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Kconfig add config ERR_PTR_OFFSET

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Some U-Boot pointers have redundant information, so we can use a scheme
where we can return either an error code or a pointer with the same
return value. The default implementation just casts the pointer to a
number, however, this may fail on platforms where the end of the address
range is used for valid pointers (e.g. 0xffffff00 is a valid heap pointer
in socfpga SPL). For such platforms, this value provides an upper range
of those error pointer values - up to 'MAX_ERRNO' bytes below this value
must be unused/invalid addresses.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Simon Goldschmidt 2019-10-22 21:29:46 +02:00 committed by Tom Rini
parent 37e66ba916
commit 93db2b83ed
1 changed files with 14 additions and 0 deletions
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14
Kconfig
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@ -281,6 +281,20 @@ config SYS_LDSCRIPT
Path within the source tree to the linker script to use for the
main U-Boot binary.
config ERR_PTR_OFFSET
hex
default 0x0
help
Some U-Boot pointers have redundant information, so we can use a
scheme where we can return either an error code or a pointer with the
same return value. The default implementation just casts the pointer
to a number, however, this may fail on platforms where the end of the
address range is used for valid pointers (e.g. 0xffffff00 is a valid
heap pointer in socfpga SPL).
For such platforms, this value provides an upper range of those error
pointer values - up to 'MAX_ERRNO' bytes below this value must be
unused/invalid addresses.
endmenu # General setup
menu "Boot images"