Implement very basic RYFS write support; cannot write past end of files
Bumps version to 0.7.0
This commit is contained in:
Ry
parent
b96e6979ca
commit
155eed220c
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@ -77,6 +77,7 @@ ryfs_read_whole_file: jmp [0xF0045014]
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ryfs_get_size: jmp [0xF0045018]
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ryfs_get_file_list: jmp [0xF004501C]
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ryfs_tell: jmp [0xF0045020]
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ryfs_write: jmp [0xF0045024]
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; memory copy/compare jump table
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copy_memory_bytes: jmp [0xF0046000]
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3
main.asm
3
main.asm
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@ -3,7 +3,7 @@
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org 0xF0000000
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const FOX32ROM_VERSION_MAJOR: 0
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const FOX32ROM_VERSION_MINOR: 6
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const FOX32ROM_VERSION_MINOR: 7
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const FOX32ROM_VERSION_PATCH: 0
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const SYSTEM_STACK: 0x01FFF800
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@ -285,6 +285,7 @@ get_rom_version:
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data.32 ryfs_get_size
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data.32 ryfs_get_file_list
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data.32 ryfs_tell
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data.32 ryfs_write
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; memory copy/compare jump table
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org.pad 0xF0046000
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166
ryfs.asm
166
ryfs.asm
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@ -258,6 +258,172 @@ ryfs_read_whole_file:
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pop r0
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ret
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; write specified number of bytes from the specified buffer
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; THIS DOES NOT UPDATE THE TOTAL SIZE OF THE FILE; do not write past the end of a file, bad things will happen
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; inputs:
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; r0: number of bytes to write
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; r1: pointer to file struct
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; r2: pointer to source buffer
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; outputs:
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; none
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ryfs_write:
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push r0
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push r1
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push r2
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push r3
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push r4
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push r5
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push r10
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push r11
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push r12
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push r31
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; number_of_sectors_to_load = ceil(input r0, 506) / 506
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; first, ceil the number of bytes to multiple of 506
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; value_temp = value / 506
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; if value % 506 != 0:
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; value_temp++
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; value_ceil = value_temp * 506
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mov r10, r0
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mov r11, r0
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mov r12, 506
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div r11, r12
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rem r10, r12
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ifnz inc r11
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mul r11, r12
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div r11, r12
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mov r3, r11 ; r3: number_of_sectors_to_load
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mov r10, r1
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add r10, 3
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mov r4, [r10]
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mov r10, r4
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mov r11, r4
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mov r12, 506
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div r11, r12
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rem r10, r12
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ifnz inc r11
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mul r11, r12
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div r11, r12
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mov r4, r11 ; r4: number of sectors to traverse
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; start_sector = traverse through linked sectors starting at file_struct.file_first_sector
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push r0
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push r1
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push r2
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mov r10, r1
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; read the file's first sector into the temp buffer
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movz.8 r1, [r10] ; file_disk
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inc r10
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movz.16 r0, [r10] ; file_first_sector
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mov r31, r4
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ryfs_write_traverse_sectors_loop:
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mov r2, TEMP_SECTOR_BUF
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call read_sector
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mov r4, r0
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add r2, 2 ; point to next sector number
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movz.16 r0, [r2] ; load next sector number
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cmp r31, 0 ; if we started at zero, then don't attempt to loop
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ifnz loop ryfs_write_traverse_sectors_loop
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pop r2
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pop r1
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pop r0
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; r4: start_sector
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; total_bytes_remaining = input r0
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; this_sector = start_sector
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; for range 0..number_of_sectors_to_load:
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; load this_sector into temporary buffer
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; bytes_to_load = if total_bytes_remaining >= 506
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; 506
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; else:
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; total_bytes_remaining
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; for range 0..bytes_to_load:
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; load byte from temporary buffer into destination buffer
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; this_sector = this_sector.next
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mov r10, r0 ; r10: total_bytes_remaining
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ryfs_write_sector_loop:
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push r0
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push r1
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push r2
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; read this sector into the temp buffer
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mov r0, r4
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movz.8 r1, [r1] ; file_disk
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mov r2, TEMP_SECTOR_BUF
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call read_sector
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pop r2
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pop r1
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pop r0
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; r11: bytes_to_load
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cmp r10, 506
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ifgteq mov r11, 506
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iflt mov r11, r10
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push r0
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push r1
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push r2
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; calculate the seek offset
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mov r12, r1
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add r12, 3
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mov r5, [r12]
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rem r5, 506
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; copy the sector data from the source buffer to the temp buffer
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mov r0, r2
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mov r1, TEMP_SECTOR_BUF
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add r1, 6
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add r1, r5 ; add the seek offset
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mov r2, r11
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call copy_memory_bytes
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pop r2
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pop r1
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pop r0
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push r0
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push r1
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push r2
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; write this sector back out to disk
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mov r0, r4
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movz.8 r1, [r1] ; file_disk
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mov r2, TEMP_SECTOR_BUF
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call write_sector
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pop r2
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pop r1
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pop r0
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; this_sector = this_sector.next
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mov r5, TEMP_SECTOR_BUF
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add r5, 2
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movz.16 r5, [r5]
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mov r4, r5
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add r2, r11
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sub r10, r11
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ifnz jmp ryfs_write_sector_loop
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; file_struct.file_seek_offset += input r0
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add r1, 3
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add [r1], r0
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pop r31
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pop r12
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pop r11
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pop r10
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pop r5
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pop r4
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pop r3
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pop r2
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pop r1
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pop r0
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ret
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; get the exact size of a file
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; inputs:
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; r0: pointer to file struct
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