Subversion Repositories planix.SVN

#include        "u.h"
#include        "../port/lib.h"
#include        "mem.h"
#include        "dat.h"
#include        "fns.h"
#include        "io.h"
#include        "ureg.h"

enum {
        Ax,
        Bx,
        Cx,
        Dx,

        /*
         * common to intel & amd
         */
        Extfunc = 0x80000000,
        Procsig,

        /* Procsig bits */
        Dxlongmode      = 1<<29,
};

typedef unsigned long long u64intptr;

static int
havelongmode(void)
{
        ulong regs[4];

        memset(regs, 0, sizeof regs);
        cpuid(Extfunc, regs);
        if(regs[Ax] < Extfunc)
                return 0;

        memset(regs, 0, sizeof regs);
        cpuid(Procsig, regs);
        return (regs[Dx] & Dxlongmode) != 0;
}

void
warp64(uvlong entry)
{
        u64intptr kzero64 = 0xfffffffff0000000ull;
        extern void _warp64(ulong);

        print("warp64(%#llux) %#llux %d\n", entry, entry & ~kzero64, nmmap);
        if(!havelongmode()) {
                print("can't run 64-bit kernel on 32-bit cpu\n");
                delay(5000);
                exit(0);
        }
        if(v_flag)
                print("mkmultiboot\n");
        mkmultiboot();
        if(v_flag)
                print("impulse\n");
        /*
         * No output after impulse().
         */
        if(v_flag)
                print("_warp64\n");
        impulse();
        _warp64(entry & ~kzero64);
}