WonderWitch/Filesystem: Difference between revisions
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(Created page with "== Mount points == {| class="wikitable" |+ FreyaOS mount points |- ! Path !! File data location !! File table location !! File table size (entries) !! Description |- | <code>/rom0</code> || ROM (384 KB) || SRAM bank 3, $16F2 || 128 || |- | <code>/ram0</code> || SRAM bank 0 (64 KB) || SRAM bank 3, $06F2 || 64 || |- | <code>/</code> || || SRAM bank 3, $02F2 || 16 || |} == File table entry format == {| class="wikitable" |+ Header contents |- ! Offset !! Length !! Conten...") |
(→Timestamp format: Ranges) |
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| 50 || 2 || File mode | | 50 || 2 || File mode | ||
|- | |- | ||
| 52 || 4 || Modification time | | 52 || 4 || Modification time | ||
|- | |- | ||
| 56 || 4 || TODO | | 56 || 4 || TODO | ||
|- | |- | ||
| 60 || 4 || Offset to resource data, bytes excluding header; -1 if not present. | | 60 || 4 || Offset to resource data, bytes excluding header; -1 if not present. | ||
|} | |||
=== Timestamp format === | |||
{| class="wikitable" | |||
|+ Header contents | |||
|- | |||
! Bits !! Contents | |||
|- | |||
| 31 - 25 || Year, 0 .. (starting from 2000) | |||
|- | |||
| 24 - 21 || Month, 1 .. 12 | |||
|- | |||
| 20 - 16 || Day, 1 .. 31 | |||
|- | |||
| 15 - 11 || Hour, 0 .. 23 | |||
|- | |||
| 10 - 5 || Minute, 0 .. 59 | |||
|- | |||
| 0 - 4 || Second, 0 .. 29 (in two-second units) | |||
|} | |} | ||
Latest revision as of 17:34, 9 March 2025
Mount points
| Path | File data location | File table location | File table size (entries) | Description |
|---|---|---|---|---|
/rom0 |
ROM (384 KB) | SRAM bank 3, $16F2 | 128 | |
/ram0 |
SRAM bank 0 (64 KB) | SRAM bank 3, $06F2 | 64 | |
/ |
SRAM bank 3, $02F2 | 16 |
File table entry format
| Offset | Length | Contents |
|---|---|---|
| 0 | 16 | File name; zero-terminated Shift-JIS string. |
| 16 | 24 | User-friendly file name; zero-terminated Shift-JIS string.
FreyaOS displays the first 12 characters in its file selector. |
| 40 | 4 | Location in CPU address space (segment:offset) |
| 44 | 4 | Total file size, in bytes, excluding the header. |
| 48 | 2 | XMODEM chunk count - above file size divided by 128, then rounded up. |
| 50 | 2 | File mode |
| 52 | 4 | Modification time |
| 56 | 4 | TODO |
| 60 | 4 | Offset to resource data, bytes excluding header; -1 if not present. |
Timestamp format
| Bits | Contents |
|---|---|
| 31 - 25 | Year, 0 .. (starting from 2000) |
| 24 - 21 | Month, 1 .. 12 |
| 20 - 16 | Day, 1 .. 31 |
| 15 - 11 | Hour, 0 .. 23 |
| 10 - 5 | Minute, 0 .. 59 |
| 0 - 4 | Second, 0 .. 29 (in two-second units) |
File modes
15 bit 8 7 bit 0
---- ---- ---- ----
???? ???? dlis mrwx
|||| ||||
|||| |||+- Execute
|||| ||+-- Write
|||| |+--- Read
|||| +---- Prohibit mmap() use
|||+------ StreamIL-related?
||+------- Intermediate library
|+-------- Symbolic link
+--------- Directory
