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x86: Don't build call64 and setjmp on 64-bit 

These are currently not supported. Calling 64-bit code from 64-bit U-Boot is
much simpler, so this code is not needed. setjmp() is not yet implemented for
64-bit.

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 07:04:10 -07:00 committed by Bin Meng
parent 05cbd985c0
commit 23b89d4d6e
2 changed files with 12 additions and 1 deletions
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6
arch/x86/cpu/Makefile
View File

@ -14,7 +14,11 @@ else
extra-y = start.o
endif
extra-$(CONFIG_$(SPL_)X86_16BIT_INIT) += resetvec.o start16.o
obj-y += cpu.o cpu_x86.o call64.o setjmp.o
ifndef CONFIG_$(SPL_)X86_64
obj-y += call64.o setjmp.o
endif
obj-y += cpu.o cpu_x86.o
AFLAGS_REMOVE_call32.o := -mregparm=3 \
$(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)

7
arch/x86/lib/bootm.c
View File

@ -155,7 +155,14 @@ int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit)
puts("Cannot boot 64-bit kernel on 32-bit machine\n");
return -EFAULT;
}
/* At present 64-bit U-Boot does not support booting a
* kernel.
* TODO(sjg@chromium.org): Support booting both 32-bit and
* 64-bit kernels from 64-bit U-Boot.
*/
#if !CONFIG_IS_ENABLED(X86_64)
return cpu_jump_to_64bit(setup_base, load_address);
#endif
} else {
/*
* Set %ebx, %ebp, and %edi to 0, %esi to point to the