377 lines
12 KiB
C
377 lines
12 KiB
C
/* This file contains device independent device driver interface.
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*
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* Changes:
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* Jul 25, 2005 added SYS_SIG type for signals (Jorrit N. Herder)
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* Sep 15, 2004 added SYN_ALARM type for timeouts (Jorrit N. Herder)
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* Jul 23, 2004 removed kernel dependencies (Jorrit N. Herder)
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* Apr 02, 1992 constructed from AT wini and floppy driver (Kees J. Bot)
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*
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*
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* The drivers support the following operations (using message format m2):
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*
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* m_type DEVICE PROC_NR COUNT POSITION ADRRESS
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* ----------------------------------------------------------------
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* | DEV_OPEN | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_CLOSE | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_READ | device | proc nr | bytes | offset | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_WRITE | device | proc nr | bytes | offset | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_GATHER | device | proc nr | iov len | offset | iov ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_SCATTER| device | proc nr | iov len | offset | iov ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_IOCTL | device | proc nr |func code| | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | CANCEL | device | proc nr | r/w | | |
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* |------------+---------+---------+---------+---------+---------|
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* | HARD_STOP | | | | | |
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* ----------------------------------------------------------------
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*
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* The file contains one entry point:
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*
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* driver_task: called by the device dependent task entry
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*/
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#include "../drivers.h"
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#include <sys/ioc_disk.h>
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#include "driver.h"
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#if (CHIP == INTEL)
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#if USE_EXTRA_DMA_BUF && DMA_BUF_SIZE < 2048
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/* A bit extra scratch for the Adaptec driver. */
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#define BUF_EXTRA (2048 - DMA_BUF_SIZE)
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#else
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#define BUF_EXTRA 0
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#endif
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/* Claim space for variables. */
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PRIVATE u8_t buffer[(unsigned) 2 * DMA_BUF_SIZE + BUF_EXTRA];
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u8_t *tmp_buf; /* the DMA buffer eventually */
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phys_bytes tmp_phys; /* phys address of DMA buffer */
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#else /* CHIP != INTEL */
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/* Claim space for variables. */
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u8_t tmp_buf[DMA_BUF_SIZE]; /* the DMA buffer */
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phys_bytes tmp_phys; /* phys address of DMA buffer */
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#endif /* CHIP != INTEL */
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FORWARD _PROTOTYPE( void init_buffer, (void) );
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FORWARD _PROTOTYPE( int do_rdwt, (struct driver *dr, message *mp) );
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FORWARD _PROTOTYPE( int do_vrdwt, (struct driver *dr, message *mp) );
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int device_caller;
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/*===========================================================================*
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* driver_task *
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*===========================================================================*/
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PUBLIC void driver_task(dp)
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struct driver *dp; /* Device dependent entry points. */
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{
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/* Main program of any device driver task. */
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int r, proc_nr;
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message mess;
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int s;
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/* Get a DMA buffer. */
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init_buffer();
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/* Here is the main loop of the disk task. It waits for a message, carries
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* it out, and sends a reply.
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*/
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while (TRUE) {
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/* Wait for a request to read or write a disk block. */
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receive(ANY, &mess);
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device_caller = mess.m_source;
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proc_nr = mess.PROC_NR;
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/* Now carry out the work. */
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switch(mess.m_type) {
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case DEV_OPEN: r = (*dp->dr_open)(dp, &mess); break;
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case DEV_CLOSE: r = (*dp->dr_close)(dp, &mess); break;
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case DEV_IOCTL: r = (*dp->dr_ioctl)(dp, &mess); break;
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case CANCEL: r = (*dp->dr_cancel)(dp, &mess);break;
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case DEV_SELECT: r = (*dp->dr_select)(dp, &mess);break;
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case DEV_READ:
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case DEV_WRITE: r = do_rdwt(dp, &mess); break;
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case DEV_GATHER:
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case DEV_SCATTER: r = do_vrdwt(dp, &mess); break;
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case HARD_INT: /* leftover interrupt or expired timer. */
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continue;
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case SYS_SIG: (*dp->dr_signal)(dp, &mess);
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continue; /* don't reply */
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case SYN_ALARM: (*dp->dr_alarm)(dp, &mess);
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continue; /* don't reply */
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default:
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if(dp->dr_other)
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r = (*dp->dr_other)(dp, &mess);
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else
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r = EINVAL;
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break;
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}
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/* Clean up leftover state. */
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(*dp->dr_cleanup)();
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/* Finally, prepare and send the reply message. */
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if (r != EDONTREPLY) {
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mess.m_type = TASK_REPLY;
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mess.REP_PROC_NR = proc_nr;
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/* Status is # of bytes transferred or error code. */
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mess.REP_STATUS = r;
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send(device_caller, &mess);
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}
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}
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}
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/*===========================================================================*
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* init_buffer *
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*===========================================================================*/
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PRIVATE void init_buffer()
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{
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/* Select a buffer that can safely be used for DMA transfers. It may also
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* be used to read partition tables and such. Its absolute address is
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* 'tmp_phys', the normal address is 'tmp_buf'.
