arch/all-linux/hidd/pcilinux/syscall.h

   1 /*
   2  * This driver uses direct hardware access, so it runs only on x86 machines.
   3  * Additionally it uses iopl syscall which is available only on Linux.
   4  *
   5  * Since this driver is so machine-specific, we use direct syscalls and inline them
   6  * here. If this driver is ever made portable and machine-independent, this will need to
   7  * be replaced with libc functions called via hostlib.resource (on some UNIXes, for
   8  * example on Darwin, syscalls are private API and no binary compatibility is
   9  * guaranteed accross OS versions).
  10  */
  11
  12 static inline int syscall1(IPTR num, IPTR arg1)
  13 {
  14     int ret;
  15
  16     asm volatile(
  17                 "int $0x80"
  18                 :"=a"(ret)
  19                 :"a"(num), "b"(arg1)
  20     );
  21     return ret;
  22 }
  23
  24 static inline int syscall2(IPTR num, IPTR arg1, IPTR arg2)
  25 {
  26     int ret;
  27
  28     asm volatile(
  29                 "int $0x80"
  30                 :"=a"(ret)
  31                 :"a"(num), "b"(arg1), "c"(arg2)
  32     );
  33     return ret;
  34 }