89bf7bae27
remembering the origin and cursor position as that feature didn't really work properly anyway - tty: map in video and font memory using a vm call, access it from C, thereby eliminating pesky weird segment calls and assembly to access it, and unbreaks loadfont (Roman Ignatov) - bios_wini: fix bios_wini by allocating a <1MB buffers for it - memory: preallocate ramdisk, makes it a bit faster (and doesn't fail halfway if you allocate a huge one) - floppy: use <1MB buffer - ramdisk proto: because of the 2x1 page reservations, binaries got a little fatter and didn't fit on the ramdisk any more. increase it.
525 lines
15 KiB
C
525 lines
15 KiB
C
/* 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/safecopies.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 8 /* this driver supports 8 drives (d0 - d7)*/
|
|
#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 drive_id; /* Drive ID at BIOS level */
|
|
int present; /* Valid drive */
|
|
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 w_drive; /* selected drive */
|
|
PRIVATE struct device *w_dv; /* device's base and size */
|
|
PRIVATE char *bios_buf_v;
|
|
PRIVATE phys_bytes bios_buf_phys;
|
|
PRIVATE int remap_first = 0; /* Remap drives for CD HD emulation */
|
|
#define BIOSBUF 16384
|
|
PRIVATE cp_grant_id_t my_bios_grant_id;
|
|
|
|
_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, u64_t position,
|
|
iovec_t *iov, unsigned nr_req, int safe) );
|
|
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 w_other, (struct driver *dp, message *m_ptr, int) );
|
|
|
|
/* 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 */
|
|
w_other, /* catch-all for unrecognized commands and ioctls */
|
|
NULL /* leftover hardware interrupts */
|
|
};
|
|
|
|
/*===========================================================================*
|
|
* bios_winchester_task *
|
|
*===========================================================================*/
|
|
PUBLIC int main()
|
|
{
|
|
long v;
|
|
|
|
v= 0;
|
|
env_parse("bios_remap_first", "d", 0, &v, 0, 1);
|
|
remap_first= v;
|
|
|
|
/* Set special disk parameters then call the generic main loop. */
|
|
driver_task(&w_dtab);
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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);
|
|
}
|
|
if (w_drive >= MAX_DRIVES || !w_wn->present)
|
|
return NIL_DEV;
|
|
return(w_dv);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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, pos64, iov, nr_req, safe)
|
|
int proc_nr; /* process doing the request */
|
|
int opcode; /* DEV_GATHER or DEV_SCATTER */
|
|
u64_t pos64; /* offset on device to read or write */
|
|
iovec_t *iov; /* pointer to read or write request vector */
|
|
unsigned nr_req; /* length of request vector */
|
|
int safe; /* use safecopies? */
|
|
{
|
|
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;
|
|
size_t vir_offset = 0;
|
|
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;
|
|
u32_t lopos;
|
|
|
|
lopos= ex64lo(pos64);
|
|
|
|
/* Check disk address. */
|
|
if ((lopos & SECTOR_MASK) != 0) return(EINVAL);
|
|
|
|
errors = 0;
|
|
|
|
i13e_rw_off= BIOSBUF-sizeof(*i13e_rw);
|
|
rem_buf_size= (i13e_rw_off & ~SECTOR_MASK);
|
|
i13e_rw = (struct int13ext_rw *) (bios_buf_v + i13e_rw_off);
|
|
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 (cmp64(pos64, w_dv->dv_size) >= 0) return(OK); /* At EOF */
|
|
if (cmp64(add64u(pos64, nbytes), w_dv->dv_size) > 0) {
|
|
u64_t n;
|
|
