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ecos代码分析(4)_ecos网络

作者：IT领航者 | 2024-02-05 12:00:27

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ecos网络

下面开始看cyg_start()

< redboot/v3_0/src/main.c>

void cyg_start(void)

:: an no parameters routine

è CYGACC_CALL_IF_MONITOR_VERSION_SET(RedBoot_version)

:: hal_virtual_vector_table[14]= RedBoot_version

:: RedBoot_version是一个表示redboot版本信息的字符数组

è CYGACC_CALL_IF_MONITOR_RETURN_SET(return_to_redboot)

:: hal_virtual_vector_table[21]= return_to_redboot

:: return_to_redboot大概是用来进程切换的，不确定，以后有调用到再分析，这里只是设置

è diag_init_putc(_mon_write_char)

:: _putc = _mon_write_char

è hal_if_diag_init()

:: 只会被调用一次

è CYGACC_CALL_IF_SET_CONSOLE_COMM()

:: hal_virtual_vector_table[13]= set_console_comm()

:: CYGNUM_CALL_IF_SET_COMM_ID_MANGLER = -3

è set_console_comm(-3)

è CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[0])

:: comm_channels是个二维数组，smdk2410来说comm_channels[3][8]

:: 设置hal_virtual_vector_table [5]=comm_channels[0]

è CYGACC_CALL_IF_SET_CONSOLE_COMM(-1)

è set_console_comm(-1)

:: 获取当前comm号，注意这里的static int __selected_id是个静态的，所以返回0

è CYGACC_CALL_IF_SET_CONSOLE_COMM\

(CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL)

:: CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL = 0

è set_console_comm(0)

:: __selected_id = 1

:: 设置hal_virtual_vector_table [5]=comm_channels[1]

:: ram_start = 0x0

:: ram_end = 0x4000000即64M

:: workspace_start = 0x0

:: workspace_end = 0x4000000

:: workspace_end_init = workspace_end = 0x4000000

:: entry_address = 0xffffffff for Nothing has ever been loaded into memory

è bist()

:: build in self test, it is null

:: 运行__RedBoot_INIT_TAB__到__RedBoot_INIT_TAB_END__之间的所有函数

< redboot/v3_0/src/main.c>

320 for (init_entry = __RedBoot_INIT_TAB__; init_entry != &__RedBoot_INIT_TAB_END__; init_entry++) {

321 (*init_entry->fun)();

322 }

详细说明一下

CYG_HAL_TABLE_BEGIN( __RedBoot_INIT_TAB__, RedBoot_inits );

CYG_HAL_TABLE_END( __RedBoot_INIT_TAB_END__, RedBoot_inits );

65 #define __string(_x) #_x

66 #define __xstring(_x) __string(_x)

69 #define CYG_HAL_TABLE_BEGIN( _label, _name )

70 __asm__(".section \".ecos.table." __xstring(_name) ".begin\",\"aw\"\n" \

71 ".globl " __xstring(CYG_LABEL_DEFN(_label)) "\n" \

72 ".type " __xstring(CYG_LABEL_DEFN(_label)) ",object\n" \

73 ".p2align"__xstring(CYGARC_P2ALIGNMENT)"\n" \

74 __xstring(CYG_LABEL_DEFN(_label))":\n" \

75 ".previous\n" \

76 )

80 #define CYG_HAL_TABLE_END( _label, _name ) \

81 __asm__(".section \".ecos.table." __xstring(_name) ".finish\",\"aw\"\n" \

82 ".globl " __xstring(CYG_LABEL_DEFN(_label)) "\n" \

83 ".type " __xstring(CYG_LABEL_DEFN(_label)) ",object\n" \

84 ".p2align " __xstring(CYGARC_P2ALIGNMENT) "\n" \

85 __xstring(CYG_LABEL_DEFN(_label)) ":\n" \

86 ".previous\n" \

87 )

#define CYG_LABEL_DEFN(_name_) _name_

扩展后如下：

#define CYG_HAL_TABLE_BEGIN( _label, _name )

.section ".ecos.table.RedBoot_inits.begin","aw"

.globl __RedBoot_INIT_TAB__

.type __RedBoot_INIT_TAB__ ,object

.p2align 5

__RedBoot_INIT_TAB__ :

.previous

.section ".ecos.table.RedBoot_inits.finish","aw"

.globl __RedBoot_INIT_TAB_END__

.type __RedBoot_INIT_TAB_END__ ,object

.p2align 5

__RedBoot_INIT_TAB_END__ :

.previous

又有

typedef void void_fun(void);

typedef void_fun *void_fun_ptr;

struct init_tab_entry {

void_fun_ptr fun;

