1 files changed, 73 insertions, 0 deletions
diff --git a/sys/arm/include/devmap.h b/sys/arm/include/devmap.h
new file mode 100644
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--- /dev/null
+++ b/sys/arm/include/devmap.h
@@ -0,0 +1,73 @@
+/*-
+ * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_MACHINE_DEVMAP_H_
+#define	_MACHINE_DEVMAP_H_
+
+/*
+ * This structure is used by MD code to describe static mappings of devices
+ * which are established as part of bringing up the MMU early in the boot.
+ */
+struct arm_devmap_entry {
+	vm_offset_t	pd_va;		/* virtual address */
+	vm_paddr_t	pd_pa;		/* physical address */
+	vm_size_t	pd_size;	/* size of region */
+	vm_prot_t	pd_prot;	/* protection code */
+	int		pd_cache;	/* cache attributes */
+};
+
+/*
+ * Register a platform-local table to be bootstrapped by the generic
+ * initarm() in arm/machdep.c.  This is used by newer code that allocates and
+ * fills in its own local table but does not have its own initarm() routine.
+ */
+void arm_devmap_register_table(const struct arm_devmap_entry * _table);
+
+/*
+ * Directly process a table; called from initarm() of older platforms that don't
+ * use the generic initarm() in arm/machdep.c.  If the table pointer is NULL,
+ * this will use the table installed previously by arm_devmap_register_table().
+ */
+void arm_devmap_bootstrap(vm_offset_t _l1pt, 
+    const struct arm_devmap_entry *_table);
+
+/*
+ * Routines to translate between virtual and physical addresses within a region
+ * that is static-mapped by the devmap code.  If the given address range isn't
+ * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
+ * The latter implies that you can't vtop just the last byte of physical address
+ * space.  This is not as limiting as it might sound, because even if a device
+ * occupies the end of the physical address space, you're only prevented from
+ * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
+ */
+#define	DEVMAP_PADDR_NOTFOUND	((vm_paddr_t)(-1))
+
+void *     arm_devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
+vm_paddr_t arm_devmap_vtop(void * _va, vm_size_t _sz);
+
+#endif