GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/cpu/arm926ejs/cache.c

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2011
+ * Ilya Yanok, EmCraft Systems
+ */
+#include <cpu_func.h>
+#include <linux/types.h>
+#include <common.h>
+
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+void invalidate_dcache_all(void)
+{
+	asm volatile("mcr p15, 0, %0, c7, c6, 0\n" : : "r"(0));
+}
+
+void flush_dcache_all(void)
+{
+	asm volatile(
+		"0:"
+		"mrc p15, 0, r15, c7, c14, 3\n"
+		"bne 0b\n"
+		"mcr p15, 0, %0, c7, c10, 4\n"
+		 : : "r"(0) : "memory"
+	);
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	if (!check_cache_range(start, stop))
+		return;
+
+	while (start < stop) {
+		asm volatile("mcr p15, 0, %0, c7, c6, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	if (!check_cache_range(start, stop))
+		return;
+
+	while (start < stop) {
+		asm volatile("mcr p15, 0, %0, c7, c14, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
+
+	asm volatile("mcr p15, 0, %0, c7, c10, 4\n" : : "r"(0));
+}
+#else /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+#endif /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
+
+/*
+ * Stub implementations for l2 cache operations
+ */
+
+__weak void l2_cache_disable(void) {}
+
+#if CONFIG_IS_ENABLED(SYS_THUMB_BUILD)
+__weak void invalidate_l2_cache(void) {}
+#endif
+
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+/* Invalidate entire I-cache and branch predictor array */
+void invalidate_icache_all(void)
+{
+	unsigned long i = 0;
+
+	asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
+}
+#else
+void invalidate_icache_all(void) {}
+#endif
+
+void enable_caches(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+	icache_enable();
+#endif
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+	dcache_enable();
+#endif
+}
+