[PATCH 2/6] X86 ACPI: Introduce x86 arch specific arch_reserve_mem_area() for e820 handling

[Thomas Renninger]

This is needed for ACPI table overriding via initrd. Beside reserving
memblocks, X86 also requires to flag the memory area to E820_RESERVED or
E820_ACPI in the e820 mappings to be able to io(re)map it later.

Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
---
 arch/x86/kernel/acpi/boot.c |    6 ++++++
 include/linux/acpi.h        |    9 +++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index b2297e5..6b75777 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1700,3 +1700,9 @@ int __acpi_release_global_lock(unsigned int *lock)
 	} while (unlikely (val != old));
 	return old & 0x1;
 }
+
+void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
+{
+	e820_add_region(addr, size, E820_ACPI);
+	update_e820();
+}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 4f2a762..bf6a0ad 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -430,4 +430,13 @@ acpi_status acpi_os_prepare_sleep(u8 sleep_state,
 #define acpi_os_set_prepare_sleep(func, pm1a_ctrl, pm1b_ctrl) do { } while (0)
 #endif
 
+#if CONFIG_X86
+void arch_reserve_mem_area(acpi_physical_address addr, size_t size);
+#else
+static inline void void arch_reserve_mem_area(acpi_physical_address addr,
+					      size_t size)
+{
+}
+#endif /* CONFIG_X86 */
+
 #endif	/*_LINUX_ACPI_H*/
-- 
1.7.6.1

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