coreboot
coreboot is an Open Source project aimed at replacing the proprietary BIOS found in most computers.
p2sb.h
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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 #include <commonlib/helpers.h>
4 
5 /*
6  * Currently all known xeon-sp CPUs use C620 PCH. These definitions
7  * come from C620 datasheet (Intel Doc #336067-007US)
8  */
9 
10 #define HPTC_OFFSET 0x60
11 #define HPTC_ADDR_ENABLE_BIT (1 << 7)
12 #define PCH_P2SB_EPMASK0 0xb0
13 #define P2SB_SIZE (16 * MiB)
14 
15 #define P2SBC 0xe0
16 #define SBILOCK (1 << 31)