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+/******************************************************************************
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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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+/*
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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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+
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+#include <linux/linkage.h>
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+#include <asm/assembler.h>
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+#include <xen/interface/xen.h>
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+
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+
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+#define XEN_IMM 0xEA1
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+
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+#define HYPERCALL_SIMPLE(hypercall) \
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+ENTRY(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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+ENDPROC(HYPERVISOR_##hypercall)
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+
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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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+
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+ .text
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+
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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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+
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+ENTRY(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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+ hvc XEN_IMM
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+ ret
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+ENDPROC(privcmd_call);
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Catalin Marinas