[Xen-devel] [PATCH v8 02/17] arm/acpi: Add basic ACPI initialization

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@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>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/arch/arm/acpi/Makefile |  1 +
 xen/arch/arm/acpi/boot.c   | 58 ++++++++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/setup.c       |  4 ++++
 3 files changed, 63 insertions(+)
 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..1570f7e
--- /dev/null
+++ b/xen/arch/arm/acpi/boot.c
@@ -0,0 +1,58 @@
+/*
+ *  ARM Specific Low-Level ACPI Boot Support
+ *
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@xxxxxxxxx>
+ *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@xxxxxxxxx>
+ *  Copyright (C) 2014, Naresh Bhat <naresh.bhat@xxxxxxxxxx>
+ *  Copyright (C) 2015, Shannon Zhao <shannon.zhao@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
+ *
+ * return value: (currently ignored)
+ *     0: success
+ *     !0: failure
+ *
+ * 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;
+
+    /* 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 e6b689e..fee5385 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>
@@ -755,6 +756,9 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     setup_mm(fdt_paddr, fdt_size);
 
+    /* Parse the ACPI tables for possible boot-time configuration */
+    acpi_boot_table_init();
+
     vm_init();
     dt_unflatten_host_device_tree();
 
-- 
2.0.4



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