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b6a5c58240
In an effort to clarify and simplify the annotation of assembly functions in the kernel new macros have been introduced. These replace ENTRY and ENDPROC. Update the annotations in the xen code to the new macros. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Julien Grall <julien@xen.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Signed-off-by: Will Deacon <will@kernel.org>
112 lines
3.6 KiB
ArmAsm
112 lines
3.6 KiB
ArmAsm
/******************************************************************************
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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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