u-boot/arch/arm/mach-sunxi/rmr_switch.S
Andre Przywara 83843c9b3a sunxi: A64: do an RMR switch if started in AArch32 mode
The Allwinner A64 SoC starts execution in AArch32 mode, and both
the boot ROM and Allwinner's boot0 keep running in this mode.
So U-Boot gets entered in 32-bit, although we want it to run in AArch64.

By using a "magic" instruction, which happens to be an almost-NOP in
AArch64 and a branch in AArch32, we differentiate between being
entered in 64-bit or 32-bit mode.
If in 64-bit mode, we proceed with the branch to reset, but in 32-bit
mode we trigger an RMR write to bring the core into AArch64/EL3 and
re-enter U-Boot at CONFIG_SYS_TEXT_BASE.
This allows a 64-bit U-Boot to be both entered in 32 and 64-bit mode,
so we can use the same start code for the SPL and the U-Boot proper.

We use the existing custom header (boot0.h) functionality, but restrict
the existing boot0 header reservation to the non-SPL build now. A SPL
wouldn't need such header anyway. This allows to have both options
defined and lets us use one for the SPL and the other for U-Boot proper.

Also add arch/arm/mach-sunxi/rmr_switch.S, which contains the original
ARM assembly code and instructions how to re-generate the encoded
version.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
2017-01-04 16:37:42 +01:00

41 lines
1.6 KiB
ArmAsm

@
@ ARMv8 RMR reset sequence on Allwinner SoCs.
@
@ All 64-bit capable Allwinner SoCs reset in AArch32 (and continue to
@ exectute the Boot ROM in this state), so we need to switch to AArch64
@ at some point.
@ Section G6.2.133 of the ARMv8 ARM describes the Reset Management Register
@ (RMR), which triggers a warm-reset of a core and can request to switch
@ into a different execution state (AArch32 or AArch64).
@ The address at which execution starts after the reset is held in the
@ RVBAR system register, which is architecturally read-only.
@ Allwinner provides a writable alias of this register in MMIO space, so
@ we can easily set the start address of AArch64 code.
@ This code below switches to AArch64 and starts execution at the specified
@ start address. It needs to be assembled by an ARM(32) assembler and
@ the machine code must be inserted as verbatim .word statements into the
@ beginning of the AArch64 U-Boot code.
@ To get the encoded bytes, use:
@ ${CROSS_COMPILE}gcc -c -o rmr_switch.o rmr_switch.S
@ ${CROSS_COMPILE}objdump -d rmr_switch.o
@
@ The resulting words should be inserted into the U-Boot file at
@ arch/arm/include/asm/arch-sunxi/boot0.h.
@
@ This file is not build by the U-Boot build system, but provided only as a
@ reference and to be able to regenerate a (probably fixed) version of this
@ code found in encoded form in boot0.h.
.text
ldr r1, =0x017000a0 @ MMIO mapped RVBAR[0] register
ldr r0, =0x57aA7add @ start address, to be replaced
str r0, [r1]
dsb sy
isb sy
mrc 15, 0, r0, cr12, cr0, 2 @ read RMR register
orr r0, r0, #3 @ request reset in AArch64
mcr 15, 0, r0, cr12, cr0, 2 @ write RMR register
isb sy
1: wfi
b 1b