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[Xen-devel,v5,01/22] arm/acpi: Emulate io ports for arm

Message ID 1456467780-8476-2-git-send-email-zhaoshenglong@huawei.com
State New
Headers show

Commit Message

Shannon Zhao Feb. 26, 2016, 6:22 a.m. UTC 
From: Shannon Zhao <shannon.zhao@linaro.org>

Add macros to emulate x86 style ports for arm. This avoids modification in
common code for acpi. Here just print a warning on ARM.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
V5: not write to the address, just print warning
V4: print warning
---
 xen/include/asm-arm/arm64/io.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
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Patch

diff --git a/xen/include/asm-arm/arm64/io.h b/xen/include/asm-arm/arm64/io.h
index 37abc47..f80156f 100644
--- a/xen/include/asm-arm/arm64/io.h
+++ b/xen/include/asm-arm/arm64/io.h
@@ -20,6 +20,7 @@ 
 #ifndef _ARM_ARM64_IO_H
 #define _ARM_ARM64_IO_H
 
+#include <asm/system.h>
 #include <asm/byteorder.h>
 
 /*
@@ -109,4 +110,26 @@  static inline u64 __raw_readq(const volatile void __iomem *addr)
 #define writel(v,c)             ({ __iowmb(); writel_relaxed((v),(c)); })
 #define writeq(v,c)             ({ __iowmb(); writeq_relaxed((v),(c)); })
 
+/*
+ * Emulate x86 io ports for ARM.
+ */
+static inline int emulate_read(u64 addr)
+{
+    printk(XENLOG_G_WARNING "Can't access IO %lx\n", addr);
+    return 0;
+}
+
+static inline void emulate_write(u64 addr)
+{
+    printk(XENLOG_G_WARNING "Can't access IO %lx\n", addr);
+}
+
+#define inb(c) ( emulate_read(c) )
+#define inw(c) ( emulate_read(c) )
+#define inl(c) ( emulate_read(c) )
+
+#define outb(v, c) ( emulate_write(c) )
+#define outw(v, c) ( emulate_write(c) )
+#define outl(v, c) ( emulate_write(c) )
+
 #endif /* _ARM_ARM64_IO_H */