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Annotation of 41BSD/4.0.upgrade/sys/stand/boot.c.ancient, revision 1.1

1.1     ! root        1: /*     boot.c  4.4     81/03/22        */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/ino.h"
        !             5: #include "../h/inode.h"
        !             6: #include "../h/filsys.h"
        !             7: #include "../h/dir.h"
        !             8: #include "../h/vm.h"
        !             9: #include <a.out.h>
        !            10: #include "saio.h"
        !            11: #include <sys/reboot.h>
        !            12: 
        !            13: /*
        !            14:  * Boot program... arguments passed in r10 and r11 determine
        !            15:  * whether boot stops to ask for system name and which device
        !            16:  * boot comes from.
        !            17:  */
        !            18: 
        !            19: /* Types in r10 specifying major device */
        !            20: char   devname[][2] = {
        !            21:        'h','p',        /* 0 = hp */
        !            22:        0,0,            /* 1 = ht */
        !            23:        'u','p',        /* 2 = up */
        !            24:        'h','k',        /* 3 = hk */
        !            25: };
        !            26: 
        !            27: char line[100] = "xx(0,0)vmunix";
        !            28: 
        !            29: int    retry = 0;
        !            30: 
        !            31: main()
        !            32: {
        !            33:        register howto, devtype;        /* howto=r11, devtype=r10 */
        !            34:        int io;
        !            35: 
        !            36: #ifdef lint
        !            37:        howto = 0; devtype = 0;
        !            38: #endif
        !            39:        printf("\nBoot\n");
        !            40: #ifdef JUSTASK
        !            41:        howto = RB_ASKNAME|RB_SINGLE;
        !            42: #else
        !            43:        if ((howto&RB_ASKNAME)==0) {
        !            44:                if (devtype>=0 && devtype<sizeof(devname)/2
        !            45:                    && devname[devtype][0]) {
        !            46:                        line[0] = devname[devtype][0];
        !            47:                        line[1] = devname[devtype][1];
        !            48:                } else
        !            49:                        howto = RB_SINGLE|RB_ASKNAME;
        !            50:        }
        !            51: #endif
        !            52:        for (;;) {
        !            53:                if (howto & RB_ASKNAME) {
        !            54:                        printf(": ");
        !            55:                        gets(line);
        !            56:                } else
        !            57:                        printf(": %s\n", line);
        !            58:                io = open(line, 0);
        !            59:                if (io >= 0)
        !            60:                        copyunix(howto, io);
        !            61:                if (++retry > 2)
        !            62:                        howto = RB_SINGLE|RB_ASKNAME;
        !            63:        }
        !            64: }
        !            65: 
        !            66: /*ARGSUSED*/
        !            67: copyunix(howto, io)
        !            68:        register howto, io;
        !            69: {
        !            70:        struct exec x;
        !            71:        register int i;
        !            72:        char *addr;
        !            73: 
        !            74:        i = read(io, (char *)&x, sizeof x);
        !            75:        if (i != sizeof x || x.a_magic != 0410)
        !            76:                _stop("Bad format\n");
        !            77:        printf("%d", x.a_text);
        !            78:        if (read(io, (char *)0, x.a_text) != x.a_text)
        !            79:                goto shread;
        !            80:        addr = (char *)x.a_text;
        !            81:        while ((int)addr & CLOFSET)
        !            82:                *addr++ = 0;
        !            83:        printf("+%d", x.a_data);
        !            84:        if (read(io, addr, x.a_data) != x.a_data)
        !            85:                goto shread;
        !            86:        addr += x.a_data;
        !            87:        printf("+%d", x.a_bss);
        !            88:        x.a_bss += 128*512;     /* slop */
        !            89:        for (i = 0; i < x.a_bss; i++)
        !            90:                *addr++ = 0;
        !            91:        x.a_entry &= 0x7fffffff;
        !            92:        printf(" start 0x%x\n", x.a_entry);
        !            93:        (*((int (*)()) x.a_entry))();
        !            94:        _exit();
        !            95: shread:
        !            96:        _stop("Short read\n");
        !            97: }

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