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說明: 在默認的情況下，本文講述的是armv8 aarch64體系，optee 3.12.0代碼

默認開啟了CFG_CORE_RESERVED_SHM

編譯的時候在section段中預留一塊內存做為共享內存

#ifdef CFG_CORE_RESERVED_SHM
register_phys_mem(MEM_AREA_NSEC_SHM, TEE_SHMEM_START, TEE_SHMEM_SIZE);
#endif

內存的類型為：MEM_AREA_NSEC_SHM
內存的大小在platform_config.h中定義
#define TEE_SHMEM_START (TZDRAM_BASE + TZDRAM_SIZE)
#define TEE_SHMEM_SIZE 0x100000

在optee early_init的時候，將共享內存地址和size保存到全局變量中

#ifdef CFG_CORE_RESERVED_SHM static TEE_Result teecore_init_pub_ram(void) {vaddr_t s = 0;vaddr_t e = 0;/* get virtual addr/size of NSec shared mem allocated from teecore */core_mmu_get_mem_by_type(MEM_AREA_NSEC_SHM, &s, &e);if (s >= e || s & SMALL_PAGE_MASK || e & SMALL_PAGE_MASK)panic("invalid PUB RAM");/* extra check: we could rely on core_mmu_get_mem_by_type() */if (!tee_vbuf_is_non_sec(s, e - s))panic("PUB RAM is not non-secure");#ifdef CFG_PL310/* Allocate statically the l2cc mutex */tee_l2cc_store_mutex_boot_pa(virt_to_phys((void *)s));s += sizeof(uint32_t); /* size of a pl310 mutex */s = ROUNDUP(s, SMALL_PAGE_SIZE); /* keep required alignment */ #endifdefault_nsec_shm_paddr = virt_to_phys((void *)s);default_nsec_shm_size = e - s;return TEE_SUCCESS; } early_init(teecore_init_pub_ram); #endif /*CFG_CORE_RESERVED_SHM*/

在Linux Kernel tee-driver加載的時候，會請求TEE服務，獲取共享內存的地址和size，然后在Linux Kernel中進行remap

#ifdef CFG_CORE_RESERVED_SHM static void tee_entry_get_shm_config(struct thread_smc_args *args) {args->a0 = OPTEE_SMC_RETURN_OK;args->a1 = default_nsec_shm_paddr;args->a2 = default_nsec_shm_size;/* Should this be TEESMC cache attributes instead? */args->a3 = core_mmu_is_shm_cached(); } #endif

總結

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