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112 lines
3.6 KiB
112 lines
3.6 KiB
/****************************************************************************** |
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* hypercall.S |
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* |
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* Xen hypercall wrappers |
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* |
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* Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 |
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* as published by the Free Software Foundation; or, when distributed |
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* separately from the Linux kernel or incorporated into other |
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* software packages, subject to the following license: |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this source file (the "Software"), to deal in the Software without |
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* restriction, including without limitation the rights to use, copy, modify, |
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, |
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* and to permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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* IN THE SOFTWARE. |
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*/ |
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/* |
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* The Xen hypercall calling convention is very similar to the procedure |
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* call standard for the ARM 64-bit architecture: the first parameter is |
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* passed in x0, the second in x1, the third in x2, the fourth in x3 and |
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* the fifth in x4. |
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* |
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* The hypercall number is passed in x16. |
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* |
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* The return value is in x0. |
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* |
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* The hvc ISS is required to be 0xEA1, that is the Xen specific ARM |
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* hypercall tag. |
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* |
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* Parameter structs passed to hypercalls are laid out according to |
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* the ARM 64-bit EABI standard. |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include <asm/asm-uaccess.h> |
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#include <xen/interface/xen.h> |
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#define XEN_IMM 0xEA1 |
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#define HYPERCALL_SIMPLE(hypercall) \ |
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SYM_FUNC_START(HYPERVISOR_##hypercall) \ |
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mov x16, #__HYPERVISOR_##hypercall; \ |
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hvc XEN_IMM; \ |
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ret; \ |
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SYM_FUNC_END(HYPERVISOR_##hypercall) |
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#define HYPERCALL0 HYPERCALL_SIMPLE |
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#define HYPERCALL1 HYPERCALL_SIMPLE |
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#define HYPERCALL2 HYPERCALL_SIMPLE |
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#define HYPERCALL3 HYPERCALL_SIMPLE |
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#define HYPERCALL4 HYPERCALL_SIMPLE |
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#define HYPERCALL5 HYPERCALL_SIMPLE |
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.text |
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HYPERCALL2(xen_version); |
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HYPERCALL3(console_io); |
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HYPERCALL3(grant_table_op); |
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HYPERCALL2(sched_op); |
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HYPERCALL2(event_channel_op); |
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HYPERCALL2(hvm_op); |
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HYPERCALL2(memory_op); |
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HYPERCALL2(physdev_op); |
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HYPERCALL3(vcpu_op); |
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HYPERCALL1(tmem_op); |
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HYPERCALL1(platform_op_raw); |
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HYPERCALL2(multicall); |
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HYPERCALL2(vm_assist); |
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HYPERCALL3(dm_op); |
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SYM_FUNC_START(privcmd_call) |
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mov x16, x0 |
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mov x0, x1 |
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mov x1, x2 |
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mov x2, x3 |
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mov x3, x4 |
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mov x4, x5 |
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/* |
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* Privcmd calls are issued by the userspace. The kernel needs to |
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* enable access to TTBR0_EL1 as the hypervisor would issue stage 1 |
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* translations to user memory via AT instructions. Since AT |
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* instructions are not affected by the PAN bit (ARMv8.1), we only |
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* need the explicit uaccess_enable/disable if the TTBR0 PAN emulation |
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* is enabled (it implies that hardware UAO and PAN disabled). |
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*/ |
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uaccess_ttbr0_enable x6, x7, x8 |
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hvc XEN_IMM |
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/* |
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* Disable userspace access from kernel once the hyp call completed. |
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*/ |
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uaccess_ttbr0_disable x6, x7 |
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ret |
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SYM_FUNC_END(privcmd_call);
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