1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * NSC/Cyrix CPU indexed register access. Must be inlined instead of
 4 * macros to ensure correct access ordering
 5 * Access order is always 0x22 (=offset), 0x23 (=value)
 
 
 
 
 
 
 
 
 
 
 
 
 
 6 */
 7
 8#include <asm/pc-conf-reg.h>
 9
10static inline u8 getCx86(u8 reg)
11{
12	return pc_conf_get(reg);
 
13}
14
15static inline void setCx86(u8 reg, u8 data)
16{
17	pc_conf_set(reg, data);
 
18}

 
 1/*
 2 * NSC/Cyrix CPU indexed register access. Must be inlined instead of
 3 * macros to ensure correct access ordering
 4 * Access order is always 0x22 (=offset), 0x23 (=value)
 5 *
 6 * When using the old macros a line like
 7 *   setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
 8 * gets expanded to:
 9 *  do {
10 *    outb((CX86_CCR2), 0x22);
11 *    outb((({
12 *        outb((CX86_CCR2), 0x22);
13 *        inb(0x23);
14 *    }) | 0x88), 0x23);
15 *  } while (0);
16 *
17 * which in fact violates the access order (= 0x22, 0x22, 0x23, 0x23).
18 */
19
 
 
20static inline u8 getCx86(u8 reg)
21{
22	outb(reg, 0x22);
23	return inb(0x23);
24}
25
26static inline void setCx86(u8 reg, u8 data)
27{
28	outb(reg, 0x22);
29	outb(data, 0x23);
30}
31
32#define getCx86_old(reg) ({ outb((reg), 0x22); inb(0x23); })
33
34#define setCx86_old(reg, data) do { \
35	outb((reg), 0x22); \
36	outb((data), 0x23); \
37} while (0)
38