cpu/x86/sipi: Add x86_64 support

Enter long mode on secondary APs.

Tested on Lenovo T410 with additional x86_64 patches.
Tested on HP Z220 with additional x86_64 patches.

Still boots on x86_32.

Change-Id: I916dd8482d56c7509af9ad0d3b9c28bdc48fd0b1
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37395
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

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

@@ -16,7 +16,12 @@
 #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 */
@@ -42,7 +47,12 @@ 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

@@ -24,6 +24,7 @@ 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

@@ -192,11 +192,24 @@ 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