420 lines
13 KiB
C
420 lines
13 KiB
C
/* This file contains device independent device driver interface.
|
|
* Author: Kees J. Bot.
|
|
* Changes:
|
|
* Sep 15, 2004 added SYN_ALARM type for timeouts (Jorrit N. Herder)
|
|
* Aug 18, 2004 added HARD_STOP type for shutdown (Jorrit N. Herder)
|
|
* Jul 23, 2004 removed kernel dependencies (Jorrit N. Herder)
|
|
*
|
|
*
|
|
* The drivers support the following operations (using message format m2):
|
|
*
|
|
* m_type DEVICE PROC_NR COUNT POSITION ADRRESS
|
|
* ----------------------------------------------------------------
|
|
* | DEV_OPEN | device | proc nr | | | |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_CLOSE | device | proc nr | | | |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_READ | device | proc nr | bytes | offset | buf ptr |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_WRITE | device | proc nr | bytes | offset | buf ptr |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_GATHER | device | proc nr | iov len | offset | iov ptr |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_SCATTER| device | proc nr | iov len | offset | iov ptr |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | DEV_IOCTL | device | proc nr |func code| | buf ptr |
|
|
* |------------+---------+---------+---------+---------+---------|
|
|
* | HARD_STOP | | | | | |
|
|
* ----------------------------------------------------------------
|
|
*
|
|
* The file contains one entry point:
|
|
*
|
|
* driver_task: called by the device dependent task entry
|
|
*
|
|
*
|
|
* Constructed 92/04/02 by Kees J. Bot from the old AT wini and floppy driver.
|
|
*/
|
|
|
|
#include "../drivers.h"
|
|
#include <sys/ioc_disk.h>
|
|
#include "driver.h"
|
|
|
|
|
|
#if (CHIP == INTEL)
|
|
#if ENABLE_AHA1540_SCSI && DMA_BUF_SIZE < 2048
|
|
/* A bit extra scratch for the Adaptec driver. */
|
|
#define BUF_EXTRA (2048 - DMA_BUF_SIZE)
|
|
#else
|
|
#define BUF_EXTRA 0
|
|
#endif
|
|
|
|
/* Claim space for variables. */
|
|
PRIVATE u8_t buffer[(unsigned) 2 * DMA_BUF_SIZE + BUF_EXTRA];
|
|
u8_t *tmp_buf; /* the DMA buffer eventually */
|
|
phys_bytes tmp_phys; /* phys address of DMA buffer */
|
|
|
|
#else /* CHIP != INTEL */
|
|
|
|
/* Claim space for variables. */
|
|
u8_t tmp_buf[DMA_BUF_SIZE]; /* the DMA buffer */
|
|
phys_bytes tmp_phys; /* phys address of DMA buffer */
|
|
|
|
#endif /* CHIP != INTEL */
|
|
|
|
FORWARD _PROTOTYPE( void init_buffer, (void) );
|
|
FORWARD _PROTOTYPE( int do_rdwt, (struct driver *dr, message *mp) );
|
|
FORWARD _PROTOTYPE( int do_vrdwt, (struct driver *dr, message *mp) );
|
|
|
|
PRIVATE unsigned long dev_read_count;
|
|
PRIVATE unsigned long dev_write_count;
|
|
PRIVATE unsigned long dev_gather_count;
|
|
PRIVATE unsigned long dev_scatter_count;
|
|
|
|
/*===========================================================================*
|
|
* driver_task *
|
|
*===========================================================================*/
|
|
PUBLIC void driver_task(dp)
|
|
struct driver *dp; /* Device dependent entry points. */
|
|
{
|
|
/* Main program of any device driver task. */
|
|
|
|
int r, caller, proc_nr;
|
|
message mess;
|
|
int s;
|
|
|
|
/* Get a DMA buffer. */
|
|
init_buffer();
|
|
|
|
/* Here is the main loop of the disk task. It waits for a message, carries
|
|
* it out, and sends a reply.
