;* ======================================================================== *; ;* This file is hereby placed into the public domain by its author, *; ;* Joseph Zbiciak. It may therefore be incorporated into programs *; ;* with any license with no restrictions on the resulting program. *; ;* ======================================================================== *; ;; ======================================================================== ;; ;; INITMEM ;; ;; ;; ;; These are the macros that work with the INITMEM function. ;; ;; ;; ;; Initialize a set of variables to initial values. Initialization ;; ;; records are 1 word each typically. All variables are in the range ;; ;; $0F0 - $35F. So, each record is formatted as follows. ;; ;; ;; ;; 15 10 9 0 ;; ;; +---------------------+-----------------------------------+ ;; ;; | Value | Address | ;; ;; +---------------------+-----------------------------------+ ;; ;; ;; ;; A record of 0 terminates the initializer list. ;; ;; ;; ;; The "value" field is actually encoded. $20 - $3F directly map to ;; ;; the constants $00 - $1F. $00 - $1E map to constants in a separate ;; ;; constants table. $1F indicates the constant appears in the following ;; ;; word. Furthermore, constant table entries $00 - $0F are packed 8-bit ;; ;; contants, whereas $10 - $1E are unpacked 16-bit constants. ;; ;; ;; ;; INITMEM macros: ;; ;; ;; ;; INIT addr, val Set 'addr' to 'value' as part of init list. ;; ;; INIT_DONE Terminates an init list ;; ;; EMIT_CST8 Outputs the accumulated CST8 table. ;; ;; EMIT_CST16 Outputs the accumulated CST16 table. ;; ;; ;; ;; ======================================================================== ;; _init_const SET 0 _init_escape SET 0 ;; ======================================================================== ;; ;; Helper macros: (Programs should not call these.) ;; ;; ;; ;; _init_try See if constant is already allocated in CST tables. ;; ;; _init_alloc8 Allocate an 8-bit constant. ;; ;; _init_alloc16 Allocate a 16-bit constant. ;; ;; _init_encode_constant Given a cst, return bits 15:10 of init rec. ;; ;; _emit_cst8 Output two entries of CST8 table if defined. ;; ;; _emit_cst16 Output an entry of CST16 table if defined. ;; ;; ;; ;; ======================================================================== ;; MACRO _init_try(v,c) IF (%v% = _init_cst_%c%) _init_const SET ($%c%) SHL 10 ENDI ENDM MACRO _init_alloc8(v,c) IF (_init_const = -1) AND (DEFINED _init_cst_%c%) = 0 _init_cst_%c% EQU (%v%) _init_const SET ($%c%) SHL 10 ENDI ENDM MACRO _init_alloc16(v,c) IF (_init_const = -1) AND (DEFINED _init_cst_%c%) = 0 _init_cst_%c% EQU (%v%) _init_const SET ($%c%) SHL 10 ENDI ENDM MACRO _init_encode_constant(v) _init_escape SET 0 _init_const SET -1 IF (%v% >= $00) AND (%v% <= $1F) _init_const SET (%v% + $20) SHL 10 ELSE _init_try(%v%,00) _init_try(%v%,01) _init_try(%v%,02) _init_try(%v%,03) _init_try(%v%,04) _init_try(%v%,05) _init_try(%v%,06) _init_try(%v%,07) _init_try(%v%,08) _init_try(%v%,09) _init_try(%v%,0A) _init_try(%v%,0B) _init_try(%v%,0C) _init_try(%v%,0D) _init_try(%v%,0E) _init_try(%v%,0F) _init_try(%v%,10) _init_try(%v%,11) _init_try(%v%,12) _init_try(%v%,13) _init_try(%v%,14) _init_try(%v%,15) _init_try(%v%,16) _init_try(%v%,17) _init_try(%v%,18) _init_try(%v%,19) _init_try(%v%,1A) _init_try(%v%,1B) _init_try(%v%,1C) _init_try(%v%,1D) _init_try(%v%,1E) ENDI