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 15 void snp_accept_memory(phys_addr_t start, phys_addr_t end); 16 u64 sev_get_status(void); 17 bool early_is_sevsnp_guest(void); 18 19 static inline u64 sev_es_rd_ghcb_msr(void) 20 { 21 struct msr m; 22 23 boot_rdmsr(MSR_AMD64_SEV_ES_GHCB, &m); 24 25 return m.q; 26 } 27 28 static 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); 34 } 35 36 #else 37 38 static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } 39 static inline u64 sev_get_status(void) { return 0; } 40 static inline bool early_is_sevsnp_guest(void) { return false; } 41 42 #endif 43 44 #endif 45