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| author | Vincent Palatin <vpalatin@chromium.org> | 2018-03-02 11:17:11 +0100 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-03-05 23:48:28 -0800 |
| commit | b42dd73603844c03b44d88a4513df330ee168496 (patch) | |
| tree | 3fc605851bb6049e59fe44676c62c26db6e4a8fd /include/link_defs.h | |
| parent | 6d567bc45ffcc3b8df2c288f8347d00a250248fc (diff) | |
| download | chrome-ec-b42dd73603844c03b44d88a4513df330ee168496.tar.gz | |
core: add chip-specific memory regions definition mechanism
When a chip has special/non-contiguous SRAM physical memory region,
rather than extending the generic linker file ad nauseam, define a
mechanism to declare a chip specific list of those regions.
To do so, a chip must declare the CONFIG_CHIP_MEMORY_REGIONS
configuration and have a memory_regions.inc with the list of regions.
The special-purpose preprocessed chip/<chip_name>/memory_regions.inc
file has one region declaration per line using the following macro:
REGION(name, attributes, start_address, size)
Each region will get a proper MEMORY entry and a section in the linker
file.
the __SECTION(region_name) helper is provided as a convenience to
declare variable in a specific region.
Note: those 'special' regions are NOT cleared at startup contrary to
.bss.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BRANCH=none
BUG=b:67081508
TEST=on ZerbleBarn, along with the following CLs, run the firmware with
large arrays in special AHB memory regions.
Change-Id: I3f156ef6e5feb4a6a0b2ae2468bae8a20483f17c
Reviewed-on: https://chromium-review.googlesource.com/946368
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'include/link_defs.h')
| -rw-r--r-- | include/link_defs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/link_defs.h b/include/link_defs.h index c12a350924..f27651691c 100644 --- a/include/link_defs.h +++ b/include/link_defs.h @@ -104,4 +104,11 @@ extern const void *__ro_end; extern const void *__data_start; extern const void *__data_end; +/* Helper for special chip-specific memory sections */ +#ifdef CONFIG_CHIP_MEMORY_REGIONS +#define __SECTION(name) __attribute__((section("." STRINGIFY(name) ".50_auto"))) +#else +#define __SECTION(name) +#endif /* CONFIG_MEMORY_REGIONS */ + #endif /* __CROS_EC_LINK_DEFS_H */ |