/*
 * Copyright (c) 2021, Shenzhen Academy of Aerospace Technology
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-11-16     Dystopia     the first version
 */

#ifndef __TRAP_H__
#define __TRAP_H__

#include "c66xx.h"

/*
 * exception operation macro
 */
#define disable_exception()
#define get_except_type()       EFR
#define ack_exception(type)     ECR = 1ul << (type)
#define get_iexcept()           IERR
#define set_iexcept(mask)       IERR = (mask)

/*
 * exception types
 */
#define EXCEPT_TYPE_NXF   31       /* NMI */
#define EXCEPT_TYPE_EXC   30       /* external exception */
#define EXCEPT_TYPE_IXF   1        /* internal exception */
#define EXCEPT_TYPE_SXF   0        /* software exception */

#define EXCEPT_CAUSE_LBX  (1 << 7) /* loop buffer exception */
#define EXCEPT_CAUSE_PRX  (1 << 6) /* privilege exception */
#define EXCEPT_CAUSE_RAX  (1 << 5) /* resource access exception */
#define EXCEPT_CAUSE_RCX  (1 << 4) /* resource conflict exception */
#define EXCEPT_CAUSE_OPX  (1 << 3) /* opcode exception */
#define EXCEPT_CAUSE_EPX  (1 << 2) /* execute packet exception */
#define EXCEPT_CAUSE_FPX  (1 << 1) /* fetch packet exception */
#define EXCEPT_CAUSE_IFX  (1 << 0) /* instruction fetch exception */

enum SYSTEM_TRAP_CODE
{
    ABORT_BUS_ADDRERR = 0,  // bus address error
    ABORT_BUS_ACCERR,       // bus access permission error
    ABORT_OPCODE_ILL,       // illegal opcode
    ABORT_PRVREG_ILL,       // privilege register
    ABORT_PRVOPC_ILL,       // privileged opcode
    ABORT_ILLTRP_ILL,       // illegal trap
    ABORT_BRKPT_ILL,        // handling breakpoints
};

/*
 * abort types
 */
#define ABORT_TYPE_BUS        0           // bus access abnormal
#define ABORT_TYPE_MAP        1           // page table mapping error
#define ABORT_TYPE_UNDDEF     0xff        // undefined exception
#define ABORT_TYPE_FATAL      0xffffffff  // fatal error

struct rt_exception_info {
    char *kernel_str;
    int type;
    int code;
};

#define BKPT_OPCODE        0x56454314    /* illegal opcode */
#define INTC_MEXPMASK    __SYSREGA(0x018000e0, unsigned int)

#define __ffs(a)    (_lmbd(1, _bitr(a)))
#define __fls(a)    (!(a) ? 0 : (32 - _lmbd(1, (a))))

extern void rt_trap_init(void);

#endif /* __TRAP_H__ */