Imported a bunch of C code from KarlOS + bootboot
This commit is contained in:
parent
94919ad0c7
commit
fcdea29944
4 changed files with 489 additions and 5 deletions
2
Makefile
2
Makefile
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@ -19,5 +19,5 @@ boot.elf: lboot.o loader.o fernlader.ld
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lboot.o: lboot.S
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$(CC) $(CFLAGS) -c -o $@ $(@:.o=.S)
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loader.o: loader.c
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loader.o: loader.c bootboot.h fs.h
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$(CC) $(CFLAGS) -m64 -Os -c -o $@ $(@:.o=.c)
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358
fs.h
Normal file
358
fs.h
Normal file
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@ -0,0 +1,358 @@
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/*
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* x86_64-cb/fs.h
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*
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* Copyright (C) 2017 - 2021 bzt (bztsrc@gitlab)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* This file is part of the BOOTBOOT Protocol package.
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* @brief Filesystem drivers for initial ramdisk.
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*
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*/
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#define DBG(...) do {} while (0)
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#if 0
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/**
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* FS/Z initrd (OS/Z's native file system)
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*/
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file_t fsz_initrd(unsigned char *initrd_p, char *kernel)
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{
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file_t ret = { NULL, 0 };
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if(initrd_p==NULL || memcmp(initrd_p + 512,"FS/Z",4) || kernel==NULL){
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return ret;
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}
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unsigned char passphrase[256],chk[32],iv[32];
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unsigned int i,j,k,l,ss=1<<(initrd_p[518]+11);
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unsigned char *ent, *in=(initrd_p+*((uint64_t*)(initrd_p+560))*ss);
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SHA256_CTX ctx;
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DBG(" * FS/Z %s\n",kernel);
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//decrypt initrd
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if(*((uint32_t*)(initrd_p+520))!=0 && (initrd_p[519]&&0xF0)!=0) {
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printf("BOOTBOOT-PANIC: Unsupported cipher\n");
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return ret;
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}
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while(*((uint32_t*)(initrd_p+520))!=0) {
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printf(" * Passphrase? ");
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l=ReadLine(passphrase,sizeof(passphrase));
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if(!l) {
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printf("\n");
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return ret;
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}
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if(*((uint32_t*)(initrd_p+520))!=crc32_calc((char*)passphrase,l)) {
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printf("\rBOOTBOOT-ERROR: Bad passphrase\n");
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continue;
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}
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printf("\r * Decrypting...\r");
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SHA256_Init(&ctx);
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SHA256_Update(&ctx,passphrase,l);
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SHA256_Update(&ctx,initrd_p+512,6);
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SHA256_Final(chk,&ctx);
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for(i=0;i<32;i++) initrd_p[i+680]^=chk[i];
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SHA256_Init(&ctx);
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SHA256_Update(&ctx,initrd_p+680,32);
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SHA256_Final(iv,&ctx);
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// FSZ_SB_EALG_SHACBC
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for(k=ss,j=1;j<*((uint32_t*)(initrd_p+528));j++) {
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memcpy(chk,iv,32);
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for(i=0;i<ss;i++) {
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if(i%32==0) {
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SHA256_Init(&ctx);
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SHA256_Update(&ctx,&chk,32);
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SHA256_Update(&ctx,&j,4);
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SHA256_Final(chk,&ctx);
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}
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initrd_p[k++]^=chk[i%32]^iv[i%32];
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}
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}
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memset(initrd_p+680,0,32); *((uint32_t*)(initrd_p+520)) = 0;
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*((uint32_t*)(initrd_p+1020))=crc32_calc((char *)initrd_p+512,508);
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printf(" \r");
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}
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// Get the inode
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char *s,*e;
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s=e=kernel;
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i=0;
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again:
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while(*e!='/'&&*e!=0){e++;}
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if(*e=='/'){e++;}
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if(!memcmp(in,"FSIN",4)){
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//is it inlined?
