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>

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 39f7071..8487221 100644 (file)
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -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