n = sub64(w_dv->dv_size, pos64);
|
|
assert(ex64hi(n) == 0);
|
|
nbytes = ex64lo(n);
|
|
}
|
|
block = div64u(add64(w_dv->dv_base, pos64), SECTOR_SIZE);
|
|
|
|
/* Degrade to per-sector mode if there were errors. */
|
|
if (errors > 0) nbytes = SECTOR_SIZE;
|
|
|
|
if (opcode == DEV_SCATTER_S) {
|
|
/* 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);
|
|
|
|
if(safe) {
|
|
r=sys_safecopyfrom(proc_nr,
|
|
(cp_grant_id_t) iop->iov_addr,
|
|
0, (vir_bytes) (bios_buf_v+count),
|
|
chunk, D);
|
|
if (r != OK)
|
|
panic(ME, "copy failed", r);
|
|
} else {
|
|
if(proc_nr != SELF) {
|
|
panic(ME, "unsafe outside self", r);
|
|
}
|
|
memcpy(bios_buf_v+count,
|
|
(char *) iop->iov_addr, chunk);
|
|
}
|
|
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;
|
|
|
|
/* Set up an extended read or write BIOS call. */
|
|
reg86.u.b.intno = 0x13;
|
|
reg86.u.w.ax = opcode == DEV_SCATTER_S ? 0x4300 : 0x4200;
|
|
reg86.u.b.dl = wn->drive_id;
|
|
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_S ? 0x03 : 0x02;
|
|
reg86.u.b.al = nbytes >> SECTOR_SHIFT;
|
|
reg86.u.w.bx = bios_buf_phys % HCLICK_SIZE;
|
|
reg86.u.w.es = bios_buf_phys / 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 = wn->drive_id;
|
|
}
|
|
|
|
r= sys_int86(®86);
|
|
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_S) {
|
|
/* 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);
|
|
|
|
if(safe) {
|
|
r=sys_safecopyto(proc_nr, iop->iov_addr,
|
|
0, (vir_bytes) (bios_buf_v+count), chunk, D);
|
|
|
|
if (r != OK)
|
|
panic(ME, "sys_vircopy failed", r);
|
|
} else {
|
|
if (proc_nr != SELF)
|
|
panic(ME, "unsafe without self", NO_NUM);
|
|
memcpy((char *) iop->iov_addr,
|
|
bios_buf_v+count, chunk);
|
|
}
|
|
count += chunk;
|
|
}
|
|
}
|
|
|
|
/* Book the bytes successfully transferred. */
|
|
pos64 = add64ul(pos64, nbytes);
|
|
for (;;) {
|
|
if (nbytes < iov->iov_size) {
|
|
/* Not done with this one yet. */
|
|
vir_offset += nbytes;
|
|
iov->iov_size -= nbytes;
|
|
break;
|
|
}
|
|
nbytes -= iov->iov_size;
|
|
vir_offset = 0;
|
|
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, 0);
|
|
}
|
|
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, drive_id, nr_drives;
|
|
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 */
|
|
if(!(bios_buf_v = alloc_contig(BIOSBUF, AC_LOWER1M, &bios_buf_phys))) {
|
|
panic(ME, "allocating bios buffer failed", r);
|
|
}
|
|
|
|
if (bios_buf_phys+BIOSBUF > 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",
|
|
BIOSBUF, bios_buf_v, bios_buf_phys);
|
|
#endif
|
|
|
|
i13e_par = (struct int13ext_params *) bios_buf_v;
|
|
|
|
/* Get the geometry of the drives */
|
|
for (drive = 0; drive < MAX_DRIVES; drive++) {
|
|
if (remap_first)
|
|
{
|
|
if (drive == 7)
|
|
drive_id= 0x80;
|
|
else
|
|
drive_id= 0x80 + drive + 1;
|
|
}
|
|
else
|
|
drive_id= 0x80 + drive;
|
|
|
|
(void) w_prepare(drive * DEV_PER_DRIVE);
|
|
wn = w_wn;
|
|
wn->drive_id= drive_id;
|
|
|
|
reg86.u.b.intno = 0x13;
|
|
reg86.u.b.ah = 0x08; /* Get drive parameters. */
|
|
reg86.u.b.dl = drive_id;
|
|
r= sys_int86(®86);
|
|
if (r != OK)
|
|
panic(ME, "BIOS call failed", r);
|
|
|
|
nr_drives = !(reg86.u.w.f & 0x0001) ? reg86.u.b.dl : drive;
|
|
if (drive_id >= 0x80 + nr_drives) continue;
|
|
wn->present= 1;
|
|
|
|
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 */
|
|
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);
|
|
|
|
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_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;
|
|
}
|
|
|