134 lines
4.6 KiB
C
134 lines
4.6 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_VDEVIO
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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_p1: DIO_VEC_ADDR (pointer to port/ value pairs)
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* m2_i2: DIO_VEC_SIZE (number of ports to read or write)
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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_VDEVIO
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/* Buffer for SYS_VDEVIO to copy (port,value)-pairs from/ to user. */
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PRIVATE char vdevio_buf[VDEVIO_BUF_SIZE];
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PRIVATE pvb_pair_t *pvb = (pvb_pair_t *) vdevio_buf;
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PRIVATE pvw_pair_t *pvw = (pvw_pair_t *) vdevio_buf;
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PRIVATE pvl_pair_t *pvl = (pvl_pair_t *) vdevio_buf;
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/*===========================================================================*
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* do_vdevio *
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*===========================================================================*/
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PUBLIC int do_vdevio(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Perform a series of device I/O on behalf of a non-kernel process. The
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* I/O addresses and I/O values are fetched from and returned to some buffer
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* in user space. The actual I/O is wrapped by lock() and unlock() to prevent
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* that I/O batch from being interrrupted.
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* This is the counterpart of do_devio, which performs a single device I/O.
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*/
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int vec_size; /* size of vector */
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int io_in; /* true if input */
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size_t bytes; /* # bytes to be copied */
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vir_bytes caller_vir; /* virtual address at caller */
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phys_bytes caller_phys; /* physical address at caller */
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port_t port;
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int i, j, io_size, nr_io_range;
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int io_dir, io_type;
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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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/* Get the request, size of the request vector, and check the values. */
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io_dir = m_ptr->DIO_REQUEST & _DIO_DIRMASK;
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io_type = m_ptr->DIO_REQUEST & _DIO_TYPEMASK;
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if (io_dir == _DIO_INPUT) io_in = TRUE;
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else if (io_dir == _DIO_OUTPUT) io_in = FALSE;
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else return(EINVAL);
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if ((vec_size = m_ptr->DIO_VEC_SIZE) <= 0) return(EINVAL);
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switch (io_type) {
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case _DIO_BYTE:
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bytes = vec_size * sizeof(pvb_pair_t);
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io_size= sizeof(u8_t);
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break;
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case _DIO_WORD:
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bytes = vec_size * sizeof(pvw_pair_t);
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io_size= sizeof(u16_t);
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break;
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case _DIO_LONG:
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bytes = vec_size * sizeof(pvl_pair_t);
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io_size= sizeof(u32_t);
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break;
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default: return(EINVAL); /* check type once and for all */
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}
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if (bytes > sizeof(vdevio_buf)) return(E2BIG);
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/* Calculate physical addresses and copy (port,value)-pairs from user. */
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caller_vir = (vir_bytes) m_ptr->DIO_VEC_ADDR;
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caller_phys = umap_local(proc_addr(who_p), D, caller_vir, bytes);
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if (0 == caller_phys) return(EFAULT);
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phys_copy(caller_phys, vir2phys(vdevio_buf), (phys_bytes) bytes);
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rp= proc_addr(who_p);
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privp= priv(rp);
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if (privp && (privp->s_flags & CHECK_IO_PORT))
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{
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/* Check whether the I/O is allowed */
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nr_io_range= privp->s_nr_io_range;
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for (i=0; i<vec_size; i++)
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{
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switch (io_type) {
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case _DIO_BYTE: port= pvb[i].port; break;
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case _DIO_WORD: port= pvw[i].port; break;
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default: port= pvl[i].port; break;
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}
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for (j= 0, iorp= privp->s_io_tab; j<nr_io_range; j++, iorp++)
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{
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if (port >= iorp->ior_base &&
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port+io_size-1 <= iorp->ior_limit)
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{
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break;
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}
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}
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if (j >= nr_io_range)
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{
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kprintf(
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"do_vdevio: 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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}
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/* Perform actual device I/O for byte, word, and long values. Note that
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* the entire switch is wrapped in lock() and unlock() to prevent the I/O
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* batch from being interrupted.
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*/
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lock(13, "do_vdevio");
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switch (io_type) {
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case _DIO_BYTE: /* byte values */
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if (io_in) for (i=0; i<vec_size; i++) pvb[i].value = inb(pvb[i].port);
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else for (i=0; i<vec_size; i++) outb(pvb[i].port, pvb[i].value);
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break;
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case _DIO_WORD: /* word values */
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if (io_in) for (i=0; i<vec_size; i++) pvw[i].value = inw(pvw[i].port);
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else for (i=0; i<vec_size; i++) outw(pvw[i].port, pvw[i].value);
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break;
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default: /* long values */
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if (io_in) for (i=0; i<vec_size; i++) pvl[i].value = inl(pvl[i].port);
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else for (i=0; i<vec_size; i++) outl(pvb[i].port, pvl[i].value);
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}
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unlock(13);
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/* Almost done, copy back results for input requests. */
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if (io_in) phys_copy(vir2phys(vdevio_buf), caller_phys, (phys_bytes) bytes);
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return(OK);
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}
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#endif /* USE_VDEVIO */
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