575 lines
17 KiB
C
575 lines
17 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 "../drivers.h"
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#include "../libdriver/driver.h"
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#include "../libdriver/drvlib.h"
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#include <minix/sysutil.h>
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#include <minix/safecopies.h>
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#include <minix/keymap.h>
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#include <sys/ioc_disk.h>
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#include <ibm/int86.h>
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#include <assert.h>
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#define ME "BIOS_WINI"
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/* Error codes */
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#define ERR (-1) /* general error */
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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 MAX_SECS 255 /* bios can transfer this many sectors */
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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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PRIVATE int pc_at = 1; /* What about PC XTs? */
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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 vir_bytes bios_buf_vir, bios_buf_size;
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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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PRIVATE char my_bios_buf[16384];
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PRIVATE cp_grant_id_t my_bios_grant_id;
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_PROTOTYPE(int main, (void) );
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FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
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FORWARD _PROTOTYPE( char *w_name, (void) );
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FORWARD _PROTOTYPE( int w_transfer, (int proc_nr, int opcode, off_t position,
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iovec_t *iov, unsigned nr_req, int safe) );
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FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) );
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FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) );
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FORWARD _PROTOTYPE( void w_init, (void) );
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FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry));
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FORWARD _PROTOTYPE( int w_other, (struct driver *dp, message *m_ptr, int) );
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FORWARD _PROTOTYPE( int my_vircopy, (endpoint_t, int, vir_bytes, endpoint_t,
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int, vir_bytes, size_t, size_t));
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/* Entry points to this driver. */
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PRIVATE struct driver w_dtab = {
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w_name, /* current device's name */
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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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do_diocntl, /* get or set a partition's geometry */
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w_prepare, /* prepare for I/O on a given minor device */
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w_transfer, /* do the I/O */
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nop_cleanup, /* no cleanup needed */
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w_geometry, /* tell the geometry of the disk */
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nop_signal, /* no cleanup needed on shutdown */
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nop_alarm, /* ignore leftover alarms */
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nop_cancel, /* ignore CANCELs */
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nop_select, /* ignore selects */
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w_other, /* catch-all for unrecognized commands and ioctls */
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NULL /* leftover hardware interrupts */
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};
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/*===========================================================================*
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* bios_winchester_task *
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*===========================================================================*/
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PUBLIC int main()
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{
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long v;
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struct sigaction sa;
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sa.sa_handler = SIG_MESS;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGTERM,&sa,NULL)<0) panic("BIOS","sigaction failed", errno);
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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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/* Set special disk parameters then call the generic main loop. */
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driver_task(&w_dtab);
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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(device)
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int 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(NIL_DEV);
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}
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if (w_drive >= MAX_DRIVES || !w_wn->present)
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return NIL_DEV;
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return(w_dv);
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}
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/*===========================================================================*
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* w_name *
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*===========================================================================*/
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PRIVATE char *w_name()
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{
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/* Return a name for the current device. */
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static char name[] = "bios-d0";
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name[6] = '0' + w_drive;
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return name;
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}
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/*===========================================================================*
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* w_transfer *
