-all: makecpmloader cpmload.bin
+all: makecpmloader cpmload.bin fuzixload.bin
makecpmloader: makecpmloader.c
sdldz80 -nmi cpmload.rel
makebin -p cpmload.ihx > cpmload.bin
+fuzixload.bin: fuzixload.s
+ $(CROSS_AS) $(ASOPTS) fuzixload.s
+ sdldz80 -nmi fuzixload.rel
+ makebin -p fuzixload.ihx > fuzixload.bin
+
clean:
rm -f *~ *.rst *.lst *.asm *.bin *.sym *.rel *.map *.ihx makecpmloader
--- /dev/null
+ .module fuzixload
+
+ .area _LOADER (ABS)
+ .org 0x100
+
+start: ; jump to start of code
+ jp start2
+
+ ; fuzix executable header --------------------------
+ .db 'F'
+ .db 'Z'
+ .db 'X'
+ .db '1'
+
+ .db 0x01 ; page to load at
+ .dw 0 ; chmem ("0 - 'all'")
+ .dw 0 ; gives us code size info
+ .dw 0 ; gives us data size info
+ .dw 0 ; bss size info
+ .dw 0 ; spare
+ ; --------------------------------------------------
+
+msg: .ascii 'booting ...\r\n'
+endmsg:
+
+start2:
+ ; sync()
+ ld hl, #11 ; syscall #
+ push hl
+ rst #0x30 ; execute
+
+ ; write(0, msg, strlen(msg));
+ ld hl, #(endmsg-msg) ; count
+ push hl
+ ld hl, #msg ; buffer
+ push hl
+ ld hl, #0 ; fd
+ push hl
+ ld hl, #8 ; syscall #
+ push hl
+ rst #0x30 ; execute
+
+ ; sync()
+ ld hl, #11 ; syscall #
+ push hl
+ rst #0x30 ; execute
+
+ di ; now we steal control of the machine from the old kernel!
+
+ ld de, #0 ; copy ourselves to bottom of RAM
+ ld hl, #(doload) ; start of loader code
+ ld bc, #(endloader-doload) ; length of our loader
+ ldir ; copy copy copy!
+ ld hl, (load_address)
+ ld sp, hl ; stash copy of entry vector in SP for now
+ ex de, hl ; load_address to de
+ ld hl, #payload_start
+ ld bc, (load_length)
+ jp 0 ; jump and perform copy in low memory
+
+ ; this code gets copied to .org 0
+doload:
+ ldir ; copy image into correct place
+ ld hl, #0
+ add hl, sp ; recover entry vector
+ jp (hl) ; run image
+endloader: ; end of code to copy
+
+ ; the data is in a trailer, with a 4-byte header:
+load_address:
+ .ds 2
+load_length:
+ .ds 2
+payload_start:
public / FUZIX.git / commitdiff