coreboot
coreboot is an Open Source project aimed at replacing the proprietary BIOS found in most computers.
rcba.h
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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 #ifndef SOUTHBRIDGE_INTEL_DEFAULT_RCBA_H
4 #define SOUTHBRIDGE_INTEL_DEFAULT_RCBA_H
5 
6 #define DEFAULT_RCBA ((u8 *)CONFIG_FIXED_RCBA_MMIO_BASE)
7 
8 /* Root Complex Register Block */
9 #define RCBA 0xf0
10 #define RCBA_ENABLE 0x01
11 
12 #define RCBA8(x) (*((volatile u8 *)(DEFAULT_RCBA + (x))))
13 #define RCBA16(x) (*((volatile u16 *)(DEFAULT_RCBA + (x))))
14 #define RCBA32(x) (*((volatile u32 *)(DEFAULT_RCBA + (x))))
15 #define RCBA64(x) (*((volatile u64 *)(DEFAULT_RCBA + (x))))
16 
17 #define RCBA_AND_OR(bits, x, and, or) \
18  (RCBA##bits(x) = ((RCBA##bits(x) & (and)) | (or)))
19 #define RCBA8_AND_OR(x, and, or) RCBA_AND_OR(8, x, and, or)
20 #define RCBA16_AND_OR(x, and, or) RCBA_AND_OR(16, x, and, or)
21 #define RCBA32_AND_OR(x, and, or) RCBA_AND_OR(32, x, and, or)
22 #define RCBA32_OR(x, or) RCBA_AND_OR(32, x, ~0UL, or)
23 
24 #endif /* SOUTHBRIDGE_INTEL_DEFAULT_RCBA_H */