[U-Boot] [PATCH v2 34/63] x86: Support global_data on x86_64

[Simon Glass]

At present this is just an ordinary variable. We may consider making it a
fixed register in the future.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2: None

 arch/x86/cpu/x86_64/cpu.c          | 13 +++++++++++++
 arch/x86/include/asm/global_data.h |  6 +++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/x86/cpu/x86_64/cpu.c b/arch/x86/cpu/x86_64/cpu.c
index c1d3788..da2ad11 100644
--- a/arch/x86/cpu/x86_64/cpu.c
+++ b/arch/x86/cpu/x86_64/cpu.c
@@ -8,6 +8,19 @@
 #include <common.h>
 #include <debug_uart.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Global declaration of gd */
+struct global_data *global_data_ptr;
+
+void arch_setup_gd(gd_t *new_gd)
+{
+	global_data_ptr = new_gd;
+
+	/* TODO(sjg at chromium.org): Why is this needed? */
+	printch(' ');
+}
+
 int cpu_has_64bit(void)
 {
 	return true;
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 7434f77..ce9e5cc 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -104,7 +104,7 @@ struct arch_global_data {
 #include <asm-generic/global_data.h>
 
 #ifndef __ASSEMBLY__
-# ifdef CONFIG_EFI_APP
+# if defined(CONFIG_EFI_APP) || CONFIG_IS_ENABLED(X86_64)
 
 #define gd global_data_ptr
 
@@ -114,7 +114,11 @@ static inline __attribute__((no_instrument_function)) gd_t *get_fs_gd_ptr(void)
 {
 	gd_t *gd_ptr;
 
+#if CONFIG_IS_ENABLED(X86_64)
+	asm volatile("fs mov 0, %0\n" : "=r" (gd_ptr));
+#else
 	asm volatile("fs movl 0, %0\n" : "=r" (gd_ptr));
+#endif
 
 	return gd_ptr;
 }
-- 
2.8.0.rc3.226.g39d4020