c8127e4ac9
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. Change-Id: Ia53b94ab9c6a303b979db7ff20b79e14bc51f9f8 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/203033 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#ifndef STDDEF_H
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#define STDDEF_H
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typedef long ptrdiff_t;
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#ifndef __SIZE_TYPE__
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#define __SIZE_TYPE__ unsigned long
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#endif
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typedef __SIZE_TYPE__ size_t;
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/* There is a GCC macro for a size_t type, but not
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* for a ssize_t type. Below construct tricks GCC
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* into making __SIZE_TYPE__ signed.
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*/
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#define unsigned signed
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typedef __SIZE_TYPE__ ssize_t;
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#undef unsigned
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typedef int wchar_t;
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typedef unsigned int wint_t;
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#define NULL ((void *)0)
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/* Standard units. */
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#define KiB (1<<10)
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#define MiB (1<<20)
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#define GiB (1<<30)
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/* Could we ever run into this one? I hope we get this much memory! */
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#define TiB (1<<40)
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#define check_member(structure, member, offset) _Static_assert( \
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offsetof(struct structure, member) == offset, \
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"`struct " #structure "` offset for `" #member "` is not " #offset )
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#ifdef __PRE_RAM__
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#define ROMSTAGE_CONST const
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#else
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#define ROMSTAGE_CONST
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#endif
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/* Work around non-writable data segment in execute-in-place romstage on x86. */
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#if defined(__PRE_RAM__) && CONFIG_ARCH_X86
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#define MAYBE_STATIC
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#else
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#define MAYBE_STATIC static
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#endif
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#endif /* STDDEF_H */
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