diff options
Diffstat (limited to 'tools/arch/x86/include/asm/io.h')
| -rw-r--r-- | tools/arch/x86/include/asm/io.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/io.h b/tools/arch/x86/include/asm/io.h index 4c787a2363de..ecad61a3ea52 100644 --- a/tools/arch/x86/include/asm/io.h +++ b/tools/arch/x86/include/asm/io.h @@ -4,6 +4,7 @@ #include <linux/compiler.h> #include <linux/types.h> +#include "special_insns.h" #define build_mmio_read(name, size, type, reg, barrier) \ static inline type name(const volatile void __iomem *addr) \ @@ -72,4 +73,29 @@ build_mmio_write(__writeq, "q", u64, "r", ) #include <asm-generic/io.h> +/** + * iosubmit_cmds512 - copy data to single MMIO location, in 512-bit units + * @dst: destination, in MMIO space (must be 512-bit aligned) + * @src: source + * @count: number of 512 bits quantities to submit + * + * Submit data from kernel space to MMIO space, in units of 512 bits at a + * time. Order of access is not guaranteed, nor is a memory barrier + * performed afterwards. + * + * Warning: Do not use this helper unless your driver has checked that the CPU + * instruction is supported on the platform. + */ +static inline void iosubmit_cmds512(void __iomem *dst, const void *src, + size_t count) +{ + const u8 *from = src; + const u8 *end = from + count * 64; + + while (from < end) { + movdir64b(dst, from); + from += 64; + } +} + #endif /* _TOOLS_ASM_X86_IO_H */ |