[coreboot-gerrit] Change in coreboot[master]: mmio: Use unsigned types for bit operations

[Hung-Te Lin (Code Review)]

Hello Huayang Duan, build bot (Jenkins), Julius Werner,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/40404

to look at the new patch set (#4).

Change subject: mmio: Use unsigned types for bit operations
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mmio: Use unsigned types for bit operations

When declaring bit fields with 31 bits (e.g: DEFINE_BITFIELD(MYREG, 30, 0) )
the calculation of mask value will go overflow (
 "error: integer overflow in expression '-2147483648 - 1' of type 'int'
  Results in '2147483647'").

And for bit fields with 32 bits (e.g: DEFINE_BITFIELD(MYREG, 31, 0) )
the error will be:
 "error: left shift count >= width of type [-Werror=shift-count-overflow]"

To fix these issues, we want to bit field macros to always use unsigned
integers, and use 64bit integer when creating mask value.

Change-Id: Ie3cddf9df60b83de4e21243bfde6b79729fb06ef
Signed-off-by: Hung-Te Lin 
---
M src/include/device/mmio.h
1 file changed, 2 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/40404/4