projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 58e92b39 AB |
1 | //\r |
| 2 | // Copyright (c) 2012-2014, ARM Limited. All rights reserved.\r | |
| de656e66 | 3 | // Copyright (c) 2014-2016, Linaro Limited. All rights reserved.\r |
| 58e92b39 | 4 | //\r |
| 4059386c | 5 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 58e92b39 AB |
6 | //\r |
| 7 | //\r | |
| 8 | \r | |
| d63ed30b | 9 | #include <AsmMacroIoLib.h>\r |
| 58e92b39 | 10 | \r |
| de656e66 | 11 | .arch_extension virt\r |
| 58e92b39 | 12 | \r |
| de656e66 | 13 | ASM_FUNC(ArmCallHvc)\r |
| 58e92b39 AB |
14 | push {r4-r8}\r |
| 15 | // r0 will be popped just after the HVC call\r | |
| 16 | push {r0}\r | |
| 17 | \r | |
| 18 | // Load the HVC arguments values into the appropriate registers\r | |
| 19 | ldr r7, [r0, #28]\r | |
| 20 | ldr r6, [r0, #24]\r | |
| 21 | ldr r5, [r0, #20]\r | |
| 22 | ldr r4, [r0, #16]\r | |
| 23 | ldr r3, [r0, #12]\r | |
| 24 | ldr r2, [r0, #8]\r | |
| 25 | ldr r1, [r0, #4]\r | |
| 26 | ldr r0, [r0, #0]\r | |
| 27 | \r | |
| 28 | hvc #0\r | |
| 29 | \r | |
| 30 | // Pop the ARM_HVC_ARGS structure address from the stack into r8\r | |
| 31 | pop {r8}\r | |
| 32 | \r | |
| 33 | // Load the HVC returned values into the appropriate registers\r | |
| 34 | // A HVC call can return up to 4 values - we do not need to store back r4-r7.\r | |
| 35 | str r3, [r8, #12]\r | |
| 36 | str r2, [r8, #8]\r | |
| 37 | str r1, [r8, #4]\r | |
| 38 | str r0, [r8, #0]\r | |
| 39 | \r | |
| 40 | mov r0, r8\r | |
| 41 | \r | |
| 42 | // Restore the registers r4-r8\r | |
| 43 | pop {r4-r8}\r | |
| 44 | \r | |
| 45 | bx lr\r |