svn commit: r190747 - in head/sys: conf powerpc/ofw
Nathan Whitehorn
nwhitehorn at FreeBSD.org
Sun Apr 5 11:40:16 PDT 2009
Author: nwhitehorn
Date: Sun Apr 5 18:40:15 2009
New Revision: 190747
URL: http://svn.freebsd.org/changeset/base/190747
Log:
Add an Open Firmware access module for real-mode OF accesses to the PowerPC
build. This is required for the IBM Mambo simulator, as well as a variety
of non-Apple PowerPC hardware.
Added:
head/sys/powerpc/ofw/ofw_real.c (contents, props changed)
Modified:
head/sys/conf/files.powerpc
Modified: head/sys/conf/files.powerpc
==============================================================================
--- head/sys/conf/files.powerpc Sun Apr 5 18:30:24 2009 (r190746)
+++ head/sys/conf/files.powerpc Sun Apr 5 18:40:15 2009 (r190747)
@@ -111,6 +111,7 @@ powerpc/mpc85xx/opic.c optional mpc85xx
powerpc/mpc85xx/pci_ocp.c optional pci mpc85xx
powerpc/ofw/ofw_pcibus.c optional pci aim
powerpc/ofw/ofw_pcib_pci.c optional pci aim
+powerpc/ofw/ofw_real.c optional aim
powerpc/ofw/ofw_syscons.c optional sc aim
powerpc/powermac/ata_kauai.c optional powermac ata | powermac atamacio
powerpc/powermac/ata_macio.c optional powermac ata | powermac atamacio
Added: head/sys/powerpc/ofw/ofw_real.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/powerpc/ofw/ofw_real.c Sun Apr 5 18:40:15 2009 (r190747)
@@ -0,0 +1,922 @@
+/* $NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $ */
+
+/*-
+ * Copyright (C) 1995, 1996 Wolfgang Solfrank.
+ * Copyright (C) 1995, 1996 TooLs GmbH.
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
+ */
+/*-
+ * Copyright (C) 2000 Benno Rice.
+ * 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 Benno Rice ``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 TOOLS GMBH 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/systm.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/stdarg.h>
+#include <machine/bus.h>
+#include <machine/pmap.h>
+#include <machine/ofw_machdep.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofwvar.h>
+#include "ofw_if.h"
+
+static void ofw_real_init(ofw_t, void *openfirm);
+static int ofw_real_test(ofw_t, const char *name);
+static phandle_t ofw_real_peer(ofw_t, phandle_t node);
+static phandle_t ofw_real_child(ofw_t, phandle_t node);
+static phandle_t ofw_real_parent(ofw_t, phandle_t node);
+static phandle_t ofw_real_instance_to_package(ofw_t, ihandle_t instance);
+static ssize_t ofw_real_getproplen(ofw_t, phandle_t package,
+ const char *propname);
+static ssize_t ofw_real_getprop(ofw_t, phandle_t package, const char *propname,
+ void *buf, size_t buflen);
+static int ofw_real_nextprop(ofw_t, phandle_t package, const char *previous,
+ char *buf, size_t);
+static int ofw_real_setprop(ofw_t, phandle_t package, char *propname,
+ void *buf, size_t len);
+static ssize_t ofw_real_canon(ofw_t, const char *device, char *buf, size_t len);
+static phandle_t ofw_real_finddevice(ofw_t, const char *device);
+static ssize_t ofw_real_instance_to_path(ofw_t, ihandle_t instance, char *buf,
+ size_t len);
+static ssize_t ofw_real_package_to_path(ofw_t, phandle_t package, char *buf,
+ size_t len);
+static int ofw_real_call_method(ofw_t, ihandle_t instance, const char *method,
+ int nargs, int nreturns, unsigned long *args_and_returns);
+static ihandle_t ofw_real_open(ofw_t, const char *device);
+static void ofw_real_close(ofw_t, ihandle_t instance);
