- page 255
- .z80
-
-
- global mmuinit
- global bnk2log,bnk2phy,hwl2phy,phy2log
-
- include config.inc
- include z180reg.inc
-
-
-;----------------------------------------------------------------------
-; Memory Map 1:
-;
-; Common CAStart .. 0FFFF
-; Bank 0 00000 .. CAStart-1
-; Bank 1 10000 ..
-; Bank 2
-;
-; Memory Map 2:
-;
-; Common 18000 .. 1BFFF BANK1
-;
-; Bank 0 00000 .. 0BFFF 0
-; Bank 1 0C000 .. 17FFF 1*BNK_SIZE
-; Bank 2 1C000 .. 27FFF 2*BNK_SIZE + CMN_SIZE
-; Bank 3 28000 .. 33FFF 3*BNK_SIZE + CMN_SIZE
-; Bank n n*BNK_SIZE + (n < 2) ? 0 : CMN_SIZE
-;
-;----------------------------------------------------------------------
-
- cseg
-
-mmuinit:
- ld a,USR$CBAR
- out0 (cbar),a
- ret
-
-;--------------------------------------------------------------------
-; Return the BBR value for the given bank number
-;
-; in a: Bank number
-; out a: bbr value
-
- if 0 ; Memory Map 1
-
-bnk2log:
- or a ;
- ret z ; Bank 0 is at physical address 0
-
- dec a ;
- push bc ;
- ld c,a ;
- ld b,BNK_SIZE ;
- mlt bc ; bank size * bank number
- ld a,c ;
- add a,10h ; add bank0 + common
- pop bc ;
- ret ;
-
- else ; Memory Map 2
-
-bnk2log:
- or a
- ret z ; Bank 0 is at physical address 0
-
- push bc
- ld c,a ;
- ld b,BNK_SIZE ;
- mlt bc ; bank size * bank number
- cp 2 ;
- ld a,c ;
- pop bc
- ret c
- add a,CMN_SIZE
- ret
-
- endif
-
- if 0 ; table version
-
- push hl
- ld hl,bnk_table ;
- add a,l ;
- ld l,a ;
- jr nc,$+3 ;
- inc h ;
- ld a,(hl) ;
- pop hl
- ret
-
- endif
-
-;--------------------------------------------------------------
-
-;in hl: Log. Address
-; a: Bank number
-;
-;out ahl: Phys. (linear) Address
-
-
-bnk2phy:
- push bc
- ld c,a
- ld a,h
- and a,0f0h
- cp CA*16
- ld a,c
- pop bc
- jr c,b2p_banked
- ; address is in common
- if 0 ; Memory Map 1
- ld a,0 ; base is 0
- else ; Memory Map 2
- ld a,1 ; same as bank1
- endif
-
-b2p_banked:
- call bnk2log ; get address base
-
- ; fall thru
-
-;--------------------------------------------------------------
-;
-; hl: Log. Address
-; a: Bank base (bbr)
-;
-; 2 0 0
-; 0 6 8 0
-; hl hhhhhhhhllllllll
-; a + bbbbbbbb
-;
-; OP: ahl = (a<<12) + (h<<8) + l
-;
-;out ahl: Phys. (linear) Address
-
-log2phy:
- push bc ;
-l2p_i:
- ld c,a ;
- ld b,16 ;
- mlt bc ; bc = a<<4
- ld a,c ;
- add a,h ;
- ld h,a ;
- ld a,b ;
- adc a,0 ;
- pop bc ;
- ret ;
-
-;--------------------------------------------------------------
-;
-; hl: Log. Address
-;
-;
-; OP: ahl = (bankbase<<12) + (h<<8) + l
-;
-;out ahl: Phys. (linear) Address
-
-
-hwl2phy:
- push bc ;
- in0 c,(cbar) ;
- ld a,h ;
- or 00fh ; log. addr in common1?
- cp c
- jr c,hlp_1
-
- in0 a,(cbr) ; yes, cbr is address base
- jr hl2p_x
-hlp_1:
- ld b,16 ; log. address in baked area?
