path: root/arch/x86/Makefile
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authorH. Peter Anvin <>2012-05-08 18:22:24 (GMT)
committerH. Peter Anvin <>2012-05-19 02:49:40 (GMT)
commit6520fe5564acf07ade7b18a1272db1184835c487 (patch)
tree363c95dea4c9202c2fbe1ebcfd9dd7b97c7422ac /arch/x86/Makefile
parent36be50515fe2aef61533b516fa2576a2c7fe7664 (diff)
x86, realmode: 16-bit real-mode code support for relocs tool
A new option is added to the relocs tool called '--realmode'. This option causes the generation of 16-bit segment relocations and 32-bit linear relocations for the real-mode code. When the real-mode code is moved to the low-memory during kernel initialization, these relocation entries can be used to relocate the code properly. In the assembly code 16-bit segment relocations must be relative to the 'real_mode_seg' absolute symbol. Linear relocations must be relative to a symbol prefixed with 'pa_'. 16-bit segment relocation is used to load cs:ip in 16-bit code. Linear relocations are used in the 32-bit code for relocatable data references. They are declared in the linker script of the real-mode code. The relocs tool is moved to arch/x86/tools/relocs.c, and added new target archscripts that can be used to build scripts needed building an architecture. be compiled before building the arch/x86 tree. [ hpa: accelerating this because it detects invalid absolute relocations, a serious bug in binutils which currently produces bad kernels. ] Signed-off-by: H. Peter Anvin <> Link: Signed-off-by: Jarkko Sakkinen <> Signed-off-by: H. Peter Anvin <> Cc: <>
Diffstat (limited to 'arch/x86/Makefile')
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 41a7237..94e91e4 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -134,6 +134,9 @@ KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
KBUILD_CFLAGS += $(mflags-y)
KBUILD_AFLAGS += $(mflags-y)
+ $(Q)$(MAKE) $(build)=arch/x86/tools relocs
# Syscall table generation