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Annotation of 42BSD/sys/stand/bootup.c, revision 1.1.1.1

1.1       root        1: /*     bootup.c        6.1     83/07/29        */
                      2: 
                      3: #include "../h/param.h"
                      4: #include "../h/inode.h"
                      5: #include "../h/fs.h"
                      6: #include "../h/vm.h"
                      7: #include <a.out.h>
                      8: #include "saio.h"
                      9: #include "../h/reboot.h"
                     10: 
                     11: char bootprog[] = "up(0,0)boot";
                     12: 
                     13: /*
                     14:  * Boot program... arguments passed in r10 and r11
                     15:  * are passed through to the full boot program.
                     16:  */
                     17: 
                     18: main()
                     19: {
                     20:        register howto, devtype;        /* howto=r11, devtype=r10 */
                     21:        int io;
                     22: 
                     23: #ifdef lint
                     24:        howto = 0; devtype = 0;
                     25: #endif
                     26:        printf("loading %s", bootprog);
                     27:        io = open(bootprog, 0);
                     28:        if (io >= 0)
                     29:                copyunix(howto, devtype, io);
                     30:        printf("boot failed");
                     31:        _exit();
                     32: }
                     33: 
                     34: /*ARGSUSED*/
                     35: copyunix(howto, devtype, io)
                     36:        register howto, devtype, io;    /* howto=r11, devtype=r10 */
                     37: {
                     38:        struct exec x;
                     39:        register int i;
                     40:        char *addr;
                     41: 
                     42:        i = read(io, (char *)&x, sizeof x);
                     43:        if (i != sizeof x ||
                     44:            (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
                     45:                _stop("Bad format\n");
                     46:        if ((x.a_magic == 0413 || x.a_magic == 0410) &&
                     47:            lseek(io, 0x400, 0) == -1)
                     48:                goto shread;
                     49:        if (read(io, (char *)0, x.a_text) != x.a_text)
                     50:                goto shread;
                     51:        addr = (char *)x.a_text;
                     52:        if (x.a_magic == 0413 || x.a_magic == 0410)
                     53:                while ((int)addr & CLOFSET)
                     54:                        *addr++ = 0;
                     55:        if (read(io, addr, x.a_data) != x.a_data)
                     56:                goto shread;
                     57:        addr += x.a_data;
                     58:        x.a_bss += 128*512;     /* slop */
                     59:        for (i = 0; i < x.a_bss; i++)
                     60:                *addr++ = 0;
                     61:        x.a_entry &= 0x7fffffff;
                     62:        (*((int (*)()) x.a_entry))();
                     63:        _exit();
                     64: shread:
                     65:        _stop("Short read\n");
                     66: }

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