--- /dev/null
+/* This file contains device independent device driver interface.
+ *
+ * Changes:
+ * Jul 25, 2005 added SYS_SIG type for signals (Jorrit N. Herder)
+ * Sep 15, 2004 added SYN_ALARM type for timeouts (Jorrit N. Herder)
+ * Jul 23, 2004 removed kernel dependencies (Jorrit N. Herder)
+ * Apr 02, 1992 constructed from AT wini and floppy driver (Kees J. Bot)
+ *
+ *
+ * The drivers support the following operations (using message format m2):
+ *
+ * m_type DEVICE IO_ENDPT 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 |
+ * |------------+---------+---------+---------+---------+---------|
+ * | CANCEL | device | proc nr | r/w | | |
+ * |------------+---------+---------+---------+---------+---------|
+ * | HARD_STOP | | | | | |
+ * |------------+---------+---------+---------+---------+---------|
+ * | DEV_*_S | variants using safecopies of above |
+ * ----------------------------------------------------------------
+ *
+ * The file contains one entry point:
+ *
+ * driver_task: called by the device dependent task entry
+ */
+
+
+#include "../drivers.h"
+#include <sys/ioc_disk.h>
+#include <minix/mq.h>
+#include "driver.h"
+
+#if (CHIP == INTEL)
+
+#if USE_EXTRA_DMA_BUF && 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, int safe) );
+FORWARD _PROTOTYPE( int do_vrdwt, (struct driver *dr, message *mp, int safe) );
+
+_PROTOTYPE( int asynsend, (endpoint_t dst, message *mp));
+
+int device_caller;
+PRIVATE mq_t *queue_head = NULL;
+
+/*===========================================================================*
+ * driver_task *
+ *===========================================================================*/
+PUBLIC void driver_task(dp)
+struct driver *dp; /* Device dependent entry points. */
+{
+/* Main program of any device driver task. */
+
+ int r, proc_nr;
+ message mess, reply_mess;
+
+ /* Init MQ library. */
+ mq_init();
+
+ /* 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) {
+ /* Any queued messages? Oldest are at the head. */
+ if(queue_head) {
+ mq_t *mq;
+ mq = queue_head;
+ memcpy(&mess, &mq->mq_mess, sizeof(mess));
+ queue_head = queue_head->mq_next;
+ mq_free(mq);
+ } else {
+ int s;
+ /* Wait for a request to read or write a disk block. */
+ if ((s=receive(ANY, &mess)) != OK)
+ panic((*dp->dr_name)(),"receive() failed", s);
+ }
+
+ device_caller = mess.m_source;
+ proc_nr = mess.IO_ENDPT;
+
+ if (mess.m_type != SYN_ALARM && mess.m_type != DEV_PING &&
+ mess.m_type != 4105 /* notify from TTY */ &&
+ mess.m_type != DEV_SELECT &&
+ mess.m_type != DEV_READ_S &&
+ mess.m_type != DIAGNOSTICS_S &&
+ mess.m_type != CANCEL)
+ {
+ printf("libdriver_asyn`driver_task: message %d\n",
+ mess.m_type);
+ }
+
+ if (mess.m_type == DEV_SELECT)
+ {
+ static int first= 1;
+ if (first)
+ {
+ first= 0;
+ printf(
+ "libdriver_asyn`driver_task: first DEV_SELECT: minor 0x%x, ops 0x%x\n",
+ mess.DEVICE, mess.IO_ENDPT);
+ }
+ }
+
+ /* 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;
+#ifdef DEV_IOCTL
+ case DEV_IOCTL: r = (*dp->dr_ioctl)(dp, &mess, 0); break;
+#endif
+ case DEV_IOCTL_S: r = (*dp->dr_ioctl)(dp, &mess, 1); break;
+ case CANCEL: r = (*dp->dr_cancel)(dp, &mess);break;
+ case DEV_SELECT: r = (*dp->dr_select)(dp, &mess);break;
+#ifdef DEV_READ
+ case DEV_READ:
+ case DEV_WRITE: r = do_rdwt(dp, &mess, 0); break;
+#endif
+ case DEV_READ_S:
+ case DEV_WRITE_S: r = do_rdwt(dp, &mess, 1); break;
+#ifdef DEV_GATHER
