Re: [Qemu-devel] [PATCH] pc: Drop practically unused BOCHS BIOS debug ports

["Andreas Färber" <afaerber@suse.de>]

Am 11.09.2012 16:38, schrieb Jan Kiszka:
> We have debugcon these days to listen on those ports that receive debug
> messages. Also drop the others that have no effect anymore.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

This looks pretty identical to Hervé's "pc: remove DEBUG_BIOS define and
QEMU exit I/O ports", doesn't it? The discussion there concluded that
compatibility needs to be provided for older machines.

http://patchwork.ozlabs.org/patch/169542/
http://patchwork.ozlabs.org/patch/169543/

Andreas

> ---
>  hw/pc.c |   27 ---------------------------
>  1 files changed, 0 insertions(+), 27 deletions(-)
> 
> diff --git a/hw/pc.c b/hw/pc.c
> index 112739a..7e7e0e2 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -53,9 +53,6 @@
>  #include "bitmap.h"
>  #include "vga-pci.h"
>  
> -/* output Bochs bios info messages */
> -//#define DEBUG_BIOS
> -
>  /* debug PC/ISA interrupts */
>  //#define DEBUG_IRQ
>  
> @@ -534,17 +531,6 @@ static void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)
>      static int shutdown_index = 0;
>  
>      switch(addr) {
> -        /* Bochs BIOS messages */
> -    case 0x400:
> -    case 0x401:
> -        /* used to be panic, now unused */
> -        break;
> -    case 0x402:
> -    case 0x403:
> -#ifdef DEBUG_BIOS
> -        fprintf(stderr, "%c", val);
> -#endif
> -        break;
>      case 0x8900:
>          /* same as Bochs power off */
>          if (val == shutdown_str[shutdown_index]) {
> @@ -558,16 +544,9 @@ static void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)
>          }
>          break;
>  
> -        /* LGPL'ed VGA BIOS messages */
>      case 0x501:
>      case 0x502:
>          exit((val << 1) | 1);
> -    case 0x500:
> -    case 0x503:
> -#ifdef DEBUG_BIOS
> -        fprintf(stderr, "%c", val);
> -#endif
> -        break;
>      }
>  }
>  
> @@ -596,17 +575,11 @@ static void *bochs_bios_init(void)
>      uint64_t *numa_fw_cfg;
>      int i, j;
>  
> -    register_ioport_write(0x400, 1, 2, bochs_bios_write, NULL);
> -    register_ioport_write(0x401, 1, 2, bochs_bios_write, NULL);
> -    register_ioport_write(0x402, 1, 1, bochs_bios_write, NULL);
> -    register_ioport_write(0x403, 1, 1, bochs_bios_write, NULL);
>      register_ioport_write(0x8900, 1, 1, bochs_bios_write, NULL);
>  
>      register_ioport_write(0x501, 1, 1, bochs_bios_write, NULL);
>      register_ioport_write(0x501, 1, 2, bochs_bios_write, NULL);
>      register_ioport_write(0x502, 1, 2, bochs_bios_write, NULL);
> -    register_ioport_write(0x500, 1, 1, bochs_bios_write, NULL);
> -    register_ioport_write(0x503, 1, 1, bochs_bios_write, NULL);
>  
>      fw_cfg = fw_cfg_init(BIOS_CFG_IOPORT, BIOS_CFG_IOPORT + 1, 0, 0);
>  
> 


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