[Xen-devel] [PATCH v2 06/41] arm/acpi : Add basic ACPI initialization

[Parth Dixit <parth.dixit@xxxxxxxxxx>]

acpi_boot_table_init() will be called in start_xen
to get the RSDP and all the table pointers. with this patch,
we can get ACPI boot-time tables from firmware on ARM64.

Signed-off-by: Naresh Bhat <naresh.bhat@xxxxxxxxxx>
Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
 xen/arch/arm/acpi/Makefile |  1 +
 xen/arch/arm/acpi/boot.c   | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/setup.c       | 13 +++++++++--
 3 files changed, 68 insertions(+), 2 deletions(-)
 create mode 100644 xen/arch/arm/acpi/boot.c

diff --git a/xen/arch/arm/acpi/Makefile b/xen/arch/arm/acpi/Makefile
index b5be22d..196c40a 100644
--- a/xen/arch/arm/acpi/Makefile
+++ b/xen/arch/arm/acpi/Makefile
@@ -1 +1,2 @@
 obj-y += lib.o
+obj-y += boot.o
diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
new file mode 100644
index 0000000..8dc69d5
--- /dev/null
+++ b/xen/arch/arm/acpi/boot.c
@@ -0,0 +1,56 @@
+/*
+ *  ARM64 Specific Low-Level ACPI Boot Support
+ *
+ *  Copyright (C) 2014, Naresh Bhat <naresh.bhat@xxxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <xen/init.h>
+#include <xen/acpi.h>
+
+#include <asm/acpi.h>
+
+/*
+ * acpi_boot_table_init() called from setup_arch(), always.
+ *      1. find RSDP and get its address, and then find XSDT
+ *      2. extract all tables and checksums them all
+ *
+ * We can parse ACPI boot-time tables such as FADT, MADT after
+ * this function is called.
+ */
+int __init acpi_boot_table_init(void)
+{
+    int error;
+
+    /* If acpi_disabled, bail out */
+    if ( acpi_disabled )
+        return 1;
+
+    /* Initialize the ACPI boot-time table parser. */
+    error = acpi_table_init();
+    if ( error )
+    {
+        disable_acpi();
+        return error;
+    }
+
+    return 0;
+}
+
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 06f8e54..5711077 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -36,6 +36,7 @@
 #include <xen/pfn.h>
 #include <xen/vmap.h>
 #include <xen/libfdt/libfdt.h>
+#include <xen/acpi.h>
 #include <asm/page.h>
 #include <asm/current.h>
 #include <asm/setup.h>
@@ -45,10 +46,12 @@
 #include <asm/procinfo.h>
 #include <asm/setup.h>
 #include <xsm/xsm.h>
+#include <asm/acpi.h>
 
 struct bootinfo __initdata bootinfo;
 
 struct cpuinfo_arm __read_mostly boot_cpu_data;
+bool_t acpi_disabled;
 
 #ifdef CONFIG_ARM_32
 static unsigned long opt_xenheap_megabytes __initdata;
@@ -610,7 +613,6 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t 
dtb_size)
     init_xenheap_pages(pfn_to_paddr(xenheap_mfn_start),
                        pfn_to_paddr(boot_mfn_start));
 
-    end_boot_allocator();
 }
 #else /* CONFIG_ARM_64 */
 static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
@@ -680,7 +682,6 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t 
dtb_size)
     setup_frametable_mappings(ram_start, ram_end);
     max_page = PFN_DOWN(ram_end);
 
-    end_boot_allocator();
 }
 #endif
 
@@ -751,6 +752,14 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     setup_mm(fdt_paddr, fdt_size);
 
+    /*
+    * Parse the ACPI tables for possible boot-time configuration
+    */
+    if( !acpi_disabled )
+        acpi_boot_table_init();
+
+    end_boot_allocator();
+
     vm_init();
     dt_unflatten_host_device_tree();
 
-- 
1.9.1


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