| 1 | /* The kernel call implemented in this file:
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| 2 | * m_type: SYS_DEVIO
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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_l2: DIO_VALUE (value to write/ return value read)
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| 9 | */
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| 10 |
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| 11 | #include "../system.h"
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| 12 | #include <minix/devio.h>
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| 13 | #include <minix/endpoint.h>
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| 14 |
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| 15 | #if USE_DEVIO
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| 16 |
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| 17 | /*===========================================================================*
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| 18 | * do_devio *
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| 19 | *===========================================================================*/
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| 20 | PUBLIC int do_devio(m_ptr)
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| 21 | register message *m_ptr; /* pointer to request message */
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| 22 | {
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| 23 | struct proc *rp;
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| 24 | struct priv *privp;
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| 25 | port_t port;
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| 26 | struct io_range *iorp;
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| 27 | int i, size, nr_io_range;
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| 28 |
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| 29 | rp= proc_addr(who_p);
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| 30 | privp= priv(rp);
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| 31 | if (!privp)
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| 32 | {
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| 33 | kprintf("no priv structure!\n");
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| 34 | goto doit;
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| 35 | }
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| 36 | if (privp->s_flags & CHECK_IO_PORT)
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| 37 | {
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| 38 | switch (m_ptr->DIO_TYPE)
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| 39 | {
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| 40 | case DIO_BYTE: size= 1; break;
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| 41 | case DIO_WORD: size= 2; break;
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| 42 | case DIO_LONG: size= 4; break;
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| 43 | default: size= 4; break; /* Be conservative */
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| 44 | }
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| 45 | port= m_ptr->DIO_PORT;
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| 46 | nr_io_range= privp->s_nr_io_range;
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| 47 | for (i= 0, iorp= privp->s_io_tab; i<nr_io_range; i++, iorp++)
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| 48 | {
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| 49 | if (port >= iorp->ior_base && port+size-1 <= iorp->ior_limit)
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| 50 | break;
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| 51 | }
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| 52 | if (i >= nr_io_range)
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| 53 | {
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| 54 | kprintf(
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| 55 | "do_devio: I/O port check failed for proc %d, port 0x%x\n",
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| 56 | m_ptr->m_source, port);
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| 57 | return EPERM;
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | doit:
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| 62 |
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| 63 | /* Process a single I/O request for byte, word, and long values. */
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| 64 | if (m_ptr->DIO_REQUEST == DIO_INPUT) {
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| 65 | switch (m_ptr->DIO_TYPE) {
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| 66 | case DIO_BYTE: m_ptr->DIO_VALUE = inb(m_ptr->DIO_PORT); break;
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| 67 | case DIO_WORD: m_ptr->DIO_VALUE = inw(m_ptr->DIO_PORT); break;
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| 68 | case DIO_LONG: m_ptr->DIO_VALUE = inl(m_ptr->DIO_PORT); break;
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| 69 | default: return(EINVAL);
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| 70 | }
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| 71 | } else {
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| 72 | switch (m_ptr->DIO_TYPE) {
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| 73 | case DIO_BYTE: outb(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
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| 74 | case DIO_WORD: outw(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
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| 75 | case DIO_LONG: outl(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
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| 76 | default: return(EINVAL);
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| 77 | }
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| 78 | }
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| 79 | return(OK);
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| 80 | }
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| 81 |
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| 82 | #endif /* USE_DEVIO */
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