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