On 2014-07-09 16:40, Gedare Bloom wrote:
On Wed, Jul 9, 2014 at 3:02 AM, Daniel Cederman <ceder...@gaisler.com> wrote:The flush instruction on LEON flushes both the data and the instruction cache. Flushing of just the instruction cache can be done by setting the "flush instruction cache" bit in the cache control register. --- c/src/lib/libbsp/sparc/leon3/include/cache_.h | 5 ++++- c/src/lib/libbsp/sparc/leon3/include/leon.h | 1 + 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/c/src/lib/libbsp/sparc/leon3/include/cache_.h b/c/src/lib/libbsp/sparc/leon3/include/cache_.h index 63790c1..ced5b6d 100644 --- a/c/src/lib/libbsp/sparc/leon3/include/cache_.h +++ b/c/src/lib/libbsp/sparc/leon3/include/cache_.h @@ -136,7 +136,10 @@ static inline void _CPU_cache_unfreeze_data(void) static inline void _CPU_cache_invalidate_entire_instruction(void) { - __asm__ volatile ("flush"); + uint32_t cache_reg = leon3_get_cache_control_register(); + + cache_reg |= LEON3_REG_CACHE_CTRL_FI; + leon3_set_cache_control_register(cache_reg); }Now you should also flush the d-cache explicitly for the case of updating the trap table, as I mentioned in my previous email the store to tbr[] can get cached in d-cache, so if we don't flush d-cache to memory and it is write-back cache, there could be a problem. (I don't know whether sparc32 cache are write-back or write-thru.) -Gedare
The cache is write-thru so there should not be any need to flush the d-cache.
static inline void _CPU_cache_invalidate_instruction_range( diff --git a/c/src/lib/libbsp/sparc/leon3/include/leon.h b/c/src/lib/libbsp/sparc/leon3/include/leon.h index a62ad29..bc3cdde 100644 --- a/c/src/lib/libbsp/sparc/leon3/include/leon.h +++ b/c/src/lib/libbsp/sparc/leon3/include/leon.h @@ -90,6 +90,7 @@ extern "C" { * The following defines the bits in the LEON Cache Control Register. */ #define LEON3_REG_CACHE_CTRL_DS 0x00800000 /* Data cache snooping */ +#define LEON3_REG_CACHE_CTRL_FI 0x00200000 /* Flush instruction cache */ /* LEON3 Interrupt Controller */ extern volatile struct irqmp_regs *LEON3_IrqCtrl_Regs; -- 1.7.9.5 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
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