diff options
Diffstat (limited to 'security/tf_driver/tf_comm.h')
| -rw-r--r-- | security/tf_driver/tf_comm.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/security/tf_driver/tf_comm.h b/security/tf_driver/tf_comm.h new file mode 100644 index 000000000000..8921dc1d1be0 --- /dev/null +++ b/security/tf_driver/tf_comm.h @@ -0,0 +1,202 @@ +/** + * Copyright (c) 2011 Trusted Logic S.A. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef __TF_COMM_H__ +#define __TF_COMM_H__ + +#include "tf_defs.h" +#include "tf_protocol.h" + +/*---------------------------------------------------------------------------- + * Misc + *----------------------------------------------------------------------------*/ + +void tf_set_current_time(struct tf_comm *comm); + +/* + * Atomic accesses to 32-bit variables in the L1 Shared buffer + */ +static inline u32 tf_read_reg32(const u32 *comm_buffer) +{ + u32 result; + + __asm__ __volatile__("@ tf_read_reg32\n" + "ldrex %0, [%1]\n" + : "=&r" (result) + : "r" (comm_buffer) + ); + + return result; +} + +static inline void tf_write_reg32(void *comm_buffer, u32 value) +{ + u32 tmp; + + __asm__ __volatile__("@ tf_write_reg32\n" + "1: ldrex %0, [%2]\n" + " strex %0, %1, [%2]\n" + " teq %0, #0\n" + " bne 1b" + : "=&r" (tmp) + : "r" (value), "r" (comm_buffer) + : "cc" + ); +} + +/* + * Atomic accesses to 64-bit variables in the L1 Shared buffer + */ +static inline u64 tf_read_reg64(void *comm_buffer) +{ + u64 result; + + __asm__ __volatile__("@ tf_read_reg64\n" + "ldrexd %0, [%1]\n" + : "=&r" (result) + : "r" (comm_buffer) + ); + + return result; +} + +static inline void tf_write_reg64(void *comm_buffer, u64 value) +{ + u64 tmp; + + __asm__ __volatile__("@ tf_write_reg64\n" + "1: ldrexd %0, [%2]\n" + " strexd %0, %1, [%2]\n" + " teq %0, #0\n" + " bne 1b" + : "=&r" (tmp) + : "r" (value), "r" (comm_buffer) + : "cc" + ); +} + +/*---------------------------------------------------------------------------- + * SMC operations + *----------------------------------------------------------------------------*/ + +/* RPC return values */ +#define RPC_NO 0x00 /* No RPC to execute */ +#define RPC_YIELD 0x01 /* Yield RPC */ +#define RPC_NON_YIELD 0x02 /* non-Yield RPC */ + +int tf_rpc_execute(struct tf_comm *comm); + +/*---------------------------------------------------------------------------- + * Shared memory related operations + *----------------------------------------------------------------------------*/ + +#define L1_DESCRIPTOR_FAULT (0x00000000) +#define L2_DESCRIPTOR_FAULT (0x00000000) + +#define L2_DESCRIPTOR_ADDR_MASK (0xFFFFF000) + +#define DESCRIPTOR_V13_12_MASK (0x3 << PAGE_SHIFT) +#define DESCRIPTOR_V13_12_GET(a) ((a & DESCRIPTOR_V13_12_MASK) >> PAGE_SHIFT) + +struct tf_coarse_page_table *tf_alloc_coarse_page_table( + struct tf_coarse_page_table_allocation_context *alloc_context, + u32 type); + +void tf_free_coarse_page_table( + struct tf_coarse_page_table_allocation_context *alloc_context, + struct tf_coarse_page_table *coarse_pg_table, + int force); + +void tf_init_coarse_page_table_allocator( + struct tf_coarse_page_table_allocation_context *alloc_context); + +void tf_release_coarse_page_table_allocator( + struct tf_coarse_page_table_allocation_context *alloc_context); + +struct page *tf_l2_page_descriptor_to_page(u32 l2_page_descriptor); + +u32 tf_get_l2_descriptor_common(u32 vaddr, struct mm_struct *mm); + +void tf_cleanup_shared_memory( + struct tf_coarse_page_table_allocation_context *alloc_context, + struct tf_shmem_desc *shmem_desc, + u32 full_cleanup); + +int tf_fill_descriptor_table( + struct tf_coarse_page_table_allocation_context *alloc_context, + struct tf_shmem_desc *shmem_desc, + u32 buffer, + struct vm_area_struct **vmas, + u32 descriptors[TF_MAX_COARSE_PAGES], + u32 buffer_size, + u32 *buffer_start_offset, + bool in_user_space, + u32 flags, + u32 *descriptor_count); + +/*---------------------------------------------------------------------------- + * Standard communication operations + *----------------------------------------------------------------------------*/ + +int tf_schedule_secure_world(struct tf_comm *comm); + +int tf_send_receive( + struct tf_comm *comm, + union tf_command *command, + union tf_answer *answer, + struct tf_connection *connection, + bool bKillable); + + +/** + * get a pointer to the secure world description. + * This points directly into the L1 shared buffer + * and is valid only once the communication has + * been initialized + **/ +u8 *tf_get_description(struct tf_comm *comm); + +/*---------------------------------------------------------------------------- + * Power management + *----------------------------------------------------------------------------*/ + +enum TF_POWER_OPERATION { + TF_POWER_OPERATION_HIBERNATE = 1, + TF_POWER_OPERATION_SHUTDOWN = 2, + TF_POWER_OPERATION_RESUME = 3, +}; + +int tf_pm_hibernate(struct tf_comm *comm); +int tf_pm_resume(struct tf_comm *comm); +int tf_pm_shutdown(struct tf_comm *comm); + +int tf_power_management(struct tf_comm *comm, + enum TF_POWER_OPERATION operation); + + +/*---------------------------------------------------------------------------- + * Communication initialization and termination + *----------------------------------------------------------------------------*/ + +int tf_init(struct tf_comm *comm); + +void tf_terminate(struct tf_comm *comm); + + +#endif /* __TF_COMM_H__ */ |