minix/drivers/bios_wini/bios_wini.c
2010-05-10 13:26:00 +00:00

542 lines
16 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 <minix/drivers.h>
#include <minix/driver.h>
#include <minix/drvlib.h>
#include <minix/sysutil.h>
#include <minix/safecopies.h>
#include <sys/ioc_disk.h>
#include <machine/int86.h>
#include <assert.h>
#define ME "BIOS_WINI"
/* Parameters for the disk drive. */
#define MAX_DRIVES 8 /* this driver supports 8 drives (d0 - d7)*/
#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
_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) );
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) );
/* 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_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 */
};
/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
/*===========================================================================*
* bios_winchester_task *
*===========================================================================*/
PUBLIC int main()
{
/* SEF local startup. */
sef_local_startup();
/* Call the generic receive loop. */
driver_task(&w_dtab, DRIVER_STD);
return(OK);
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *UNUSED(info))
{
/* Initialize the bios_wini driver. */
long v;
v = 0;
env_parse("bios_remap_first", "d", 0, &v, 0, 1);
remap_first = v;
/* Announce we are up! */
driver_announce();
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(NULL);
}
if (w_drive >= MAX_DRIVES || !w_wn->present)
return NULL;
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)
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 */
{
struct wini *wn = w_wn;
iovec_t *iop, *iov_end = iov + nr_req;
int r, errors;
unsigned count;
vir_bytes chunk, nbytes;
unsigned long block;
vir_bytes i13e_rw_off, rem_buf_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;
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 = iop->iov_size;
if (count + chunk > nbytes) chunk = nbytes - count;
assert(chunk <= rem_buf_size);
if(proc_nr != SELF) {
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("copy failed: %d", r);
} else {
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(&reg86);
if (r != OK)
panic("BIOS call failed: %d", 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 = iop->iov_size;
if (count + chunk > nbytes) chunk = nbytes - count;
assert(chunk <= rem_buf_size);
if(proc_nr != SELF) {
r=sys_safecopyto(proc_nr, iop->iov_addr,
0, (vir_bytes) (bios_buf_v+count),
chunk, D);
if (r != OK)
panic("sys_vircopy failed: %d", r);
} else {
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. */
iov->iov_size -= nbytes;
break;
}
nbytes -= 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) == NULL) 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) == NULL) 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("allocating bios buffer failed: %d", ENOMEM);
}
if (bios_buf_phys+BIOSBUF > 0x100000)
panic("bad BIOS buffer / phys: %d", 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(&reg86);
if (r != OK)
panic("BIOS call failed: %d", 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(&reg86);
if (r != OK)
panic("BIOS call failed: %d", 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(&reg86);
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("%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(struct driver *UNUSED(dr), message *m)
{
int r;
if (m->m_type != DEV_IOCTL_S )
return EINVAL;
if (m->REQUEST == DIOCOPENCT) {
int count;
if (w_prepare(m->DEVICE) == NULL) return ENXIO;
count = w_wn->open_ct;
r=sys_safecopyto(m->IO_ENDPT, (cp_grant_id_t)m->IO_GRANT,
0, (vir_bytes)&count, sizeof(count), D);
if(r != OK)
return r;
return OK;
}
return EINVAL;
}