coreboot
coreboot is an Open Source project aimed at replacing the proprietary BIOS found in most computers.
82870.h
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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 /* for io APIC 1461 */
4 #define MBAR 0x10
5 #define ABAR 0x40
6 
7 /* for pci bridge 1460 */
8 #define MTT 0x042
9 #define HCCR 0x0f0
10 #define ACNF 0x0e0
11 #define STRP 0x44 // Strap status register
12 
13 #define STRP_EN133 0x0001 // 133 MHz-capable (Px_133EN)
14 #define STRP_HPCAP 0x0002 // Hot-plug capable (Hx_SLOT zero/nonzero)
15 
16 #define ACNF_SYNCPH 0x0010 // PCI(-X) input clock is synchronous to hub input clock