arm: mmio handlers

Basic infrastructure to emulate mmio reads and writes.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

2 files changed, 103 insertions, 0 deletions

diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c
new file mode 100644
index 0000000000..8789705169
--- /dev/null
+++ b/xen/arch/arm/io.c
@@ -0,0 +1,50 @@
+/*
+ * xen/arch/arm/io.h
+ *
+ * ARM I/O handlers
+ *
+ * Copyright (c) 2011 Citrix Systems.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <xen/config.h>
+#include <xen/lib.h>
+#include <asm/current.h>
+
+#include "io.h"
+
+static const struct mmio_handler *const mmio_handlers[] =
+{
+};
+#define MMIO_HANDLER_NR ARRAY_SIZE(mmio_handlers)
+
+int handle_mmio(mmio_info_t *info)
+{
+    struct vcpu *v = current;
+    int i;
+
+    for ( i = 0; i < MMIO_HANDLER_NR; i++ )
+        if ( mmio_handlers[i]->check_handler(v, info->gpa) )
+            return info->dabt.write ?
+                mmio_handlers[i]->write_handler(v, info) :
+                mmio_handlers[i]->read_handler(v, info);
+
+    return 0;
+}
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/io.h b/xen/arch/arm/io.h
new file mode 100644
index 0000000000..d7847e3841
--- /dev/null
+++ b/xen/arch/arm/io.h
@@ -0,0 +1,53 @@
+/*
+ * xen/arch/arm/io.h
+ *
+ * ARM I/O handlers
+ *
+ * Copyright (c) 2011 Citrix Systems.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __ARCH_ARM_IO_H__
+#define __ARCH_ARM_IO_H__
+
+#include <xen/lib.h>
+#include <asm/processor.h>
+
+typedef struct
+{
+    struct hsr_dabt dabt;
+    uint32_t gva;
+    paddr_t gpa;
+} mmio_info_t;
+
+typedef int (*mmio_read_t)(struct vcpu *v, mmio_info_t *info);
+typedef int (*mmio_write_t)(struct vcpu *v, mmio_info_t *info);
+typedef int (*mmio_check_t)(struct vcpu *v, paddr_t addr);
+
+struct mmio_handler {
+    mmio_check_t check_handler;
+    mmio_read_t read_handler;
+    mmio_write_t write_handler;
+};
+
+extern int handle_mmio(mmio_info_t *info);
+
+#endif
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */