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 ---
Changes in v3: - Add a TODO indicating that booting 32- and 64-bit kernels should be supported
Changes in v2: None
arch/x86/cpu/Makefile | 6 +++++- arch/x86/lib/bootm.c | 7 +++++++ 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 7f89ff047fa..f0135a759e9 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -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) diff --git a/arch/x86/lib/bootm.c b/arch/x86/lib/bootm.c index e5e63f6888e..3c3d9e1e800 100644 --- a/arch/x86/lib/bootm.c +++ b/arch/x86/lib/bootm.c @@ -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