greg/xv6
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Don't map IO space in the user part of the address space

Browse source 
Passes all tests now (but need to update usertests to allow for more than 640k)
This commit is contained in:
Frans Kaashoek 2011-07-31 21:27:02 -04:00
parent 9aa0337dc1
commit 547c28fc1e
2 changed files with 11 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
kalloc.c
View file

@ -56,7 +56,7 @@ kfree(char *v)
{
struct run *r;
if((uint)v % PGSIZE || v < end || v2p(v) >= PHYSTOP)
if((uint)v % PGSIZE || v < end || v2p(v) >= PHYSTOP)
panic("kfree");
// Fill with junk to catch dangling refs.
@ -82,7 +82,6 @@ kalloc(void)
if(r)
kmem.freelist = r->next;
release(&kmem.lock);
cprintf("kalloc: 0x%x\n", r);
return (char*)r;
}

18
vm.c
View file

@ -175,7 +175,6 @@ static struct kmap {
uint e;
int perm;
} kmap[] = {
{ (void *)IOSPACEB, IOSPACEB, IOSPACEE, PTE_W}, // I/O space
{ P2V(IOSPACEB), IOSPACEB, IOSPACEE, PTE_W}, // I/O space
{ (void *)KERNLINK, V2P(KERNLINK), V2P(data), 0}, // kernel text, rodata
{ data, V2P(data), PHYSTOP, PTE_W}, // kernel data, memory
@ -288,7 +287,7 @@ loaduvm(pde_t *pgdir, char *addr, struct inode *ip, uint offset, uint sz)
n = sz - i;
else
n = PGSIZE;
if(readi(ip, (char*)pa, offset+i, n) != n)
if(readi(ip, p2v(pa), offset+i, n) != n)
return -1;
}
return 0;
@ -341,7 +340,8 @@ deallocuvm(pde_t *pgdir, uint oldsz, uint newsz)
pa = PTE_ADDR(*pte);
if(pa == 0)
panic("kfree");
kfree((char*)pa);
char *v = p2v(pa);
kfree(v);
*pte = 0;
}
}
@ -359,8 +359,10 @@ freevm(pde_t *pgdir)
panic("freevm: no pgdir");
deallocuvm(pgdir, USERTOP, 0);
for(i = 0; i < NPDENTRIES; i++){
if(pgdir[i] & PTE_P)
kfree(p2v(PTE_ADDR(pgdir[i])));
if(pgdir[i] & PTE_P) {
char * v = p2v(PTE_ADDR(pgdir[i]));
kfree(v);
}
}
kfree((char*)pgdir);
}
@ -385,7 +387,7 @@ copyuvm(pde_t *pgdir, uint sz)
pa = PTE_ADDR(*pte);
if((mem = kalloc()) == 0)
goto bad;
memmove(mem, (char*)pa, PGSIZE);
memmove(mem, (char*)p2v(pa), PGSIZE);
if(mappages(d, (void*)i, PGSIZE, v2p(mem), PTE_W|PTE_U) < 0)
goto bad;
}
@ -397,7 +399,7 @@ bad:
}
//PAGEBREAK!
// Map user virtual address to kernel physical address.
// Map user virtual address to kernel address.
char*
uva2ka(pde_t *pgdir, char *uva)
{
@ -408,7 +410,7 @@ uva2ka(pde_t *pgdir, char *uva)
return 0;
if((*pte & PTE_U) == 0)
return 0;
return (char*)PTE_ADDR(*pte);
return (char*)p2v(PTE_ADDR(*pte));
}
// Copy len bytes from p to user address va in page table pgdir.