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Re: [PATCH v3 2/3] i386: Add support for loading from android bootimg


From: Shea Levy
Subject: Re: [PATCH v3 2/3] i386: Add support for loading from android bootimg
Date: Sun, 14 Feb 2016 08:21:21 -0500
User-agent: Roundcube Webmail/0.8.2

This patch uses grub_file_open, but the android bootimg is a disk, not a file. You mentioned something about file_offset_open, but that also expects an input file, not a disk. Should I modify your patch with my code I wrote to create a grub_file_t from an android_bootimg disk device, or is there another approach?

On 2016-02-12 16:16, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
On 12.02.2016 20:34, Shea Levy wrote:
OK. Do you have any thoughts on how best to extract the "load the kernel and set the command line to a specific string" functionality out of the
linux command, then?

At first I wanted to write a short skeleton patch to show what I meant but once skeleton is done, there is little actual code involved. Please
try attached patch
On 2016-02-12 14:22, Vladimir 'phcoder' Serbinenko wrote:
Separate command is better as it keeps interface tidy and unpoluted, decreasing maintenance cost. Correct me if I'm wrong but it should be
clear from context of file is Android image or usual linux one?

Le ven. 12 févr. 2016 20:19, Shea Levy <address@hidden> a écrit :

On 2016-02-12 12:50, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> On 08.02.2016 21:47, Shea Levy wrote:
>> ---
>>  grub-core/loader/i386/linux.c | 27 +++++++++++++++++++++------
>>  1 file changed, 21 insertions(+), 6 deletions(-)
>>
>> diff --git a/grub-core/loader/i386/linux.c
>> b/grub-core/loader/i386/linux.c
>> index fddcc46..6ab8d3c 100644
>> --- a/grub-core/loader/i386/linux.c
>> +++ b/grub-core/loader/i386/linux.c
>> @@ -35,6 +35,7 @@
>>  #include <grub/i18n.h>
>>  #include <grub/lib/cmdline.h>
>>  #include <grub/linux.h>
>> +#include <grub/android_bootimg.h>
>>
>>  GRUB_MOD_LICENSE ("GPLv3+");
>>
>> @@ -695,7 +696,13 @@ grub_cmd_linux (grub_command_t cmd
>> __attribute__ ((unused)),
>>        goto fail;
>>      }
>>
>> -  file = grub_file_open (argv[0]);
>> +  char android_cmdline[BOOT_ARGS_SIZE];
>> +  android_cmdline[0] = '';
>> +  if (grub_memcmp (argv[0], "android_bootimg:", sizeof
>> "android_bootimg:" - 1) == 0)
>> +    grub_android_bootimg_load_kernel (argv[0] + sizeof
>> "android_bootimg:" - 1,
>> +                                      &file, android_cmdline);
>> +  else
>> +      file = grub_file_open (argv[0]);
> I hoped more for autodetection. This gets a bit hairy and proper
> separation is better. Sorry for confusion. I think it's simpler with
> commands like
> android_bootimg [--no-cmdline] [--no-initrd] IMAGE [EXTRA_ARGUMENTS] > by default it will load both IMAGE, with cmdline and initrd. With
> --no-initrd you can use initrd for custom initrd.

Autodetection would be possible actually, I didn't think of that. If grub_file_open fails, we can try grub_android_bootimg_load_kernel on the
same file. Would that be preferable or do we still want a separate
command?

>
>>    if (! file)
>>      goto fail;
>>
>> @@ -1008,12 +1015,20 @@ grub_cmd_linux (grub_command_t cmd
>> __attribute__ ((unused)),
>>    linux_cmdline = grub_zalloc (maximal_cmdline_size + 1);
>>    if (!linux_cmdline)
>>      goto fail;
>> - grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
>> +  grub_size_t cmdline_offset = 0;
>> +  if (android_cmdline[0])
>> +    {
>> +      cmdline_offset = grub_strlen (android_cmdline) + 1;
>> + grub_memcpy (linux_cmdline, android_cmdline, cmdline_offset -
>> 1);
>> +      linux_cmdline[cmdline_offset - 1] = ' ';
>> +    }
>> + grub_memcpy (linux_cmdline + cmdline_offset, LINUX_IMAGE, sizeof
>> (LINUX_IMAGE));
>> +  cmdline_offset += sizeof LINUX_IMAGE - 1;
> LINUX_IMAGE must be at the beginning. don't forget brackets around
> sizeof.
>>    grub_create_loader_cmdline (argc, argv,
>> -                          linux_cmdline
>> -                          + sizeof (LINUX_IMAGE) - 1,
>> -                          maximal_cmdline_size
>> -                          - (sizeof (LINUX_IMAGE) - 1));
>> +                              linux_cmdline
>> +                              + cmdline_offset,
>> +                              maximal_cmdline_size
>> +                              - cmdline_offset);
>>
>>    len = prot_file_size;
>>    if (grub_file_read (file, prot_mode_mem, len) != len &&
>> !grub_errno)
>>
>
>
>
> _______________________________________________
> Grub-devel mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/grub-devel [1]

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