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Check if the disk is inserted before opening a file

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Ry 2023-03-04 21:23:29 -08:00
parent bec78c9a10
commit 7a1b724707
1 changed files with 18 additions and 2 deletions
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20
ryfs.asm
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@ -19,6 +19,20 @@ ryfs_open:
push r10
push r31
; check if the requested disk id is inserted
cmp r1, 4
ifnz jmp ryfs_open_check_disk
ifz call is_romdisk_available
ifnz jmp ryfs_open_fail
cmp r1, 4
ifz jmp ryfs_open_continue
ryfs_open_check_disk:
mov r10, r1
or r10, 0x80001000
in r10, r10
cmp r10, 0
ifz jmp ryfs_open_fail
ryfs_open_continue:
; r10: pointer to file struct entry
mov r10, r2
mov.8 [r10], r1 ; write file_disk
@ -41,8 +55,7 @@ ryfs_open_find_dir_entry_loop:
add r1, 16 ; point to the file name in the next directory entry
loop ryfs_open_find_dir_entry_loop
; if we reach this point, the file wasn't found
mov r0, 0
jmp ryfs_open_end
jmp ryfs_open_fail
ryfs_open_found_dir_entry:
sub r1, 4 ; point to first sector of this file
mov.16 [r10], [r1] ; write file_first_sector
@ -57,6 +70,9 @@ ryfs_open_end:
pop r2
pop r1
ret
ryfs_open_fail:
mov r0, 0
jmp ryfs_open_end
; seek specified file to the specified offset
; inputs: