diff options
| author | Simon Glass <sjg@chromium.org> | 2017-01-16 07:03:59 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-02-06 11:38:46 +0800 |
| commit | a160092a610f4345cea5b606a8daf27d1feba185 (patch) | |
| tree | df18c0c3a3987c65e1093401d030b478e6ad09dc /arch/x86/include/asm | |
| parent | 93031595ede1c8a0ee1f7820ab9d719b0e9e51c7 (diff) | |
x86: Support global_data on x86_64
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>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/global_data.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index 7434f779b6..34e19efd14 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -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; } |