IF ((%v% - $20) AND $FF00) = 0 _init_alloc8(%v%,00) _init_alloc8(%v%,01) _init_alloc8(%v%,02) _init_alloc8(%v%,03) _init_alloc8(%v%,04) _init_alloc8(%v%,05) _init_alloc8(%v%,06) _init_alloc8(%v%,07) _init_alloc8(%v%,08) _init_alloc8(%v%,09) _init_alloc8(%v%,0A) _init_alloc8(%v%,0B) _init_alloc8(%v%,0C) _init_alloc8(%v%,0D) _init_alloc8(%v%,0E) _init_alloc8(%v%,0F) ELSE _init_alloc16(%v%,10) _init_alloc16(%v%,11) _init_alloc16(%v%,12) _init_alloc16(%v%,13) _init_alloc16(%v%,14) _init_alloc16(%v%,15) _init_alloc16(%v%,16) _init_alloc16(%v%,17) _init_alloc16(%v%,18) _init_alloc16(%v%,19) _init_alloc16(%v%,1A) _init_alloc16(%v%,1B) _init_alloc16(%v%,1C) _init_alloc16(%v%,1D) _init_alloc16(%v%,1E) ENDI IF _init_const = -1 _init_const EQU $1F SHL 10 _init_escape EQU 1 ENDI ENDM MACRO _emit_cst8(a,b) IF (DEFINED _init_cst_%a%) <> 0 _init_tmp SET (((_init_cst_%a% - $20) AND $FF) SHL 8) ENDI IF (DEFINED _init_cst_%b%) <> 0 _init_tmp SET _init_tmp OR ((_init_cst_%b% - $20) AND $FF) ENDI IF (DEFINED _init_cst_%a%) OR (DEFINED _init_cst_%b%) DECLE _init_tmp ENDI ENDM MACRO _emit_cst16(a) IF (DEFINED _init_cst_%a%) <> 0 DECLE _init_cst_%a% ENDI ENDM ;; ======================================================================== ;; ;; INIT addr, val -- Output an initialization record ;; ;; ======================================================================== ;; MACRO INIT a, v LISTING "code" _init_encode_constant(%v%) IF _init_escape = 0 DECLE _init_const OR %a% ELSE DECLE _init_const OR %a%, %v% ENDI LISTING "prev" ENDM ;; ======================================================================== ;; ;; INIT_DONE Terminate an initialization list. ;; ;; ======================================================================== ;; MACRO INIT_DONE DECLE 0 ENDM ;; ======================================================================== ;; ;; EMIT_CST8 Output the CST8 table. This call must appear after all ;; ;; INIT lists due to assembler restrictions. ;; ;; ======================================================================== ;; MACRO EMIT_CST8 CST8 PROC LISTING "code" IF (DEFINED _cst8_fix) AND ((CST8 AND $8000) = 0) _init_tmp SET $ ORG _cst8_fix CLRC ; patch up INITMEM ORG _init_tmp ENDI _emit_cst8(00, 01) _emit_cst8(02, 03) _emit_cst8(04, 05) _emit_cst8(06, 07) _emit_cst8(08, 09) _emit_cst8(0A, 0B) _emit_cst8(0C, 0D) _emit_cst8(0E, 0F) LISTING "prev" ENDP ENDM ;; ======================================================================== ;; ;; EMIT_CST16 Output the CST16 table. This call must appear after all ;; ;; INIT lists due to assembler restrictions. ;; ;; ======================================================================== ;; MACRO EMIT_CST16 CST16 PROC LISTING "code" _emit_cst16(10) _emit_cst16(11) _emit_cst16(12) _emit_cst16(13) _emit_cst16(14) _emit_cst16(15) _emit_cst16(16) _emit_cst16(17) _emit_cst16(18) _emit_cst16(19) _emit_cst16(1A) _emit_cst16(1B) _emit_cst16(1C) _emit_cst16(1D) _emit_cst16(1E) LISTING "prev" ENDP ENDM