127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/* The kernel 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 kernel 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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#include <minix/endpoint.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, proc_nr_e = m_ptr->DIO_VEC_ENDPT;
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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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int i, req_type, req_dir, io_type, size, nr_io_range;
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struct proc *rp;
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struct priv *privp;
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struct io_range *iorp;
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/* Allow safe copies and accesses to SELF */
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if ((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) != _DIO_SAFE &&
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proc_nr_e != SELF)
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{
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static int first= 1;
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if (first)
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{
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first= 0;
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kprintf("do_sdevio: for %d, req %d\n",
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m_ptr->m_source, m_ptr->DIO_REQUEST);
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}
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}
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/* Check if process endpoint is OK.
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* A driver may directly provide a pointer to a buffer at the user-process
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* that initiated the device I/O. Kernel processes, of course, are denied.
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*/
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if (proc_nr_e == SELF)
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proc_nr = who_p;
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else
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if(!isokendpt(proc_nr_e, &proc_nr))
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return(EINVAL);
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if (iskerneln(proc_nr)) return(EPERM);
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/* Extract direction (in or out) and type (size). */
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req_dir = m_ptr->DIO_REQUEST & _DIO_DIRMASK;
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req_type = m_ptr->DIO_REQUEST & _DIO_TYPEMASK;
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/* Check for 'safe' variants. */
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if((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) == _DIO_SAFE) {
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/* Map grant address to physical address. */
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if ((phys_buf = umap_verify_grant(proc_addr(proc_nr), who_e,
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(vir_bytes) m_ptr->DIO_VEC_ADDR,
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(vir_bytes) m_ptr->DIO_OFFSET, count,
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req_dir == _DIO_INPUT ? CPF_WRITE : CPF_READ)) == 0)
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return(EPERM);
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} else {
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if(proc_nr != who_p)
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kprintf("unsafe sdevio by %d in %d\n", who_e, proc_nr_e);
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/* Get and check physical address. */
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if ((phys_buf = numap_local(proc_nr,
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(vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
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return(EFAULT);
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}
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rp= proc_addr(who_p);
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if (privp && privp->s_flags & CHECK_IO_PORT)
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{
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switch (io_type)
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{
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case _DIO_BYTE: size= 1; break;
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case _DIO_WORD: size= 2; break;
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case _DIO_LONG: size= 4; break;
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default: size= 4; break; /* Be conservative */
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}
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port= m_ptr->DIO_PORT;
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nr_io_range= privp->s_nr_io_range;
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for (i= 0, iorp= privp->s_io_tab; i<nr_io_range; i++, iorp++)
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{
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if (port >= iorp->ior_base && port+size-1 <= iorp->ior_limit)
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break;
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}
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if (i >= nr_io_range)
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{
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kprintf(
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"do_sdevio: I/O port check failed for proc %d, port 0x%x\n",
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m_ptr->m_source, port);
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return EPERM;
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}
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}
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/* Perform device I/O for bytes and words. Longs are not supported. */
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if (req_dir == _DIO_INPUT) {
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switch (req_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 (req_dir == _DIO_OUTPUT) {
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switch (req_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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