528 lines
16 KiB
C
528 lines
16 KiB
C
/* This file contains the "device dependent" part of a hard disk driver that
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* uses the ROM BIOS. It makes a call and just waits for the transfer to
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* happen. It is not interrupt driven and thus will (*) have poor performance.
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* The advantage is that it should work on virtually any PC, XT, 386, PS/2
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* or clone. The demo disk uses this driver. It is suggested that all
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* MINIX users try the other drivers, and use this one only as a last resort,
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* if all else fails.
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*
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* (*) The performance is within 10% of the AT driver for reads on any disk
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* and writes on a 2:1 interleaved disk, it will be DMA_BUF_SIZE bytes
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* per revolution for a minimum of 60 kb/s for writes to 1:1 disks.
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*
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* The file contains one entry point:
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*
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* bios_winchester_task: main entry when system is brought up
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*
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*
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* Changes:
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* 30 Apr 1992 by Kees J. Bot: device dependent/independent split.
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* 14 May 2000 by Kees J. Bot: d-d/i rewrite.
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*/
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#include <minix/drivers.h>
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#include <minix/blockdriver.h>
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#include <minix/drvlib.h>
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#include <minix/sysutil.h>
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#include <minix/safecopies.h>
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#include <sys/ioc_disk.h>
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#include <machine/int86.h>
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#include <assert.h>
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/* Parameters for the disk drive. */
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#define MAX_DRIVES 8 /* this driver supports 8 drives (d0 - d7)*/
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#define NR_MINORS (MAX_DRIVES * DEV_PER_DRIVE)
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#define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
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#define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE)
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/* Variables. */
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PRIVATE struct wini { /* main drive struct, one entry per drive */
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unsigned cylinders; /* number of cylinders */
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unsigned heads; /* number of heads */
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unsigned sectors; /* number of sectors per track */
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unsigned open_ct; /* in-use count */
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int drive_id; /* Drive ID at BIOS level */
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int present; /* Valid drive */
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int int13ext; /* IBM/MS INT 13 extensions supported? */
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struct device part[DEV_PER_DRIVE]; /* disks and partitions */
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struct device subpart[SUB_PER_DRIVE]; /* subpartitions */
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} wini[MAX_DRIVES], *w_wn;
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PRIVATE int w_drive; /* selected drive */
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PRIVATE struct device *w_dv; /* device's base and size */
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PRIVATE char *bios_buf_v;
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PRIVATE phys_bytes bios_buf_phys;
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PRIVATE int remap_first = 0; /* Remap drives for CD HD emulation */
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#define BIOSBUF 16384
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_PROTOTYPE(int main, (void) );
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FORWARD _PROTOTYPE( struct device *w_prepare, (dev_t device) );
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FORWARD _PROTOTYPE( struct device *w_part, (dev_t minor) );
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FORWARD _PROTOTYPE( ssize_t w_transfer, (dev_t minor, int do_write,
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u64_t position, endpoint_t endpt, iovec_t *iov, unsigned int nr_req,
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int flags) );
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FORWARD _PROTOTYPE( int w_do_open, (dev_t minor, int access) );
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FORWARD _PROTOTYPE( int w_do_close, (dev_t minor) );
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FORWARD _PROTOTYPE( void w_init, (void) );
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FORWARD _PROTOTYPE( void w_geometry, (dev_t minor, struct partition *entry));
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FORWARD _PROTOTYPE( int w_ioctl, (dev_t minor, unsigned int request,
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endpoint_t endpt, cp_grant_id_t grant) );
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/* Entry points to this driver. */
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PRIVATE struct blockdriver w_dtab = {
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BLOCKDRIVER_TYPE_DISK, /* handle partition requests */
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w_do_open, /* open or mount request, initialize device */
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w_do_close, /* release device */
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w_transfer, /* do the I/O */
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w_ioctl, /* I/O control */
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NULL, /* no cleanup needed */
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w_part, /* return partition information structure */
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w_geometry, /* tell the geometry of the disk */
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NULL, /* leftover hardware interrupts */
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NULL, /* ignore leftover alarms */
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NULL, /* catch-all for unrecognized commands */
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NULL /* no threading support */
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};
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/* SEF functions and variables. */
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FORWARD _PROTOTYPE( void sef_local_startup, (void) );
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FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
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/*===========================================================================*
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* bios_winchester_task *
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*===========================================================================*/
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PUBLIC int main(void)
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{
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/* SEF local startup. */
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sef_local_startup();
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/* Call the generic receive loop. */
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blockdriver_task(&w_dtab);
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return(OK);
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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PRIVATE void sef_local_startup(void)
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{
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/* Register init callbacks. */
