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/* SPDX-License-Identifier: GPL-2.0 */
/*
* AMD SEV header for early boot related functions.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*/
#ifndef BOOT_COMPRESSED_SEV_H
#define BOOT_COMPRESSED_SEV_H
#ifdef CONFIG_AMD_MEM_ENCRYPT
#include <asm/shared/msr.h>
void snp_accept_memory(phys_addr_t start, phys_addr_t end);
u64 sev_get_status(void);
bool early_is_sevsnp_guest(void);
static inline u64 sev_es_rd_ghcb_msr(void)
{
struct msr m;
raw_rdmsr(MSR_AMD64_SEV_ES_GHCB, &m);
return m.q;
}
static inline void sev_es_wr_ghcb_msr(u64 val)
{
struct msr m;
m.q = val;
raw_wrmsr(MSR_AMD64_SEV_ES_GHCB, &m);
}
#else
static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
static inline u64 sev_get_status(void) { return 0; }
static inline bool early_is_sevsnp_guest(void) { return false; }
#endif
#endif
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