1 files changed, 269 insertions, 0 deletions
diff --git a/sys/powerpc/ofw/rtas.c b/sys/powerpc/ofw/rtas.c
new file mode 100644
index 000000000000..c27598d8b94b
--- /dev/null
+++ b/sys/powerpc/ofw/rtas.c
@@ -0,0 +1,269 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2011 Nathan Whitehorn
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/endian.h>
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/stdarg.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/pcb.h>
+#include <machine/rtas.h>
+
+#include <dev/ofw/openfirm.h>
+
+static MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
+
+static vm_offset_t	rtas_bounce_phys;
+static caddr_t		rtas_bounce_virt;
+static off_t		rtas_bounce_offset;
+static size_t		rtas_bounce_size;
+static uintptr_t	rtas_private_data;
+static struct mtx	rtas_mtx;
+static phandle_t	rtas;
+
+/* From ofwcall.S */
+int rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat);
+extern uintptr_t	rtas_entry;
+extern register_t	rtasmsr;
+
+/*
+ * After the VM is up, allocate RTAS memory and instantiate it
+ */
+
+static void rtas_setup(void *);
+
+SYSINIT(rtas_setup, SI_SUB_KMEM, SI_ORDER_ANY, rtas_setup, NULL);
+
+static void
+rtas_setup(void *junk)
+{
+	ihandle_t rtasi;
+	cell_t rtas_size = 0, rtas_ptr;
+	char path[31];
+	int result;
+
+	rtas = OF_finddevice("/rtas");
+	if (rtas == -1) {
+		rtas = 0;
+		return;
+	}
+	OF_package_to_path(rtas, path, sizeof(path));
+
+	mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);
+
+	/* RTAS must be called with everything turned off in MSR */
+	rtasmsr = mfmsr();
+	rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE | PSL_LE);
+	#ifdef __powerpc64__
+	rtasmsr &= ~PSL_SF;
+	#endif
+
+	/*
+	 * Allocate rtas_size + one page of contiguous, wired physical memory
+	 * that can fit into a 32-bit address space and accessed from real mode.
+	 * This is used both to bounce arguments and for RTAS private data.
+	 *
+	 * It must be 4KB-aligned and not cross a 256 MB boundary.
+	 */
+
+	OF_getencprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size));
+	rtas_size = round_page(rtas_size);
+	rtas_bounce_virt = contigmalloc(rtas_size + PAGE_SIZE, M_RTAS, 0, 0,
+	    ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT),
+	    4096, 256*1024*1024);
+
+	rtas_private_data = vtophys(rtas_bounce_virt);
+	rtas_bounce_virt += rtas_size;	/* Actual bounce area */
+	rtas_bounce_phys = vtophys(rtas_bounce_virt);
+	rtas_bounce_size = PAGE_SIZE;
+
+	/*
+	 * Instantiate RTAS. We always use the 32-bit version.
+	 */
+
+	if (OF_hasprop(rtas, "linux,rtas-entry") &&
+	    OF_hasprop(rtas, "linux,rtas-base")) {
+		OF_getencprop(rtas, "linux,rtas-base", &rtas_ptr,
+		    sizeof(rtas_ptr));
+		rtas_private_data = rtas_ptr;
+		OF_getencprop(rtas, "linux,rtas-entry", &rtas_ptr,
+		    sizeof(rtas_ptr));
+	} else {
+		rtasi = OF_open(path);
+		if (rtasi == 0) {
+			rtas = 0;
+			printf("Error initializing RTAS: could not open "
+			    "node\n");
+			return;
+		}
+
+		result = OF_call_method("instantiate-rtas", rtasi, 1, 1,
+		    (cell_t)rtas_private_data, &rtas_ptr);
+		OF_close(rtasi);
+
+		if (result != 0) {
+			rtas = 0;
+			rtas_ptr = 0;
+			printf("Error initializing RTAS (%d)\n", result);
+			return;
+		}
+	}
+
+	rtas_entry = (uintptr_t)(rtas_ptr);
+}
+
+static cell_t
+rtas_real_map(const void *buf, size_t len)
+{
+	cell_t phys;
+
+	mtx_assert(&rtas_mtx, MA_OWNED);
+
+	/*
+	 * Make sure the bounce page offset satisfies any reasonable
+	 * alignment constraint.
+	 */
+	rtas_bounce_offset += sizeof(register_t) -
+	    (rtas_bounce_offset % sizeof(register_t));
+
+	if (rtas_bounce_offset + len > rtas_bounce_size) {
+		panic("Oversize RTAS call!");
+		return 0;
+	}
+
+	if (buf != NULL)
+		memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len);
+	else
+		return (0);
+
+	phys = rtas_bounce_phys + rtas_bounce_offset;
+	rtas_bounce_offset += len;
+
+	return (phys);
+}
+
+static void
+rtas_real_unmap(cell_t physaddr, void *buf, size_t len)
+{
+	mtx_assert(&rtas_mtx, MA_OWNED);
+
+	if (physaddr == 0)
+		return;
+
+	memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);
+}
+
+/* Check if we have RTAS */
+int
+rtas_exists(void)
+{
+	return (rtas != 0);
+}
+
+/* Call an RTAS method by token */
+int
+rtas_call_method(cell_t token, int nargs, int nreturns, ...)
+{
+	vm_offset_t argsptr;
+	jmp_buf env, *oldfaultbuf;
+	va_list ap;
+	struct {
+		cell_t token;
+		cell_t nargs;
+		cell_t nreturns;
+		cell_t args_n_results[12];
+	} args;
+	int n, result;
+
+	if (!rtas_exists() || nargs + nreturns > 12)
+		return (-1);
+
+	args.token = htobe32(token);
+	va_start(ap, nreturns);
+
+	mtx_lock_spin(&rtas_mtx);
+	rtas_bounce_offset = 0;
+
+	args.nargs = htobe32(nargs);
+	args.nreturns = htobe32(nreturns);
+
+	for (n = 0; n < nargs; n++)
+		args.args_n_results[n] = htobe32(va_arg(ap, cell_t));
+
+	argsptr = rtas_real_map(&args, sizeof(args));
+
+	/* Get rid of any stale machine checks that have been waiting.  */
+	__asm __volatile ("sync; isync");
+	oldfaultbuf = curthread->td_pcb->pcb_onfault;
+	curthread->td_pcb->pcb_onfault = &env;
+	if (!setjmp(env)) {
+		__asm __volatile ("sync");
+		result = rtascall(argsptr, rtas_private_data);
+		__asm __volatile ("sync; isync");
+	} else {
+		result = RTAS_HW_ERROR;
+	}
+	curthread->td_pcb->pcb_onfault = oldfaultbuf;
+	__asm __volatile ("sync");
+
+	rtas_real_unmap(argsptr, &args, sizeof(args));
+	mtx_unlock_spin(&rtas_mtx);
+
+	if (result < 0)
+		return (result);
+
+	for (n = nargs; n < nargs + nreturns; n++)
+		*va_arg(ap, cell_t *) = be32toh(args.args_n_results[n]);
+	return (result);
+}
+
+/* Look up an RTAS token */
+cell_t
+rtas_token_lookup(const char *method)
+{
+	cell_t token;
+
+	if (!rtas_exists())
+		return (-1);
+
+	if (OF_getencprop(rtas, method, &token, sizeof(token)) == -1)
+		return (-1);
+
+	return (token);
+}