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an mftb mnemonic with one operand as the simplified form. Implementation Note—In the e600 core, note the following: • The e600 core allows user-mode read access to the time base counter through the use of the Move from Time Base (mftb) instruction. As a 32-bit implementation of the PowerPC architecture, the.
PowerPC includes a "time base" register which is incremented regularly (although perhaps not at each clock -- it depends on the actual hardware and the operating system). The TB register is a 64-bit value, read as two 32-bit halves with mftb (low half) and mftbu (high half). The four least significant bits of
instructions only. Note that the handling of reserved bits in any register is implementation-dependent. Software is permitted to write any value to a reserved bit in a mftb. rD. The above example uses the simplified mnemonic (referred to as extended mnemonic in the architecture specification) form of the mftb instruction
7 Jan 2009 Describes the syntax, directives, and specific options required for the OS X assembler.
Note that these descriptions are taken from the 64-bit version of the instruction set; bit numbering are different for some instructions on 32-bit implementations. The lab course software uses a 32-bit PowerPC emulator. The mnemonics column shows all valid from Special-Purpose Register. mftb, mftb, Move from Time Base.
15 Jul 2015 _CPU_Counter_read(), called e.g., when RTEMS profiling is enabled, attempts to use the mftb instruction to access the time base. This instruction does not exist on Book E processors (such as the e500 used in the MVME3100) and causes an exception on those architectures. At least RTEMS profiling
I'm trying to port some benchmark code from a 440 core processor to the MPC5675K. On the 440, I can access the time base register with the "mftb" and "mftbu" inline assembly commands, but Code Warrior will cry on the 5675K: Instruction "MFTB" can not be translated from Classic PPC to VLE PPC.
The instructions that have been added to PowerPC®, but are not in the POWER® family.
Book III, PowerPC. Operating Environment Architecture defines the system (privileged) instructions and related facilities. Book IV, PowerPC Implementation II mftb. Move From Time Base. X. 31. 373. 36 lwaux. Load Word Algebraic with Update Indexed. X. 31. 375. 34 lhaux. Load Halfword Algebraic with Update Indexed.

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March 2018