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authorKumar Gala <galak@kernel.crashing.org>2009-02-06 08:08:06 -0600
committerWolfgang Denk <wd@denx.de>2009-02-10 00:47:18 +0100
commitbced7ccefa08512c54a6d146658ff7dbc33d5dfe (patch)
tree0f87a4b5540da1d8f3f9c732960699a11cba0337 /lib_ppc
parent87c9063963561d3d01064be34d0c30855a56587b (diff)
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ppc: Fix roll over bug in flush_cache()
If we call flush_cache(0xfffff000, 0x1000) it would never terminate the loop since end = 0xffffffff and we'd roll over our counter from 0xfffffe0 to 0 (assuming a 32-byte cache line) Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'lib_ppc')
-rw-r--r--lib_ppc/cache.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib_ppc/cache.c b/lib_ppc/cache.c
index 1292b71..338b08b 100644
--- a/lib_ppc/cache.c
+++ b/lib_ppc/cache.c
@@ -33,14 +33,16 @@ void flush_cache(ulong start_addr, ulong size)
start = start_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1);
end = start_addr + size - 1;
- for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) {
+ for (addr = start; (addr <= end) && (addr >= start);
+ addr += CONFIG_SYS_CACHELINE_SIZE) {
asm volatile("dcbst 0,%0" : : "r" (addr) : "memory");
WATCHDOG_RESET();
}
/* wait for all dcbst to complete on bus */
asm volatile("sync" : : : "memory");
- for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) {
+ for (addr = start; (addr <= end) && (addr >= start);
+ addr += CONFIG_SYS_CACHELINE_SIZE) {
asm volatile("icbi 0,%0" : : "r" (addr) : "memory");
WATCHDOG_RESET();
}