On Wed, Jul 31, 2013 at 09:58:20AM +0100, Matt Fleming wrote:
> On 07/30/2013 05:47 PM, Leif Lindholm wrote:
> > efi_lookup_mapped_addr() is a handy utility for other platforms
> > than x86. Move it from arch/x86 to drivers/firmware/efi.
> >
> > This function will be used by future ARM patches.
> >
> > Signed-off-by: Leif Lindholm <leif.lindh...@linaro.org>
> > ---
> > arch/x86/platform/efi/efi.c | 28 ----------------------------
> > drivers/firmware/efi/efi.c | 30 ++++++++++++++++++++++++++++++
> > 2 files changed, 30 insertions(+), 28 deletions(-)
> >
>
> [...]
>
> > +#if defined(CONFIG_X86)
> > +/*
> > + * We can't ioremap data in EFI boot services RAM, because we've already
> > mapped
> > + * it as RAM. So, look it up in the existing EFI memory map instead. Only
> > + * callable after efi_enter_virtual_mode and before efi_free_boot_services.
> > + */
> > +void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
> > +{
> > + void *p;
> > + if (WARN_ON(!memmap.map))
> > + return NULL;
> > + for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> > + efi_memory_desc_t *md = p;
> > + u64 size = md->num_pages << EFI_PAGE_SHIFT;
> > + u64 end = md->phys_addr + size;
> > + if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
> > + md->type != EFI_BOOT_SERVICES_CODE &&
> > + md->type != EFI_BOOT_SERVICES_DATA)
> > + continue;
> > + if (!md->virt_addr)
> > + continue;
> > + if (phys_addr >= md->phys_addr && phys_addr < end) {
> > + phys_addr += md->virt_addr - md->phys_addr;
> > + return (__force void __iomem *)(unsigned long)phys_addr;
> > + }
> > + }
> > + return NULL;
> > +}
> > +#endif
> > +
>
> If we hang a 'struct efi_memory_map' off of 'struct efi', can we get rid
> of this #ifdef?
Sure.
It would just be a small bit of wasted memory for IA64 (struct +
code). On the flip side, having that on all platforms could lend
itself to making a little bit more code common.
Tony?
/
Leif
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