On 2 August 2015 at 08:32, Bin Meng bmeng.cn@gmail.com wrote:
Hi Simon,
On Fri, Jul 31, 2015 at 11:31 PM, Simon Glass sjg@chromium.org wrote:
On x86 the global_data pointer is provided through a somewhat-bizarre and x86-specific mechanism: the F segment register 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
Nits: running as an EFI application
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
Reviewed-by: Bin Meng bmeng.cn@gmail.com
Applied to u-boot-x86.
Changes in v2:
- Move this patch to before the EFI start-up code patch
- Refer to FS as F segment register instead of frame segment register
- Rename CONFIG_ARCH_EFI to CONFIG_EFI_APP
arch/x86/include/asm/global_data.h | 7 +++++++ 1 file changed, 7 insertions(+)