|
|
*/
|
|
while (TRUE) {
|
|
|
|
/* Wait for a request to read or write a disk block. */
|
|
receive(ANY, &mess);
|
|
|
|
caller = mess.m_source;
|
|
proc_nr = mess.PROC_NR;
|
|
|
|
#if DEAD_CODE /* drivers, like TTY can have any number */
|
|
/* Check if legitimate caller: FS or a task. */
|
|
if (caller != FS_PROC_NR && caller >= 0) {
|
|
printf("%s: got message from %d\n", (*dp->dr_name)(), caller);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/* Now carry out the work. */
|
|
switch(mess.m_type) {
|
|
case DEV_OPEN: r = (*dp->dr_open)(dp, &mess); break;
|
|
case DEV_CLOSE: r = (*dp->dr_close)(dp, &mess); break;
|
|
case DEV_IOCTL: r = (*dp->dr_ioctl)(dp, &mess); break;
|
|
|
|
case DEV_READ: dev_read_count ++;
|
|
case DEV_WRITE: dev_write_count ++;
|
|
r = do_rdwt(dp, &mess); break;
|
|
case DEV_GATHER: dev_gather_count ++;
|
|
case DEV_SCATTER: dev_scatter_count ++;
|
|
r = do_vrdwt(dp, &mess); break;
|
|
|
|
case HARD_INT: /* leftover interrupt or expired timer. */
|
|
continue;
|
|
case HARD_STOP: (*dp->dr_stop)(dp);
|
|
continue; /* don't reply */
|
|
case SYN_ALARM: (*dp->dr_alarm)(dp);
|
|
continue; /* don't reply */
|
|
case FKEY_PRESSED: (*dp->dr_fkey)(dp, &mess);
|
|
continue; /* don't reply */
|
|
default: r = EINVAL; break;
|
|
}
|
|
|
|
/* Clean up leftover state. */
|
|
(*dp->dr_cleanup)();
|
|
|
|
/* Finally, prepare and send the reply message. */
|
|
mess.m_type = TASK_REPLY;
|
|
mess.REP_PROC_NR = proc_nr;
|
|
|
|
mess.REP_STATUS = r; /* # of bytes transferred or error code */
|
|
send(caller, &mess); /* send reply to caller */
|
|
}
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* init_buffer *
|
|
*===========================================================================*/
|
|
PRIVATE void init_buffer()
|
|
{
|
|
/* Select a buffer that can safely be used for DMA transfers. It may also
|
|
* be used to read partition tables and such. Its absolute address is
|
|
* 'tmp_phys', the normal address is 'tmp_buf'.
|
|
*/
|
|
|
|
#if (CHIP == INTEL)
|
|
unsigned left;
|
|
|
|
tmp_buf = buffer;
|
|
sys_umap(SELF, D, (vir_bytes)buffer, (phys_bytes)sizeof(buffer), &tmp_phys);
|
|
|
|
if ((left = dma_bytes_left(tmp_phys)) < DMA_BUF_SIZE) {
|
|
/* First half of buffer crosses a 64K boundary, can't DMA into that */
|
|
tmp_buf += left;
|
|
tmp_phys += left;
|
|
}
|
|
#else /* CHIP != INTEL */
|
|
tmp_phys = vir2phys(tmp_buf);
|
|
#endif /* CHIP != INTEL */
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_rdwt *
|
|
*===========================================================================*/
|
|
PRIVATE int do_rdwt(dp, mp)
|
|
struct driver *dp; /* device dependent entry points */
|
|
message *mp; /* pointer to read or write message */
|
|
{
|
|
/* Carry out a single read or write request. */
|
|
iovec_t iovec1;
|
|
int r, opcode;
|
|
phys_bytes phys_addr;
|
|
|
|
/* Disk address? Address and length of the user buffer? */
|
|
if (mp->COUNT < 0) return(EINVAL);
|
|
|
|
/* Check the user buffer. */
|
|
sys_umap(mp->PROC_NR, D, (vir_bytes) mp->ADDRESS, mp->COUNT, &phys_addr);
|
|
if (phys_addr == 0) return(EFAULT);
|
|
|
|
/* Prepare for I/O. */
|
|
if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
|
|
|
|
/* Create a one element scatter/gather vector for the buffer. */
|
|
opcode = mp->m_type == DEV_READ ? DEV_GATHER : DEV_SCATTER;
|
|
iovec1.iov_addr = (vir_bytes) mp->ADDRESS;
|
|
iovec1.iov_size = mp->COUNT;
|
|
|
|
/* Transfer bytes from/to the device. */
|
|
r = (*dp->dr_transfer)(mp->PROC_NR, opcode, mp->POSITION, &iovec1, 1);
|
|
|
|
/* Return the number of bytes transferred or an error code. */
|
|
return(r == OK ? (mp->COUNT - iovec1.iov_size) : r);
|
|
}
|
|
|
|
|
|
/*==========================================================================*
|
|
* do_vrdwt *
|
|
*==========================================================================*/
|
|
PRIVATE int do_vrdwt(dp, mp)
|
|
struct driver *dp; /* device dependent entry points */
|
|
message *mp; /* pointer to read or write message */
|
|
{
|
|
/* Carry out an device read or write to/from a vector of user addresses.