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if(!memcmp(initrd_p[520]&1? in + 2048 : in + 1024,"FSDR",4)){
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ent=(initrd_p[520]&1? in + 2048 : in + 1024);
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} else if(!memcmp(initrd_p+*((uint64_t*)(in+448))*ss,"FSDR",4)){
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// go, get the sector pointed
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ent=(initrd_p+*((uint64_t*)(in+448))*ss);
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} else {
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return ret;
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}
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//skip header
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unsigned char *hdr=ent; ent+=128;
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//iterate on directory entries
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int j=*((uint64_t*)(hdr+16));
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while(j-->0){
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if(!memcmp(ent + 16,s,e-s)) {
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if(*e==0) {
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i=*((uint64_t*)(ent+0));
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break;
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} else {
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s=e;
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in=(initrd_p+*((uint64_t*)(ent+0))*ss);
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goto again;
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}
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}
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ent+=128;
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}
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} else {
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i=0;
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}
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if(i!=0) {
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// fid -> inode ptr -> data ptr
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unsigned char *in=(initrd_p+i*ss);
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if(!memcmp(in,"FSIN",4)){
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ret.size=*((uint64_t*)(in+464));
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if(*((uint64_t*)(in+448)) == i) {
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if(!(in[488]&31)) {
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// inline data
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ret.ptr=(uint8_t*)(initrd_p+i*ss+(initrd_p[520]&1? 2048 : 1024));
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} else {
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// sector directory or list inlined
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ret.ptr=(uint8_t*)(initrd_p + *((uint64_t*)(initrd_p[520]&1? in + 2048 : in + 1024))*ss);
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}
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} else
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if(*((uint64_t*)(in+448))) {
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switch((in[488]&15) + (in[488]&16 ? 1 : 0)) {
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case 0: // direct data
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ret.ptr=(uint8_t*)(initrd_p + *((uint64_t*)(in+448)) * ss);
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break;
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case 1: // sector directory or list (only one level supported here, and no holes in files)
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ret.ptr=(uint8_t*)(initrd_p + *((uint64_t*)(initrd_p + *((uint64_t*)(in+448))*ss)) * ss);
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break;
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}
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} else ret.size=0;
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}
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}
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return ret;
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}
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#endif
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/**
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* Minix3 file system
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* directories only checked for their first block, and kernel must be defragmented
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*/
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file_t mfs_initrd(unsigned char *initrd_p, char *kernel)
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{
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uint32_t o, bs, ino_tbl;
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uint8_t *ino, *d;
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char *s = kernel, *e;
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file_t ret = { NULL, 0 };
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if(initrd_p[1048] != 'Z' || initrd_p[1049] != 'M') return ret;
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DBG(" * MFS %s\n",kernel);
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bs = *((uint16_t*)(initrd_p + 1052));
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ino_tbl = (2 + *((uint16_t*)(initrd_p + 1030)) + *((uint16_t*)(initrd_p + 1032))) * bs;
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ino = initrd_p + ino_tbl;
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again:
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for(e = s; *e && *e != '/'; e++);
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d = initrd_p + *((uint32_t*)(ino + 24)) * bs;
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for(o = 0; o < *((uint32_t*)(ino + 8)) && o < bs; o += 64, d += 64) {
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if(*((uint32_t*)d) && !memcmp(s, d + 4, e - s) && !d[e - s]) {
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ino = initrd_p + ino_tbl + (*((uint32_t*)d) - 1) * 64;
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d = initrd_p + *((uint32_t*)(ino + 24)) * bs;
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if(!*e) { ret.ptr = d; ret.size = *((uint32_t*)(ino + 8)); return ret; }
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s = e + 1; goto again;
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}
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}
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return ret;
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}
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/**
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* cpio archive
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*/
