开机logo 旋转

解析从uboot传过来的关于logo分区的一些参数,然后显示开机图标,进行顺时针及方向旋转

文件下载：

CONFIG_LOGO_LINUX_BMP=y

unsigned int xxxx_logo_width __read_mostly;
EXPORT_SYMBOL(xxxx_logo_width);

unsigned int xxxx_logo_height __read_mostly;
EXPORT_SYMBOL(xxxx_logo_height);

unsigned int xxxx_logo_addr __read_mostly;
EXPORT_SYMBOL(xxxx_logo_addr);

static void __init do_parse_xxxx_logo_param(void){
    char * xxxxlogo = "xxxx.logo=";
    char * ret = strstr(boot_command_line,xxxxlogo);
    char str_logo[40] = {0};
    char str_ignore[4] = {0};
    xxxx_logo_width = 0;
    xxxx_logo_height = 0;
    xxxx_logo_addr = 0;
    if(ret != NULL){
        ret = ret + 9;
        snprintf(str_logo,sizeof(str_logo),"%s",ret);
        sscanf(str_logo,"%d,%d@%x%s",&xxxx_logo_width,&xxxx_logo_height,&xxxx_logo_addr,str_ignore);
    }
}

void __init setup_arch(char **cmdline_p)
{
    setup_processor();

    setup_machine_fdt(__fdt_pointer);

    init_mm.start_code = (unsigned long) _text;
    init_mm.end_code   = (unsigned long) _etext;
    init_mm.end_data   = (unsigned long) _edata;
    init_mm.brk       = (unsigned long) _end;

    *cmdline_p = boot_command_line;

    do_parse_xxxx_logo_param();

config LOGO_LINUX_BMP
    bool "Standard Linux BMP logo"
    default y

extern unsigned int xxxx_logo_width ;
extern unsigned int xxxx_logo_height ;
extern unsigned int xxxx_logo_addr ;

static void fb_show_bmp_xxxx_logo_ccw(struct fb_info *info, int lWidth,int lHeight,phys_addr_t addr)
{
    int i,m;
    int x,y;
    int needWidth = lWidth;
    unsigned char *dst=info->screen_base;
    unsigned char *src= (unsigned char*) phys_to_virt(addr);
    实现旋转。
}

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