| kchik@codeaurora.org | bce18ea | 2011-04-18 20:22:28 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| 2 | |
| 3 | * Redistribution and use in source and binary forms, with or without |
| 4 | * modification, are permitted provided that the following conditions are |
| 5 | * met: |
| 6 | * * Redistributions of source code must retain the above copyright |
| 7 | * notice, this list of conditions and the following disclaimer. |
| 8 | * * Redistributions in binary form must reproduce the above |
| 9 | * copyright notice, this list of conditions and the following |
| 10 | * disclaimer in the documentation and/or other materials provided |
| 11 | * with the distribution. |
| 12 | * * Neither the name of Code Aurora Forum, Inc. nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 23 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 25 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| 26 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include "scm_decrypt.h" |
| 30 | |
| 31 | #pragma GCC optimize ("O0") |
| 32 | |
| 33 | /* From Linux Kernel asm/system.h */ |
| 34 | #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" |
| 35 | |
| 36 | void setup_decrypt_cmd ( decrypt_img_req* dec_cmd, |
| 37 | uint32_t** img_ptr, |
| 38 | uint32_t* img_len_ptr) |
| 39 | { |
| 40 | dec_cmd->common_req.len = sizeof(decrypt_img_req); |
| 41 | dec_cmd->common_req.buf_offset = sizeof(scm_command); |
| 42 | dec_cmd->common_req.resp_hdr_offset = 0; |
| 43 | dec_cmd->common_req.id = SSD_DECRYPT_IMG_ID; |
| 44 | |
| 45 | dec_cmd->img_ptr = img_ptr; |
| 46 | dec_cmd->img_len_ptr = img_len_ptr; |
| 47 | } |
| 48 | |
| 49 | static uint32_t smc(uint32_t cmd_addr) |
| 50 | { |
| 51 | uint32_t context_id; |
| 52 | register uint32_t r0 __asm__("r0") = 1; |
| 53 | register uint32_t r1 __asm__("r1") = (uint32_t)&context_id; |
| 54 | register uint32_t r2 __asm__("r2") = cmd_addr; |
| 55 | __asm__( |
| 56 | "1:smc #0 @ switch to secure world\n" |
| 57 | "cmp r0, #1 \n" |
| 58 | "beq 1b \n" |
| 59 | : "=r" (r0) |
| 60 | : "r" (r0), "r" (r1), "r" (r2) |
| 61 | : "r3", "cc"); |
| 62 | return r0; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | int decrypt_img_scm(uint32_t** img_ptr, uint32_t* img_len_ptr) |
| 67 | { |
| 68 | int ret = 0; |
| 69 | decrypt_img_req *decrypt_cmd; |
| 70 | |
| 71 | /* allocate memory for the command structure */ |
| 72 | /* NEEDS TO BE CONTIGUOUS MEMORY */ |
| 73 | decrypt_cmd = malloc(sizeof(decrypt_img_req)); |
| 74 | |
| 75 | /* setup the command for decryption */ |
| 76 | setup_decrypt_cmd(decrypt_cmd, img_ptr, img_len_ptr); |
| 77 | |
| 78 | ret = smc(decrypt_cmd); |
| 79 | free(decrypt_cmd); |
| 80 | return ret; |
| 81 | } |
| 82 | |