ref: f0b565742993646ac2c7939e3a89f44c2515fbe6
dir: /os/boot/pc/load.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "sd.h"
#include "fs.h"
#ifndef VERBOSE
#define VERBOSE 0
#endif
/*
* "cache" must be in this list so that 9load will pass the definition of
* the cache partition into the kernel so that the disk named by the `cfs'
* variable in plan9.ini can be seen in all circumstances before termrc
* sets up all the disk partitions. In particular, if it's on an odd-ball
* disk like sd10 rather than sdC0, this is needed.
*/
static char *diskparts[] = {
"dos", "9fat", "fs", "data", "cdboot", "cache", 0
};
static char *etherparts[] = { "*", 0 };
static char *diskinis[] = {
"plan9/plan9.ini",
"plan9.ini",
0
};
static char *etherinis[] = {
"/cfg/pxe/%E",
0
};
/* ordering: devbios must be called before devsd calls sdbios */
Type types[] = {
{ Tfloppy,
Fini|Ffs,
floppyinit, floppyinitdev,
floppygetfspart, 0, floppyboot,
floppyprintdevs,
diskparts,
diskinis,
},
{ Tether,
Fini|Fbootp,
etherinit, etherinitdev,
pxegetfspart, 0, bootpboot,
etherprintdevs,
etherparts,
etherinis,
},
{ Tbios,
Fini|Ffs,
biosinit, biosinitdev,
biosgetfspart, nil, biosboot,
biosprintdevs,
diskparts,
diskinis,
},
{ Tcd,
Fini|Ffs,
cdinit, sdinitdev,
sdgetfspart, sdaddconf, sdboot,
sdprintdevs,
diskparts,
diskinis,
},
{ Tsd,
Fini|Ffs,
sdinit, sdinitdev,
sdgetfspart, sdaddconf, sdboot,
sdprintdevs,
diskparts,
diskinis,
},
{ Tnil,
0,
nil, nil, nil, nil, nil, nil,
nil,
nil,
0,
nil,
},
};
static char *typenm[] = {
[Tnil] "nil",
[Tfloppy] "floppy",
[Tsd] "sd",
[Tether] "ether",
[Tcd] "cd",
[Tbios] "bios",
};
static char *
typename(int type)
{
if (type < 0 || type >= nelem(typenm) || typenm[type] == nil)
return "**gok**";
return typenm[type];
}
extern SDifc sdataifc;
extern SDifc sdiahciifc;
extern SDifc sdaoeifc;
extern SDifc sdbiosifc;
#ifdef NOSCSI
SDifc* sdifc[] = {
&sdataifc,
&sdiahciifc,
&sdbiosifc,
&sdaoeifc,
nil,
};
#else
extern SDifc sdmylexifc;
extern SDifc sd53c8xxifc;
SDifc* sdifc[] = {
&sdataifc,
&sdiahciifc,
&sdmylexifc,
&sd53c8xxifc,
&sdbiosifc,
&sdaoeifc,
nil,
};
#endif NOSCSI
typedef struct Mode Mode;
enum {
Maxdev = 7,
Dany = -1,
Nmedia = 16,
Nini = 10,
};
enum { /* mode */
Mauto = 0x00,
Mlocal = 0x01,
Manual = 0x02,
NMode = 0x03,
};
typedef struct Medium Medium;
struct Medium {
Type* type;
int flag;
int dev;
char name[NAMELEN];
Fs *inifs;
char *part;
char *ini;
Medium* next;
};
typedef struct Mode {
char* name;
int mode;
} Mode;
static Medium media[Nmedia];
static Medium *curmedium = media;
static Mode modes[NMode+1] = {
[Mauto] { "auto", Mauto, },
[Mlocal] { "local", Mlocal, },
[Manual] { "manual", Manual, },
};
char **ini;
int scsi0port;
char *defaultpartition;
int iniread;
