machine.c

xen虚拟机源代码安装包

#include "hw/hw.h"
#include "hw/boards.h"
#include "hw/pc.h"
#include "hw/isa.h"

#include "exec-all.h"

void register_machines(void)
{
    qemu_register_machine(&pc_machine);
    qemu_register_machine(&isapc_machine);
}

static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)
{
    qemu_put_be32(f, dt->selector);
    qemu_put_betl(f, dt->base);
    qemu_put_be32(f, dt->limit);
    qemu_put_be32(f, dt->flags);
}

static void cpu_get_seg(QEMUFile *f, SegmentCache *dt)
{
    dt->selector = qemu_get_be32(f);
    dt->base = qemu_get_betl(f);
    dt->limit = qemu_get_be32(f);
    dt->flags = qemu_get_be32(f);
}

void cpu_save(QEMUFile *f, void *opaque)
{
    CPUState *env = opaque;
    uint16_t fptag, fpus, fpuc, fpregs_format;
    uint32_t hflags;
    int32_t a20_mask;
    int i;

    for(i = 0; i < CPU_NB_REGS; i++)
        qemu_put_betls(f, &env->regs[i]);
    qemu_put_betls(f, &env->eip);
    qemu_put_betls(f, &env->eflags);
    hflags = env->hflags; /* XXX: suppress most of the redundant hflags */
    qemu_put_be32s(f, &hflags);

    /* FPU */
    fpuc = env->fpuc;
    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
    fptag = 0;
    for(i = 0; i < 8; i++) {
        fptag |= ((!env->fptags[i]) << i);
    }

    qemu_put_be16s(f, &fpuc);
    qemu_put_be16s(f, &fpus);
    qemu_put_be16s(f, &fptag);

#ifdef USE_X86LDOUBLE
    fpregs_format = 0;
#else
    fpregs_format = 1;
#endif
    qemu_put_be16s(f, &fpregs_format);

    for(i = 0; i < 8; i++) {
#ifdef USE_X86LDOUBLE
        {
            uint64_t mant;
            uint16_t exp;
            /* we save the real CPU data (in case of MMX usage only 'mant'
               contains the MMX register */
            cpu_get_fp80(&mant, &exp, env->fpregs[i].d);
            qemu_put_be64(f, mant);
            qemu_put_be16(f, exp);
        }
#else
        /* if we use doubles for float emulation, we save the doubles to
           avoid losing information in case of MMX usage. It can give
           problems if the image is restored on a CPU where long
           doubles are used instead. */
        qemu_put_be64(f, env->fpregs[i].mmx.MMX_Q(0));
#endif
    }

    for(i = 0; i < 6; i++)
        cpu_put_seg(f, &env->segs[i]);
    cpu_put_seg(f, &env->ldt);
    cpu_put_seg(f, &env->tr);
    cpu_put_seg(f, &env->gdt);
    cpu_put_seg(f, &env->idt);

    qemu_put_be32s(f, &env->sysenter_cs);
    qemu_put_be32s(f, &env->sysenter_esp);
    qemu_put_be32s(f, &env->sysenter_eip);

    qemu_put_betls(f, &env->cr[0]);
    qemu_put_betls(f, &env->cr[2]);
    qemu_put_betls(f, &env->cr[3]);
    qemu_put_betls(f, &env->cr[4]);

    for(i = 0; i < 8; i++)
        qemu_put_betls(f, &env->dr[i]);

    /* MMU */
    a20_mask = (int32_t) env->a20_mask;
    qemu_put_be32s(f, &a20_mask);

    /* XMM */
    qemu_put_be32s(f, &env->mxcsr);
    for(i = 0; i < CPU_NB_REGS; i++) {
        qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(0));
        qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(1));
    }

#ifdef TARGET_X86_64
    qemu_put_be64s(f, &env->efer);
    qemu_put_be64s(f, &env->star);
    qemu_put_be64s(f, &env->lstar);
    qemu_put_be64s(f, &env->cstar);
    qemu_put_be64s(f, &env->fmask);
    qemu_put_be64s(f, &env->kernelgsbase);
#endif
    qemu_put_be32s(f, &env->smbase);
}

#ifdef USE_X86LDOUBLE
/* XXX: add that in a FPU generic layer */
union x86_longdouble {
    uint64_t mant;
    uint16_t exp;
};

