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OpenHarmony-2.DeviceInfo适配

  • DeviceInfo适配说明

1.启动子系统设备信息说明
在这里插入图片描述

2.OHOS

2.1.OHOS 固定值参数适配

  • OHOS 固定值参数:
const.ohos.version.security_patch
const.ohos.releasetype
const.ohos.apiversion
const.ohos.fullname
  • 适配说明:
    OHOS 固定值参数由OHOS系统填充,厂商不能也不需适配,参数主要定义:
/base/startup/init/services/etc/param/ohos_const/ohos.para:
 13 const.ohos.version.security_patch=2024/08/01
 14 const.ohos.releasetype=Release
 15 const.ohos.apiversion=11
 16 const.ohos.fullname=OpenHarmony-4.1.7.8

2.2.厂商固定值参数适配:

  • 厂商固定值参数:
const.product.devicetype
const.product.manufacturer
const.product.brand
const.product.name
const.build.product
const.product.model
const.software.model
const.product.hardwareversion
const.product.hardwareprofile
const.product.software.version
const.product.bootloader.version
const.build.characteristics
... ...
  • 适配说明:

  由各产品根据自身情况在vendor目录下适配。

  • 标准系统以RK3568为例,在/vendor/hihope/rk3568/etc/para/hardware_rk3568.para中适配,并安装到指定目录。
vendor/hihope/rk3568/etc/param/hardware_rk3568.para :
const.product.hardwareversion=default

 vendor/hihope/rk3568/etc/BUILD.gn:
 16 ohos_prebuilt_etc("para_for_chip_prod") {
 17   source = "./param/hardware_rk3568.para"
 18   install_images = [ chip_prod_base_dir ]
 19   relative_install_dir = "param"
 20   part_name = "product_rk3568"
 21 }

3.厂商动态参数适配

  厂商动态值参数,目前有三种获取形式:cmdline读取,编译宏定义,在BUILD.gn中定义。

  • cmdline中读取的值有:ohos.boot.hardware、ohos.boot.bootslots、ohos.boot.sn等,其中ohos.boot.sn的获取略有不同,具体如下:

    • 标准系统 Serial从参数ohos.boot.sn读取。
      ohos.boot.sn参数值的获取方式:首先从cmdline(由uboot生成)获取,如果获取到的是sn值则直接读取,若获取的是文件路径,则从文件中读取;当获取不到时从默认的Sn文件读取,默认文件为:/sys/block/mmcblk0/device/cid;/proc/bootdevice/cid。

    • 轻量系统与小型系统的Serial各产品在实现过程中可能有自己特殊的算法,因此OpenHarmony支持在hals/utils/sys_param目录下hal_sys_param.c文件中通过HalGetSerial()接口自定算法来获取Serial。

  • 在BUILD.gn中定义,参考文件/base/startup/init/services/etc/BUILD.gn

4.代码分析

startup/init/services/init/standard/init.c :

SystemConfig->LoadSpecialParam

429 void LoadSpecialParam(void)
430 {
431     // read param area size from cfg and save to dac
432     LoadParamAreaSize();
433     // read selinux label
434     LoadSelinuxLabel("init");
435     // from cmdline
436     LoadParamFromCmdLine();
437     // from build
438     LoadParamFromBuild();
439 }
  • LoadParamAreaSize
startup/init/services/etc/param/ohos.para.size:
 14 default_param=4096
 15 hilog_param=40960
 16 const_product_param=4096
 17 startup_param=40960
 18 persist_param=40960
 19 const_param=40960
 20 persist_sys_param=4096
 21 devinfo_public_param=40960
 22 sys_param=4096
 23 bootevent_param=4096
 24 startup_init_param=81920
 25 hiviewdfx_profiler_param=2048
 26 ohos_boot_param = 8192
 27 bluetooth_param = 8192
 28 hiviewdfx_hiview_param = 2048
 29 telephony_param = 20480
 30 vendor_camera_param=6144
 31 edm_writable_param = 4096
  • LoadParamFromCmdLine
startup/init/services/param/manager/param_server.c:
230 INIT_LOCAL_API int LoadParamFromCmdLine(void)
231 {
232     CmdLineIteratorCtx ctx;
233
234     ctx.gotSn = false;
235     ctx.cmdline = ReadFileData(BOOT_CMD_LINE);
236     PARAM_CHECK(ctx.cmdline != NULL, return -1, "Failed to read file %s", BOOT_CMD_LINE);
237
238     IterateNameValuePairs(ctx.cmdline, CmdlineIterator, (void *)(&ctx));
239
240     // sn is critical, it must be specified
241     if (!ctx.gotSn) {
242         PARAM_LOGE("Generate default sn now ...");
243         GenerateSnByDefault();
244     }
245
246     free(ctx.cmdline);
247     return 0;
248 }

215 static void GenerateSnByDefault(void)
216 {
217     const char *snFileList [] = {
218         "/sys/block/mmcblk0/device/cid",
219         "/proc/bootdevice/cid"
220     };
221
222     for (size_t i = 0; i < ARRAY_LENGTH(snFileList); i++) {
223         int ret = ReadSnFromFile(OHOS_CMDLINE_PARA_PREFIX "sn", snFileList[i]);
224         if (ret == 0) {
225             break;
226         }
227     }
228 }

refer to

  • docs/en/device-dev/subsystems/subsys-boot-init-deviceInfo.md
  • https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/subsystems/subsys-boot-init-deviceInfo.md

原文地址:https://blog.csdn.net/weixin_41028621/article/details/143849507

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