x86: Add msr command
It is useful to obtain the results of MSR queries as well as to update
MSR registers, so add a command these tasks.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd/Makefile b/test/cmd/Makefile
index 302c748..4080835 100644
--- a/test/cmd/Makefile
+++ b/test/cmd/Makefile
@@ -12,7 +12,7 @@
obj-$(CONFIG_CMD_PAUSE) += test_pause.o
endif
obj-y += exit.o mem.o
-obj-$(CONFIG_X86) += cpuid.o
+obj-$(CONFIG_X86) += cpuid.o msr.o
obj-$(CONFIG_CMD_ADDRMAP) += addrmap.o
obj-$(CONFIG_CMD_BDI) += bdinfo.o
obj-$(CONFIG_CMD_FDT) += fdt.o
diff --git a/test/cmd/msr.c b/test/cmd/msr.c
new file mode 100644
index 0000000..e9a152e
--- /dev/null
+++ b/test/cmd/msr.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Tests for msr command
+ *
+ * Copyright 2024 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <test/cmd.h>
+#include <test/ut.h>
+
+static int cmd_test_msr(struct unit_test_state *uts)
+{
+ ut_assertok(run_commandf("msr read 200"));
+ ut_assert_nextline("00000000 ffe00006");
+ ut_assert_console_end();
+
+ /* change the first variable msr and see it reflected in the mtrr cmd */
+ ut_assertok(run_commandf("mtrr"));
+ ut_assert_nextline("CPU 65537:");
+ ut_assert_nextlinen("Reg");
+ ut_assert_nextlinen("0 Y Back 00000000ffe00000");
+ ut_assertok(console_record_reset_enable());
+
+ /* change the type from 6 to 5 */
+ ut_assertok(run_commandf("msr write 200 0 ffe00005"));
+ ut_assert_console_end();
+
+ /* Now it shows 'Protect' */
+ ut_assertok(run_commandf("mtrr"));
+ ut_assert_nextline("CPU 65537:");
+ ut_assert_nextlinen("Reg");
+ ut_assert_nextlinen("0 Y Protect 00000000ffe00000");
+ ut_assertok(console_record_reset_enable());
+
+ return 0;
+}
+CMD_TEST(cmd_test_msr, UTF_CONSOLE);