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*/
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#if (CHIP == INTEL)
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unsigned left;
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tmp_buf = buffer;
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sys_umap(SELF, D, (vir_bytes)buffer, (phys_bytes)sizeof(buffer), &tmp_phys);
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if ((left = dma_bytes_left(tmp_phys)) < DMA_BUF_SIZE) {
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/* First half of buffer crosses a 64K boundary, can't DMA into that */
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tmp_buf += left;
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tmp_phys += left;
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}
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#endif /* CHIP == INTEL */
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}
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/*===========================================================================*
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* do_rdwt *
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*===========================================================================*/
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PRIVATE int do_rdwt(dp, mp)
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struct driver *dp; /* device dependent entry points */
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message *mp; /* pointer to read or write message */
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{
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/* Carry out a single read or write request. */
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iovec_t iovec1;
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int r, opcode;
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phys_bytes phys_addr;
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/* Disk address? Address and length of the user buffer? */
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if (mp->COUNT < 0) return(EINVAL);
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/* Check the user buffer. */
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sys_umap(mp->PROC_NR, D, (vir_bytes) mp->ADDRESS, mp->COUNT, &phys_addr);
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if (phys_addr == 0) return(EFAULT);
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/* Prepare for I/O. */
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if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
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/* Create a one element scatter/gather vector for the buffer. */
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opcode = mp->m_type == DEV_READ ? DEV_GATHER : DEV_SCATTER;
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iovec1.iov_addr = (vir_bytes) mp->ADDRESS;
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iovec1.iov_size = mp->COUNT;
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/* Transfer bytes from/to the device. */
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r = (*dp->dr_transfer)(mp->PROC_NR, opcode, mp->POSITION, &iovec1, 1);
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/* Return the number of bytes transferred or an error code. */
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return(r == OK ? (mp->COUNT - iovec1.iov_size) : r);
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}
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/*==========================================================================*
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* do_vrdwt *
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*==========================================================================*/
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PRIVATE int do_vrdwt(dp, mp)
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struct driver *dp; /* device dependent entry points */
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message *mp; /* pointer to read or write message */
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{
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/* Carry out an device read or write to/from a vector of user addresses.
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* The "user addresses" are assumed to be safe, i.e. FS transferring to/from
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* its own buffers, so they are not checked.
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*/
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static iovec_t iovec[NR_IOREQS];
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iovec_t *iov;
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phys_bytes iovec_phys, user_iovec_phys;
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phys_bytes iovec_size;
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unsigned nr_req;
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int r;
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nr_req = mp->COUNT; /* Length of I/O vector */
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if (mp->m_source < 0) {
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/* Called by a task, no need to copy vector. */
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iov = (iovec_t *) mp->ADDRESS;
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} else {
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/* Copy the vector from the caller to kernel space. */
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if (nr_req > NR_IOREQS) nr_req = NR_IOREQS;
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iovec_size = (phys_bytes) (nr_req * sizeof(iovec[0]));
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if (OK != sys_datacopy(mp->m_source, (vir_bytes) mp->ADDRESS,
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SELF, (vir_bytes) iovec, iovec_size))
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panic((*dp->dr_name)(),"bad I/O vector by", mp->m_source);
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iov = iovec;
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}
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/* Prepare for I/O. */
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if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
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/* Transfer bytes from/to the device. */
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r = (*dp->dr_transfer)(mp->PROC_NR, mp->m_type, mp->POSITION, iov, nr_req);
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/* Copy the I/O vector back to the caller. */
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if (mp->m_source >= 0) {
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sys_datacopy(SELF, (vir_bytes) iovec,
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mp->m_source, (vir_bytes) mp->ADDRESS, iovec_size);
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}
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return(r);
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}
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/*===========================================================================*
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* no_name *
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*===========================================================================*/
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PUBLIC char *no_name()
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{
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/* Use this default name if there is no specific name for the device. This was
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* originally done by fetching the name from the task table for this process:
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* "return(tasktab[proc_number(proc_ptr) + NR_TASKS].name);", but currently a
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* real "noname" is returned. Perhaps, some system information service can be
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* queried for a name at a later time.
