[RFC PATCH v2 1/4] x86/boot: Add acpitb.h to help parse acpi tables

[Chao Fan]

In order to parse ACPI tables, reuse the head file linux/acpi.h,
so that the files in 'compressed' directory can read ACPI table
by including this head file.

Signed-off-by: Chao Fan <fanc.fnst@xxxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/acpitb.h | 49 +++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 arch/x86/boot/compressed/acpitb.h

diff --git a/arch/x86/boot/compressed/acpitb.h b/arch/x86/boot/compressed/acpitb.h
new file mode 100644
index 000000000000..b51dedb7c46f
--- /dev/null
+++ b/arch/x86/boot/compressed/acpitb.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/acpi.h>
+
+#define ACPI_MAX_TABLES                128
+
+struct acpi_table_header *get_acpi_srat_table(void);
+
+#ifdef ACPI_BIG_ENDIAN
+
+#define ACPI_MOVE_64_TO_64(d, s) \
+{((u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[7]; \
+((u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[6]; \
+((u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[5]; \
+((u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[4]; \
+((u8 *)(void *)(d))[4] = ((u8 *)(void *)(s))[3]; \
+((u8 *)(void *)(d))[5] = ((u8 *)(void *)(s))[2]; \
+((u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[1]; \
+((u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[0]; }
+
+#define ACPI_MOVE_16_TO_32(d, s) \
+{(*(u32 *)(void *)(d)) = 0; \
+((u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[1]; \
+((u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[0]; }
+
+#else
+#ifndef ACPI_MISALIGNMENT_NOT_SUPPORTED
+
+#define ACPI_MOVE_64_TO_64(d, s) \
+{*(u64 *)(void *)(d) = *(u64 *)(void *)(s); }
+
+#define ACPI_MOVE_16_TO_32(d, s) \
+{*(u32 *)(void *)(d) = *(u16 *)(void *)(s); }
+
+#else
+#define ACPI_MOVE_64_TO_64(d, s) \
+{((u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[0]; \
+((u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[1]; \
+((u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[2]; \
+((u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[3]; \
+((u8 *)(void *)(d))[4] = ((u8 *)(void *)(s))[4]; \
+((u8 *)(void *)(d))[5] = ((u8 *)(void *)(s))[5]; \
+((u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[6]; \
+((u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[7]; }
+
+#define ACPI_MOVE_16_TO_32(d, s) \
+{(*(u32 *)(void *)(d)) = 0; ACPI_MOVE_16_TO_16(d, s); }
+
+#endif
+#endif
-- 
2.17.1