[src/trunk]: src/sys/arch/arm/acpi Add helper functions used for parsing ACPI...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/80bebd36eacc
branches:  trunk
changeset: 836341:80bebd36eacc
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Oct 12 22:15:04 2018 +0000

description:
Add helper functions used for parsing ACPI tables before the ACPICA
subsystem can be brought online. ARM64 needs this primarily for
initializing the SBSA UART via SPCR table, reading ARM boot flags from the
FADT, counting CPUs, etc.

diffstat:

 sys/arch/arm/acpi/acpi_table.c |  115 +++++++++++++++++++++++++++++++++++++++++
 sys/arch/arm/acpi/acpi_table.h |   39 +++++++++++++
 2 files changed, 154 insertions(+), 0 deletions(-)

diffs (162 lines):

diff -r 5205a04da875 -r 80bebd36eacc sys/arch/arm/acpi/acpi_table.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/acpi/acpi_table.c    Fri Oct 12 22:15:04 2018 +0000
@@ -0,0 +1,115 @@
+/* $NetBSD: acpi_table.c,v 1.1 2018/10/12 22:15:04 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jared McNeill <jmcneill%invisible.ca@localhost>.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * ACPI table functions for use in early boot before ACPICA can be safely
+ * initialized.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: acpi_table.c,v 1.1 2018/10/12 22:15:04 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/device.h>
+
+#include <uvm/uvm_extern.h>
+
+#include <dev/acpi/acpireg.h>
+#include <dev/acpi/acpivar.h>
+
+#include <machine/acpi_machdep.h>
+
+#include <arch/arm/acpi/acpi_table.h>
+
+ACPI_STATUS
+acpi_table_map(ACPI_PHYSICAL_ADDRESS pa, void **hdrp)
+{
+       ACPI_TABLE_HEADER *header;
+       ACPI_STATUS rv;
+       UINT32 length;
+
+       rv = acpi_md_OsMapMemory(pa, sizeof(*header), (void **)&header);
+       if (ACPI_FAILURE(rv))
+               return rv;
+       length = header->Length;
+       acpi_md_OsUnmapMemory(header, sizeof(*header));
+
+       return acpi_md_OsMapMemory(pa, length, hdrp);
+}
+
+void
+acpi_table_unmap(ACPI_TABLE_HEADER *hdrp)
+{
+       acpi_md_OsUnmapMemory(hdrp, hdrp->Length);
+}
+
+ACPI_STATUS
+acpi_table_find(const char *sig, void **hdrp)
+{
+       ACPI_TABLE_RSDP *rsdp;
+       ACPI_TABLE_XSDT *xsdt;
+       ACPI_TABLE_HEADER *header;
+       ACPI_PHYSICAL_ADDRESS pa;
+       ACPI_STATUS rv;
+
+       /* RDSP contains a pointer to the XSDT */
+       pa = 0;
+       rv = acpi_md_OsMapMemory(acpi_md_OsGetRootPointer(), sizeof(*rsdp), (void **)&rsdp);
+       if (ACPI_FAILURE(rv))
+               return rv;
+       if (memcmp(rsdp->Signature, ACPI_SIG_RSDP, sizeof(rsdp->Signature)) == 0)
+               pa = rsdp->XsdtPhysicalAddress;
+       acpi_md_OsUnmapMemory(rsdp, sizeof(*rsdp));
+       if (pa == 0)
+               return AE_NOT_FOUND;
+
+       /* XSDT contains pointers to other tables */
+       rv = acpi_table_map(pa, (void **)&xsdt);
+       if (ACPI_FAILURE(rv))
+               return rv;
+       const u_int entries = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / ACPI_XSDT_ENTRY_SIZE;
+       for (u_int n = 0; n < entries; n++) {
+               rv = acpi_table_map(xsdt->TableOffsetEntry[n], (void **)&header);
+               if (ACPI_FAILURE(rv))
+                       continue;
+               if (memcmp(header->Signature, sig, sizeof(header->Signature)) == 0) {
+                       acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt);
+                       *hdrp = header;
+                       return AE_OK;
+               }
+       }
+
+       /* Not found */
+       acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt);
+       return AE_NOT_FOUND;
+}
diff -r 5205a04da875 -r 80bebd36eacc sys/arch/arm/acpi/acpi_table.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/acpi/acpi_table.h    Fri Oct 12 22:15:04 2018 +0000
@@ -0,0 +1,39 @@
+/* $NetBSD: acpi_table.h,v 1.1 2018/10/12 22:15:04 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jared McNeill <jmcneill%invisible.ca@localhost>.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#ifndef _ARM_ACPI_TABLE_H
+#define _ARM_ACPI_TABLE_H
+
+ACPI_STATUS    acpi_table_map(ACPI_PHYSICAL_ADDRESS, void **);
+ACPI_STATUS    acpi_table_find(const char *, void **);
+void           acpi_table_unmap(ACPI_TABLE_HEADER *);
+
+#endif /* !_ARM_ACPI_TABLE_H */