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A resource identifier is seven bits:
three bits for the resource type
four bits for the index.
The resource encoding is given in Table 3.88.
Table 3.88. Resource encodings
Bits | Defined in ETM architecture versions | Description |
|---|---|---|
[6:4] | v1.0 | Resource type |
[3:0] | v1.0 | Resource index |
Table 3.89 defines the available resource types and shows the bit encodings used to identify them.
Table 3.89. Resource identification encoding
| Resource type (bits [6:4]) | Index range (bits [3:0]) | Description of resource type |
|---|---|---|
b000 | 0-15 | Single address comparator 1-16. |
b001 | 0-7 | Address range comparator 1-8. Represents the range between two single address comparators. |
| b001 | 8-11 | Instrumentation resource 1-4. Software-controlled resources. See Instrumentation resources, from ETMv3.3. Only available in ETMv3.3 and later. |
b010 | 0-7 | EmbeddedICE module watchpoint comparators 1-8. It is implementation defined whether an ETM supports EmbeddedICE watchpoint comparators. If it does:
|
b011 | 0-15 | Memory map decodes 1-16. |
b100 | 0-3 | Counter 1-4 at zero. |
b101 | 0-2 3-7 8-10 11 12-14 15 | Sequencer in states 1-3. Reserved. Context ID comparator 1-3, ETMv2.0 and later. VMID comparator, ETMv3.5 Reserved. Trace start/stop resource, ETMv2.0 and later. |
b110 | 0-3 4-7 8-11 12 13 14 15 | External inputs 1-4. Reserved. Extended external input selectors 1-4, ETMv3.1 and later. Reserved. Processor is in Non-secure state. Trace prohibited by processor. Hard-wired input, always true. |
| b111 | - | Reserved. |
Valid range encodings between 0 and 15 refer to resource IDs 1-16.
When a particular resource is active, this means that its output is a logical 1.
In ETMv3.5, if an invalid resource is programmed, such as one that is architecturally Reserved or a resource that is not supported by the specific implementation, the read value returned is unknown and the behavior of the event is unpredictable.
| Copyright © 1999-2002, 2004-2009, 2011 ARM Limited. All rights reserved. | ARM IHI 0014Q |
| Non-Confidential | ID101211 |
| PDF version | |
| Home > Programmers’ Model > Using ETM event resources > Resource identification |