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*===========================================================================*/
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PRIVATE int my_vircopy(from_proc, from_seg, from_vir, to_proc, to_seg,
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to_vir, grant_offset, size)
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endpoint_t from_proc;
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int from_seg;
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vir_bytes from_vir;
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endpoint_t to_proc;
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int to_seg;
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vir_bytes to_vir;
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vir_bytes grant_offset;
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size_t size;
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{
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phys_bytes addr;
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int r;
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if(from_seg == GRANT_SEG) {
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if((r=sys_umap(from_proc, GRANT_SEG,
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(vir_bytes)from_vir, (phys_bytes)size+grant_offset,
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&addr)) != OK) {
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panic(ME, "sys_umap in my_vircopy failed", r);
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}
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from_seg = PHYS_SEG;
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from_vir = addr + grant_offset;
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}
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if(to_seg == GRANT_SEG) {
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if((r=sys_umap(to_proc, GRANT_SEG,
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(vir_bytes)to_vir, (phys_bytes)size+grant_offset,
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&addr)) != OK) {
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panic(ME, "sys_umap in my_vircopy failed", r);
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}
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to_seg = PHYS_SEG;
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to_vir = addr + grant_offset;
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}
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return sys_physcopy(from_proc, from_seg, from_vir,
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to_proc, to_seg, to_vir, size);
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}
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/*===========================================================================*
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* w_transfer *
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*===========================================================================*/
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PRIVATE int w_transfer(proc_nr, opcode, position, iov, nr_req, safe)
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int proc_nr; /* process doing the request */
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int opcode; /* DEV_GATHER or DEV_SCATTER */
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off_t position; /* offset on device to read or write */
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iovec_t *iov; /* pointer to read or write request vector */
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unsigned nr_req; /* length of request vector */
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int safe; /* use safecopies? */
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{
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struct wini *wn = w_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 nbytes, count, chunk;
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unsigned long block;
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vir_bytes i13e_rw_off, rem_buf_size;
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size_t vir_offset = 0;
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unsigned long dv_size = cv64ul(w_dv->dv_size);
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unsigned secspcyl = wn->heads * wn->sectors;
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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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/* Check disk address. */
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if ((position & SECTOR_MASK) != 0) return(EINVAL);
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errors = 0;
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i13e_rw_off= bios_buf_size-sizeof(i13e_rw);
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rem_buf_size= (i13e_rw_off & ~SECTOR_MASK);
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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 (position >= dv_size) return(OK); /* At EOF */
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if (position + nbytes > dv_size) nbytes = dv_size - position;
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block = div64u(add64ul(w_dv->dv_base, position), 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 (opcode == DEV_SCATTER) {
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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 = iov->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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r= my_vircopy(proc_nr, safe ? GRANT_SEG : D,
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(vir_bytes) iop->iov_addr,
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SYSTEM, D, bios_buf_vir+count,
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vir_offset, chunk);
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if (r != OK)
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panic(ME, "copy failed", r);
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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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r= sys_vircopy(SELF, D, (vir_bytes)&i13e_rw,
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SYSTEM, D, (bios_buf_vir+i13e_rw_off),
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sizeof(i13e_rw));
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if (r != OK)
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panic(ME, "sys_vircopy failed", r);
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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 = opcode == DEV_SCATTER ? 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 = opcode == DEV_SCATTER ? 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(ME, "BIOS call failed", 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 (opcode == DEV_GATHER) {
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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 = iov->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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r = my_vircopy(SYSTEM, D, bios_buf_vir+count,
