emul/8086: wip

emul/8086/Makefile

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+TARGETS = forth 
+OBJS = cpu.o
+CDIR = ../../cvm
+STAGE = $(CDIR)/stage
+BLKFS = $(CDIR)/blkfs
+
+.PHONY: all
+all: $(TARGETS)
+
+forth: forth.c $(OBJS)
+	$(CC) forth.c $(OBJS) -lncurses -o $@
+
+emul.o: emul.c forth.bin $(BLKFS)
+	$(CC) -DFBIN_PATH=\"`pwd`/forth.bin\" -DBLKFS_PATH=\"`pwd`/$(BLKFS)\" -c -o emul.o emul.c
+
+forth.bin: xcomp.fs $(STAGE) $(BLKFS)
+	$(CDIR)/stage < xcomp.fs > $@
+
+$(BLKFS): $(STAGE)
+
+$(STAGE):
+	$(MAKE) -C $(CDIR) all
+
+.PHONY: clean
+clean:
+	rm -f $(TARGETS) $(OBJS) forth.bin
+

emul/8086/README.md

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+# 8086 emulator
+
+This is a work in progress. The goal is to have something lighter than QEMU to
+run Collapse OS on and also something that is easier to plug with my stuff.
+Something I could run without BIOS (have my own studs for INT 10 and INT 13).
+
+My first try was with 8086tiny, but this code is messy. Fake86 is a bit bigger,
+but also cleaner.

emul/8086/cpu.h

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+void exec86(int execloops);
+void reset86();
+void printregs();

emul/8086/forth.c

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+#include <stdint.h>
+#include <stdio.h>
+#include "cpu.h"
+
+extern uint8_t	RAM[0x100000];
+
+int main(int argc, char *argv[])
+{
+    int i = 0;
+    int ch = 0;
+
+    reset86();
+    ch = getchar();
+    while (ch != EOF) {
+        RAM[i++] = ch;
+        ch = getchar();
+    }
+    printregs();
+    exec86(1);
+    printregs();
+    return 0;
+}