Compaq TRU64 AA-RNG2A-TE Manual de usuario descargar pdf (Pagina 118)

in the middle. The mfree( ) routine is called to free any zero-length

memory buffers.

Otherwise, adds the length and sets the next memory buffer in the

chain to the mp mbuf pointer.

9.2.3 Transmitting the Buffer

The following code shows how the el_start_locked( ) routine transmits

the buffer:

WRITE_DATA(sc, len | TX_INT); 1

dat = mtod(ms, unsigned char *);

len = ms->m_len;

while (ms != NULL) {

io_blockwrite((vm_offset_t)dat,

sc->data,

(u_long)(len & ~ 3),

HANDLE_LONGWORD);

dat += (len & ~ 3);

ms = ms->m_next;

i=len%4;

if (ms == NULL) {

if (i) {

val = 0;

for (j=0; j<i; j++)

val |= (*dat++ << (8*j));

WRITE_DATA(sc, val);

}

} else {

if (i) {

val = 0;

for (j=0; j<i; j++)

val |= (*dat++ << (8*j));

dat = mtod(ms, unsigned char *);

if (ms->m_len <= (4-i)) {

for (j=0; j<ms->m_len; j++)

val |= (*dat++ << (8*(j+i)));

ms = NULL;

} else {

len = ms->m_len - (4-i);

for (j=i; j<4; j++)

val |= (*dat++ << (8*j));

}

WRITE_DATA(sc, val);

} else {

dat = mtod(ms, unsigned char *);

len = ms->m_len;

}

1 Requests an interrupt upon completion of the transmit operation.

9–6 Implementing the Start Section

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 158 159

Comentarios a estos manuales

Sin comentarios

Compaq TRU64 AA-RNG2A-TE Manual de usuario Pagina 118

Comentarios a estos manuales

Relacionado con productos y manuales para Hardware Compaq TRU64 AA-RNG2A-TE