[src/trunk]: src/sys/dev/acpi Add helper functions for walking GTDT subtables.

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

details:   https://anonhg.NetBSD.org/src/rev/2bf560e1f733
branches:  trunk
changeset: 993948:2bf560e1f733
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Oct 12 21:20:54 2018 +0000

description:
Add helper functions for walking GTDT subtables.

diffstat:

 sys/dev/acpi/acpi.c    |  47 +++++++++++++++++++++++++++++++++++++++++++++--
 sys/dev/acpi/acpivar.h |  10 +++++++++-
 2 files changed, 54 insertions(+), 3 deletions(-)

diffs (106 lines):

diff -r ad4be52d73bd -r 2bf560e1f733 sys/dev/acpi/acpi.c
--- a/sys/dev/acpi/acpi.c       Fri Oct 12 21:19:11 2018 +0000
+++ b/sys/dev/acpi/acpi.c       Fri Oct 12 21:20:54 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi.c,v 1.272 2018/10/11 22:58:36 jmcneill Exp $      */
+/*     $NetBSD: acpi.c,v 1.273 2018/10/12 21:20:54 jmcneill Exp $      */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -100,7 +100,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.272 2018/10/11 22:58:36 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.273 2018/10/12 21:20:54 jmcneill Exp $");
 
 #include "pci.h"
 #include "opt_acpi.h"
@@ -148,6 +148,7 @@
 extern kmutex_t                 acpi_interrupt_list_mtx;
 static ACPI_HANDLE      acpi_scopes[4];
 ACPI_TABLE_HEADER      *madt_header;
+ACPI_TABLE_HEADER      *gtdt_header;
 
 /*
  * This structure provides a context for the ACPI
@@ -1708,6 +1709,28 @@
        madt_header = NULL;
 }
 
+ACPI_STATUS
+acpi_gtdt_map(void)
+{
+       ACPI_STATUS  rv;
+
+       if (gtdt_header != NULL)
+               return AE_ALREADY_EXISTS;
+
+       rv = AcpiGetTable(ACPI_SIG_GTDT, 1, &gtdt_header);
+
+       if (ACPI_FAILURE(rv))
+               return rv;
+
+       return AE_OK;
+}
+
+void
+acpi_gtdt_unmap(void)
+{
+       gtdt_header = NULL;
+}
+
 /*
  * XXX: Refactor to be a generic function that walks tables.
  */
@@ -1731,6 +1754,26 @@
        }
 }
 
+void
+acpi_gtdt_walk(ACPI_STATUS (*func)(ACPI_GTDT_HEADER *, void *), void *aux)
+{
+       ACPI_GTDT_HEADER *hdrp;
+       char *gtdtend, *where;
+
+       gtdtend = (char *)gtdt_header + gtdt_header->Length;
+       where = (char *)gtdt_header + sizeof (ACPI_TABLE_GTDT);
+
+       while (where < gtdtend) {
+
+               hdrp = (ACPI_GTDT_HEADER *)where;
+
+               if (ACPI_FAILURE(func(hdrp, aux)))
+                       break;
+
+               where += hdrp->Length;
+       }
+}
+
 /*
  * Miscellaneous.
  */
diff -r ad4be52d73bd -r 2bf560e1f733 sys/dev/acpi/acpivar.h
--- a/sys/dev/acpi/acpivar.h    Fri Oct 12 21:19:11 2018 +0000
+++ b/sys/dev/acpi/acpivar.h    Fri Oct 12 21:20:54 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpivar.h,v 1.75 2018/05/05 17:16:23 christos Exp $    */
+/*     $NetBSD: acpivar.h,v 1.76 2018/10/12 21:20:54 jmcneill Exp $    */
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -351,6 +351,14 @@
                                       void *), void *);
 
 /*
+ * GTDT.
+ */
+ACPI_STATUS            acpi_gtdt_map(void);
+void                   acpi_gtdt_unmap(void);
+void                   acpi_gtdt_walk(ACPI_STATUS (*)(ACPI_GTDT_HEADER *,
+                                      void *), void *);
+
+/*
  * Quirk handling.
  */
 struct acpi_quirk {