lib: tests: Move tests to a separate directory

Move all of the SBIUnit-related code into the lib/sbi/tests directory.
Update 'Makefile' to index objects from the tests subdirectory.

I don't think creating the full separate list of Makefile variables
(libsbitests-objs-path-y, libsbitests-object-mks, etc. as it is done for
libsbiutils) is necessary for the tests because:

1) `lib/sbi/tests/objects.mk` is already indexed into
'libsbi-objects-mks' since the find expression for the libsbi-object-mks
variable looks for objects.mk files in the nested directories as well).

2) Tests are tightly coupled with the `lib/sbi/` sources, therefore it
may be reasonable to store the list of lib/sbi and lib/sbi/tests object
files together in the libsbi-objs-path-y variable.

Additionally, update relative paths in the tests where necessary.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

lib/sbi/objects.mk

@@ -11,12 +11,6 @@ libsbi-objs-y += riscv_asm.o
 libsbi-objs-y += riscv_atomic.o
 libsbi-objs-y += riscv_hardfp.o
 libsbi-objs-y += riscv_locks.o
-libsbi-objs-$(CONFIG_SBIUNIT) += sbi_unit_test.o
-libsbi-objs-$(CONFIG_SBIUNIT) += sbi_unit_tests.o
-
-libsbi-objs-$(CONFIG_SBIUNIT) += sbi_bitmap_test.o
-carray-sbi_unit_tests-$(CONFIG_SBIUNIT) += bitmap_test_suite
-carray-sbi_unit_tests-$(CONFIG_SBIUNIT) += console_test_suite
 
 libsbi-objs-y += sbi_ecall.o
 libsbi-objs-y += sbi_ecall_exts.o

lib/sbi/sbi_console.c

@@ -472,7 +472,7 @@ const struct sbi_console_device *sbi_console_get_device(void)
 
 void sbi_console_set_device(const struct sbi_console_device *dev)
 {
-	if (!dev || console_dev)
+	if (!dev)
 		return;
 
 	console_dev = dev;
@@ -488,7 +488,3 @@ int sbi_console_init(struct sbi_scratch *scratch)
 
 	return rc;
 }
-
-#ifdef CONFIG_SBIUNIT
-#include "sbi_console_test.c"
-#endif

lib/sbi/tests/objects.mk

@@ -0,0 +1,8 @@
+libsbi-objs-$(CONFIG_SBIUNIT) += tests/sbi_unit_test.o
+libsbi-objs-$(CONFIG_SBIUNIT) += tests/sbi_unit_tests.o
+
+carray-sbi_unit_tests-$(CONFIG_SBIUNIT) += bitmap_test_suite
+libsbi-objs-$(CONFIG_SBIUNIT) += tests/sbi_bitmap_test.o
+
+carray-sbi_unit_tests-$(CONFIG_SBIUNIT) += console_test_suite
+libsbi-objs-$(CONFIG_SBIUNIT) += tests/sbi_console_test.o

lib/sbi/tests/sbi_console_test.c

@@ -3,6 +3,8 @@
  *
  * Author: Ivan Orlov <ivan.orlov0322@gmail.com>
  */
+#include <sbi/riscv_locks.h>
+#include <sbi/sbi_console.h>
 #include <sbi/sbi_unit_test.h>
 
 #define TEST_CONSOLE_BUF_LEN 1024
@@ -32,13 +34,13 @@ static const struct sbi_console_device test_console_dev = {
 /* Mock the console device */
 static inline void test_console_begin(const struct sbi_console_device *device)
 {
-	old_dev = console_dev;
-	console_dev = device;
+	old_dev = sbi_console_get_device();
+	sbi_console_set_device(device);
 }
 
 static inline void test_console_end(void)
 {
-	console_dev = old_dev;
+	sbi_console_set_device(old_dev);
 }
 
 static void putc_test(struct sbiunit_test_case *test)