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SubjectRe: [PATCH v4 2/4] x86/boot: Add acpitb.c to parse acpi tables
On Fri, Aug 03, 2018 at 10:00:48AM +0800, Dou Liyang wrote:
>
>
>At 07/23/2018 05:29 PM, Chao Fan wrote:
>> Imitate the ACPI code to parse ACPI tables. Functions are simplified
>> cause some operations are not needed here.
>> And also, this method won't influence the initialization of ACPI.
>>
>> Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
>
>Hi Fan,
>
>I know you got the code from acpica subsystem and EFI code... and do
>many adaptation work for KASLR. It's awesome!
>
>I think you can add some other simple comments.
>
> - what differences between your function and the function you based on
> and why did you do that?
>
>... to make this more credible and easy to remember the details as time
>goes on.

That's a good idea, will add more comments.

>
>Also some concerns below.
>> ---
>[...]
>> + else if (!strncmp(sig, EFI32_LOADER_SIGNATURE, 4))
>> + efi_64 = false;
>> + else {
>> + debug_putstr("Wrong efi loader signature.\n");
>
>s/efi/EFI/, also need fix in the comments below.
>
>> + return false;
>> + }
>> +
>[...]
>> + /*
>> + * Get rsdp from efi tables.
>> + * If we find acpi table, go on searching for acpi20 table.
>> + * If we didn't get acpi20 table then use acpi table.
>> + * If neither acpi table nor acpi20 table found,
>> + * return false.
>> + */
>> + if (!(efi_guidcmp(guid, ACPI_TABLE_GUID)) && !acpi_20) {
>> + *rsdp_addr = (acpi_physical_address)table;
>> + acpi_20 = false;
>> + find_rsdp = true;
>> + } else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) {
>> + *rsdp_addr = (acpi_physical_address)table;
>> + acpi_20 = true;
>> + return true;
>
>If we find the ACPI 2.0, we will return immediately, so the variable and
>logic of _acpi_20_ is redundant.

I will check the logical and fix the mistake.

Thanks,
Chao Fan

>
>Thanks,
> dou


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