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1 588 jeremybenn 
/******************************************************************************
2 
  FILE        : datapage.c
3 
  PURPOSE     : paged data access runtime routines
4 
  MACHINE     : Motorola 68HC12 (Target)
5 
  LANGUAGE    : ANSI-C
6 
  HISTORY     : 21.7.96 first version created
7 
******************************************************************************/
8 
 
9 
/*
10 
   According to the -Cp option of the compiler the
11 
   __DPAGE__, __PPAGE__ and __EPAGE__ macros are defined.
12 
   If none of them is given as argument, then no page accesses should occur and
13 
   this runtime routine should not be used !
14 
   To be on the save side, the runtime routines are created anyway.
15 
   If some of the -Cp options are given an adapted versions which only covers the
16 
   needed cases is produced.
17 
*/
18 
 
19 
/* if no compiler option -Cp is given, it is assumed that all possible are given : */
20 
 
21 
/* Compile with option -DHCS12 to activate this code */
22 
#if defined(HCS12) || defined(_HCS12) /* HCS12 family has PPAGE register only at 0x30 */
23 
#define PPAGE_ADDR (0x30+REGISTER_BASE)
24 
#ifndef __PPAGE__ /* may be set already by option -CPPPAGE */
25 
#define __PPAGE__
26 
#endif
27 
/* Compile with option -DDG128 to activate this code */
28 
#elif defined DG128 /* HC912DG128 derivative has PPAGE register only at 0xFF */
29 
#define PPAGE_ADDR (0xFF+REGISTER_BASE)
30 
#ifndef __PPAGE__ /* may be set already by option -CPPPAGE */
31 
#define __PPAGE__
32 
#endif
33 
#elif defined(HC812A4)
34 
/* all setting default to A4 already */
35 
#endif
36 
 
37 
 
38 
#if !defined(__EPAGE__) && !defined(__PPAGE__) && !defined(__DPAGE__)
39 
/* as default use all page registers */
40 
#define __DPAGE__
41 
#define __EPAGE__
42 
#define __PPAGE__
43 
#endif
44 
 
45 
/* modify the following defines to your memory configuration */
46 
 
47 
#define EPAGE_LOW_BOUND   0x400u
48 
#define EPAGE_HIGH_BOUND  0x7ffu
49 
 
50 
#define DPAGE_LOW_BOUND   0x7000u
51 
#define DPAGE_HIGH_BOUND  0x7fffu
52 
 
53 
#define PPAGE_LOW_BOUND   (DPAGE_HIGH_BOUND+1)
54 
#define PPAGE_HIGH_BOUND  0xBFFFu
55 
 
56 
#define REGISTER_BASE      0x0u
57 
#ifndef DPAGE_ADDR
58 
#define DPAGE_ADDR        (0x34u+REGISTER_BASE)
59 
#endif
60 
#ifndef EPAGE_ADDR
61 
#define EPAGE_ADDR        (0x36u+REGISTER_BASE)
62 
#endif
63 
#ifndef PPAGE_ADDR
64 
#define PPAGE_ADDR        (0x35u+REGISTER_BASE)
65 
#endif
66 
 
67 
/*
68 
  The following parts about the defines are assumed in the code of _GET_PAGE_REG :
69 
  - the memory region controlled by DPAGE is above the area controlled by the EPAGE and
70 
    below the area controlled by the PPAGE.
71 
  - the lower bound of the PPAGE area is equal to be the higher bound of the DPAGE area + 1
72 
*/
73 
#if EPAGE_LOW_BOUND >= EPAGE_HIGH_BOUND || EPAGE_HIGH_BOUND >= DPAGE_LOW_BOUND || DPAGE_LOW_BOUND >= DPAGE_HIGH_BOUND || DPAGE_HIGH_BOUND >= PPAGE_LOW_BOUND || PPAGE_LOW_BOUND >= PPAGE_HIGH_BOUND
74 
#error /* please adapt _GET_PAGE_REG for this non default page configuration */
75 
#endif
76 
 
77 
#if DPAGE_HIGH_BOUND+1 != PPAGE_LOW_BOUND
78 
#error /* please adapt _GET_PAGE_REG for this non default page configuration */
79 
#endif
80 
 
