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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
enum{
Qdir,
Qboot,
Qmem,
};
Dirtab bootdir[]={
".", {Qdir,0,QTDIR}, 0, 0555,
"boot", {Qboot}, 0, 0666,
"mem", {Qmem}, 0, 0666,
};
#define NBOOT (sizeof bootdir/sizeof(Dirtab))
static void
bootreset(void)
{
}
static Chan*
bootattach(char *spec)
{
return devattach('B', spec);
}
static Walkqid*
bootwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, bootdir, NBOOT, devgen);
}
static int
bootstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, bootdir, NBOOT, devgen);
}
static Chan*
bootopen(Chan *c, int omode)
{
return devopen(c, omode, bootdir, NBOOT, devgen);
}
static void
bootclose(Chan*)
{
}
static long
bootread(Chan *c, void *buf, long n, vlong off)
{
ulong offset = off;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, buf, n, bootdir, NBOOT, devgen);
case Qmem:
/* kernel memory */
if(offset>=KZERO && offset<KZERO+conf.npage*BY2PG){
if(offset+n > KZERO+conf.npage*BY2PG)
n = KZERO+conf.npage*BY2PG - offset;
memmove(buf, (char*)offset, n);
return n;
}
error(Ebadarg);
}
error(Egreg);
return 0; /* not reached */
}
static long
bootwrite(Chan *c, void *buf, long n, vlong off)
{
ulong offset = off;
ulong pc;
uchar *p;
switch((ulong)c->qid.path){
case Qmem:
/* kernel memory */
if(offset>=KZERO && offset<KZERO+conf.npage*BY2PG){
if(offset+n > KZERO+conf.npage*BY2PG)
n = KZERO+conf.npage*BY2PG - offset;
memmove((char*)offset, buf, n);
segflush((void*)offset, n);
return n;
}
error(Ebadarg);
case Qboot:
p = (uchar*)buf;
pc = (((((p[0]<<8)|p[1])<<8)|p[2])<<8)|p[3];
if(pc < KZERO || pc >= KZERO+conf.npage*BY2PG)
error(Ebadarg);
splhi();
segflush((void*)pc, 64*1024);
gotopc(pc);
}
error(Ebadarg);
return 0; /* not reached */
}
Dev bootdevtab = {
'B',
"boot",
bootreset,
devinit,
devshutdown,
bootattach,
bootwalk,
bootstat,
bootopen,
devcreate,
bootclose,
bootread,
devbread,
bootwrite,
devbwrite,
devremove,
devwstat,
};
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