[PATCH 2/5] tests: fw_cfg: Support read/write of fw_cfg registers on aarch64

[Xiang Zheng]

Refer to the fw_cfg registers locations of x86 and arm in
docs/specs/fw_cfg.txt, the test codes need to differ on the addresses
for read/write.

Besides, fix the endian problems in mm_fw_cfg_select().

Signed-off-by: Xiang Zheng <address@hidden>
---
 tests/libqos/fw_cfg.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/tests/libqos/fw_cfg.c b/tests/libqos/fw_cfg.c
index 1f46258f96..c1518c5e81 100644
--- a/tests/libqos/fw_cfg.c
+++ b/tests/libqos/fw_cfg.c
@@ -57,7 +57,14 @@ uint64_t qfw_cfg_get_u64(QFWCFG *fw_cfg, uint16_t key)
 
 static void mm_fw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
 {
-    qtest_writew(fw_cfg->qts, fw_cfg->base, key);
+    const char *arch = qtest_get_arch();
+    uint64_t offset = 0;
+
+    if (!strcmp(arch, "aarch64")) {
+        offset = 8;
+    }
+
+    qtest_writew(fw_cfg->qts, fw_cfg->base + offset, cpu_to_be16(key));
 }
 
 /*
@@ -108,9 +115,15 @@ static void mm_fw_cfg_read(QFWCFG *fw_cfg, void *data, 
size_t len)
 {
     uint8_t *ptr = data;
     int i;
+    uint64_t offset = 2;
+    const char *arch = qtest_get_arch();
+
+    if (!strcmp(arch, "aarch64")) {
+        offset = 0;
+    }
 
     for (i = 0; i < len; i++) {
-        ptr[i] = qtest_readb(fw_cfg->qts, fw_cfg->base + 2);
+        ptr[i] = qtest_readb(fw_cfg->qts, fw_cfg->base + offset);
     }
 }
 
-- 
2.19.1