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\ Hypervisor Software File: initdict.fth
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id: @(#)initdict.fth 2.18 03/12/08 13:22:40
copyright: Copyright 1990-2003 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
\ For use in virtual-memory systems in which the Forth dictionary does
\ not have memory preallocated to it, this file establishes a mechanism
\ for allocating physical memory to the dictionary "on demand".
\ Called when ALLOT can't satisfy the request. Allocates some more
\ physical memory for the dictionary, maps it in, and updates limit
\ to include the new memory.
h# 1.0000 constant /dictionary-growth \ 64K chosen to reduce map calls
\ Return a "success" indication if called when the dictionary already
\ Restriction: both parameters must be mmu-aligned
: extend-dict-phys ( old-top-adr size' -- )
dup /dictionary-growth ( old-top size' size' alignment )
mem-claim ( old-top size' p.lo p.hi )
2swap ( p.lo p.hi old-top=start-addr size' )
: extend-dictionary ( size -- size )
dup pad + d# 100 + ( size top-adr )
/dictionary-growth round-up ( size new-top-adr )
dup dictionary-top > if allot-abort then ( size new-top-adr )
limit ( size new-top-adr old-top-adr )
\ We didn't expect to call this routine unless we're about
\ to run out of space, but it's more robust this way...
2drop exit \ Retreat and claim victory.
( size new-top-adr old-top-adr )
2dup - ( size new-top-adr old-top-adr size' )
extend-dict-phys ( size new-top-adr )
\ The in-dictionary? function is used to validate an
\ instruction-pointer or the occurrence of a token in a
\ colon-definition. But if set to point to origin it
\ can get tripped up, for instance, when the trap-table
\ address was put on the return-stack and ftrace is run.
\ Instead, point it to the first code-definition in the
\ dictionary, which, after all, is the *real* start of
\ the area where valid IPs or tokens can begin.
['] extend-dictionary is allot-error
['] origin is lo-segment-base
['] origin is lo-segment-limit
['] first-code-word is hi-segment-base
\ XXX Later, we may change first-code-word to low-dictionary-adr
['] here is hi-segment-limit
stand-init: Init Dictionary
projects / OpenSPARC-T2-SAM / blob