Add some basic fat32 code

sw/test_code/fs_test/Makefile

@@ -0,0 +1,48 @@
+CC=../../cc65/bin/cl65
+LD=../../cc65/bin/cl65
+SIM=../../cc65/bin/sim65 
+CFLAGS=-T -t sim65c02 -I.
+LDFLAGS=-m $(NAME).map
+
+NAME=fs_test
+
+BIN=$(NAME).bin
+
+FS=$(REPO_TOP)/sw/script/fs.fat
+
+LISTS=lists
+
+EXT_SRCS=$(REPO_TOP)/sw/kernel/filesystems/fat32.s
+
+SRCS=$(wildcard *.s) $(wildcard *.c)
+SRCS+=$(wildcard **/*.s) $(wildcard **/*.c)
+OBJS+=$(patsubst %.s,%.o,$(filter %s,$(SRCS)))
+OBJS+=$(patsubst %.c,%.o,$(filter %c,$(SRCS)))
+
+run: all
+	$(SIM) $(BIN)
+
+all: fs.fat fat32.s $(BIN)
+
+$(BIN): $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) -o $@
+
+%.o: %.c $(LISTS)
+	$(CC) $(CFLAGS) -l $(LISTS)/$<.list -c $< -o $@
+
+%.o: %.s $(LISTS)
+	$(CC) $(CFLAGS) -l $(LISTS)/$<.list -c $< -o $@
+
+fat32.s: $(EXT_SRCS)
+	cp $^ .
+
+fs.fat: $(FS)
+	cp $^ .
+
+$(LISTS):
+	mkdir -p $(addprefix $(LISTS)/,$(sort $(dir $(SRCS))))
+
+.PHONY: clean
+clean:
+	rm -rf $(OBJS) $(BIN) $(HEX) $(LISTS) $(NAME).map fat32.s
+

sw/test_code/fs_test/asm_harness.s

@@ -0,0 +1,5 @@
+.import _printf
+.export _cprintf
+
+_cprintf:
+    jmp _printf

sw/test_code/fs_test/harness.c

@@ -0,0 +1,21 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE_PATH "fs.fat"
+
+uint32_t lmulii(uint16_t a, uint16_t b) {
+    printf("lmulii: %x * %x = %x\n", a, b, a*b);
+    return a * b;
+}
+
+uint16_t imulii(uint16_t a, uint16_t b) {
+    printf("imulii: %x * %x = %x\n", a, b, a*b);
+    return a * b;
+}
+
+uint8_t SD_readSingleBlock(uint32_t addr, uint8_t *buf, uint8_t *error) {
+    FILE* f = fopen(FILE_PATH, "rb");
+    // fseek(f, addr * 512, SEEK_SET);
+    fread(buf, 512, 1, f);
+}

sw/test_code/fs_test/main.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+void fat32_init(void);
+
+int main(void) {
+    printf("Hello, world!\n");
+    fat32_init();
+    return 0;
+}