arch/x86/include/asm/pc-conf-reg.h

   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 */