From 53cabe3d8eaac128788db9bce3f9d4874068806d Mon Sep 17 00:00:00 2001 From: Ivan Gorinov Date: Fri, 6 Apr 2018 14:43:04 -0700 Subject: [PATCH] x86: Add 64-bit memory-mapped I/O functions Add readq() and writeq() definitions for x86. Please note: in 32-bit code readq/writeq will generate two 32-bit memory access instructions instead of one atomic 64-bit operation. Signed-off-by: Ivan Gorinov Reviewed-by: Andy Shevchenko Reviewed-by: Bin Meng --- arch/x86/include/asm/io.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 263dd8fd17..4ab008074a 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -61,16 +61,20 @@ #define readb(addr) (*(volatile unsigned char *) (addr)) #define readw(addr) (*(volatile unsigned short *) (addr)) #define readl(addr) (*(volatile unsigned int *) (addr)) +#define readq(addr) (*(volatile unsigned long long *) (addr)) #define __raw_readb readb #define __raw_readw readw #define __raw_readl readl +#define __raw_readq readq #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b)) #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b)) #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b)) +#define writeq(b,addr) (*(volatile unsigned long long *) (addr) = (b)) #define __raw_writeb writeb #define __raw_writew writew #define __raw_writel writel +#define __raw_writeq writeq #define memset_io(a,b,c) memset((a),(b),(c)) #define memcpy_fromio(a,b,c) memcpy((a),(b),(c)) -- 2.39.5