arm_cpu.h

/*
 * SPDX-FileCopyrightText: 2014 Freie Universität Berlin
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once
 
#include <stdint.h>
#include "VIC.h"
#include "arm7_common.h"
 
#ifdef __cplusplus
 extern "C" {
#endif
 
#define NEW_TASK_CPSR 0x1F
#define WORDSIZE 32
 
uint32_t get_system_speed(void);
void cpu_clock_scale(uint32_t source, uint32_t target, uint32_t *prescale);
 
void arm_reset(void);

static inline uintptr_t cpu_get_caller_pc(void)
{
    register uintptr_t lr_ptr;
 
    __asm__ __volatile__ ("mov %0, lr" : "=r" (lr_ptr));
    return lr_ptr;
}

#define STACK_CANARY_WORD   (0xEAFFFFFEu)

#ifdef __ARM_FEATURE_CLZ
#define BITARITHM_LSB_BUILTIN
#define BITARITHM_HAS_CLZ
#else
#define BITARITHM_LSB_LOOKUP
#endif
 
#ifdef __cplusplus
}
#endif