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file_t cpio_initrd(unsigned char *initrd_p, char *kernel)
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{
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unsigned char *ptr=initrd_p;
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int k;
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file_t ret = { NULL, 0 };
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if(initrd_p==NULL || kernel==NULL ||
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(memcmp(initrd_p,"070701",6) && memcmp(initrd_p,"070702",6) && memcmp(initrd_p,"070707",6)))
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return ret;
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DBG(" * cpio %s\n",kernel);
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k=strlen(kernel);
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// hpodc archive
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while(!memcmp(ptr,"070707",6)){
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int ns=octbin(ptr+8*6+11,6);
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int fs=octbin(ptr+8*6+11+6,11);
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if(!memcmp(ptr+9*6+2*11,kernel,k+1) ||
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(ptr[9*6+2*11] == '.' && ptr[9*6+2*11+1] == '/' && !memcmp(ptr+9*6+2*11+2,kernel,k+1))) {
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ret.size=fs;
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ret.ptr=(uint8_t*)(ptr+9*6+2*11+ns);
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return ret;
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}
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ptr+=(76+ns+fs);
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}
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// newc and crc archive
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while(!memcmp(ptr,"07070",5)){
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int fs=hexbin(ptr+8*6+6,8);
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int ns=hexbin(ptr+8*11+6,8);
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if(!memcmp(ptr+110,kernel,k+1) || (ptr[110] == '.' && ptr[111] == '/' && !memcmp(ptr+112,kernel,k+1))) {
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ret.size=fs;
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ret.ptr=(uint8_t*)(ptr+((110+ns+3)/4)*4);
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return ret;
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}
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ptr+=((110+ns+3)/4)*4 + ((fs+3)/4)*4;
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}
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return ret;
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}
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/**
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* ustar tarball archive
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*/
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file_t tar_initrd(unsigned char *initrd_p, char *kernel)
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{
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unsigned char *ptr=initrd_p;
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int k;
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file_t ret = { NULL, 0 };
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if(initrd_p==NULL || kernel==NULL || memcmp(initrd_p+257,"ustar",5))
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return ret;
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DBG(" * tar %s\n",kernel);
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k=strlen(kernel);
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while(!memcmp(ptr+257,"ustar",5)){
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int fs=octbin(ptr+0x7c,11);
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if(!memcmp(ptr,kernel,k+1) || (ptr[0] == '.' && ptr[1] == '/' && !memcmp(ptr+2,kernel,k+1))) {
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ret.size=fs;
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ret.ptr=(uint8_t*)(ptr+512);
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return ret;
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}
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ptr+=(((fs+511)/512)+1)*512;
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}
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return ret;
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}
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/**
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* Simple File System
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*/
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file_t sfs_initrd(unsigned char *initrd_p, char *kernel)
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{
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unsigned char *ptr, *end;
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int k,bs,ver;
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file_t ret = { NULL, 0 };
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if(initrd_p==NULL || kernel==NULL || (memcmp(initrd_p+0x1AC,"SFS",3) && memcmp(initrd_p+0x1A6,"SFS",3)))
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return ret;
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// 1.0 Brendan's version, 1.10 BenLunt's version
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ver=!memcmp(initrd_p+0x1A6,"SFS",3)?10:0;
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bs=1<<(7+(uint8_t)initrd_p[ver?0x1B6:0x1BC]);
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end=initrd_p + *((uint64_t *)&initrd_p[ver?0x1AA:0x1B0]) * bs; // base + total_number_of_blocks * blocksize
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// get index area
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ptr=end - *((uint64_t *)&initrd_p[ver?0x19E:0x1A4]); // end - size of index area
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// got a Starting Marker Entry?
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if(ptr[0]!=2)
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return ret;
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DBG(" * SFS 1.%s %s\n", ver?"10":"0",kernel);
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k=strlen(kernel);
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// iterate on index until we reach the end or Volume Identifier
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while(ptr<end && ptr[0]!=0x01){
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ptr+=64;
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// file entry?
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if(ptr[0]!=0x12)
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continue;
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// filename match?