+static ssize_t ofw_real_read(ofw_t, ihandle_t instance, void *addr, size_t len);
+static ssize_t ofw_real_write(ofw_t, ihandle_t instance, const void *addr,
+ size_t len);
+static int ofw_real_seek(ofw_t, ihandle_t instance, u_int64_t pos);
+static caddr_t ofw_real_claim(ofw_t, void *virt, size_t size, u_int align);
+static void ofw_real_release(ofw_t, void *virt, size_t size);
+static void ofw_real_enter(ofw_t);
+static void ofw_real_exit(ofw_t);
+
+static ofw_method_t ofw_real_methods[] = {
+ OFWMETHOD(ofw_init, ofw_real_init),
+ OFWMETHOD(ofw_peer, ofw_real_peer),
+ OFWMETHOD(ofw_child, ofw_real_child),
+ OFWMETHOD(ofw_parent, ofw_real_parent),
+ OFWMETHOD(ofw_instance_to_package, ofw_real_instance_to_package),
+ OFWMETHOD(ofw_getproplen, ofw_real_getproplen),
+ OFWMETHOD(ofw_getprop, ofw_real_getprop),
+ OFWMETHOD(ofw_nextprop, ofw_real_nextprop),
+ OFWMETHOD(ofw_setprop, ofw_real_setprop),
+ OFWMETHOD(ofw_canon, ofw_real_canon),
+ OFWMETHOD(ofw_finddevice, ofw_real_finddevice),
+ OFWMETHOD(ofw_instance_to_path, ofw_real_instance_to_path),
+ OFWMETHOD(ofw_package_to_path, ofw_real_package_to_path),
+
+ OFWMETHOD(ofw_test, ofw_real_test),
+ OFWMETHOD(ofw_call_method, ofw_real_call_method),
+ OFWMETHOD(ofw_open, ofw_real_open),
+ OFWMETHOD(ofw_close, ofw_real_close),
+ OFWMETHOD(ofw_read, ofw_real_read),
+ OFWMETHOD(ofw_write, ofw_real_write),
+ OFWMETHOD(ofw_seek, ofw_real_seek),
+ OFWMETHOD(ofw_claim, ofw_real_claim),
+ OFWMETHOD(ofw_release, ofw_real_release),
+ OFWMETHOD(ofw_enter, ofw_real_enter),
+ OFWMETHOD(ofw_exit, ofw_real_exit),
+
+ { 0, 0 }
+};
+
+static ofw_def_t ofw_real = {
+ OFW_STD_REAL,
+ ofw_real_methods,
+ 0
+};
+OFW_DEF(ofw_real);
+
+MALLOC_DEFINE(M_OFWREAL, "ofwreal", "Open Firmware Real Mode Bounce Page");
+
+static int (*openfirmware)(void *);
+
+static vm_offset_t of_bounce_phys;
+static caddr_t of_bounce_virt;
+static off_t of_bounce_offset;
+static size_t of_bounce_size;
+static struct mtx of_bounce_mtx;
+
+/*
+ * After the VM is up, allocate a wired, low memory bounce page.
+ */
+
+static void ofw_real_bounce_alloc(void *);
+
+SYSINIT(ofw_real_bounce_alloc, SI_SUB_VM, SI_ORDER_ANY,
+ ofw_real_bounce_alloc, NULL);
+
+static void
+ofw_real_start(void)
+{
+ mtx_lock(&of_bounce_mtx);
+ of_bounce_offset = 0;
+}
+
+static void
+ofw_real_stop(void)
+{
+ mtx_unlock(&of_bounce_mtx);
+}
+
+static void
+ofw_real_bounce_alloc(void *junk)
+{
+ /*
+ * Check that ofw_real is actually in use before allocating wads
+ * of memory. Do this by checking if our mutex has been set up.
+ */
+ if (!mtx_initialized(&of_bounce_mtx))
+ return;
+
+ /*
+ * Allocate a page of contiguous, wired physical memory that can
+ * fit into a 32-bit address space.
+ */
+
+ mtx_lock(&of_bounce_mtx);
+
+ of_bounce_virt = contigmalloc(PAGE_SIZE, M_OFWREAL, 0,
+ 0, BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, PAGE_SIZE);
+ of_bounce_phys = vtophys(of_bounce_virt);
+ of_bounce_size = PAGE_SIZE;
+
+ mtx_unlock(&of_bounce_mtx);
+}
+
+static cell_t
+ofw_real_map(const void *buf, size_t len)
+{
+ cell_t phys;
+
+ mtx_assert(&of_bounce_mtx, MA_OWNED);
+
+ if (of_bounce_virt == NULL) {
+ if (!pmap_bootstrapped)
+ return (cell_t)buf;
+
+ /*
+ * XXX: It is possible for us to get called before the VM has
+ * come online, but after the MMU is up. We don't have the
+ * bounce buffer yet, but can no longer presume a 1:1 mapping.
