static int mode_sense_page(SCSIRequest *req, int page, uint8_t *p)

{

    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);

    BlockDriverState *bdrv = s->bs;

    int cylinders, heads, secs;



    switch (page) {

    case 4: 

        p[0] = 4;

        p[1] = 0x16;

        

        bdrv_get_geometry_hint(bdrv, &cylinders, &heads, &secs);

        p[2] = (cylinders >> 16) & 0xff;

        p[3] = (cylinders >> 8) & 0xff;

        p[4] = cylinders & 0xff;

        p[5] = heads & 0xff;

        

        p[6] = (cylinders >> 16) & 0xff;

        p[7] = (cylinders >> 8) & 0xff;

        p[8] = cylinders & 0xff;

        

        p[9] = (cylinders >> 16) & 0xff;

        p[10] = (cylinders >> 8) & 0xff;

        p[11] = cylinders & 0xff;

        

        p[12] = 0;

        p[13] = 200;

        

        p[14] = 0xff;

        p[15] =  0xff;

        p[16] = 0xff;

        

        p[20] = (5400 >> 8) & 0xff;

        p[21] = 5400 & 0xff;

        return 0x16;



    case 5: 

        p[0] = 5;

        p[1] = 0x1e;

        

        p[2] = 5000 >> 8;

        p[3] = 5000 & 0xff;

        

        bdrv_get_geometry_hint(bdrv, &cylinders, &heads, &secs);

        p[4] = heads & 0xff;

        p[5] = secs & 0xff;

        p[6] = s->cluster_size * 2;

        p[8] = (cylinders >> 8) & 0xff;

        p[9] = cylinders & 0xff;

        

        p[10] = (cylinders >> 8) & 0xff;

        p[11] = cylinders & 0xff;

        

        p[12] = (cylinders >> 8) & 0xff;

        p[13] = cylinders & 0xff;

        

        p[14] = 0;

        p[15] = 1;

        

        p[16] = 1;

        

        p[17] = 0;

        p[18] = 1;

        

        p[19] = 1;

        

        p[20] = 1;

        

        p[28] = (5400 >> 8) & 0xff;

        p[29] = 5400 & 0xff;

        return 0x1e;



    case 8: 

        p[0] = 8;

        p[1] = 0x12;

        if (bdrv_enable_write_cache(s->bs)) {

            p[2] = 4; 

        }

        return 20;



    case 0x2a: 

        if (bdrv_get_type_hint(bdrv) != BDRV_TYPE_CDROM)

            return 0;

        p[0] = 0x2a;

        p[1] = 0x14;

        p[2] = 3; 

        p[3] = 0; 

        p[4] = 0x7f; 



        p[5] = 0xff; 





        p[6] = 0x2d | (bdrv_is_locked(s->bs)? 2 : 0);

        

        p[7] = 0; 



        p[8] = (50 * 176) >> 8; 

        p[9] = (50 * 176) & 0xff;

        p[10] = 0 >> 8; 

        p[11] = 0 & 0xff;

        p[12] = 2048 >> 8; 

        p[13] = 2048 & 0xff;

        p[14] = (16 * 176) >> 8; 

        p[15] = (16 * 176) & 0xff;

        p[18] = (16 * 176) >> 8; 

        p[19] = (16 * 176) & 0xff;

        p[20] = (16 * 176) >> 8;  current

        p[21] = (16 * 176) & 0xff;

        return 22;



    default:

        return 0;

    }

}
