This macro returns 1 if the argument (address) is aligned, returns zero otherwise. This will be used to test user-supplied address to various commands to prevent user from loading data to/from unaligned address when using caches.
This is made as a macro, because macros are expanded where they are used. Therefore it can be easily instrumented to report position of the fault.
Signed-off-by: Marek Vasut marex@denx.de Cc: Wolfgang Denk wd@denx.de --- include/common.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/include/common.h b/include/common.h index 322569e..17c64b0 100644 --- a/include/common.h +++ b/include/common.h @@ -730,6 +730,24 @@ void invalidate_dcache_range(unsigned long start, unsigned long stop); void invalidate_dcache_all(void); void invalidate_icache_all(void);
+/* Test if address is cache-aligned. Returns 0 if it is, 1 otherwise. */ +#define cacheline_aligned(addr) \ + ({ \ + int __ret; \ + if (!dcache_status()) { \ + __ret = 1; \ + } else if ((addr) & (ARCH_DMA_MINALIGN - 1)) { \ + puts("Align load address to " \ + __stringify(ARCH_DMA_MINALIGN) \ + " bytes when using caches!\n"); \ + __ret = 0; \ + } else { \ + __ret = 1; \ + } \ + __ret; \ + }) + + /* arch/$(ARCH)/lib/ticks.S */ unsigned long long get_ticks(void); void wait_ticks (unsigned long);