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Replace fix-rom script with utils binary

This commit is contained in:
Nero 2019-11-09 11:02:27 +00:00
parent a4697fa666
commit 35593dada1
3 changed files with 41 additions and 16 deletions
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8
Makefile
View File

@ -39,6 +39,7 @@ default: fdimage.img
# Host utils
utils/%: src/utils/%.c
mkdir -p utils
$(CC) -o $@ $<
# Boot sectors
@ -46,8 +47,8 @@ boot/%.bs: boot/%.asm
$(NASM) $(NASM_ARGS) -DFLOPPY=$(FLOPPY) -o $@ $<
# BIOS option roms
rom/%.rom: rom/%.asm
$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom.sh $@
rom/%.rom: rom/%.asm utils/fix-rom
$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom $@
# Regular COM programs
com/%.com: com/%.asm
@ -70,7 +71,8 @@ hdimage.img: boot/mbr.bs fdimage.img
clean:
find -name '*.lst' -delete
rm -f $$(cat .gitignore) boot/*.bs com/*.com rom/*.rom utils/emul
rm -f $$(cat .gitignore) boot/*.bs com/*.com rom/*.rom utils/*
rmdir utils
qemu-floppy: fdimage.img $(ROMS)
$(QEMU) $(QEMU_ARGS) -boot a -fda fdimage.img

36
src/utils/fix-rom.c Normal file
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@ -0,0 +1,36 @@
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
struct stat sbuf;
int main(int argc, char** argv) {
FILE* fd = fopen(argv[1], "r+");
fstat(fileno(fd), &sbuf);
if (sbuf.st_size & 0x1F) {
fprintf(stderr, "Filesize is not a multiple of 512 bytes\n");
exit(1);
}
// Fill out filesize flag
fseek(fd, 2, SEEK_SET);
fputc(sbuf.st_size >> 9, fd);
// Calculate checksum
fseek(fd, 0, SEEK_SET);
off_t i;
uint8_t s;
for (i=0; i<sbuf.st_size; i++) {
s+=fgetc(fd);
}
// Edit last byte so that checksum is 0
fseek(fd, -1, SEEK_END);
s=fgetc(fd)-s;
fseek(fd, -1, SEEK_END);
fputc(s, fd);
fclose(fd);
}

13
utils/fix-rom.sh
View File

@ -1,13 +0,0 @@
#!/bin/sh
setbyte() {
printf "\x$3"|dd status=none seek="$2" bs=1 count=1 conv=notrunc of="$1"
}
[ -n "$1" ] || exit 1
setbyte "$1" 2 $(stat -c "%s" "$1"|awk '{printf("%02x",$1/512)}')
setbyte "$1" 41 00
checksum=$(xxd -p -c 1 "$1"|sed 's/^/0x/'|awk '{s+=$1} END {printf("%02x\n",256-s%256)}')
setbyte "$1" 41 "$checksum"