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freebsd-dev/sys/powerpc/ofw/ofw_real.c
Justin Hibbits d6d0670814 powerpc/ofw: Fix malloc inside lock 
Summary:
Currently ofw_real_bounce_alloc() is requesting memory, using WAITOK, holding a
non-sleepable locks, called 'OF Bounce Page'.

Fix this by allocating the pages outside of the lock, and only updating the
global variables while holding the lock.

Submitted by:	Breno Leitao
Differential Revision:	https://reviews.freebsd.org/D14955
2018-04-08 16:43:56 +00:00

1111 lines
26 KiB
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/* $NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $ */
/*-
* SPDX-License-Identifier:BSD-4-Clause AND BSD-2-Clause-FreeBSD
*
* 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/vm_page.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <machine/ofw_machdep.h>
#include <machine/stdarg.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofwvar.h>
#include "ofw_if.h"
static int 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, const char *propname,
const 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, cell_t *args_and_returns);
static int ofw_real_interpret(ofw_t ofw, const char *cmd, int nreturns,
cell_t *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_interpret, ofw_real_interpret),
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);
static ofw_def_t ofw_32bit = {
OFW_STD_32BIT,
ofw_real_methods,
0
};
OFW_DEF(ofw_32bit);
static 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;
extern int ofw_real_mode;
/*
* 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_KMEM, 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)
{
caddr_t temp;
/*
* 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 and accessed from real mode.
*/
temp = contigmalloc(4 * PAGE_SIZE, M_OFWREAL, 0, 0,
ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT), PAGE_SIZE,
4 * PAGE_SIZE);
if (temp == NULL)
panic("%s: Not able to allocated contiguous memory\n", __func__);
mtx_lock(&of_bounce_mtx);
of_bounce_virt = temp;
of_bounce_phys = vtophys(of_bounce_virt);
of_bounce_size = 4 * PAGE_SIZE;
/*
* For virtual-mode OF, direct map this physical address so that
* we have a 32-bit virtual address to give OF.
*/
if (!ofw_real_mode && (!hw_direct_map || DMAP_BASE_ADDRESS != 0))
pmap_kenter(of_bounce_phys, of_bounce_phys);
mtx_unlock(&of_bounce_mtx);
}
static cell_t
ofw_real_map(const void *buf, size_t len)
{
static char emergency_buffer[255];
cell_t phys;
mtx_assert(&of_bounce_mtx, MA_OWNED);
if (of_bounce_virt == NULL) {
/*
* If we haven't set up the MMU, then buf is guaranteed
* to be accessible to OF, because the only memory we
* can use right now is memory mapped by firmware.
*/
if (!pmap_bootstrapped)
return (cell_t)((uintptr_t)buf & ~DMAP_BASE_ADDRESS);
/*
* 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.
* Copy into the emergency buffer, and reset at the end.
*/
of_bounce_virt = emergency_buffer;
of_bounce_phys = (vm_offset_t)of_bounce_virt &
~DMAP_BASE_ADDRESS;
of_bounce_size = sizeof(emergency_buffer);
}
/*
* Make sure the bounce page offset satisfies any reasonable
* alignment constraint.
*/
of_bounce_offset += sizeof(register_t) -
(of_bounce_offset % sizeof(register_t));
if (of_bounce_offset + len > of_bounce_size) {
panic("Oversize Open Firmware call!");
return 0;
}
if (buf != NULL)
memcpy(of_bounce_virt + of_bounce_offset, buf, len);
else
return (0);
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;
if (physaddr == 0)
return;
memcpy(buf,of_bounce_virt + (physaddr - of_bounce_phys),len);
}
/* Initialiser */
static int
ofw_real_init(ofw_t ofw, void *openfirm)
{
openfirmware = (int (*)(void *))openfirm;
mtx_init(&of_bounce_mtx, "OF Bounce Page", NULL, MTX_DEF);
of_bounce_virt = NULL;
return (0);
}
/*
* Generic functions
*/
/* Test to see if a service exists. */
static int
ofw_real_test(ofw_t ofw, const char *name)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t service;
cell_t missing;
} args;
args.name = (cell_t)(uintptr_t)"test";
args.nargs = 1;
args.nreturns = 1;
ofw_real_start();
args.service = ofw_real_map(name, strlen(name) + 1);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.service == 0 || openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t next;
} args;
args.name = (cell_t)(uintptr_t)"peer";
args.nargs = 1;
args.nreturns = 1;
args.node = node;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (0);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
return (args.next);
}
/* Return the first child of this node or 0. */
static phandle_t
ofw_real_child(ofw_t ofw, phandle_t node)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t child;
} args;
args.name = (cell_t)(uintptr_t)"child";
args.nargs = 1;
args.nreturns = 1;
args.node = node;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (0);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
return (args.child);
}
/* Return the parent of this node or 0. */
static phandle_t
ofw_real_parent(ofw_t ofw, phandle_t node)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t parent;
} args;
args.name = (cell_t)(uintptr_t)"parent";
args.nargs = 1;
args.nreturns = 1;
args.node = node;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (0);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t package;
} args;
args.name = (cell_t)(uintptr_t)"instance-to-package";
args.nargs = 1;
args.nreturns = 1;
args.instance = instance;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t propname;
int32_t proplen;
} args;
args.name = (cell_t)(uintptr_t)"getproplen";
args.nargs = 2;
args.nreturns = 1;
ofw_real_start();
args.package = package;
args.propname = ofw_real_map(propname, strlen(propname) + 1);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.propname == 0 || openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t propname;
cell_t buf;
cell_t buflen;
int32_t size;
} args;
args.name = (cell_t)(uintptr_t)"getprop";
args.nargs = 4;
args.nreturns = 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;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.propname == 0 || args.buf == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t previous;
cell_t buf;
cell_t flag;
} args;
args.name = (cell_t)(uintptr_t)"nextprop";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.package = package;
args.previous = ofw_real_map(previous, (previous != NULL) ? (strlen(previous) + 1) : 0);