81 
#include "hidef.h"
82 
#include "non_bank.sgm"
83 
#include "runtime.sgm"
84 
 
85 
/* this module does either control if any access is in the bounds of the specified page or */
86 
/* ,if only one page is specified, just use this page. */
87 
/* This behavior is controlled by the define USE_SEVERAL_PAGES. */
88 
/* If !USE_SEVERAL_PAGES does increase the performance significantly */
89 
/* NOTE : When !USE_SEVERAL_PAGES, the page is also set for accesses outside of the area controlled */
90 
/*        by this single page. But this is usually no problem because the page is set again before any other access */
91 
 
92 
#if !defined(__DPAGE__) && !defined(__EPAGE__) && !defined(__PPAGE__)
93 
/* no page at all is specified */
94 
/* only specifing the right pages will speed up these functions a lot */
95 
#define USE_SEVERAL_PAGES 1
96 
#elif defined(__DPAGE__) && defined(__EPAGE__) || defined(__DPAGE__) && defined(__PPAGE__) || defined(__EPAGE__) && defined(__PPAGE__)
97 
/* more than one page register is used */
98 
#define USE_SEVERAL_PAGES 1
99 
#else
100 
 
101 
#define USE_SEVERAL_PAGES 0
102 
 
103 
#if defined(__DPAGE__) /* check which pages are used  */
104 
#define PAGE_ADDR PPAGE_ADDR
105 
#elif defined(__EPAGE__)
106 
#define PAGE_ADDR EPAGE_ADDR
107 
#elif defined(__PPAGE__)
108 
#define PAGE_ADDR PPAGE_ADDR
109 
#else /* we dont know which page, decide it at runtime */
110 
#error /* must not happen */
111 
#endif
112 
 
113 
#endif
114 
 
115 
 
116 
#if USE_SEVERAL_PAGES /* only needed for several pages support */
117 
/*--------------------------- _GET_PAGE_REG --------------------------------
118 
  Runtime routine to detect the right register depending on the 16 bit offset part
119 
  of an address.
120 
  This function is only used by the functions below.
121 
 
122 
  Depending on the compiler options -Cp different versions of _GET_PAGE_REG are produced.
123 
 
124 
  Arguments :
125 
  - Y : offset part of an address
126 
 
127 
  Result :
128 
  if address Y is controlled by a page register :
129 
  - X : address of page register if Y is controlled by an page register
130 
  - Zero flag cleared
131 
  - all other registers remain unchanged
132 
 
133 
  if address Y is not controlled by a page register :
134 
  - Zero flag is set
135 
  - all registers remain unchanged
136 
 
137 
  --------------------------- _GET_PAGE_REG ----------------------------------*/
138 
 
139 
#if defined(__DPAGE__)
140 
 
141 
#ifdef __cplusplus
142 
extern "C"
143 
#endif
144 
#pragma NO_ENTRY
145 
#pragma NO_EXIT
146 
#pragma NO_FRAME
147 
 
148 
static void NEAR _GET_PAGE_REG(void) { /*lint -esym(528, _GET_PAGE_REG) used in asm code */
149 
  asm {
150 
L_DPAGE:
151 
        CPY  #DPAGE_LOW_BOUND     ; test of lower bound of DPAGE
152 
#if defined(__EPAGE__)
153 
        BLO  L_EPAGE              ; EPAGE accesses are possible
154 
#else
155 
        BLO  L_NOPAGE             ; no paged memory below accesses
156 
#endif
157 
        CPY  #DPAGE_HIGH_BOUND    ; test of higher bound DPAGE/lower bound PPAGE
158 
#if defined(__PPAGE__)
159 
        BHI  L_PPAGE              ; EPAGE accesses are possible
160 
#else
161 
        BHI  L_NOPAGE             ; no paged memory above accesses
162 
#endif
163 
FOUND_DPAGE:
164 
        LDX  #DPAGE_ADDR          ; load page register address and clear zero flag
165 
        RTS
166 
 
167 
#if defined(__PPAGE__)
168 
L_PPAGE:
169 
        CPY  #PPAGE_HIGH_BOUND    ; test of higher bound of PPAGE
170 
        BHI  L_NOPAGE
171 
FOUND_PPAGE:
172 
        LDX  #PPAGE_ADDR          ; load page register address and clear zero flag
173 
        RTS
174 
#endif
175 
 
176 
#if defined(__EPAGE__)
177 
L_EPAGE:
178 
        CPY #EPAGE_LOW_BOUND      ; test of lower bound of EPAGE
179 
        BLO L_NOPAGE
180 
        CPY #EPAGE_HIGH_BOUND     ; test of higher bound of EPAGE
181 
        BHI L_NOPAGE
182 
 
