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Added the functions from em.h
git-svn-id: svn://svn.cc65.org/cc65/trunk@1720 b7a2c559-68d2-44c3-8de9-860c34a00d81
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doc/funcref.sgml
234
doc/funcref.sgml
@ -122,6 +122,20 @@ function.
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</itemize>
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<sect1><tt/em.h/<label id="em.h"><p>
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<itemize>
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<item><ref id="em_commit" name="em_commit">
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<item><ref id="em_copyfrom" name="em_copyfrom">
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<item><ref id="em_copyto" name="em_copyto">
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<item><ref id="em_load_driver" name="em_load_driver">
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<item><ref id="em_map" name="em_map">
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<item><ref id="em_pagecount" name="em_pagecount">
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<item><ref id="em_unload" name="em_unload">
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<item><ref id="em_use" name="em_use">
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</itemize>
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<sect1><tt/stdlib.h/<label id="stdlib.h"><p>
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<itemize>
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@ -549,6 +563,226 @@ used in presence of a prototype.
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</quote>
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<sect1>em_commit<label id="em_commit"><p>
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<quote>
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<descrip>
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<tag/Function/Commit changes into extended memory.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void __fastcall__ em_commit (void);/
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<tag/Description/Commit changes in the memory window to extended storage. If
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the contents of the memory window have been changed, these changes may be lost
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if <tt/<ref id="em_map" name="em_map">/, <tt/<ref id="em_use" name="em_use">/,
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<tt/<ref id="em_copyfrom" name="em_copyfrom">/ or <tt/<ref id="em_copyto"
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name="em_copyto">/ are called without calling <tt/em_commit/ first.
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<tag/Limits/<itemize>
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<item>Calling <tt/em_commit/ does not necessarily mean that changes to the
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memory window are discarded, it does just mean that the drivers is allowed
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to discard it.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The function produces undefined results if no extended memory driver is
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loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_load_driver" name="em_load_driver">,
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<ref id="em_map" name="em_map">,
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<ref id="em_use" name="em_use">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_copyfrom<label id="em_copyfrom"><p>
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<quote>
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<descrip>
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<tag/Function/Copy from extended into normal memory.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void __fastcall__ em_copyfrom (const struct em_copy* copy_data);/
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<tag/Description/Copy data from extended memory into linear memory. Source and
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target addresses as well as the number of bytes to transfer are specified in
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the <tt/em_copy/ structure that is passed as a parameter.
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<tag/Limits/<itemize>
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<item>Calling <tt/em_copyfrom/ will invalidate the memory window, so if you
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made any changes to the data in the window, call <tt/<ref id="em_commit"
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name="em_commit">/ first, or the changes are lost.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The function produces undefined results if no extended memory driver is
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loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_commit" name="em_commit">,
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<ref id="em_copyto" name="em_copyto">,
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<ref id="em_load_driver" name="em_load_driver">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_copyto<label id="em_copyto"><p>
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<quote>
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<descrip>
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<tag/Function/Copy from normal into extended memory.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void __fastcall__ em_copyto (const struct em_copy* copy_data);/
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<tag/Description/Copy data from linear into extended memory. Source and
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target addresses as well as the number of bytes to transfer are specified in
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the <tt/em_copy/ structure that is passed as a parameter.
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<tag/Limits/<itemize>
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<item>Calling <tt/em_copyto/ will invalidate the memory window, so if you
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made any changes to the data in the window, call <tt/<ref id="em_commit"
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name="em_commit">/ first, or the changes are lost.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The function produces undefined results if no extended memory driver is
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loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_commit" name="em_commit">,
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<ref id="em_copyfrom" name="em_copyfrom">,
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<ref id="em_load_driver" name="em_load_driver">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_load_driver<label id="em_load_driver"><p>
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<quote>
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<descrip>
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<tag/Function/Load and initialize an extended memory driver.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void __fastcall__ em_load_driver (const char* name);/
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<tag/Description/Load an extended memory driver into memory and initialize
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it. The function returns an error code that tells if all this has been
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successful.
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<tag/Limits/<itemize>
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<item>Not all drivers are able to detect if the supported hardware is really
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present.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The driver is loaded by name, so currently you must know the type of
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extended memory that should be supported. There is no autodetect capability.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_unload" name="em_unload">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_map<label id="em_map"><p>
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<quote>
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<descrip>
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<tag/Function/Make a page of extended memory accessible.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void* __fastcall__ em_map (unsigned page);/
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<tag/Description/The function maps one page of extended memory into linear
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memory and returns a pointer to the page frame. Depending on the hardware
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and driver, the data is either mapped into the address space or transfered
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into a buffer. If you don't need the actual contents of the page (for example
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because you're going to overwrite it completely, it is better to call
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<tt/<ref id="em_use" name="em_use">/ instead. <tt/em_use/ will not transfer the
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data if it is possible to avoid that.
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<tag/Limits/<itemize>
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<item>Calling <tt/em_map/ will invalidate the memory window, so if you
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made any changes to the data in the window, call <tt/<ref id="em_commit"
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name="em_commit">/ first, or the changes are lost.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The function produces undefined results if no extended memory driver is
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loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_commit" name="em_commit">,
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<ref id="em_load_driver" name="em_load_driver">,
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<ref id="em_use" name="em_use">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_pagecount<label id="em_pagecount"><p>
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<quote>
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<descrip>
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<tag/Function/Return the number of available extended memory pages.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/unsigned __fastcall__ em_pagecount (void);/
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<tag/Description/The function returns the size of the extended memory supported
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by the driver in 256 byte pages.
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<tag/Limits/<itemize>
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<item>The function returns zero if no extended memory driver is loaded.
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<item>The function may return zero if the supported hardware was not detected.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_load_driver" name="em_load_driver">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_unload<label id="em_unload"><p>
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<quote>
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<descrip>
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<tag/Function/Unload an extended memory driver.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void __fastcall__ em_unload (void);/
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<tag/Description/The function unloads a loaded extended memory driver and
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frees all memory allocated for the driver.
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<tag/Limits/<itemize>
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<item>The function does nothing if no driver is loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_load_driver" name="em_load_driver">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>em_use<label id="em_use"><p>
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<quote>
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<descrip>
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<tag/Function/Prepare an extended memory page for use.
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<tag/Header/<tt/<ref id="em.h" name="em.h">/
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<tag/Declaration/<tt/void* __fastcall__ em_use (unsigned page);/
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<tag/Description/The function maps one page of extended memory into linear
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memory and returns a pointer to the page frame. This function is similar to
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<tt/<ref id="em_map" name="em_map">/, but will not transfer data into the
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actual memory window in the assumption that the existing data is wrong or
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will get overwritten.
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<tag/Limits/<itemize>
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<item>Calling <tt/em_use/ will invalidate the memory window, so if you
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made any changes to the data in the window, call <tt/<ref id="em_commit"
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name="em_commit">/ first, or the changes are lost.
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<item>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.
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<item>The function produces undefined results if no extended memory driver is
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loaded.
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</itemize>
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<tag/Availability/cc65
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<tag/See also/
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<ref id="em_commit" name="em_commit">,
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<ref id="em_load_driver" name="em_load_driver">,
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<ref id="em_map" name="em_map">
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>exit<label id="exit"><p>
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<quote>
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