arch.h

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/*
 * Copyright (c) 2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_NIOS2_ARCH_H_
#define ZEPHYR_INCLUDE_ARCH_NIOS2_ARCH_H_
 
#include <system.h>
 
#include <arch/nios2/thread.h>
#include <arch/nios2/asm_inline.h>
#include <arch/common/addr_types.h>
#include <devicetree.h>
#include <arch/nios2/nios2.h>
#include <arch/common/sys_bitops.h>
#include <sys/sys_io.h>
#include <arch/common/ffs.h>
 
#define ARCH_STACK_PTR_ALIGN  4
 
#ifndef _ASMLANGUAGE
#include <zephyr/types.h>
#include <irq.h>
#include <sw_isr_table.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* There is no notion of priority with the Nios II internal interrupt
 * controller and no flags are currently supported.
 */
#define ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
{ \
        Z_ISR_DECLARE(irq_p, 0, isr_p, isr_param_p); \
}
 
extern void z_irq_spurious(const void *unused);
 
static ALWAYS_INLINE unsigned int arch_irq_lock(void)
{
        unsigned int key, tmp;
 
        __asm__ volatile (
            "rdctl %[key], status\n\t"
            "movi %[tmp], -2\n\t"
            "and %[tmp], %[key], %[tmp]\n\t"
            "wrctl status, %[tmp]\n\t"
            : [key] "=r" (key), [tmp] "=r" (tmp)
            : : "memory");
 
        return key;
}
 
static ALWAYS_INLINE void arch_irq_unlock(unsigned int key)
{
        /* If the CPU is built without certain features, then
         * the only writable bit in the status register is PIE
         * in which case we can just write the value stored in key,
         * all the other writable bits will be the same.
         *
         * If not, other stuff could have changed and we need to
         * specifically flip just that bit.
         */
 
#if (ALT_CPU_NUM_OF_SHADOW_REG_SETS > 0) || \
                (defined ALT_CPU_EIC_PRESENT) || \
                (defined ALT_CPU_MMU_PRESENT) || \
                (defined ALT_CPU_MPU_PRESENT)
        __asm__ volatile (
            "andi %[key], %[key], 1\n\t"
            "beq %[key], zero, 1f\n\t"
            "rdctl %[key], status\n\t"
            "ori %[key], %[key], 1\n\t"
            "wrctl status, %[key]\n\t"
            "1:\n\t"
            : [key] "+r" (key)
            : : "memory");
#else
        __asm__ volatile (
            "wrctl status, %[key]"
            : : [key] "r" (key)
            : "memory");
#endif
}
 
static ALWAYS_INLINE bool arch_irq_unlocked(unsigned int key)
{
        return key & 1;
}
 
void arch_irq_enable(unsigned int irq);
void arch_irq_disable(unsigned int irq);
 
struct __esf {
        uint32_t ra; /* return address r31 */
        uint32_t r1; /* at */
        uint32_t r2; /* return value */
        uint32_t r3; /* return value */
        uint32_t r4; /* register args */
        uint32_t r5; /* register args */
        uint32_t r6; /* register args */
        uint32_t r7; /* register args */
        uint32_t r8; /* Caller-saved general purpose */
        uint32_t r9; /* Caller-saved general purpose */
        uint32_t r10; /* Caller-saved general purpose */
        uint32_t r11; /* Caller-saved general purpose */
        uint32_t r12; /* Caller-saved general purpose */
        uint32_t r13; /* Caller-saved general purpose */
        uint32_t r14; /* Caller-saved general purpose */
        uint32_t r15; /* Caller-saved general purpose */
        uint32_t estatus;
        uint32_t instr; /* Instruction being executed when exc occurred */
};
 
typedef struct __esf z_arch_esf_t;
 
FUNC_NORETURN void z_SysFatalErrorHandler(unsigned int reason,
                                         const z_arch_esf_t *esf);
 
FUNC_NORETURN void z_NanoFatalErrorHandler(unsigned int reason,
                                          const z_arch_esf_t *esf);
 
enum nios2_exception_cause {
        NIOS2_EXCEPTION_UNKNOWN                      = -1,
        NIOS2_EXCEPTION_RESET                        = 0,
        NIOS2_EXCEPTION_CPU_ONLY_RESET_REQUEST       = 1,
        NIOS2_EXCEPTION_INTERRUPT                    = 2,
        NIOS2_EXCEPTION_TRAP_INST                    = 3,
        NIOS2_EXCEPTION_UNIMPLEMENTED_INST           = 4,
        NIOS2_EXCEPTION_ILLEGAL_INST                 = 5,
        NIOS2_EXCEPTION_MISALIGNED_DATA_ADDR         = 6,
        NIOS2_EXCEPTION_MISALIGNED_TARGET_PC         = 7,
        NIOS2_EXCEPTION_DIVISION_ERROR               = 8,
        NIOS2_EXCEPTION_SUPERVISOR_ONLY_INST_ADDR    = 9,
        NIOS2_EXCEPTION_SUPERVISOR_ONLY_INST         = 10,
        NIOS2_EXCEPTION_SUPERVISOR_ONLY_DATA_ADDR    = 11,
        NIOS2_EXCEPTION_TLB_MISS                     = 12,
        NIOS2_EXCEPTION_TLB_EXECUTE_PERM_VIOLATION   = 13,
        NIOS2_EXCEPTION_TLB_READ_PERM_VIOLATION      = 14,
        NIOS2_EXCEPTION_TLB_WRITE_PERM_VIOLATION     = 15,
        NIOS2_EXCEPTION_MPU_INST_REGION_VIOLATION    = 16,
        NIOS2_EXCEPTION_MPU_DATA_REGION_VIOLATION    = 17,
        NIOS2_EXCEPTION_ECC_TLB_ERR                  = 18,
        NIOS2_EXCEPTION_ECC_FETCH_ERR                = 19,
        NIOS2_EXCEPTION_ECC_REGISTER_FILE_ERR        = 20,
        NIOS2_EXCEPTION_ECC_DATA_ERR                 = 21,
        NIOS2_EXCEPTION_ECC_DATA_CACHE_WRITEBACK_ERR = 22
};
 
/* Bitfield indicating which exception cause codes report a valid
 * badaddr register. NIOS2_EXCEPTION_TLB_MISS and NIOS2_EXCEPTION_ECC_TLB_ERR
 * are deliberately not included here, you need to check if TLBMISC.D=1
 */
#define NIOS2_BADADDR_CAUSE_MASK \
        (BIT(NIOS2_EXCEPTION_SUPERVISOR_ONLY_DATA_ADDR) | \
         BIT(NIOS2_EXCEPTION_MISALIGNED_DATA_ADDR) | \
         BIT(NIOS2_EXCEPTION_MISALIGNED_TARGET_PC) | \
         BIT(NIOS2_EXCEPTION_TLB_READ_PERM_VIOLATION) | \
         BIT(NIOS2_EXCEPTION_TLB_WRITE_PERM_VIOLATION) | \
         BIT(NIOS2_EXCEPTION_MPU_DATA_REGION_VIOLATION) | \
         BIT(NIOS2_EXCEPTION_ECC_DATA_ERR))
 
 
extern uint32_t sys_clock_cycle_get_32(void);
 
static inline uint32_t arch_k_cycle_get_32(void)
{
        return sys_clock_cycle_get_32();
}
 
static ALWAYS_INLINE void arch_nop(void)
{
        __asm__ volatile("nop");
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_NIOS2_ARCH_H_ */