Main Processor

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Main SoC

See Kermit.

Cortex A9 MPcore

The custom SoC includes the ARM Cortex-A9 MPCore as its CPU, mounting four little-endian ARM Cortex-A9 processor cores, which is common in modern high performance embedded devices like cell phones and tablets. The PSVita cores have a MIDR value of 0x412FC09A, meaning it is Cortex-A9 r2p10. Indeed there are usage of undocumented CP15 registers.

Implemented Coprocessor registers

Register Name Used by Description
p14, #0, r0, c0, c0, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c1, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c2, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c3, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c4, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c5, #4 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c0, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c1, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c2, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c3, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c4, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c5, #5 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c0, #6 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c1, #6 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c2, #6 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c3, #6 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c0, #7 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c1, #7 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c2, #2 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c2, #7 ? SceKernelThreadMgr ?
p14, #0, r0, c0, c3, #7 ? SceKernelThreadMgr ?
p14, #6, r0, c0, c0, #0 ? SKBL/NSKBL ?
p14, #6, r0, c1, c0, #0 ? SKBL/NSKBL ?
p14, #7, r0, c1, c0, #0 ? SKBL/NSKBL ?
p15, #0, r0, c0, c0, #0 MIDR N/A Main ID Register
p15, #0, r0, c0, c0, #1 CTR N/A Cache Type Register
p15, #0, r0, c0, c0, #2 TCMTR N/A TCM Type Register
p15, #0, r0, c0, c0, #3 TLBTR N/A TLB Type Register
p15, #0, r0, c0, c0, #5 MPIDR SceSysmem/SceExcpmgr Multiprocessor Affinity Register
p15, #0, r0, c0, c0, #6 REVIDR N/A Revision ID Register
p15, #0, r0, c0, c1, #0 ID_PFR0 N/A Processor Feature Register 0
p15, #0, r0, c0, c1, #1 ID_PFR1 N/A Processor Feature Register 1
p15, #0, r0, c0, c1, #2 ID_DFR0 N/A Debug Feature Register 0
p15, #0, r0, c0, c1, #3 ID_AFR0 N/A Auxiliary Feature Register 0
p15, #0, r0, c0, c1, #4 ID_MMFR0 N/A Memory Model Feature Register 0
p15, #0, r0, c0, c1, #5 ID_MMFR1 N/A Memory Model Feature Register 1
p15, #0, r0, c0, c1, #6 ID_MMFR2 N/A Memory Model Feature Register 2
p15, #0, r0, c0, c1, #7 ID_MMFR3 N/A Memory Model Feature Register 3
p15, #0, r0, c0, c2, #0 ID_ISAR0 N/A Instruction Set Attribute Register 0
p15, #0, r0, c0, c2, #1 ID_ISAR1 N/A Instruction Set Attribute Register 1
p15, #0, r0, c0, c2, #2 ID_ISAR2 N/A Instruction Set Attribute Register 2
p15, #0, r0, c0, c2, #3 ID_ISAR3 N/A Instruction Set Attribute Register 3
p15, #0, r0, c0, c2, #4 ID_ISAR4 N/A Instruction Set Attribute Register 4
p15, #0, r0, c0, c2, #5 ID_ISAR5 N/A Instruction Set Attribute Register 5
p15, #1, r0, c0, c0, #0 CCSIDR N/A Cache Size ID Register
p15, #1, r0, c0, c0, #1 CLIDR N/A Cache Level ID Register
p15, #1, r0, c0, c0, #7 AIDR N/A Auxiliary ID Register
p15, #2, r0, c0, c0, #0 CSSELR NSKBL Cache Size Selection Register
p15, #0, r0, c1, c0, #0 SCTLR SKBL/SceDriverTzs/NSKBL/SceSysmem System Control Register
p15, #0, r0, c1, c0, #1 ACTLR N/A Auxiliary Control Register
p15, #0, r0, c1, c0, #2 CPACR SKBL Coprocessor Access Control Register
p15, #0, r0, c1, c1, #0 SCR SKBL Secure Configuration Register
p15, #0, r0, c1, c1, #1 SDER N/A Secure Debug Enable Register
p15, #0, r0, c1, c1, #2 NSACR SKBL Non-Secure Access Control Register
p15, #0, r0, c2, c0, #0 TTBR0 SKBL/SceSysmem Translation Table Base Register 0
p15, #0, r0, c2, c0, #1 TTBR1 SKBL/SceSysmem/ScePower Translation Table Base Register 1
p15, #0, r0, c2, c0, #2 TTBCR SKBL/NSKBL Translation Table Base Control Register
p15, #0, r0, c3, c0, #0 DACR SKBL/SceSysmem Domain Access Control Register
p15, #0, r0, c3, c0, #1 DACR ScePower Undocumented. Write-Only.
p15, #0, r0, c3, c0, #2 DACR ScePower Undocumented. Unknown.
