On Thu, Mar 7, 2013 at 9:57 PM, Tejun Heo <tj@xxxxxxxxxx> wrote:
> On Thu, Mar 07, 2013 at 08:58:31PM -0800, Yinghai Lu wrote:
>> diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
>> index 73afd11..ca08f0e 100644
>> --- a/arch/x86/kernel/head_32.S
>> +++ b/arch/x86/kernel/head_32.S
>> @@ -149,6 +149,10 @@ ENTRY(startup_32)
>> call load_ucode_bsp
>> #endif
>>
>> +#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
>> + call x86_acpi_override_find
>> +#endif
>
> The function is always defined. We can probalby lose ifdef here?
just mimic microcode updating again.
>
> Also, does it really have to be called from head_32.S? No way this
> can be done after entering C code? It would be great if you can
> explain overall design choices in the head message (and important
> patches).
have to be with head_32.S and it is with 32bit flat mode, so could access
4G blow without setting page table.
Will try add to more in the change log.
>
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 668e658..d43545a 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -424,6 +424,32 @@ static void __init reserve_initrd(void)
>> }
>> #endif /* CONFIG_BLK_DEV_INITRD */
>>
>> +#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
>> +void __init x86_acpi_override_find(void)
>> +{
>> + unsigned long ramdisk_image, ramdisk_size;
>> + unsigned char *p = NULL;
>> +
>> +#ifdef CONFIG_X86_32
>> + struct boot_params *boot_params_p;
>> +
>> + boot_params_p = (struct boot_params *)__pa_symbol(&boot_params);
>> + ramdisk_image = boot_params_p->hdr.ramdisk_image;
>> + ramdisk_size = boot_params_p->hdr.ramdisk_size;
>> + p = (unsigned char *)ramdisk_image;
>> + acpi_initrd_override_find(p, ramdisk_size, true);
>> +#else
>> + ramdisk_image = get_ramdisk_image();
>> + ramdisk_size = get_ramdisk_size();
>> + if (ramdisk_image)
>> + p = __va(ramdisk_image);
>> + acpi_initrd_override_find(p, ramdisk_size, false);
>> +#endif
>> +}
>> +#else
>> +void __init x86_acpi_override_find(void) { }
>
> And add a comment here why we're not doing static inline for the dummy
> function?
...
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