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

source/bootloader/u-boot-2020.01/arch/x86/lib/ramtest.c

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * From Coreboot src/lib/ramtest.c
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/post.h>
+
+static void write_phys(unsigned long addr, u32 value)
+{
+#if CONFIG_SSE2
+	asm volatile(
+		"movnti %1, (%0)"
+		: /* outputs */
+		: "r" (addr), "r" (value) /* inputs */
+		: /* clobbers */
+		);
+#else
+	writel(value, addr);
+#endif
+}
+
+static u32 read_phys(unsigned long addr)
+{
+	return readl(addr);
+}
+
+static void phys_memory_barrier(void)
+{
+#if CONFIG_SSE2
+	/* Needed for movnti */
+	asm volatile(
+		"sfence"
+		:
+		:
+		: "memory"
+	);
+#else
+	asm volatile(""
+		:
+		:
+		: "memory");
+#endif
+}
+
+void quick_ram_check(void)
+{
+	int fail = 0;
+	u32 backup;
+
+	backup = read_phys(CONFIG_RAMBASE);
+	write_phys(CONFIG_RAMBASE, 0x55555555);
+	phys_memory_barrier();
+	if (read_phys(CONFIG_RAMBASE) != 0x55555555)
+		fail = 1;
+	write_phys(CONFIG_RAMBASE, 0xaaaaaaaa);
+	phys_memory_barrier();
+	if (read_phys(CONFIG_RAMBASE) != 0xaaaaaaaa)
+		fail = 1;
+	write_phys(CONFIG_RAMBASE, 0x00000000);
+	phys_memory_barrier();
+	if (read_phys(CONFIG_RAMBASE) != 0x00000000)
+		fail = 1;
+	write_phys(CONFIG_RAMBASE, 0xffffffff);
+	phys_memory_barrier();
+	if (read_phys(CONFIG_RAMBASE) != 0xffffffff)
+		fail = 1;
+
+	write_phys(CONFIG_RAMBASE, backup);
+	if (fail) {
+		post_code(POST_RAM_FAILURE);
+		panic("RAM INIT FAILURE!\n");
+	}
+	phys_memory_barrier();
+}