arch/x86: Combine bootblock linker scripts

Packing bootblock sections is somewhat easier to understand
when these all appear in one .ld file.

Change-Id: Ie8629a89fa47a28db63ecc33c631b29ac5a77448
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47597
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/arch/x86/bootblock.ld

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+gdtptr16_offset = gdtptr16 & 0xffff;
+nullidt_offset = nullidt & 0xffff;
+
+/* Symbol _start16bit must be aligned to 4kB to start AP CPUs with
+ * Startup IPI message without RAM.
+ */
+#if CONFIG(SIPI_VECTOR_IN_ROM)
+_bogus = ASSERT((_start16bit & 0xfff) == 0, "Symbol _start16bit is not at 4 KiB boundary");
+ap_sipi_vector_in_rom = (_start16bit >> 12) & 0xff;
+#endif
+
+SECTIONS {
+	/* Trigger an error if I have an unusable start address */
+	_bogus = ASSERT(_start16bit >= 0xffff0000, "_start16bit too low. Please report.");
+
+	. = (0xffffffff - CONFIG_ID_SECTION_OFFSET) - (__id_end - __id_start) + 1;
+	.id (.): {
+		KEEP(*(.id));
+	}
+
+	. = 0xffffffc0;
+	.fit_pointer (.): {
+		KEEP(*(.fit_pointer));
+	}
+
+	. = 0xfffffff0;
+	.reset . : {
+		*(.reset);
+		. = 15;
+		BYTE(0x00);
+	}
+}

src/arch/x86/id.ld

@@ -1,8 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-SECTIONS {
-	. = (0xffffffff - CONFIG_ID_SECTION_OFFSET) - (__id_end - __id_start) + 1;
-	.id (.): {
-		KEEP(*(.id))
-	}
-}

src/arch/x86/memlayout.ld

@@ -39,11 +39,5 @@ SECTIONS
 }
 
 #if ENV_BOOTBLOCK
-/* Bootblock specific scripts which provide more SECTION directives. */
-#include <cpu/x86/16bit/entry16.ld>
-#include <cpu/x86/16bit/reset16.ld>
-#include <arch/x86/id.ld>
-#if CONFIG(CPU_INTEL_FIRMWARE_INTERFACE_TABLE)
-#include <cpu/intel/fit/fit.ld>
-#endif
+#include <arch/x86/bootblock.ld>
 #endif  /* ENV_BOOTBLOCK */