coreboot
coreboot is an Open Source project aimed at replacing the proprietary BIOS found in most computers.
chip.h
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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 /* Magic value used to locate this chip in the device tree */
4 #define SPEEDSTEP_APIC_MAGIC 0xACAC
5 
7  int acpi_c1; /* ACPI C1 */
8  int acpi_c2; /* ACPI C2 */
9  int acpi_c3; /* ACPI C3 */
10 
11  int tcc_offset; /* TCC Activation Offset */
12 };