+ * Grab the physical address of the buffer, and hope it is
+ * in range if this happens.
+ */
+ return (cell_t)vtophys(buf);
+ }
+
+ /*
+ * Make sure the bounce page offset satisfies any reasonable
+ * alignment constraint.
+ */
+ of_bounce_offset += of_bounce_offset % sizeof(register_t);
+
+ if (of_bounce_offset + len > of_bounce_size) {
+ panic("Oversize Open Firmware call!");
+ return 0;
+ }
+
+ memcpy(of_bounce_virt + of_bounce_offset, buf, len);
+ phys = of_bounce_phys + of_bounce_offset;
+
+ of_bounce_offset += len;
+
+ return phys;
+}
+
+static void
+ofw_real_unmap(cell_t physaddr, void *buf, size_t len)
+{
+ mtx_assert(&of_bounce_mtx, MA_OWNED);
+
+ if (of_bounce_virt == NULL)
+ return;
+
+ memcpy(buf,of_bounce_virt + (physaddr - of_bounce_phys),len);
+}
+
+/* Initialiser */
+
+static void
+ofw_real_init(ofw_t ofw, void *openfirm)
+{
+ openfirmware = (int (*)(void *))openfirm;
+
+ mtx_init(&of_bounce_mtx, "OF Bounce Page", MTX_DEF, 0);
+ of_bounce_virt = NULL;
+}
+
+/*
+ * Generic functions
+ */
+
+/* Test to see if a service exists. */
+static int
+ofw_real_test(ofw_t ofw, const char *name)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t service;
+ cell_t missing;
+ } args = {
+ (cell_t)"test",
+ 1,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.service = ofw_real_map(name, strlen(name) + 1);
+ if (args.service == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.missing);
+}
+
+/*
+ * Device tree functions
+ */
+
+/* Return the next sibling of this node or 0. */
+static phandle_t
+ofw_real_peer(ofw_t ofw, phandle_t node)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t node;
+ cell_t next;
+ } args = {
+ (cell_t)"peer",
+ 1,
+ 1,
+ };
+
+ args.node = node;
+ if (openfirmware(&args) == -1)
+ return (-1);
+ return (args.next);
+}
+
+/* Return the first child of this node or 0. */
+static phandle_t
+ofw_real_child(ofw_t ofw, phandle_t node)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t node;
+ cell_t child;
+ } args = {
+ (cell_t)"child",
+ 1,
+ 1,
+ };
+
+ args.node = node;
+ if (openfirmware(&args) == -1)
+ return (-1);
+ return (args.child);
+}
+
+/* Return the parent of this node or 0. */
+static phandle_t
+ofw_real_parent(ofw_t ofw, phandle_t node)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t node;
+ cell_t parent;
+ } args = {
+ (cell_t)"parent",
+ 1,
+ 1,
+ };
+
+ args.node = node;
+ if (openfirmware(&args) == -1)
+ return (-1);
+ return (args.parent);
+}
+
+/* Return the package handle that corresponds to an instance handle. */
+static phandle_t
+ofw_real_instance_to_package(ofw_t ofw, ihandle_t instance)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ cell_t package;
+ } args = {
+ (cell_t)"instance-to-package",
+ 1,
+ 1,
+ };
+
+ args.instance = instance;
+ if (openfirmware(&args) == -1)
+ return (-1);
+ return (args.package);
+}
+
+/* Get the length of a property of a package. */
+static ssize_t
+ofw_real_getproplen(ofw_t ofw, phandle_t package, const char *propname)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t package;
+ cell_t propname;
+ cell_t proplen;
+ } args = {
+ (cell_t)"getproplen",
+ 2,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.package = package;
+ args.propname = ofw_real_map(propname, strlen(propname) + 1);
+ if (args.propname == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.proplen);
+}
+
+/* Get the value of a property of a package. */
+static ssize_t
+ofw_real_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
+ size_t buflen)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t package;
+ cell_t propname;
+ cell_t buf;
+ cell_t buflen;
+ cell_t size;
+ } args = {
+ (cell_t)"getprop",
+ 4,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.package = package;
+ args.propname = ofw_real_map(propname, strlen(propname) + 1);
+ args.buf = ofw_real_map(buf, buflen);
+ args.buflen = buflen;
+ if (args.propname == 0 || args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.buf, buf, buflen);
