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fox32os/kernel/vfs/vfs.asm

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Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; virtual filesystem routines
; file struct for file:
; file_disk: 1 byte
; file_first_sector: 2 bytes
; file_seek_offset: 4 bytes
; file_system_type: 1 byte (0x00 for RYFS)
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
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; file_reserved_1: 4 bytes
; file_reserved_2: 4 bytes
; file_reserved_3: 4 bytes
; file_reserved_4: 4 bytes
; file_reserved_5: 4 bytes
; file_reserved_6: 4 bytes
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; file struct for stream:
; file_reserved_1: 1 byte
; file_reserved_2: 2 bytes
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
; file_seek_offset: 4 bytes
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; file_system_type: 1 byte (0x01 for stream)
; file_read_call: 4 bytes
; file_write_call: 4 bytes
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
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; file_size: 4 bytes
; file_reserved_3: 4 bytes
; file_reserved_4: 4 bytes
; file_reserved_5: 4 bytes
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; open a file from a RYFS-formatted disk, or a named stream
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; inputs:
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; r0: pointer to file name string (8.3 format if file, for example "testfile.txt" or "test.txt")
; r1: disk ID (ignored if stream)
; r2: file struct: pointer to a blank file struct (8 bytes if file, 16 bytes if stream)
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; outputs:
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; r0: if file: first file sector, or zero if file wasn't found
; if stream: non-zero if stream opened, or zero if not
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
open:
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
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cmp.8 [r0], ':'
ifz jmp open_stream
kernel+apps: Use a more standard filename format (8.3 with no spaces)
2023-03-16 01:53:45 +01:00
call convert_filename
cmp r0, 0
ifz ret
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
jmp ryfs_open
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
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open_stream:
push r1
inc r0
; fb
mov r1, framebuffer_vfs_stream_name
call compare_string
ifz pop r1
ifz jmp open_stream_fb
kernel/vfs: Add :serial named stream
2023-04-02 22:08:55 +02:00
; serial
mov r1, serial_vfs_stream_name
call compare_string
ifz pop r1
ifz jmp open_stream_serial
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
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pop r1
mov r0, 0
ret
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; seek specified file to the specified offset
; inputs:
; r0: byte offset
; r1: pointer to file struct
; outputs:
; none
seek:
kernel/vfs: Support seeking in streams
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jmp ryfs_seek
Implement a basic VFS layer with "streams"
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; get the seek offset of the specified file
; inputs:
; r0: pointer to file struct
; outputs:
; r0: byte offset
tell:
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
jmp ryfs_tell
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; get the exact size of the specified file
; inputs:
; r0: pointer to file struct
; outputs:
; r0: size in bytes
get_size:
push r1
push r0
add r0, 7
movz.8 r1, [r0]
pop r0
cmp.8 r1, 0x00
ifz pop r1
ifz jmp ryfs_get_size
cmp.8 r1, 0x01
ifz pop r1
ifz jmp stream_get_size
pop r1
ret
stream_get_size:
add r0, 16
mov r0, [r0]
ret
Implement a basic VFS layer with "streams"
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; read specified number of bytes into the specified buffer
; inputs:
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
; r0: number of bytes to read
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; r1: pointer to file struct
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
; r2: pointer to destination buffer
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; outputs:
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; none
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
read:
push r3
push r1
add r1, 7
movz.8 r3, [r1]
pop r1
cmp.8 r3, 0x00
ifz pop r3
ifz jmp ryfs_read
cmp.8 r3, 0x01
ifz pop r3
ifz jmp stream_read
pop r3
ret
stream_read:
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
push r0
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
push r1
push r2
stream_read_loop:
call stream_read_char
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
push r0
push r2
call yield_task
pop r2
pop r0
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
inc r2
dec r0
ifnz jmp stream_read_loop
pop r2
pop r1
