From b19b250de70cc4ac5b4ecbeac714e7a4aaadf5fb Mon Sep 17 00:00:00 2001 From: Andrew Ryabinin Date: Wed, 31 Oct 2012 11:50:06 +0400 Subject: rk27xx: Disable interrupts before invalidating cache. If interrupts trigger during cache invalidation this could cause memory corruption. This should be right fix for commit_discard_idcache in contrast to 72ebcbf and c1ec1ec. Change-Id: I141fb585004d4a1967b0a03bc37db3964d886564 Reviewed-on: http://gerrit.rockbox.org/345 Tested-by: Andrew Ryabinin Reviewed-by: Marcin Bukat --- firmware/target/arm/rk27xx/system-rk27xx.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/firmware/target/arm/rk27xx/system-rk27xx.c b/firmware/target/arm/rk27xx/system-rk27xx.c index 8e6773f816..d264476328 100644 --- a/firmware/target/arm/rk27xx/system-rk27xx.c +++ b/firmware/target/arm/rk27xx/system-rk27xx.c @@ -97,7 +97,7 @@ void irq_handler(void) "sub sp, sp, #8 \n"); /* Reserve stack */ int irq_no = INTC_ISR & 0x1f; - + irqvector[irq_no](); /* clear interrupt */ @@ -200,14 +200,7 @@ void udelay(unsigned usecs) ); } -/* Invalidating both cache lines from single function - * gives sometimes strange data aborts. - * This version resembles how OF invalidates cache. - * noinline attribute is to guarantee that future - * gcc change will not decide to inline this call (although - * current arm-eabi version from our toolchain doesn't do that - */ -static void __attribute__((noinline)) cache_invalidate_way(int way) +static void cache_invalidate_way(int way) { /* Issue invalidata way command to the cache controler */ CACHEOP = ((way<<31)|0x2); @@ -218,15 +211,13 @@ static void __attribute__((noinline)) cache_invalidate_way(int way) void commit_discard_idcache(void) { - DEVID &= ~(1<<31); /* disable cache */ + int old_irq = disable_irq_save(); - /* invalidate cache way 0 */ cache_invalidate_way(0); - /* invalidate cache way 1 */ cache_invalidate_way(1); - DEVID |= (1<<31); /* enable cache */ + restore_irq(old_irq); } void commit_discard_dcache (void) __attribute__((alias("commit_discard_idcache"))); @@ -235,6 +226,8 @@ void commit_discard_dcache_range (const void *base, unsigned int size) int cnt = size + ((unsigned long)base & 0x1f); unsigned long opcode = ((unsigned long)base & 0xffffffe0) | 0x01; + int old_irq = disable_irq_save(); + while (cnt > 0) { CACHEOP = opcode; @@ -244,6 +237,8 @@ void commit_discard_dcache_range (const void *base, unsigned int size) cnt -= 32; opcode += 32; } + + restore_irq(old_irq); } #ifdef HAVE_ADJUSTABLE_CPU_FREQ -- cgit v1.2.3