zeta-v2: go back to old compiler for now

Too much mess in this tree needs cleaning up first

Kernel/platform/platform-zeta-v2/Makefile

@@ -1,56 +1,56 @@
-ASRCS = crt0.S tricks.S commonmem.S zeta-v2.S monitor.S
-ASRCS += devrd_zeta2_hw.S
+ASRCS = crt0.s tricks.s commonmem.s zeta-v2.s monitor.s
+ASRCS += ds1302-n8vem.s devrd_zeta2_hw.s
 CSRCS = devices.c main.c devtty.c devrd_zeta2.c
 DISCARD_CSRCS = discard.c devtty_discard.c
 DISCARD_DSRCS = ../../dev/ds1302_discard.c ../../dev/tinyide_discard.c ../../dev/tinydisk_discard.c
 DSRCS = ../../dev/devfd.c ../../dev/tinydisk.c ../../dev/tinyide.c
 DSRCS += ../../dev/ds1302.c ../../dev/devrd.c ../../dev/tinyide_ppide_rbc.c
-DASRCS = ../../dev/devfd_hw.S ../../dev/devrd_hw.S ../../dev/ds1302_rbc.S
+DASRCS = ../../dev/devfd_hw.s ../../dev/devrd_hw.s
 
-AOBJS = $(ASRCS:.S=.o)
-COBJS = $(CSRCS:.c=.o)
-DISCARD_COBJS = $(DISCARD_CSRCS:.c=.o)
-DISCARD_DOBJS = $(patsubst ../../dev/%.c,%.o, $(DISCARD_DSRCS))
-DOBJS = $(patsubst ../../dev/%.c,%.o, $(DSRCS))
-DAOBJS = $(patsubst ../../dev/%.S,%.o, $(DASRCS))
+AOBJS = $(ASRCS:.s=.rel)
+COBJS = $(CSRCS:.c=.rel)
+DISCARD_COBJS = $(DISCARD_CSRCS:.c=.rel)
+DISCARD_DOBJS = $(patsubst ../../dev/%.c,%.rel, $(DISCARD_DSRCS))
+DOBJS = $(patsubst ../../dev/%.c,%.rel, $(DSRCS))
+DAOBJS = $(patsubst ../../dev/%.s,%.rel, $(DASRCS))
 
 OBJS  = $(AOBJS) $(COBJS) $(DOBJS) $(DAOBJS) $(DISCARD_DOBJS) $(DISCARD_COBJS)
 
 CROSS_CCOPTS += -I../../dev/
 
-JUNK = *.o *.lst *.asm *.sym *.rst *.map *.ihx *.bin
+JUNK = *.rel *.lst *.asm *.sym *.rst *.map *.ihx *.bin
 
 all:	$(OBJS) diskboot.bin
 
-$(AOBJS): %.o: %.S
+$(AOBJS): %.rel: %.s
 	$(CROSS_AS) $(ASOPTS) $<
 
-$(COBJS): %.o: %.c
+$(COBJS): %.rel: %.c
 	$(CROSS_CC) $(CROSS_CCOPTS) -c $<
 
-$(DOBJS): %.o: ../../dev/%.c
+$(DOBJS): %.rel: ../../dev/%.c
 	$(CROSS_CC) $(CROSS_CCOPTS) -c $<
 
-$(DAOBJS): %.o: ../../dev/%.S
+$(DAOBJS): %.rel: ../../dev/%.s
 	$(CROSS_AS) $(ASOPTS) $@ $<
 
-$(DISCARD_COBJS): %.o: %.c
+$(DISCARD_COBJS): %.rel: %.c
 	$(CROSS_CC) $(CROSS_CCOPTS) $(CROSS_CC_SEGDISC) -c $<
 
-$(DISCARD_DOBJS): %.o: ../../dev/%.c
+$(DISCARD_DOBJS): %.rel: ../../dev/%.c
 	$(CROSS_CC) $(CROSS_CCOPTS) $(CROSS_CC_SEGDISC) -c $<
 
 clean:
 	rm -f $(OBJS) $(JUNK)  core *~ bootrom.ihx bootrom.bin diskboot.bin fuzix.com fuzix.rom
 
-diskboot.bin:	diskboot.S
-	$(CROSS_AS) $(ASOPTS) diskboot.S
-	sdldz80 -nmi diskboot.o
+diskboot.bin:	diskboot.s
+	$(CROSS_AS) $(ASOPTS) diskboot.s
+	sdldz80 -nmi diskboot.rel
 	makebin -s 65536 diskboot.ihx | dd bs=512 skip=125 count=1 of=diskboot.bin
 
 image:
-	sdasz80 -o bootrom.S
-	sdldz80 -m -i bootrom.o
+	sdasz80 -o bootrom.s
+	sdldz80 -m -i bootrom.rel
 	makebin -s 136 bootrom.ihx > bootrom.bin
 	# Work around bugs in Fedora dd
 	cat bootrom.bin ../../fuzix.bin > fuzix.tmp

Kernel/platform/platform-zeta-v2/devrd_zeta2.c

@@ -0,0 +1,45 @@
+/* Zeta SBC V2  memory driver
+ *
+ * 2017-01-03 William R Sowerbutts, based on RAM disk code by Sergey Kiselev
+ */
+
+#include <kernel.h>
+#include <kdata.h>
+#include <printf.h>
+#define DEVRD_PRIVATE
+#include "devrd.h"
+
+void rd_page_copy(void); // devrd_zeta2_hw.s
+
+void rd_plt_copy(void)
+{
+    uint16_t ocount, count, maxcpy;
+
+    ocount = count = rd_cpy_count;
+
+    while(true){
+        /* ensure transfer will not span a 16KB bank boundary */
+        maxcpy = ((uint16_t)rd_src_address) & 0x3FFF;
+        if((rd_dst_address & 0x3FFF) > maxcpy)
+            maxcpy = rd_dst_address & 0x3FFF;
+        maxcpy = 0x4000 - maxcpy;
+        if(rd_cpy_count > maxcpy)
+            rd_cpy_count = maxcpy;
+#ifdef DEBUG
+        kprintf("rd_transfer: src=0x%lx, dst=0x%x(%s) reverse=%d count=%d\n",
+                rd_src_address, rd_dst_address, rd_dst_userspace?"user":"kern",
+                rd_reverse, rd_cpy_count);
+#endif
+        rd_page_copy();
+
+        count -= rd_cpy_count;
+        if(!count)
+            break;
+
+        rd_dst_address += rd_cpy_count;
+        rd_src_address += rd_cpy_count;
+        rd_cpy_count = count;
+    }
+
+    rd_cpy_count = ocount;
+}