- mlt bc
- ld a,h
- cp c
- jr c,hlp_2
- in0 a,(bbr) ; yes, bbr is address base
- jr hl2p_x
-hlp_2:
- xor a ; common1
-hl2p_x:
- jr nz,l2p_i
-
- pop bc ; bank part is 0, no translation
- ret ;
-
-
-;--------------------------------------------------------------
-; return logical bank 0 address for given physical address.
-;
-; in: ahl: pyhsical addres (20 bit)
-; out hl: logical address.
-; logical address is in bank 0 or common, no bank number returned
-;
-
-phy2log:
- or a
- ret z
-
- push bc
- push hl
- ld l,h
- ld h,0
- ld bc,-16*SYS$CBR
- add hl,bc
- ld h,l
- pop bc
- ld l,c
- pop bc
- ret
-
-;--------------------------------------------------------------
-; Trampoline for routines in banked ram.
-; Switch stack pointer to "system" stack in top ram
-; Save cbar
-;
- extrn bs$stack
-
- cseg ; common!
-
- public _b0call
-_b0call:
- push af
- in0 a,(bbr)
- jr nz,b0c_doit
- pop af
-
- ex (sp),hl ;16
- push de
- ld e,(hl)
- inc hl
- ld d,(hl)
- inc hl
- ld (b0c_fast_go),de
- pop de
- ex (sp),hl ;16
-b0c_fast_go equ $+1
- jp 0
-
-b0c_doit:
- ld (b0_save_hl),hl
- ld (b0_save_de),de
- pop hl
- ld (b0_save_af),hl
-
- pop de ;get ptr to 'function address' in de
- ld hl,2
- add hl,de
- push hl ;put return address on stack
-
- if 0 ; link80
-
- ld hl,0
- add hl,sp ;
- ld a,h
- cp high (bs$stack-bs$stack$size) ;link80 can't process this
- jr nc,$ + 5 ;skip if stack allready in common bios ram
-
- else
-
- ld hl,bs$stack-bs$stack$size
- ld a,h
- dec a
- ld hl,0
- add hl,sp ;
- cp h
- jr c,$ + 5 ;skip if stack allready in common bios ram
- endif
- ld sp,bs$stack ;
-
- push hl ;save user stack pointer
-
- in0 h,(bbr) ;
- push hl ;
- ld hl,b0c_ret
- push hl
- xor a
- out0 (bbr),a ;
- ex de,hl ;ptr
- ld e,(hl) ;get 'function address'
- inc hl ;
- ld d,(hl) ;
- push de ;put on (switched) stack
-
- ld hl,(b0_save_af) ;get back users registers
- push hl
- pop af
- ld de,(b0_save_de)
- ld hl,(b0_save_hl)
- ret ;go to function
-b0c_ret:
- ld (b0_save_hl),hl
-
- pop hl ;
- out0 (bbr),h ;
- pop hl ;
- ld sp,hl ;
- ld hl,(b0_save_hl)
- ret ;
-
-
-b0_save_hl: dw 0
-b0_save_de: dw 0
-b0_save_af: dw 0
-
-
-
-;====================================================================
-
- if 0
-
-;--------------------------------------------------------------------
-; Return the BBR value for the given bank number
-
-bnk2bbr:
- or a ; 4
- ret z ; 5/10 | 11 14
-
- push bc ;11 | 11
- ld b,a ; 4
- ld c,CA ; 6
- mlt bc ;17 >45
