arch/x86/include/asm/ioapic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * From coreboot file of the same name
   4  *
   5  * Copyright (C) 2010 coresystems GmbH
   6  */
   7
   8 #ifndef __ASM_IOAPIC_H
   9 #define __ASM_IOAPIC_H
  10
  11 #define IO_APIC_ADDR            0xfec00000
  12
  13 /* Direct addressed register */
  14 #define IO_APIC_INDEX           (IO_APIC_ADDR + 0x00)
  15 #define IO_APIC_DATA            (IO_APIC_ADDR + 0x10)
  16
  17 /* Indirect addressed register offset */
  18 #define IO_APIC_ID              0x00
  19 #define IO_APIC_VER             0x01
  20
  21 /**
  22  * io_apic_read() - Read I/O APIC register
  23  *
  24  * This routine reads I/O APIC indirect addressed register.
  25  *
  26  * @reg:        address of indirect addressed register
  27  * @return:     register value to read
  28  */
  29 u32 io_apic_read(u32 reg);
  30
  31 /**
  32  * io_apic_write() - Write I/O APIC register
  33  *
  34  * This routine writes I/O APIC indirect addressed register.
  35  *
  36  * @reg:        address of indirect addressed register
  37  * @val:        register value to write
  38  */
  39 void io_apic_write(u32 reg, u32 val);
  40
  41 void io_apic_set_id(int ioapic_id);
  42
  43 #endif