{"id":294,"date":"2018-03-13T13:41:02","date_gmt":"2018-03-13T05:41:02","guid":{"rendered":"http:\/\/www.max-shu.com\/blog\/?p=294"},"modified":"2018-03-13T13:41:02","modified_gmt":"2018-03-13T05:41:02","slug":"mini6410%e6%9d%bfuboot%e7%9a%84main-c","status":"publish","type":"post","link":"http:\/\/www.max-shu.com\/blog\/?p=294","title":{"rendered":"mini6410\u677fuboot\u7684Main.c"},"content":{"rendered":"
\u5176\u4e2d\u7684main_loop\u51fd\u6570\u5982\u4e0b\uff1a<\/div>\n
void main_loop (void)
\n{
\n#ifndef CFG_HUSH_PARSER
\nstatic char lastcommand[CFG_CBSIZE] = { 0, };
\nint len;
\nint rc = 1;
\nint flag;
\n#endif<\/p>\n

#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
\nchar *s;
\nint bootdelay;
\n#endif
\n#ifdef CONFIG_PREBOOT
\nchar *p;
\n#endif
\n#ifdef CONFIG_BOOTCOUNT_LIMIT
\nunsigned long bootcount = 0;
\nunsigned long bootlimit = 0;
\nchar *bcs;
\nchar bcs_set[16];
\n#endif \/* CONFIG_BOOTCOUNT_LIMIT *\/<\/p>\n

#if defined(CONFIG_VFD) && defined(VFD_TEST_LOGO)
\nulong bmp = 0;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/* default bitmap *\/
\nextern int trab_vfd (ulong bitmap);<\/p>\n

#ifdef CONFIG_MODEM_SUPPORT
\nif (do_mdm_init)
\nbmp = 1;\u00a0\u00a0\u00a0\u00a0 \/* alternate bitmap *\/
\n#endif
\ntrab_vfd (bmp);
\n#endif\u00a0\u00a0\u00a0\u00a0 \/* CONFIG_VFD && VFD_TEST_LOGO *\/<\/p>\n

#ifdef CONFIG_BOOTCOUNT_LIMIT
\nbootcount = bootcount_load();
\nbootcount++;
\nbootcount_store (bootcount);
\nsprintf (bcs_set, “%lu”, bootcount);
\nsetenv (“bootcount”, bcs_set);
\nbcs = getenv (“bootlimit”);
\nbootlimit = bcs ? simple_strtoul (bcs, NULL, 10) : 0;
\n#endif \/* CONFIG_BOOTCOUNT_LIMIT *\/<\/p>\n

#ifdef CONFIG_MODEM_SUPPORT
\ndebug (“DEBUG: main_loop:\u00a0\u00a0 do_mdm_init=%d\\n”, do_mdm_init);
\nif (do_mdm_init) {
\nchar *str = strdup(getenv(“mdm_cmd”));
\nsetenv (“preboot”, str);\u00a0 \/* set or delete definition *\/
\nif (str != NULL)
\nfree (str);
\nmdm_init(); \/* wait for modem connection *\/
\n}
\n#endif\u00a0 \/* CONFIG_MODEM_SUPPORT *\/<\/p>\n

#ifdef CONFIG_VERSION_VARIABLE
\n{
\nextern char version_string[];<\/p>\n

setenv (“ver”, version_string);\u00a0 \/* set version variable *\/
\n}
\n#endif \/* CONFIG_VERSION_VARIABLE *\/<\/p>\n

#ifdef CFG_HUSH_PARSER
\nu_boot_hush_start ();
\n#endif<\/p>\n

#ifdef CONFIG_AUTO_COMPLETE
\ninstall_auto_complete();
\n#endif<\/p>\n

#ifdef CONFIG_PREBOOT
\nif ((p = getenv (“preboot”)) != NULL) {
\n# ifdef CONFIG_AUTOBOOT_KEYED
\nint prev = disable_ctrlc(1);\u00a0\u00a0\u00a0\u00a0 \/* disable Control C checking *\/
\n# endif<\/p>\n

# ifndef CFG_HUSH_PARSER
\nrun_command (p, 0);
\n# else
\nparse_string_outer(p, FLAG_PARSE_SEMICOLON |
\nFLAG_EXIT_FROM_LOOP);
\n# endif<\/p>\n