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sef_setcb_init_fresh(sef_cb_init_fresh);
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sef_setcb_init_lu(sef_cb_init_fresh);
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/* Register live update callbacks. */
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sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
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sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*===========================================================================*
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* sef_cb_init_fresh *
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*===========================================================================*/
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PRIVATE int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
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{
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/* Initialize the bios_wini driver. */
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long v;
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v = 0;
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env_parse("bios_remap_first", "d", 0, &v, 0, 1);
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remap_first = v;
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/* Announce we are up! */
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blockdriver_announce();
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return(OK);
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}
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/*===========================================================================*
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* w_prepare *
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*===========================================================================*/
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PRIVATE struct device *w_prepare(dev_t device)
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{
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/* Prepare for I/O on a device. */
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if (device < NR_MINORS) { /* d0, d0p[0-3], d1, ... */
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w_drive = device / DEV_PER_DRIVE; /* save drive number */
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w_wn = &wini[w_drive];
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w_dv = &w_wn->part[device % DEV_PER_DRIVE];
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} else
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if ((unsigned) (device -= MINOR_d0p0s0) < NR_SUBDEVS) {/*d[0-7]p[0-3]s[0-3]*/
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w_drive = device / SUB_PER_DRIVE;
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w_wn = &wini[w_drive];
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w_dv = &w_wn->subpart[device % SUB_PER_DRIVE];
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} else {
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return(NULL);
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}
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if (w_drive >= MAX_DRIVES || !w_wn->present)
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return NULL;
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return(w_dv);
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}
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/*===========================================================================*
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* w_part *
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*===========================================================================*/
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PRIVATE struct device *w_part(dev_t minor)
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{
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/* Return a pointer to the partition information of the given minor device. */
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return w_prepare(minor);
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}
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/*===========================================================================*
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* w_transfer *
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*===========================================================================*/
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PRIVATE ssize_t w_transfer(
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dev_t minor, /* minor device number */
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int do_write, /* read or write? */
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u64_t pos64, /* offset on device to read or write */
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endpoint_t proc_nr, /* process doing the request */
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iovec_t *iov, /* pointer to read or write request vector */
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unsigned int nr_req, /* length of request vector */
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int UNUSED(flags) /* transfer flags */
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)
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{
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struct wini *wn;
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iovec_t *iop, *iov_end = iov + nr_req;
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int r, errors;
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unsigned count;
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vir_bytes chunk, nbytes;
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unsigned long block;
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vir_bytes i13e_rw_off, rem_buf_size;
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unsigned secspcyl;
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struct int13ext_rw {
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u8_t len;
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u8_t res1;
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u16_t count;
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u16_t addr[2];
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u32_t block[2];
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} *i13e_rw;
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struct reg86u reg86;
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u32_t lopos;
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ssize_t total;
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if (w_prepare(minor) == NULL) return(ENXIO);
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wn = w_wn;
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secspcyl = wn->heads * wn->sectors;
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lopos= ex64lo(pos64);
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/* Check disk address. */
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if ((lopos & SECTOR_MASK) != 0) return(EINVAL);
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total = 0;
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errors = 0;
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i13e_rw_off= BIOSBUF-sizeof(*i13e_rw);
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rem_buf_size= (i13e_rw_off & ~SECTOR_MASK);
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i13e_rw = (struct int13ext_rw *) (bios_buf_v + i13e_rw_off);
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assert(rem_buf_size != 0);
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while (nr_req > 0) {
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/* How many bytes to transfer? */
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nbytes = 0;
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for (iop = iov; iop < iov_end; iop++) {
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if (nbytes + iop->iov_size > rem_buf_size) {
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/* Don't do half a segment if you can avoid it. */
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if (nbytes == 0) nbytes = rem_buf_size;
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break;
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}
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nbytes += iop->iov_size;
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}
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if ((nbytes & SECTOR_MASK) != 0) return(EINVAL);
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/* Which block on disk and how close to EOF? */
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if (cmp64(pos64, w_dv->dv_size) >= 0) return(total); /* At EOF */
