los_bootargs.c 文件参考

浏览源代码.

函数
INT32	LOS_GetCmdLine (VOID)
	读取环境变量bootcmd 来启动内核 更多...
VOID	LOS_FreeCmdLine (VOID)
STATIC INT32	GetBootargs (CHAR **args)
	获取boot参数 更多...
INT32	LOS_ParseBootargs (VOID)
	解析boot参数 更多...
INT32	LOS_GetArgValue (CHAR *argName, CHAR **argValue)
UINT64	LOS_GetAlignsize (VOID)
UINT64	LOS_SizeStrToNum (CHAR *value)

变量
STATIC CHAR *	g_cmdLine = NULL
STATIC UINT64	g_alignSize = 0
STATIC struct BootArgs	g_bootArgs [MAX_ARGS_NUM] = {0}

函数说明

GetBootargs()

STATIC INT32 GetBootargs

(

CHAR **

args

)

获取boot参数

在文件 los_bootargs.c 第 129 行定义.

{
#ifdef LOSCFG_BOOTENV_RAM
    *args = OsGetArgsAddr();
    return LOS_OK;
#else
    INT32 i;
    INT32 len = 0;
    CHAR *tmp = NULL;
    const CHAR *bootargsName = "bootargs=";
 
    if (g_cmdLine == NULL) {
        PRINT_ERR("Should call LOS_GetCmdLine() first!\n");
        return LOS_NOK;
    }
 
    for (i = 0; i < COMMAND_LINE_SIZE; i += len + 1) {
        len = strlen(g_cmdLine + i);
        tmp = strstr(g_cmdLine + i, bootargsName);
        if (tmp != NULL) {
            *args = tmp + strlen(bootargsName);
            return LOS_OK;
        }
    }
    PRINT_ERR("Cannot find bootargs!\n");
    return LOS_NOK;
#endif
}

函数调用图:

这是这个函数的调用关系图:

LOS_FreeCmdLine()

VOID LOS_FreeCmdLine

(

VOID

)

在文件 los_bootargs.c 第 121 行定义.

{
    if (g_cmdLine != NULL) {
        free(g_cmdLine);
        g_cmdLine = NULL;
    }
}

函数调用图:

LOS_GetAlignsize()

UINT64 LOS_GetAlignsize

(

VOID

)

在文件 los_bootargs.c 第 207 行定义.

{
    return g_alignSize;
}

这是这个函数的调用关系图:

LOS_GetArgValue()

INT32 LOS_GetArgValue	(	CHAR *	argName,
		CHAR **	argValue
	)

在文件 los_bootargs.c 第 189 行定义.

{
    INT32 idx = 0;
 
    while (idx < MAX_ARGS_NUM) {
        if (g_bootArgs[idx].argName == NULL) {
            break;
        }
        if (strcmp(argName, g_bootArgs[idx].argName) == 0) {
            *argValue = g_bootArgs[idx].argValue;
            return LOS_OK;
        }
        idx++;
    }
 
    return LOS_NOK;
}

这是这个函数的调用关系图:

LOS_GetCmdLine()

INT32 LOS_GetCmdLine

(

VOID

)

读取环境变量bootcmd 来启动内核

在文件 los_bootargs.c 第 51 行定义.

{
    int ret;
 
    g_cmdLine = (CHAR *)malloc(COMMAND_LINE_SIZE);
    if (g_cmdLine == NULL) {
        PRINT_ERR("Malloc g_cmdLine space error!\n");
        return LOS_NOK;
    }
 
#ifdef LOSCFG_STORAGE_EMMC
    los_disk *emmcDisk = los_get_mmcdisk_bytype(EMMC); //获取硬盘信息
    if (emmcDisk == NULL) {
        PRINT_ERR("Get EMMC disk failed!\n");
        goto ERROUT;
    }
    g_alignSize = EMMC_SEC_SIZE;
    ret = los_disk_read(emmcDisk->disk_id, g_cmdLine, COMMAND_LINE_ADDR / EMMC_SEC_SIZE,
                        COMMAND_LINE_SIZE / EMMC_SEC_SIZE, TRUE);//读取命令行内容
    if (ret == 0) {
        return LOS_OK;
    }
#endif
 
