projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 76e95654 S |
1 | //------------------------------------------------------------------------------\r |
| 2 | //\r | |
| 3 | // Make ECALL to SBI\r | |
| 4 | //\r | |
| 5 | // Copyright (c) 2023, Ventana Micro Systems Inc. All rights reserved.<BR>\r | |
| 6 | //\r | |
| 7 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 8 | //\r | |
| 9 | //------------------------------------------------------------------------------\r | |
| 10 | \r | |
| 11 | #include <Register/RiscV64/RiscVImpl.h>\r | |
| 12 | \r | |
| 13 | .data\r | |
| 14 | .align 3\r | |
| 15 | .section .text\r | |
| 16 | \r | |
| 17 | //\r | |
| 18 | // Make ECALL to SBI\r | |
| 19 | // ecall updates the same a0 and a1 registers with\r | |
| 20 | // return values. Hence, the C function which calls\r | |
| 21 | // this should pass the address of Arg0 and Arg1.\r | |
| 22 | // This routine saves the address and updates it\r | |
| 23 | // with a0 and a1 once ecall returns.\r | |
| 24 | //\r | |
| 25 | // @param a0 : Pointer to Arg0\r | |
| 26 | // @param a1 : Pointer to Arg1\r | |
| 27 | // @param a2 : Arg2\r | |
| 28 | // @param a3 : Arg3\r | |
| 29 | // @param a4 : Arg4\r | |
| 30 | // @param a5 : Arg5\r | |
| 31 | // @param a6 : FunctionID\r | |
| 32 | // @param a7 : ExtensionId\r | |
| 33 | //\r | |
| 34 | ASM_FUNC (RiscVSbiEcall)\r | |
| 35 | mv t0, a0\r | |
| 36 | mv t1, a1\r | |
| 37 | ld a0, 0(a0)\r | |
| 38 | ld a1, 0(a1)\r | |
| 39 | ecall\r | |
| 40 | sd a0, 0(t0)\r | |
| 41 | sd a1, 0(t1)\r | |
| 42 | ret\r |