ref: f8935b5778397074d41a48205e5c7f87d7b531fe
dir: /os/boot/mpc/main.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "dosfs.h"
typedef struct Type Type;
typedef struct Medium Medium;
typedef struct Mode Mode;
enum {
Dany = -1,
Nmedia = 16,
/* DS1 switch options */
Sflashfs = 1<<0, /* take local fs from flash */
Snotflash = 1<<1, /* don't boot from flash */
};
enum { /* type */
Tflash,
Tuart,
Tether,
Thard,
Tany = -1,
};
enum { /* flag and name */
Fnone = 0x00,
Fdos = 0x01,
Ndos = 0x00,
Fboot = 0x02,
Nboot = 0x01,
Fbootp = 0x04,
Nbootp = 0x02,
Fflash = 0x08,
Fuart = 0x10,
NName = 0x03,
Fany = Fbootp|Fboot|Fdos|Fflash|Fuart,
Fini = 0x10,
Fprobe = 0x80,
};
enum { /* mode */
Mauto = 0x00,
Mlocal = 0x01,
Manual = 0x02,
NMode = 0x03,
};
typedef struct Type {
int type;
char *cname;
int flag;
int (*init)(void);
long (*read)(int, void*, long);
long (*seek)(int, long);
Partition* (*setpart)(int, char*);
char* name[NName];
int mask;
Medium* media;
} Type;
typedef struct Medium {
Type* type;
int flag;
Partition* partition;
Dos;
Medium* next;
} Medium;
typedef struct Mode {
char* name;
int mode;
} Mode;
static Type types[] = {
{ Tflash, "flash",
Fflash,
flashinit, 0, 0, 0,
{ 0, "F", 0, }
},
/*
{ Tuart, "uart",
Fuart|Fboot,
uartinit, uartread, uartseek, setuartpart,
{ 0, "u", 0, }
},
*/
{ Tether, "ether",
Fbootp,
etherinit, 0, 0, 0,
{ 0, 0, "e", },
},
{ Thard, "ata",
Fini|Fboot|Fdos,
0, 0, 0, 0, /* not used now, will be later with PCMCIA */
{ "hd", "h", 0, },
},
{-1},
};
static Medium media[Nmedia];
static Medium *curmedium = media;
static Mode modes[NMode+1] = {
[Mauto] { "auto", Mauto, },
[Mlocal] { "local", Mlocal, },
[Manual] { "manual", Manual, },
};
static char *inis[] = {
"inferno/inferno.ini",
"inferno.ini",
"plan9/plan9.ini",
"plan9.ini",
0,
};
char **ini;
int predawn;
static int
parse(char *line, int *type, int *flag, int *dev, char *file)
{
Type *tp;
char buf[2*NAMELEN], *v[4], *p;
int i;
strcpy(buf, line);
switch(getcfields(buf, v, 4, "!")){
case 3:
break;
case 2:
v[2] = "";
break;
default:
return 0;
}
*flag = 0;
for(tp = types; tp->cname; tp++){
for(i = 0; i < NName; i++){
if(tp->name[i] == 0 || strcmp(v[0], tp->name[i]))
continue;
*type = tp->type;
*flag |= 1<<i;
if((*dev = strtoul(v[1], &p, 0)) == 0 && p == v[1])
return 0;
strcpy(file, v[2]);
return 1;
}
}
return 0;
}
static int
boot(Medium *mp, int flag, char *file)
{
Dosfile df;
char ixdos[128], *p;
int r;
uartsetboot(0);
if(flag & Fbootp){
sprint(BOOTLINE, "%s!%d", mp->type->name[Nbootp], mp->dev);
return bootp(mp->dev, file);
}
if(flag & Fflash){
if(mp->flag & Fflash && flashbootable(0))
flashboot(mp->dev);
}
if(flag & Fboot){
if(mp->flag & Fini){
