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efi_loader: fix memory allocation on sandbox

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Commit 7b78d6438a2b ("efi_loader: Reserve unaccessible memory") introduced
a comparison between RAM top and RAM start that was not known at the time
when the patch of commit 49759743bf09 ("efi_loader: eliminate sandbox
addresses") was written.

The sandbox uses an address space that is only relevant in the sandbox
context. We have to map ram_top from the sandbox address space to the
physical address space before using it in the EFI subsystem.

Fixes: 49759743bf09 ("efi_loader: eliminate sandbox addresses")
Fixes: 7b78d6438a2b ("efi_loader: Reserve unaccessible memory")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2019-01-05 23:41:36 +01:00 committed by Alexander Graf
parent 0ea8741ff6
commit 23f5f4abf7
1 changed files with 6 additions and 0 deletions
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6
lib/efi_loader/efi_memory.c
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@ -554,6 +554,12 @@ __weak void efi_add_known_memory(void)
u64 ram_top = board_get_usable_ram_top(0) & ~EFI_PAGE_MASK;
int i;
/*
* ram_top is just outside mapped memory. So use an offset of one for
* mapping the sandbox address.
*/
ram_top = (uintptr_t)map_sysmem(ram_top - 1, 0) + 1;
/* Fix for 32bit targets with ram_top at 4G */
if (!ram_top)
ram_top = 0x100000000ULL;