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| author | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 20:22:24 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 20:41:43 +0200 |
| commit | 433de739bbc22a5b2c87602116566ce27e3b4cab (patch) | |
| tree | 80ff7967acf662d915fb4a34466653fba4d509e2 /arch/x86/realmode | |
| parent | Linux 3.4-rc6 (diff) | |
| download | linux-433de739bbc22a5b2c87602116566ce27e3b4cab.tar.xz linux-433de739bbc22a5b2c87602116566ce27e3b4cab.zip | |
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 scripts/x86-relocs.c so it will
be compiled before building the arch/x86 tree.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-2-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/realmode')
0 files changed, 0 insertions, 0 deletions