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*/
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static char name[] = "noname";
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return name;
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}
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/*============================================================================*
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* do_nop *
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*============================================================================*/
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PUBLIC int do_nop(dp, mp)
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struct driver *dp;
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message *mp;
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{
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/* Nothing there, or nothing to do. */
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switch (mp->m_type) {
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case DEV_OPEN: return(ENODEV);
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case DEV_CLOSE: return(OK);
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case DEV_IOCTL: return(ENOTTY);
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default: return(EIO);
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}
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}
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/*============================================================================*
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* nop_signal *
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*============================================================================*/
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PUBLIC void nop_signal(dp, mp)
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struct driver *dp;
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message *mp;
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{
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/* Default action for signal is to ignore. */
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}
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/*============================================================================*
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* nop_alarm *
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*============================================================================*/
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PUBLIC void nop_alarm(dp, mp)
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struct driver *dp;
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message *mp;
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{
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/* Ignore the leftover alarm. */
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}
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/*===========================================================================*
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* nop_prepare *
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*===========================================================================*/
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PUBLIC struct device *nop_prepare(device)
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{
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/* Nothing to prepare for. */
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return(NIL_DEV);
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}
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/*===========================================================================*
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* nop_cleanup *
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*===========================================================================*/
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PUBLIC void nop_cleanup()
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{
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/* Nothing to clean up. */
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}
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/*===========================================================================*
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* nop_cancel *
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*===========================================================================*/
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PUBLIC int nop_cancel(struct driver *dr, message *m)
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{
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/* Nothing to do for cancel. */
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}
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/*===========================================================================*
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* nop_select *
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*===========================================================================*/
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PUBLIC int nop_select(struct driver *dr, message *m)
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{
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/* Nothing to do for select. */
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}
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/*============================================================================*
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* do_diocntl *
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*============================================================================*/
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PUBLIC int do_diocntl(dp, mp)
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struct driver *dp;
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message *mp; /* pointer to ioctl request */
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{
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/* Carry out a partition setting/getting request. */
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struct device *dv;
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phys_bytes user_phys, entry_phys;
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struct partition entry;
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int s;
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if (mp->REQUEST != DIOCSETP && mp->REQUEST != DIOCGETP) {
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if(dp->dr_other) {
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return dp->dr_other(dp, mp);
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} else return(ENOTTY);
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}
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/* Decode the message parameters. */
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if ((dv = (*dp->dr_prepare)(mp->DEVICE)) == NIL_DEV) return(ENXIO);
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if (mp->REQUEST == DIOCSETP) {
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/* Copy just this one partition table entry. */
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if (OK != (s=sys_datacopy(mp->PROC_NR, (vir_bytes) mp->ADDRESS,
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SELF, (vir_bytes) &entry, sizeof(entry))))
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return s;
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dv->dv_base = entry.base;
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dv->dv_size = entry.size;
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} else {
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/* Return a partition table entry and the geometry of the drive. */
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entry.base = dv->dv_base;
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entry.size = dv->dv_size;
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(*dp->dr_geometry)(&entry);
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if (OK != (s=sys_datacopy(SELF, (vir_bytes) &entry,
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mp->PROC_NR, (vir_bytes) mp->ADDRESS, sizeof(entry))))
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return s;
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}
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return(OK);
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}
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