+ case DEV_GATHER:
+ case DEV_SCATTER: r = do_vrdwt(dp, &mess, 0); break;
+#endif
+ case DEV_GATHER_S:
+ case DEV_SCATTER_S: r = do_vrdwt(dp, &mess, 1); break;
+
+ case HARD_INT: /* leftover interrupt or expired timer. */
+ if(dp->dr_hw_int) {
+ (*dp->dr_hw_int)(dp, &mess);
+ }
+ continue;
+ case PROC_EVENT:
+ case SYS_SIG: (*dp->dr_signal)(dp, &mess);
+ continue; /* don't reply */
+ case SYN_ALARM: (*dp->dr_alarm)(dp, &mess);
+ continue; /* don't reply */
+ case DEV_PING: notify(mess.m_source);
+ continue;
+ default:
+ if(dp->dr_other)
+ r = (*dp->dr_other)(dp, &mess, 0);
+ else
+ r = EINVAL;
+ break;
+ }
+
+ /* Clean up leftover state. */
+ (*dp->dr_cleanup)();
+
+ /* Finally, prepare and send the reply message. */
+ if (r != EDONTREPLY) {
+ if (mess.m_type == DEV_OPEN)
+ {
+ reply_mess.m_type = DEV_REVIVE;
+ reply_mess.REP_ENDPT = proc_nr;
+ reply_mess.REP_STATUS = r;
+ }
+ else if (mess.m_type == DEV_CLOSE)
+ {
+ reply_mess.m_type = DEV_CLOSE_REPL;
+ reply_mess.REP_ENDPT = proc_nr;
+ reply_mess.REP_STATUS = r;
+ }
+ else if (mess.m_type == DEV_READ_S ||
+ mess.m_type == DEV_WRITE_S)
+ {
+ if (r == SUSPEND)
+ {
+ printf(
+ "driver_task: reviving %d with SUSPEND\n",
+ proc_nr);
+ }
+ reply_mess.m_type = DEV_REVIVE;
+ reply_mess.REP_ENDPT = proc_nr;
+ reply_mess.REP_IO_GRANT = (cp_grant_id_t)mess.ADDRESS;
+ reply_mess.REP_STATUS = r;
+ }
+ else if (mess.m_type == CANCEL)
+ {
+ continue; /* The original request should send a
+ * reply.
+ */
+ }
+ else if (mess.m_type == DEV_SELECT)
+ {
+ reply_mess.m_type = DEV_SEL_REPL1;
+ reply_mess.DEV_MINOR = mess.DEVICE;
+ reply_mess.DEV_SEL_OPS = r;
+ }
+ else if (mess.m_type == DIAGNOSTICS_S)
+ {
+ if (device_caller == FS_PROC_NR)
+ printf("driver_task: sending DIAG_REPL to FS\n");
+ reply_mess.m_type = DIAG_REPL;
+ reply_mess.REP_STATUS = r;
+ }
+ else
+ {
+ printf("driver_task: TASK_REPLY to req %d\n",
+ mess.m_type);
+ reply_mess.m_type = TASK_REPLY;
+ reply_mess.REP_ENDPT = proc_nr;
+ /* Status is # of bytes transferred or error code. */
+ reply_mess.REP_STATUS = r;
+ }
+ r= asynsend(device_caller, &reply_mess);
+ if (r != OK)
+ {
+ printf("driver_task: unable to asynsend to %d: %d\n",
+ device_caller, r);
+ }
+ }
+ }
+}
+
+
+/*===========================================================================*
+ * 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;
+ }
+#endif /* CHIP == INTEL */
+}
+
+/*===========================================================================*
+ * do_rdwt *
+ *===========================================================================*/
+PRIVATE int do_rdwt(dp, mp, safe)
+struct driver *dp; /* device dependent entry points */
+message *mp; /* pointer to read or write message */
+int safe; /* use safecopies? */
+{
+/* Carry out a single read or write request. */
+ iovec_t iovec1;
+ int r, opcode;
+ phys_bytes phys_addr;
+ u64_t position;
+
+ /* Disk address? Address and length of the user buffer? */
+ if (mp->COUNT < 0) return(EINVAL);
+
+ /* Check the user buffer (not relevant for safe copies). */
+ if(!safe) {
+ sys_umap(mp->IO_ENDPT, 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. */
+ if(
+#ifdef DEV_READ
+ mp->m_type == DEV_READ ||
+#endif
+ mp->m_type == DEV_READ_S) opcode = DEV_GATHER_S;
+ else opcode = DEV_SCATTER_S;
+
+ iovec1.iov_addr = (vir_bytes) mp->ADDRESS;
+ iovec1.iov_size = mp->COUNT;
+
+ /* Transfer bytes from/to the device. */
