From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Date: Sat, 07 Apr 2018 17:03:46 +0300 Subject: [U-Boot] [PATCH v6] x86: Add 64-bit memory-mapped I/O functions In-Reply-To: <20180406214304.GA4871@intel.com> References: <20180406214304.GA4871@intel.com> Message-ID: <1523109826.21176.407.camel@linux.intel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 > Signed-off-by: Ivan Gorinov > --- > 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)) -- Andy Shevchenko Intel Finland Oy