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minix/drivers/bios_wini/bios_wini.c
Jorrit Herder e561081545 Miscellaneous clean ups and fixes to the kernel. 
Support for FLOPPY in boot image. (Set controller=fd at boot monitor.)
Moved major device numbers to <minix/dmap.h> (maybe rename to dev.h?)
2005-08-04 09:26:36 +00:00

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/* This file contains the "device dependent" part of a hard disk driver that
* uses the ROM BIOS. It makes a call and just waits for the transfer to
* happen. It is not interrupt driven and thus will (*) have poor performance.
* The advantage is that it should work on virtually any PC, XT, 386, PS/2
* or clone. The demo disk uses this driver. It is suggested that all
* MINIX users try the other drivers, and use this one only as a last resort,
* if all else fails.
*
* (*) The performance is within 10% of the AT driver for reads on any disk
* and writes on a 2:1 interleaved disk, it will be DMA_BUF_SIZE bytes
* per revolution for a minimum of 60 kb/s for writes to 1:1 disks.
*
* The file contains one entry point:
*
* bios_winchester_task: main entry when system is brought up
*
*
* Changes:
* 30 Apr 1992 by Kees J. Bot: device dependent/independent split.
* 14 May 2000 by Kees J. Bot: d-d/i rewrite.
*/
#include "../drivers.h"
#include "../libdriver/driver.h"
#include "../libdriver/drvlib.h"
#include <minix/sysutil.h>
#include <minix/keymap.h>
#include <sys/ioc_disk.h>
#include <ibm/int86.h>
#include <assert.h>
#define ME "BIOS_WINI"
/* Error codes */
#define ERR (-1) /* general error */
/* Parameters for the disk drive. */
#define MAX_DRIVES 4 /* this driver supports 4 drives (d0 - d3)*/
#define MAX_SECS 255 /* bios can transfer this many sectors */
#define NR_MINORS (MAX_DRIVES * DEV_PER_DRIVE)
#define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
#define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE)
PRIVATE int pc_at = 1; /* What about PC XTs? */
/* Variables. */
PRIVATE struct wini { /* main drive struct, one entry per drive */
unsigned cylinders; /* number of cylinders */
unsigned heads; /* number of heads */
unsigned sectors; /* number of sectors per track */
unsigned open_ct; /* in-use count */
int int13ext; /* IBM/MS INT 13 extensions supported? */
struct device part[DEV_PER_DRIVE]; /* disks and partitions */
struct device subpart[SUB_PER_DRIVE]; /* subpartitions */
} wini[MAX_DRIVES], *w_wn;
PRIVATE int nr_drives = MAX_DRIVES; /* Number of drives */
PRIVATE int w_drive; /* selected drive */
PRIVATE struct device *w_dv; /* device's base and size */
PRIVATE vir_bytes bios_buf_vir, bios_buf_size;
PRIVATE phys_bytes bios_buf_phys;
_PROTOTYPE(int main, (void) );
FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
FORWARD _PROTOTYPE( char *w_name, (void) );
FORWARD _PROTOTYPE( int w_transfer, (int proc_nr, int opcode, off_t position,
iovec_t *iov, unsigned nr_req) );
FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( void w_init, (void) );
FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry));
FORWARD _PROTOTYPE( int nop_other, (struct driver *dp, message *m_ptr) );
/* Entry points to this driver. */
PRIVATE struct driver w_dtab = {
w_name, /* current device's name */
w_do_open, /* open or mount request, initialize device */
w_do_close, /* release device */
do_diocntl, /* get or set a partition's geometry */
w_prepare, /* prepare for I/O on a given minor device */
w_transfer, /* do the I/O */
nop_cleanup, /* no cleanup needed */
w_geometry, /* tell the geometry of the disk */
nop_signal, /* no cleanup needed on shutdown */
nop_alarm, /* ignore leftover alarms */
nop_cancel, /* ignore CANCELs */
nop_select, /* ignore selects */
nop_other /* catch-all for unrecognized commands and ioctls */
};
/*===========================================================================*
* bios_winchester_task *
*===========================================================================*/
PUBLIC int main()
{
/* Set special disk parameters then call the generic main loop. */
driver_task(&w_dtab);
}
/*===========================================================================*
* w_prepare *
