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List:       grub-devel
Subject:    Re: [PATCH v3 2/6] efi: add grub_efi_get_ram_base() function for arm64
From:       Leif Lindholm <leif.lindholm () linaro ! org>
Date:       2018-07-06 16:24:02
Message-ID: 20180706162402.bmszr7ggrdnwgxdd () bivouac ! eciton ! net
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On Fri, Jul 06, 2018 at 05:12:27PM +0200, Daniel Kiper wrote:
> On Wed, Jun 27, 2018 at 06:17:16PM +0100, Leif Lindholm wrote:
> > Since ARM platforms do not have a common memory map, add a helper
> > function that finds the lowest address region with the EFI_MEMORY_WB
> > attribute set in the UEFI memory map.
> >
> > Required for the arm64 efi linux loader to restrict the initrd
> > location to where it will be accessible by the kernel at runtime.
> >
> > Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
> > ---
> >  grub-core/kern/efi/mm.c | 36 ++++++++++++++++++++++++++++++++++++
> >  include/grub/efi/efi.h  |  3 +++
> >  2 files changed, 39 insertions(+)
> >
> > diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
> > index fd39d23b4..10ffa2c9b 100644
> > --- a/grub-core/kern/efi/mm.c
> > +++ b/grub-core/kern/efi/mm.c
> > @@ -629,3 +629,39 @@ grub_efi_mm_init (void)
> >    grub_efi_free_pages ((grub_addr_t) memory_map,
> >  		       2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
> >  }
> > +
> > +#if defined (__aarch64__)
> > +grub_err_t
> > +grub_efi_get_ram_base(grub_addr_t *base_addr)
> > +{
> > +  grub_efi_memory_descriptor_t *memory_map;
> > +  grub_efi_memory_descriptor_t *desc;
> 
>      grub_efi_memory_descriptor_t *desc, *memory_map;
> 
> > +  grub_efi_uintn_t mmap_size;
> > +  grub_efi_uintn_t desc_size;
> 
>      grub_efi_uintn_t desc_size, mmap_size;
> 
> > +  int ret;
> > +
> > +  mmap_size = grub_efi_find_mmap_size();
> > +
> > +  memory_map = grub_malloc (mmap_size);
> > +  if (! memory_map)
> > +    return GRUB_ERR_OUT_OF_MEMORY;
> > +  ret = grub_efi_get_memory_map (&mmap_size, memory_map, NULL,
> > +				 &desc_size, NULL);
> > +
> > +  if (ret < 1)
> > +    return GRUB_ERR_BUG;
> > +
> > +  for (desc = memory_map, *base_addr = GRUB_UINT_MAX;
> > +       (grub_addr_t) desc < ((grub_addr_t) memory_map + mmap_size);
> > +       desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
> > +    {
> > +      if (desc->attribute & GRUB_EFI_MEMORY_WB)
>            *base_addr = grub_min (*base_addr, desc->physical_start);
> 
> > +	if (desc->physical_start < *base_addr)
> > +	  *base_addr = desc->physical_start;
> > +    }
> 
> And then you can drop these curly brackets.

Sure, I'll fold these changes into v4.

/
    Leif

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