int debugload;
static Medium*
parse(char *line, char **file)
{
char *p;
Type *tp;
Medium *mp;
if(p = strchr(line, '!')) {
*p++ = 0;
*file = p;
} else
*file = "";
for(tp = types; tp->type != Tnil; tp++)
for(mp = tp->media; mp; mp = mp->next)
if(strcmp(mp->name, line) == 0)
return mp;
if(p)
*--p = '!';
return nil;
}
static int
boot(Medium *mp, char *file)
{
Type *tp;
Medium *xmp;
static int didaddconf;
Boot b;
memset(&b, 0, sizeof b);
b.state = INITKERNEL;
if(didaddconf == 0) {
didaddconf = 1;
for(tp = types; tp->type != Tnil; tp++)
if(tp->addconf)
for(xmp = tp->media; xmp; xmp = xmp->next)
(*tp->addconf)(xmp->dev);
}
sprint(BOOTLINE, "%s!%s", mp->name, file);
print("booting %s!%s\n", mp->name, file);
return (*mp->type->boot)(mp->dev, file, &b);
}
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 i;
Medium *mp;
File f;
Fs *fs;
char **partp;
for(tp = types; tp->type != Tnil; tp++){
if(type != Tany && type != tp->type)
continue;
if(flag != Fnone){
for(mp = tp->media; mp; mp = mp->next){
if((flag & mp->flag) && (dev == Dany || dev == mp->dev))
return mp;
}
}
if (debugload)
print("probing %s...", typename(tp->type));
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->type = tp;
(*tp->initdev)(i, mp->name);
if(mp->flag & Fini){
mp->flag &= ~Fini;
for(partp = tp->parts; *partp; partp++){
if((fs = (*tp->getfspart)(i, *partp, 0)) == nil)
continue;
for(ini = tp->inis; *ini; ini++){
if(fswalk(fs, *ini, &f) > 0){
mp->inifs = fs;
mp->part = *partp;
mp->ini = f.path;
mp->flag |= Fini;
goto Break2;
}
}
}
}
Break2:
if((flag & mp->flag) && (dev == Dany || dev == i))
return mp;
}
}
return 0;
}
void
main(void)
{
Medium *mp;
int flag, i, mode, tried;
char def[2*NAMELEN], line[80], *p, *file;
Type *tp;
i8042a20();
memset(m, 0, sizeof(Mach));
trapinit();
clockinit();
alarminit();
meminit(0);
spllo();
consinit("0", "9600");
kbdinit();
if((ulong)&end > (KZERO|(640*1024)))
panic("i'm too big\n");
readlsconf();
print("initial probe, to find plan9.ini...");
/* find and read plan9.ini, setting configuration variables */
for(tp = types; tp->type != Tnil; tp++){
/* skip bios until we have read plan9.ini */
if(!pxe && tp->type == Tether || tp->type == Tbios)
continue;
if (VERBOSE)
print("probing %s...", typename(tp->type));
if((mp = probe(tp->type, Fini, Dany)) && (mp->flag & Fini)){
print("using %s!%s!%s\n", mp->name, mp->part, mp->ini);
iniread = !dotini(mp->inifs);
break;
}
}
print("\n");
apminit();
debugload = getconf("*debugload") != nil;
if((p = getconf("console")) != nil)
consinit(p, getconf("baud"));
devpccardlink();
devi82365link();
/*
* Even after we find the ini file, we keep probing disks,
* because we have to collect the partition tables and
* have boot devices for parse.
