void exec(b32 *filename)
{
b32 pcb_;
b32 page;
asm volatile(
"jmp . \n\t"
:::
);
procpop(&pcb_);
getpageaddr(PCBAddr,pcb_,0x4c,&page); //需要pcb块大小
initpage(page);
PCB * pcb=(PCB *)pcb_;
printdword((b32)(pcb));
pcb->esp=0x13FFFF0;
pcb->status=READY;
pcb->cr3=page;
pcb->pid=(*(b32 *)PID)+4;
pcb->edi=0;
pcb->esi=0;
pcb->ebx=0;
pcb->edx=0;
pcb->eflags=0;
pcb->ss=user_stack;
pcb->cs=user_code;
pcb->eip=0;
*(b32 *)PID=*(b32 *)PID+4;
b32 phymem;
filename[11]=0; //得到格式化后的文件名
mempop(&phymem);
readfile(filename,phymem);
linkpage(pcb->cr3,0x1000000,phymem);
quenein(READYAddr,READYBottom,READYhead,READYtail,pcb_);
}
void walkpages() /* process the pages in the DVI-file */
{
register bool wantpage;
pagecounter = 0L;
while ((opcode = skipnops()) != POST) {
if (opcode != BOP) /* should be at start of page now */
errorexit(nobop);
else {
pagecounter++;
pagenr = sget4(); /* get TeX page number */
mseek(DVIfile, 36L, relative); /* skip page header */
backpointer = sget4(); /* get previous page offset */
if (pageswitchon)
if (sequenceon)
wantpage = inlist(pagecounter);
else
wantpage = inlist(pagenr);
else
wantpage = TRUE;
if (wantpage) {
initpage();
dopage();
printpage();
}
else {
skippage();
}
}
}
} /* walkpages */