183 
FOUND_EPAGE:
184 
        LDX #EPAGE_ADDR           ; load page register address and clear zero flag
185 
        RTS
186 
#endif
187 
 
188 
L_NOPAGE:
189 
        ORCC #0x04                ; sets zero flag
190 
        RTS
191 
  }
192 
}
193 
 
194 
#else /* !defined(__DPAGE__) */
195 
 
196 
#if defined( __PPAGE__ )
197 
 
198 
#ifdef __cplusplus
199 
extern "C"
200 
#endif
201 
#pragma NO_ENTRY
202 
#pragma NO_EXIT
203 
#pragma NO_FRAME
204 
 
205 
static void NEAR _GET_PAGE_REG(void) {  /*lint -esym(528, _GET_PAGE_REG) used in asm code */
206 
  asm {
207 
L_PPAGE:
208 
        CPY  #PPAGE_LOW_BOUND     ; test of lower bound of PPAGE
209 
#if defined( __EPAGE__ )
210 
        BLO  L_EPAGE
211 
#else
212 
        BLO  L_NOPAGE             ; no paged memory below
213 
#endif
214 
        CPY  #PPAGE_HIGH_BOUND    ; test of higher bound PPAGE
215 
        BHI  L_NOPAGE
216 
FOUND_PPAGE:
217 
        LDX  #PPAGE_ADDR          ; load page register address and clear zero flag
218 
        RTS
219 
#if defined( __EPAGE__ )
220 
L_EPAGE:
221 
        CPY #EPAGE_LOW_BOUND      ; test of lower bound of EPAGE
222 
        BLO L_NOPAGE
223 
        CPY #EPAGE_HIGH_BOUND     ; test of higher bound of EPAGE
224 
        BHI L_NOPAGE
225 
FOUND_EPAGE:
226 
        LDX #EPAGE_ADDR           ; load page register address and clear zero flag
227 
        RTS
228 
#endif
229 
 
230 
L_NOPAGE:                         ; not in any allowed page area
231 
                                  ; its a far access to a non paged variable
232 
        ORCC #0x04                ; sets zero flag
233 
        RTS
234 
  }
235 
}
236 
 
237 
#else /* !defined(__DPAGE__ ) && !defined( __PPAGE__) */
238 
#if defined(__EPAGE__)
239 
 
240 
#ifdef __cplusplus
241 
extern "C"
242 
#endif
243 
#pragma NO_ENTRY
244 
#pragma NO_EXIT
245 
#pragma NO_FRAME
246 
 
247 
static void NEAR _GET_PAGE_REG(void) { /*lint -esym(528, _GET_PAGE_REG) used in asm code */
248 
  asm {
249 
L_EPAGE:
250 
        CPY #EPAGE_LOW_BOUND      ; test of lower bound of EPAGE
251 
        BLO L_NOPAGE
252 
        CPY #EPAGE_HIGH_BOUND     ; test of higher bound of EPAGE
253 
        BHI L_NOPAGE
254 
FOUND_EPAGE:
255 
        LDX #EPAGE_ADDR           ; load page register address and clear zero flag
256 
        RTS
257 
 
258 
L_NOPAGE:                         ; not in any allowed page area
259 
                                  ; its a far access to a non paged variable
260 
        ORCC #0x04                ; sets zero flag
261 
        RTS
262 
  }
263 
}
264 
 
265 
#endif /*  defined(__EPAGE__) */
266 
#endif /*  defined(__PPAGE__) */
267 
#endif /*  defined(__DPAGE__) */
268 
 
269 
#endif /* USE_SEVERAL_PAGES */
270 
 
271 
/*--------------------------- _SET_PAGE --------------------------------
272 
  Runtime routine to set the right page register. This routine is used if the compiler
273 
  does not know the right page register, i.e. if the option -Cp is used for more than
274 
  one pageregister or if the runtime option is used for one of the -Cp options.
275 
 
276 
  Arguments :
277 
  - offset part of an address in the Y register
278 
  - page part of an address in the B register
279 
 
280 
  Result :
281 
  - page part written into the correct page register.
282 
  - the old page register content is destroyed
283 
  - all processor registers remains unchanged
284 
  --------------------------- _SET_PAGE ----------------------------------*/
285 
 
