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Subject[PATCH 2/6] X86 ACPI: Introduce x86 arch specific arch_reserve_mem_area() for e820 handling
Date
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@suse.de>
---
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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