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minix/kernel/system/devio.c
Ben Gras c977bd8709 Added args to lock() and unlock() to tell them apart, for use 
when lock timing is enabled in minix/config.h.

Added phys_zero() routine to klib386.s that zeroes a range of memory, and
added corresponding system call.
2005-06-01 09:37:52 +00:00

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/* The system call implemented in this file:
* m_type: SYS_DEVIO
*
* The parameters for this system call are:
* m2_i3: DIO_REQUEST (request input or output)
* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
* m2_l1: DIO_PORT (port to read/ write)
* m2_l2: DIO_VALUE (value to write/ return value read)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
#include "../kernel.h"
#include "../system.h"
#include "../debug.h"
#include <minix/devio.h>
/*===========================================================================*
* do_devio *
*===========================================================================*/
PUBLIC int do_devio(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* perform actual device I/O for byte, word, and long values */
if (m_ptr->DIO_REQUEST == DIO_INPUT) {
switch (m_ptr->DIO_TYPE) {
case DIO_BYTE: m_ptr->DIO_VALUE = inb(m_ptr->DIO_PORT); break;
case DIO_WORD: m_ptr->DIO_VALUE = inw(m_ptr->DIO_PORT); break;
case DIO_LONG: m_ptr->DIO_VALUE = inl(m_ptr->DIO_PORT); break;
default: return(EINVAL);
}
} else {
switch (m_ptr->DIO_TYPE) {
case DIO_BYTE: outb(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
case DIO_WORD: outw(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
case DIO_LONG: outl(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
default: return(EINVAL);
}
}
return(OK);
}
/* The system call implemented in this file:
* m_type: SYS_SDEVIO
*
* The parameters for this system call are:
* m2_i3: DIO_REQUEST (request input or output)
* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
* m2_l1: DIO_PORT (port to read/ write)
* m2_p1: DIO_VEC_ADDR (virtual address of buffer)
* m2_l2: DIO_VEC_SIZE (number of elements)
* m2_i2: DIO_VEC_PROC (process where buffer is)
*/
/*===========================================================================*
* do_sdevio *
*===========================================================================*/
PUBLIC int do_sdevio(m_ptr)
register message *m_ptr; /* pointer to request message */
{
int proc_nr = m_ptr->DIO_VEC_PROC;
int count = m_ptr->DIO_VEC_SIZE;
long port = m_ptr->DIO_PORT;
phys_bytes phys_buf;
/* Check if process number is OK. */
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
if (! isokprocn(proc_nr))
return(EINVAL);
/* Get and check physical address. */
if ((phys_buf = numap_local(proc_nr, (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
return(EFAULT);
/* Perform device I/O for bytes and words. Longs are not supported. */
if (m_ptr->DIO_REQUEST == DIO_INPUT) {
switch (m_ptr->DIO_TYPE) {
case DIO_BYTE: phys_insb(port, phys_buf, count); break;
case DIO_WORD: phys_insw(port, phys_buf, count); break;
default: return(EINVAL);
}
} else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) {
switch (m_ptr->DIO_TYPE) {
case DIO_BYTE: phys_outsb(port, phys_buf, count); break;
case DIO_WORD: phys_outsw(port, phys_buf, count); break;
default: return(EINVAL);
}
}
else {
return(EINVAL);
}
return(OK);
}
/* The system call implemented in this file:
* m_type: SYS_VDEVIO
*
* The parameters for this system call are:
* m2_i3: DIO_REQUEST (request input or output)
* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
* m2_p1: DIO_VEC_ADDR (pointer to port/ value pairs)
* m2_i2: DIO_VEC_SIZE (number of ports to read or write)
*/
/* Buffer for SYS_VDEVIO to copy (port,value)-pairs from/ to user. */
PRIVATE char vdevio_pv_buf[VDEVIO_BUF_SIZE];
/* SYS_VDEVIO sends a pointer to a (port,value)-pairs vector at the caller.
* Define the maximum number of (port,value)-pairs that can be handled in a
* in a single SYS_VDEVIO system call based on the struct definitions.