} CYG_HAL_TABLE_TYPE;

#define _RedBoot_init(_f_,_p_) \

struct init_tab_entry _init_tab_##_p_##_f_ \

CYG_HAL_TABLE_QUALIFIED_ENTRY(RedBoot_inits,_p_##_f_) = { _f_ };

#define RedBoot_init(_f_,_p_) _RedBoot_init(_f_,_p_)

#define CYG_HAL_TABLE_QUALIFIED_ENTRY( _name, _qual ) \

CYGBLD_ATTRIB_SECTION(".ecos.table." __xstring(_name) ".data." \

__xstring(_qual)) \

CYGBLD_ATTRIB_USED

# define CYGBLD_ATTRIB_SECTION(__sect__) __attribute__((section (__sect__)))

说明运行RedBoot_init(_f_,_p_)时会把代码放到segment

.ecos.table. RedBoot_inits.data. _p_##_f_ 里面

查找RedBoot_init，结果如下：

Decompress.c (redboot\v3_0\src):RedBoot_init(_zlib_init, RedBoot_INIT_FIRST);

Fconfig.c (redboot\v3_0\src):RedBoot_init(load_flash_config, RedBoot_INIT_SECOND);

Flash.c (redboot\v3_0\src):RedBoot_init(_do_flash_init, RedBoot_INIT_FIRST);

Flash_load.c (redboot\v3_0\src):RedBoot_init(flash_load_init, RedBoot_INIT_LAST);

Ide.c (redboot\v3_0\src\fs):RedBoot_init(ide_init, RedBoot_INIT_FIRST);

Net_io.c (redboot\v3_0\src\net):RedBoot_init(net_init, RedBoot_INIT_NET);

RedBoot_init(ide_init, RedBoot_INIT_FIRST)就表示ide_init代码存放在segment:

.ecos.table. RedBoot_inits.data. 0000ide_init 里面

:: 这里有初始化ide flash net zlib，这些初始化函数以后再看了

:: mem_segments[0].start = workspace_start;

:: mem_segments[0].end = workspace_end;

è cyg_plf_redboot_startup()

:: Run a platform specific startup function

è do_version(0,0)

:: redboot正式启动，打印一大堆东西，有版本内存信息 flash信息等等

è diag_printf()

è _vprintf()

:: 一大堆字符的格式化处理，然后调用_putc输出

:: _putc = _mon_write_char这是前面赋值的，现在运行了，所以要看看了

è static void _mon_write_char(char c, void **param)

è void mon_write_char(unsigned char c)

è CYGACC_CALL_IF_SET_CONSOLE_COMM(-1)

:: 查询当前用到的com赋值给cur

:: CYGACC_CALL_IF_SET_CONSOLE_COMM(i)，设com_i为console

:: __chan = CYGACC_CALL_IF_CONSOLE_PROCS()获取要输出的channel

:: CYGACC_COMM_IF_PUTC(*__chan, c) 输出字符

è cyg_hal_plf_serial_putc() 串口初始化时指定hal_diag.c中

:: 只要串口的FIFO没有满，就往里面写，串口输出

è CYGACC_CALL_IF_SET_CONSOLE_COMM(cur)设回cur_com

è int _rb_gets(char *buf, int buflen, int timeout)

:: 从输入获取指令（字符串）

è int _rb_gets_preloaded(char *buf, int buflen, int timeout)

è mon_set_read_char_timeout()

:: 设置读取字符的timeout

è cyg_hal_plf_serial_control()

:: 设置chan->msec_timeout

è mon_read_char_with_timeout()

è CYGACC_COMM_IF_GETC_TIMEOUT()

è cyg_hal_plf_serial_getc_timeout()

è cyg_hal_plf_serial_getc_nonblock()

:: 直接读取字符，非阻塞

è CYGACC_CALL_IF_DELAY_US(100)

è delay_us()

:: 从寄存器TCNTO4直接读取时间量

è mon_read_char()

:: 获取输入字符串，无时限

:: 将得到的字符组合起来到buf中，返回

è struct cmd *cmd_search(struct cmd *tab, struct cmd *tabend, char *arg)

:: 从__RedBoot_CMD_TAB__到__RedBoot_CMD_TAB_END__搜索

:: 同前面的初始化segment一样，不多说了

:: 用函数RedBoot_cmd实现对命令的声明

此后就开始执行所输入命令

原文见：http://blog.sina.com.cn/s/blog_559f6ffc0100mkbi.html

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