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Directory :  /lib/modules/3.13.0-49-generic/build/arch/x86/include/asm/

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Current File : /lib/modules/3.13.0-49-generic/build/arch/x86/include/asm/processor-cyrix.h
/*
 * NSC/Cyrix CPU indexed register access. Must be inlined instead of
 * macros to ensure correct access ordering
 * Access order is always 0x22 (=offset), 0x23 (=value)
 *
 * When using the old macros a line like
 *   setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
 * gets expanded to:
 *  do {
 *    outb((CX86_CCR2), 0x22);
 *    outb((({
 *        outb((CX86_CCR2), 0x22);
 *        inb(0x23);
 *    }) | 0x88), 0x23);
 *  } while (0);
 *
 * which in fact violates the access order (= 0x22, 0x22, 0x23, 0x23).
 */

static inline u8 getCx86(u8 reg)
{
	outb(reg, 0x22);
	return inb(0x23);
}

static inline void setCx86(u8 reg, u8 data)
{
	outb(reg, 0x22);
	outb(data, 0x23);
}

#define getCx86_old(reg) ({ outb((reg), 0x22); inb(0x23); })

#define setCx86_old(reg, data) do { \
	outb((reg), 0x22); \
	outb((data), 0x23); \
} while (0)

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