Hi everyone,
This is ARM PSCI improvements part 2. This series cleans up PSCI stack allocation and target PC storage by introducing a secure stack section and a secure data section.
The series got larger than I planned. Some patches are just moving or consolidating code, and a few are adding missing macros. It's based on v3 of my "sunxi: PSCI implementation rewrite in C" series from earlier.
Patch 1 consolidates the stack setup code from all the PSCI-enabled platforms (which likely originated from the initial sunxi version) into a common function, and moves it into a seperate common function that is called before psci_arch_init. A weak stub psci_arch_init is added for platforms that no longer need a custom version.
Patch 2 converts the remaining sunxi PSCI assembly code into C.
Patch 3 adds the missing CONFIG_ARMV7_PSCI_NR_CPUS=2 for sun7i/A20.
Patch 4 makes the linker page align PSCI text only when it is directly executed, i.e. not copied to CONFIG_ARMV7_SECURE_BASE.
Patch 5 adds a fallback value for CONFIG_ARMV7_PSCI_NR_CPUS. The value is 4, which was the fixed maximum number of stacks allocated.
Patch 6 adds an empty stack section for the secure monitor.
Patch 7 has PSCI allocate its stack in the new secure stack section.
Patch 8 removes the now unused psci_text_end symbol. This was previously used to find where to allocate the stack.
Patch 9 adds a config variable for specifying the maximum size of the secure section (text, data, stack, etc.) and checks if the binary exceeds it.
Patch 10 defines CONFIG_ARMV7_SECURE_MAX_SIZE for sun6i/sun7i (A31/A20), Allwinner SoCs that have a block of secure SRAM.
Patch 11 moves the __secure macro to asm/secure.h. Previously sunxi and i.MX7 were defining it themselves.
Patch 12 adds a secure data section, and a __secure_data macro.
Patch 13 adds helper functions to save and get per-CPU target PC addresses for use in PSCI.
Patch 14 converts all PSCI-enabled platforms to the new helper functions to save/get target PC addresses.
Patch 15 makes the psci_get_cpu_stack_top function local/static. This function should only be used by the stack setup routine.
Regards ChenYu
Chen-Yu Tsai (15): ARM: PSCI: Split out common stack setup code from psci_arch_init sunxi: Move remaining PSCI assembly code to C sunxi: Add missing CONFIG_ARMV7_PSCI_NR_CPUS for sun7i ARM: Page align secure section only when it is executed in situ ARM: PSCI: Add fallback value for CONFIG_ARMV7_PSCI_NR_CPUS ARM: Add an empty secure stack section ARM: PSCI: Allocate PSCI stack in secure stack section ARM: PSCI: Remove unused psci_text_end symbol ARM: Add CONFIG_ARMV7_SECURE_MAX_SIZE and check size of secure section sunxi: Define CONFIG_ARMV7_SECURE_MAX_SIZE for sun6i/sun7i ARM: Move __secure definition to common asm/secure.h ARM: Add secure section for initialized data ARM: PSCI: Add helper functions to access per-CPU target PC storage ARM: PSCI: Switch to per-CPU target PC storage in secure data section ARM: PSCI: Make psci_get_cpu_stack_top local to armv7/psci.S
arch/arm/cpu/armv7/Makefile | 1 + arch/arm/cpu/armv7/ls102xa/psci.S | 26 ++++---------- arch/arm/cpu/armv7/mx7/psci-mx7.c | 2 +- arch/arm/cpu/armv7/mx7/psci.S | 31 +++++------------ arch/arm/cpu/armv7/nonsec_virt.S | 7 +++- arch/arm/cpu/armv7/psci-common.c | 39 +++++++++++++++++++++ arch/arm/cpu/armv7/psci.S | 55 ++++++++++++++++++++++-------- arch/arm/cpu/armv7/sunxi/Makefile | 1 - arch/arm/cpu/armv7/sunxi/psci.c | 9 +++-- arch/arm/cpu/armv7/sunxi/psci_head.S | 66 ------------------------------------ arch/arm/cpu/u-boot.lds | 60 +++++++++++++++++++++++++------- arch/arm/include/asm/armv7.h | 2 ++ arch/arm/include/asm/config.h | 5 +++ arch/arm/include/asm/psci.h | 9 ++++- arch/arm/include/asm/secure.h | 3 ++ arch/arm/lib/sections.c | 2 ++ arch/arm/mach-tegra/psci.S | 16 ++++----- include/configs/sun6i.h | 1 + include/configs/sun7i.h | 2 ++ 19 files changed, 183 insertions(+), 154 deletions(-) create mode 100644 arch/arm/cpu/armv7/psci-common.c delete mode 100644 arch/arm/cpu/armv7/sunxi/psci_head.S