ref: 76f5318cbd58fbe2bfc8cb51856bfa217c673bb7
dir: /os/boot/pc/bcom.c/
/*
* ld - DOS boot loader of Plan 9
*/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "fs.h"
Type types[] = {
{ Tfloppy,
Fini|Ffs,
floppyinit, floppyinitdev,
floppygetfspart, 0, floppyboot,
},
{ Tsd,
Fini|Ffs,
sdinit, sdinitdev,
sdgetfspart, sdaddconf, sdboot,
},
{ Tnil,
0,
0, 0,
0, 0, 0,
},
};
#include "sd.h"
extern SDifc sdataifc;
extern SDifc sdmylexifc;
extern SDifc sd53c8xxifc;
SDifc* sdifc[] = {
&sdataifc,
// &sdmylexifc,
// &sd53c8xxifc,
nil,
};
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;
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 *defaultpartition = "new";
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;
return nil;
}
static int
boot(Medium *mp, char *file)
{
static Boot b;
memset(&b, 0, sizeof b);
b.state = INIT9LOAD;
// sprint(BOOTLINE, "%s!%s", 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;
}
char *parts[] = { "dos", "9fat", "fs", 0 };
Medium*
probe(int type, int flag, int dev)
{
Type *tp;
int i;
Medium *mp;
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((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((flag & mp->flag) && (dev == Dany || dev == i))
return mp;
}
}
return 0;
}
extern int loopconst;
void
main(void)
{
Medium *mp;
int flag;
char def[2*NAMELEN], line[80], *p, *file;
Type *tp;
i8042a20();
memset(m, 0, sizeof(Mach));
trapinit();
clockinit();
alarminit();
spllo();
kbdinit();
if((ulong)&end > (KZERO|(640*1024)))
panic("i'm too big");
/*
* If there were any arguments, MS-DOS leaves a character
* count followed by the arguments in the runtime header.
* Step over the leading space.
*/
p = (char*)0x80080080;
if(p[0]){
p[p[0]+1] = 0;
p += 2;
}
else
p = 0;
/*
* Advance command line to first option, if any
*/
if(p) {
while(*p==' ' || *p=='\t')
p++;
if(*p == 0)
p = nil;
}
/*
* Probe everything, to collect device names.
*/
probe(Tany, Fnone, Dany);
if(p != 0) {
if((mp = parse(p, &file)) == nil) {
print("bad loadfile syntax: %s\n", p);
goto done;
}
boot(mp, file);
}
done:
flag = 0;
for(tp = types; tp->type != Tnil; tp++){
for(mp = tp->media; mp; mp = mp->next){
if(flag == 0){
flag = 1;
print("Load devices:");
}
print(" %s", mp->name);
}
}
if(flag)
print("\n");
for(;;){
if(getstr("load from", line, sizeof(line), nil, 0) >= 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;
}
void*
ialloc(ulong n, int align)
{
static ulong palloc;
ulong p;
int a;
if(palloc == 0)
palloc = 3*1024*1024;
p = palloc;
if(align <= 0)
align = 4;
if(a = n % align)
n += align - a;
if(a = p % align)
p += align - a;
palloc = p+n;
return memset((void*)(p|KZERO), 0, n);
}
void*
xspanalloc(ulong size, int align, ulong span)
{
ulong a, v;
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){
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();
consdrain();
(*(void(*)(void))(PADDR(entry)))();
}
char*
getconf(char*)
{
return nil;
}
void
addconf(char*, ...)
{
}
void
uartspecial(int, void(*)(int), int(*)(void), int)
{
}
void
uartputs(IOQ*, char*, int)
{
}
void
uartputc(int)
{}
void
uartdrain(void)
{
}