diff options
Diffstat (limited to 'include/asm-m68k/io.h')
| -rw-r--r-- | include/asm-m68k/io.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-m68k/io.h b/include/asm-m68k/io.h index e14a581dc1..29b3972473 100644 --- a/include/asm-m68k/io.h +++ b/include/asm-m68k/io.h @@ -28,6 +28,20 @@ #include <asm/byteorder.h> +/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates + * two accesses to memory, which may be undesirable for some devices. + */ +#define __raw_readb(addr) \ + ({ u8 __v = (*(volatile u8 *) (addr)); __v; }) +#define __raw_readw(addr) \ + ({ u16 __v = (*(volatile u16 *) (addr)); __v; }) +#define __raw_readl(addr) \ + ({ u32 __v = (*(volatile u32 *) (addr)); __v; }) + +#define __raw_writeb(addr,b) (void)((*(volatile u8 *) (addr)) = (b)) +#define __raw_writew(addr,w) (void)((*(volatile u16 *) (addr)) = (w)) +#define __raw_writel(addr,l) (void)((*(volatile u32 *) (addr)) = (l)) + #define readb(addr) in_8((volatile u8 *)(addr)) #define writeb(b,addr) out_8((volatile u8 *)(addr), (b)) #if !defined(__BIG_ENDIAN) |