[bootwrapper PATCH v3 07/15] aarch64: add mov_64 macro

[Mark Rutland]

In subsequent patches we'll need to load 64-bit values into GPRs before
the CPU is in a known endianness, where we cannot use literal pools.

In preparation for that, this patch adds a new `mov_64` macro to load a
64-bit value into a GPR using a sequence of MOV and MOVKs, which will
function the same regardless of the CPU's endianness.

At the same time, move the `cpuid` macro to use `mov_64` internally.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Reviewed-by: Andre Przywara <andre.przywara at arm.com>
---
 arch/aarch64/common.S | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/aarch64/common.S b/arch/aarch64/common.S
index c7171a9..3279fa9 100644
--- a/arch/aarch64/common.S
+++ b/arch/aarch64/common.S
@@ -9,9 +9,17 @@
 
 #include <cpu.h>
 
+	/* Load a 64-bit value using immediates */
+	.macro	mov_64 dest, val
+	mov	\dest, #(((\val) >>  0) & 0xffff)
+	movk	\dest, #(((\val) >> 16) & 0xffff), lsl #16
+	movk	\dest, #(((\val) >> 32) & 0xffff), lsl #32
+	movk	\dest, #(((\val) >> 48) & 0xffff), lsl #48
+	.endm
+
 	/* Put MPIDR into \dest, clobber \tmp and flags */
 	.macro cpuid dest, tmp
 	mrs	\dest, mpidr_el1
-	ldr	\tmp, =MPIDR_ID_BITS
+	mov_64	\tmp, MPIDR_ID_BITS
 	ands	\dest, \dest, \tmp
 	.endm
-- 
2.30.2