[PATCH v2 3/3] lib: sbi: fix is_region_valid

[Xiang W]

When order is equal to __riscv_xlen, the shift operation will not
perform any operation, which will cause
reg->base & (BIT(reg->order) - 1) to always be 0, and the condition
has not been established. This patch fixes this bug

Signed-off-by: Xiang W <wxjstz at 126.com>
---
 lib/sbi/sbi_domain.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/sbi/sbi_domain.c b/lib/sbi/sbi_domain.c
index 3365e74..65fae89 100644
--- a/lib/sbi/sbi_domain.c
+++ b/lib/sbi/sbi_domain.c
@@ -142,6 +142,9 @@ static bool is_region_valid(const struct sbi_domain_memregion *reg)
 	if (reg->order < 3 || __riscv_xlen < reg->order)
 		return FALSE;
 
+	if (reg->order == __riscv_xlen && reg->base != 0)
+		return FALSE;
+
 	if (reg->base & (BIT(reg->order) - 1))
 		return FALSE;
 
-- 
2.30.2