ref: da7d6df6faf18e289fe0f3f61524dcc7fddeef18
dir: /os/boot/pc/devsd.c/
/*
* Storage Device.
*/
#include "u.h"
#include "mem.h"
#include "lib.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "error.h"
#include "sd.h"
#include "fs.h"
#define parttrace 0
extern SDifc* sdifc[];
static SDev* sdlist;
static SDunit** sdunit;
static int sdnunit;
static int _sdmask;
static int cdmask;
static int sdmask;
enum {
Rawcmd,
Rawdata,
Rawstatus,
};
void
sdaddpart(SDunit* unit, char* name, uvlong start, uvlong end)
{
SDpart *pp;
int i, partno;
if(parttrace)
print("add %d %s %s %lld %lld\n", unit->npart, unit->name, name, start, end);
/*
* Check name not already used
* and look for a free slot.
*/
if(unit->part != nil){
partno = -1;
for(i = 0; i < SDnpart; i++){
pp = &unit->part[i];
if(!pp->valid){
if(partno == -1)
partno = i;
break;
}
if(strcmp(name, pp->name) == 0){
if(pp->start == start && pp->end == end){
if(parttrace)
print("already present\n");
return;
}
}
}
}else{
if((unit->part = malloc(sizeof(SDpart)*SDnpart)) == nil){
if(parttrace)
print("malloc failed\n");
return;
}
partno = 0;
}
/*
* Check there is a free slot and size and extent are valid.
*/
if(partno == -1 || start > end || end > unit->sectors){
print("cannot add %s!%s [%llud,%llud) to disk [0,%llud): %s\n",
unit->name, name, start, end, unit->sectors,
partno==-1 ? "no free partitions" : "partition boundaries out of range");
return;
}
pp = &unit->part[partno];
pp->start = start;
pp->end = end;
strncpy(pp->name, name, NAMELEN);
pp->valid = 1;
unit->npart++;
}
void
sddelpart(SDunit* unit, char* name)
{
int i;
SDpart *pp;
if(parttrace)
print("del %d %s %s\n", unit->npart, unit->name, name);
/*
* Look for the partition to delete.
* Can't delete if someone still has it open.
* If it's the last valid partition zap the
* whole table.
*/
pp = unit->part;
for(i = 0; i < SDnpart; i++){
if(strncmp(name, pp->name, NAMELEN) == 0)
break;
pp++;
}
if(i >= SDnpart)
return;
pp->valid = 0;
unit->npart--;
if(unit->npart == 0){
free(unit->part);
unit->part = nil;
}
}
static int
sdinitpart(SDunit* unit)
{
unit->sectors = unit->secsize = 0;
unit->npart = 0;
if(unit->part){
free(unit->part);
unit->part = nil;
}
if(unit->inquiry[0] & 0xC0)
return 0;
switch(unit->inquiry[0] & 0x1F){
case 0x00: /* DA */
case 0x04: /* WORM */
case 0x05: /* CD-ROM */
case 0x07: /* MO */
break;
default:
return 0;
}
if(unit->dev->ifc->online == nil || unit->dev->ifc->online(unit) == 0)
return 0;
sdaddpart(unit, "data", 0, unit->sectors);
return 1;
}
static SDunit*
sdgetunit(SDev* sdev, int subno)
{
int index;
SDunit *unit;
/*
* Associate a unit with a given device and sub-unit
* number on that device.
* The device will be probed if it has not already been
* successfully accessed.
*/
qlock(&sdqlock);
index = sdev->index+subno;
unit = sdunit[index];
if(unit == nil){
if((unit = malloc(sizeof(SDunit))) == nil){
qunlock(&sdqlock);
return nil;
}
if(sdev->enabled == 0 && sdev->ifc->enable)
sdev->ifc->enable(sdev);
sdev->enabled = 1;
snprint(unit->name, NAMELEN, "sd%c%d", sdev->idno, subno);
unit->subno = subno;
unit->dev = sdev;
/*
* No need to lock anything here as this is only
* called before the unit is made available in the
* sdunit[] array.
*/
if(unit->dev->ifc->verify(unit) == 0){
qunlock(&sdqlock);
free(unit);
return nil;
}
sdunit[index] = unit;
}
qunlock(&sdqlock);
return unit;
}
static SDunit*
sdindex2unit(int index)
{
SDev *sdev;
/*
* Associate a unit with a given index into the top-level
* device directory.
* The device will be probed if it has not already been
* successfully accessed.
