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LCU14 302- How to port OP-TEE to another platform

Linaro
Linaro

LCU14 302- How to port OP-TEE to another platform --------------------------------------------------- Speaker: Joakim Bech, Jens Wiklander and Pascal Brand Date: September 17, 2014 --------------------------------------------------- ★ Session Summary ★ OP-TEE (Open Portable Trusted Execution Environment) is the source code for the TEE in Linux using the ARM Trustzone technology. This component meets the Global Platform TEE System Architecture specification. Most of the code is generic. However, a number of platform specific characteristics are addressed, such as memory layout or board specific hardware IP. In this session, you can learn the steps to follow to port OP-TEE for your armv7 platform, as the ones that have been defined when porting OP-TEE to A80 (SWG-77). OP-TEE to the Allwinner A80 platform --------------------------------------------------- ★ Resources ★ Zerista: http://lcu14.zerista.com/event/member/137748 Google Event: https://plus.google.com/u/0/events/cnd044lmnid6jcoj1a9svlhmkj0 Video: https://www.youtube.com/watch?v=QgaGJow7hws&list=UUIVqQKxCyQLJS6xvSmfndLA Etherpad: http://pad.linaro.org/p/lcu14-302 --------------------------------------------------- ★ Event Details ★ Linaro Connect USA - #LCU14 September 15-19th, 2014 Hyatt Regency San Francisco Airport --------------------------------------------------- http://www.linaro.org http://connect.linaro.org

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LCU14-302: How to port OP-TEE to another 
platform 
Sun Yan bang and Joakim Bech, LCU14 
LCU14 BURLINGAME
A80 Overview
Optimus board Overview
Getting started with OP-TEE 
● Get OP-TEE source code 
http://github.com/OP-TEE 
● Get the toolchain 
http://releases.linaro.org/14.05/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.9-2014.05_linux.tar.xz
How to build OP-TEE 
● Add toolchain path 
export PATH=path-to-toolchain-bin:$PATH 
● Define CROSS_PREFIX macro 
export CROSS_PREFIX=arm-linux-gnueabihf 
● Choose target platform 
export PLATFORM=sunxi #default is orly2 
● Build OP-TEE 
make
A80 eMMC Partition Map
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LCU14 302- How to port OP-TEE to another platform

  • 1. LCU14-302: How to port OP-TEE to another platform Sun Yan bang and Joakim Bech, LCU14 LCU14 BURLINGAME
  • 4. Getting started with OP-TEE ● Get OP-TEE source code http://github.com/OP-TEE ● Get the toolchain http://releases.linaro.org/14.05/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.9-2014.05_linux.tar.xz
  • 5. How to build OP-TEE ● Add toolchain path export PATH=path-to-toolchain-bin:$PATH ● Define CROSS_PREFIX macro export CROSS_PREFIX=arm-linux-gnueabihf ● Choose target platform export PLATFORM=sunxi #default is orly2 ● Build OP-TEE make
  • 7. OP-TEE Trusted OS OP-TEE Main Blocks Linux Android TEE Client API TEE Client TEE Driver Client Application Client Application TEE Internal API TEE Core TEE functions (crypto/mm) Trusted Application Trusted Application HAL SMC TrustZone based chipset crypto timer efuse porting
  • 8. OP-TEE Porting - Affected Gits ● OP-TEE Trusted OS (optee_os) Add new platform support (plat-sunxi) ● OP-TEE Linux kernel driver (optee_linuxdriver) No changes needed for the ARMv7-A platform ● OP-TEE Normal World user space (optee_client) No changes needed for the ARMv7-A platform
  • 9. OP-TEE Porting - Cloning a New Platform ● Cloned plat-sunxi from plat-orly2 plat-sunxi/ ├── conf.mk ├── core_bootcfg.c ├── core_chip.c ├── link.mk ├── main.c ├── sub.mk ├── system_config.in ├── tz_sinit.S └── tz-template.lds
  • 10. OP-TEE Porting - Compiler & Linker options ● Compiler options: conf.mk CROSS_PREFIX ?= armv7-linux CROSS_COMPILE ?= $(CROSS_PREFIX)- platform-cpuarch = cortex-a7 #orly2 is cortex-a9 ● Linker options: link.mk link-out-dir = $(out-dir)/core/ link-script = $(platform-dir)/tz-template.lds link-ldflags = $(LDFLAGS) ● Linker script file: tz-template.lds MEMORY { /* 1 MByte is allocated for teecore execution */ EXEC_MEM (rw) : ORIGIN = (%in_TEE_SCATTER_START% + 0x00000000), LENGTH = 0x000D0000 STACKS_MEM (rw) : ORIGIN = (%in_TEE_SCATTER_START% + 0x000D0000), LENGTH = 0x00010000 CTX_MEM (rw) : ORIGIN = (%in_TEE_SCATTER_START% + 0x000E0000), LENGTH = 0x00010000 MMU_MEM (rw) : ORIGIN = (%in_TEE_SCATTER_START% + 0x000F0000), LENGTH = 0x00010000 }
  • 11. OP-TEE Porting - Platform Configuration ● Platform specific configuration: system_config.in # DDR address DDR_PHYS_START := 0x20000000 DDR_SIZE := 0x20000000 # Static configuration of DDR reserved to TEE/TZ CFG_DDR_TEETZ_RESERVED_START ?= 0x9e000000 CFG_DDR_TEETZ_RESERVED_SIZE ?= 0x02000000 TEE_SCATTER_START := $(CFG_DDR_TEETZ_RESERVED_START) # Hard coded NB cores CFG_TEE_CORE_NB_CORE := 4 # Stack size configuration STACK_TMP_SIZE := 1024 STACK_ABT_SIZE := 1024 STACK_THREAD_SIZE := 8192
  • 12. OP-TEE Porting - Platform Configuration ● platform_config.h ● PLATFORM_FLAVOR - Similar SoC but different versions? ● GIC base ● UART ● Stack sizes (tmp, abt, thread etc) ● Will replace “system_config.in” in the near future
  • 13. OP-TEE Porting - Memory Map
  • 14. OP-TEE Porting - Memory Configuration ● plat-sunxi/ core_bootconfig.c
  • 15. OP-TEE Porting - Platform Initialization 1. tz_sinit (tz_sinit.S ) a. CPU basic initialization b. Cache/MMU Initialization c. init BSS d. Jump to main_init 2. main_init (main.c) a. Initialization thread stacks b. Register handlers (stdcall/fiq/svc/abort) c. Return to non-secure entry
  • 16. OP-TEE Running and debug 4. sm_smc_entry (sm_asm.S) a. Save caller world context b. Restore world context c. Update SCR bits(NS/FIQ) 5. Thread handle (thread_asm.S, thread.c) a. Check if fiq handle request b. Thread allocate c. Thread context restore 6. main_tee_entry (main.c) 7. tee_entry (entry.c)
  • 17. OP-TEE documentation ● OP-TEE Introduction LCA14-502: The Way To a Generic TrustZone Solution http://www.slideshare.net/linaroorg/lca14-502-thewaytoagenerictrustzonesolution ● OP-TEE OS Documents https://github.com/OP-TEE/optee_os/tree/master/documentation https://github.com/jbech-linaro/optee_os/tree/trusted_os_docs/documentation (*) ● Linaro Blog - “OP-TEE, open-source security for the mass-market” https://www.linaro.org/blog/core-dump/op-tee-open-source-security-mass-market (*) Not completed and should be put in the official OP-TEE Git.
  • 18. More about Linaro Connect: connect.linaro.org Linaro members: www.linaro.org/members More about Linaro: www.linaro.org/about/