# ifdef CONFIG_AUTOBOOT_KEYED
\ndisable_ctrlc(prev);\u00a0\u00a0\u00a0\u00a0 \/* restore Control C checking *\/
\n# endif
\n}
\n#endif \/* CONFIG_PREBOOT *\/<\/p>\n

#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
\ns = getenv (“bootdelay”);
\nbootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;<\/p>\n

debug (“### main_loop entered: bootdelay=%d\\n\\n”, bootdelay);<\/p>\n

# ifdef CONFIG_BOOT_RETRY_TIME
\ninit_cmd_timeout ();
\n# endif\u00a0\u00a0\u00a0\u00a0 \/* CONFIG_BOOT_RETRY_TIME *\/<\/p>\n

#ifdef CONFIG_BOOTCOUNT_LIMIT
\nif (bootlimit && (bootcount > bootlimit)) {
\nprintf (“Warning: Bootlimit (%u) exceeded. Using altbootcmd.\\n”,
\n(unsigned)bootlimit);
\ns = getenv (“altbootcmd”);
\n}
\nelse
\n#endif \/* CONFIG_BOOTCOUNT_LIMIT *\/
\ns = getenv (“bootcmd”);<\/p>\n

debug (“### main_loop: bootcmd=\\”%s\\”\\n”, s ? s : “<UNDEFINED>”);<\/p>\n

if (bootdelay >= 0 && s && !abortboot (bootdelay)) {
\n# ifdef CONFIG_AUTOBOOT_KEYED
\nint prev = disable_ctrlc(1);\u00a0\u00a0\u00a0\u00a0 \/* disable Control C checking *\/
\n# endif<\/p>\n

# ifndef CFG_HUSH_PARSER
\nrun_command (s, 0);
\n# else
\nparse_string_outer(s, FLAG_PARSE_SEMICOLON |
\nFLAG_EXIT_FROM_LOOP);
\n# endif<\/p>\n

# ifdef CONFIG_AUTOBOOT_KEYED
\ndisable_ctrlc(prev);\u00a0\u00a0\u00a0\u00a0 \/* restore Control C checking *\/
\n# endif
\n}<\/p>\n

# ifdef CONFIG_MENUKEY
\nif (menukey == CONFIG_MENUKEY) {
\ns = getenv(“menucmd”);
\nif (s) {
\n# ifndef CFG_HUSH_PARSER
\nrun_command (s, 0);
\n# else
\nparse_string_outer(s, FLAG_PARSE_SEMICOLON |
\nFLAG_EXIT_FROM_LOOP);
\n# endif
\n}
\n}
\n#endif \/* CONFIG_MENUKEY *\/
\n#endif\u00a0\u00a0\u00a0\u00a0 \/* CONFIG_BOOTDELAY *\/<\/p>\n

#ifdef CONFIG_AMIGAONEG3SE
\n{
\nextern void video_banner(void);
\nvideo_banner();
\n}
\n#endif<\/p>\n

FriendlyARMMenu();
\n\/*
\n* Main Loop for Monitor Command Processing
\n*\/
\n#ifdef CFG_HUSH_PARSER
\nparse_file_outer();
\n\/* This point is never reached *\/
\nfor (;;);
\n#else
\nfor (;;) {
\n#ifdef CONFIG_BOOT_RETRY_TIME
\nif (rc >= 0) {
\n\/* Saw enough of a valid command to
\n* restart the timeout.
\n*\/
\nreset_cmd_timeout();
\n}
\n#endif
\nlen = readline (CFG_PROMPT);<\/p>\n

flag = 0;\u00a0\u00a0\u00a0\u00a0 \/* assume no special flags for now *\/
\nif (len > 0)
\nstrcpy (lastcommand, console_buffer);
\nelse if (len == 0)
\nflag |= CMD_FLAG_REPEAT;
\n#ifdef CONFIG_BOOT_RETRY_TIME
\nelse if (len == -2) {
\n\/* -2 means timed out, retry autoboot
\n*\/
\nputs (“\\nTimed out waiting for command\\n”);
\n# ifdef CONFIG_RESET_TO_RETRY
\n\/* Reinit board to run initialization code again *\/
\ndo_reset (NULL, 0, 0, NULL);
\n# else
\nreturn;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/* retry autoboot *\/
\n# endif
\n}
\n#endif<\/p>\n

