diff options
| author | Julius Werner <jwerner@chromium.org> | 2014-06-06 16:10:56 -0700 |
|---|---|---|
| committer | Marc Jones <marc.jones@se-eng.com> | 2015-03-09 22:42:28 +0100 |
| commit | dbe0df199215724ea23ccd549e5782ad18faaf7f (patch) | |
| tree | c55771852d2d3ba3c4a947fc3ceaa86a2d3b17ef /src/include/stddef.h | |
| parent | 408ebe6ad06d9929aed4681258cb4928387b83eb (diff) | |
Add and consistently use wrapper macro for romstage static variables
x86 systems run their romstage as execute-in-place from flash, which
prevents them from having writable data segments. In several code pieces
that get linked into both romstage and ramstage, this has been worked
around by using a local variable and having the 'static' storage class
guarded by #ifndef __PRE_RAM__.
However, x86 is the only architecture using execute-in-place (for now),
so it does not make sense to impose the restriction globally. Rather
than fixing the #ifdef at every occurrence, this should really be
wrapped in a way that makes it easier to modify in a single place. The
chromeos/cros_vpd.c file already had a nice approach for a wrapper
macro, but unfortunately restricted it to one file... this patch moves
it to stddef.h and employs it consistently throughout coreboot.
BRANCH=nyan
BUG=None
TEST=Measured boot time on Nyan_Big before and after, confirmed that it
gained 6ms from caching the FMAP in vboot_loader.c.
Original-Change-Id: Ia53b94ab9c6a303b979db7ff20b79e14bc51f9f8
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/203033
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
(cherry picked from commit c8127e4ac9811517f6147cf019ba6a948cdaa4a5)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: I44dacc10214351992b775aca52d6b776a74ee922
Reviewed-on: http://review.coreboot.org/8055
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/include/stddef.h')
| -rw-r--r-- | src/include/stddef.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/stddef.h b/src/include/stddef.h index 3a030e14a1..60e34595ee 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -49,4 +49,11 @@ typedef unsigned int wint_t; #define ROMSTAGE_CONST #endif +/* Work around non-writable data segment in execute-in-place romstage on x86. */ +#if defined(__PRE_RAM__) && CONFIG_ARCH_X86 +#define MAYBE_STATIC +#else +#define MAYBE_STATIC static +#endif + #endif /* STDDEF_H */ |