sravan/system76-coreboot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

memlayout: Store region sizes as separate symbols

Browse Source 
This patch changes the memlayout macro infrastructure so that the size
of a region "xxx" (i.e. the distance between the symbols _xxx and _exxx)
is stored in a separate _xxx_size symbol. This has the advantage that
region sizes can be used inside static initializers, and also saves an
extra subtraction at runtime. Since linker symbols can only be treated
as addresses (not as raw integers) by C, retain the REGION_SIZE()
accessor macro to hide the necessary typecast.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ifd89708ca9bd3937d0db7308959231106a6aa373
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49332
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Julius Werner
2020-12-30 15:51:10 -08:00
committed by Patrick Georgi
parent 422501fb14
commit 82d16b150c
19 changed files with 76 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/include/symbols.h
View File

@@ -7,11 +7,12 @@
extern u8 _dram[];
#define REGION_SIZE(name) (_e##name - _##name)
#define REGION_SIZE(name) ((size_t)_##name##_size)
#define DECLARE_REGION(name) \
extern u8 _##name[]; \
extern u8 _e##name[];
extern u8 _e##name[]; \
extern u8 _##name##_size[];
/*
* Regions can be declared optional if not all configurations provide them in
@@ -23,7 +24,8 @@ extern u8 _dram[];
*/
#define DECLARE_OPTIONAL_REGION(name) \
__weak extern u8 _##name[]; \
__weak extern u8 _e##name[];
__weak extern u8 _e##name[]; \
__weak extern u8 _##name##_size[];
DECLARE_REGION(sram)
DECLARE_OPTIONAL_REGION(timestamp)