x86: Simplify codes in write_tables()

Given all table write routines have the same signature, we can
simplify the codes by using a function table.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/lib/tables.c

@@ -11,6 +11,32 @@
 #include <asm/tables.h>
 #include <asm/acpi_table.h>
 
+/**
+ * Function prototype to write a specific configuration table
+ *
+ * @addr:	start address to write the table
+ * @return:	end address of the table
+ */
+typedef u32 (*table_write)(u32 addr);
+
+static table_write table_write_funcs[] = {
+#ifdef CONFIG_GENERATE_PIRQ_TABLE
+	write_pirq_routing_table,
+#endif
+#ifdef CONFIG_GENERATE_SFI_TABLE
+	write_sfi_table,
+#endif
+#ifdef CONFIG_GENERATE_MP_TABLE
+	write_mp_table,
+#endif
+#ifdef CONFIG_GENERATE_ACPI_TABLE
+	write_acpi_tables,
+#endif
+#ifdef CONFIG_GENERATE_SMBIOS_TABLE
+	write_smbios_table,
+#endif
+};
+
 u8 table_compute_checksum(void *v, int len)
 {
 	u8 *bytes = v;
@@ -39,32 +65,13 @@ void table_fill_string(char *dest, const char *src, size_t n, char pad)
 
 void write_tables(void)
 {
-	u32 __maybe_unused rom_table_start = ROM_TABLE_ADDR;
-	u32 __maybe_unused rom_table_end;
+	u32 rom_table_start = ROM_TABLE_ADDR;
+	u32 rom_table_end;
+	int i;
 
-#ifdef CONFIG_GENERATE_PIRQ_TABLE
-	rom_table_end = write_pirq_routing_table(rom_table_start);
-	rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
-	rom_table_start = rom_table_end;
-#endif
-#ifdef CONFIG_GENERATE_SFI_TABLE
-	rom_table_end = write_sfi_table(rom_table_start);
-	rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
-	rom_table_start = rom_table_end;
-#endif
-#ifdef CONFIG_GENERATE_MP_TABLE
-	rom_table_end = write_mp_table(rom_table_start);
-	rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
-	rom_table_start = rom_table_end;
-#endif
-#ifdef CONFIG_GENERATE_ACPI_TABLE
-	rom_table_end = write_acpi_tables(rom_table_start);
-	rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
-	rom_table_start = rom_table_end;
-#endif
-#ifdef CONFIG_GENERATE_SMBIOS_TABLE
-	rom_table_end = write_smbios_table(rom_table_start);
-	rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
-	rom_table_start = rom_table_end;
-#endif
+	for (i = 0; i < ARRAY_SIZE(table_write_funcs); i++) {
+		rom_table_end = table_write_funcs[i](rom_table_start);
+		rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
+		rom_table_start = rom_table_end;
+	}
 }