A fast and easily customised operating system
for ARM devices
OS_Memory
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Memory
OS_Memory
(SWI &68)
| Entry | |
|---|---|
| R0 | Reason code (bits 0 -7), |
| Flags (bits 8 – 31) which are reason code specific | |
| All other registers are dependent on reason code | |
| Exit | |
|---|---|
| R0 | Preserved |
| All other registers dependent on reason code | |
Use
The purpose of this call is to perform various operations for memory management.
Notes
The action performed depends on the reason code value in R0.
The flags (passed by R0 on entry) are specific to each reason code.
Reason Codes
| # | Hex # | Action |
|---|---|---|
| 0 | &00 | General page block operations |
| 1 | &01 | Reserved for system use |
| 2 | &02 | Reserved for system use |
| 3 | &03 | Reserved for system use |
| 4 | &04 | Reserved for system use |
| 5 | &05 | Reserved for system use |
| 6 | &06 | Read the size of the physical memory arrangement table |
| 7 | &07 | Read the physical memory arrangement table |
| 8 | &08 | Read the amount of a specified sort of memory available |
| 9 | &09 | Read controller presence and base logical address |
| 10 | &0A | Free pool lock |
| 11 | &0B | Reserved for system use |
| 12 | &0C | Recommend page |
| 13 | &0D | Map in IO permanent |
| 14 | &0E | Map in IO temporary |
| 15 | &0F | Map out temporary IO |
| 16 | &10 | Memory areas |
| 24 | &18 | Check memory access |
| 25 | &19 | Read controller presence and base physical address |