From a1695504799f733c2fb1f030d1313535bbb5b065 Mon Sep 17 00:00:00 2001
From: Patrick Rudolph <patrick.rudolph@9elements.com>
Date: Sun, 1 Dec 2019 07:23:59 +0100
Subject: 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: I53eae082123d1a12cfa97ead1d87d84db4a334c0
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45187
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
---
 src/cpu/x86/64bit/entry64.inc | 10 ++++++++++
 src/cpu/x86/sipi_vector.S     | 15 +++++++++++++++
 2 files changed, 25 insertions(+)

(limited to 'src/cpu/x86')

diff --git a/src/cpu/x86/64bit/entry64.inc b/src/cpu/x86/64bit/entry64.inc
index 65c0fdc929..70255173f1 100644
--- a/src/cpu/x86/64bit/entry64.inc
+++ b/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:
 
diff --git a/src/cpu/x86/sipi_vector.S b/src/cpu/x86/sipi_vector.S
index 054f30d2c4..61d9e34466 100644
--- a/src/cpu/x86/sipi_vector.S
+++ b/src/cpu/x86/sipi_vector.S
@@ -5,6 +5,8 @@
 #include <cpu/x86/msr.h>
 #include <arch/ram_segs.h>
 
+#define __RAMSTAGE__
+
 /* The SIPI vector is responsible for initializing the APs in the system. It
  * loads microcode, sets up MSRs, and enables caching before calling into
  * C code. */
@@ -192,11 +194,24 @@ 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
-- 
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