+ position= make64(mp->POSITION, mp->HIGHPOS);
+ r = (*dp->dr_transfer)(mp->IO_ENDPT, opcode, position, &iovec1, 1, safe);
+
+ /* 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, safe)
+struct driver *dp; /* device dependent entry points */
+message *mp; /* pointer to read or write message */
+int safe; /* use safecopies? */
+{
+/* 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_size;
+ unsigned nr_req;
+ int r, j, opcode;
+ u64_t position;
+
+ nr_req = mp->COUNT; /* Length of I/O vector */
+
+ {
+ /* 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(safe) {
+ if (OK != sys_safecopyfrom(mp->m_source, (vir_bytes) mp->IO_GRANT,
+ 0, (vir_bytes) iovec, iovec_size, D)) {
+ panic((*dp->dr_name)(),"bad (safe) I/O vector by", mp->m_source);
+ }
+ } else {
+ if (OK != sys_datacopy(mp->m_source, (vir_bytes) mp->ADDRESS,
+ SELF, (vir_bytes) iovec, iovec_size)) {
+ panic((*dp->dr_name)(),"bad I/O vector by", mp->m_source);
+ }
+ }
+
+ iov = iovec;
+ }
+
+ /* Prepare for I/O. */
+ if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
+
+ /* Transfer bytes from/to the device. */
+ opcode = mp->m_type;
+ position= make64(mp->POSITION, mp->HIGHPOS);
+ r = (*dp->dr_transfer)(mp->IO_ENDPT, opcode, position, iov,
+ nr_req, safe);
+
+ /* Copy the I/O vector back to the caller. */
+ if(safe) {
+ if (OK != sys_safecopyto(mp->m_source, (vir_bytes) mp->IO_GRANT,
+ 0, (vir_bytes) iovec, iovec_size, D)) {
+ panic((*dp->dr_name)(),"couldn't return I/O vector", mp->m_source);
+ }
+ } else {
+ sys_datacopy(SELF, (vir_bytes) iovec,
+ mp->m_source, (vir_bytes) mp->ADDRESS, iovec_size);
+ }
+
+ 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_S:
+#ifdef DEV_IOCTL
+ case DEV_IOCTL: return(ENOTTY);
+#endif
+ default: printf("nop: ignoring code %d\n", mp->m_type); return(EIO);
+ }
+}
+
+/*============================================================================*
+ * nop_ioctl *
+ *============================================================================*/
+PUBLIC int nop_ioctl(dp, mp, safe)
+struct driver *dp;
+message *mp;
+int safe;
+{
+ return(ENOTTY);
+}
+
+/*============================================================================*
+ * nop_signal *
+ *============================================================================*/
+PUBLIC void nop_signal(dp, mp)
+struct driver *dp;
+message *mp;
+{
+/* Default action for signal is to ignore. */
+}
+
+/*============================================================================*
+ * nop_alarm *
+ *============================================================================*/
+PUBLIC void nop_alarm(dp, mp)
+struct driver *dp;
+message *mp;
+{
+/* 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_cancel *
+ *===========================================================================*/
+PUBLIC int nop_cancel(struct driver *dr, message *m)
+{
+/* Nothing to do for cancel. */
+ return(OK);
+}
+
+/*===========================================================================*
+ * nop_select *
+ *===========================================================================*/
+PUBLIC int nop_select(struct driver *dr, message *m)
+{
+/* Nothing to do for select. */
+ return(OK);
+}
+
+/*============================================================================*
+ * do_diocntl *
+ *============================================================================*/
+PUBLIC int do_diocntl(dp, mp, safe)
+struct driver *dp;
