void
serve(void)
{
u_int req, whom, perm;
for(;;) {
perm = 0;
req = ipc_recv(&whom, REQVA, &perm);
if (debug)
printf("fs req %d from %08x [page %08x: %s]\n",
req, whom, vpt[VPN(REQVA)], REQVA);
// All requests must contain an argument page
if (!(perm & PTE_P)) {
printf("Invalid request from %08x: no argument page\n",
whom);
continue; // just leave it hanging...
}
switch (req) {
case FSREQ_OPEN:
serve_open(whom, (struct Fsreq_open*)REQVA);
break;
case FSREQ_MAP:
serve_map(whom, (struct Fsreq_map*)REQVA);
break;
case FSREQ_SET_SIZE:
serve_set_size(whom, (struct Fsreq_set_size*)REQVA);
break;
case FSREQ_CLOSE:
serve_close(whom, (struct Fsreq_close*)REQVA);
break;
case FSREQ_DIRTY:
serve_dirty(whom, (struct Fsreq_dirty*)REQVA);
break;
case FSREQ_REMOVE:
serve_remove(whom, (struct Fsreq_remove*)REQVA);
break;
case FSREQ_SYNC:
serve_sync(whom);
break;
default:
printf("Invalid request code %d from %08x\n", whom, req);
break;
}
sys_mem_unmap(0, REQVA);
}
}
void
duppage(u_int dstenv, u_int addr)
{
int r;
u_char *tmp;
tmp = (u_char*)(UTEXT-BY2PG); // should be available!
// This is NOT what you should do in your fork.
if ((r=sys_mem_alloc(dstenv, addr, PTE_P|PTE_U|PTE_W)) < 0)
panic("sys_mem_alloc: %e", r);
if ((r=sys_mem_map(dstenv, addr, 0, (u_int)tmp, PTE_P|PTE_U|PTE_W)) < 0)
panic("sys_mem_map: %e", r);
memcpy(tmp, (u_char*)addr, BY2PG);
if ((r=sys_mem_unmap(0, (u_int)tmp)) < 0)
panic("sys_mem_unmap: %e", r);
}
