Archipelago » qemu

static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_dev)

{

    uint64_t resid;

    int sg_cur_index;

    resid = sg->size;

    sg_cur_index = 0;

    len = MIN(len, resid);

    while (len > 0) {

        ScatterGatherEntry entry = sg->sg[sg_cur_index++];

        int32_t xfer = MIN(len, entry.len);

        cpu_physical_memory_rw(entry.base, ptr, xfer, !to_dev);

        ptr += xfer;

        len -= xfer;

        resid -= xfer;

    }

    return resid;

}

uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg)

{

    return dma_buf_rw(ptr, len, sg, 0);

}

uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg)

{

    return dma_buf_rw(ptr, len, sg, 1);

}