[PATCH v3 09/52] xen/arm: use PA == VA for EARLY_UART_VIRTUAL_ADDRESS on MPU systems

[Penny Zheng <Penny.Zheng@xxxxxxx>]

From: Wei Chen <wei.chen@xxxxxxx>

There is no VMSA support on MPU systems, so we can not map early
UART to FIXMAP_CONSOLE. In stead, we can use PA == VA for early
UART on MPU systems.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
---
v2:
1. New patch
---
v3:
1. fix comment
2. change CONFIG_ARM_V8R to !CONFIG_HAS_MMU
---
 xen/arch/arm/include/asm/early_printk.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/arm/include/asm/early_printk.h 
b/xen/arch/arm/include/asm/early_printk.h
index c5149b2976..ec5bcc343c 100644
--- a/xen/arch/arm/include/asm/early_printk.h
+++ b/xen/arch/arm/include/asm/early_printk.h
@@ -15,10 +15,22 @@
 
 #ifdef CONFIG_EARLY_PRINTK
 
+#ifndef CONFIG_HAS_MMU
+
+/*
+ * For MPU systems, there is no VMSA support in EL2, so we use VA == PA
+ * for EARLY_UART_VIRTUAL_ADDRESS.
+ */
+#define EARLY_UART_VIRTUAL_ADDRESS CONFIG_EARLY_UART_BASE_ADDRESS
+
+#else
+
 /* need to add the uart address offset in page to the fixmap address */
 #define EARLY_UART_VIRTUAL_ADDRESS \
     (FIXMAP_ADDR(FIXMAP_CONSOLE) + (CONFIG_EARLY_UART_BASE_ADDRESS & 
~PAGE_MASK))
 
+#endif /* CONFIG_HAS_MMU */
+
 #endif /* !CONFIG_EARLY_PRINTK */
 
 #endif
-- 
2.25.1