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1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (c) 2015 Google, Inc
4  */
5 
6 #ifndef __ASM_ARCH_MICROCODE_H
7 #define __ASM_ARCH_MICROCODE_H
8 
9 #ifndef __ASSEMBLY__
10 
11 /* This is a declaration for ucode_base in start.S */
12 extern u32 ucode_base;
13 extern u32 ucode_size;
14 
15 /**
16  * microcode_update_intel() - Apply microcode updates
17  *
18  * Applies any microcode updates in the device tree.
19  *
20  * @return 0 if OK, -EEXIST if the updates were already applied, -ENOENT if
21  * not updates were found, -EINVAL if an update was invalid
22  */
23 int microcode_update_intel(void);
24 
25 /**
26  * microcode_read_rev() - Read the microcode version
27  *
28  * This reads the microcode version of the currently running CPU
29  *
30  * @return microcode version number
31  */
32 int microcode_read_rev(void);
33 #endif /* __ASSEMBLY__ */
34 
35 #endif
36