+message *mp; /* pointer to ioctl request */
+int safe; /* addresses or grants? */
+{
+/* Carry out a partition setting/getting request. */
+ struct device *dv;
+ struct partition entry;
+ int s;
+
+ if (mp->REQUEST != DIOCSETP && mp->REQUEST != DIOCGETP) {
+ if(dp->dr_other) {
+ return dp->dr_other(dp, mp, safe);
+ } else return(ENOTTY);
+ }
+
+ /* Decode the message parameters. */
+ if ((dv = (*dp->dr_prepare)(mp->DEVICE)) == NIL_DEV) return(ENXIO);
+
+ if (mp->REQUEST == DIOCSETP) {
+ /* Copy just this one partition table entry. */
+ if(safe) {
+ s=sys_safecopyfrom(mp->IO_ENDPT, (vir_bytes) mp->IO_GRANT,
+ 0, (vir_bytes) &entry, sizeof(entry), D);
+ } else{
+ s=sys_datacopy(mp->IO_ENDPT, (vir_bytes) mp->ADDRESS,
+ SELF, (vir_bytes) &entry, sizeof(entry));
+ }
+ if(s != OK)
+ 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(safe) {
+ s=sys_safecopyto(mp->IO_ENDPT, (vir_bytes) mp->IO_GRANT,
+ 0, (vir_bytes) &entry, sizeof(entry), D);
+ } else {
+ s=sys_datacopy(SELF, (vir_bytes) &entry,
+ mp->IO_ENDPT, (vir_bytes) mp->ADDRESS, sizeof(entry));
+ }
+ if (OK != s)
+ return s;
+ }
+ return(OK);
+}
+
+/*===========================================================================*
+ * mq_queue *
+ *===========================================================================*/
+PUBLIC int mq_queue(message *m)
+{
+ mq_t *mq, *mi;
+
+ if(!(mq = mq_get()))
+ panic("libdriver","mq_queue: mq_get failed", NO_NUM);
+ memcpy(&mq->mq_mess, m, sizeof(mq->mq_mess));
+ mq->mq_next = NULL;
+ if(!queue_head) {
+ queue_head = mq;
+ } else {
+ for(mi = queue_head; mi->mq_next; mi = mi->mq_next)
+ ;
+ mi->mq_next = mq;
+ }
+
+ return OK;
+}
+
+#define ASYN_NR 100
+PRIVATE asynmsg_t msgtable[ASYN_NR];
+PRIVATE int first_slot= 0, next_slot= 0;
+
+PUBLIC int asynsend(dst, mp)
+endpoint_t dst;
+message *mp;
+{
+ int r, src_ind, dst_ind;
+ unsigned flags;
+
+ /* Update first_slot */
+ for (; first_slot < next_slot; first_slot++)
+ {
+ flags= msgtable[first_slot].flags;
+ if ((flags & (AMF_VALID|AMF_DONE)) == (AMF_VALID|AMF_DONE))
+ {
+ if (msgtable[first_slot].result != OK)
+ {
+ printf(
+ "asynsend: found completed entry %d with error %d\n",
+ first_slot,
+ msgtable[first_slot].result);
+ }
+ continue;
+ }
+ if (flags != AMF_EMPTY)
+ break;
+ }
+
+ if (first_slot >= next_slot)
+ {
+ /* Reset first_slot and next_slot */
+ next_slot= first_slot= 0;
+ }
+
+ if (next_slot >= ASYN_NR)
+ {
+ /* Tell the kernel to stop processing */
+ r= senda(NULL, 0);
+ if (r != OK)
+ panic(__FILE__, "asynsend: senda failed", r);
+
+ dst_ind= 0;
+ for (src_ind= first_slot; src_ind<next_slot; src_ind++)
+ {
+ flags= msgtable[src_ind].flags;
+ if ((flags & (AMF_VALID|AMF_DONE)) ==
+ (AMF_VALID|AMF_DONE))
+ {
+ if (msgtable[src_ind].result != OK)
+ {
+ printf(
+ "asynsend: found completed entry %d with error %d\n",
+ src_ind,
+ msgtable[src_ind].result);
+ }
+ continue;
+ }
+ if (flags == AMF_EMPTY)
+ continue;
+#if 0
+ printf("asynsend: copying entry %d to %d\n",
+ src_ind, dst_ind);
+#endif
+ if (src_ind != dst_ind)
+ msgtable[dst_ind]= msgtable[src_ind];
+ dst_ind++;
+ }
+ first_slot= 0;
+ next_slot= dst_ind;
+ if (next_slot >= ASYN_NR)
+ panic(__FILE__, "asynsend: msgtable full", NO_NUM);
+ }
+
+ msgtable[next_slot].dst= dst;
+ msgtable[next_slot].msg= *mp;
+ msgtable[next_slot].flags= AMF_VALID; /* Has to be last. The kernel
+ * scans this table while we
+ * are sleeping.
