(sd->vendor_data));
memset(sd->function_group, 0, sizeof(sd->function_group));
sd->erase_start = INVALID_ADDRESS;
sd->erase_end = INVALID_ADDRESS;
@@ -771,7 +774,7 @@ static const VMStateDescription sd_vmstate = {
VMSTATE_UINT64(data_start, SDState),
VMSTATE_UINT32(data_offset, SDState),
VMSTATE_UINT8_ARRAY(data, SDState, 512),
- VMSTATE_UNUSED_V(1, 512),
+ VMSTATE_UINT8_ARRAY(vendor_data, SDState, 512),
VMSTATE_BOOL(enable, SDState),
VMSTATE_END_OF_LIST()
},
@@ -2029,9 +2032,8 @@ void sd_write_byte(SDState *sd, uint8_t value)
break;
case 56: /* CMD56: GEN_CMD */
- sd->data[sd->data_offset ++] = value;
- if (sd->data_offset >= sd->blk_len) {
- APP_WRITE_BLOCK(sd->data_start, sd->data_offset);
+ sd->vendor_data[sd->data_offset ++] = value;
+ if (sd->data_offset >= sizeof(sd->vendor_data)) {
sd->state = sd_transfer_state;
}
break;
@@ -2165,12 +2167,11 @@ uint8_t sd_read_byte(SDState *sd)
break;
case 56: /* CMD56: GEN_CMD */
- if (sd->data_offset == 0)
- APP_READ_BLOCK(sd->data_start, sd->blk_len);
- ret = sd->data[sd->data_offset ++];
+ ret = sd->vendor_data[sd->data_offset ++];
- if (sd->data_offset >= sd->blk_len)
+ if (sd->data_offset >= sizeof(sd->vendor_data)) {
sd->state = sd_transfer_state;
+ }
break;
default:
--
2.41.0
