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kernel/linux-imx6_3.14.28/arch/arm/xen/hypercall.S 3.27 KB
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  /******************************************************************************
   * 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);
  
  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);