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if(!memcmp(ptr+(ver?0x23:0x22),kernel,k+1)){
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ret.size=*((uint64_t*)&ptr[ver?0x1B:0x1A]); // file_length
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ret.ptr=initrd_p + *((uint64_t*)&ptr[ver?0x0B:0x0A]) * bs; // base + start_block * blocksize
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break;
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}
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}
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return ret;
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}
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/**
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* James Molloy's initrd (for some reason it's popular among hobby OS developers)
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* http://www.jamesmolloy.co.uk/tutorial_html
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*/
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file_t jamesm_initrd(unsigned char *initrd_p, char *kernel)
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{
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unsigned char *ptr=initrd_p+4;
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int i,k,nf=*((int*)initrd_p);
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file_t ret = { NULL, 0 };
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// no real magic, so we assume initrd contains at least one file...
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if(initrd_p==NULL || kernel==NULL || initrd_p[2]!=0 || initrd_p[3]!=0 || initrd_p[4]!=0xBF)
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return ret;
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DBG(" * JamesM %s\n",kernel);
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k=strlen(kernel);
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for(i=0;i<nf && ptr[0]==0xBF;i++) {
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if(!memcmp(ptr+1,kernel,k+1)){
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ret.ptr=*((uint32_t*)(ptr+65)) + initrd_p;
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ret.size=*((uint32_t*)(ptr+69));
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}
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ptr+=73;
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}
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return ret;
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}
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/**
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* EchFS
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* http://github.com/echfs/echfs
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*/
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file_t ech_initrd(unsigned char *initrd_p, char *kernel)
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{
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uint64_t parent = 0xffffffffffffffffUL, n;
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unsigned char *ptr;
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char *end, *fn;
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int k = 0;
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file_t ret = { NULL, 0 };
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if(initrd_p==NULL || kernel==NULL || memcmp(initrd_p+4,"_ECH_FS_",8))
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return ret;
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DBG(" * EchFS %s\n",kernel);
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memcpy(&k, initrd_p + 28, 4);
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memcpy(&n, initrd_p + 12, 8);
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ptr = initrd_p + (((n * 8 + k - 1) / k) + 16) * k;
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for(end = fn = kernel; *end && *end != '/'; end++);
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while(*((uint64_t*)ptr)) {
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if(*((uint64_t*)ptr) == parent && !memcmp(ptr + 9, fn, end - fn) && !ptr[9 + end - fn]) {
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parent = *((uint64_t*)(ptr + 240));
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if(!*end) {
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ret.size=*((uint64_t*)(ptr + 248));
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ret.ptr=(uint8_t*)(initrd_p + parent * k);
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break;
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}
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end++;
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for(fn = end; *end && *end != '/'; end++);
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}
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ptr += 256;
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}
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return ret;
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}
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/**
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* Static file system drivers registry
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*/
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file_t (*fsdrivers[]) (unsigned char *, char *) = {
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//fsz_initrd,
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mfs_initrd,
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cpio_initrd,
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tar_initrd,
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sfs_initrd,
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jamesm_initrd,
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ech_initrd,
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NULL
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};
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#undef DBG
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11
lboot.S
11
lboot.S
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@ -1,9 +1,12 @@
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// vim: et:sw=12:ts=12:sts=12
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// lboot.S: boot code for legacy BIOS boot over PXE.
