thread.h

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/*
 * Copyright (c) 2017 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_RISCV_THREAD_H_
#define ZEPHYR_INCLUDE_ARCH_RISCV_THREAD_H_
 
#ifndef _ASMLANGUAGE
#include <zephyr/types.h>
 
#if !defined(RV_FP_TYPE) && defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
#ifdef CONFIG_CPU_HAS_FPU_DOUBLE_PRECISION
#define RV_FP_TYPE uint64_t
#else
#define RV_FP_TYPE uint32_t
#endif
#endif
 
#ifdef CONFIG_RISCV_PMP
#ifdef CONFIG_64BIT
#define RISCV_PMP_CFG_NUM       (CONFIG_PMP_SLOT >> 3)
#else
#define RISCV_PMP_CFG_NUM       (CONFIG_PMP_SLOT >> 2)
#endif
#endif
 
#ifdef CONFIG_PMP_STACK_GUARD
/*
 * PMP entries:
 *   (1 for interrupt stack guard: None)
 *   4 for stacks guard: None
 *   1 for RAM: RW
 *   1 for other address space: RWX
 */
#define PMP_REGION_NUM_FOR_STACK_GUARD  6
#define PMP_CFG_CSR_NUM_FOR_STACK_GUARD 2
#endif /* CONFIG_PMP_STACK_GUARD */
 
#ifdef CONFIG_PMP_POWER_OF_TWO_ALIGNMENT
#ifdef CONFIG_USERSPACE
#ifdef CONFIG_PMP_STACK_GUARD
/*
 * 1 for interrupt stack guard: None
 * 1 for core state: R
 * 1 for program and read only data: RX
 * 1 for user thread stack: RW
 */
#define PMP_REGION_NUM_FOR_U_THREAD     4
#else /* CONFIG_PMP_STACK_GUARD */
/*
 * 1 for core state: R
 * 1 for program and read only data: RX
 * 1 for user thread stack: RW
 */
#define PMP_REGION_NUM_FOR_U_THREAD     3
#endif /* CONFIG_PMP_STACK_GUARD */
#define PMP_MAX_DYNAMIC_REGION  (CONFIG_PMP_SLOT - PMP_REGION_NUM_FOR_U_THREAD)
#endif /* CONFIG_USERSPACE */
 
#else /* CONFIG_PMP_POWER_OF_TWO_ALIGNMENT */
 
#ifdef CONFIG_USERSPACE
#ifdef CONFIG_PMP_STACK_GUARD
/*
 * 1 for interrupt stack guard: None
 * 1 for core state: R
 * 2 for program and read only data: RX
 * 2 for user thread stack: RW
 */
#define PMP_REGION_NUM_FOR_U_THREAD     6
#else /* CONFIG_PMP_STACK_GUARD */
/*
 * 1 for core state: R
 * 2 for program and read only data: RX
 * 2 for user thread stack: RW
 */
#define PMP_REGION_NUM_FOR_U_THREAD     5
#endif /* CONFIG_PMP_STACK_GUARD */
#define PMP_MAX_DYNAMIC_REGION  ((CONFIG_PMP_SLOT - \
                                PMP_REGION_NUM_FOR_U_THREAD) >> 1)
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_PMP_POWER_OF_TWO_ALIGNMENT */
 
/*
 * The following structure defines the list of registers that need to be
 * saved/restored when a cooperative context switch occurs.
 */
struct _callee_saved {
        ulong_t sp;     /* Stack pointer, (x2 register) */
 
        ulong_t s0;     /* saved register/frame pointer */
        ulong_t s1;     /* saved register */
        ulong_t s2;     /* saved register */
        ulong_t s3;     /* saved register */
        ulong_t s4;     /* saved register */
        ulong_t s5;     /* saved register */
        ulong_t s6;     /* saved register */
        ulong_t s7;     /* saved register */
        ulong_t s8;     /* saved register */
        ulong_t s9;     /* saved register */
        ulong_t s10;    /* saved register */
        ulong_t s11;    /* saved register */
 
#if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
        uint32_t fcsr;          /* Control and status register */
        RV_FP_TYPE fs0;         /* saved floating-point register */
        RV_FP_TYPE fs1;         /* saved floating-point register */
        RV_FP_TYPE fs2;         /* saved floating-point register */
        RV_FP_TYPE fs3;         /* saved floating-point register */
        RV_FP_TYPE fs4;         /* saved floating-point register */
        RV_FP_TYPE fs5;         /* saved floating-point register */
        RV_FP_TYPE fs6;         /* saved floating-point register */
        RV_FP_TYPE fs7;         /* saved floating-point register */
        RV_FP_TYPE fs8;         /* saved floating-point register */
        RV_FP_TYPE fs9;         /* saved floating-point register */
        RV_FP_TYPE fs10;        /* saved floating-point register */
        RV_FP_TYPE fs11;        /* saved floating-point register */
#endif
};
typedef struct _callee_saved _callee_saved_t;
 
struct _thread_arch {
        uint32_t swap_return_value; /* Return value of z_swap() */
 
#ifdef CONFIG_PMP_STACK_GUARD
        ulong_t s_pmpcfg[PMP_CFG_CSR_NUM_FOR_STACK_GUARD];
        ulong_t s_pmpaddr[PMP_REGION_NUM_FOR_STACK_GUARD];
#endif
 
#ifdef CONFIG_USERSPACE
        ulong_t priv_stack_start;
        ulong_t user_sp;
        ulong_t unfinished_syscall;
        ulong_t u_pmpcfg[RISCV_PMP_CFG_NUM];
        ulong_t u_pmpaddr[CONFIG_PMP_SLOT];
#endif
};
 
typedef struct _thread_arch _thread_arch_t;
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_RISCV_THREAD_H_ */