mirror of https://github.com/zellyn/diskii.git
135 lines
3.9 KiB
Go
135 lines
3.9 KiB
Go
// Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
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package cmd
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import (
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"fmt"
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"os"
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"github.com/spf13/cobra"
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"github.com/zellyn/diskii/disk"
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"github.com/zellyn/diskii/helpers"
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)
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var sdAddress uint16 // flag for address to load at
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var sdStart uint16 // flag for address to start execution at
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// mksdCmd represents the mksd command
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var mksdCmd = &cobra.Command{
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Use: "mksd",
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Short: "create a Standard-Delivery disk image",
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Long: `diskii mksd creates a "Standard Delivery" disk image containing a binary.
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See https://github.com/peterferrie/standard-delivery for details.
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Examples:
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mksd test.dsk foo.o # load and run foo.o at the default address, then jump to the start of the loaded code.
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mksd test.dsk foo.o --address 0x2000 --start 0x2100 # load foo.o at address 0x2000, then jump to 0x2100.`,
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Run: func(cmd *cobra.Command, args []string) {
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if err := runMkSd(args); err != nil {
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fmt.Fprintln(os.Stderr, err.Error())
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os.Exit(-1)
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}
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},
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}
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func init() {
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RootCmd.AddCommand(mksdCmd)
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mksdCmd.Flags().Uint16VarP(&sdAddress, "address", "a", 0x6000, "memory location to load code at")
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mksdCmd.Flags().Uint16VarP(&sdStart, "start", "s", 0x6000, "memory location to jump to")
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}
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// ----- mksd command -------------------------------------------------------
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// runMkSd performs the actual mksd logic.
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func runMkSd(args []string) error {
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if len(args) != 2 {
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return fmt.Errorf("usage: diskii mksd <disk image> <file-to-load>")
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}
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contents, err := helpers.FileContentsOrStdIn(args[1])
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if err != nil {
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return err
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}
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if sdAddress%256 != 0 {
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return fmt.Errorf("address %d (%04X) not on a page boundary", sdAddress, sdAddress)
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}
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if sdStart < sdAddress {
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return fmt.Errorf("start address %d (%04X) < load address %d (%04X)", sdStart, sdStart, sdAddress, sdAddress)
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}
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if int(sdStart) >= int(sdAddress)+len(contents) {
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end := int(sdAddress) + len(contents)
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return fmt.Errorf("start address %d (%04X) is beyond load address %d (%04X) + file length = %d (%04X)",
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sdStart, sdStart, sdAddress, sdAddress, end, end)
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}
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if int(sdStart)+len(contents) > 0xC000 {
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end := int(sdStart) + len(contents)
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return fmt.Errorf("start address %d (%04X) + file length %d (%04X) = %d (%04X), but we can't load past page 0xBF00",
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sdStart, sdStart, len(contents), len(contents), end, end)
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}
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sectors := (len(contents) + 255) / 256
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loader := []byte{
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0x01, 0xa8, 0xee, 0x06, 0x08, 0xad, 0x4e, 0x08, 0xc9, 0xc0, 0xf0, 0x40, 0x85, 0x27, 0xc8,
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0xc0, 0x10, 0x90, 0x09, 0xf0, 0x05, 0x20, 0x2f, 0x08, 0xa8, 0x2c, 0xa0, 0x01, 0x84, 0x3d,
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0xc8, 0xa5, 0x27, 0xf0, 0xdf, 0x8a, 0x4a, 0x4a, 0x4a, 0x4a, 0x09, 0xc0, 0x48, 0xa9, 0x5b,
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0x48, 0x60, 0xe6, 0x41, 0x06, 0x40, 0x20, 0x37, 0x08, 0x18, 0x20, 0x3c, 0x08, 0xe6, 0x40,
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0xa5, 0x40, 0x29, 0x03, 0x2a, 0x05, 0x2b, 0xa8, 0xb9, 0x80, 0xc0, 0xa9, 0x30, 0x4c, 0xa8,
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0xfc, 0x4c, byte(sdStart), byte(sdStart >> 8),
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}
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if len(loader)+sectors+1 > 256 {
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return fmt.Errorf("file %q is %d bytes long, max is %d", args[1], len(contents), (255-len(loader))*256)
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}
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for len(contents)%256 != 0 {
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contents = append(contents, 0)
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}
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diskbytes := make([]byte, disk.FloppyDiskBytes)
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var track, sector byte
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for i := 0; i < len(contents); i += 256 {
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sector += 2
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if sector >= disk.FloppySectors {
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sector = (disk.FloppySectors + 1) - sector
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if sector == 0 {
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track++
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if track >= disk.FloppyTracks {
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return fmt.Errorf("ran out of tracks")
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}
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}
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}
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address := int(sdAddress) + i
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loader = append(loader, byte(address>>8))
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if err := disk.WriteSector(diskbytes, track, sector, contents[i:i+256]); err != nil {
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return err
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}
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}
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loader = append(loader, 0xC0)
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for len(loader) < 256 {
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loader = append(loader, 0)
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}
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if err := disk.WriteSector(diskbytes, 0, 0, loader); err != nil {
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return err
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}
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f, err := os.Create(args[0])
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if err != nil {
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return err
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}
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return fmt.Errorf("write not implemented")
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//_, err = sd.Write(f)
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if err != nil {
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return err
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}
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if err = f.Close(); err != nil {
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return err
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}
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return nil
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}
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