(*mp->type->setpart)(mp->dev, "disk");
plan9ini(mp, nil);
}
if(file == 0 || *file == 0)
file = mp->partition->name;
(*mp->type->setpart)(mp->dev, file);
sprint(BOOTLINE, "%s!%d!%s", mp->type->name[Nboot], mp->dev, file);
r = plan9boot(mp->dev, mp->seek, mp->read);
uartsetboot(0);
return r;
}
if(flag & Fdos){
if(mp->type->setpart)
(*mp->type->setpart)(mp->dev, "disk");
if(mp->flag & Fini)
plan9ini(mp, nil);
if(file == 0 || *file == 0){
strcpy(ixdos, *ini);
if(p = strrchr(ixdos, '/'))
p++;
else
p = ixdos;
strcpy(p, "impc");
if(dosstat(mp, ixdos, &df) <= 0)
return -1;
}
else
strcpy(ixdos, file);
sprint(BOOTLINE, "%s!%d!%s", mp->type->name[Ndos], mp->dev, ixdos);
return dosboot(mp, ixdos);
}
return -1;
}
static Medium*
allocm(Type *tp)
{
Medium **l;
if(curmedium >= &media[Nmedia])
return 0;
for(l = &tp->media; *l; l = &(*l)->next)
;
*l = curmedium++;
return *l;
}
Medium*
probe(int type, int flag, int dev)
{
Type *tp;
int dombr, i, start;
Medium *mp;
Dosfile df;
Partition *pp;
for(tp = types; tp->cname; tp++){
if(type != Tany && type != tp->type || tp->init == 0)
continue;
if(flag != Fnone){
for(mp = tp->media; mp; mp = mp->next){
if((flag & mp->flag) && (dev == Dany || dev == mp->dev))
return mp;
}
}
if((tp->flag & Fprobe) == 0){
tp->flag |= Fprobe;
tp->mask = (*tp->init)();
}
for(i = 0; tp->mask; i++){
if((tp->mask & (1<<i)) == 0)
continue;
tp->mask &= ~(1<<i);
if((mp = allocm(tp)) == 0)
continue;
mp->dev = i;
mp->flag = tp->flag;
mp->seek = tp->seek;
mp->read = tp->read;
mp->type = tp;
if(mp->flag & Fboot){
if((mp->partition = (*tp->setpart)(i, "boot")) == 0)
mp->flag &= ~Fboot;
if((mp->flag & (Fflash|Fuart)) == 0)
(*tp->setpart)(i, "disk");
}
if(mp->flag & Fdos){
start = 0;
dombr = 1;
if(mp->type->setpart){
if(pp = (*mp->type->setpart)(i, "dos")){
if(start = pp->start)
dombr = 0;
}
(*tp->setpart)(i, "disk");
}
if(dosinit(mp, start, dombr) < 0)
mp->flag &= ~(Fini|Fdos);
else
print("dos init failed\n");
}
if(mp->flag & Fini){
mp->flag &= ~Fini;
for(ini = inis; *ini; ini++){
if(dosstat(mp, *ini, &df) <= 0)
continue;
mp->flag |= Fini;
break;
}
}
if((flag & mp->flag) && (dev == Dany || dev == i))
return mp;
}
}
return 0;
}
void
main(void)
{
Medium *mp;
int dev, flag, i, mode, tried, type, options;
char def[2*NAMELEN], file[2*NAMELEN], line[80], *p;
Type *tp;
machinit();
archinit();
meminit();
cpminit();
trapinit();
consinit(); /* screen and keyboard initially */
screeninit();
cpuidprint();
alarminit();
clockinit();
predawn = 0;
spllo();
options = archoptionsw();
mp = 0;
for(tp = types; tp->cname; tp++){
if(tp->type == Tether)
continue;
if((mp = probe(tp->type, Fini, Dany)) && (mp->flag & Fini)){
