1/* 2 * Copyright (c) 2014, STMicroelectronics International N.V. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <asm.S> 29#include <arm.h> 30#include <arm32_macros.S> 31#include <kernel/unwind.h> 32 33/* Let platforms override this if needed */ 34.weak get_core_pos_mpidr 35 36/* size_t get_core_pos(void); */ 37FUNC get_core_pos , : 38UNWIND( .fnstart) 39 read_mpidr r0 40 b get_core_pos_mpidr 41UNWIND( .fnend) 42END_FUNC get_core_pos 43 44/* size_t get_core_pos_mpidr(uint32_t mpidr); */ 45FUNC get_core_pos_mpidr , : 46UNWIND( .fnstart) 47 /* Calculate CorePos = (ClusterId * 4) + CoreId */ 48 and r1, r0, #MPIDR_CPU_MASK 49 and r0, r0, #MPIDR_CLUSTER_MASK 50 add r0, r1, r0, LSR #6 51 bx lr 52UNWIND( .fnend) 53END_FUNC get_core_pos_mpidr 54 55/* 56 * uint32_t temp_set_mode(int cpu_mode) 57 * returns cpsr to be set 58 */ 59LOCAL_FUNC temp_set_mode , : 60UNWIND( .fnstart) 61 mov r1, r0 62 cmp r1, #CPSR_MODE_USR /* update mode: usr -> sys */ 63 moveq r1, #CPSR_MODE_SYS 64 cpsid aif /* disable interrupts */ 65 mrs r0, cpsr /* get cpsr with disabled its*/ 66 bic r0, #CPSR_MODE_MASK /* clear mode */ 67 orr r0, r1 /* set expected mode */ 68 bx lr 69UNWIND( .fnend) 70END_FUNC temp_set_mode 71 72/* uint32_t read_mode_sp(int cpu_mode) */ 73FUNC read_mode_sp , : 74UNWIND( .fnstart) 75 push {r4, lr} 76UNWIND( .save {r4, lr}) 77 mrs r4, cpsr /* save cpsr */ 78 bl temp_set_mode 79 msr cpsr, r0 /* set the new mode */ 80 mov r0, sp /* get the function result */ 81 msr cpsr, r4 /* back to the old mode */ 82 pop {r4, pc} 83UNWIND( .fnend) 84END_FUNC read_mode_sp 85 86/* uint32_t read_mode_lr(int cpu_mode) */ 87FUNC read_mode_lr , : 88UNWIND( .fnstart) 89 push {r4, lr} 90UNWIND( .save {r4, lr}) 91 mrs r4, cpsr /* save cpsr */ 92 bl temp_set_mode 93 msr cpsr, r0 /* set the new mode */ 94 mov r0, lr /* get the function result */ 95 msr cpsr, r4 /* back to the old mode */ 96 pop {r4, pc} 97UNWIND( .fnend) 98END_FUNC read_mode_lr 99