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efi_loader: Add bounce buffer support

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Some hardware that is supported by U-Boot can not handle DMA above 32bits.
For these systems, we need to come up with a way to expose the disk interface
in a safe way.

This patch implements EFI specific bounce buffers. For non-EFI cases, this
apparently was no issue so far, since we can just define our environment
variables conveniently.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf
2016-05-11 18:25:48 +02:00
committed by Tom Rini
parent 851bda8148
commit 51735ae0ea
4 changed files with 91 additions and 9 deletions
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16
lib/efi_loader/efi_memory.c
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@ -27,6 +27,10 @@ struct efi_mem_list {
/* This list contains all memory map items */
LIST_HEAD(efi_mem);
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
void *efi_bounce_buffer;
#endif
/*
* Sorts the memory list from highest address to lowest address
*
@ -349,5 +353,17 @@ int efi_memory_init(void)
efi_add_memory_map(runtime_start, runtime_pages,
EFI_RUNTIME_SERVICES_CODE, false);
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
/* Request a 32bit 64MB bounce buffer region */
uint64_t efi_bounce_buffer_addr = 0xffffffff;
if (efi_allocate_pages(1, EFI_LOADER_DATA,
(64 * 1024 * 1024) >> EFI_PAGE_SHIFT,
&efi_bounce_buffer_addr) != EFI_SUCCESS)
return -1;
efi_bounce_buffer = (void*)(uintptr_t)efi_bounce_buffer_addr;
#endif
return 0;
}