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>

diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
index 7f89ff0..f0135a7 100644 (file)
--- 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 e5e63f6..3c3d9e1 100644 (file)
--- 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