286 
#ifdef __cplusplus
287 
extern "C"
288 
#endif
289 
#pragma NO_ENTRY
290 
#pragma NO_EXIT
291 
#pragma NO_FRAME
292 
 
293 
void NEAR _SET_PAGE(void) {
294 
#if USE_SEVERAL_PAGES
295 
  asm {
296 
          PSHX                  ; save X register
297 
          __PIC_JSR(_GET_PAGE_REG)
298 
          BEQ    L_NOPAGE
299 
          STAB   0,X            ; set page register
300 
L_NOPAGE:
301 
          PULX                  ; restore X register
302 
          RTS
303 
  }
304 
#else /* USE_SEVERAL_PAGES */
305 
  asm {
306 
          STAB   PAGE_ADDR      ; set page register
307 
          RTS
308 
  }
309 
#endif /* USE_SEVERAL_PAGES */
310 
}
311 
 
312 
/*--------------------------- _LOAD_FAR_8 --------------------------------
313 
  This runtime routine is used to access paged memory via a runtime function.
314 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
315 
 
316 
  Arguments :
317 
  - offset part of an address in the Y register
318 
  - page part of an address in the B register
319 
 
320 
  Result :
321 
  - value to be read in the B register
322 
  - all other registers remains unchanged
323 
  - all page register still contain the same value
324 
  --------------------------- _LOAD_FAR_8 ----------------------------------*/
325 
 
326 
#ifdef __cplusplus
327 
extern "C"
328 
#endif
329 
#pragma NO_ENTRY
330 
#pragma NO_EXIT
331 
#pragma NO_FRAME
332 
 
333 
void NEAR _LOAD_FAR_8(void) {
334 
#if USE_SEVERAL_PAGES
335 
  asm {
336 
          PSHX                ; save X register
337 
          __PIC_JSR(_GET_PAGE_REG)
338 
          BEQ    L_NOPAGE
339 
          PSHA                ; save A register
340 
          LDAA   0,X          ; save page register
341 
          STAB   0,X          ; set page register
342 
          LDAB   0,Y          ; actual load, overwrites page
343 
          STAA   0,X          ; restore page register
344 
          PULA                ; restore A register
345 
          PULX                ; restore X register
346 
          RTS
347 
L_NOPAGE:
348 
          LDAB   0,Y          ; actual load, overwrites page
349 
          PULX                ; restore X register
350 
          RTS
351 
  }
352 
#else /* USE_SEVERAL_PAGES */
353 
  asm {
354 
          PSHA                ; save A register
355 
          LDAA   PAGE_ADDR    ; save page register
356 
          STAB   PAGE_ADDR    ; set page register
357 
          LDAB   0,Y          ; actual load, overwrites page
358 
          STAA   PAGE_ADDR    ; restore page register
359 
          PULA                ; restore A register
360 
          RTS
361 
  }
362 
#endif /* USE_SEVERAL_PAGES */
363 
}
364 
 
365 
/*--------------------------- _LOAD_FAR_16 --------------------------------
366 
  This runtime routine is used to access paged memory via a runtime function.
367 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
368 
 
369 
  Arguments :
370 
  - offset part of an address in the Y register
371 
  - page part of an address in the B register
372 
 
373 
  Result :
374 
  - value to be read in the Y register
375 
  - all other registers remains unchanged
376 
  - all page register still contain the same value
377 
  --------------------------- _LOAD_FAR_16 ----------------------------------*/
378 
 
379 
#ifdef __cplusplus
380 
extern "C"
381 
#endif
382 
#pragma NO_ENTRY
383 
#pragma NO_EXIT
384 
#pragma NO_FRAME
385 
 
386 
void NEAR _LOAD_FAR_16(void) {
387 
#if USE_SEVERAL_PAGES
388 
  asm {
389 
          PSHX                 ; save X register
390 
          __PIC_JSR(_GET_PAGE_REG)
391 
          BEQ   L_NOPAGE
392 
          PSHA                 ; save A register
393 
          LDAA  0,X            ; save page register
394 
          STAB  0,X            ; set page register
395 
          LDY   0,Y            ; actual load, overwrites address
396 
          STAA  0,X            ; restore page register
397 
          PULA                 ; restore A register
398 
          PULX                 ; restore X register
399 
          RTS
400 
L_NOPAGE:
401 
          LDY   0,Y              ; actual load, overwrites address
402 
          PULX                 ; restore X register
403 
          RTS
404 
  }
405 
#else /* USE_SEVERAL_PAGES */
406 
  asm {
407 
          PSHA                ; save A register
408 
          LDAA   PAGE_ADDR    ; save page register
409 
          STAB   PAGE_ADDR    ; set page register
410 
          LDY    0,Y          ; actual load, overwrites address
411 
          STAA   PAGE_ADDR    ; restore page register
412 
          PULA                ; restore A register
413 
          RTS
414 
  }
415 
#endif /* USE_SEVERAL_PAGES */
416 
}
417 
/*--------------------------- _LOAD_FAR_24 --------------------------------
418 
  This runtime routine is used to access paged memory via a runtime function.
419 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
420 
 