|
|
* The "user addresses" are assumed to be safe, i.e. FS transferring to/from
|
|
* its own buffers, so they are not checked.
|
|
*/
|
|
static iovec_t iovec[NR_IOREQS];
|
|
iovec_t *iov;
|
|
phys_bytes iovec_phys, user_iovec_phys;
|
|
phys_bytes iovec_size;
|
|
unsigned nr_req;
|
|
int r;
|
|
|
|
nr_req = mp->COUNT; /* Length of I/O vector */
|
|
|
|
if (mp->m_source < 0) {
|
|
/* Called by a task, no need to copy vector. */
|
|
iov = (iovec_t *) mp->ADDRESS;
|
|
} else {
|
|
/* Copy the vector from the caller to kernel space. */
|
|
if (nr_req > NR_IOREQS) nr_req = NR_IOREQS;
|
|
iovec_size = (phys_bytes) (nr_req * sizeof(iovec[0]));
|
|
|
|
if (OK != sys_datacopy(mp->m_source, (vir_bytes) mp->ADDRESS,
|
|
SELF, (vir_bytes) iovec, iovec_size))
|
|
server_panic((*dp->dr_name)(),"bad I/O vector by", mp->m_source);
|
|
#if DEAD_CODE
|
|
sys_umap(mp->m_source, (vir_bytes) mp->ADDRESS,
|
|
iovec_size, &user_iovec_phys);
|
|
if (user_iovec_phys == 0)
|
|
server_panic((*dp->dr_name)(),"bad I/O vector by", mp->m_source);
|
|
iovec_phys = vir2phys(iovec);
|
|
phys_copy(user_iovec_phys, iovec_phys, (phys_bytes) iovec_size);
|
|
#endif
|
|
iov = iovec;
|
|
}
|
|
|
|
/* Prepare for I/O. */
|
|
if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
|
|
|
|
/* Transfer bytes from/to the device. */
|
|
r = (*dp->dr_transfer)(mp->PROC_NR, mp->m_type, mp->POSITION, iov, nr_req);
|
|
|
|
/* Copy the I/O vector back to the caller. */
|
|
if (mp->m_source >= 0) {
|
|
sys_datacopy(SELF, (vir_bytes) iovec,
|
|
mp->m_source, (vir_bytes) mp->ADDRESS, iovec_size);
|
|
#if DEAD_CODE
|
|
phys_copy(iovec_phys, user_iovec_phys, (phys_bytes) iovec_size);
|
|
#endif
|
|
}
|
|
return(r);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* no_name *
|
|
*===========================================================================*/
|
|
PUBLIC char *no_name()
|
|
{
|
|
/* Use this default name if there is no specific name for the device. This was
|
|
* originally done by fetching the name from the task table for this process:
|
|
* "return(tasktab[proc_number(proc_ptr) + NR_TASKS].name);", but currently a
|
|
* real "noname" is returned. Perhaps, some system information service can be
|
|
* queried for a name at a later time.