+ */
+ next_slot++;
+
+ /* Tell the kernel to rescan the table */
+ return senda(msgtable+first_slot, next_slot-first_slot);
+}
+
--- /dev/null
+/* Types and constants shared between the generic and device dependent
+ * device driver code.
+ */
+
+#define _POSIX_SOURCE 1 /* tell headers to include POSIX stuff */
+#define _MINIX 1 /* tell headers to include MINIX stuff */
+#define _SYSTEM 1 /* get negative error number in <errno.h> */
+
+/* The following are so basic, all the *.c files get them automatically. */
+#include <minix/config.h> /* MUST be first */
+#include <ansi.h> /* MUST be second */
+#include <minix/type.h>
+#include <minix/ipc.h>
+#include <minix/com.h>
+#include <minix/callnr.h>
+#include <sys/types.h>
+#include <minix/const.h>
+#include <minix/syslib.h>
+#include <minix/sysutil.h>
+
+#include <string.h>
+#include <limits.h>
+#include <stddef.h>
+#include <errno.h>
+
+#include <minix/partition.h>
+#include <minix/u64.h>
+
+/* Info about and entry points into the device dependent code. */
+struct driver {
+ _PROTOTYPE( char *(*dr_name), (void) );
+ _PROTOTYPE( int (*dr_open), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( int (*dr_close), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( int (*dr_ioctl), (struct driver *dp, message *m_ptr, int safe) );
+ _PROTOTYPE( struct device *(*dr_prepare), (int device) );
+ _PROTOTYPE( int (*dr_transfer), (int proc_nr, int opcode, u64_t position,
+ iovec_t *iov, unsigned nr_req, int safe) );
+ _PROTOTYPE( void (*dr_cleanup), (void) );
+ _PROTOTYPE( void (*dr_geometry), (struct partition *entry) );
+ _PROTOTYPE( void (*dr_signal), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( void (*dr_alarm), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( int (*dr_cancel), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( int (*dr_select), (struct driver *dp, message *m_ptr) );
+ _PROTOTYPE( int (*dr_other), (struct driver *dp, message *m_ptr, int safe) );
+ _PROTOTYPE( int (*dr_hw_int), (struct driver *dp, message *m_ptr) );
+};
+
+#if (CHIP == INTEL)
+
+/* Number of bytes you can DMA before hitting a 64K boundary: */
+#define dma_bytes_left(phys) \
+ ((unsigned) (sizeof(int) == 2 ? 0 : 0x10000) - (unsigned) ((phys) & 0xFFFF))
+
+#endif /* CHIP == INTEL */
+
+/* Base and size of a partition in bytes. */
+struct device {
+ u64_t dv_base;
+ u64_t dv_size;
+};
+
+#define NIL_DEV ((struct device *) 0)
+
+/* Functions defined by driver.c: */
+_PROTOTYPE( void driver_task, (struct driver *dr) );
+_PROTOTYPE( char *no_name, (void) );
+_PROTOTYPE( int do_nop, (struct driver *dp, message *m_ptr) );
+_PROTOTYPE( struct device *nop_prepare, (int device) );
+_PROTOTYPE( void nop_cleanup, (void) );
+_PROTOTYPE( void nop_task, (void) );
+_PROTOTYPE( void nop_signal, (struct driver *dp, message *m_ptr) );
+_PROTOTYPE( void nop_alarm, (struct driver *dp, message *m_ptr) );
+_PROTOTYPE( int nop_cancel, (struct driver *dp, message *m_ptr) );
+_PROTOTYPE( int nop_select, (struct driver *dp, message *m_ptr) );
+_PROTOTYPE( int do_diocntl, (struct driver *dp, message *m_ptr, int safe) );
+_PROTOTYPE( int nop_ioctl, (struct driver *dp, message *m_ptr, int safe) );
+_PROTOTYPE( int mq_queue, (message *m_ptr) );
+
+/* Parameters for the disk drive. */
+#define SECTOR_SIZE 512 /* physical sector size in bytes */
+#define SECTOR_SHIFT 9 /* for division */
+#define SECTOR_MASK 511 /* and remainder */
+
+/* Size of the DMA buffer buffer in bytes. */
+#define USE_EXTRA_DMA_BUF 0 /* usually not needed */
+#define DMA_BUF_SIZE (DMA_SECTORS * SECTOR_SIZE)
+
+#if (CHIP == INTEL)
+extern u8_t *tmp_buf; /* the DMA buffer */
+#else
+extern u8_t tmp_buf[]; /* the DMA buffer */
+#endif
+extern phys_bytes tmp_phys; /* phys address of DMA buffer */
--- /dev/null
+/* IBM device driver utility functions. Author: Kees J. Bot
+ * 7 Dec 1995
+ * Entry point:
+ * partition: partition a disk to the partition table(s) on it.
