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Annotation of cci/sys/stand/boot.c, revision 1.1

1.1     ! root        1: /*     boot.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 "../machine/mtpr.h"
        !             8: #include <a.out.h>
        !             9: #include "saio.h"
        !            10: #include "../h/reboot.h"
        !            11: 
        !            12: /*
        !            13:  * Boot program... arguments passed in r10 and r11 determine
        !            14:  * whether boot stops to ask for system name and which device
        !            15:  * boot comes from.
        !            16:  */
        !            17: 
        !            18: /*     r11 = 0 -> automatic boot, load file '/vmunix' */
        !            19: /*     r11 = 1 -> ask user for file to load */
        !            20: 
        !            21: /* Types in r10 specifying major device */
        !            22: char   devname[][3] = {
        !            23:        'f','s','d',    /* 0 = fsd */
        !            24:        's','m','d',    /* 1 = smd or cmd */
        !            25:        'x','f','d',    /* 2 = xfd */
        !            26:        'x','s','d',    /* 2 = xsd */
        !            27:        'c','y','p',    /* 3 = cypher tape */
        !            28: };
        !            29: 
        !            30: #ifdef FSD
        !            31: char line[100] = "fsd(0,0)vmunix";
        !            32: #endif
        !            33: #ifdef SMD
        !            34: char line[100] = "smd(0,0)vmunix";
        !            35: #endif
        !            36: #ifdef XFD
        !            37: char line[100] = "xfd(0,0)vmunix";
        !            38: #endif
        !            39: #ifdef XSD
        !            40: char line[100] = "xsd(0,0)vmunix";
        !            41: #endif
        !            42: #ifdef JUSTASK
        !            43: char line[100];
        !            44: #endif
        !            45: 
        !            46: int    retry = 0;
        !            47: 
        !            48: main()
        !            49: {
        !            50:        register dummy;         /* skip r12 */
        !            51:        register howto, devtype;        /* howto=r11, devtype=r10 */
        !            52:        int io;
        !            53: 
        !            54: #ifdef lint
        !            55:        howto = 0; devtype = 0;
        !            56: #endif
        !            57:        printf("\nBoot\n");
        !            58: #ifdef JUSTASK
        !            59:        howto = RB_ASKNAME|RB_SINGLE;
        !            60: #endif
        !            61:        for (;;) {
        !            62:                if (howto & RB_ASKNAME) {
        !            63:                        printf(": ");
        !            64:                        gets(line);
        !            65:                } else
        !            66:                        printf(": %s\n", line);
        !            67:                io = open(line, 0);
        !            68:                if (io >= 0)
        !            69:                        copyunix(howto, io);
        !            70:                if (++retry > 2)
        !            71:                        howto |= RB_SINGLE|RB_ASKNAME;
        !            72:        }
        !            73: }
        !            74: 
        !            75: /*ARGSUSED*/
        !            76: copyunix(howto, io)
        !            77:        register io, howto;
        !            78: {
        !            79:        struct exec x;
        !            80:        register int i;
        !            81:        char *addr;
        !            82: 
        !            83:        i = read(io, (char *)&x, sizeof x);
        !            84:        if (i != sizeof x ||
        !            85:            (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
        !            86:                _stop("Bad format\n");
        !            87:        printf("%d", x.a_text);
        !            88:        if (x.a_magic == 0413 && lseek(io, 0x400, 0) == -1)
        !            89:                goto shread;
        !            90:        if (read(io, (char *)0x800, x.a_text) != x.a_text)
        !            91:                goto shread;
        !            92:        addr = (char *)(x.a_text + 0x800);
        !            93:        if (x.a_magic == 0413 || x.a_magic == 0410)
        !            94:                while ((int)addr & CLOFSET)
        !            95:                        *addr++ = 0;
        !            96:        printf("+%d", x.a_data);
        !            97:        if (read(io, addr, x.a_data) != x.a_data)
        !            98:                goto shread;
        !            99:        addr += x.a_data;
        !           100:        printf("+%d", x.a_bss);
        !           101:        x.a_bss += 32*1024;     /* slop */
        !           102:        for (i = 0; i < x.a_bss; i++)
        !           103:                *addr++ = 0;
        !           104:        x.a_entry &= 0x1fffffff;
        !           105:        printf(" start 0x%x\n", x.a_entry);
        !           106:        mtpr (0, PADC);         /* Purge data cache */
        !           107:        mtpr (0, PACC);         /* Purge code cache */
        !           108:        if (!(howto & RB_DCOFF)) 
        !           109:                mtpr (1, DCR);  /* Enable data cache */
        !           110:        (*((int (*)()) x.a_entry))();
        !           111: shread:
        !           112:        _stop("Short read\n");
        !           113: }

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