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if (cmp64(add64u(pos64, nbytes), w_dv->dv_size) > 0) {
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u64_t n;
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n = sub64(w_dv->dv_size, pos64);
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assert(ex64hi(n) == 0);
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nbytes = ex64lo(n);
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}
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block = div64u(add64(w_dv->dv_base, pos64), SECTOR_SIZE);
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/* Degrade to per-sector mode if there were errors. */
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if (errors > 0) nbytes = SECTOR_SIZE;
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if (do_write) {
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/* Copy from user space to the DMA buffer. */
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count = 0;
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for (iop = iov; count < nbytes; iop++) {
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chunk = iop->iov_size;
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if (count + chunk > nbytes) chunk = nbytes - count;
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assert(chunk <= rem_buf_size);
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if(proc_nr != SELF) {
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r=sys_safecopyfrom(proc_nr,
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(cp_grant_id_t) iop->iov_addr,
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0, (vir_bytes) (bios_buf_v+count),
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chunk, D);
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if (r != OK)
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panic("copy failed: %d", r);
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} else {
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memcpy(bios_buf_v+count,
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(char *) iop->iov_addr, chunk);
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}
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count += chunk;
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}
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}
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/* Do the transfer */
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if (wn->int13ext) {
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i13e_rw->len = 0x10;
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i13e_rw->res1 = 0;
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i13e_rw->count = nbytes >> SECTOR_SHIFT;
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i13e_rw->addr[0] = bios_buf_phys % HCLICK_SIZE;
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i13e_rw->addr[1] = bios_buf_phys / HCLICK_SIZE;
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i13e_rw->block[0] = block;
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i13e_rw->block[1] = 0;
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/* Set up an extended read or write BIOS call. */
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reg86.u.b.intno = 0x13;
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reg86.u.w.ax = do_write ? 0x4300 : 0x4200;
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reg86.u.b.dl = wn->drive_id;
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reg86.u.w.si = (bios_buf_phys + i13e_rw_off) % HCLICK_SIZE;
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reg86.u.w.ds = (bios_buf_phys + i13e_rw_off) / HCLICK_SIZE;
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} else {
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/* Set up an ordinary read or write BIOS call. */
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unsigned cylinder = block / secspcyl;
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unsigned sector = (block % wn->sectors) + 1;
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unsigned head = (block % secspcyl) / wn->sectors;
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = do_write ? 0x03 : 0x02;
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reg86.u.b.al = nbytes >> SECTOR_SHIFT;
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reg86.u.w.bx = bios_buf_phys % HCLICK_SIZE;
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reg86.u.w.es = bios_buf_phys / HCLICK_SIZE;
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reg86.u.b.ch = cylinder & 0xFF;
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reg86.u.b.cl = sector | ((cylinder & 0x300) >> 2);
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reg86.u.b.dh = head;
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reg86.u.b.dl = wn->drive_id;
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}
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r= sys_int86(®86);
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if (r != OK)
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panic("BIOS call failed: %d", r);
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if (reg86.u.w.f & 0x0001) {
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/* An error occurred, try again sector by sector unless */
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if (++errors == 2) return(EIO);
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continue;
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}
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if (!do_write) {
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/* Copy from the DMA buffer to user space. */
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count = 0;
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for (iop = iov; count < nbytes; iop++) {
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chunk = iop->iov_size;
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if (count + chunk > nbytes) chunk = nbytes - count;
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assert(chunk <= rem_buf_size);
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if(proc_nr != SELF) {
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r=sys_safecopyto(proc_nr, iop->iov_addr,
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0, (vir_bytes) (bios_buf_v+count),
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chunk, D);
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if (r != OK)
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panic("sys_safecopy failed: %d", r);
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} else {
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memcpy((char *) iop->iov_addr,
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bios_buf_v+count, chunk);
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}
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count += chunk;
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}
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}
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/* Book the bytes successfully transferred. */
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pos64 = add64ul(pos64, nbytes);
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total += nbytes;
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while (nbytes > 0) {
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if (nbytes < iov->iov_size) {
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/* Not done with this one yet. */
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iov->iov_size -= nbytes;
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break;
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}
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nbytes -= iov->iov_size;
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iov->iov_size = 0;
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iov++;
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nr_req--;
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}
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}
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return(total);
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}
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/*============================================================================*
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* w_do_open *
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*============================================================================*/
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PRIVATE int w_do_open(dev_t minor, int UNUSED(access))
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{
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/* Device open: Initialize the controller and read the partition table. */
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static int init_done = FALSE;