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.global _start
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.text
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.code16
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.set PACKET_SIZE, 1024
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.macro pxe_call, opcode
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mov %sp, %bx
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push %ss
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@ -66,7 +69,7 @@ _start: cli
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push $0
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push %cs
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push $tx_buf
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push $1024
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push $PACKET_SIZE
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push $2
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push $0
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pxe_call PXE_GET_CACHED_INFO
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@ -254,8 +257,8 @@ _aerr: mov $msg_aerr, %si
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read_file:
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.set PXE_TFTP_OPEN, 0x0020
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push $1024
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push $0x4500
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push $PACKET_SIZE
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push $69<<8
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sub $128, %sp
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mov $fn_config, %esi
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@ -424,7 +427,7 @@ pml4_ptr: .long 0
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// Points to the end of the memory map
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memmap_end: .word 0
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tx_buf: .space 1024
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tx_buf: .space PACKET_SIZE
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.code64
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// trampo64: Trampoline function to load long-mode segments
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123
loader.c
123
loader.c
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@ -1,3 +1,126 @@
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#include <stdint.h>
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#include <stddef.h>
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// minimal set of string routines, copied from KarlOS
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void *memset(void *ptr, int value, size_t num)
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{
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__asm__ ("rep stosb"
|
||||
: "+D"(ptr), "+c"(num)
|
||||
: "a"(value)
|
||||
: "memory");
|
||||
return ptr;
|
||||
}
|
||||
|
||||
void *memcpy(void *restrict dest, const void *restrict src, size_t num)
|
||||
{
|
||||
__asm__ ("rep movsb"
|
||||
: "+D"(dest), "+S"(src), "+c"(num)
|
||||
:
|
||||
: "memory");
|
||||
return dest;
|
||||
}
|
||||
|
||||
int memcmp(const void *ptr, const void *ptr2, size_t num)
|
||||
{
|
||||
unsigned char *d = (unsigned char *)ptr;
|
||||
unsigned char *b = (unsigned char *)ptr2;
|
||||
for (size_t i = 0; i < num; i++) {
|
||||
if (d[i] != b[i]) {
|
||||
return (d[i] - b[i]);
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
size_t strlen(const char *s)
|
||||
{
|
||||
size_t len = 0;
|
||||
while (*s != '\0') {
|
||||
s++;
|
||||
len++;
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
// Helpers from bztsrc's bootboot codebase
|
||||
|
||||
/**
|
||||
* convert ascii octal number to binary number
|
||||
*/
|
||||
int octbin(unsigned char *str,int size)
|
||||
{
|
||||
int s=0;
|
||||
unsigned char *c=str;
|
||||
while(size-->0){
|
||||
s*=8;
|
||||
s+=*c-'0';
|
||||
c++;
|
||||
}
|
||||
return s;
|
||||
}
|
||||
|
||||
/**
|
||||
* convert ascii hex number to binary number
|
||||
*/
|
||||
int hexbin(unsigned char *str, int size)
|
||||
{
|
||||
int v=0;
|
||||
while(size-->0){
|
||||
v <<= 4;
|
||||
if(*str>='0' && *str<='9')
|
||||
v += (int)((unsigned char)(*str)-'0');
|
||||
else if(*str >= 'A' && *str <= 'F')
|
||||
v += (int)((unsigned char)(*str)-'A'+10);
|
||||
str++;
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
uint8_t *ptr;
|
||||
uint64_t size;
|
||||
} file_t;
|
||||
|
||||
#include "bootboot.h"
|
||||
#include "fs.h"
|
||||
|
||||
// ELF64
|
||||
|
||||
#define EI_NIDENT 16
|
||||
#define EI_MAG0 0x7F
|
||||
#define EI_MAG1 'E'
|
||||
#define EI_MAG2 'L'
|
||||
#define EI_MAG3 'F'
|
||||
|
||||
typedef struct {
|
||||
unsigned char e_ident[EI_NIDENT];
|
||||
uint16_t e_type;
|
||||
uint16_t e_machine;
|
||||
uint32_t e_version;
|
||||
uint64_t e_entry;
|
||||
uint64_t e_phoff;
|
||||
uint64_t e_shoff;
|
||||
uint32_t e_flags;
|
||||
uint16_t e_ehsize;
|
||||
uint16_t e_phentsize;
|
||||
uint16_t e_phnum;
|
||||
uint16_t e_shentsize;
|
||||
uint16_t e_shnum;
|
||||
uint16_t e_shstrndx;
|
||||
} Elf64_Ehdr;
|
||||
|
||||
typedef struct {
|
||||
uint32_t p_type;
|
||||
uint32_t p_flags;
|
||||
uint64_t p_offset;
|
||||
uint64_t p_vaddr;
|
||||
uint64_t p_paddr;
|
||||
uint64_t p_filesz;
|
||||
uint64_t p_memsz;
|
||||
uint64_t p_align;
|
||||
} Elf64_Phdr;
|
||||
|
||||
void
|
||||
loader_main(void)
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue