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x86: Support global_data on x86_64

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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@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2017-01-16 07:03:59 -07:00
committed by Bin Meng
parent 93031595ed
commit a160092a61
2 changed files with 33 additions and 1 deletions
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7
arch/x86/include/asm/global_data.h
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@@ -104,8 +104,9 @@ 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)
/* TODO(sjg@chromium.org): Consider using a fixed register for gd on x86_64 */
#define gd global_data_ptr
#define DECLARE_GLOBAL_DATA_PTR extern struct global_data *global_data_ptr
@@ -114,7 +115,11 @@ 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;
}