On x86 the global_data pointer is provided through a somewhat-bizarre and x86-specific mechanism: the frame segment is set to a pointer to the start of global_data, so that accesses can use this build-in register.
When running as an EFI payload we don't want to mess with the Global Descriptor Table (GDT) and there is little advantage (in terms of code size) to doing so.
Allow global_data to be a simple variable in this case.
Signed-off-by: Simon Glass sjg@chromium.org ---
arch/x86/include/asm/global_data.h | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index abd70b9..6df6a78 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -76,6 +76,12 @@ struct arch_global_data { #include <asm-generic/global_data.h>
#ifndef __ASSEMBLY__ +# ifdef CONFIG_ARCH_EFI + +#define gd global_data_ptr + +#define DECLARE_GLOBAL_DATA_PTR extern struct global_data *global_data_ptr +# else static inline __attribute__((no_instrument_function)) gd_t *get_fs_gd_ptr(void) { gd_t *gd_ptr; @@ -88,6 +94,7 @@ static inline __attribute__((no_instrument_function)) gd_t *get_fs_gd_ptr(void) #define gd get_fs_gd_ptr()
#define DECLARE_GLOBAL_DATA_PTR +# endif
#endif