Revert "cpu/x86/sipi: Add x86_64 support"

This reverts commit 18ad7fa51f.
Breaks Mpinit. The log shows:

SIPI module has no parameters.
MP initialization failure.

Change-Id: Ideed19437667124a02c0f03aa7be8dec042d0f44
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44734
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/x86/64bit/entry64.inc

@@ -16,12 +16,7 @@
 #endif
 
 #include <cpu/x86/msr.h>
-#if defined(__RAMSTAGE__)
-#include <arch/ram_segs.h>
-#else
 #include <arch/rom_segs.h>
-#endif
-
 
 setup_longmode:
 	/* Get page table address */
@@ -47,12 +42,7 @@ setup_longmode:
 	movl	%eax, %cr0
 
 	/* use long jump to switch to 64-bit code segment */
-#if defined(__RAMSTAGE__)
-	ljmp $RAM_CODE_SEG64, $__longmode_start
-#else
 	ljmp $ROM_CODE_SEG64, $__longmode_start
-
-#endif
 .code64
 __longmode_start:
 

src/cpu/x86/Makefile.inc

@@ -24,7 +24,6 @@ ifeq ($(CONFIG_PARALLEL_MP),y)
 $(TARGET_STAGE)-srcs += $(SIPI_BIN).manual
 endif
 rmodules_$(ARCH-$(TARGET_STAGE)-y)-$(CONFIG_PARALLEL_MP) += sipi_vector.S
-rmodules_$(ARCH-$(TARGET_STAGE)-y)-generic-ccopts += $($(TARGET_STAGE)-generic-ccopts)
 
 $(SIPI_DOTO): $(call src-to-obj,rmodules_$(ARCH-$(TARGET_STAGE)-y),src/cpu/x86/sipi_vector.S)
 	$(LD_rmodules_$(ARCH-$(TARGET_STAGE)-y)) -nostdlib -r -o $@ $^

src/cpu/x86/sipi_vector.S

@@ -192,24 +192,11 @@ load_msr:
 	mov	%eax, %cr4
 #endif
 
-#ifdef __x86_64__
-	/* entry64.inc preserves ebx. */
-#include <cpu/x86/64bit/entry64.inc>
-
-	mov	%rsi, %rdi	/* cpu_num */
-
-	movl	c_handler, %eax
-	call	*%rax
-#else
 	/* c_handler(cpu_num), preserve proper stack alignment */
 	sub	$12, %esp
 	push	%esi	/* cpu_num */
-
 	mov	c_handler, %eax
 	call	*%eax
-#endif
-
-
 halt_jump:
 	hlt
 	jmp	halt_jump