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
pop r0
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
ret
stream_read_char:
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
push r0
push r1
push r2
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
; call [file_read_call] with seek offset in r0
add r1, 2
mov r0, [r1]
add r1, 6
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
call [r1]
; put the result into [r2]
pop r2
kernel/vfs: Don't ignore buffer length in read(stream)
2023-01-30 21:28:33 +01:00
mov.8 [r2], r0
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; increment the seek offset
sub r1, 6
inc [r1]
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
pop r1
pop r0
ret
; write specified number of bytes into the specified file
; inputs:
kernel/vfs: Don't ignore buffer length in write(stream)
2023-01-30 20:42:21 +01:00
; r0: number of bytes to write
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; r1: pointer to file struct
kernel/vfs: Update outdated comment
2023-02-09 01:05:08 +01:00
; r2: pointer to source buffer
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
; outputs:
; none
write:
push r3
push r1
add r1, 7
movz.8 r3, [r1]
pop r1
cmp.8 r3, 0x00
ifz pop r3
Implement RYFS write support in the VFS
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ifz jmp ryfs_write
Implement a basic VFS layer with "streams"
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cmp.8 r3, 0x01
ifz pop r3
ifz jmp stream_write
pop r3
ret
stream_write:
kernel/vfs: Don't ignore buffer length in write(stream)
2023-01-30 20:42:21 +01:00
push r31
push r2
mov r31, r0 ; number of bytes to write = loop count
stream_write_loop:
call stream_write_char
inc r2
loop stream_write_loop
pop r2
pop r31
ret
stream_write_char:
Implement a basic VFS layer with "streams"
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push r0
push r1
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
push r3
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
; call [file_write_call] with pointer to src buf in r0 and seek offset in r1
mov r3, r1
add r3, 2
Implement a basic VFS layer with "streams"
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mov r0, r2
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
mov r1, [r3]
add r3, 10
call [r3]
Implement a basic VFS layer with "streams"
2022-10-15 01:39:40 +02:00
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; increment the seek offset
sub r3, 10
inc [r3]
kernel/vfs: Support seeking in streams
2023-03-31 03:14:16 +02:00
pop r3
Implement a basic VFS layer with "streams"
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pop r1
pop r0
ret
kernel+apps: Use a more standard filename format (8.3 with no spaces)
2023-03-16 01:53:45 +01:00
; convert a user-friendly filename (test.txt) to the internal representation (test txt)
; inputs:
; r0: pointer to null-terminated input string
; outputs:
; r0: pointer to null-terminated output string, or zero if failure
convert_filename:
push r1
push r2
push r3
push r31
; check the length of the filename to ensure it isn't too long
mov r1, r0
call string_length
cmp r0, 12
ifgt jmp convert_filename_fail
cmp r0, 0
ifz jmp convert_filename_fail
; fill the output string buffer with spaces and a null-terminator
mov r2, convert_filename_output_string
mov r31, 11
convert_filename_space_loop:
mov.8 [r2], ' '
inc r2
loop convert_filename_space_loop
mov.8 [r2], 0
mov r2, convert_filename_output_string
mov r3, 0
; r0: input filename length
; r1: pointer to input filename
; r2: pointer to output filename
; r3: number of characters processed
convert_filename_copy_loop:
cmp.8 [r1], '.'
ifz jmp convert_filename_found_ext
mov.8 [r2], [r1]
inc r1
inc r2
inc r3
cmp r3, r0
ifz jmp convert_filename_done
iflt jmp convert_filename_copy_loop
convert_filename_found_ext:
cmp r3, 0
ifz jmp convert_filename_fail
cmp r3, 8
ifgt jmp convert_filename_fail
mov r2, convert_filename_output_string
add r2, 8
inc r1
cmp.8 [r1], 0
ifz jmp convert_filename_fail
mov.8 [r2], [r1]
inc r1
inc r2
cmp.8 [r1], 0
ifz jmp convert_filename_done
mov.8 [r2], [r1]
inc r1
inc r2
cmp.8 [r1], 0
ifz jmp convert_filename_done
mov.8 [r2], [r1]
convert_filename_done:
mov r0, convert_filename_output_string
pop r31
pop r3
pop r2
pop r1
ret
convert_filename_fail:
mov r0, 0
pop r31
pop r3
pop r2
pop r1
ret
convert_filename_output_string: data.fill 0, 12
kernel + sh: Another stream overhaul Certain streams can now be opened by name by prefixing the name with a colon (':'). The only supported named stream at the moment is :fb, which streams to/from the background framebuffer. A new syscall called `get_size` was also added, which should be used instead of `ryfs_get_size`. This new syscall supports getting the size of streams.
2023-03-31 07:16:31 +02:00
; named streams
#include "vfs/fb.asm"
kernel/vfs: Add :serial named stream
2023-04-02 22:08:55 +02:00
#include "vfs/serial.asm"
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