+ */
+
+#include "driver.h"
+#include "drvlib.h"
+#include <unistd.h>
+
+/* Extended partition? */
+#define ext_part(s) ((s) == 0x05 || (s) == 0x0F)
+
+FORWARD _PROTOTYPE( void extpartition, (struct driver *dp, int extdev,
+ unsigned long extbase) );
+FORWARD _PROTOTYPE( int get_part_table, (struct driver *dp, int device,
+ unsigned long offset, struct part_entry *table));
+FORWARD _PROTOTYPE( void sort, (struct part_entry *table) );
+
+#ifndef CD_SECTOR_SIZE
+#define CD_SECTOR_SIZE 2048
+#endif
+
+/*============================================================================*
+ * partition *
+ *============================================================================*/
+PUBLIC void partition(dp, device, style, atapi)
+struct driver *dp; /* device dependent entry points */
+int device; /* device to partition */
+int style; /* partitioning style: floppy, primary, sub. */
+int atapi; /* atapi device */
+{
+/* This routine is called on first open to initialize the partition tables
+ * of a device. It makes sure that each partition falls safely within the
+ * device's limits. Depending on the partition style we are either making
+ * floppy partitions, primary partitions or subpartitions. Only primary
+ * partitions are sorted, because they are shared with other operating
+ * systems that expect this.
+ */
+ struct part_entry table[NR_PARTITIONS], *pe;
+ int disk, par;
+ struct device *dv;
+ unsigned long base, limit, part_limit;
+
+ /* Get the geometry of the device to partition */
+ if ((dv = (*dp->dr_prepare)(device)) == NIL_DEV
+ || cmp64u(dv->dv_size, 0) == 0) return;
+ base = div64u(dv->dv_base, SECTOR_SIZE);
+ limit = base + div64u(dv->dv_size, SECTOR_SIZE);
+
+ /* Read the partition table for the device. */
+ if(!get_part_table(dp, device, 0L, table)) {
+ return;
+ }
+
+ /* Compute the device number of the first partition. */
+ switch (style) {
+ case P_FLOPPY:
+ device += MINOR_fd0p0;
+ break;
+ case P_PRIMARY:
+ sort(table); /* sort a primary partition table */
+ device += 1;
+ break;
+ case P_SUB:
+ disk = device / DEV_PER_DRIVE;
+ par = device % DEV_PER_DRIVE - 1;
+ device = MINOR_d0p0s0 + (disk * NR_PARTITIONS + par) * NR_PARTITIONS;
+ }
+
+ /* Find an array of devices. */
+ if ((dv = (*dp->dr_prepare)(device)) == NIL_DEV) return;
+
+ /* Set the geometry of the partitions from the partition table. */
+ for (par = 0; par < NR_PARTITIONS; par++, dv++) {
+ /* Shrink the partition to fit within the device. */
+ pe = &table[par];
+ part_limit = pe->lowsec + pe->size;
+ if (part_limit < pe->lowsec) part_limit = limit;
+ if (part_limit > limit) part_limit = limit;
+ if (pe->lowsec < base) pe->lowsec = base;
+ if (part_limit < pe->lowsec) part_limit = pe->lowsec;
+
+ dv->dv_base = mul64u(pe->lowsec, SECTOR_SIZE);
+ dv->dv_size = mul64u(part_limit - pe->lowsec, SECTOR_SIZE);
+
+ if (style == P_PRIMARY) {
+ /* Each Minix primary partition can be subpartitioned. */
+ if (pe->sysind == MINIX_PART)
+ partition(dp, device + par, P_SUB, atapi);
+
+ /* An extended partition has logical partitions. */
+ if (ext_part(pe->sysind))
+ extpartition(dp, device + par, pe->lowsec);
+ }
+ }
+}
+
+/*============================================================================*
+ * extpartition *
+ *============================================================================*/
+PRIVATE void extpartition(dp, extdev, extbase)
+struct driver *dp; /* device dependent entry points */
+int extdev; /* extended partition to scan */
+unsigned long extbase; /* sector offset of the base extended partition */
+{
+/* Extended partitions cannot be ignored alas, because people like to move
+ * files to and from DOS partitions. Avoid reading this code, it's no fun.
