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ac6 >> ac6-formation >> Processeurs PowerPC >> NXP Power CPUs >> e500mc implementation Télécharger le catalogue Télécharger la page Ecrivez nous Version imprimable

FCC1 e500mc implementation

This course covers the e500mc core present in 32-bit QorIQ SoCs

formateur
Objectives
  • This course provides a detailed description of the e500mc internal architecture as well as the associated low level routines.
  • Coherency mechanisms required in multiple e500mc platforms are explained through sequences.
  • All mechanisms required in a multiple core system are described: atomic sequence through lwarx/stwxc. instruction pair, doorbell interrupts.
  • The course focuses on the benefits of the hypervisor: running several operating systems, partitioning, load balancing and virtualization.
  • The operation of the MMU is studied, particularly the TLB software reload routines.
  • The course details the interrupt proxy unit and provides guidelines to implement nesting.
  • Note that for on-site course, the contents can be tailored to specific customer needs.

  • This course has been designed in collaboration with NXP
A more detailed course description is available on request at formation@ac6-formation.com
Prerequisites
  • Experience of a 32-bit processor or DSP is mandatory.
Exercise :  The environment used to build and debug software labs are based on the GNU compiler / linker and the debugger from Lauterbach.

CORE ARCHITECTURE
  • Block diagram
  • CoreNet interface
  • Highlighting differences between e500 and e500mc
HYPERVISOR
  • Privilege levels: user, guest supervisor, hypervisor
  • Logical partition
  • Hypervisor call instruction
  • Bare-metal operation
PIPELINE
  • e500mc pipeline implementation
  • Issue queue resource requirements
  • Execution model
  • Branch management: dynamic prediction
  • Guarded memory
INTERNAL DATA / INSTRUCTION PATHS
  • L1 and L2 cache loading, hit under miss, miss under miss
  • The load miss queue
  • The store miss merging mechanism
  • Clarifying the difference between msync and lwsync
e500mc USER LEVEL PROGRAMMING
  • Implementing atomic sequences in multiple core systems, mdors instruction
  • Decorated load and store instructions
  • Integer arithmetic and logic instructions
  • FPU operation : FPSCR register, IEEE vs non-IEEE mode
  • Float load / store instructions
  • Float arithmetic instructions
  • Convert instructions
  • The EABI
SUPERVISOR / HYPERVISOR LEVEL PROGRAMMING
  • Accessing special registers, understanding the required synchronizations
  • Implementing low power modes, wait instruction
  • Core timers
THE EXCEPTION MECHANISM
  • Exception management: building the handler table through IVPR,IVOR registers
  • Finding the exact exception cause through syndrome registers
  • New machine check features
  • Interrupt proxy
  • Doorbell interrupts
THE MEMORY MANAGEMENT UNIT
  • 4 GB effective address space, 64 GB real address space
  • Address translation, understanding the interim 48-bit virtual address
  • WIMGE attributes
  • Two-level MMU architecture
  • Software TLB reload
  • Managing a page descriptor table in a SMP system
  • Virtualization fault
  • External PID load and store instructions
L1 AND L2 CACHES, SNOOPING
  • Cache basics
  • L1 data cache flush
  • L2 cache organization
  • Cache coherency basics
  • The MESI L1 data line states
  • MESI snooping sequences involving two e500mc and a PCI Express master
  • Cache-to-cache transactions
  • Cache related instructions
  • Cache entry locking
  • Stashing capability
  • L1 and L2 error checking and correction, L2 cache error injection
  • Write shadow mode
DEBUG
  • Performance monitor
  • Nexus debug unit
  • Instruction and data breakpoints
  • Debug data acquisition message