feat(tools): dump bpb info

.gitignore

@@ -2,6 +2,7 @@
 *.img
 *.bin
 *.iso
+*.exe
 *~
 \#*\#
 
@@ -11,7 +12,7 @@
 vmstupid
 vmstupid-dbg
 
-
+/tools/fat
 /sysroot
 
 log.txt

Makefile

@@ -1,14 +1,22 @@
+.EXPORT_ALL_VARIABLES:
+
 TOPDIR     := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
 SYSROOTDIR := $(TOPDIR)/sysroot
 TOOLSDIR   := $(TOPDIR)/tools
 
 RM = echo
 
-SUBDIRS	:= boot kernel lib bin
+MK_BUGREPORT := \"https://git.cute.engineering/d0p1/StupidOS/issues\"
+MK_COMMIT    := \"$(shell git rev-parse --short HEAD)\"
+
+SUBDIRS	:= tools boot kernel lib bin
 
 TARGET	= stupid.tar.gz floppy_boot.img
 ifneq ($(OS),Windows_NT)
-TARGET	+= stupid.iso
+EXEXT	=
+TARGET	+= stupid.iso stdupid.hdd
+else
+EXEXT	= .exe
 endif
 
 .PHONY: all
@@ -26,17 +34,32 @@ $(SUBDIRS):
 stupid.iso: $(SUBDIRS)
 	$(TOPDIR)/tools/create-iso $@ sysroot
 
+.PHONY: stupid.hdd
+stupid.hdd: $(SUBDIRS)
+	@echo ""
+
 .PHONY: stupid.tar.gz
 stupid.tar.gz: $(SUBDIRS)
 	tar -czvf $@ sysroot
 
 .PHONY: floppy_boot.img
-floppy_boot.img:
+floppy_boot.img: $(SUBDIRS)
 	dd if=/dev/zero of=$@ bs=512 count=1440
 	mformat -C -f 1440 -i $@
 	dd if=boot/bootsector.bin of=$@ conv=notrunc
 	mcopy -i $@ boot/stpdboot.sys ::/STPDBOOT.SYS
-	mcopy -i $@ kernel/vmstupid ::/VMSTUPID.SYS
+	mcopy -i $@ kernel/vmstupid.sys ::/VMSTUPID.SYS
+
+.PHONY: run
+run: all
+	qemu-system-i386 \
+		-rtc base=localtime \
+		-drive file=floppy_boot.img,if=none,format=raw,id=boot \
+		-drive file=fat:rw:./sysroot,if=none,id=hdd \
+		-device floppy,drive=boot \
+		-device ide-hd,drive=hdd \
+		-global isa-fdc.bootindexA=0 \
+		-serial mon:stdio
 
 .PHONY: clean
 clean: $(SUBDIRS)

tools/Makefile

@@ -0,0 +1,16 @@
+CC	= gcc
+RM	= rm -f
+
+TARGET	= fat$(EXEXT)
+
+CFLAGS	= -DMK_COMMIT="$(MK_COMMIT)" -DMK_BUGREPORT="$(MK_BUGREPORT)"
+LDFLAGS	=
+
+.PHONY: all
+all: $(TARGET)
+
+fat$(EXEXT): fat.c
+	$(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
+
+.PHONY: install
+install: $(TARGET)

tools/fat.c

@@ -0,0 +1,132 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdarg.h>
+#include <libgen.h>
+#include <errno.h>
+
+typedef struct
+{
+  uint8_t jmp[3];
+  uint8_t OEM[8];
+  uint16_t bytes_per_sector;
+  uint8_t sectors_per_cluster;
+  uint16_t reserved_sectors;
+  uint8_t number_of_FATs;
+  uint16_t root_entries;
+  uint16_t logical_sectors;
+  uint8_t media_descriptor;
+  uint16_t sectors_per_FAT;
+  uint16_t sectors_per_track;
+  uint16_t heads_per_cylinder;
+  uint32_t hidden_sectors;
+  uint32_t total_sectors;
+
+  /* EBPB */
+  uint8_t drive_number;
+  uint8_t flags;
+  uint8_t signature;
+  uint32_t serial;
+  uint8_t label[11];
+  uint8_t fs_type[8];
+} __attribute__((packed)) BiosParamBlock;
+
+static const char *prg_name;
+
+static void
+fatal(const char *str, ...)
+{
+  va_list ap;
+
+  fprintf(stderr, "%s: ", prg_name);
+  va_start(ap, str);
+  vfprintf(stderr, str, ap);
+  va_end(ap);
+  fprintf(stderr, "\n");
+
+  exit(EXIT_FAILURE);
+}
+
+static void
+dump(const char *img)
+{
+  FILE *fp;
+  BiosParamBlock bpb;
+  char label[12];
+
+  fp = fopen(img, "rb");
+  if (fp == NULL) fatal("Can't open '%s': %s", img, strerror(errno));
+
+  if (fread(&bpb, 1, sizeof(BiosParamBlock), fp) != sizeof(BiosParamBlock))
+    {
+      fatal("Can't read BPB");
+    }
+
+  printf("Bytes per logical sector: %hd\n", bpb.bytes_per_sector);
+  printf("Logical sectors per cluster: %d\n", bpb.sectors_per_cluster);
+  memset(label, 0, 12);
+  strncpy(label, bpb.label, 11);
+  printf("Label: '%s'\n", label);
+  printf("signature: %X\n", bpb.signature);
+  fclose(fp);
+  exit(EXIT_SUCCESS);
+}
+
+static void
+usage(int retcode)
+{
+  if (retcode == EXIT_FAILURE)
+    {
+      fprintf(stderr, "Try '%s -h' form more information.\n", prg_name);
+    }
+  else
+    {
+      printf("Usage: %s [-hV] [-D IMG] [-b BIN]\n", prg_name);
+      printf("\t-h\tdisplay this help and exit\n");
+      printf("\t-V\toutput version information\n");
+      printf("\t-D IMG\tdump fs information from IMG\n");
+
+      printf("\nReport bugs to <%s>\n", MK_BUGREPORT);
+    }
+  exit(retcode);
+}
+
+static void
+version(void)
+{
+  printf("%S commit %s\n", prg_name, MK_COMMIT);
+  exit(EXIT_SUCCESS);
+}
+
+int
+main(int argc, char **argv)
+{
+  prg_name = argv[0];
+
+  while ((argc > 1) && (argv[1][0] == '-'))
+    {
+      switch (argv[1][1])
+	{
+	case 'h':
+	  usage(EXIT_SUCCESS);
+	  break;
+	case 'V':
+	  version();
+	  break;
+	case 'D':
+	  argv++;
+	  argc--;
+	  if (argc <= 1) usage(EXIT_FAILURE);
+	  dump(argv[1]);
+	  break;
+	default:
+	  usage(EXIT_FAILURE);
+	  break;
+	}
+
+      argv++;
+      argc--;
+    }
+  return (EXIT_SUCCESS);
+}