- ld a,c ; 4
- add a,10h ; 6
- pop bc ; 9 | 10
- ret ; 9 | 10 76
-
- push ix ;2 / 14 | 15
- ld ix,bnktbl ;4 / 12 | 14
- ld ($+3+2),a ;3 / 15 | 19
- ld a,(ix+0) ;3 / 14 | 19
- pop ix ;2 / 12 | 14
- ret ;1 / 9 | 10 15 / 76|91
-
- push hl ;1 / 11 | 11
- ld hl,bnktbl ;3 / 9 | 10
- add a,l ;1 / 4 | 4
- ld l,a ;1 / 4 | 4
- ld a,0 ;1 / 6 | 7
- adc a,h ;1 / 4 | 4
- ld h,a ;1 / 4 | 4
- ld a,(hl) ;1 / 6 | 7
- pop hl ;1 / 9 | 10
- ret ;1 / 9 | 10 12 / 66|71
-
- push hl ;1 / 11 | 11
- add a,low bnktbl ;2 / 6 | 7
- ld l,a ;1 / 4 | 4
- ld a,0 ;1 / 6 | 7
- adc a,high bnktbl ;2 / 6 | 7
- ld h,a ;1 / 4 | 4
- ld a,(hl) ;1 / 6 | 7
- pop hl ;1 / 9 | 10
- ret ;1 / 9 | 10 11 / 61|67
-
- endif
-
-
- end
+ page 255\r
+ .z80\r
+\r
+\r
+ global mmuinit\r
+ global bnk2log,bnk2phy,hwl2phy,phy2log\r
+\r
+ include config.inc\r
+ include z180reg.inc\r
+\r
+\r
+;----------------------------------------------------------------------\r
+; Memory Map 1:\r
+;\r
+; Common CAStart .. 0FFFF\r
+; Bank 0 00000 .. CAStart-1\r
+; Bank 1 10000 ..\r
+; Bank 2\r
+;\r
+; Memory Map 2:\r
+;\r
+; Common 18000 .. 1BFFF BANK1\r
+;\r
+; Bank 0 00000 .. 0BFFF 0\r
+; Bank 1 0C000 .. 17FFF 1*BNK_SIZE\r
+; Bank 2 1C000 .. 27FFF 2*BNK_SIZE + CMN_SIZE\r
+; Bank 3 28000 .. 33FFF 3*BNK_SIZE + CMN_SIZE\r
+; Bank n n*BNK_SIZE + (n < 2) ? 0 : CMN_SIZE\r
+;\r
+;----------------------------------------------------------------------\r
+\r
+ cseg\r
+\r
+mmuinit:\r
+ ld a,USR$CBAR\r
+ out0 (cbar),a\r
+ ret\r
+\r
+;--------------------------------------------------------------------\r
+; Return the BBR value for the given bank number\r
+;\r
+; in a: Bank number\r
+; out a: bbr value\r
+\r
+ if 0 ; Memory Map 1\r
+\r
+bnk2log:\r
+ or a ;\r
+ ret z ; Bank 0 is at physical address 0\r
+\r
+ dec a ;\r
+ push bc ;\r
+ ld c,a ;\r
+ ld b,BNK_SIZE ;\r
+ mlt bc ; bank size * bank number\r
+ ld a,c ;\r
+ add a,10h ; add bank0 + common\r
+ pop bc ;\r
+ ret ;\r
+\r
+ else ; Memory Map 2\r
+\r
+bnk2log:\r
+ or a\r
+ ret z ; Bank 0 is at physical address 0\r
+\r
+ push bc\r
+ ld c,a ;\r
+ ld b,BNK_SIZE ;\r
+ mlt bc ; bank size * bank number\r
+ cp 2 ;\r
+ ld a,c ;\r
+ pop bc\r
+ ret c\r
+ add a,CMN_SIZE\r
+ ret\r
+\r
+ endif\r
+\r
+ if 0 ; table version\r
+\r
+ push hl\r
+ ld hl,bnk_table ;\r
+ add a,l ;\r
+ ld l,a ;\r
+ jr nc,$+3 ;\r
+ inc h ;\r
+ ld a,(hl) ;\r
+ pop hl\r
+ ret\r
+\r
+ endif\r
+\r
+;--------------------------------------------------------------\r
