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Enable customizing PageShift to set PageSize for embedded targets (#19129)

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* Enable customizing PageSize (via PageShift).

This enables adjusting PageSize for embedded targets without abusing
cpu16.

* copy nimPageXYZ settings for mmpaptest

* add docs for Nim manual

* add docs for Nim manual

* docs tweaks

Co-authored-by: Jaremy Creechley <jaremy.creechley@panthalassa.com>
(cherry picked from commit 92d6fb86c6)
This commit is contained in:
Jaremy Creechley
2021-11-16 11:30:07 -08:00
committed by narimiran
parent 1dc47696c0
commit b9363c8bb4
3 changed files with 36 additions and 5 deletions
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10
lib/system/bitmasks.nim
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@@ -10,14 +10,18 @@
# Page size of the system; in most cases 4096 bytes. For exotic OS or
# CPU this needs to be changed:
const
PageShift = when defined(cpu16): 8 else: 12 # \
# my tests showed no improvements for using larger page sizes.
PageShift = when defined(nimPage256) or defined(cpu16): 8
elif defined(nimPage512): 9
elif defined(nimPage1k): 10
else: 12 # \ # my tests showed no improvements for using larger page sizes.
PageSize = 1 shl PageShift
PageMask = PageSize-1
MemAlign = # also minimal allocatable memory block
when defined(useMalloc):
when defined(nimMemAlignTiny): 4
elif defined(useMalloc):
when defined(amd64): 16
else: 8
else: 16