np2/i286a/memoryd.s - view

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I286_MEMREADMAX equ &a4000 I286_MEMWRITEMAX equ &a0000 USE_HIMEM equ &110000 ; cpu_reg equ 0 ; cpu_remainclock equ 28 ; cpu_baseclock equ 32 ; cpu_clock equ 36 ; cpu_adrsmask equ 40 ; cpu_es_base equ 44 ; cpu_cs_base equ 48 ; cpu_ss_base equ 52 ; cpu_ds_base equ 56 ; cpu_ss_fix equ 60 ; cpu_ds_fix equ 64 ; cpu_prefix equ 68 ; cpu_trap equ 70 ; cpu_type equ 71 ; cpu_pf_semaphore equ 72 ; cpu_repbak equ 76 ; cpu_inport equ 80 ; cpu_ovflag equ 84 ; cpu_GDTR equ 88 ; cpu_IDTR equ 94 ; cpu_MSW equ 100 ; cpu_resetreq equ 102 ; cpu_itfbank equ 103 CPU_EXTMEM equ 104 CPU_EXTMEMSIZE equ 108 CPU_MAINMEM equ 112 ; IMPORT mem IMPORT memfn IMPORT i286core IMPORT i286_nonram_r IMPORT i286_nonram_rw EXPORT i286_memoryread EXPORT i286_memoryread_w EXPORT i286_memorywrite EXPORT i286_memorywrite_w MACRO $label MEMADR $offset $label dcd (i286core + CPU_MAINMEM) $offset MEND AREA .text, CODE, READONLY i286_memoryread cmp r0, #I286_MEMREADMAX bcs i2mr_ext ldr r1, i2mr_mem ldrb r0, [r0, r1] mov pc, lr i2mr_mem MEMADR ; !! i2mr_ext cmp r0, #USE_HIMEM bcs i2mr_himem ldr r3, i2mr_memfnrd8 and r1, r0, #(&1f << 15) ldr pc, [r3, r1, lsr #(15 - 2)] i2mr_memfnrd8 dcd memfn i2mr_himem sub r1, r0, #&100000 ldr r3, i2mr_cpu ldr r12, [r3, #CPU_EXTMEMSIZE] cmp r1, r12 bcs i286_nonram_r ldr r12, [r3, #CPU_EXTMEM] ldrb r0, [r1, r12] mov pc, lr i2mr_cpu dcd i286core ; !! i286_memoryread_w tst r0, #1 bne i2mro_main cmp r0, #I286_MEMREADMAX bcs i2mre_ext ldr r1, i2mrw_mem ldrh r0, [r0, r1] mov pc, lr i2mrw_mem MEMADR i2mre_ext cmp r0, #USE_HIMEM bcs i2mre_himem i2mrw_ext ldr r3, i2mre_memfnrd16 and r1, r0, #(&1f << 15) ldr pc, [r3, r1, lsr #(15 - 2)] i2mre_memfnrd16 dcd memfn + (32 * 4) * 2 i2mre_himem sub r1, r0, #&100000 ldr r3, i2mre_cpu ldr r12, [r3, #CPU_EXTMEMSIZE] cmp r1, r12 bcs i286_nonram_rw ldr r12, [r3, #CPU_EXTMEM] ldrh r0, [r1, r12] mov pc, lr i2mre_cpu dcd i286core ; !! i2mro_main add r1, r0, #1 cmp r1, #I286_MEMREADMAX bcs i2mro_ext ldr r1, i2mrw_mem add r1, r1, r0 ldrb r0, [r1] ldrb r1, [r1, #1] add r0, r0, r1 lsl #8 mov pc, lr i2mro_ext cmp r1, #USE_HIMEM bcs i2mro_himem movs r1, r1, lsl #(32 - 15) bne i2mrw_ext stmdb sp!, {r4 - r6, lr} ; ここチェックするように… ldr r4, i2mro_memfnrd8 add r5, r0, #1 and r1, r0, #(&1f << 15) mov lr, pc ldr pc, [r4, r1, lsr #(15 - 2)] mov r6, r0 mov r0, r5 and r1, r0, #(&1f << 15) mov lr, pc ldr pc, [r4, r1, lsr #(15 - 2)] add r0, r6, r0 lsl #8 ldmia sp!, {r4 - r6, pc} i2mro_memfnrd8 