[openfirmware] r1702 - cpu/x86
svn at openfirmware.info
svn at openfirmware.info
Tue Jan 26 08:15:41 CET 2010
Author: wmb
Date: 2010-01-26 08:15:41 +0100 (Tue, 26 Jan 2010)
New Revision: 1702
Added:
cpu/x86/bootascall.fth
Log:
Checked in bootascall.fth
Added: cpu/x86/bootascall.fth
===================================================================
--- cpu/x86/bootascall.fth (rev 0)
+++ cpu/x86/bootascall.fth 2010-01-26 07:15:41 UTC (rev 1702)
@@ -0,0 +1,121 @@
+\ See license at end of file
+purpose: Return from "booted" programs as if they were Forth words
+
+variable rp-var
+variable sp-var
+rs-size buffer: rs-buf
+ps-size buffer: ps-buf
+
+code save-forth-state ( -- )
+ cld
+ \ Copy the entire Forth data stack and return stack areas to a save area.
+
+ si bx mov \ Save SI
+ di dx mov \ Save UP
+
+ \ Data Stack
+ esp 'user sp-var mov
+
+ 'user sp0 si mov
+ 'user ps-buf di mov \ Address of data stack save area
+ ps-size # si sub \ Bottom of data stack area (in longwords)
+
+ ps-size 4 / # cx mov \ Size of data stack area
+ rep movs
+
+ dx di mov \ Restore DI
+
+ \ Return Stack
+
+ ebp 'user rp-var mov
+
+ 'user rp0 si mov
+ 'user rs-buf di mov \ Address of return stack save area
+ rs-size # si sub \ Bottom of return stack area
+
+ rs-size 4 / # cx mov \ Size of return stack area (in longwords)
+ rep movs
+
+ dx di mov \ Restore DI
+
+ bx si mov \ Restore SI
+c;
+
+: undo-boot-return ( -- )
+ ['] (quit) to user-interface
+;
+
+code resume-forth-state ( -- )
+ cli cld
+
+ di dx mov \ Save UP
+
+ \ Copy the entire Forth data stack and return stack areas to a save area.
+
+ \ Data Stack (load si first because di is the user pointer!)
+ 'user sp-var esp mov \ Data stack pointer
+
+ 'user ps-buf si mov \ Address of data stack save area
+ 'user sp0 di mov \ Top of data stack areas
+ ps-size # di sub \ Bottom of data stack area (in longwords)
+
+ ps-size 4 / # cx mov \ Size of data stack area
+ rep movs
+
+ dx di mov \ Restore UP
+
+ \ Return Stack (load si first because di is the user pointer!)
+
+ 'user rp-var ebp mov \ Return stack pointer
+
+ 'user rs-buf si mov \ Address of return stack save area
+ 'user rp0 di mov \ Top of return stack area
+ rs-size # di sub \ Bottom of return stack area
+
+ rs-size 4 / # cx mov \ Size of return stack area (in longwords)
+ rep movs
+
+ dx di mov \ Restore UP
+ sti
+
+ 0 [ebp] esi mov \ Pop the return stack into the interpreter pointer
+ 4 # ebp add
+c;
+
+0 value saved-go-hook
+: boot-as-call( ( -- )
+ ps-buf drop rs-buf drop
+ ['] go-hook behavior to saved-go-hook
+ ['] save-forth-state to go-hook
+ ['] resume-forth-state to user-interface
+;
+: )boot-as-call ( -- )
+ saved-go-hook to go-hook
+ ['] (quit) to user-interface
+;
+ps-buf drop rs-buf drop
+: foo boot-as-call( emacs )boot-as-call cr ." Hello" cr ;
+
+\ LICENSE_BEGIN
+\ Copyright (c) 2010 FirmWorks
+\
+\ Permission is hereby granted, free of charge, to any person obtaining
+\ a copy of this software and associated documentation files (the
+\ "Software"), to deal in the Software without restriction, including
+\ without limitation the rights to use, copy, modify, merge, publish,
+\ distribute, sublicense, and/or sell copies of the Software, and to
+\ permit persons to whom the Software is furnished to do so, subject to
+\ the following conditions:
+\
+\ The above copyright notice and this permission notice shall be
+\ included in all copies or substantial portions of the Software.
+\
+\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+\
+\ LICENSE_END
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