*/
for(sdev = sdlist; sdev != nil; sdev = sdev->next){
if(index >= sdev->index && index < sdev->index+sdev->nunit)
return sdgetunit(sdev, index-sdev->index);
}
return nil;
}
static void
_sddetach(void)
{
SDev *sdev;
for(sdev = sdlist; sdev != nil; sdev = sdev->next){
if(sdev->enabled == 0)
continue;
if(sdev->ifc->disable)
sdev->ifc->disable(sdev);
sdev->enabled = 0;
}
}
static void
sddump(void)
{
SDev *sdev;
print("sdevs:\n");
for(sdev = sdlist; sdev != nil; sdev = sdev->next){
print("sdev %c index %d nunit %d: ",
sdev->idno, sdev->index, sdev->nunit);
print("\n");
}
}
static int
_sdinit(void)
{
ulong m;
int i;
SDev *sdev, *tail;
SDunit *unit;
/*
* Probe all configured controllers and make a list
* of devices found, accumulating a possible maximum number
* of units attached and marking each device with an index
* into the linear top-level directory array of units.
*/
tail = nil;
for(i = 0; sdifc[i] != nil; i++){
if((sdev = sdifc[i]->pnp()) == nil)
continue;
if(sdlist != nil)
tail->next = sdev;
else
sdlist = sdev;
for(tail = sdev; tail->next != nil; tail = tail->next){
tail->index = sdnunit;
sdnunit += tail->nunit;
}
tail->index = sdnunit;
sdnunit += tail->nunit;
}
/*
* Legacy and option code goes here. This will be hard...
*/
/*
* The maximum number of possible units is known, allocate
* placeholders for their datastructures; the units will be
* probed and structures allocated when attached.
* Allocate controller names for the different types.
*/
if(sdnunit == 0)
return 0;
if((sdunit = malloc(sdnunit*sizeof(SDunit*))) == nil)
return 0;
sddetach = _sddetach;
for(i = 0; sdifc[i] != nil; i++){
if(sdifc[i]->id)
sdifc[i]->id(sdlist);
}
if (0)
sddump();
m = 0;
cdmask = sdmask = 0;
for(i=0; i<sdnunit && i < 32; i++) {
unit = sdindex2unit(i);
if(unit == nil)
continue;
sdinitpart(unit);
partition(unit);
if(unit->npart > 0){ /* BUG */
if((unit->inquiry[0] & 0x1F) == 0x05)
cdmask |= (1<<i);
else
sdmask |= (1<<i);
m |= (1<<i);
}
}
//notesdinfo();
_sdmask = m;
return m;
}
int
cdinit(void)
{
if(sdnunit == 0)
_sdinit();
return cdmask;
}
int
sdinit(void)
{
if(sdnunit == 0)
_sdinit();
return sdmask;
}
void
sdinitdev(int i, char *s)
{
SDunit *unit;
unit = sdindex2unit(i);
strcpy(s, unit->name);
}
void
sdprintdevs(int i)
{
char *s;
SDunit *unit;
unit = sdindex2unit(i);
for(i=0; i<unit->npart; i++){
s = unit->part[i].name;
if(strncmp(s, "dos", 3) == 0
|| strncmp(s, "9fat", 4) == 0
|| strncmp(s, "fs", 2) == 0)
print(" %s!%s", unit->name, s);
}
}
SDpart*
sdfindpart(SDunit *unit, char *name)
{
int i;
if(parttrace)
print("findpart %d %s %s\t\n", unit->npart, unit->name, name);
for(i=0; i<unit->npart; i++) {
if(parttrace)
print("%s...", unit->part[i].name);
if(strcmp(unit->part[i].name, name) == 0){
if(parttrace)
print("\n");
return &unit->part[i];
}
}
if(parttrace)
print("not found\n");
return nil;
}
typedef struct Scsicrud Scsicrud;
struct Scsicrud {
Fs fs;
vlong offset;
SDunit *unit;
SDpart *part;
};
long
sdread(Fs *vcrud, void *v, long n)
{
Scsicrud *crud;
long x;
crud = (Scsicrud*)vcrud;
x = sdbio(crud->unit, crud->part, v, n, crud->offset);
if(x > 0)
crud->offset += x;
return x;
}
vlong
sdseek(Fs *vcrud, vlong seek)
{
((Scsicrud*)vcrud)->offset = seek;
return seek;
}
void*
sdgetfspart(int i, char *s, int chatty)
{
SDunit *unit;
SDpart *p;
Scsicrud *crud;
if(cdmask&(1<<i)){
if(strcmp(s, "cdboot") != 0)
return nil;
}else if(sdmask&(1<<i)){
if(strcmp(s, "cdboot") == 0)
return nil;
}
unit = sdindex2unit(i);
if((p = sdfindpart(unit, s)) == nil){
if(chatty)
print("unknown partition %s!%s\n", unit->name, s);
return nil;
}
if(p->crud == nil) {
crud = malloc(sizeof(Scsicrud));
crud->fs.dev = i;
crud->fs.diskread = sdread;
crud->fs.diskseek = sdseek;
// crud->start = 0;
crud->unit = unit;
crud->part = p;
if(dosinit(&crud->fs) < 0 && dosinit(&crud->fs) < 0 && kfsinit(&crud->fs) < 0){
if(chatty)
print("partition %s!%s does not contain a DOS or KFS file system\n",
unit->name, s);
return nil;
}
p->crud = crud;
}
return p->crud;
}
/*
* Leave partitions around for devsd to pick up.