|
|
*/
|
|
static char name[] = "noname";
|
|
return name;
|
|
}
|
|
|
|
|
|
/*============================================================================*
|
|
* do_nop *
|
|
*============================================================================*/
|
|
PUBLIC int do_nop(dp, mp)
|
|
struct driver *dp;
|
|
message *mp;
|
|
{
|
|
/* Nothing there, or nothing to do. */
|
|
|
|
switch (mp->m_type) {
|
|
case DEV_OPEN: return(ENODEV);
|
|
case DEV_CLOSE: return(OK);
|
|
case DEV_IOCTL: return(ENOTTY);
|
|
default: return(EIO);
|
|
}
|
|
}
|
|
|
|
/*============================================================================*
|
|
* nop_stop *
|
|
*============================================================================*/
|
|
PUBLIC void nop_stop(dp)
|
|
struct driver *dp;
|
|
{
|
|
/* No cleanup needed on shutdown. */
|
|
sys_exit(0);
|
|
}
|
|
|
|
/*============================================================================*
|
|
* nop_alarm *
|
|
*============================================================================*/
|
|
PUBLIC void nop_alarm(dp)
|
|
struct driver *dp;
|
|
{
|
|
/* Ignore the leftover alarm. */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_prepare *
|
|
*===========================================================================*/
|
|
PUBLIC struct device *nop_prepare(device)
|
|
{
|
|
/* Nothing to prepare for. */
|
|
return(NIL_DEV);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_cleanup *
|
|
*===========================================================================*/
|
|
PUBLIC void nop_cleanup()
|
|
{
|
|
/* Nothing to clean up. */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_stats *
|
|
*===========================================================================*/
|
|
PUBLIC void nop_stats(dp, m_ptr)
|
|
struct driver *dp;
|
|
message *m_ptr;
|
|
{
|
|
/* Dump message counts. */
|
|
printf("Driver shared code statistics for %s\n", (*dp->dr_name)());
|
|
printf("DEV_READ %10u\n", dev_read_count);
|
|
printf("DEV_WRITE %10u\n", dev_write_count);
|
|
printf("DEV_GATHER %10u\n", dev_gather_count);
|
|
printf("DEV_SCATTER %10u\n", dev_scatter_count);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_task *
|
|
*===========================================================================*/
|
|
PUBLIC void nop_task()
|
|
{
|
|
/* Unused controllers are "serviced" by this task. */
|
|
struct driver nop_tab = {
|
|
no_name,
|
|
do_nop,
|
|
do_nop,
|
|
do_nop,
|
|
nop_prepare,
|
|
NULL,
|
|
nop_cleanup,
|
|
NULL,
|
|
nop_stop,
|
|
nop_alarm,
|
|
};
|
|
driver_task(&nop_tab);
|
|
}
|
|
|
|
|
|
/*============================================================================*
|
|
* do_diocntl *
|
|
*============================================================================*/
|
|
PUBLIC int do_diocntl(dp, mp)
|
|
struct driver *dp;
|
|
message *mp; /* pointer to ioctl request */
|
|
{
|
|
/* Carry out a partition setting/getting request. */
|
|
struct device *dv;
|
|
phys_bytes user_phys, entry_phys;
|
|
struct partition entry;
|
|
int s;
|
|
|
|
if (mp->REQUEST != DIOCSETP && mp->REQUEST != DIOCGETP) return(ENOTTY);
|
|
|
|
/* Decode the message parameters. */
|
|
if ((dv = (*dp->dr_prepare)(mp->DEVICE)) == NIL_DEV) return(ENXIO);
|
|
|
|
#if DEAD_CODE
|
|
sys_umap(mp->PROC_NR, D, (vir_bytes) mp->ADDRESS, sizeof(entry), &user_phys);
|
|
if (user_phys == 0) return(EFAULT);
|
|
entry_phys = vir2phys(&entry);
|
|
#endif
|
|
|
|
if (mp->REQUEST == DIOCSETP) {
|
|
/* Copy just this one partition table entry. */
|
|
#if DEAD_CODE
|
|
phys_copy(user_phys, entry_phys, (phys_bytes) sizeof(entry));
|
|
#endif
|
|
if (OK != (s=sys_datacopy(mp->PROC_NR, (vir_bytes) mp->ADDRESS,
|
|
SELF, (vir_bytes) &entry, sizeof(entry))))
|
|
return s;
|
|
dv->dv_base = entry.base;
|
|
dv->dv_size = entry.size;
|
|
} else {
|
|
/* Return a partition table entry and the geometry of the drive. */
|
|
entry.base = dv->dv_base;
|
|
entry.size = dv->dv_size;
|
|
(*dp->dr_geometry)(&entry);
|
|
#if DEAD_CODE
|
|
phys_copy(entry_phys, user_phys, (phys_bytes) sizeof(entry));
|
|
#endif
|
|
if (OK != (s=sys_datacopy(SELF, (vir_bytes) &entry,
|
|
mp->PROC_NR, (vir_bytes) mp->ADDRESS, sizeof(entry))))
|
|
return s;
|
|
}
|
|
return(OK);
|
|
}
|