+ */
+ struct part_entry table[NR_PARTITIONS], *pe;
+ int subdev, disk, par;
+ struct device *dv;
+ unsigned long offset, nextoffset;
+
+ disk = extdev / DEV_PER_DRIVE;
+ par = extdev % DEV_PER_DRIVE - 1;
+ subdev = MINOR_d0p0s0 + (disk * NR_PARTITIONS + par) * NR_PARTITIONS;
+
+ offset = 0;
+ do {
+ if (!get_part_table(dp, extdev, offset, table)) return;
+ sort(table);
+
+ /* The table should contain one logical partition and optionally
+ * another extended partition. (It's a linked list.)
+ */
+ nextoffset = 0;
+ for (par = 0; par < NR_PARTITIONS; par++) {
+ pe = &table[par];
+ if (ext_part(pe->sysind)) {
+ nextoffset = pe->lowsec;
+ } else
+ if (pe->sysind != NO_PART) {
+ if ((dv = (*dp->dr_prepare)(subdev)) == NIL_DEV) return;
+
+ dv->dv_base = mul64u(extbase + offset + pe->lowsec,
+ SECTOR_SIZE);
+ dv->dv_size = mul64u(pe->size, SECTOR_SIZE);
+
+ /* Out of devices? */
+ if (++subdev % NR_PARTITIONS == 0) return;
+ }
+ }
+ } while ((offset = nextoffset) != 0);
+}
+
+/*============================================================================*
+ * get_part_table *
+ *============================================================================*/
+PRIVATE int get_part_table(dp, device, offset, table)
+struct driver *dp;
+int device;
+unsigned long offset; /* sector offset to the table */
+struct part_entry *table; /* four entries */
+{
+/* Read the partition table for the device, return true iff there were no
+ * errors.
+ */
+ iovec_t iovec1;
+ u64_t position;
+ static unsigned char partbuf[CD_SECTOR_SIZE];
+
+ position = mul64u(offset, SECTOR_SIZE);
+ iovec1.iov_addr = (vir_bytes) partbuf;
+ iovec1.iov_size = CD_SECTOR_SIZE;
+ if ((*dp->dr_prepare)(device) != NIL_DEV) {
+ (void) (*dp->dr_transfer)(SELF, DEV_GATHER_S, position, &iovec1, 1, 0);
+ }
+ if (iovec1.iov_size != 0) {
+ return 0;
+ }
+ if (partbuf[510] != 0x55 || partbuf[511] != 0xAA) {
+ /* Invalid partition table. */
+ return 0;
+ }
+ memcpy(table, (partbuf + PART_TABLE_OFF), NR_PARTITIONS * sizeof(table[0]));
+ return 1;
+}
+
+/*===========================================================================*
+ * sort *
+ *===========================================================================*/
+PRIVATE void sort(table)
+struct part_entry *table;
+{
+/* Sort a partition table. */
+ struct part_entry *pe, tmp;
+ int n = NR_PARTITIONS;
+
+ do {
+ for (pe = table; pe < table + NR_PARTITIONS-1; pe++) {
+ if (pe[0].sysind == NO_PART
+ || (pe[0].lowsec > pe[1].lowsec
+ && pe[1].sysind != NO_PART)) {
+ tmp = pe[0]; pe[0] = pe[1]; pe[1] = tmp;
+ }
+ }
+ } while (--n > 0);
+}