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proc_nr, safe ? GRANT_SEG : D,
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iop->iov_addr, vir_offset, chunk);
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if (r != OK)
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panic(ME, "sys_vircopy failed", r);
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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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position += nbytes;
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for (;;) {
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if (nbytes < iov->iov_size) {
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/* Not done with this one yet. */
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vir_offset += nbytes;
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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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vir_offset = 0;
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iov->iov_size = 0;
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if (nbytes == 0) {
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/* The rest is optional, so we return to give FS a
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* chance to think it over.
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*/
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return(OK);
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}
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iov++;
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nr_req--;
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}
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}
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return(OK);
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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(dp, m_ptr)
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struct driver *dp;
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message *m_ptr;
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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(m_ptr->DEVICE) == NIL_DEV) 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(dp, m_ptr)
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struct driver *dp;
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message *m_ptr;
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{
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/* Device close: Release a device. */
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if (w_prepare(m_ptr->DEVICE) == NIL_DEV) 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()
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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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r= sys_getbiosbuffer(&bios_buf_vir, &bios_buf_size);
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if (r != OK)
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panic(ME, "sys_getbiosbuffer failed", r);
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if(bios_buf_size >= sizeof(my_bios_buf)) {
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printf("bios_wini: truncating buffer %d -> %d\n",
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bios_buf_size, sizeof(my_bios_buf));
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bios_buf_size = sizeof(my_bios_buf);
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}
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r= sys_umap(SYSTEM, D, (vir_bytes)bios_buf_vir, (phys_bytes)bios_buf_size,
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&bios_buf_phys);
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if (r != OK)
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panic(ME, "sys_umap failed", r);
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if (bios_buf_phys+bios_buf_size > 0x100000)
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panic(ME, "bad BIOS buffer, phys", 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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bios_buf_size, bios_buf_vir, bios_buf_phys);
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#endif
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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(ME, "BIOS call failed", 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;
|
|
wn->sectors = reg86.u.b.cl & 0x3F;
|
|
wn->cylinders = (reg86.u.b.ch | ((reg86.u.b.cl & 0xC0) << 2)) + 1;
|
|
|
|
capacity = (unsigned long) wn->cylinders * wn->heads * wn->sectors;
|
|
|
|
reg86.u.b.intno = 0x13;
|
|
reg86.u.b.ah = 0x41; /* INT 13 Extensions - Installation check */
|
|
reg86.u.w.bx = 0x55AA;
|
|
reg86.u.b.dl = drive_id;
|
|
|
|
if (pc_at) {
|
|
r= sys_int86(®86);
|
|
if (r != OK)
|
|
panic(ME, "BIOS call failed", r);
|
|
}
|
|
|
|
if (!(reg86.u.w.f & 0x0001) && reg86.u.w.bx == 0xAA55
|
|
&& (reg86.u.w.cx & 0x0001)) {
|
|
/* INT 13 Extensions available. */
|
|
i13e_par.len = 0x001E; /* Input size of parameter packet */
|
|
r= sys_vircopy(SELF, D, (vir_bytes)&i13e_par,
|
|
SYSTEM, D, bios_buf_vir,
|
|
sizeof(i13e_par));
|
|
if (r != OK)
|
|
panic(ME, "sys_vircopy failed\n", r);
|
|
reg86.u.b.intno = 0x13;
|
|
reg86.u.b.ah = 0x48; /* Ext. Get drive parameters. */
|
|
reg86.u.b.dl = drive_id;
|
|
reg86.u.w.si = bios_buf_phys % HCLICK_SIZE;
|
|
reg86.u.w.ds = bios_buf_phys / HCLICK_SIZE;
|
|
|
|
r= sys_int86(®86);
|
|
if (r != OK)
|
|
panic(ME, "BIOS call failed", r);
|
|
|
|
r= sys_vircopy(SYSTEM, D, bios_buf_vir,
|
|
SELF, D, (vir_bytes)&i13e_par,
|
|
sizeof(i13e_par));
|
|
if (r != OK)
|
|
panic(ME, "sys_vircopy failed\n", 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("%s: %lu sectors\n", w_name(), capacity);
|
|
} else {
|
|
printf("%s: %d cylinders, %d heads, %d sectors per track\n",
|
|
w_name(), wn->cylinders, wn->heads, wn->sectors);
|
|
}
|
|
wn->part[0].dv_size = mul64u(capacity, SECTOR_SIZE);
|
|
}
|
|
}
|
|
|
|
/*============================================================================*
|
|
* w_geometry *
|
|
*============================================================================*/
|
|
PRIVATE void w_geometry(entry)
|
|
struct partition *entry;
|
|
{
|
|
entry->cylinders = w_wn->cylinders;
|
|
entry->heads = w_wn->heads;
|
|
entry->sectors = w_wn->sectors;
|
|
}
|
|
|
|
/*============================================================================*
|
|
* w_other *
|
|
*============================================================================*/
|
|
PRIVATE int w_other(dr, m, safe)
|
|
struct driver *dr;
|
|
message *m;
|
|
int safe;
|
|
{
|
|
int r, timeout, prev;
|
|
|
|
if (m->m_type != DEV_IOCTL && m->m_type != DEV_IOCTL_S ) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->REQUEST == DIOCOPENCT) {
|
|
int count;
|
|
if (w_prepare(m->DEVICE) == NIL_DEV) return ENXIO;
|
|
count = w_wn->open_ct;
|
|
if(safe) {
|
|
r=sys_safecopyto(m->IO_ENDPT, (vir_bytes)m->ADDRESS,
|
|
0, (vir_bytes)&count, sizeof(count), D);
|
|
} else {
|
|
r=sys_datacopy(SELF, (vir_bytes)&count,
|
|
m->IO_ENDPT, (vir_bytes)m->ADDRESS, sizeof(count));
|
|
}
|
|
|
|
if(r != OK)
|
|
return r;
|
|
return OK;
|
|
}
|
|
|
|
return EINVAL;
|
|
}
|
|
|