platform.h

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/*
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

 
#ifndef _PICO_PLATFORM_H
#define _PICO_PLATFORM_H
 
#ifndef _PICO_H
#error pico/platform.h should not be included directly; include pico.h instead
#endif
 
#include "pico/platform/compiler.h"
#include "pico/platform/sections.h"
#include "pico/platform/panic.h"
#include "pico/platform/common.h"
#include "hardware/regs/addressmap.h"
#include "hardware/regs/sio.h"
 
// PICO_CONFIG: PICO_STACK_SIZE, Minimum amount of stack space reserved in the linker script for each core. See also PICO_CORE1_STACK_SIZE, min=0x100, default=0x800, advanced=true, group=pico_platform
#ifndef PICO_STACK_SIZE
#define PICO_STACK_SIZE _u(0x800)
#endif
 
// PICO_CONFIG: PICO_HEAP_SIZE, Minimum amount of heap space reserved by the linker script, min=0x100, default=0x800, advanced=true, group=pico_platform
#ifndef PICO_HEAP_SIZE
#define PICO_HEAP_SIZE _u(0x800)
#endif
 
// PICO_CONFIG: PICO_NO_RAM_VECTOR_TABLE, Enable/disable the RAM vector table, type=bool, default=0, advanced=true, group=pico_platform
#ifndef PICO_NO_RAM_VECTOR_TABLE
#define PICO_NO_RAM_VECTOR_TABLE 0
#endif
 
// PICO_CONFIG: PICO_RP2040_B0_SUPPORTED, Whether to include any specific software support for RP2040 B0 revision, type=bool, default=1, advanced=true, group=pico_platform
#ifndef PICO_RP2040_B0_SUPPORTED
#define PICO_RP2040_B0_SUPPORTED 1
#endif
 
// PICO_CONFIG: PICO_FLOAT_SUPPORT_ROM_V1, Include float support code for RP2040 B0 when that chip revision is supported , type=bool, default=1, advanced=true, group=pico_platform
#ifndef PICO_FLOAT_SUPPORT_ROM_V1
#define PICO_FLOAT_SUPPORT_ROM_V1 1
#endif
 
// PICO_CONFIG: PICO_DOUBLE_SUPPORT_ROM_V1, Include double support code for RP2040 B0 when that chip revision is supported , type=bool, default=1, advanced=true, group=pico_platform
#ifndef PICO_DOUBLE_SUPPORT_ROM_V1
#define PICO_DOUBLE_SUPPORT_ROM_V1 1
#endif
 
// PICO_CONFIG: PICO_RP2040_B1_SUPPORTED, Whether to include any specific software support for RP2040 B1 revision, type=bool, default=1, advanced=true, group=pico_platform
#ifndef PICO_RP2040_B1_SUPPORTED
#define PICO_RP2040_B1_SUPPORTED 1
#endif
 
// PICO_CONFIG: PICO_RP2040_B2_SUPPORTED, Whether to include any specific software support for RP2040 B2 revision, type=bool, default=1, advanced=true, group=pico_platform
#ifndef PICO_RP2040_B2_SUPPORTED
#define PICO_RP2040_B2_SUPPORTED 1
#endif
 
// PICO_CONFIG: PICO_CLKDIV_ROUND_NEAREST, True if floating point clock divisors should be rounded to the nearest possible clock divisor by default rather than rounding down, type=bool, default=1, group=pico_platform
#ifndef PICO_CLKDIV_ROUND_NEAREST
#define PICO_CLKDIV_ROUND_NEAREST 1
#endif
 
#ifndef __ASSEMBLER__
 
#ifdef __cplusplus
extern "C" {
#endif
static inline void busy_wait_at_least_cycles(uint32_t minimum_cycles) {
    pico_default_asm_volatile(
        "1: subs %0, #3\n"
        "bcs 1b\n"
    : "+l" (minimum_cycles) : : "cc", "memory"
    );
}

static __force_inline void __breakpoint(void) {
    pico_default_asm_volatile ("bkpt #0" : : : "memory");
}

__force_inline static uint get_core_num(void) {
    return (*(uint32_t *) (SIO_BASE + SIO_CPUID_OFFSET));
}

static __force_inline uint __get_current_exception(void) {
    uint exception;
    pico_default_asm_volatile ( "mrs %0, ipsr" : "=l" (exception));
    return exception;
}

uint8_t rp2040_chip_version(void);

static inline uint8_t rp2040_rom_version(void) {
    GCC_Pragma("GCC diagnostic push")
    GCC_Pragma("GCC diagnostic ignored \"-Warray-bounds\"")
    return *(uint8_t*)0x13;
    GCC_Pragma("GCC diagnostic pop")
}

__force_inline static int32_t __mul_instruction(int32_t a, int32_t b) {
#ifdef __riscv
__asm ("mul %0, %0, %1" : "+l" (a) : "l" (b) : );
#else
pico_default_asm ("muls %0, %1"     : "+l" (a) : "l" (b) : "cc");
#endif
return a;
}

#define __fast_mul(a, b) __builtin_choose_expr(__builtin_constant_p(b) && !__builtin_constant_p(a), \
    (__builtin_popcount(b) >= 2 ? __mul_instruction(a,b) : (a)*(b)), \
    (a)*(b))
 
#ifdef __cplusplus
}
#endif
 
#endif // __ASSEMBLER__
 
#endif