+
+ ofw_real_stop();
+ return (args.size);
+}
+
+/* Get the next property of a package. */
+static int
+ofw_real_nextprop(ofw_t ofw, phandle_t package, const char *previous,
+ char *buf, size_t size)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t package;
+ cell_t previous;
+ cell_t buf;
+ cell_t flag;
+ } args = {
+ (cell_t)"nextprop",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.package = package;
+ args.previous = ofw_real_map(previous, strlen(previous) + 1);
+ args.buf = ofw_real_map(buf, size);
+ if (args.previous == 0 || args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.buf, buf, size);
+
+ ofw_real_stop();
+ return (args.flag);
+}
+
+/* Set the value of a property of a package. */
+/* XXX Has a bug on FirePower */
+static int
+ofw_real_setprop(ofw_t ofw, phandle_t package, char *propname, void *buf,
+ size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t package;
+ cell_t propname;
+ cell_t buf;
+ cell_t len;
+ cell_t size;
+ } args = {
+ (cell_t)"setprop",
+ 4,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.package = package;
+ args.propname = ofw_real_map(propname, strlen(propname) + 1);
+ args.buf = ofw_real_map(buf, len);
+ args.len = len;
+ if (args.propname == 0 || args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.size);
+}
+
+/* Convert a device specifier to a fully qualified pathname. */
+static ssize_t
+ofw_real_canon(ofw_t ofw, const char *device, char *buf, size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t device;
+ cell_t buf;
+ cell_t len;
+ cell_t size;
+ } args = {
+ (cell_t)"canon",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.device = ofw_real_map(device, strlen(device) + 1);
+ args.buf = ofw_real_map(buf, len);
+ args.len = len;
+ if (args.device == 0 || args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.buf, buf, len);
+
+ ofw_real_stop();
+ return (args.size);
+}
+
+/* Return a package handle for the specified device. */
+static phandle_t
+ofw_real_finddevice(ofw_t ofw, const char *device)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t device;
+ cell_t package;
+ } args = {
+ (cell_t)"finddevice",
+ 1,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.device = ofw_real_map(device, strlen(device) + 1);
+ if (args.device == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.package);
+}
+
+/* Return the fully qualified pathname corresponding to an instance. */
+static ssize_t
+ofw_real_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ cell_t buf;
+ cell_t len;
+ cell_t size;
+ } args = {
+ (cell_t)"instance-to-path",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.instance = instance;
+ args.buf = ofw_real_map(buf, len);
+ args.len = len;
+ if (args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.buf, buf, len);
+
+ ofw_real_stop();
+ return (args.size);
+}
+
+/* Return the fully qualified pathname corresponding to a package. */
+static ssize_t
+ofw_real_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t package;
+ cell_t buf;
+ cell_t len;
+ cell_t size;
+ } args = {
+ (cell_t)"package-to-path",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.package = package;
+ args.buf = ofw_real_map(buf, len);
+ args.len = len;
+ if (args.buf == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.buf, buf, len);
+
+ ofw_real_stop();
+ return (args.size);
+}
+
+/* Call the method in the scope of a given instance. */
+static int
+ofw_real_call_method(ofw_t ofw, ihandle_t instance, const char *method,
+ int nargs, int nreturns, unsigned long *args_and_returns)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t method;
+ cell_t instance;
+ cell_t args_n_results[12];
+ } args = {
+ (cell_t)"call-method",
+ 2,
+ 1,
+ };
+ cell_t *cp;
+ unsigned long *ap;
+ int n;
+
+ if (nargs > 6)
+ return (-1);
+
+ ofw_real_start();
+ args.nargs = nargs + 2;
+ args.nreturns = nreturns + 1;
+ args.method = ofw_real_map(method, strlen(method) + 1);
