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/*
* Port-based I/O routines. These are in a separate module because most
* drivers will not use them, and system services are statically linked.
*/
#include <minix/drivers.h>
#include <minix/netdriver.h>
#include <assert.h>
#include "netdriver.h"
/*
* Port-based I/O byte sequence copy routine.
*/
static void
netdriver_portb(struct netdriver_data * data, size_t off, long port,
size_t size, int portin)
{
size_t chunk;
unsigned int i;
int r, req;
off = netdriver_prepare_copy(data, off, size, &i);
req = portin ? DIO_SAFE_INPUT_BYTE : DIO_SAFE_OUTPUT_BYTE;
while (size > 0) {
chunk = data->iovec[i].iov_size - off;
if (chunk > size)
chunk = size;
assert(chunk > 0);
if ((r = sys_sdevio(req, port, data->endpt,
(void *)data->iovec[i].iov_grant, chunk, off)) != OK)
panic("netdriver: port I/O failed: %d", r);
i++;
off = 0;
size -= chunk;
}
}
/*
* Transfer bytes from hardware to a destination buffer using port-based I/O.
*/
void
netdriver_portinb(struct netdriver_data * data, size_t off, long port,
size_t size)
{
return netdriver_portb(data, off, port, size, TRUE /*portin*/);
}
/*
* Transfer bytes from a source buffer to hardware using port-based I/O.
*/
void
netdriver_portoutb(struct netdriver_data * data, size_t off, long port,
size_t size)
{
return netdriver_portb(data, off, port, size, FALSE /*portin*/);
}
/*
* Transfer words from hardware to a destination buffer using port-based I/O.
*/
void
netdriver_portinw(struct netdriver_data * data, size_t off, long port,
size_t size)
{
uint16_t buf;
uint32_t value;
size_t chunk;
unsigned int i;
int r, odd_byte;
off = netdriver_prepare_copy(data, off, size, &i);
odd_byte = 0;
while (size > 0) {
chunk = data->iovec[i].iov_size - off;
if (chunk > size)
chunk = size;
assert(chunk > 0);
if (odd_byte) {
if ((r = sys_safecopyto(data->endpt,
data->iovec[i].iov_grant, off,
(vir_bytes)&((char *)&buf)[1], 1)) != OK)
panic("netdriver: unable to copy data: %d", r);
off++;
size--;
chunk--;
}
odd_byte = chunk & 1;
chunk -= odd_byte;
if (chunk > 0) {
if ((r = sys_safe_insw(port, data->endpt,
data->iovec[i].iov_grant, off, chunk)) != OK)
panic("netdriver: port input failed: %d", r);
off += chunk;
size -= chunk;
}
if (odd_byte) {
if ((r = sys_inw(port, &value)) != OK)
panic("netdriver: port input failed: %d", r);
buf = (uint16_t)value;
if ((r = sys_safecopyto(data->endpt,
data->iovec[i].iov_grant, off,
(vir_bytes)&((char *)&buf)[0], 1)) != OK)
panic("netdriver: unable to copy data: %d", r);
size--;
}
i++;
off = 0;
}
}
/*
* Transfer words from a source buffer to hardware using port-based I/O.
*/
void
netdriver_portoutw(struct netdriver_data * data, size_t off, long port,
size_t size)
{
uint16_t buf;
size_t chunk;
unsigned int i;
int r, odd_byte;
off = netdriver_prepare_copy(data, off, size, &i);
odd_byte = 0;
while (size > 0) {
chunk = data->iovec[i].iov_size - off;
if (chunk > size)
chunk = size;
assert(chunk > 0);
if (odd_byte) {
if ((r = sys_safecopyfrom(data->endpt,
data->iovec[i].iov_grant, off,
(vir_bytes)&((char *)&buf)[1], 1)) != OK)
panic("netdriver: unable to copy data: %d", r);
if ((r = sys_outw(port, buf)) != OK)
panic("netdriver: port output failed: %d", r);
off++;
size--;
chunk--;
}
odd_byte = chunk & 1;
chunk -= odd_byte;
if (chunk > 0) {
if ((r = sys_safe_outsw(port, data->endpt,
data->iovec[i].iov_grant, off, chunk)) != OK)
panic("netdriver: port output failed: %d", r);
off += chunk;
size -= chunk;
}
if (odd_byte) {
if ((r = sys_safecopyfrom(data->endpt,
data->iovec[i].iov_grant, off,
(vir_bytes)&((char *)&buf)[0], 1)) != OK)
panic("netdriver: unable to copy data: %d", r);
size--;
}
i++;
off = 0;
}
if (odd_byte) {
((char *)&buf)[1] = 0;
if ((r = sys_outw(port, buf)) != OK)
panic("netdriver: port output failed: %d", r);
}
}
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