Hi Alison,
On 10 November 2016 at 02:49, Alison Wang b18965@freescale.com wrote:
This series is to support loading a 32-bit OS, the execution state will change from AArch64 to AArch32 when jumping to kernel. The architecture information will be got through checking FIT image, then U-Boot will load 32-bit OS or 64-bit OS automatically.
Spin-table method is used for secondary cores to load 32-bit OS. The architecture information will be got through checking FIT image and saved in the os_arch element of spin-table, then the secondary cores will check os_arch and jump to 32-bit OS or 64-bit OS automatically.
PSCI method can also be used for secondary cores to load 32-bit OS. As PSCI and secure monitor firmware framework are enabled, loading 32-bit OS is supported in such case. The default target exception level returned to U-Boot is EL2, so the corresponding work to switch to AArch32 EL2 and jump to 32-bit OS are done in U-Boot and secure firmware together.
Changes in v8:
- Fix the issue when U-Boot is running in EL2 or EL1.
Thanks for sticking with this. Great news: it works for my setup.
I tested booting an arm64 kernel on FVP Foundation and AEMv8 modes and on Juno R0, R1 and R2. I also tested and Versatile Express TC2 can still load it's Aarch32 kernel.
I didn't test running an Aarch32 kernel or any of the new functionality on my ARMv8 platforms.
But I checked and the patches are bisect-able on my ARMv8 platforms.
Tested-by: Ryan Harkin ryan.harkin@linaro.org
- Support loading 32-bit OS with PSCI enabled.
Changes in v7:
- Move the call for armv8_switch_to_el2_m into the first patch.
Changes in v6:
- Modified armv8_switch_to_el1(). It will always jump to ep when switching to AArch64 or AArch32 modes.
- Make other platforms compatible with the new armv8_switch_to_el2() and armv8_switch_to_el1().
- Make secondary_switch_to_el1() always jump to ep when switching to AArch64 or AArch32 modes.
Changes in v5:
- Modified armv8_switch_to_el2(). It will always jump to ep when switching to AArch64 or AArch32 modes.
- Make secondary_switch_to_el2() always jump to ep when switching to AArch64 or AArch32 modes.
Changes in v4:
- Correct config ARM64_SUPPORT_AARCH32.
- Omit arch and ftaddr arguments.
- Rename "xreg5" to "tmp".
- Use xxx_RES1 to combine all RES1 fields in xxx register.
- Use an immediate cmp directly.
- Use #ifdef for CONFIG_ARM64_SUPPORT_AARCH32.
Changes in v3:
- Comments the functions and the arguments.
- Rename the real parameters.
- Use the macros instead of the magic values.
- Remove the redundant codes.
- Clean up all of the mess in boot_jump_linux().
- Add CONFIG_ARM64_SUPPORT_AARCH32 to detect for some ARM64 system doesn't support AArch32 state.
- Adjust the arguments for armv8_switch_to_el2_m and armv8_switch_to_el1_m.
Changes in v2:
- armv8_switch_to_el2_aarch32() is removed. armv8_switch_to_el2_m is used to switch to AArch64 EL2 or AArch32 Hyp.
- armv8_switch_to_el1_aarch32() is removed. armv8_switch_to_el1_m is used to switch to AArch64 EL1 or AArch32 SVC.
- Support to call armv8_switch_to_el2_m and armv8_switch_to_el1_m.
Alison Wang (3): armv8: Support loading 32-bit OS in AArch32 execution state armv8: fsl-layerscape: SMP support for loading 32-bit OS armv8: fsl-layerscape: Support loading 32-bit OS with PSCI enabled
arch/arm/Kconfig | 6 ++++ arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S | 61 +++++++++++++++++++++++++------ arch/arm/cpu/armv8/fsl-layerscape/mp.c | 10 ++++++ arch/arm/cpu/armv8/sec_firmware_asm.S | 23 ++++++++++++ arch/arm/cpu/armv8/start.S | 8 +++++ arch/arm/cpu/armv8/transition.S | 35 ++++++++++++++---- arch/arm/include/asm/arch-fsl-layerscape/mp.h | 6 ++++ arch/arm/include/asm/macro.h | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------- arch/arm/include/asm/system.h | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- arch/arm/lib/bootm.c | 45 ++++++++++++++++++++--- arch/arm/mach-rmobile/lowlevel_init_gen3.S | 9 ++++- common/image-fit.c | 19 +++++++++- 12 files changed, 451 insertions(+), 68 deletions(-)