*===========================================================================*/
PRIVATE struct device *w_prepare(device)
int device;
{
/* Prepare for I/O on a device. */
if (device < NR_MINORS) { /* d0, d0p[0-3], d1, ... */
w_drive = device / DEV_PER_DRIVE; /* save drive number */
w_wn = &wini[w_drive];
w_dv = &w_wn->part[device % DEV_PER_DRIVE];
} else
if ((unsigned) (device -= MINOR_d0p0s0) < NR_SUBDEVS) {/*d[0-7]p[0-3]s[0-3]*/
w_drive = device / SUB_PER_DRIVE;
w_wn = &wini[w_drive];
w_dv = &w_wn->subpart[device % SUB_PER_DRIVE];
} else {
return(NIL_DEV);
}
return(w_drive < nr_drives ? w_dv : NIL_DEV);
}
/*===========================================================================*
* w_name *
*===========================================================================*/
PRIVATE char *w_name()
{
/* Return a name for the current device. */
static char name[] = "bios-d0";
name[6] = '0' + w_drive;
return name;
}
/*===========================================================================*
* w_transfer *
*===========================================================================*/
PRIVATE int w_transfer(proc_nr, opcode, position, iov, nr_req)
int proc_nr; /* process doing the request */
int opcode; /* DEV_GATHER or DEV_SCATTER */
off_t position; /* offset on device to read or write */
iovec_t *iov; /* pointer to read or write request vector */
unsigned nr_req; /* length of request vector */
{
struct wini *wn = w_wn;
iovec_t *iop, *iov_end = iov + nr_req;
int r, errors;
unsigned nbytes, count, chunk;
unsigned long block;
vir_bytes i13e_rw_off, rem_buf_size;
unsigned long dv_size = cv64ul(w_dv->dv_size);
unsigned secspcyl = wn->heads * wn->sectors;
struct int13ext_rw {
u8_t len;
u8_t res1;
u16_t count;
u16_t addr[2];
u32_t block[2];
} i13e_rw;
struct reg86u reg86;
/* Check disk address. */
if ((position & SECTOR_MASK) != 0) return(EINVAL);
errors = 0;
i13e_rw_off= bios_buf_size-sizeof(i13e_rw);
rem_buf_size= (i13e_rw_off & ~SECTOR_MASK);
assert(rem_buf_size != 0);
while (nr_req > 0) {
/* How many bytes to transfer? */
nbytes = 0;
for (iop = iov; iop < iov_end; iop++) {
if (nbytes + iop->iov_size > rem_buf_size) {
/* Don't do half a segment if you can avoid it. */
if (nbytes == 0) nbytes = rem_buf_size;
break;
}
nbytes += iop->iov_size;
}
if ((nbytes & SECTOR_MASK) != 0) return(EINVAL);
/* Which block on disk and how close to EOF? */
if (position >= dv_size) return(OK); /* At EOF */
if (position + nbytes > dv_size) nbytes = dv_size - position;
block = div64u(add64ul(w_dv->dv_base, position), SECTOR_SIZE);
/* Degrade to per-sector mode if there were errors. */
if (errors > 0) nbytes = SECTOR_SIZE;
if (opcode == DEV_SCATTER) {
/* Copy from user space to the DMA buffer. */
count = 0;
for (iop = iov; count < nbytes; iop++) {
chunk = iov->iov_size;
if (count + chunk > nbytes) chunk = nbytes - count;
assert(chunk <= rem_buf_size);
r= sys_vircopy(proc_nr, D, iop->iov_addr,
SYSTEM, D, bios_buf_vir+count,
chunk);
if (r != OK)
panic(ME, "sys_vircopy failed", r);
count += chunk;
}
}
/* Do the transfer */
if (wn->int13ext) {
i13e_rw.len = 0x10;
i13e_rw.res1 = 0;
i13e_rw.count = nbytes >> SECTOR_SHIFT;
i13e_rw.addr[0] = bios_buf_phys % HCLICK_SIZE;
i13e_rw.addr[1] = bios_buf_phys / HCLICK_SIZE;
i13e_rw.block[0] = block;
i13e_rw.block[1] = 0;
r= sys_vircopy(SELF, D, (vir_bytes)&i13e_rw,
SYSTEM, D, (bios_buf_vir+i13e_rw_off),
sizeof(i13e_rw));
if (r != OK)
panic(ME, "sys_vircopy failed", r);
/* Set up an extended read or write BIOS call. */
reg86.u.b.intno = 0x13;
reg86.u.w.ax = opcode == DEV_SCATTER ? 0x4300 : 0x4200;
reg86.u.b.dl = 0x80 + w_drive;
reg86.u.w.si = (bios_buf_phys + i13e_rw_off) % HCLICK_SIZE;
reg86.u.w.ds = (bios_buf_phys + i13e_rw_off) / HCLICK_SIZE;
} else {
/* Set up an ordinary read or write BIOS call. */
unsigned cylinder = block / secspcyl;
unsigned sector = (block % wn->sectors) + 1;
unsigned head = (block % secspcyl) / wn->sectors;
reg86.u.b.intno = 0x13;
reg86.u.b.ah = opcode == DEV_SCATTER ? 0x03 : 0x02;
reg86.u.b.al = nbytes >> SECTOR_SHIFT;
reg86.u.w.bx = (bios_buf_phys + i13e_rw_off) % HCLICK_SIZE;
reg86.u.w.es = (bios_buf_phys + i13e_rw_off) / HCLICK_SIZE;
reg86.u.b.ch = cylinder & 0xFF;
reg86.u.b.cl = sector | ((cylinder & 0x300) >> 2);
