save_state.h

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#ifndef __CPU_X86_SAVE_STATE_H__
#define __CPU_X86_SAVE_STATE_H__
 
#include <stdint.h>
 
enum cpu_reg {
        RAX,
        RBX,
        RCX,
        RDX
};
 
#define SMM_REV_INVALID 0xffffffff
 
struct smm_save_state_ops {
        const uint32_t *revision_table;
        /* Accessors for CPU registers in the SMM save state
           Returns -1 on failure, 0 on success */
        int (*get_reg)(const enum cpu_reg reg, const int node, void *out, const uint8_t length);
        int (*set_reg)(const enum cpu_reg reg, const int node, void *in, const uint8_t length);
        /* Returns -1 on failure, the node on which the 'cmd' was send on success */
        int (*apmc_node)(u8 cmd);
};
 
/* Return -1 on failure, otherwise returns which CPU node issued an APMC IO write */
int get_apmc_node(u8 cmd);
/* Return -1 on failure, 0 on success.
   Accessors for the SMM save state CPU registers RAX, RBX, RCX and RDX */
int get_save_state_reg(const enum cpu_reg reg, const int node, void *out, const uint8_t length);
int set_save_state_reg(const enum cpu_reg reg, const int node, void *in, const uint8_t length);
 
#endif /* __CPU_X86_SAVE_STATE_H__ */