421 
  Arguments :
422 
  - offset part of an address in the Y register
423 
  - page part of an address in the B register
424 
 
425 
  Result :
426 
  - value to be read in the Y:B registers
427 
  - all other registers remains unchanged
428 
  - all page register still contain the same value
429 
  --------------------------- _LOAD_FAR_24 ----------------------------------*/
430 
 
431 
#ifdef __cplusplus
432 
extern "C"
433 
#endif
434 
#pragma NO_ENTRY
435 
#pragma NO_EXIT
436 
#pragma NO_FRAME
437 
 
438 
void NEAR _LOAD_FAR_24(void) {
439 
#if USE_SEVERAL_PAGES
440 
  asm {
441 
          PSHX                 ; save X register
442 
          __PIC_JSR(_GET_PAGE_REG)
443 
          BEQ   L_NOPAGE
444 
          PSHA                 ; save A register
445 
          LDAA  0,X            ; save page register
446 
          STAB  0,X            ; set page register
447 
          LDAB  0,Y            ; actual load, overwrites page of address
448 
          LDY   1,Y            ; actual load, overwrites offset of address
449 
          STAA  0,X            ; restore page register
450 
          PULA                 ; restore A register
451 
          PULX                 ; restore X register
452 
          RTS
453 
L_NOPAGE:
454 
          LDAB  0,Y            ; actual load, overwrites page of address
455 
          LDY   1,Y            ; actual load, overwrites offset of address
456 
          PULX                 ; restore X register
457 
          RTS
458 
  }
459 
#else /* USE_SEVERAL_PAGES */
460 
  asm {
461 
          PSHA                 ; save A register
462 
          LDAA   PAGE_ADDR     ; save page register
463 
          STAB   PAGE_ADDR     ; set page register
464 
          LDAB   0,Y           ; actual load, overwrites page of address
465 
          LDY    1,Y           ; actual load, overwrites offset of address
466 
          STAA   PAGE_ADDR     ; restore page register
467 
          PULA                 ; restore A register
468 
          RTS
469 
  }
470 
#endif /* USE_SEVERAL_PAGES */
471 
 
472 
}
473 
 
474 
/*--------------------------- _LOAD_FAR_32 --------------------------------
475 
  This runtime routine is used to access paged memory via a runtime function.
476 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
477 
 
478 
  Arguments :
479 
  - offset part of an address in the Y register
480 
  - page part of an address in the B register
481 
 
482 
  Result :
483 
  - low 16 bit of value to be read in the D registers
484 
  - high 16 bit of value to be read in the Y registers
485 
  - all other registers remains unchanged
486 
  - all page register still contain the same value
487 
  --------------------------- _LOAD_FAR_32 ----------------------------------*/
488 
 
489 
#ifdef __cplusplus
490 
extern "C"
491 
#endif
492 
#pragma NO_ENTRY
493 
#pragma NO_EXIT
494 
#pragma NO_FRAME
495 
 
496 
void NEAR _LOAD_FAR_32(void) {
497 
#if USE_SEVERAL_PAGES
498 
  asm {
499 
          PSHX                 ; save X register
500 
          __PIC_JSR(_GET_PAGE_REG)
501 
          BEQ   L_NOPAGE
502 
          LDAA  0,X            ; save page register
503 
          PSHA                 ; put it onto the stack
504 
          STAB  0,X            ; set page register
505 
          LDD   2,Y            ; actual load, low word
506 
          LDY   0,Y            ; actual load, high word
507 
          MOVB  1,SP+,0,X      ; restore page register
508 
          PULX                 ; restore X register
509 
          RTS
510 
L_NOPAGE:
511 
          LDD   2,Y            ; actual load, low word
512 
          LDY   0,Y            ; actual load, high word
513 
          PULX                 ; restore X register
514 
          RTS
515 
  }
516 
#else /* USE_SEVERAL_PAGES */
517 
  asm {
518 
          LDAA   PAGE_ADDR     ; save page register
519 
          PSHA                 ; put it onto the stack
520 
          STAB   PAGE_ADDR     ; set page register
521 
          LDD   2,Y            ; actual load, low word
522 
          LDY   0,Y            ; actual load, high word
523 
          MOVB  1,SP+,PAGE_ADDR; restore page register
524 
          RTS
525 
  }
526 
#endif /* USE_SEVERAL_PAGES */
527 
}
528 
 
