On Fri, 2018-04-06 at 14:43 -0700, Ivan Gorinov wrote:
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.
Thanks!
FWIW, Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com
Signed-off-by: Ivan Gorinov ivan.gorinov@intel.com
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 263dd8f..4ab0080 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))