198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_SDEVIO
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*
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* The parameters for this system call are:
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* m2_i3: DIO_REQUEST (request input or output)
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* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
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* m2_l1: DIO_PORT (port to read/ write)
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* m2_p1: DIO_VEC_ADDR (virtual address of buffer)
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* m2_l2: DIO_VEC_SIZE (number of elements)
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* m2_i2: DIO_VEC_PROC (process where buffer is)
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*/
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#include "../system.h"
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#include <minix/devio.h>
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#if USE_SDEVIO
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/*===========================================================================*
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* do_sdevio *
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*===========================================================================*/
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PUBLIC int do_sdevio(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int proc_nr = m_ptr->DIO_VEC_PROC;
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int count = m_ptr->DIO_VEC_SIZE;
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long port = m_ptr->DIO_PORT;
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phys_bytes phys_buf;
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/* Check if process number is OK. */
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if (proc_nr == SELF) proc_nr = m_ptr->m_source;
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if (! isokprocn(proc_nr))
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return(EINVAL);
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/* Get and check physical address. */
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if ((phys_buf = numap_local(proc_nr, (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
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return(EFAULT);
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/* Perform device I/O for bytes and words. Longs are not supported. */
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if (m_ptr->DIO_REQUEST == DIO_INPUT) {
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: phys_insb(port, phys_buf, count); break;
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case DIO_WORD: phys_insw(port, phys_buf, count); break;
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default: return(EINVAL);
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}
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} else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) {
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: phys_outsb(port, phys_buf, count); break;
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case DIO_WORD: phys_outsw(port, phys_buf, count); break;
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default: return(EINVAL);
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}
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}
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else {
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return(EINVAL);
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}
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return(OK);
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}
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#endif /* USE_SDEVIO */
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