gustavonihei commented on a change in pull request #4699:
URL: https://github.com/apache/incubator-nuttx/pull/4699#discussion_r732185107
##########
File path: arch/xtensa/src/common/xtensa_cache.c
##########
@@ -155,6 +155,96 @@ void up_invalidate_icache_all(void)
}
#endif
+/****************************************************************************
+ * Name: up_lock_icache
+ *
+ * Description:
+ * Prefetch and lock the instruction cache within the specified region.
+ *
+ * Input Parameters:
+ * start - virtual start address of region
+ * end - virtual end address of region + 1
+ *
+ * Returned Value:
+ * None
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_XTENSA_ICACHE) && defined(CONFIG_XTENSA_ICACHE_LOCK)
+void up_lock_icache(uintptr_t start, uint32_t end)
+{
+ /* align to XCHAL_ICACHE_SIZE */
+
+ uint32_t addr = start - (start & (XCHAL_ICACHE_LINESIZE - 1));
+
+ for (; addr < end; addr += XCHAL_ICACHE_LINESIZE)
+ {
+ __asm__ __volatile__ ("ipfl %0, 0\n": : "r"(addr));
+ };
+
+ __asm__ __volatile__ ("isync\n");
+}
+#endif
+
+/****************************************************************************
+ * Name: up_unlock_icache
+ *
+ * Description:
+ * Unlock the instruction cache within the specified region.
+ *
+ * Input Parameters:
+ * start - virtual start address of region
+ * end - virtual end address of region + 1
+ *
+ * Returned Value:
+ * None
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_XTENSA_ICACHE) && defined(CONFIG_XTENSA_ICACHE_LOCK)
+void up_unlock_icache(uintptr_t start, uint32_t end)
+{
+ /* align to XCHAL_ICACHE_SIZE */
Review comment:
```suggestion
/* Align to XCHAL_ICACHE_LINESIZE */
```
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