#ifdef LOSCFG_STORAGE_SPINOR
    struct MtdDev *mtd = GetMtd("spinor");//获取flash描述信息
    if (mtd == NULL) {
        PRINT_ERR("Get spinor mtd failed!\n");
        goto ERROUT;
    }
    g_alignSize = mtd->eraseSize;
    ret = mtd->read(mtd, COMMAND_LINE_ADDR, COMMAND_LINE_SIZE, g_cmdLine);//读取spinor下的命令行内容
    if (ret == COMMAND_LINE_SIZE) {
        return LOS_OK;
    }
#endif
 
#ifdef LOSCFG_STORAGE_SPINAND
    struct MtdDev *mtd = GetMtd("nand");//获取flash描述信息
    if (mtd == NULL) {
        PRINT_ERR("Get nand mtd failed!\n");
        goto ERROUT;
    }
    g_alignSize = mtd->eraseSize;
    ret = mtd->read(mtd, COMMAND_LINE_ADDR, COMMAND_LINE_SIZE, g_cmdLine);//读取nand下的命令行内容
    if (ret == COMMAND_LINE_SIZE) {
        return LOS_OK;
    }
#endif
 
#ifdef LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7
    struct MtdDev *mtd = GetCfiMtdDev();
    if (mtd == NULL) {
        PRINT_ERR("Get CFI mtd failed!\n");
        goto ERROUT;
    }
    g_alignSize = mtd->eraseSize;
    ret = mtd->read(mtd, CFIFLASH_BOOTARGS_ADDR, COMMAND_LINE_SIZE, g_cmdLine);
    if (ret == COMMAND_LINE_SIZE) {
        return LOS_OK;
    }
#endif
 
    PRINT_ERR("Read cmdline error!\n");
ERROUT:
    free(g_cmdLine);
    g_cmdLine = NULL;
    return LOS_NOK;
}

函数调用图:

LOS_ParseBootargs()

INT32 LOS_ParseBootargs

(

VOID

)

解析boot参数

在文件 los_bootargs.c 第 158 行定义.

{
    INT32 idx = 0;
    INT32 ret;
    CHAR *args = NULL;
    CHAR *argName = NULL;
    CHAR *argValue = NULL;
 
    ret = GetBootargs(&args);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
 
    while ((argValue = strsep(&args, " ")) != NULL) {
        argName = strsep(&argValue, "=");
        if (argValue == NULL) {
            /* If the argument is not compliance with the format 'foo=bar' */
            g_bootArgs[idx].argName = argName;
            g_bootArgs[idx].argValue = argName;
        } else {
            g_bootArgs[idx].argName = argName;
            g_bootArgs[idx].argValue = argValue;
        }
        if (++idx >= MAX_ARGS_NUM) {
            /* Discard the rest arguments */
            break;
        }
    }
    return LOS_OK;
}

函数调用图:

LOS_SizeStrToNum()

UINT64 LOS_SizeStrToNum

(

CHAR *

value

)

在文件 los_bootargs.c 第 212 行定义.

{
    UINT64 num = 0;
 
    /* If the string is a hexadecimal value */
    if (sscanf_s(value, "0x%llx", &num) > 0) {
        value += strlen("0x");
        if (strspn(value, "0123456789abcdefABCDEF") < strlen(value)) {
            goto ERROUT;
        }
        return num;
    }
 
    /* If the string is a decimal value in unit *Bytes */
    INT32 ret = sscanf_s(value, "%d", &num);
    INT32 decOffset = strspn(value, "0123456789");
    CHAR *endPos = value + decOffset;
    if ((ret <= 0) || (decOffset < (strlen(value) - 1))) {
        goto ERROUT;
    }
 
    if (strlen(endPos) == 0) {
        return num;
    } else if (strcasecmp(endPos, "k") == 0) {
        num = num * BYTES_PER_KBYTE;
    } else if (strcasecmp(endPos, "m") == 0) {
        num = num * BYTES_PER_MBYTE;
    } else if (strcasecmp(endPos, "g") == 0) {
        num = num * BYTES_PER_GBYTE;
    } else {
        goto ERROUT;
    }
 
    return num;
 
ERROUT:
    PRINT_ERR("Invalid value string \"%s\"!\n", value);
    return num;
}

这是这个函数的调用关系图:

变量说明

g_alignSize

STATIC UINT64 g_alignSize = 0

在文件 los_bootargs.c 第 48 行定义.

g_bootArgs

STATIC struct BootArgs g_bootArgs[MAX_ARGS_NUM] = {0}

在文件 los_bootargs.c 第 49 行定义.

g_cmdLine

STATIC CHAR* g_cmdLine = NULL

在文件 los_bootargs.c 第 47 行定义.