51 | | = Architecture = |
52 | | |
53 | | The publication The PowerPC Architecture: A specification for a new family of RISC processors describes the PowerPC Instruction Set Architecture has having three levels of compliance: |
54 | | |
55 | | '''UEA''' - User Instruction Set Architecture |
56 | | ``the registers, instructions, storage model, and execution model that are available to all application programs'' |
57 | | |
58 | | '''VEA''' - Virtual Environment Architecture |
59 | | ``the features of the architecture that permit application programs to create or modify code, to share data among programs in a multiprocessing system, and to optimize the performance of storage accesses'' |
60 | | |
61 | | '''OEA''' - Operating Environment Architecture |
62 | | ``the features of the architecture that permit operating systems to allocate and manage storage, to handle errors encountered by application programs, to support I/O devices, and to provide the other services expected of secure, modern, multiprocessor operating systems'' |
| 51 | |
| 75 | * Architecture |
| 76 | |
| 77 | The publication The PowerPC Architecture: A specification for a new family of RISC processors describes the PowerPC Instruction Set Architecture has having three levels of compliance: |
| 78 | |
| 79 | '''UEA''' - User Instruction Set Architecture |
| 80 | ``the registers, instructions, storage model, and execution model that are available to all application programs'' |
| 81 | |
| 82 | '''VEA''' - Virtual Environment Architecture |
| 83 | ``the features of the architecture that permit application programs to create or modify code, to share data among programs in a multiprocessing system, and to optimize the performance of storage accesses'' |
| 84 | |
| 85 | '''OEA''' - Operating Environment Architecture |
| 86 | ``the features of the architecture that permit operating systems to allocate and manage storage, to handle errors encountered by application programs, to support I/O devices, and to provide the other services expected of secure, modern, multiprocessor operating systems'' |
| 87 | |
| 88 | |
| 89 | |