1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * AMD SEV header for early boot related functions.
4 *
5 * Author: Tom Lendacky <thomas.lendacky@amd.com>
6 */
7
8#ifndef BOOT_COMPRESSED_SEV_H
9#define BOOT_COMPRESSED_SEV_H
10
11#ifdef CONFIG_AMD_MEM_ENCRYPT
12
13#include "../msr.h"
14
15void snp_accept_memory(phys_addr_t start, phys_addr_t end);
16u64 sev_get_status(void);
17bool early_is_sevsnp_guest(void);
18
19static inline u64 sev_es_rd_ghcb_msr(void)
20{
21 struct msr m;
22
23 boot_rdmsr(MSR_AMD64_SEV_ES_GHCB, m: &m);
24
25 return m.q;
26}
27
28static inline void sev_es_wr_ghcb_msr(u64 val)
29{
30 struct msr m;
31
32 m.q = val;
33 boot_wrmsr(MSR_AMD64_SEV_ES_GHCB, m: &m);
34}
35
36#else
37
38static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
39static inline u64 sev_get_status(void) { return 0; }
40static inline bool early_is_sevsnp_guest(void) { return false; }
41
42#endif
43
44#endif
45

source code of linux/arch/x86/boot/compressed/sev.h