| /****************************************************************************** |
| * hypercall.S |
| * |
| * Xen hypercall wrappers |
| * |
| * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation; or, when distributed |
| * separately from the Linux kernel or incorporated into other |
| * software packages, subject to the following license: |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this source file (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, copy, modify, |
| * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| /* |
| * The Xen hypercall calling convention is very similar to the ARM |
| * procedure calling convention: the first paramter is passed in r0, the |
| * second in r1, the third in r2 and the fourth in r3. Considering that |
| * Xen hypercalls have 5 arguments at most, the fifth paramter is passed |
| * in r4, differently from the procedure calling convention of using the |
| * stack for that case. |
| * |
| * The hypercall number is passed in r12. |
| * |
| * The return value is in r0. |
| * |
| * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM |
| * hypercall tag. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/opcodes-virt.h> |
| #include <xen/interface/xen.h> |
| |
| |
| #define XEN_IMM 0xEA1 |
| |
| #define HYPERCALL_SIMPLE(hypercall) \ |
| ENTRY(HYPERVISOR_##hypercall) \ |
| mov r12, #__HYPERVISOR_##hypercall; \ |
| __HVC(XEN_IMM); \ |
| mov pc, lr; \ |
| ENDPROC(HYPERVISOR_##hypercall) |
| |
| #define HYPERCALL0 HYPERCALL_SIMPLE |
| #define HYPERCALL1 HYPERCALL_SIMPLE |
| #define HYPERCALL2 HYPERCALL_SIMPLE |
| #define HYPERCALL3 HYPERCALL_SIMPLE |
| #define HYPERCALL4 HYPERCALL_SIMPLE |
| |
| #define HYPERCALL5(hypercall) \ |
| ENTRY(HYPERVISOR_##hypercall) \ |
| stmdb sp!, {r4} \ |
| ldr r4, [sp, #4] \ |
| mov r12, #__HYPERVISOR_##hypercall; \ |
| __HVC(XEN_IMM); \ |
| ldm sp!, {r4} \ |
| mov pc, lr \ |
| ENDPROC(HYPERVISOR_##hypercall) |
| |
| .text |
| |
| HYPERCALL2(xen_version); |
| HYPERCALL3(console_io); |
| HYPERCALL3(grant_table_op); |
| HYPERCALL2(sched_op); |
| HYPERCALL2(event_channel_op); |
| HYPERCALL2(hvm_op); |
| HYPERCALL2(memory_op); |
| HYPERCALL2(physdev_op); |
| HYPERCALL3(vcpu_op); |
| HYPERCALL1(tmem_op); |
| HYPERCALL2(multicall); |
| |
| ENTRY(privcmd_call) |
| stmdb sp!, {r4} |
| mov r12, r0 |
| mov r0, r1 |
| mov r1, r2 |
| mov r2, r3 |
| ldr r3, [sp, #8] |
| ldr r4, [sp, #4] |
| __HVC(XEN_IMM) |
| ldm sp!, {r4} |
| mov pc, lr |
| ENDPROC(privcmd_call); |