529 
/*--------------------------- _STORE_FAR_8 --------------------------------
530 
  This runtime routine is used to access paged memory via a runtime function.
531 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
532 
 
533 
  Arguments :
534 
  - offset part of an address in the Y register
535 
  - page part of an address in the B register
536 
  - value to be stored in the B register
537 
 
538 
  Result :
539 
  - value stored at the address
540 
  - all registers remains unchanged
541 
  - all page register still contain the same value
542 
  --------------------------- _STORE_FAR_8 ----------------------------------*/
543 
 
544 
#ifdef __cplusplus
545 
extern "C"
546 
#endif
547 
#pragma NO_ENTRY
548 
#pragma NO_EXIT
549 
#pragma NO_FRAME
550 
 
551 
void NEAR _STORE_FAR_8(void) {
552 
#if USE_SEVERAL_PAGES
553 
  asm {
554 
          PSHX                   ; save X register
555 
          __PIC_JSR(_GET_PAGE_REG)
556 
          BEQ   L_NOPAGE
557 
          PSHB                   ; save B register
558 
          LDAB  0,X              ; save page register
559 
          MOVB  0,SP, 0,X        ; set page register
560 
          STAA  0,Y              ; store the value passed in A
561 
          STAB  0,X              ; restore page register
562 
          PULB                   ; restore B register
563 
          PULX                   ; restore X register
564 
          RTS
565 
L_NOPAGE:
566 
          STAA 0,Y               ; store the value passed in A
567 
          PULX                   ; restore X register
568 
          RTS
569 
  }
570 
#else /* USE_SEVERAL_PAGES */
571 
  asm {
572 
          PSHB                 ; save A register
573 
          LDAB   PAGE_ADDR     ; save page register
574 
          MOVB  0,SP,PAGE_ADDR ; set page register
575 
          STAA  0,Y            ; store the value passed in A
576 
          STAB   PAGE_ADDR     ; restore page register
577 
          PULB                   ; restore B register
578 
          RTS
579 
  }
580 
#endif /* USE_SEVERAL_PAGES */
581 
}
582 
 
583 
/*--------------------------- _STORE_FAR_16 --------------------------------
584 
  This runtime routine is used to access paged memory via a runtime function.
585 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
586 
 
587 
  Arguments :
588 
  - offset part of an address in the Y register
589 
  - page part of an address in the B register
590 
  - value to be stored in the X register
591 
 
592 
  Result :
593 
  - value stored at the address
594 
  - all registers remains unchanged
595 
  - all page register still contain the same value
596 
  --------------------------- _STORE_FAR_16 ----------------------------------*/
597 
 
598 
#ifdef __cplusplus
599 
extern "C"
600 
#endif
601 
#pragma NO_ENTRY
602 
#pragma NO_EXIT
603 
#pragma NO_FRAME
604 
 
605 
void NEAR _STORE_FAR_16(void) {
606 
#if USE_SEVERAL_PAGES
607 
  asm {
608 
          PSHX                  ; save X register
609 
          __PIC_JSR(_GET_PAGE_REG)
610 
          BEQ    L_NOPAGE
611 
 
612 
          PSHA
613 
          LDAA   0,X            ; save page register
614 
          STAB   0,X            ; set page register
615 
          MOVW   1,SP, 0,Y      ; store the value passed in X
616 
          STAA   0,X            ; restore page register
617 
          PULA                  ; restore A register
618 
          PULX                  ; restore X register
619 
          RTS
620 
 
