structs.h

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/*
 * Copyright (c) 2025 Intel
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_X86_STRUCTS_H_
#define ZEPHYR_INCLUDE_X86_STRUCTS_H_
 
#include <stdint.h>
 
struct k_thread;
 
/* Per CPU architecture specifics (empty) */
struct _cpu_arch {
 
#if defined(CONFIG_FPU_SHARING)
        /*
         * A 'sse_owner' field does not exist in addition to the 'fpu_owner'
         * field since it's not possible to divide the IA-32 non-integer
         * registers into 2 distinct blocks owned by differing threads.  In
         * other words, given that the 'fxnsave/fxrstor' instructions
         * save/restore both the X87 FPU and XMM registers, it's not possible
         * for a thread to only "own" the XMM registers.
         */
 
        struct k_thread *fpu_owner;
#endif
#if defined(CONFIG_HW_SHADOW_STACK)
        long *shstk_addr; /* Latest top of shadow stack */
        long *shstk_base; /* Base of shadow stack */
        size_t shstk_size;
#endif
#if defined(__cplusplus) && !defined(CONFIG_FPU_SHARING) && \
                !defined(CONFIG_HW_SHADOW_STACK)
        /* Ensure this struct does not have a size of 0 which is not allowed in C++. */
        uint8_t dummy;
#endif
};
 
#endif /* ZEPHYR_INCLUDE_X86_STRUCTS_H_ */