msx1: note where we need to do work on subslots

diff --git a/Kernel/platform-msx1/crt0.s b/Kernel/platform-msx1/crt0.s
index 2bfec4c..896686d 100644 (file)
--- a/Kernel/platform-msx1/crt0.s
+++ b/Kernel/platform-msx1/crt0.s
@@ -4,6 +4,7 @@
                .area _LOW
                .area _HEADER
                .area _CODE2
+               ; We need this to be above 0x8000
                .area _HOME
                .area _VIDEO
                ; RAM based or may be copied to/from by the user

diff --git a/Kernel/platform-msx1/slots.s b/Kernel/platform-msx1/slots.s
index 37908d5..ccac34a 100644 (file)
--- a/Kernel/platform-msx1/slots.s
+++ b/Kernel/platform-msx1/slots.s
@@ -490,6 +490,17 @@ next_slot:
        ;
        ;
 sub_scan:
+       ;
+       ;       FIXME: We can't map the low 48K to get our subslots the way
+       ;       we do now because we are running at C000-FFFF. If we map a
+       ;       different 0x0000-0x3FFF we can't get back because we no
+       ;       longer have low stubs for our return.
+       ;
+       ;       We need to fix this to use high stubs to map the low 16K
+       ;       scan that, and then use low stubs to map the middle 32K
+       ;       (high stubs don't work as we have to swap the top 16K to
+       ;       deal with the brain dead mapping scheme)
+       ;
        ld l,a                  ; Remember our A8 bits
        push de                 ; Save slot number (E)
 
@@ -539,7 +550,7 @@ next_sub:
        djnz next_sub
 
        ;
-       ;       Restore the saved subslot
+       ;       Restore the saved subslot.
        ;
        pop af
        ld b,c