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efi/arm: Pass start and end addresses to cache_clean_flush() 

In preparation for turning the decompressor's cache clean/flush
operations into proper by-VA maintenance for v7 cores, pass the
start and end addresses of the regions that need cache maintenance
into cache_clean_flush in registers r0 and r1.

Currently, all implementations of cache_clean_flush ignore these
values, so no functional change is expected as a result of this
patch.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-02-19 00:09:48 +01:00
parent c7225494be
commit e951a1f427
1 changed files with 6 additions and 0 deletions
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6
arch/arm/boot/compressed/head.S
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@ -1460,6 +1460,12 @@ ENTRY(efi_stub_entry)
@ Preserve return value of efi_entry() in r4
mov r4, r0
add r1, r4, #SZ_2M @ DT end
bl cache_clean_flush
ldr r0, [sp] @ relocated zImage
ldr r1, =_edata @ size of zImage
add r1, r1, r0 @ end of zImage
bl cache_clean_flush
@ The PE/COFF loader might not have cleaned the code we are