if (len == -1)
\nputs (“<INTERRUPT>\\n”);
\nelse
\nrc = run_command (lastcommand, flag); \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/*\u4ece\u547d\u4ee4\u884c\u8bfb\u5165\u547d\u4ee4\uff0c\u7136\u540e\u6267\u884c\uff0crun_command\u51fd\u6570\u5b9a\u4e49\u5728\u540c\u4e00\u4e2a\u6587\u4ef6\u7684\u4e0b\u9762\u90e8\u5206*\/<\/p>\n

if (rc <= 0) {
\n\/* invalid command or not repeatable, forget it *\/
\nlastcommand[0] = 0;
\n}
\n}
\n#endif \/*CFG_HUSH_PARSER*\/
\n}<\/p><\/div>\n

<\/div>\n
<\/div>\n
int run_command (const char *cmd, int flag)
\n{
\ncmd_tbl_t *cmdtp;
\nchar cmdbuf[CFG_CBSIZE];\u00a0\u00a0\u00a0\u00a0 \/* working copy of cmd\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *\/
\nchar *token;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/* start of token in cmdbuf\u00a0\u00a0\u00a0\u00a0 *\/
\nchar *sep;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/* end of token (separator) in cmdbuf *\/
\nchar finaltoken[CFG_CBSIZE];
\nchar *str = cmdbuf;
\nchar *argv[CFG_MAXARGS + 1];\u00a0\u00a0\u00a0\u00a0 \/* NULL terminated\u00a0\u00a0\u00a0\u00a0 *\/
\nint argc, inquotes;
\nint repeatable = 1;
\nint rc = 0;<\/p>\n

#ifdef DEBUG_PARSER
\nprintf (“[RUN_COMMAND] cmd[%p]=\\””, cmd);
\nputs (cmd ? cmd : “NULL”);\u00a0\u00a0\u00a0\u00a0 \/* use puts – string may be loooong *\/
\nputs (“\\”\\n”);
\n#endif<\/p>\n

clear_ctrlc();\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/* forget any previous Control C *\/<\/p>\n

if (!cmd || !*cmd) {
\nreturn -1;\u00a0\u00a0\u00a0\u00a0 \/* empty command *\/
\n}<\/p>\n

if (strlen(cmd) >= CFG_CBSIZE) {
\nputs (“## Command too long!\\n”);
\nreturn -1;
\n}<\/p>\n

strcpy (cmdbuf, cmd);<\/p>\n

\/* Process separators and check for invalid
\n* repeatable commands
\n*\/<\/p>\n

#ifdef DEBUG_PARSER
\nprintf (“[PROCESS_SEPARATORS] %s\\n”, cmd);
\n#endif
\nwhile (*str) {<\/p>\n

\/*
\n* Find separator, or string end
\n* Allow simple escape of ‘;’ by writing “\\;”
\n*\/
\nfor (inquotes = 0, sep = str; *sep; sep++) {
\nif ((*sep==’\\”) &&
\n(*(sep-1) != ‘\\\\’))
\ninquotes=!inquotes;<\/p>\n

if (!inquotes &&
\n(*sep == ‘;’) &&\u00a0\u00a0\u00a0\u00a0 \/* separator\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *\/
\n( sep != str) &&\u00a0\u00a0\u00a0\u00a0 \/* past string start\u00a0\u00a0\u00a0\u00a0 *\/
\n(*(sep-1) != ‘\\\\’))\u00a0\u00a0\u00a0\u00a0 \/* and NOT escaped\u00a0\u00a0\u00a0\u00a0 *\/
\nbreak;
\n}<\/p>\n

\/*
\n* Limit the token to data between separators
\n*\/
\ntoken = str;
\nif (*sep) {
\nstr = sep + 1;\u00a0\u00a0\u00a0\u00a0 \/* start of command for next pass *\/
\n*sep = ‘\\0’;
\n}
\nelse
\nstr = sep;\u00a0\u00a0\u00a0\u00a0 \/* no more commands for next pass *\/
\n#ifdef DEBUG_PARSER
\nprintf (“token: \\”%s\\”\\n”, token);
\n#endif<\/p>\n