reg86.u.b.dh = head;
reg86.u.b.dl = 0x80 + w_drive;
}
r= sys_int86(&reg86);
if (r != OK)
panic(ME, "BIOS call failed", r);
if (reg86.u.w.f & 0x0001) {
/* An error occurred, try again sector by sector unless */
if (++errors == 2) return(EIO);
continue;
}
if (opcode == DEV_GATHER) {
/* Copy from the DMA buffer to user space. */
count = 0;
for (iop = iov; count < nbytes; iop++) {
chunk = iov->iov_size;
if (count + chunk > nbytes) chunk = nbytes - count;
assert(chunk <= rem_buf_size);
r= sys_vircopy(SYSTEM, D, bios_buf_vir+count,
proc_nr, D, iop->iov_addr,
chunk);
if (r != OK)
panic(ME, "sys_vircopy failed", r);
count += chunk;
}
}
/* Book the bytes successfully transferred. */
position += nbytes;
for (;;) {
if (nbytes < iov->iov_size) {
/* Not done with this one yet. */
iov->iov_addr += nbytes;
iov->iov_size -= nbytes;
break;
}
nbytes -= iov->iov_size;
iov->iov_addr += iov->iov_size;
iov->iov_size = 0;
if (nbytes == 0) {
/* The rest is optional, so we return to give FS a
* chance to think it over.
*/
return(OK);
}
iov++;
nr_req--;
}
}
return(OK);
}
/*============================================================================*
* w_do_open *
*============================================================================*/
PRIVATE int w_do_open(dp, m_ptr)
struct driver *dp;
message *m_ptr;
{
/* Device open: Initialize the controller and read the partition table. */
static int init_done = FALSE;
if (!init_done) { w_init(); init_done = TRUE; }
if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
if (w_wn->open_ct++ == 0) {
/* Partition the disk. */
partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY);
}
return(OK);
}
/*============================================================================*
* w_do_close *
*============================================================================*/
PRIVATE int w_do_close(dp, m_ptr)
struct driver *dp;
message *m_ptr;
{
/* Device close: Release a device. */
if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
w_wn->open_ct--;
return(OK);
}
/*===========================================================================*
* w_init *
*===========================================================================*/
PRIVATE void w_init()
{
/* This routine is called at startup to initialize the drive parameters. */
int r, drive;
struct wini *wn;
unsigned long capacity;
struct int13ext_params {
u16_t len;
u16_t flags;
u32_t cylinders;
u32_t heads;
u32_t sectors;
u32_t capacity[2];
u16_t bts_per_sec;
u16_t config[2];
} i13e_par;
struct reg86u reg86;
/* Ask the system task for a suitable buffer */
r= sys_getbiosbuffer(&bios_buf_vir, &bios_buf_size);
if (r != OK)
panic(ME, "sys_getbiosbuffer failed", r);
r= sys_umap(SYSTEM, D, (vir_bytes)bios_buf_vir, (phys_bytes)bios_buf_size,
&bios_buf_phys);
if (r != OK)
panic(ME, "sys_umap failed", r);
if (bios_buf_phys+bios_buf_size > 0x100000)
panic(ME, "bad BIOS buffer, phys", bios_buf_phys);
#if 0
printf("bios_wini: got buffer size %d, virtual 0x%x, phys 0x%x\n",
bios_buf_size, bios_buf_vir, bios_buf_phys);
#endif
/* Get the geometry of the drives */
for (drive = 0; drive < nr_drives; drive++) {
(void) w_prepare(drive * DEV_PER_DRIVE);
wn = w_wn;
reg86.u.b.intno = 0x13;
reg86.u.b.ah = 0x08; /* Get drive parameters. */
reg86.u.b.dl = 0x80 + drive;
r= sys_int86(&reg86);
if (r != OK)
panic(ME, "BIOS call failed", r);
nr_drives = !(reg86.u.w.f & 0x0001) ? reg86.u.b.dl : drive;
if (nr_drives > MAX_DRIVES) nr_drives = MAX_DRIVES;
if (drive >= nr_drives) break;
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 = 0x80 + drive;
if (pc_at) {
r= sys_int86(&reg86);
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 = 0x80 + drive;
reg86.u.w.si = bios_buf_phys % HCLICK_SIZE;
reg86.u.w.ds = bios_buf_phys / HCLICK_SIZE;
r= sys_int86(&reg86);
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;
}
/*============================================================================*
* nop_other *
*============================================================================*/
PRIVATE int nop_other(dp, m_ptr)
struct driver *dp;
message *m_ptr;
{
printf("bios_wini: in nop_other\n");
return OK;
}
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