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| author | Simon Glass <sjg@chromium.org> | 2015-08-04 12:33:55 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 08:44:07 -0600 |
| commit | 6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63 (patch) | |
| tree | f487163b3e28006dbe9023ae8c6c3abfbd211461 /arch/x86/cpu/Makefile | |
| parent | 7dfe8bdeef7f8a7223fb39e04faaa5c7489feb3f (diff) | |
| download | u-boot-imx-6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63.zip u-boot-imx-6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63.tar.gz u-boot-imx-6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63.tar.bz2 | |
x86: Add a way to call 32-bit code from 64-bit mode
The procedure to drop from 64-bit mode to 32-bit is a bit messy. Add a
function to take care of it. It requires identity-mapped pages and that
the calling code is running below 4GB.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/cpu/Makefile')
| -rw-r--r-- | arch/x86/cpu/Makefile | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 5e058c0..e797925 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -12,6 +12,12 @@ extra-y = start.o obj-$(CONFIG_X86_RESET_VECTOR) += resetvec.o start16.o obj-y += interrupts.o cpu.o cpu_x86.o call64.o +AFLAGS_REMOVE_call32.o := -mregparm=3 \ + $(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32) +AFLAGS_call32.o := -fpic -fshort-wchar + +extra-y += call32.o + obj-$(CONFIG_INTEL_BAYTRAIL) += baytrail/ obj-$(CONFIG_SYS_COREBOOT) += coreboot/ obj-$(CONFIG_EFI_APP) += efi/ |