+ args.instance = instance;
+
+ ap = args_and_returns;
+ for (cp = args.args_n_results + (n = nargs); --n >= 0;)
+ *--cp = *(ap++);
+ if (args.method == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ if (args.args_n_results[nargs])
+ return (args.args_n_results[nargs]);
+ for (cp = args.args_n_results + nargs + (n = args.nreturns); --n > 0;)
+ *(ap++) = *--cp;
+ return (0);
+}
+
+/*
+ * Device I/O functions
+ */
+
+/* Open an instance for a device. */
+static ihandle_t
+ofw_real_open(ofw_t ofw, const char *device)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t device;
+ cell_t instance;
+ } args = {
+ (cell_t)"open",
+ 1,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.device = ofw_real_map(device, strlen(device) + 1);
+ if (args.device == 0 || openfirmware(&args) == -1
+ || args.instance == 0) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.instance);
+}
+
+/* Close an instance. */
+static void
+ofw_real_close(ofw_t ofw, ihandle_t instance)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ } args = {
+ (cell_t)"close",
+ 1,
+ };
+
+ args.instance = instance;
+ openfirmware(&args);
+}
+
+/* Read from an instance. */
+static ssize_t
+ofw_real_read(ofw_t ofw, ihandle_t instance, void *addr, size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ cell_t addr;
+ cell_t len;
+ cell_t actual;
+ } args = {
+ (cell_t)"read",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.instance = instance;
+ args.addr = ofw_real_map(addr, len);
+ args.len = len;
+ if (args.addr == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_unmap(args.addr, addr, len);
+
+ ofw_real_stop();
+ return (args.actual);
+}
+
+/* Write to an instance. */
+static ssize_t
+ofw_real_write(ofw_t ofw, ihandle_t instance, const void *addr, size_t len)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ cell_t addr;
+ cell_t len;
+ cell_t actual;
+ } args = {
+ (cell_t)"write",
+ 3,
+ 1,
+ };
+
+ ofw_real_start();
+
+ args.instance = instance;
+ args.addr = ofw_real_map(addr, len);
+ args.len = len;
+ if (args.addr == 0 || openfirmware(&args) == -1) {
+ ofw_real_stop();
+ return (-1);
+ }
+ ofw_real_stop();
+ return (args.actual);
+}
+
+/* Seek to a position. */
+static int
+ofw_real_seek(ofw_t ofw, ihandle_t instance, u_int64_t pos)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t instance;
+ cell_t poshi;
+ cell_t poslo;
+ cell_t status;
+ } args = {
+ (cell_t)"seek",
+ 3,
+ 1,
+ };
+
+ args.instance = instance;
+ args.poshi = pos >> 32;
+ args.poslo = pos;
+ if (openfirmware(&args) == -1)
+ return (-1);
+ return (args.status);
+}
+
+/*
+ * Memory functions
+ */
+
+/* Claim an area of memory. */
+static caddr_t
+ofw_real_claim(ofw_t ofw, void *virt, size_t size, u_int align)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t virt;
+ cell_t size;
+ cell_t align;
+ cell_t baseaddr;
+ } args = {
+ (cell_t)"claim",
+ 3,
+ 1,
+ };
+
+ args.virt = (cell_t)virt;
+ args.size = size;
+ args.align = align;
+ if (openfirmware(&args) == -1)
+ return ((void *)-1);
+ return ((void *)args.baseaddr);
+}
+
+/* Release an area of memory. */
+static void
+ofw_real_release(ofw_t ofw, void *virt, size_t size)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ cell_t virt;
+ cell_t size;
+ } args = {
+ (cell_t)"release",
+ 2,
+ };
+
+ args.virt = (cell_t)virt;
+ args.size = size;
+ openfirmware(&args);
+}
+
+/*
+ * Control transfer functions
+ */
+
+/* Suspend and drop back to the Open Firmware interface. */
+static void
+ofw_real_enter(ofw_t ofw)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ } args = {
+ (cell_t)"enter",
+ };
+
+ openfirmware(&args);
+ /* We may come back. */
+}
+
+/* Shut down and drop back to the Open Firmware interface. */
+static void
+ofw_real_exit(ofw_t ofw)
+{
+ static struct {
+ cell_t name;
+ cell_t nargs;
+ cell_t nreturns;
+ } args = {
+ (cell_t)"exit",
+ };
+
+ openfirmware(&args);
+ for (;;) /* just in case */
+ ;
+}
+
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