| [9] | 1 | /* The kernel call implemented in this file:
|
|---|
| 2 | * m_type: SYS_SDEVIO
|
|---|
| 3 | *
|
|---|
| 4 | * The parameters for this kernel call are:
|
|---|
| 5 | * m2_i3: DIO_REQUEST (request input or output)
|
|---|
| 6 | * m2_i1: DIO_TYPE (flag indicating byte, word, or long)
|
|---|
| 7 | * m2_l1: DIO_PORT (port to read/ write)
|
|---|
| 8 | * m2_p1: DIO_VEC_ADDR (virtual address of buffer)
|
|---|
| 9 | * m2_l2: DIO_VEC_SIZE (number of elements)
|
|---|
| 10 | * m2_i2: DIO_VEC_PROC (process where buffer is)
|
|---|
| 11 | */
|
|---|
| 12 |
|
|---|
| 13 | #include "../system.h"
|
|---|
| 14 | #include <minix/devio.h>
|
|---|
| 15 | #include <minix/endpoint.h>
|
|---|
| 16 |
|
|---|
| 17 | #if USE_SDEVIO
|
|---|
| 18 |
|
|---|
| 19 | /*===========================================================================*
|
|---|
| 20 | * do_sdevio *
|
|---|
| 21 | *===========================================================================*/
|
|---|
| 22 | PUBLIC int do_sdevio(m_ptr)
|
|---|
| 23 | register message *m_ptr; /* pointer to request message */
|
|---|
| 24 | {
|
|---|
| 25 | int proc_nr, proc_nr_e = m_ptr->DIO_VEC_ENDPT;
|
|---|
| 26 | int count = m_ptr->DIO_VEC_SIZE;
|
|---|
| 27 | long port = m_ptr->DIO_PORT;
|
|---|
| 28 | phys_bytes phys_buf;
|
|---|
| 29 |
|
|---|
| 30 | /* Check if process endpoint is OK.
|
|---|
| 31 | * A driver may directly provide a pointer to a buffer at the user-process
|
|---|
| 32 | * that initiated the device I/O. Kernel processes, of course, are denied.
|
|---|
| 33 | */
|
|---|
| 34 | if (proc_nr_e == SELF)
|
|---|
| 35 | proc_nr = who_p;
|
|---|
| 36 | else
|
|---|
| 37 | if(!isokendpt(proc_nr_e, &proc_nr))
|
|---|
| 38 | return(EINVAL);
|
|---|
| 39 | if (iskerneln(proc_nr)) return(EPERM);
|
|---|
| 40 |
|
|---|
| 41 | /* Get and check physical address. */
|
|---|
| 42 | if ((phys_buf = numap_local(proc_nr, (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
|
|---|
| 43 | return(EFAULT);
|
|---|
| 44 |
|
|---|
| 45 | /* Perform device I/O for bytes and words. Longs are not supported. */
|
|---|
| 46 | if (m_ptr->DIO_REQUEST == DIO_INPUT) {
|
|---|
| 47 | switch (m_ptr->DIO_TYPE) {
|
|---|
| 48 | case DIO_BYTE: phys_insb(port, phys_buf, count); break;
|
|---|
| 49 | case DIO_WORD: phys_insw(port, phys_buf, count); break;
|
|---|
| 50 | default: return(EINVAL);
|
|---|
| 51 | }
|
|---|
| 52 | } else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) {
|
|---|
| 53 | switch (m_ptr->DIO_TYPE) {
|
|---|
| 54 | case DIO_BYTE: phys_outsb(port, phys_buf, count); break;
|
|---|
| 55 | case DIO_WORD: phys_outsw(port, phys_buf, count); break;
|
|---|
| 56 | default: return(EINVAL);
|
|---|
| 57 | }
|
|---|
| 58 | }
|
|---|
| 59 | else {
|
|---|
| 60 | return(EINVAL);
|
|---|
| 61 | }
|
|---|
| 62 | return(OK);
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | #endif /* USE_SDEVIO */
|
|---|
| 66 |
|
|---|
