1aa2466d2SStefano Stabellini/****************************************************************************** 2aa2466d2SStefano Stabellini * hypercall.S 3aa2466d2SStefano Stabellini * 4aa2466d2SStefano Stabellini * Xen hypercall wrappers 5aa2466d2SStefano Stabellini * 6aa2466d2SStefano Stabellini * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 7aa2466d2SStefano Stabellini * 8aa2466d2SStefano Stabellini * This program is free software; you can redistribute it and/or 9aa2466d2SStefano Stabellini * modify it under the terms of the GNU General Public License version 2 10aa2466d2SStefano Stabellini * as published by the Free Software Foundation; or, when distributed 11aa2466d2SStefano Stabellini * separately from the Linux kernel or incorporated into other 12aa2466d2SStefano Stabellini * software packages, subject to the following license: 13aa2466d2SStefano Stabellini * 14aa2466d2SStefano Stabellini * Permission is hereby granted, free of charge, to any person obtaining a copy 15aa2466d2SStefano Stabellini * of this source file (the "Software"), to deal in the Software without 16aa2466d2SStefano Stabellini * restriction, including without limitation the rights to use, copy, modify, 17aa2466d2SStefano Stabellini * merge, publish, distribute, sublicense, and/or sell copies of the Software, 18aa2466d2SStefano Stabellini * and to permit persons to whom the Software is furnished to do so, subject to 19aa2466d2SStefano Stabellini * the following conditions: 20aa2466d2SStefano Stabellini * 21aa2466d2SStefano Stabellini * The above copyright notice and this permission notice shall be included in 22aa2466d2SStefano Stabellini * all copies or substantial portions of the Software. 23aa2466d2SStefano Stabellini * 24aa2466d2SStefano Stabellini * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25aa2466d2SStefano Stabellini * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26aa2466d2SStefano Stabellini * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 27aa2466d2SStefano Stabellini * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28aa2466d2SStefano Stabellini * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 29aa2466d2SStefano Stabellini * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 30aa2466d2SStefano Stabellini * IN THE SOFTWARE. 31aa2466d2SStefano Stabellini */ 32aa2466d2SStefano Stabellini 33aa2466d2SStefano Stabellini/* 34aa2466d2SStefano Stabellini * The Xen hypercall calling convention is very similar to the ARM 35aa2466d2SStefano Stabellini * procedure calling convention: the first paramter is passed in r0, the 36aa2466d2SStefano Stabellini * second in r1, the third in r2 and the fourth in r3. Considering that 37aa2466d2SStefano Stabellini * Xen hypercalls have 5 arguments at most, the fifth paramter is passed 38aa2466d2SStefano Stabellini * in r4, differently from the procedure calling convention of using the 39aa2466d2SStefano Stabellini * stack for that case. 40aa2466d2SStefano Stabellini * 41aa2466d2SStefano Stabellini * The hypercall number is passed in r12. 42aa2466d2SStefano Stabellini * 43aa2466d2SStefano Stabellini * The return value is in r0. 44aa2466d2SStefano Stabellini * 45aa2466d2SStefano Stabellini * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM 46aa2466d2SStefano Stabellini * hypercall tag. 47aa2466d2SStefano Stabellini */ 48aa2466d2SStefano Stabellini 49aa2466d2SStefano Stabellini#include <linux/linkage.h> 50aa2466d2SStefano Stabellini#include <asm/assembler.h> 51c8d258a7SStefano Stabellini#include <asm/opcodes-virt.h> 52aa2466d2SStefano Stabellini#include <xen/interface/xen.h> 53aa2466d2SStefano Stabellini 54aa2466d2SStefano Stabellini 55c8d258a7SStefano Stabellini#define XEN_IMM 0xEA1 56aa2466d2SStefano Stabellini 57aa2466d2SStefano Stabellini#define HYPERCALL_SIMPLE(hypercall) \ 58aa2466d2SStefano StabelliniENTRY(HYPERVISOR_##hypercall) \ 59aa2466d2SStefano Stabellini mov r12, #__HYPERVISOR_##hypercall; \ 60c8d258a7SStefano Stabellini __HVC(XEN_IMM); \ 61aa2466d2SStefano Stabellini mov pc, lr; \ 62aa2466d2SStefano StabelliniENDPROC(HYPERVISOR_##hypercall) 63aa2466d2SStefano Stabellini 64aa2466d2SStefano Stabellini#define HYPERCALL0 HYPERCALL_SIMPLE 65aa2466d2SStefano Stabellini#define HYPERCALL1 HYPERCALL_SIMPLE 66aa2466d2SStefano Stabellini#define HYPERCALL2 HYPERCALL_SIMPLE 67aa2466d2SStefano Stabellini#define HYPERCALL3 HYPERCALL_SIMPLE 68aa2466d2SStefano Stabellini#define HYPERCALL4 HYPERCALL_SIMPLE 69aa2466d2SStefano Stabellini 70aa2466d2SStefano Stabellini#define HYPERCALL5(hypercall) \ 71aa2466d2SStefano StabelliniENTRY(HYPERVISOR_##hypercall) \ 72aa2466d2SStefano Stabellini stmdb sp!, {r4} \ 73aa2466d2SStefano Stabellini ldr r4, [sp, #4] \ 74aa2466d2SStefano Stabellini mov r12, #__HYPERVISOR_##hypercall; \ 75c8d258a7SStefano Stabellini __HVC(XEN_IMM); \ 76aa2466d2SStefano Stabellini ldm sp!, {r4} \ 77aa2466d2SStefano Stabellini mov pc, lr \ 78aa2466d2SStefano StabelliniENDPROC(HYPERVISOR_##hypercall) 79aa2466d2SStefano Stabellini 80aa2466d2SStefano Stabellini .text 81aa2466d2SStefano Stabellini 82aa2466d2SStefano StabelliniHYPERCALL2(xen_version); 83aa2466d2SStefano StabelliniHYPERCALL3(console_io); 84aa2466d2SStefano StabelliniHYPERCALL3(grant_table_op); 85aa2466d2SStefano StabelliniHYPERCALL2(sched_op); 86aa2466d2SStefano StabelliniHYPERCALL2(event_channel_op); 87aa2466d2SStefano StabelliniHYPERCALL2(hvm_op); 88aa2466d2SStefano StabelliniHYPERCALL2(memory_op); 89aa2466d2SStefano StabelliniHYPERCALL2(physdev_op); 90ea0af613SStefano StabelliniHYPERCALL3(vcpu_op); 91aa2466d2SStefano Stabellini 92aa2466d2SStefano StabelliniENTRY(privcmd_call) 93aa2466d2SStefano Stabellini stmdb sp!, {r4} 94aa2466d2SStefano Stabellini mov r12, r0 95aa2466d2SStefano Stabellini mov r0, r1 96aa2466d2SStefano Stabellini mov r1, r2 97aa2466d2SStefano Stabellini mov r2, r3 98aa2466d2SStefano Stabellini ldr r3, [sp, #8] 99aa2466d2SStefano Stabellini ldr r4, [sp, #4] 100c8d258a7SStefano Stabellini __HVC(XEN_IMM) 101aa2466d2SStefano Stabellini ldm sp!, {r4} 102aa2466d2SStefano Stabellini mov pc, lr 103aa2466d2SStefano StabelliniENDPROC(privcmd_call); 104