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_SLOTS >> 3)
#else
#define RISCV_PMP_CFG_NUM       (CONFIG_PMP_SLOTS >> 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 */
 
/*
 * The following structure defines the list of registers that need to be
 * saved/restored when a context switch occurs.
 */
struct _callee_saved {
        ulong_t sp;     /* Stack pointer, (x2 register) */
        ulong_t ra;     /* return address */
        ulong_t tp;     /* thread pointer */
 
        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;
 
#define PMP_M_MODE_SLOTS 8      /* 8 is plenty enough for m-mode */
 
struct _thread_arch {
#ifdef CONFIG_USERSPACE
        ulong_t priv_stack_start;
        ulong_t u_mode_pmpaddr_regs[CONFIG_PMP_SLOTS];
        ulong_t u_mode_pmpcfg_regs[CONFIG_PMP_SLOTS / sizeof(ulong_t)];
        unsigned int u_mode_pmp_domain_offset;
        unsigned int u_mode_pmp_end_index;
        unsigned int u_mode_pmp_update_nr;
#endif
#ifdef CONFIG_PMP_STACK_GUARD
        unsigned int m_mode_pmp_end_index;
        ulong_t m_mode_pmpaddr_regs[PMP_M_MODE_SLOTS];
        ulong_t m_mode_pmpcfg_regs[PMP_M_MODE_SLOTS / sizeof(ulong_t)];
#endif
};
 
typedef struct _thread_arch _thread_arch_t;
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_RISCV_THREAD_H_ */