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if (!init_done) { w_init(); init_done = TRUE; }
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if (w_prepare(minor) == NULL) return(ENXIO);
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if (w_wn->open_ct++ == 0) {
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/* Partition the disk. */
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partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY, 0);
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}
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return(OK);
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}
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/*============================================================================*
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* w_do_close *
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*============================================================================*/
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PRIVATE int w_do_close(dev_t minor)
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{
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/* Device close: Release a device. */
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if (w_prepare(minor) == NULL) return(ENXIO);
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w_wn->open_ct--;
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return(OK);
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}
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/*===========================================================================*
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* w_init *
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*===========================================================================*/
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PRIVATE void w_init(void)
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{
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/* This routine is called at startup to initialize the drive parameters. */
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int r, drive, drive_id, nr_drives;
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struct wini *wn;
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unsigned long capacity;
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struct int13ext_params {
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u16_t len;
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u16_t flags;
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u32_t cylinders;
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u32_t heads;
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u32_t sectors;
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u32_t capacity[2];
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u16_t bts_per_sec;
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u16_t config[2];
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} *i13e_par;
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struct reg86u reg86;
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/* Ask the system task for a suitable buffer */
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if(!(bios_buf_v = alloc_contig(BIOSBUF, AC_LOWER1M, &bios_buf_phys))) {
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panic("allocating bios buffer failed: %d", ENOMEM);
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}
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if (bios_buf_phys+BIOSBUF > 0x100000)
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panic("bad BIOS buffer / phys: %d", bios_buf_phys);
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#if 0
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printf("bios_wini: got buffer size %d, virtual 0x%x, phys 0x%x\n",
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BIOSBUF, bios_buf_v, bios_buf_phys);
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#endif
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i13e_par = (struct int13ext_params *) bios_buf_v;
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/* Get the geometry of the drives */
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for (drive = 0; drive < MAX_DRIVES; drive++) {
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if (remap_first)
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{
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if (drive == 7)
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drive_id= 0x80;
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else
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drive_id= 0x80 + drive + 1;
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}
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else
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drive_id= 0x80 + drive;
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(void) w_prepare(drive * DEV_PER_DRIVE);
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wn = w_wn;
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wn->drive_id= drive_id;
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x08; /* Get drive parameters. */
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reg86.u.b.dl = drive_id;
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r= sys_int86(®86);
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if (r != OK)
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panic("BIOS call failed: %d", r);
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nr_drives = !(reg86.u.w.f & 0x0001) ? reg86.u.b.dl : drive;
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if (drive_id >= 0x80 + nr_drives) continue;
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wn->present= 1;
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wn->heads = reg86.u.b.dh + 1;
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wn->sectors = reg86.u.b.cl & 0x3F;
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wn->cylinders = (reg86.u.b.ch | ((reg86.u.b.cl & 0xC0) << 2)) + 1;
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capacity = (unsigned long) wn->cylinders * wn->heads * wn->sectors;
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x41; /* INT 13 Extensions - Installation check */
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reg86.u.w.bx = 0x55AA;
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reg86.u.b.dl = drive_id;
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r= sys_int86(®86);
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if (r != OK)
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panic("BIOS call failed: %d", r);
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if (!(reg86.u.w.f & 0x0001) && reg86.u.w.bx == 0xAA55
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&& (reg86.u.w.cx & 0x0001)) {
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/* INT 13 Extensions available. */
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i13e_par->len = 0x001E; /* Input size of parameter packet */
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x48; /* Ext. Get drive parameters. */
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reg86.u.b.dl = drive_id;
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reg86.u.w.si = bios_buf_phys % HCLICK_SIZE;
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reg86.u.w.ds = bios_buf_phys / HCLICK_SIZE;
|
|
|
|
r= sys_int86(®86);
|
|
if (r != OK)
|
|
panic("BIOS call failed: %d", r);
|
|
|
|
if (!(reg86.u.w.f & 0x0001)) {
|
|
wn->int13ext = 1; /* Extensions can be used. */
|
|
capacity = i13e_par->capacity[0];
|
|
if (i13e_par->capacity[1] != 0) capacity = 0xFFFFFFFF;
|
|
}
|
|
}
|
|
|
|
if (wn->int13ext) {
|
|
printf("bios-d%u: %lu sectors\n", w_drive, capacity);
|
|
} else {
|
|
printf("bios-d%u: %d cylinders, %d heads, "
|
|
"%d sectors per track\n",
|
|
w_drive, wn->cylinders, wn->heads, wn->sectors);
|
|
}
|
|
wn->part[0].dv_size = mul64u(capacity, SECTOR_SIZE);
|
|
}
|
|
}
|
|
|
|
/*============================================================================*
|
|
* w_geometry *
|
|
*============================================================================*/
|
|
PRIVATE void w_geometry(dev_t minor, struct partition *entry)
|
|
{
|
|
if (w_prepare(minor) == NULL) return;
|
|
|
|
entry->cylinders = w_wn->cylinders;
|
|
entry->heads = w_wn->heads;
|
|
entry->sectors = w_wn->sectors;
|
|
}
|
|
|
|
/*============================================================================*
|
|
* w_ioctl *
|
|
*============================================================================*/
|
|
PRIVATE int w_ioctl(dev_t minor, unsigned int request, endpoint_t endpt,
|
|
cp_grant_id_t grant)
|
|
{
|
|
int count;
|
|
|
|
if (w_prepare(minor) == NULL) return ENXIO;
|
|
|
|
if (request == DIOCOPENCT) {
|
|
count = w_wn->open_ct;
|
|
return sys_safecopyto(endpt, grant, 0, (vir_bytes)&count,
|
|
sizeof(count), D);
|
|
}
|
|
|
|
return EINVAL;
|
|
}
|