621 
L_NOPAGE:
622 
          STX 0,Y               ; store the value passed in X
623 
          PULX                  ; restore X register
624 
          RTS
625 
  }
626 
#else /* USE_SEVERAL_PAGES */
627 
  asm {
628 
          PSHA                 ; save A register
629 
          LDAA   PAGE_ADDR     ; save page register
630 
          STAB   PAGE_ADDR     ; set page register
631 
          STX    0,Y           ; store the value passed in X
632 
          STAA   PAGE_ADDR     ; restore page register
633 
          PULA                 ; restore A register
634 
          RTS
635 
  }
636 
#endif /* USE_SEVERAL_PAGES */
637 
}
638 
/*--------------------------- _STORE_FAR_24 --------------------------------
639 
  This runtime routine is used to access paged memory via a runtime function.
640 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
641 
 
642 
  Arguments :
643 
  - offset part of an address in the Y register
644 
  - page part of an address in the B register
645 
  - value to be stored in the X:A registers (X : low 16 bit, A : high 8 bit)
646 
 
647 
  Result :
648 
  - value stored at the address
649 
  - all registers remains unchanged
650 
  - all page register still contain the same value
651 
  --------------------------- _STORE_FAR_24 ----------------------------------*/
652 
 
653 
#ifdef __cplusplus
654 
extern "C"
655 
#endif
656 
#pragma NO_ENTRY
657 
#pragma NO_EXIT
658 
#pragma NO_FRAME
659 
 
660 
void NEAR _STORE_FAR_24(void) {
661 
#if USE_SEVERAL_PAGES
662 
  asm {
663 
          PSHX                  ; save X register
664 
          __PIC_JSR(_GET_PAGE_REG)
665 
          BEQ    L_NOPAGE
666 
 
667 
          PSHA
668 
          LDAA   0,X            ; save page register
669 
          STAB   0,X            ; set page register
670 
          MOVW   1,SP, 1,Y      ; store the value passed in X
671 
          MOVB   0,SP, 0,Y      ; store the value passed in A
672 
          STAA   0,X            ; restore page register
673 
          PULA                  ; restore A register
674 
          PULX                  ; restore X register
675 
          RTS
676 
 
677 
L_NOPAGE:
678 
          STX    1,Y            ; store the value passed in X
679 
          STAA   0,Y            ; store the value passed in X
680 
          PULX                  ; restore X register
681 
          RTS
682 
  }
683 
#else /* USE_SEVERAL_PAGES */
684 
  asm {
685 
          PSHA                 ; save A register
686 
          LDAA   PAGE_ADDR     ; save page register
687 
          STAB   PAGE_ADDR     ; set page register
688 
          MOVB   0,SP, 0,Y     ; store the value passed in A
689 
          STX    1,Y           ; store the value passed in X
690 
          STAA   PAGE_ADDR     ; restore page register
691 
          PULA                 ; restore A register
692 
          RTS
693 
  }
694 
#endif /* USE_SEVERAL_PAGES */
695 
}
696 
/*--------------------------- _STORE_FAR_32 --------------------------------
697 
  This runtime routine is used to access paged memory via a runtime function.
698 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
699 
 
700 
  Arguments :
701 
  - offset part of an address in the Y register
702 
  - page part of an address is on the stack at 3,SP (just below the return address)
703 
  - value to be stored in the X:D registers (D : low 16 bit, X : high 16 bit)
704 
 
705 
  Result :
706 
  - value stored at the address
707 
  - all registers remains unchanged
708 
  - the page part is removed from the stack
709 
  - all page register still contain the same value
710 
  --------------------------- _STORE_FAR_32 ----------------------------------*/
711 
 
712 
#ifdef __cplusplus
713 
extern "C"
714 
#endif
715 
#pragma NO_ENTRY
716 
#pragma NO_EXIT
717 
#pragma NO_FRAME
718 
 
719 
void NEAR _STORE_FAR_32(void) {
720 
#if USE_SEVERAL_PAGES
721 
  asm {
722 
          PSHX                  ; save X register
723 
          __PIC_JSR(_GET_PAGE_REG)
724 
          BEQ    L_NOPAGE
725 
 
726 
          PSHD
727 
          LDAA   0,X            ; save page register
728 
          MOVB   6,SP, 0,X      ; set page register
729 
          MOVW   2,SP, 0,Y      ; store the value passed in X (high word)
730 
          MOVW   0,SP, 2,Y      ; store the value passed in D (low word)
731 
          STAA   0,X            ; restore page register
732 
          PULD                  ; restore A register
733 
          BRA done
734 
 
