los_vm_boot.c

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/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include "los_vm_boot.h"
#include "los_config.h"
#include "los_base.h"
#include "los_vm_zone.h"
#include "los_vm_map.h"
#include "los_memory_pri.h"
#include "los_vm_page.h"
#include "los_arch_mmu.h"
 
/**
 * @brief 虚拟内存区间检查, 需理解 los_vm_zone.h 中画出的鸿蒙虚拟内存全景图
 */
 
UINTPTR g_vmBootMemBase = (UINTPTR)&__bss_end; ///< 内核空间可用于分配的区域,紧挨着.bss区
BOOL g_kHeapInited = FALSE; ///< 内核堆区初始化变量
 
 
///< 开机引导分配器分配内存,只有开机时采用的分配方式
VOID *OsVmBootMemAlloc(size_t len)
{
    UINTPTR ptr;
 
    if (g_kHeapInited) {
        VM_ERR("kernel heap has been initialized, do not to use boot memory allocation!");
        return NULL;
    }
 
    ptr = LOS_Align(g_vmBootMemBase, sizeof(UINTPTR));//对齐
    g_vmBootMemBase = ptr + LOS_Align(len, sizeof(UINTPTR));//通过改变 g_vmBootMemBase来获取内存
    //这样也行,g_vmBootMemBase 真是野蛮粗暴
    return (VOID *)ptr;
}
///整个系统内存初始化
UINT32 OsSysMemInit(VOID)
{
    STATUS_T ret;
 
#ifdef LOSCFG_KERNEL_VM
    OsKSpaceInit();//内核空间初始化
#endif
 
    ret = OsKHeapInit(OS_KHEAP_BLOCK_SIZE);// 内核堆空间初始化 512K   
    if (ret != LOS_OK) {
        VM_ERR("OsKHeapInit fail\n");
        return LOS_NOK;
    }
 
#ifdef LOSCFG_KERNEL_VM
    OsVmPageStartup();// 物理内存初始化
    g_kHeapInited = TRUE;   //内核堆区初始化完成
    OsInitMappingStartUp();//映射初始化
#else
    g_kHeapInited = TRUE;//内核堆区完成初始化
#endif
    return LOS_OK;
}