Python md_first_seg примеры использования

Пример #1

Файл: am79c900_diag.py Проект: The-Programming-Foundation/os-test-deprecated

stop()
wrbcr(20, 2)  # reset
wrcsr(3, 0)  # byte swapping mode
wrbcr(2, rdbcr(2) | 2)  # Autoneg

memsize = 32 * 1024
bufsize = 1536
nrxbufs = 16
ntxbufs = 4
logging.debug("DMA memory: size = %#x (TX buffers: %u, RX buffers: %u)" %
              (memsize, ntxbufs, nrxbufs))

mem_tag = busdma.tag_create(dev, 16, 0, 0xffffffff, memsize, 1, memsize, 0, 0)
dmamem = busdma.mem_alloc(mem_tag, 0)
busseg = busdma.md_first_seg(dmamem, busdma.MD_BUS_SPACE)
cpuseg = busdma.md_first_seg(dmamem, busdma.MD_VIRT_SPACE)
busaddr = busdma.seg_get_addr(busseg)
cpuaddr = busdma.seg_get_addr(cpuseg)
logging.debug("DMA memory: CPU address: %#x, device address: %#x" %
              (cpuaddr, busaddr))

addr_initblock = cpuaddr
addr_rxdesc = addr_initblock + ctypes.sizeof(initblock)
addr_txdesc = addr_rxdesc + ctypes.sizeof(bufdesc) * nrxbufs
addr_rxbufs = addr_txdesc + ctypes.sizeof(bufdesc) * ntxbufs
addr_txbufs = addr_rxbufs + bufsize * nrxbufs

ib = initblock.from_address(addr_initblock)
ib.mode = ((ffs(ntxbufs) - 1) << 28) | ((ffs(nrxbufs) - 1) << 20)
for i in xrange(len(mac)):

Пример #2

Файл: am79c900_diag.py Проект: 2asoft/freebsd

stop()
wrbcr(20, 2)            # reset
wrcsr(3, 0)             # byte swapping mode
wrbcr(2, rdbcr(2) | 2)  # Autoneg

memsize = 32*1024
bufsize = 1536
nrxbufs = 16
ntxbufs = 4
logging.debug("DMA memory: size = %#x (TX buffers: %u, RX buffers: %u)" %
              (memsize, ntxbufs, nrxbufs))

mem_tag = busdma.tag_create(dev, 16, 0, 0xffffffff, memsize, 1, memsize, 0, 0)
dmamem = busdma.mem_alloc(mem_tag, 0)
busseg = busdma.md_first_seg(dmamem, busdma.MD_BUS_SPACE)
cpuseg = busdma.md_first_seg(dmamem, busdma.MD_VIRT_SPACE)
busaddr = busdma.seg_get_addr(busseg)
cpuaddr = busdma.seg_get_addr(cpuseg)
logging.debug("DMA memory: CPU address: %#x, device address: %#x" %
              (cpuaddr, busaddr))

addr_initblock = cpuaddr
addr_rxdesc = addr_initblock + ctypes.sizeof(initblock)
addr_txdesc = addr_rxdesc + ctypes.sizeof(bufdesc) * nrxbufs
addr_rxbufs = addr_txdesc + ctypes.sizeof(bufdesc) * ntxbufs
addr_txbufs = addr_rxbufs + bufsize * nrxbufs

ib = initblock.from_address(addr_initblock)
ib.mode = ((ffs(ntxbufs) - 1) << 28) | ((ffs(nrxbufs) - 1) << 20)
for i in xrange(len(mac)):