735 
L_NOPAGE:
736 
          MOVW   0,SP, 0,Y      ; store the value passed in X (high word)
737 
          STD          2,Y      ; store the value passed in D (low word)
738 
done:
739 
          PULX                  ; restore X register
740 
          MOVW   0,SP, 1,+SP    ; move return address
741 
          RTS
742 
  }
743 
#else /* USE_SEVERAL_PAGES */
744 
  asm {
745 
          PSHD                    ; save D register
746 
          LDAA   PAGE_ADDR        ; save page register
747 
          LDAB   4,SP             ; load page part of address
748 
          STAB   PAGE_ADDR        ; set page register
749 
          STX    0,Y              ; store the value passed in X
750 
          MOVW   0,SP, 2,Y        ; store the value passed in D (low word)
751 
          STAA   PAGE_ADDR        ; restore page register
752 
          PULD                    ; restore D register
753 
          MOVW   0,SP, 1,+SP    ; move return address
754 
          RTS
755 
  }
756 
#endif /* USE_SEVERAL_PAGES */
757 
}
758 
 
759 
/*--------------------------- _FAR_COPY --------------------------------
760 
  This runtime routine is used to access paged memory via a runtime function.
761 
  It may also be used if the compiler  option -Cp is not used with the runtime argument.
762 
 
763 
  Arguments :
764 
  - offset part of the source int the X register
765 
  - page part of the source in the A register
766 
  - offset part of the dest int the Y register
767 
  - page part of the dest in the B register
768 
  - number of bytes to be copied at 2,SP. The number of bytes is always > 0
769 
 
770 
  Result :
771 
  - memory area copied
772 
  - no registers are saved, i.e. all registers may be destroied
773 
  - all page register still contain the same value
774 
 
775 
 
776 
  stack-structure at the loop-label:
777 
     0,SP : destination offset
778 
     2,SP : source page
779 
     3,SP : destination page
780 
     4,SP : source offset
781 
     6,SP : return address
782 
     8,SP : counter, > 0
783 
  --------------------------- _FAR_COPY ----------------------------------*/
784 
 
785 
#ifdef __cplusplus
786 
extern "C"
787 
#endif
788 
#pragma NO_ENTRY
789 
#pragma NO_EXIT
790 
#pragma NO_FRAME
791 
 
792 
void NEAR _FAR_COPY(void) {
793 
#if USE_SEVERAL_PAGES
794 
  asm {
795 
        DEX                   ; source addr-=1, because loop counter ends at 1
796 
        PSHX                  ; save source offset
797 
        PSHD                  ; save both pages
798 
        DEY                   ; destination addr-=1, because loop counter ends at 1
799 
        PSHY                  ; save destination offset
800 
        LDX     8,SP          ; load counter, assuming counter > 0
801 
 
802 
loop:
803 
        LDD     4,SP          ; load source offset
804 
        LEAY    D,X           ; calcutate actual source address
805 
        LDAB    2,SP          ; load source page
806 
        __PIC_JSR (_LOAD_FAR_8); load 1 source byte
807 
        PSHB                  ; save value
808 
        LDD     0+1,SP        ; load destination offset
809 
        LEAY    D,X           ; calcutate acual destination address
810 
        PULA                  ; restore value
811 
        LDAB    3,SP          ; load destination page
812 
        __PIC_JSR (_STORE_FAR_8); store one byte
813 
        DEX
814 
        BNE     loop
815 
        LDX     6,SP          ; load return address
816 
        LEAS    10,SP         ; release stack
817 
        JMP     0,X           ; return
818 
  }
819 
#else
820 
  asm {
821 
        PSHD                   ; store page registers
822 
        TFR   X,D
823 
        ADDD  4,SP             ; calculate source end address
824 
        STD   4,SP
825 
        PULB                   ; reload source page
826 
        LDAA  PAGE_ADDR        ; save page register
827 
        PSHA
828 
loop:
829 
        STAB  PAGE_ADDR        ; set source page
830 
        LDAA  1,X+             ; load value
831 
        MOVB  1,SP, PAGE_ADDR  ; set destination page
832 
        STAA  1,Y+
833 
        CPX   4,SP
834 
        BNE   loop
835 
 
836 
        LDAA  2,SP+            ; restore old page value and release stack
837 
        STAA  PAGE_ADDR        ; store it into page register
838 
        LDX   4,SP+            ; release stack and load return address
839 
        JMP   0,X              ; return
840 
  }
841 
#endif
842 
}
843 
 

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