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[POWERPC] bootwrapper: dt_xlate_range() bugfixes

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1. The check whether ranges fits in the buffer was using elements rather
than bytes.
2. Empty ranges were not properly treated as transparent, and missing
ranges were treated as transparent.
3. The loop terminated when translating from the root rather than to.  Once
bug #2 was fixed, it failed due to a missing ranges in the root node.
4. In decoding the ranges property, the #size-cells used was that of
the parent, not the child.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Scott Wood 2007-08-21 03:39:46 +10:00 committed by Paul Mackerras
parent 643d3c139b
commit 0602801c22
1 changed files with 13 additions and 7 deletions
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20
arch/powerpc/boot/devtree.c
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@ -218,7 +218,7 @@ static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
u32 this_addr[MAX_ADDR_CELLS];
void *parent;
u64 ret_addr, ret_size;
u32 naddr, nsize, prev_naddr;
u32 naddr, nsize, prev_naddr, prev_nsize;
int buflen, offset;
parent = get_parent(node);
@ -233,7 +233,7 @@ static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
offset = (naddr + nsize) * res;
if (reglen < offset + naddr + nsize ||
sizeof(dt_xlate_buf) < offset + naddr + nsize)
sizeof(dt_xlate_buf) < (offset + naddr + nsize) * 4)
return 0;
copy_val(last_addr, dt_xlate_buf + offset, naddr);
@ -244,20 +244,26 @@ static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
ret_size |= dt_xlate_buf[offset + naddr + 1];
}
while ((node = get_parent(node))) {
for (;;) {
prev_naddr = naddr;
prev_nsize = nsize;
node = parent;
get_reg_format(node, &naddr, &nsize);
parent = get_parent(node);
if (!parent)
break;
get_reg_format(parent, &naddr, &nsize);
buflen = getprop(node, "ranges", dt_xlate_buf,
sizeof(dt_xlate_buf));
if (buflen < 0)
if (buflen == 0)
continue;
if (buflen > sizeof(dt_xlate_buf))
if (buflen < 0 || buflen > sizeof(dt_xlate_buf))
return 0;
offset = find_range(last_addr, dt_xlate_buf, prev_naddr,
naddr, nsize, buflen / 4);
naddr, prev_nsize, buflen / 4);
if (offset < 0)
return 0;