1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Support for the configuration register space at port I/O locations 4 * 0x22 and 0x23 variously used by PC architectures, e.g. the MP Spec, 5 * Cyrix CPUs, numerous chipsets. 6 */ 7 #ifndef _ASM_X86_PC_CONF_REG_H 8 #define _ASM_X86_PC_CONF_REG_H 9 10 #include <linux/io.h> 11 #include <linux/spinlock.h> 12 #include <linux/types.h> 13 14 #define PC_CONF_INDEX 0x22 15 #define PC_CONF_DATA 0x23 16 17 #define PC_CONF_MPS_IMCR 0x70 18 19 extern raw_spinlock_t pc_conf_lock; 20 21 static inline u8 pc_conf_get(u8 reg) 22 { 23 outb(reg, PC_CONF_INDEX); 24 return inb(PC_CONF_DATA); 25 } 26 27 static inline void pc_conf_set(u8 reg, u8 data) 28 { 29 outb(reg, PC_CONF_INDEX); 30 outb(data, PC_CONF_DATA); 31 } 32 33 #endif /* _ASM_X86_PC_CONF_REG_H */ 34