*/
probe(Tany, Fnone, Dany);
if (debugload)
print("end disk probe\n");
tried = 0;
mode = Mauto;
p = getconf("bootfile");
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((mp = parse(p, &file)) == nil) {
print("Unknown boot device: %s\n", p);
goto done;
}
tried = boot(mp, file);
}
done:
if(tried == 0 && mode != Manual){
flag = Fany;
if(mode == Mlocal)
flag &= ~Fbootp;
if((mp = probe(Tany, flag, Dany)) && mp->type->type != Tfloppy)
boot(mp, "");
if (debugload)
print("end auto probe\n");
}
def[0] = 0;
probe(Tany, Fnone, Dany);
if (debugload)
print("end final probe\n");
if(p = getconf("bootdef"))
strcpy(def, p);
flag = 0;
for(tp = types; tp->type != Tnil; tp++){
for(mp = tp->media; mp; mp = mp->next){
if(flag == 0){
flag = 1;
print("Boot devices:");
}
(*tp->printdevs)(mp->dev);
}
}
if(flag)
print("\n");
for(;;){
if(getstr("boot from", line, sizeof(line), def, (mode != Manual)*15) >= 0)
if(mp = parse(line, &file))
boot(mp, file);
def[0] = 0;
}
}
int
getfields(char *lp, char **fields, int n, char sep)
{
int i;
for(i = 0; lp && *lp && i < n; i++){
while(*lp == sep)
*lp++ = 0;
if(*lp == 0)
break;
fields[i] = lp;
while(*lp && *lp != sep){
if(*lp == '\\' && *(lp+1) == '\n')
*lp++ = ' ';
lp++;
}
}
return i;
}
int
cistrcmp(char *a, char *b)
{
int ac, bc;
for(;;){
ac = *a++;
bc = *b++;
if(ac >= 'A' && ac <= 'Z')
ac = 'a' + (ac - 'A');
if(bc >= 'A' && bc <= 'Z')
bc = 'a' + (bc - 'A');
ac -= bc;
if(ac)
return ac;
if(bc == 0)
break;
}
return 0;
}
int
cistrncmp(char *a, char *b, int n)
{
unsigned ac, bc;
while(n > 0){
ac = *a++;
bc = *b++;
n--;
if(ac >= 'A' && ac <= 'Z')
ac = 'a' + (ac - 'A');
if(bc >= 'A' && bc <= 'Z')
bc = 'a' + (bc - 'A');
ac -= bc;
if(ac)
return ac;
if(bc == 0)
break;
}
return 0;
}
#define PSTART ( 8*1024*1024)
#define PEND (16*1024*1024)
ulong palloc = PSTART;
void*
ialloc(ulong n, int align)
{
ulong p;
int a;
p = palloc;
if(align <= 0)
align = 4;
if(a = n % align)
n += align - a;
if(a = p % align)
p += align - a;
palloc = p+n;
if(palloc > PEND)
panic("ialloc(%lud, %d) called from %#p\n",
n, align, getcallerpc(&n));
return memset((void*)(p|KZERO), 0, n);
}
void*
xspanalloc(ulong size, int align, ulong span)
{
ulong a, v;
if((palloc + (size+align+span)) > PEND)
panic("xspanalloc(%lud, %d, 0x%lux) called from %#p\n",
size, align, span, getcallerpc(&size));
a = (ulong)ialloc(size+align+span, 0);
if(span > 2)
v = (a + span) & ~(span-1);
else
v = a;
if(align > 1)
v = (v + align) & ~(align-1);
return (void*)v;
}
static Block *allocbp;
Block*
allocb(int size)
{
Block *bp, **lbp;
ulong addr;
lbp = &allocbp;
for(bp = *lbp; bp; bp = bp->next){
if((bp->lim - bp->base) >= size){
*lbp = bp->next;
break;
}
lbp = &bp->next;
}
if(bp == 0){
if((palloc + (sizeof(Block)+size+64)) > PEND)
panic("allocb(%d) called from %#p\n",
size, getcallerpc(&size));
bp = ialloc(sizeof(Block)+size+64, 0);
addr = (ulong)bp;
addr = ROUNDUP(addr + sizeof(Block), 8);
bp->base = (uchar*)addr;
bp->lim = ((uchar*)bp) + sizeof(Block)+size+64;
}
if(bp->flag)
panic("allocb reuse\n");
bp->rp = bp->base;
bp->wp = bp->rp;
bp->next = 0;
bp->flag = 1;
return bp;
}
void
freeb(Block* bp)
{
bp->next = allocbp;
allocbp = bp;
bp->flag = 0;
}
enum {
Paddr= 0x70, /* address port */
Pdata= 0x71, /* data port */
};
uchar
nvramread(int offset)
{
outb(Paddr, offset);
return inb(Pdata);
}
void (*etherdetach)(void);
void (*floppydetach)(void);
void (*sddetach)(void);
void
warp9(ulong entry)
{
if(etherdetach)
etherdetach();
if(floppydetach)
floppydetach();
if(sddetach)
sddetach();
consdrain();
splhi();
trapdisable();
/*
* This is where to push things on the stack to
* boot *BSD systems, e.g.
(*(void(*)(void*, void*, void*, void*, ulong, ulong))(PADDR(entry)))(0, 0, 0, 0, 8196, 640);
* will enable NetBSD boot (the real memory size needs to
* go in the 5th argument).
*/
(*(void(*)(void))(PADDR(entry)))();
}