#define MANTD1(fp)	(fp & ((1LL << 52) - 1))
#define EXPBIAS1 1023
#define EXPD1(fp)	((fp >> 52) & 0x7FF)
#define SIGND1(fp)	((fp >> 32) & 0x80000000)

static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)
{
    int e;
    /* mantissa */
    p->mant = (MANTD1(temp) << 11) | (1LL << 63);
    /* exponent + sign */
    e = EXPD1(temp) - EXPBIAS1 + 16383;
    e |= SIGND1(temp) >> 16;
    p->exp = e;
}
#endif

int cpu_load(QEMUFile *f, void *opaque, int version_id)
{
    CPUState *env = opaque;
    int i, guess_mmx;
    uint32_t hflags;
    uint16_t fpus, fpuc, fptag, fpregs_format;
    int32_t a20_mask;

    if (version_id != 3 && version_id != 4)
        return -EINVAL;
    for(i = 0; i < CPU_NB_REGS; i++)
        qemu_get_betls(f, &env->regs[i]);
    qemu_get_betls(f, &env->eip);
    qemu_get_betls(f, &env->eflags);
    qemu_get_be32s(f, &hflags);

    qemu_get_be16s(f, &fpuc);
    qemu_get_be16s(f, &fpus);
    qemu_get_be16s(f, &fptag);
    qemu_get_be16s(f, &fpregs_format);

    /* NOTE: we cannot always restore the FPU state if the image come
       from a host with a different 'USE_X86LDOUBLE' define. We guess
       if we are in an MMX state to restore correctly in that case. */
    guess_mmx = ((fptag == 0xff) && (fpus & 0x3800) == 0);
    for(i = 0; i < 8; i++) {
        uint64_t mant;
        uint16_t exp;

        switch(fpregs_format) {
        case 0:
            mant = qemu_get_be64(f);
            exp = qemu_get_be16(f);
#ifdef USE_X86LDOUBLE
            env->fpregs[i].d = cpu_set_fp80(mant, exp);
#else
            /* difficult case */
            if (guess_mmx)
                env->fpregs[i].mmx.MMX_Q(0) = mant;
            else
                env->fpregs[i].d = cpu_set_fp80(mant, exp);
#endif
            break;
        case 1:
            mant = qemu_get_be64(f);
#ifdef USE_X86LDOUBLE
            {
                union x86_longdouble *p;
                /* difficult case */
                p = (void *)&env->fpregs[i];
                if (guess_mmx) {
                    p->mant = mant;
                    p->exp = 0xffff;
                } else {
                    fp64_to_fp80(p, mant);
                }
            }
#else
            env->fpregs[i].mmx.MMX_Q(0) = mant;
#endif
            break;
        default:
            return -EINVAL;
        }
    }

    env->fpuc = fpuc;
    /* XXX: restore FPU round state */
    env->fpstt = (fpus >> 11) & 7;
    env->fpus = fpus & ~0x3800;
    fptag ^= 0xff;
    for(i = 0; i < 8; i++) {
        env->fptags[i] = (fptag >> i) & 1;
    }

    for(i = 0; i < 6; i++)
        cpu_get_seg(f, &env->segs[i]);
    cpu_get_seg(f, &env->ldt);
    cpu_get_seg(f, &env->tr);
    cpu_get_seg(f, &env->gdt);
    cpu_get_seg(f, &env->idt);

    qemu_get_be32s(f, &env->sysenter_cs);
    qemu_get_be32s(f, &env->sysenter_esp);
    qemu_get_be32s(f, &env->sysenter_eip);

    qemu_get_betls(f, &env->cr[0]);
    qemu_get_betls(f, &env->cr[2]);
    qemu_get_betls(f, &env->cr[3]);
    qemu_get_betls(f, &env->cr[4]);

    for(i = 0; i < 8; i++)
        qemu_get_betls(f, &env->dr[i]);

    /* MMU */
    qemu_get_be32s(f, &a20_mask);
    env->a20_mask = a20_mask;

    qemu_get_be32s(f, &env->mxcsr);
    for(i = 0; i < CPU_NB_REGS; i++) {
        qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(0));
        qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(1));
    }

#ifdef TARGET_X86_64
    qemu_get_be64s(f, &env->efer);
    qemu_get_be64s(f, &env->star);
    qemu_get_be64s(f, &env->lstar);
    qemu_get_be64s(f, &env->cstar);
    qemu_get_be64s(f, &env->fmask);
    qemu_get_be64s(f, &env->kernelgsbase);
#endif
    if (version_id >= 4)
        qemu_get_be32s(f, &env->smbase);

    /* XXX: compute hflags from scratch, except for CPL and IIF */
    env->hflags = hflags;
    tlb_flush(env, 1);
    return 0;
}