dcd memfn i2mro_himem sub r1, r1, #&100000 ldr r3, i2mro_cpu ldr r2, [r3, #CPU_EXTMEM] ldr r12, [r3, #CPU_EXTMEMSIZE] add r2, r2, r1 beq i2mro_10ffff ; = 10ffff cmp r1, r12 bcs i2mro_himeml ; = over ldrb r0, [r2, #-1] ldrb r1, [r2] add r0, r0, r1 lsl #8 mov pc, lr i2mro_10ffff ldr r0, i2mro_mem10ffff ldrb r0, [r0] cmp r1, r12 bcs i2mro_himemh ldrb r1, [r2] add r0, r0, r1 lsl #8 mov pc, lr i2mro_himeml ldreqb r0, [r2, #-1] movne r0, #&ff i2mro_himemh add r0, r0, #&ff00 mov pc, lr i2mro_cpu dcd i286core ; !! i2mro_mem10ffff MEMADR + USE_HIMEM - 1 i286_memorywrite cmp r0, #I286_MEMWRITEMAX bcs i2mw_ext ldr r2, i2mw_mem strb r1, [r0, r2] mov pc, lr i2mw_mem MEMADR ; !! i2mw_ext cmp r0, #USE_HIMEM bcs i2mw_himem ldr r3, i2mw_memfnwr8 and r2, r0, #(&1f << 15) ldr pc, [r3, r2, lsr #(15 - 2)] i2mw_memfnwr8 dcd memfn + (32 * 4) i2mw_himem sub r2, r0, #&100000 ldr r3, i2mw_cpu ldr r12, [r3, #CPU_EXTMEMSIZE] ldr r3, [r3, #CPU_EXTMEM] cmp r2, r12 strccb r1, [r2, r3] mov pc, lr i2mw_cpu dcd i286core ; !! if 1 i286_memorywrite_w tst r0, #1 bne i2mwo_main cmp r0, #I286_MEMWRITEMAX bcs i2mwe_ext ldr r2, i2mww_mem strh r1, [r0, r2] mov pc, lr i2mww_mem MEMADR ; !! i2mwe_ext cmp r0, #USE_HIMEM bcs i2mwe_himem i2mww_ext ldr r3, i2mwe_memfnwr16 and r2, r0, #(&1f << 15) ldr pc, [r3, r2, lsr #(15 - 2)] i2mwe_memfnwr16 dcd memfn + (32 * 4) * 3 i2mwe_himem sub r2, r0, #&100000 ldr r3, i2mwe_cpu ldr r12, [r3, #CPU_EXTMEMSIZE] ldr r3, [r3, #CPU_EXTMEM] cmp r2, r12 strcch r1, [r2, r3] mov pc, lr i2mwe_cpu dcd i286core ; !! i2mwo_main add r2, r0, #1 cmp r2, #I286_MEMWRITEMAX bcs i2mwo_ext ldr r2, i2mww_mem add r2, r2, r0 strb r1, [r2] mov r1, r1, lsr #8 strb r1, [r2, #1] mov pc, lr i2mwo_ext cmp r2, #USE_HIMEM bcs i2mwo_himem movs r2, r2, lsl #(32 - 15) bne i2mww_ext ldr r2, i2mwo_memfnwr8 stmdb sp!, {r0 - r1, lr} ; ここチェックするように… and r3, r0, #(&1f << 15) mov lr, pc ldr pc, [r2, r3, lsr #(15 - 2)] ldmia sp!, {r0 - r1, lr} ldr r2, i2mwo_memfnwr8 add r0, r0, #1 mov r1, r1, lsr #8 and r3, r0, #(&1f << 15) ldr pc, [r2, r3, lsr #(15 - 2)] i2mwo_memfnwr8 dcd memfn + (32 * 4) i2mwo_himem sub r2, r2, #&100000 ldr r3, i2mwo_cpu ldr r12, [r3, #CPU_EXTMEM] ldr r3, [r3, #CPU_EXTMEMSIZE] add r12, r12, r2 beq i2mwo_10ffff ; = 10ffff cmp r2, r3 strlsb r1, [r12, #-1] mov r1, r1, lsr #8 strccb r1, [r12] mov pc, lr i2mwo_10ffff ldr r2, i2mwo_mem10ffff strb r1, [r12] cmp r3, #0 mov r1, r1, lsr #8 strneb r1, [r12] mov pc, lr i2mwo_cpu dcd i286core ; !! i2mwo_mem10ffff MEMADR + USE_HIMEM - 1 endif END