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Annotation of 42BSD/sys/stand/bootra.c, revision 1.1

1.1     ! root        1: /*     bootra.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[] = "ra(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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