{"id":335,"date":"2018-03-14T09:34:40","date_gmt":"2018-03-14T01:34:40","guid":{"rendered":"http:\/\/www.max-shu.com\/blog\/?p=335"},"modified":"2018-03-14T09:34:40","modified_gmt":"2018-03-14T01:34:40","slug":"linux%e7%9a%84boot-compressed-misc-c","status":"publish","type":"post","link":"http:\/\/www.max-shu.com\/blog\/?p=335","title":{"rendered":"linux\u7684boot\/compressed\/misc.c"},"content":{"rendered":"
\u4e3b\u8981\u5b8c\u6210\u89e3\u538b\u7f29\u7684\u529f\u80fd\u3002<\/div>\n
<\/div>\n
int fill_inbuf(void)
\n{
\nif (insize != 0)
\nerror(“ran out of input data”);<\/p>\n

inbuf = input_data; \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/*\u6ce8\u610f\u8fd9\u91cc\u7684input_data\u548cinput_data_end\u5c31\u662f\u5728piggy.S\u91cc\u9762\u5b9a\u4e49\u7684\u3002\u6240\u6709\u89e3\u538b\u7f29\u51fd\u6570\u4e0d\u9700\u8981zimage\u6620\u8c61\u7684\u8d77\u59cb\u5730\u5740\u548c\u957f\u5ea6\u3002*\/
\ninsize = &input_data_end[0] – &input_data[0];<\/p>\n

inptr = 1;
\nreturn inbuf[0];
\n}<\/p>\n

\/* ===========================================================================
\n* Write the output window window[0..outcnt-1] and update crc and bytes_out.
\n* (Used for the decompressed data only.)
\n*\/
\nvoid flush_window(void)
\n{
\nulg c = crc;
\nunsigned n;
\nuch *in, *out, ch;<\/p>\n

in = window;
\nout = &output_data[output_ptr];
\nfor (n = 0; n < outcnt; n++) {
\nch = *out++ = *in++;
\nc = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
\n}
\ncrc = c;
\nbytes_out += (ulg)outcnt;
\noutput_ptr += (ulg)outcnt;
\noutcnt = 0;
\nputstr(“.”);
\n}<\/p>\n

#ifndef arch_error
\n#define arch_error(x)
\n#endif<\/p>\n

static void error(char *x)
\n{
\narch_error(x);<\/p>\n

putstr(“\\n\\n”);
\nputstr(x);
\nputstr(“\\n\\n — System halted”);<\/p>\n

while(1);\u00a0\u00a0\u00a0\u00a0 \/* Halt *\/
\n}<\/p>\n

#ifndef STANDALONE_DEBUG<\/p>\n

ulg
\ndecompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
\nint arch_id) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/*\u6709head.S\u8c03\u7528\u7684\u89e3\u538b\u7f29\u51fd\u6570\uff0c\u5c31\u662f\u89e3\u538b\u7f29gzip\u7684\u65b9\u5f0f\u3002*\/
\n{
\noutput_data\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = (uch *)output_start;\u00a0\u00a0\u00a0\u00a0 \/* Points to kernel start *\/
\nfree_mem_ptr\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = free_mem_ptr_p;
\nfree_mem_end_ptr\u00a0\u00a0\u00a0\u00a0 = free_mem_ptr_end_p;
\n__machine_arch_type\u00a0\u00a0\u00a0\u00a0 = arch_id;<\/p>\n

arch_decomp_setup();<\/p>\n

makecrc();
\nputstr(“Uncompressing Linux…”);
\ngunzip();
\nputstr(” done, booting the kernel.\\n”);
\nreturn output_ptr;
\n}<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

\u4e3b\u8981\u5b8c\u6210\u89e3\u538b\u7f29\u7684\u529f\u80fd\u3002 int fill_inbuf(void) { if (insize != 0) err …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[9,261,243,244],"class_list":["post-335","post","type-post","status-publish","format-standard","hentry","category-linuxandroid","tag-linux","tag-misc-c","tag-243","tag-244"],"views":1663,"_links":{"self":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/335","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=335"}],"version-history":[{"count":1,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/335\/revisions"}],"predecessor-version":[{"id":336,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/335\/revisions\/336"}],"wp:attachment":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=335"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}