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

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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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] = '\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.
>    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)
> 



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