Mark SDIO-drives as permanently mounted.

[z180-stamp-cpm3.git] / cbios / mm.180

diff --git a/cbios/mm.180 b/cbios/mm.180
index 9d1e2561f7e48290f43084c39b898fc5570cee7c..d9efd168f8f10fe380a9cdc963d4bea62fcc3aae 100644 (file)
--- a/cbios/mm.180
+++ b/cbios/mm.180
@@ -3,20 +3,30 @@
 
 
        global mmuinit
-       global bnk2log,bnk2phy,hwl2phy
+       global bnk2log,bnk2phy,hwl2phy,phy2log
 
        include config.inc
        include z180reg.inc
 
 
 ;----------------------------------------------------------------------
-; Memory Map:
+; Memory Map 1:
 ;
-;      Common  CAStart ...     0FFFF
-;      Bank 0    00000 ... CAStart-1
-;      Bank 1    10000 ...
+;      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
@@ -32,20 +42,55 @@ mmuinit:
 ; 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
+       dec     a               ;
        push    bc              ;
-       ld      b,a             ;
-       ld      c,CA            ;
+       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
@@ -62,13 +107,16 @@ bnk2phy:
        cp      CA*16
        ld      a,c
        pop     bc
-
        jr      c,b2p_banked
-       xor     a               ; address is in common
-       jr      b2b_cont        ;    base is 0
+                               ; 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
-b2b_cont:
 
        ; fall thru
 
@@ -102,10 +150,10 @@ l2p_i:
 
 ;--------------------------------------------------------------
 ;
-; de: Log. Address
+; hl: Log. Address
 ;
 ;
-; OP: ahl = (bankbase<<12) + (d<<8) + e
+; OP: ahl = (bankbase<<12) + (h<<8) + l
 ;
 ;out ahl: Phys. (linear) Address
 
@@ -137,6 +185,30 @@ hl2p_x:
        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