95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_SDEVIO
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m2_i3: DIO_REQUEST (request input or output)
|
|
* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
|
|
* m2_l1: DIO_PORT (port to read/ write)
|
|
* m2_p1: DIO_VEC_ADDR (virtual address of buffer)
|
|
* m2_l2: DIO_VEC_SIZE (number of elements)
|
|
* m2_i2: DIO_VEC_PROC (process where buffer is)
|
|
*/
|
|
|
|
#include "../system.h"
|
|
#include <minix/devio.h>
|
|
#include <minix/endpoint.h>
|
|
|
|
#if USE_SDEVIO
|
|
|
|
/*===========================================================================*
|
|
* do_sdevio *
|
|
*===========================================================================*/
|
|
PUBLIC int do_sdevio(m_ptr)
|
|
register message *m_ptr; /* pointer to request message */
|
|
{
|
|
int proc_nr, proc_nr_e = m_ptr->DIO_VEC_ENDPT;
|
|
int count = m_ptr->DIO_VEC_SIZE;
|
|
long port = m_ptr->DIO_PORT;
|
|
phys_bytes phys_buf;
|
|
int req_type, req_dir;
|
|
|
|
if ((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) != _DIO_SAFE)
|
|
{
|
|
static int first= 1;
|
|
if (first)
|
|
{
|
|
first= 0;
|
|
kprintf("do_sdevio: for %d\n", m_ptr->m_source);
|
|
}
|
|
}
|
|
|
|
/* Check if process endpoint is OK.
|
|
* A driver may directly provide a pointer to a buffer at the user-process
|
|
* that initiated the device I/O. Kernel processes, of course, are denied.
|
|
*/
|
|
if (proc_nr_e == SELF)
|
|
proc_nr = who_p;
|
|
else
|
|
if(!isokendpt(proc_nr_e, &proc_nr))
|
|
return(EINVAL);
|
|
if (iskerneln(proc_nr)) return(EPERM);
|
|
|
|
/* Extract direction (in or out) and type (size). */
|
|
req_dir = m_ptr->DIO_REQUEST & _DIO_DIRMASK;
|
|
req_type = m_ptr->DIO_REQUEST & _DIO_TYPEMASK;
|
|
|
|
/* Check for 'safe' variants. */
|
|
if((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) == _DIO_SAFE) {
|
|
/* Map grant address to physical address. */
|
|
if ((phys_buf = umap_verify_grant(proc_addr(proc_nr), who_e,
|
|
(vir_bytes) m_ptr->DIO_VEC_ADDR,
|
|
(vir_bytes) m_ptr->DIO_OFFSET, count,
|
|
req_dir == _DIO_INPUT ? CPF_WRITE : CPF_READ)) == 0)
|
|
return(EPERM);
|
|
} else {
|
|
if(proc_nr != who_p)
|
|
kprintf("unsafe sdevio by %d in %d\n", who_e, proc_nr_e);
|
|
/* Get and check physical address. */
|
|
if ((phys_buf = numap_local(proc_nr,
|
|
(vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
|
|
return(EFAULT);
|
|
}
|
|
|
|
/* Perform device I/O for bytes and words. Longs are not supported. */
|
|
if (req_dir == _DIO_INPUT) {
|
|
switch (req_type) {
|
|
case _DIO_BYTE: phys_insb(port, phys_buf, count); break;
|
|
case _DIO_WORD: phys_insw(port, phys_buf, count); break;
|
|
default: return(EINVAL);
|
|
}
|
|
} else if (req_dir == _DIO_OUTPUT) {
|
|
switch (req_type) {
|
|
case _DIO_BYTE: phys_outsb(port, phys_buf, count); break;
|
|
case _DIO_WORD: phys_outsw(port, phys_buf, count); break;
|
|
default: return(EINVAL);
|
|
}
|
|
}
|
|
else {
|
|
return(EINVAL);
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
#endif /* USE_SDEVIO */
|
|
|