args.buf = ofw_real_map(buf, size);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.buf == 0 || openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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, const char *propname,
const void *buf, size_t len)
{
vm_offset_t argsptr;
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;
args.name = (cell_t)(uintptr_t)"setprop";
args.nargs = 4;
args.nreturns = 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;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.propname == 0 || args.buf == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t buf;
cell_t len;
int32_t size;
} args;
args.name = (cell_t)(uintptr_t)"canon";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
args.buf = ofw_real_map(buf, len);
args.len = len;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.device == 0 || args.buf == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t package;
} args;
args.name = (cell_t)(uintptr_t)"finddevice";
args.nargs = 1;
args.nreturns = 1;
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.device == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t buf;
cell_t len;
int32_t size;
} args;
args.name = (cell_t)(uintptr_t)"instance-to-path";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.instance = instance;
args.buf = ofw_real_map(buf, len);
args.len = len;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.buf == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t buf;
cell_t len;
int32_t size;
} args;
args.name = (cell_t)(uintptr_t)"package-to-path";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.package = package;
args.buf = ofw_real_map(buf, len);
args.len = len;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.buf == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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, cell_t *args_and_returns)
{
vm_offset_t argsptr;
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 *ap, *cp;
int n;
args.name = (cell_t)(uintptr_t)"call-method";
args.nargs = 2;
args.nreturns = 1;
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++);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.method == 0 ||
openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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);
}
static int
ofw_real_interpret(ofw_t ofw, const char *cmd, int nreturns, cell_t *returns)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t slot[16];
} args;
cell_t status;
int i = 0, j = 0;
args.name = (cell_t)(uintptr_t)"interpret";
args.nargs = 1;
ofw_real_start();
args.nreturns = ++nreturns;
args.slot[i++] = ofw_real_map(cmd, strlen(cmd) + 1);
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
status = args.slot[i++];
while (i < 1 + nreturns)
returns[j++] = args.slot[i++];
return (status);
}
/*
* Device I/O functions
*/
/* Open an instance for a device. */
static ihandle_t
ofw_real_open(ofw_t ofw, const char *device)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t instance;
} args;
args.name = (cell_t)(uintptr_t)"open";
args.nargs = 1;
args.nreturns = 1;
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
argsptr = ofw_real_map(&args, sizeof(args));
if (args.device == 0 || openfirmware((void *)argsptr) == -1
|| args.instance == 0) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
return (args.instance);
}
/* Close an instance. */
static void
ofw_real_close(ofw_t ofw, ihandle_t instance)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
} args;
args.name = (cell_t)(uintptr_t)"close";
args.nargs = 1;
args.nreturns = 0;
args.instance = instance;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
openfirmware((void *)argsptr);
ofw_real_stop();
}
/* Read from an instance. */
static ssize_t
ofw_real_read(ofw_t ofw, ihandle_t instance, void *addr, size_t len)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t addr;
cell_t len;
int32_t actual;
} args;
args.name = (cell_t)(uintptr_t)"read";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.instance = instance;
args.addr = ofw_real_map(addr, len);
args.len = len;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.addr == 0 || openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t addr;
cell_t len;
int32_t actual;
} args;
args.name = (cell_t)(uintptr_t)"write";
args.nargs = 3;
args.nreturns = 1;
ofw_real_start();
args.instance = instance;
args.addr = ofw_real_map(addr, len);
args.len = len;
argsptr = ofw_real_map(&args, sizeof(args));
if (args.addr == 0 || openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t poshi;
cell_t poslo;
cell_t status;
} args;
args.name = (cell_t)(uintptr_t)"seek";
args.nargs = 3;
args.nreturns = 1;
args.instance = instance;
args.poshi = pos >> 32;
args.poslo = pos;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
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)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t virt;
cell_t size;
cell_t align;
cell_t baseaddr;
} args;
args.name = (cell_t)(uintptr_t)"claim";
args.nargs = 3;
args.nreturns = 1;
args.virt = (cell_t)(uintptr_t)virt;
args.size = size;
args.align = align;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
if (openfirmware((void *)argsptr) == -1) {
ofw_real_stop();
return ((void *)-1);
}
ofw_real_unmap(argsptr, &args, sizeof(args));
ofw_real_stop();
return ((void *)(uintptr_t)args.baseaddr);
}
/* Release an area of memory. */
static void
ofw_real_release(ofw_t ofw, void *virt, size_t size)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t virt;
cell_t size;
} args;
args.name = (cell_t)(uintptr_t)"release";
args.nargs = 2;
args.nreturns = 0;
args.virt = (cell_t)(uintptr_t)virt;
args.size = size;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
openfirmware((void *)argsptr);
ofw_real_stop();
}
/*
* Control transfer functions
*/
/* Suspend and drop back to the Open Firmware interface. */
static void
ofw_real_enter(ofw_t ofw)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
} args;
args.name = (cell_t)(uintptr_t)"enter";
args.nargs = 0;
args.nreturns = 0;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
openfirmware((void *)argsptr);
/* We may come back. */
ofw_real_stop();
}
/* Shut down and drop back to the Open Firmware interface. */
static void
ofw_real_exit(ofw_t ofw)
{
vm_offset_t argsptr;
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
} args;
args.name = (cell_t)(uintptr_t)"exit";
args.nargs = 0;
args.nreturns = 0;
ofw_real_start();
argsptr = ofw_real_map(&args, sizeof(args));
openfirmware((void *)argsptr);
for (;;) /* just in case */
;
ofw_real_stop();
}
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