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/******************************************************************************
 * arch-arm.h
 *
 * Guest OS interface to ARM Xen.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (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.
 *
 * Copyright 2011 (C) Citrix Systems
 */

#ifndef __XEN_PUBLIC_ARCH_ARM_H__
#define __XEN_PUBLIC_ARCH_ARM_H__

/* hypercall calling convention
 * ----------------------------
 *
 * A hypercall is issued using the ARM HVC instruction.
 *
 * A hypercall can take up to 5 arguments. These are passed in
 * registers, the first argument in x0/r0 (for arm64/arm32 guests
 * respectively irrespective of whether the underlying hypervisor is
 * 32- or 64-bit), the second argument in x1/r1, the third in x2/r2,
 * the forth in x3/r3 and the fifth in x4/r4.
 *
 * The hypercall number is passed in r12 (arm) or x16 (arm64). In both
 * cases the relevant ARM procedure calling convention specifies this
 * is an inter-procedure-call scratch register (e.g. for use in linker
 * stubs). This use does not conflict with use during a hypercall.
 *
 * The HVC ISS must contain a Xen specific TAG: XEN_HYPERCALL_TAG.
 *
 * The return value is in x0/r0.
 *
 * The hypercall will clobber x16/r12 and the argument registers used
 * by that hypercall (except r0 which is the return value) i.e. in
 * addition to x16/r12 a 2 argument hypercall will clobber x1/r1 and a
 * 4 argument hypercall will clobber x1/r1, x2/r2 and x3/r3.
 *
 * Parameter structs passed to hypercalls are laid out according to
 * the Procedure Call Standard for the ARM Architecture (AAPCS, AKA
 * EABI) and Procedure Call Standard for the ARM 64-bit Architecture
 * (AAPCS64). Where there is a conflict the 64-bit standard should be
 * used regardless of guest type. Structures which are passed as
 * hypercall arguments are always little endian.
 */

#define XEN_HYPERCALL_TAG   0XEA1

#define uint64_aligned_t uint64_t __attribute__((aligned(8)))

#ifndef __ASSEMBLY__
#define ___DEFINE_XEN_GUEST_HANDLE(name, type)                  \
    typedef union { type *p; unsigned long q; }                 \
        __guest_handle_ ## name;                                \
    typedef union { type *p; uint64_aligned_t q; }              \
        __guest_handle_64_ ## name;

/*
 * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
 * in a struct in memory. On ARM is always 8 bytes sizes and 8 bytes
 * aligned.
 * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
 * hypercall argument. It is 4 bytes on aarch and 8 bytes on aarch64.
 */
#define __DEFINE_XEN_GUEST_HANDLE(name, type) \
    ___DEFINE_XEN_GUEST_HANDLE(name, type);   \
    ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
#define DEFINE_XEN_GUEST_HANDLE(name)   __DEFINE_XEN_GUEST_HANDLE(name, name)
#define __XEN_GUEST_HANDLE(name)        __guest_handle_64_ ## name
#define XEN_GUEST_HANDLE(name)          __XEN_GUEST_HANDLE(name)
/* this is going to be changed on 64 bit */
#define XEN_GUEST_HANDLE_PARAM(name)    __guest_handle_ ## name
#define set_xen_guest_handle_raw(hnd, val)                  \
    do {                                                    \
        typeof(&(hnd)) _sxghr_tmp = &(hnd);                 \
        _sxghr_tmp->q = 0;                                  \
        _sxghr_tmp->p = val;                                \
    } while ( 0 )
#ifdef __XEN_TOOLS__
#define get_xen_guest_handle(val, hnd)  do { val = (hnd).p; } while (0)
#endif
#define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)

#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
/* Anonymous union includes both 32- and 64-bit names (e.g., r0/x0). */
# define __DECL_REG(n64, n32) union {          \
        uint64_t n64;                          \
        uint32_t n32;                          \
    }
#else
/* Non-gcc sources must always use the proper 64-bit name (e.g., x0). */
#define __DECL_REG(n64, n32) uint64_t n64
#endif

struct vcpu_guest_core_regs
{
    /*         Aarch64       Aarch32 */
    __DECL_REG(x0,           r0_usr);
    __DECL_REG(x1,           r1_usr);
    __DECL_REG(x2,           r2_usr);
    __DECL_REG(x3,           r3_usr);
    __DECL_REG(x4,           r4_usr);
    __DECL_REG(x5,           r5_usr);
    __DECL_REG(x6,           r6_usr);
    __DECL_REG(x7,           r7_usr);
    __DECL_REG(x8,           r8_usr);
    __DECL_REG(x9,           r9_usr);
    __DECL_REG(x10,          r10_usr);
    __DECL_REG(x11,          r11_usr);
    __DECL_REG(x12,          r12_usr);

    __DECL_REG(x13,          sp_usr);
    __DECL_REG(x14,          lr_usr);

    __DECL_REG(x15,          __unused_sp_hyp);

    __DECL_REG(x16,          lr_irq);
    __DECL_REG(x17,          sp_irq);

    __DECL_REG(x18,          lr_svc);
    __DECL_REG(x19,          sp_svc);

    __DECL_REG(x20,          lr_abt);


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