| [4] | 1 | /* The kernel call implemented in this file:
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| 2 | * m_type: SYS_VDEVIO
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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_p1: DIO_VEC_ADDR (pointer to port/ value pairs)
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| 8 | * m2_i2: DIO_VEC_SIZE (number of ports to read or write)
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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 |
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| 14 | #if USE_VDEVIO
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| 15 |
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| 16 | /* Buffer for SYS_VDEVIO to copy (port,value)-pairs from/ to user. */
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| 17 | PRIVATE char vdevio_buf[VDEVIO_BUF_SIZE];
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| 18 | PRIVATE pvb_pair_t *pvb = (pvb_pair_t *) vdevio_buf;
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| 19 | PRIVATE pvw_pair_t *pvw = (pvw_pair_t *) vdevio_buf;
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| 20 | PRIVATE pvl_pair_t *pvl = (pvl_pair_t *) vdevio_buf;
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| 21 |
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| 22 | /*===========================================================================*
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| 23 | * do_vdevio *
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| 24 | *===========================================================================*/
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| 25 | PUBLIC int do_vdevio(m_ptr)
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| 26 | register message *m_ptr; /* pointer to request message */
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| 27 | {
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| 28 | /* Perform a series of device I/O on behalf of a non-kernel process. The
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| 29 | * I/O addresses and I/O values are fetched from and returned to some buffer
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| 30 | * in user space. The actual I/O is wrapped by lock() and unlock() to prevent
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| 31 | * that I/O batch from being interrrupted.
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| 32 | * This is the counterpart of do_devio, which performs a single device I/O.
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| 33 | */
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| 34 | int vec_size; /* size of vector */
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| 35 | int io_in; /* true if input */
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| 36 | size_t bytes; /* # bytes to be copied */
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| 37 | int caller_proc; /* process number of caller */
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| 38 | vir_bytes caller_vir; /* virtual address at caller */
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| 39 | phys_bytes caller_phys; /* physical address at caller */
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| 40 | int i;
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| 41 |
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| 42 | /* Get the request, size of the request vector, and check the values. */
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| 43 | if (m_ptr->DIO_REQUEST == DIO_INPUT) io_in = TRUE;
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| 44 | else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) io_in = FALSE;
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| 45 | else return(EINVAL);
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| 46 | if ((vec_size = m_ptr->DIO_VEC_SIZE) <= 0) return(EINVAL);
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| 47 | switch (m_ptr->DIO_TYPE) {
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| 48 | case DIO_BYTE: bytes = vec_size * sizeof(pvb_pair_t); break;
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| 49 | case DIO_WORD: bytes = vec_size * sizeof(pvw_pair_t); break;
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| 50 | case DIO_LONG: bytes = vec_size * sizeof(pvl_pair_t); break;
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| 51 | default: return(EINVAL); /* check type once and for all */
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| 52 | }
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| 53 | if (bytes > sizeof(vdevio_buf)) return(E2BIG);
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| 54 |
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| 55 | /* Calculate physical addresses and copy (port,value)-pairs from user. */
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| 56 | caller_proc = m_ptr->m_source;
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| 57 | caller_vir = (vir_bytes) m_ptr->DIO_VEC_ADDR;
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| 58 | caller_phys = umap_local(proc_addr(caller_proc), D, caller_vir, bytes);
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| 59 | if (0 == caller_phys) return(EFAULT);
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| 60 | phys_copy(caller_phys, vir2phys(vdevio_buf), (phys_bytes) bytes);
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| 61 |
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| 62 | /* Perform actual device I/O for byte, word, and long values. Note that
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| 63 | * the entire switch is wrapped in lock() and unlock() to prevent the I/O
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| 64 | * batch from being interrupted.
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| 65 | */
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| 66 | lock(13, "do_vdevio");
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| 67 | switch (m_ptr->DIO_TYPE) {
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| 68 | case DIO_BYTE: /* byte values */
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| 69 | if (io_in) for (i=0; i<vec_size; i++) pvb[i].value = inb(pvb[i].port);
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| 70 | else for (i=0; i<vec_size; i++) outb(pvb[i].port, pvb[i].value);
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| 71 | break;
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| 72 | case DIO_WORD: /* word values */
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| 73 | if (io_in) for (i=0; i<vec_size; i++) pvw[i].value = inw(pvw[i].port);
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| 74 | else for (i=0; i<vec_size; i++) outw(pvw[i].port, pvw[i].value);
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| 75 | break;
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| 76 | default: /* long values */
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| 77 | if (io_in) for (i=0; i<vec_size; i++) pvl[i].value = inl(pvl[i].port);
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| 78 | else for (i=0; i<vec_size; i++) outl(pvb[i].port, pvl[i].value);
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| 79 | }
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| 80 | unlock(13);
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| 81 |
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| 82 | /* Almost done, copy back results for input requests. */
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| 83 | if (io_in) phys_copy(vir2phys(vdevio_buf), caller_phys, (phys_bytes) bytes);
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| 84 | return(OK);
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| 85 | }
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| 86 |
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| 87 | #endif /* USE_VDEVIO */
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| 88 |
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