+\r
+;in hl: Log. Address\r
+; a: Bank number\r
+;\r
+;out ahl: Phys. (linear) Address\r
+\r
+\r
+bnk2phy:\r
+ push bc\r
+ ld c,a\r
+ ld a,h\r
+ and a,0f0h\r
+ cp CA*16\r
+ ld a,c\r
+ pop bc\r
+ jr c,b2p_banked\r
+ ; address is in common\r
+ if 0 ; Memory Map 1\r
+ ld a,0 ; base is 0\r
+ else ; Memory Map 2\r
+ ld a,1 ; same as bank1\r
+ endif\r
+\r
+b2p_banked:\r
+ call bnk2log ; get address base\r
+\r
+ ; fall thru\r
+\r
+;--------------------------------------------------------------\r
+;\r
+; hl: Log. Address\r
+; a: Bank base (bbr)\r
+;\r
+; 2 0 0\r
+; 0 6 8 0\r
+; hl hhhhhhhhllllllll\r
+; a + bbbbbbbb\r
+;\r
+; OP: ahl = (a<<12) + (h<<8) + l\r
+;\r
+;out ahl: Phys. (linear) Address\r
+\r
+log2phy:\r
+ push bc ;\r
+l2p_i:\r
+ ld c,a ;\r
+ ld b,16 ;\r
+ mlt bc ; bc = a<<4\r
+ ld a,c ;\r
+ add a,h ;\r
+ ld h,a ;\r
+ ld a,b ;\r
+ adc a,0 ;\r
+ pop bc ;\r
+ ret ;\r
+\r
+;--------------------------------------------------------------\r
+;\r
+; hl: Log. Address\r
+;\r
+;\r
+; OP: ahl = (bankbase<<12) + (h<<8) + l\r
+;\r
+;out ahl: Phys. (linear) Address\r
+\r
+\r
+hwl2phy:\r
+ push bc ;\r
+ in0 c,(cbar) ;\r
+ ld a,h ;\r
+ or 00fh ; log. addr in common1?\r
+ cp c\r
+ jr c,hlp_1\r
+\r
+ in0 a,(cbr) ; yes, cbr is address base\r
+ jr hl2p_x\r
+hlp_1:\r
+ ld b,16 ; log. address in baked area?\r
+ mlt bc\r
+ ld a,h\r
+ cp c\r
+ jr c,hlp_2\r
+ in0 a,(bbr) ; yes, bbr is address base\r
+ jr hl2p_x\r
+hlp_2:\r
+ xor a ; common1\r
+hl2p_x:\r
+ jr nz,l2p_i\r
+\r
+ pop bc ; bank part is 0, no translation\r
+ ret ;\r
+\r
+\r
+;--------------------------------------------------------------\r
+; return logical bank 0 address for given physical address.\r
+;\r
+; in: ahl: pyhsical addres (20 bit)\r
+; out hl: logical address.\r
+; logical address is in bank 0 or common, no bank number returned\r
+;\r
+\r
+phy2log:\r
+ or a\r
+ ret z\r
+\r
+ push bc\r
+ push hl\r
+ ld l,h\r
+ ld h,0\r
+ ld bc,-16*SYS$CBR\r
+ add hl,bc\r
+ ld h,l\r
+ pop bc\r
+ ld l,c\r
+ pop bc\r
+ ret\r
+\r
+;--------------------------------------------------------------\r
+; Trampoline for routines in banked ram.\r
+; Switch stack pointer to "system" stack in top ram\r
+; Save cbar\r
+;\r
+ extrn bs$stack\r
+\r
+ cseg ; common!\r
+\r
+ public _b0call\r
+_b0call:\r
+ push af\r
+ in0 a,(bbr)\r
+ jr nz,b0c_doit\r
+ pop af\r
+\r
+ ex (sp),hl ;16\r
+ push de\r
+ ld e,(hl)\r
+ inc hl\r
+ ld d,(hl)\r
+ inc hl\r
+ ld (b0c_fast_go),de\r
