(request) grub2 v1.97 how to debug and what is the real implement of b->allocate_pages.

(request) grub2 v1.97 how to debug and what is the real implement of b->allocate_pages.

[cr os]

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Dears,
I'm pulzzed with some problems when reading grub2 v1.97 source code. Could
you please help me?

Q1: About grub2 debug. Where does the grub2 log file(exist?) locate? Such
as grub_dprintf, grub_fatal, grub_error function calls. Grub2 is a
bootloader, it will load OS later, so the file system still not ready for
grub2 creating a log file at that time, does it? Then how to debug grub2?

Q2: About efi_call_4 function call. For an example, grub2 v1.97, in
grub2\kern\efi\mm.c  grub_efi_allocate_pages function:
efi_call_4 (b->allocate_pages, type, GRUB_EFI_LOADER_DATA, pages, &address);
I couldn't find the real function define of the pointer
"b->allocate_pages", what will be call after the efi_call_4(as below)
function been called?

Thanks! Wating for your kind feedback.

crosvia

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Re: (request) grub2 v1.97 how to debug and what is the real implement of b->allocate_pages.

[Phillip Susi]

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On 11/26/2012 10:34 PM, cr os wrote:
> Dears, I'm pulzzed with some problems when reading grub2 v1.97
> source code. Could you please help me?
> 
> Q1: About grub2 debug. Where does the grub2 log file(exist?)
> locate? Such as grub_dprintf, grub_fatal, grub_error function
> calls. Grub2 is a bootloader, it will load OS later, so the file
> system still not ready for grub2 creating a log file at that time,
> does it? Then how to debug grub2?

There is no log file; you set the debug variable to cause the messages
to be printed to the screen ( or serial console if you are using that ).

> Q2: About efi_call_4 function call. For an example, grub2 v1.97,
> in grub2\kern\efi\mm.c  grub_efi_allocate_pages function: 
> efi_call_4 (b->allocate_pages, type, GRUB_EFI_LOADER_DATA, pages,
> &address); I couldn't find the real function define of the pointer 
> "b->allocate_pages", what will be call after the efi_call_4(as
> below) function been called?

I haven't looked at the code in question but from the sound of it, you
are talking about calling one of the EFI system functions provided by
the system firmware.



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