Re: [Qemu-devel] [patch] Support Windows NT 4

[Fabrice Bellard]

Applied.

Fabrice.

Ben Pfaff wrote:
> The following patch allows the CVS version of qemu to install and
> boot Windows NT 4, as long as the `-isa' flag is used.  Without
> the patch, trying to install NT 4 will fail because no hard disk
> will be detected.  Almost unbelievably, NT 4 won't detect a hard
> drive unless the CMOS RAM says that it is there.
>
> Even with this fix, WNT4 can't see the hard drives if PCI support
> is turned on.  There must be something else to track down too.
>
> Index: hw/ide.c
> ===================================================================
> RCS file: /cvsroot/qemu/qemu/hw/ide.c,v
> retrieving revision 1.26
> diff -u -p -u -r1.26 ide.c
> --- hw/ide.c    25 Jun 2004 14:54:19 -0000      1.26
> +++ hw/ide.c    13 Jul 2004 20:13:33 -0000
> @@ -1875,6 +1875,7 @@ static void ide_init2(IDEState *ide_stat
>                      s->heads = 16;
>                      s->sectors = 63;
>                  }
> +                bdrv_set_geometry_hint(s->bs, s->cylinders, s->heads, 
> s->sectors);
>              }
>              if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
>                  s->is_cdrom = 1;
> Index: hw/pc.c
> ===================================================================
> RCS file: /cvsroot/qemu/qemu/hw/pc.c,v
> retrieving revision 1.25
> diff -u -p -u -r1.25 pc.c
> --- hw/pc.c     26 Jun 2004 15:53:17 -0000      1.25
> +++ hw/pc.c     13 Jul 2004 20:13:33 -0000
> @@ -101,13 +101,32 @@ static int cmos_get_fd_drive_type(int fd
>      return val;
>  }
>  
> -static void cmos_init(int ram_size, int boot_device)
> +static void cmos_init_hd(int type_ofs, int info_ofs, BlockDriverState *hd) 
> +{
> +    RTCState *s = rtc_state;
> +    int cylinders, heads, sectors;
> +    bdrv_get_geometry_hint(hd, &cylinders, &heads, &sectors);
> +    rtc_set_memory(s, type_ofs, 47);
> +    rtc_set_memory(s, info_ofs, cylinders);
> +    rtc_set_memory(s, info_ofs + 1, cylinders >> 8);
> +    rtc_set_memory(s, info_ofs + 2, heads);
> +    rtc_set_memory(s, info_ofs + 3, 0xff);
> +    rtc_set_memory(s, info_ofs + 4, 0xff);
> +    rtc_set_memory(s, info_ofs + 5, 0xc0 | ((heads > 8) << 3));
> +    rtc_set_memory(s, info_ofs + 6, cylinders);
> +    rtc_set_memory(s, info_ofs + 7, cylinders >> 8);
> +    rtc_set_memory(s, info_ofs + 8, sectors);
> +}
> +
> +/* hd_table must contain 4 block drivers */
> +static void cmos_init(int ram_size, int boot_device, BlockDriverState 
> **hd_table)
>  {
>      RTCState *s = rtc_state;
>      int val;
>      int fd0, fd1, nb;
>      time_t ti;
>      struct tm *tm;
> +    int i;
>  
>      /* set the CMOS date */
>      time(&ti);
> @@ -187,6 +206,35 @@ static void cmos_init(int ram_size, int 
>      val |= 0x04; /* PS/2 mouse installed */
>      rtc_set_memory(s, REG_EQUIPMENT_BYTE, val);
>  
> +    /* hard drives */
> +
> +    rtc_set_memory(s, 0x12, (hd_table[0] ? 0xf0 : 0) | (hd_table[1] ? 0x0f : 
> 0));
> +    if (hd_table[0])
> +        cmos_init_hd(0x19, 0x1b, hd_table[0]);
> +    if (hd_table[1]) 
> +        cmos_init_hd(0x1a, 0x24, hd_table[1]);
> +
> +    val = 0;
> +    for (i = 0; i < 4; i++)
> +        if (hd_table[i]) {
> +            int cylinders, heads, sectors;
> +            uint8_t translation;
> +            
> +            bdrv_get_geometry_hint(hd_table[i], &cylinders, &heads, &sectors);
> +            if (cylinders <= 1024 && cylinders <= 16 && sectors <= 63) {
> +                /* No translation. */
> +                translation = 0;
> +            } else if (cylinders * heads > 131072) {
> +                /* LBA translation. */
> +                translation = 1;
> +            } else {
> +                /* LARGE translation. */
> +                translation = 2;
> +            }
> +
> +            val |= translation << (i * 2);
> +        }
> +    rtc_set_memory(s, 0x39, val);
>  }
>  
>  static void speaker_ioport_write(void *opaque, uint32_t addr, uint32_t val)
> @@ -506,7 +554,7 @@ void pc_init(int ram_size, int vga_ram_s
>  
>      floppy_controller = fdctrl_init(6, 2, 0, 0x3f0, fd_table);
>  
> -    cmos_init(ram_size, boot_device);
> +    cmos_init(ram_size, boot_device, bs_table);
>  
>      /* must be done after all PCI devices are instanciated */
>      /* XXX: should be done in the Bochs BIOS */