* (Needed by boot process; more extensive
* partitioning is done by termrc or cpurc).
*/
void
sdaddconf(int i)
{
SDunit *unit;
SDpart *pp;
unit = sdindex2unit(i);
/*
* If there were no partitions (just data and partition), don't bother.
*/
if(unit->npart<= 1 || (unit->npart==2 && strcmp(unit->part[1].name, "partition")==0))
return;
addconf("%spart=", unit->name);
for(i=1, pp=&unit->part[i]; i<unit->npart; i++, pp++) /* skip 0, which is "data" */
addconf("%s%s %lld %lld", i==1 ? "" : "/", pp->name,
pp->start, pp->end);
addconf("\n");
}
int
sdboot(int dev, char *pname, Boot *b)
{
char *file;
Fs *fs;
if((file = strchr(pname, '!')) == nil) {
print("syntax is sdC0!partition!file\n");
return -1;
}
*file++ = '\0';
fs = sdgetfspart(dev, pname, 1);
if(fs == nil)
return -1;
return fsboot(fs, file, b);
}
long
sdbio(SDunit *unit, SDpart *pp, void* va, long len, vlong off)
{
long l;
ulong bno, max, nb, offset;
static uchar *b;
char *a;
static ulong bsz;
a = va;
memset(a, 0xDA, len);
qlock(&unit->ctl);
if(unit->changed){
qunlock(&unit->ctl);
return 0;
}
/*
* Check the request is within bounds.
* Removeable drives are locked throughout the I/O
* in case the media changes unexpectedly.
* Non-removeable drives are not locked during the I/O
* to allow the hardware to optimise if it can; this is
* a little fast and loose.
* It's assumed that non-removable media parameters
* (sectors, secsize) can't change once the drive has
* been brought online.
*/
bno = (off/unit->secsize) + pp->start;
nb = ((off+len+unit->secsize-1)/unit->secsize) + pp->start - bno;
max = SDmaxio/unit->secsize;
if(nb > max)
nb = max;
if(bno+nb > pp->end)
nb = pp->end - bno;
if(bno >= pp->end || nb == 0){
qunlock(&unit->ctl);
return 0;
}
if(!(unit->inquiry[1] & 0x80))
qunlock(&unit->ctl);
if(bsz < nb*unit->secsize){
b = malloc(nb*unit->secsize);
bsz = nb*unit->secsize;
}
// b = sdmalloc(nb*unit->secsize);
// if(b == nil)
// return 0;
offset = off%unit->secsize;
if((l = unit->dev->ifc->bio(unit, 0, 0, b, nb, bno)) < 0) {
// sdfree(b);
return 0;
}
if(l < offset)
len = 0;
else if(len > l - offset)
len = l - offset;
if(len)
memmove(a, b+offset, len);
// sdfree(b);
if(unit->inquiry[1] & 0x80)
qunlock(&unit->ctl);
return len;
}
#ifdef DMA
long
sdrio(SDreq *r, void* a, long n)
{
if(n >= SDmaxio || n < 0)
return 0;
r->data = nil;
if(n){
if((r->data = malloc(n)) == nil)
return 0;
if(r->write)
memmove(r->data, a, n);
}
r->dlen = n;
if(r->unit->dev->ifc->rio(r) != SDok){
// cgascreenputs("1", 1);
if(r->data != nil){
sdfree(r->data);
r->data = nil;
}
return 0;
}
// cgascreenputs("2", 1);
if(!r->write && r->rlen > 0)
memmove(a, r->data, r->rlen);
// cgascreenputs("3", 1);
if(r->data != nil){
sdfree(r->data);
r->data = nil;
}
// cgascreenputs("4", 1);
return r->rlen;
}
#endif /* DMA */
void
sleep(void*, int (*fn)(void*), void *v)
{
int x;
x = spllo();
while(!fn(v))
;
splx(x);
return;
}
void
tsleep(void*, int (*fn)(void*), void *v, int msec)
{
int x;
ulong start;
x = spllo();
for(start = m->ticks; TK2MS(m->ticks - start) < msec
&& !fn(v); )
;
splx(x);
return;
}
void*
sdmalloc(void *p, ulong sz)
{
if(p != nil) {
memset(p, 0, sz);
return p;
}
return malloc(sz);
}