projects / u-boot.git / blame
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1 | /* SPDX-License-Identifier: GPL-2.0 |
| 2 | * | |
| 3 | * hypercall.S | |
| 4 | * | |
| 5 | * Xen hypercall wrappers | |
| 6 | * | |
| 7 | * Stefano Stabellini <[email protected]>, Citrix, 2012 | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License version 2 | |
| 11 | * as published by the Free Software Foundation; or, when distributed | |
| 12 | * separately from the Linux kernel or incorporated into other | |
| 13 | * software packages, subject to the following license: | |
| 14 | * | |
| 15 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 16 | * of this source file (the "Software"), to deal in the Software without | |
| 17 | * restriction, including without limitation the rights to use, copy, modify, | |
| 18 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
| 19 | * and to permit persons to whom the Software is furnished to do so, subject to | |
| 20 | * the following conditions: | |
| 21 | * | |
| 22 | * The above copyright notice and this permission notice shall be included in | |
| 23 | * all copies or substantial portions of the Software. | |
| 24 | * | |
| 25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 28 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 29 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| 30 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
| 31 | * IN THE SOFTWARE. | |
| 32 | */ | |
| 33 | ||
| 34 | /* | |
| 35 | * The Xen hypercall calling convention is very similar to the procedure | |
| 36 | * call standard for the ARM 64-bit architecture: the first parameter is | |
| 37 | * passed in x0, the second in x1, the third in x2, the fourth in x3 and | |
| 38 | * the fifth in x4. | |
| 39 | * | |
| 40 | * The hypercall number is passed in x16. | |
| 41 | * | |
| 42 | * The return value is in x0. | |
| 43 | * | |
| 44 | * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM | |
| 45 | * hypercall tag. | |
| 46 | * | |
| 47 | * Parameter structs passed to hypercalls are laid out according to | |
| 48 | * the ARM 64-bit EABI standard. | |
| 49 | */ | |
| 50 | ||
| 51 | #include <xen/interface/xen.h> | |
| 52 | ||
| 53 | #define XEN_HYPERCALL_TAG 0xEA1 | |
| 54 | ||
| 55 | #define HYPERCALL_SIMPLE(hypercall) \ | |
| 56 | .globl HYPERVISOR_##hypercall; \ | |
| 57 | .align 4,0x90; \ | |
| 58 | HYPERVISOR_##hypercall: \ | |
| 59 | mov x16, #__HYPERVISOR_##hypercall; \ | |
| 60 | hvc XEN_HYPERCALL_TAG; \ | |
| 61 | ret; \ | |
| 62 | ||
| 63 | #define HYPERCALL0 HYPERCALL_SIMPLE | |
| 64 | #define HYPERCALL1 HYPERCALL_SIMPLE | |
| 65 | #define HYPERCALL2 HYPERCALL_SIMPLE | |
| 66 | #define HYPERCALL3 HYPERCALL_SIMPLE | |
| 67 | #define HYPERCALL4 HYPERCALL_SIMPLE | |
| 68 | #define HYPERCALL5 HYPERCALL_SIMPLE | |
| 69 | ||
| 70 | .text | |
| 71 | ||
| 72 | HYPERCALL2(xen_version); | |
| 73 | HYPERCALL3(console_io); | |
| 74 | HYPERCALL3(grant_table_op); | |
| 75 | HYPERCALL2(sched_op); | |
| 76 | HYPERCALL2(event_channel_op); | |
| 77 | HYPERCALL2(hvm_op); | |
| 78 | HYPERCALL2(memory_op); |