plan9ini(mp, nil);
break;
}
}
if(mp == 0 || (mp->flag & Fini) == 0)
plan9ini(nil, flashconfig(0));
//consinit(); /* establish new console location */
if((options & Snotflash) == 0 && flashbootable(0)){
print("Flash boot\n");
flashboot(0);
}
tried = 0;
mode = Mauto;
p = getconf("bootfile");
flag = 0;
if(p != 0) {
mode = Manual;
for(i = 0; i < NMode; i++){
if(strcmp(p, modes[i].name) == 0){
mode = modes[i].mode;
goto done;
}
}
if(parse(p, &type, &flag, &dev, file) == 0) {
print("Bad bootfile syntax: %s\n", p);
goto done;
}
mp = probe(type, flag, dev);
if(mp == 0) {
print("Cannot access device: %s\n", p);
goto done;
}
tried = boot(mp, flag, file);
}
done:
if(tried == 0 && mode != Manual){
flag = Fany;
if(mode == Mlocal)
flag &= ~Fbootp;
if(options & Snotflash)
flag &= ~Fflash;
if((mp = probe(Tany, flag, Dany)) != 0)
boot(mp, flag & mp->flag, 0);
}
def[0] = 0;
probe(Tany, Fnone, Dany);
flag = 0;
for(tp = types; tp->cname; tp++){
for(mp = tp->media; mp; mp = mp->next){
if(flag == 0){
flag = 1;
print("Boot devices:");
}
if(mp->flag & Fbootp)
print(" %s!%d", mp->type->name[Nbootp], mp->dev);
if(mp->flag & Fdos)
print(" %s!%d", mp->type->name[Ndos], mp->dev);
if(mp->flag & (Fflash|Fuart) || mp->flag & Fboot)
print(" %s!%d", mp->type->name[Nboot], mp->dev);
}
}
if(flag)
print("\n");
for(;;){
if(getstr("boot from", line, sizeof(line), def) >= 0){
if(parse(line, &type, &flag, &dev, file)){
if(mp = probe(type, flag, dev))
boot(mp, flag, file);
}
}
def[0] = 0;
}
}
void
machinit(void)
{
memset(m, 0, sizeof(*m));
m->delayloop = 20000;
m->cpupvr = getpvr();
m->iomem = KADDR(INTMEM);
}
int
getcfields(char* lp, char** fields, int n, char* sep)
{
int i;
for(i = 0; lp && *lp && i < n; i++){
while(*lp && strchr(sep, *lp) != 0)
*lp++ = 0;
if(*lp == 0)
break;
fields[i] = lp;
while(*lp && strchr(sep, *lp) == 0){
if(*lp == '\\' && *(lp+1) == '\n')
*lp++ = ' ';
lp++;
}
}
return i;
}
static Map memv[512];
static RMap rammap = {"physical memory"};
void
meminit(void)
{
ulong e;
mapinit(&rammap, memv, sizeof(memv));
e = PADDR(&end);
mapfree(&rammap, e, 4*1024*1024-e); /* fixed 4Mbytes is plenty for bootstrap */
}
void*
ialloc(ulong n, int align)
{
ulong a;
int s;
if(align <= 0)
align = 4;
s = splhi();
a = mapalloc(&rammap, 0, n, align);
splx(s);
if(a == 0)
panic("ialloc");
return memset(KADDR(a), 0, n);
}
void*
malloc(ulong n)
{
ulong *p;
n = ((n+sizeof(int)-1)&~(sizeof(int)-1))+2*sizeof(int);
p = ialloc(n, sizeof(int));
*p++ = 0xcafebeef;
*p++ = n;
return p;
}
void
free(void *ap)
{
int s;
ulong *p;
p = ap;
if(p){
if(*(p -= 2) != 0xcafebeef)
panic("free");
s = splhi();
mapfree(&rammap, (ulong)p, p[1]);
splx(s);
}
}
void
sched(void)
{
}