diff options
| -rw-r--r-- | hw/scsi/esp.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index a818b2b..3f7cf30 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -1209,6 +1209,33 @@ static int esp_post_load(void *opaque, int version_id) return 0; } +/* + * PDMA (or pseudo-DMA) is only used on the Macintosh and requires the + * guest CPU to perform the transfers between the SCSI bus and memory + * itself. This is indicated by the dma_memory_read and dma_memory_write + * functions being NULL (in contrast to the ESP PCI device) whilst + * dma_enabled is still set. + */ + +static bool esp_pdma_needed(void *opaque) +{ + ESPState *s = ESP(opaque); + + return s->dma_memory_read == NULL && s->dma_memory_write == NULL && + s->dma_enabled; +} + +static const VMStateDescription vmstate_esp_pdma = { + .name = "esp/pdma", + .version_id = 0, + .minimum_version_id = 0, + .needed = esp_pdma_needed, + .fields = (VMStateField[]) { + VMSTATE_UINT8(pdma_cb, ESPState), + VMSTATE_END_OF_LIST() + } +}; + const VMStateDescription vmstate_esp = { .name = "esp", .version_id = 6, @@ -1243,6 +1270,10 @@ const VMStateDescription vmstate_esp = { VMSTATE_UINT8_TEST(lun, ESPState, esp_is_version_6), VMSTATE_END_OF_LIST() }, + .subsections = (const VMStateDescription * []) { + &vmstate_esp_pdma, + NULL + } }; static void sysbus_esp_mem_write(void *opaque, hwaddr addr, |