\/* find macros in this token and replace them *\/
\nprocess_macros (token, finaltoken);<\/p>\n

\/* Extract arguments *\/
\nif ((argc = parse_line (finaltoken, argv)) == 0) {
\nrc = -1;\u00a0\u00a0\u00a0\u00a0 \/* no command at all *\/
\ncontinue;
\n}<\/p>\n

\/* Look up command in command table *\/
\nif ((cmdtp = find_cmd(argv[0])) == NULL) { \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/*\u627e\u5230\u547d\u4ee4\u5bf9\u5e94\u7684\u7ed3\u6784\uff0c\u7ed3\u6784\u5b9a\u4e49\u5728command.h\u91cc\u9762\uff0c\u662f\u4e00\u4e2a\u7ed3\u6784\u6570\u7ec4\uff0c\u6bcf\u4e2a\u547d\u4ee4\u5bf9\u5e94\u4e00\u4e2a\u7ed3\u6784\uff0c\u547d\u4ee4\u5b9a\u4e49\u5728\u5404\u4e2a\u5904\u7406\u6587\u4ef6\u4e2d\uff0c\u8fd9\u4e2a\u7ed3\u6784\u6570\u7ec4\u5355\u72ec\u7528\u4e86\u4e00\u4e2a\u6c47\u7f16\u6bb5\uff1a__u_boot_cmd_start\uff0c\u5b9a\u4e49uboot.lds\u6587\u4ef6\u4e2d\uff0c\u4e3e\u4f8b\uff1aboot linux\u7684\u547d\u4ee4\u5b9a\u4e49\u5728Cmd_bootm.c\u91cc\u9762\u7684U_BOOT_CMD\u8fd9\u91cc\uff0c\u5b83\u7684\u5904\u7406\u51fd\u6570\u662fdo_bootm\u3002*\/
\nprintf (“Unknown command ‘%s’ – try ‘help’\\n”, argv[0]);
\nrc = -1;\u00a0\u00a0\u00a0\u00a0 \/* give up after bad command *\/
\ncontinue;
\n}<\/p>\n

\/* found – check max args *\/
\nif (argc > cmdtp->maxargs) {
\nprintf (“Usage:\\n%s\\n”, cmdtp->usage);
\nrc = -1;
\ncontinue;
\n}<\/p>\n

#if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
\n\/* avoid “bootd” recursion *\/
\nif (cmdtp->cmd == do_bootd) {
\n#ifdef DEBUG_PARSER
\nprintf (“[%s]\\n”, finaltoken);
\n#endif
\nif (flag & CMD_FLAG_BOOTD) {
\nputs (“‘bootd’ recursion detected\\n”);
\nrc = -1;
\ncontinue;
\n} else {
\nflag |= CMD_FLAG_BOOTD;
\n}
\n}
\n#endif\u00a0\u00a0\u00a0\u00a0 \/* CFG_CMD_BOOTD *\/<\/p>\n

\/* OK – call function to do the command *\/
\nif ((cmdtp->cmd) (cmdtp, flag, argc, argv) != 0) { \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/*\u6267\u884c\u547d\u4ee4\uff0c\u6bd4\u5982boot linux\u5c31\u662f\u6267\u884cdo_bootm\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u5b9a\u4e49\u5728Cmd_bootm.c\u91cc\u9762\u3002*\/
\nrc = -1;
\n}<\/p>\n

repeatable &= cmdtp->repeatable;<\/p>\n

\/* Did the user stop this? *\/
\nif (had_ctrlc ())
\nreturn 0;\u00a0\u00a0\u00a0\u00a0 \/* if stopped then not repeatable *\/
\n}<\/p>\n

return rc ? rc : repeatable;
\n}<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

\u5176\u4e2d\u7684main_loop\u51fd\u6570\u5982\u4e0b\uff1a void main_loop (void) { #ifndef CFG_H …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[234,48,49],"class_list":["post-294","post","type-post","status-publish","format-standard","hentry","category-6","tag-main-c","tag-mini6410","tag-uboot"],"views":1433,"_links":{"self":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/294","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=294"}],"version-history":[{"count":1,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/294\/revisions"}],"predecessor-version":[{"id":295,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/294\/revisions\/295"}],"wp:attachment":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=294"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=294"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}