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Commit aa42aa13 authored by Stefano Stabellini's avatar Stefano Stabellini
Browse files

arm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64 



Introduce CONFIG_XEN and the implementation of hypercall.S (that is
the only ARMv8 specific code in Xen support for ARM).

Compile enlighten.c and grant_table.c from arch/arm.

Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: default avatarIan Campbell <ian.campbell@citrix.com>
parent ea9c3652

arch/arm64/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -182,6 +182,16 @@ config HW_PERF_EVENTS 


source "mm/Kconfig"



config XEN_DOM0

	def_bool y

	depends on XEN



config XEN

	bool "Xen guest support on ARM64 (EXPERIMENTAL)"

	depends on ARM64 && OF

	help

	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.



endmenu



menu "Boot options"

arch/arm64/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ TEXT_OFFSET := 0x00080000 
export	TEXT_OFFSET GZFLAGS



core-y		+= arch/arm64/kernel/ arch/arm64/mm/

core-$(CONFIG_XEN)		+= arch/arm64/xen/

libs-y		:= arch/arm64/lib/ $(libs-y)

libs-y		+= $(LIBGCC)

arch/arm64/xen/Makefile

0 → 100644
+2 −0
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xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o)

obj-y		:= xen-arm.o hypercall.o

arch/arm64/xen/hypercall.S

0 → 100644
+92 −0
Original line number Diff line number Diff line 
/******************************************************************************

 * 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 procedure

 * call standard for the ARM 64-bit architecture: the first parameter is

 * passed in x0, the second in x1, the third in x2, the fourth in x3 and

 * the fifth in x4.

 *

 * The hypercall number is passed in x16.

 *

 * The return value is in x0.

 *

 * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM

 * hypercall tag.

 *

 * Parameter structs passed to hypercalls are laid out according to

 * the ARM 64-bit EABI standard.

 */



#include <linux/linkage.h>

#include <asm/assembler.h>

#include <xen/interface/xen.h>





#define XEN_IMM 0xEA1



#define HYPERCALL_SIMPLE(hypercall)		\

ENTRY(HYPERVISOR_##hypercall)			\

	mov x16, #__HYPERVISOR_##hypercall;	\

	hvc XEN_IMM;				\

	ret;					\

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_SIMPLE



                .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);



ENTRY(privcmd_call)

	mov x16, x0

	mov x0, x1

	mov x1, x2

	mov x2, x3

	mov x3, x4

	mov x4, x5

	hvc XEN_IMM

	ret

ENDPROC(privcmd_call);