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[RFC,1/4] arm64: io: Introduce IO_SPACE_BASE

Message ID 1610729929-188490-2-git-send-email-john.garry@huawei.com
State New
Headers show
Series Fix arm64 crash for accessing unmapped IO port regions (reboot) | expand

Commit Message

John Garry Jan. 15, 2021, 4:58 p.m. UTC
Introduce IO_SPACE_BASE, which is the base address of the IO port region.

0x10000 is chosen intentionally to exclude legacy ISA IO port address

Signed-off-by: John Garry <john.garry@huawei.com>
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index fd172c41df90..2bcf55704bee 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -148,6 +148,7 @@  static inline u64 __raw_readq(const volatile void __iomem *addr)
 #define arch_has_dev_port()	(1)
 #define IO_SPACE_LIMIT		(PCI_IO_SIZE - 1)
 #define PCI_IOBASE		((void __iomem *)PCI_IO_START)
+#define IO_SPACE_BASE		(0x10000)
  * String version of I/O memory access operations.