usr/src/cmd/standalone/boot.c

#include <sys/param.h>
#include <sys/ino.h>
#include <sys/inode.h>
#include <sys/filsys.h>
#include <sys/dir.h>
#include <saio.h>


char line[100];

main()
{
int i;
        segflag = 2;


        printf("Boot\n");
        do {
                printf(": "); gets(line);
                i = open(line,0);
        } while (i < 0);


        copyunix(i);

}


copyunix(io)
register io;
{
register addr,s;
long phys;
unsigned        txtsiz,datsiz,bsssiz;
int     magic;


        lseek(io, (off_t)0, 0);
        magic = getw(io);
        txtsiz = getw(io);
        datsiz = getw(io);
        bsssiz = getw(io);


        switch (magic) {
        case 0411:
                setseg(0);
                lseek(io, (long)(020+txtsiz), 0);

                for(addr=0; addr!=datsiz; addr+=2)  {
                        mtpi(getw(io),addr);
                }

                clrseg(addr,bsssiz);

                phys = (long)datsiz + (long)bsssiz + 63L;
                phys =/ 64;
                setseg((int)phys);

                lseek(io, 020L, 0);

                for(addr=0; addr!=txtsiz; addr+=2) {
                        mtpi(getw(io),addr);
                }
                return;
        case 0407:
                setseg(0);
                /*
                 * space over the header. We do this instead of seeking
                 * because the input might be a tape which doesn't know
                 * how to seek.
                 */
                getw(io); getw(io); getw(io); getw(io);
                phys = txtsiz+datsiz;
                for (addr = 0; addr != phys; addr += 2)
                        mtpi(getw(io),addr);
                clrseg(addr, bsssiz);
                return;
        default:
                printf("Can't load %o files\n", magic);
                exit(1);
        }
}