+ pop de\r
+ ex (sp),hl ;16\r
+b0c_fast_go equ $+1\r
+ jp 0\r
+\r
+b0c_doit:\r
+ ld (b0_save_hl),hl\r
+ ld (b0_save_de),de\r
+ pop hl\r
+ ld (b0_save_af),hl\r
+\r
+ pop de ;get ptr to 'function address' in de\r
+ ld hl,2\r
+ add hl,de\r
+ push hl ;put return address on stack\r
+\r
+ if 0 ; link80\r
+\r
+ ld hl,0\r
+ add hl,sp ;\r
+ ld a,h\r
+ cp high (bs$stack-bs$stack$size) ;link80 can't process this\r
+ jr nc,$ + 5 ;skip if stack allready in common bios ram\r
+\r
+ else\r
+\r
+ ld hl,bs$stack-bs$stack$size\r
+ ld a,h\r
+ dec a\r
+ ld hl,0\r
+ add hl,sp ;\r
+ cp h\r
+ jr c,$ + 5 ;skip if stack allready in common bios ram\r
+ endif\r
+ ld sp,bs$stack ;\r
+\r
+ push hl ;save user stack pointer\r
+\r
+ in0 h,(bbr) ;\r
+ push hl ;\r
+ ld hl,b0c_ret\r
+ push hl\r
+ xor a\r
+ out0 (bbr),a ;\r
+ ex de,hl ;ptr\r
+ ld e,(hl) ;get 'function address'\r
+ inc hl ;\r
+ ld d,(hl) ;\r
+ push de ;put on (switched) stack\r
+\r
+ ld hl,(b0_save_af) ;get back users registers\r
+ push hl\r
+ pop af\r
+ ld de,(b0_save_de)\r
+ ld hl,(b0_save_hl)\r
+ ret ;go to function\r
+b0c_ret:\r
+ ld (b0_save_hl),hl\r
+\r
+ pop hl ;\r
+ out0 (bbr),h ;\r
+ pop hl ;\r
+ ld sp,hl ;\r
+ ld hl,(b0_save_hl)\r
+ ret ;\r
+\r
+\r
+b0_save_hl: dw 0\r
+b0_save_de: dw 0\r
+b0_save_af: dw 0\r
+\r
+\r
+\r
+;====================================================================\r
+\r
+ if 0\r
+\r
+;--------------------------------------------------------------------\r
+; Return the BBR value for the given bank number\r
+\r
+bnk2bbr:\r
+ or a ; 4\r
+ ret z ; 5/10 | 11 14\r
+\r
+ push bc ;11 | 11\r
+ ld b,a ; 4\r
+ ld c,CA ; 6\r
+ mlt bc ;17 >45\r
+ ld a,c ; 4\r
+ add a,10h ; 6\r
+ pop bc ; 9 | 10\r
+ ret ; 9 | 10 76\r
+\r
+ push ix ;2 / 14 | 15\r
+ ld ix,bnktbl ;4 / 12 | 14\r
+ ld ($+3+2),a ;3 / 15 | 19\r
+ ld a,(ix+0) ;3 / 14 | 19\r
+ pop ix ;2 / 12 | 14\r
+ ret ;1 / 9 | 10 15 / 76|91\r
+\r
+ push hl ;1 / 11 | 11\r
+ ld hl,bnktbl ;3 / 9 | 10\r
+ add a,l ;1 / 4 | 4\r
+ ld l,a ;1 / 4 | 4\r
+ ld a,0 ;1 / 6 | 7\r
+ adc a,h ;1 / 4 | 4\r
+ ld h,a ;1 / 4 | 4\r
+ ld a,(hl) ;1 / 6 | 7\r
+ pop hl ;1 / 9 | 10\r
+ ret ;1 / 9 | 10 12 / 66|71\r
+\r
+ push hl ;1 / 11 | 11\r
+ add a,low bnktbl ;2 / 6 | 7\r
+ ld l,a ;1 / 4 | 4\r
+ ld a,0 ;1 / 6 | 7\r
+ adc a,high bnktbl ;2 / 6 | 7\r
+ ld h,a ;1 / 4 | 4\r
+ ld a,(hl) ;1 / 6 | 7\r
+ pop hl ;1 / 9 | 10\r
+ ret ;1 / 9 | 10 11 / 61|67\r
+\r
+ endif\r
+\r
+\r
+ end\r
projects / z180-stamp-cpm3.git / blobdiff