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30 * BSDI doscmd_loader.c,v 2.3 1996/04/08 19:32:33 bostic Exp
40 * reserve space in "low" memory for the interrupt vector table
42 static const char filler[4096] = { 0, };
44 #define _PATH_DOS_KERNEL_DIR "/usr/libexec/"
45 #define _PATH_DOS_KERNEL "doscmd.kernel"
54 if ((fp = fopen(_PATH_DOS_KERNEL, "r")) == NULL &&
55 (fp = fopen("obj/" _PATH_DOS_KERNEL, "r")) == NULL &&
56 (fp = fopen(_PATH_DOS_KERNEL_DIR _PATH_DOS_KERNEL, "r")) == NULL &&
57 (fp = fopen(getenv("DOS_KERNEL"), "r")) == NULL)
58 err(1, "load_kernel");
60 if (fread(&exec, sizeof(exec), 1, fp) != 1 || N_GETMAGIC(exec) != OMAGIC)
61 errx(1, "bad kernel file format");
63 start_address = exec.a_entry & (~(getpagesize() - 1));
64 if (brk(start_address + exec.a_text + exec.a_data + exec.a_bss) < 0)
65 err(1, "load_kernel");
66 fread((char *)start_address, exec.a_text + exec.a_data, 1, fp);
67 bzero((char *)(start_address + exec.a_text + exec.a_data), exec.a_bss);
73 main(int argc, char **argv, char **environ)
75 void (*entry_point)();
77 int fd = open("/dev/mem", 0);
87 entry_point = (void (*)()) load_kernel();
90 if (read(fd, 0, 0x500 != 0x500))
96 (*entry_point)(argc, argv, environ);
97 errx(1, "return from doscmd kernel???");