*/
#define MAX_PVB_PAIRS ((VDEVIO_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t))
#define MAX_PVW_PAIRS ((VDEVIO_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t))
#define MAX_PVL_PAIRS ((VDEVIO_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t))
/*===========================================================================*
* do_vdevio *
*===========================================================================*/
PUBLIC int do_vdevio(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Perform a series of device I/O on behalf of a non-kernel process. The
* I/O addresses and I/O values are fetched from and returned to some buffer
* in user space. The actual I/O is wrapped by lock() and unlock() to prevent
* that I/O batch from being interrrupted.
* This is the counterpart of do_devio, which performs a single device I/O.
*/
pvb_pair_t *pvb_pairs; /* needed for byte values */
pvw_pair_t *pvw_pairs; /* needed for word values */
pvl_pair_t *pvl_pairs; /* needed for long values */
int i;
pid_t caller_pid; /* process id of caller */
size_t bytes; /* # bytes to be copied */
vir_bytes caller_vir; /* virtual address at caller */
phys_bytes caller_phys; /* physical address at caller */
phys_bytes kernel_phys; /* physical address in kernel */
/* Check if nr of ports is ok and get size of (port,value) data. */
if (m_ptr->DIO_VEC_SIZE <= 0) return(EINVAL);
switch(m_ptr->DIO_TYPE) {
case DIO_BYTE:
if (m_ptr->DIO_VEC_SIZE > MAX_PVB_PAIRS) return(EINVAL);
bytes = (size_t) (m_ptr->DIO_VEC_SIZE * sizeof(pvb_pair_t));
break;
case DIO_WORD:
if (m_ptr->DIO_VEC_SIZE > MAX_PVW_PAIRS) return(EINVAL);
bytes = (size_t) (m_ptr->DIO_VEC_SIZE * sizeof(pvw_pair_t));
break;
case DIO_LONG:
if (m_ptr->DIO_VEC_SIZE > MAX_PVL_PAIRS) return(EINVAL);
bytes = (size_t) (m_ptr->DIO_VEC_SIZE * sizeof(pvl_pair_t));
break;
default: /* this once and for all checks for a correct type */
return(EINVAL);
}
/* Calculate physical addresses and copy (port,value)-pairs from user. */
caller_pid = (pid_t) m_ptr->m_source;
caller_vir = (vir_bytes) m_ptr->DIO_VEC_ADDR;
caller_phys = umap_local(proc_addr(caller_pid), D, caller_vir, bytes);
if (0 == caller_phys) return EFAULT;
kernel_phys = vir2phys(vdevio_pv_buf);
phys_copy(caller_phys, kernel_phys, (phys_bytes) bytes);
/* Perform actual device I/O for byte, word, and long values. Note that
* the entire switch is wrapped in lock() and unlock() to prevent the I/O
* batch from being interrupted. It may be cleaner to do this just around
* the for loops, but this results in rather lenghty code.
*/
lock(13, "do_vdevio");
switch (m_ptr->DIO_TYPE) {
case DIO_BYTE: /* byte values */
pvb_pairs = (pvb_pair_t *) vdevio_pv_buf;
if (DIO_INPUT == m_ptr->DIO_REQUEST) {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
pvb_pairs[i].value = inb(pvb_pairs[i].port);
} else {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
outb(pvb_pairs[i].port, pvb_pairs[i].value);
}
break;
case DIO_WORD: /* word values */
pvw_pairs = (pvw_pair_t *) vdevio_pv_buf;
if (DIO_INPUT == m_ptr->DIO_REQUEST) {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
pvw_pairs[i].value = inw(pvw_pairs[i].port);
} else {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
outw(pvw_pairs[i].port, pvw_pairs[i].value);
}
break;
case DIO_LONG: /* fall through: long values */
default: /* only DIO_LONG can arrive here, see above switch */
pvl_pairs = (pvl_pair_t *) vdevio_pv_buf;
if (DIO_INPUT == m_ptr->DIO_REQUEST) {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
pvl_pairs[i].value = inl(pvl_pairs[i].port);
} else {
for (i=0; i < m_ptr->DIO_VEC_SIZE; i++)
outl(pvb_pairs[i].port, pvl_pairs[i].value);
}
}
unlock(13);
/* Almost done, copy back results for input requests. */
if (DIO_INPUT == m_ptr->REQUEST)
phys_copy(kernel_phys, caller_phys, (phys_bytes) bytes);
return(OK);
}
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