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The inclusion of sysreg.h allows the use of built-in functions that generate efficient inline instructions to implement read and write of values from and to I/O space addresses.
The prototypes for these functions are, as defined in sysreg.h:
void io_space_write(const unsigned int addr, const int value); int io_space_read(const unsigned int addr);
Либо на асме - ar = io(FLAGS);
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