A fast and easily customised operating system
for ARM devices
OS_GBPB
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_GBPB
OS_GBPB
(SWI &0C)
| Entry | |
|---|---|
| R0 | Reason code |
| Other registers dependent on reason code | |
| Exit | |
|---|---|
| R0 | Preserved |
| All other registers dependent on reason code | |
Use
The purpose of this call is to read/write a block from/to an open file.
Notes
The action performed depends on the reason code value in R0.
Reason Codes
| # | Hex # | Action |
|---|---|---|
| 1 | &01 | Write bytes to given pointer |
| 2 | &02 | Write bytes to current pointer |
| 3 | &03 | Read bytes from given pointer |
| 4 | &04 | Read bytes from current pointer |
| 5 | &05 | Read name & boot options |
| 6 | &06 | Read current dir and privilege byte |
| 7 | &07 | Read library dir and privilege byte |
| 8 | &08 | Read entries from current dir |
| 9 | &09 | Read entries from given dir |
| 10 | &0A | Read entries and info from given dir |
| 11 | &0B | Read entries and full info from given dir |
| 12 | &0C | Read entries and full info with filetype from given dir |