linux-kernel - [PATCH v3 2/3] x86/acpi: add a new x86_init_acpi structure to x86_init

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Date:   Mon, 19 Feb 2018 11:09:05 +0100
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-acpi@...r.kernel.org, x86@...nel.org
Cc:     rafael.j.wysocki@...el.com, lenb@...nel.org,
        boris.ostrovsky@...cle.com, hpa@...or.com, tglx@...utronix.de,
        mingo@...hat.com, Juergen Gross <jgross@...e.com>,
        stable@...r.kernel.org
Subject: [PATCH v3 2/3] x86/acpi: add a new x86_init_acpi structure to x86_init_ops

Add a new struct x86_init_acpi to x86_init_ops. For now it contains
only one init function to get the RSDP table address.

Cc: <stable@...r.kernel.org> # 4.11
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/include/asm/acpi.h     | 7 +++++++
 arch/x86/include/asm/x86_init.h | 9 +++++++++
 arch/x86/kernel/x86_init.c      | 5 +++++
 3 files changed, 21 insertions(+)

diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 11881726ed37..6609dd7289b5 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -31,6 +31,7 @@
 #include <asm/mmu.h>
 #include <asm/mpspec.h>
 #include <asm/realmode.h>
+#include <asm/x86_init.h>
 
 #ifdef CONFIG_ACPI_APEI
 # include <asm/pgtable_types.h>
@@ -133,6 +134,12 @@ static inline bool acpi_has_cpu_in_madt(void)
 	return !!acpi_lapic;
 }
 
+#define ACPI_HAVE_ARCH_GET_ROOT_POINTER
+static inline u64 acpi_arch_get_root_pointer(void)
+{
+	return x86_init.acpi.get_root_pointer();
+}
+
 #else /* !CONFIG_ACPI */
 
 #define acpi_lapic 0
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index fc2f082ac635..2e2c34d2bb00 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -131,6 +131,14 @@ struct x86_hyper_init {
 };
 
 /**
+ * struct x86_init_acpi - x86 ACPI init functions
+ * @get_root_pointer:		get RSDP address
+ */
+struct x86_init_acpi {
+	u64 (*get_root_pointer)(void);
+};
+
+/**
  * struct x86_init_ops - functions for platform specific setup
  *
  */
@@ -144,6 +152,7 @@ struct x86_init_ops {
 	struct x86_init_iommu		iommu;
 	struct x86_init_pci		pci;
 	struct x86_hyper_init		hyper;
+	struct x86_init_acpi		acpi;
 };
 
 /**
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 1151ccd72ce9..9e4e994a4836 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -30,6 +30,7 @@ int __init iommu_init_noop(void) { return 0; }
 void iommu_shutdown_noop(void) { }
 bool __init bool_x86_init_noop(void) { return false; }
 void x86_op_int_noop(int cpu) { }
+u64 u64_x86_init_noop(void) { return 0; }
 
 /*
  * The platform setup functions are preset with the default functions
@@ -91,6 +92,10 @@ struct x86_init_ops x86_init __initdata = {
 		.x2apic_available	= bool_x86_init_noop,
 		.init_mem_mapping	= x86_init_noop,
 	},
+
+	.acpi = {
+		.get_root_pointer	= u64_x86_init_noop,
+	},
 };
 
 struct x86_cpuinit_ops x86_cpuinit = {
-- 
2.13.6