Re: [Qemu-devel] [PATCH] pc_sysfw: Always use alias for ISA BIOS region

[Jan Kiszka <jan.kiszka@web.de>]

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On 2012-11-01 18:15, Jordan Justen wrote:
> Would the old behavior need to be preserved for pc-1.1 & pc-1.2?

Why? This is just restoring the older, correct behavior.

Jan

> 
> -Jordan
> 
> On Thu, Nov 1, 2012 at 9:32 AM, Jan Kiszka <jan.kiszka@web.de> wrote:
>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>
>> This is no technical reason (anymore) for copying the ISA BIOS from the
>> original region. Instead, refactor pc_isa_bios_init to serve both pflash
>> and old-style BIOS setup.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>> ---
>>  hw/pc_sysfw.c |   42 +++++++++---------------------------------
>>  1 files changed, 9 insertions(+), 33 deletions(-)
>>
>> diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
>> index 9d7c5f4..07627df 100644
>> --- a/hw/pc_sysfw.c
>> +++ b/hw/pc_sysfw.c
>> @@ -41,36 +41,24 @@ typedef struct PcSysFwDevice {
>>  } PcSysFwDevice;
>>
>>  static void pc_isa_bios_init(MemoryRegion *rom_memory,
>> -                             MemoryRegion *flash_mem,
>> -                             int ram_size)
>> +                             MemoryRegion *bios)
>>  {
>> +    uint64_t bios_size = memory_region_size(bios);
>>      int isa_bios_size;
>>      MemoryRegion *isa_bios;
>> -    uint64_t flash_size;
>> -    void *flash_ptr, *isa_bios_ptr;
>> -
>> -    flash_size = memory_region_size(flash_mem);
>>
>>      /* map the last 128KB of the BIOS in ISA space */
>> -    isa_bios_size = flash_size;
>> +    isa_bios_size = bios_size;
>>      if (isa_bios_size > (128 * 1024)) {
>>          isa_bios_size = 128 * 1024;
>>      }
>>      isa_bios = g_malloc(sizeof(*isa_bios));
>> -    memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
>> -    vmstate_register_ram_global(isa_bios);
>> +    memory_region_init_alias(isa_bios, "isa-bios", bios,
>> +                             bios_size - isa_bios_size, isa_bios_size);
>>      memory_region_add_subregion_overlap(rom_memory,
>>                                          0x100000 - isa_bios_size,
>>                                          isa_bios,
>>                                          1);
>> -
>> -    /* copy ISA rom image from top of flash memory */
>> -    flash_ptr = memory_region_get_ram_ptr(flash_mem);
>> -    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
>> -    memcpy(isa_bios_ptr,
>> -           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
>> -           isa_bios_size);
>> -
>>      memory_region_set_readonly(isa_bios, true);
>>  }
>>
>> @@ -129,14 +117,14 @@ static void pc_system_flash_init(MemoryRegion *rom_memory,
>>                                           1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
>>      flash_mem = pflash_cfi01_get_memory(system_flash);
>>
>> -    pc_isa_bios_init(rom_memory, flash_mem, size);
>> +    pc_isa_bios_init(rom_memory, flash_mem);
>>  }
>>
>>  static void old_pc_system_rom_init(MemoryRegion *rom_memory)
>>  {
>>      char *filename;
>> -    MemoryRegion *bios, *isa_bios;
>> -    int bios_size, isa_bios_size;
>> +    MemoryRegion *bios;
>> +    int bios_size;
>>      int ret;
>>
>>      /* BIOS load */
>> @@ -167,19 +155,7 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory)
>>          g_free(filename);
>>      }
>>
>> -    /* map the last 128KB of the BIOS in ISA space */
>> -    isa_bios_size = bios_size;
>> -    if (isa_bios_size > (128 * 1024)) {
>> -        isa_bios_size = 128 * 1024;
>> -    }
>> -    isa_bios = g_malloc(sizeof(*isa_bios));
>> -    memory_region_init_alias(isa_bios, "isa-bios", bios,
>> -                             bios_size - isa_bios_size, isa_bios_size);
>> -    memory_region_add_subregion_overlap(rom_memory,
>> -                                        0x100000 - isa_bios_size,
>> -                                        isa_bios,
>> -                                        1);
>> -    memory_region_set_readonly(isa_bios, true);
>> +    pc_isa_bios_init(rom_memory, bios);
>>
>>      /* map all the bios at the top of memory */
>>      memory_region_add_subregion(rom_memory,
>> --
>> 1.7.3.4



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