tests/acpigen: Patch to allow moving buffers

When a package length needs to be written, we used to always
write three bytes for it, even when the length would fit into
one or two bytes. To allow such compact package lengths, we
have to move the written buffer data in case the length is
smaller. This makes tracking the start of nested buffers
harder, as they may be moved entirely later when a package
length is written. So instead of tracking start addresses in
test_acpigen_nested_ifs(), let's work with the generated AML
alone. In this lucky case, we can simply search for the `if`
operations.

Change-Id: Id8557dd5d1be3878713ee0b6106c3e0975665e97
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79008
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 14 insertions, 10 deletions

diff --git a/tests/acpi/acpigen-test.c b/tests/acpi/acpigen-test.c
index 156b544095..0d261e22d9 100644
--- a/tests/acpi/acpigen-test.c
+++ b/tests/acpi/acpigen-test.c
@@ -76,37 +76,41 @@ static void test_acpigen_single_if(void **state)
 	assert_int_equal(if_package_length, block_length);
 }
 
-static void create_nested_ifs_recursive(char *stack_start[], char *stack_end[], u32 i, u32 n)
+static void create_nested_ifs_recursive(size_t stack_len[], u32 i, u32 n)
 {
 	if (i >= n)
 		return;
 
-	stack_start[i] = acpigen_get_current();
+	char *const start = acpigen_get_current();
 	acpigen_write_if_and(LOCAL0_OP, ZERO_OP);
 
 	for (int k = 0; k < 3; ++k)
 		acpigen_write_store_ops(ZERO_OP, LOCAL1_OP);
 
-	create_nested_ifs_recursive(stack_start, stack_end, i + 1, n);
+	create_nested_ifs_recursive(stack_len, i + 1, n);
 
 	acpigen_pop_len();
-	stack_end[i] = acpigen_get_current();
+	stack_len[i] = acpigen_get_current() - start;
 }
 
 static void test_acpigen_nested_ifs(void **state)
 {
 	char *acpigen_buf = *state;
 	const size_t nesting_level = 8;
-	char *block_start[8] = {0};
-	char *block_end[8] = {0};
+	size_t block_len[8] = {0};
 
 	acpigen_set_current(acpigen_buf);
 
-	create_nested_ifs_recursive(block_start, block_end, 0, nesting_level);
+	create_nested_ifs_recursive(block_len, 0, nesting_level);
 
-	for (int i = 0; i < nesting_level; ++i)
-		assert_int_equal(decode_package_length(block_start[i]),
-				 block_end[i] - block_start[i] - 1);
+	for (int i = 0, j = 0; i < nesting_level; ++i, ++j) {
+		/* Find next if op */
+		for (; j < ACPIGEN_TEST_BUFFER_SZ; ++j) {
+			if ((u8)acpigen_buf[j] == IF_OP)
+				break;
+		}
+		assert_int_equal(decode_package_length(acpigen_buf + j), block_len[i] - 1);
+	}
 }
 
 static void test_acpigen_write_package(void **state)