p15, #0, r0, c5, c0, #0 DFSR SceExcpmgr Data Fault Status Register
p15, #0, r0, c5, c0, #1 IFSR SceExcpmgr Instruction Fault Status Register
p15, #0, r0, c5, c1, #0 ADFSR SceExcpmgr Auxiliary Data Fault Status Register
p15, #0, r0, c5, c1, #1 AIFSR SceExcpmgr Auxiliary Instruction Fault Status Register
p15, #0, r0, c6, c0, #0 DFAR SceExcpmgr Data Fault Address Register
p15, #0, r0, c6, c0, #2 IFAR SceExcpmgr Instruction Fault Address Register
p15, #0, r0, c7, c1, #0 ICIALLUIS SKBL/SceSysmem Instruction cache invalidate all PoU, IS
p15, #0, r0, c7, c1, #6 BPIALLIS SKBL/SceSysmem Branch predictor invalidate all IS
p15, #0, r0, c7, c4, #0 PAR SceSysmem Physical Address Register
p15, #0, r0, c7, c5, #0 ICIALLU SKBL/SceSysmem Instruction cache invalidate all PoU
p15, #0, r0, c7, c5, #1 ICIMVAU SceSysmem Instruction cache invalidate
p15, #0, r0, c7, c5, #6 BPIALL SceSysmem Branch predictor invalidate all
p15, #0, r0, c7, c6, #1 DCIMVAC SceSysmem Data cache invalidate by MVA PoC
p15, #0, r0, c7, c6, #2 DCISW SKBL/SceSysmem Data cache invalidate by set/way
p15, #0, r0, c7, c8, #0 ATS1CPR SceSysmem Stage 1 Current state PL1 read
p15, #0, r0, c7, c8, #1 ATS1CPW SceSysmem Stage 1 Current state PL1 write
p15, #0, r0, c7, c8, #2 ATS1CUR SceSysmem Stage 1 Current state unprivileged read
p15, #0, r0, c7, c8, #3 ATS1CUW SceSysmem Stage 1 Current state unprivileged write
p15, #0, r0, c7, c10, #1 DCCMVAC SceSysmem Data cache clean by MVA PoC
p15, #0, r0, c7, c10, #2 DCCSW SceSysmem Data cache clean by set/way
p15, #0, r0, c7, c14, #1 DCCIMVAC SceSysmem Data cache clean and invalidate by MVA PoC
p15, #0, r0, c7, c14, #2 DCCISW SceSysmem Data cache clean and invalidate by set/way
p15, #0, r0, c8, c3, #1 TLBIMVAIS SceSysmem Invalidate unified TLB by MVA IS
p15, #0, r0, c8, c3, #3 TLBIMVAAIS SceSysmem Invalidate unified TLB by MVA, all ASID IS
p15, #0, r0, c8, c7, #0 TLBIALL ScePower Invalidate entire unified TLB
p15, #0, r0, c10, c2, #0 PRRR ScePower Primary Region Remap Register
p15, #0, r0, c10, c2, #1 NMRR ScePower Normal Memory Remap Register
p15, #0, r0, c12, c0, #0 VBAR NSKBL/ScePower/SceKernelThreadMgr Vector Base Address Register
p15, #0, r0, c12, c0, #1 MVBAR SKBL Monitor Vector Base Address Register
p15, #0, r0, c12, c1, #0 ISR N/A Interrupt Status Register
p15, #0, r0, c13, c0, #0 FCSEIDR N/A FCSE Process ID Register
p15, #0, r0, c13, c0, #1 CONTEXTIDR SKBL/NSKBL/ScePower Context ID Register
p15, #0, r0, c13, c0, #2 TPIDRURW NSKBL User Read/Write Thread ID Register
p15, #0, r0, c13, c0, #3 TPIDRURO NSKBL/SceLibKernel/SceKernelThreadMgr User Read-Only Thread ID Register. Value is TLS pointer.
p15, #0, r0, c13, c0, #4 TPIDRPRW NSKBL/SceExcpmgr/SceKernelThreadMgr PL1 only Thread ID Register. Value is SceKernelThreadObject pointer.
p15, #0, r0, c15, c0, #0 PCTLR SKBL ?

Each core includes the following features:

  • L1 Instruction Cache of 32 KiB and Data Cache of 32 KiB
  • Media Processing Engine (MPE) that can execute Advanced SIMD instructions (NEONv1) and Vector Floating-Point v3 instructions (VFPv3)

In addition, there is a L2 cache of 2 MiB shared by all cores, while precisely speaking, it's external to the ARM processor core.

Documentation

A lot of useful information is available about ARM (Advanced RISC Machines) on the internet including ARM Ltd. official site.

  • Refer to the following document for the instruction set, memory model and programmers' model: ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition.
  • Cortex-A9 Technical Reference Manual

(corresponding to the chip revision supposed to be included in DevKit):

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388f/DDI0388F_cortex_a9_r2p2_trm.pdf

  • Cortex-A9 NEON Media Processing Engine Technical Reference Manual

(NEON: Advanced SIMD instructions)

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/DDI0409F_cortex_a9_neon_mpe_r2p2_trm.pdf

  • Cortex-A9 NEON MPE > VFPv3 architecture hardware support

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/CHDEEJDB.html

(The above reference destination has been confirmed as of June 26, 2014. Note that pages may have been subsequently moved or its contents modified.)

Identification registers

Register name Value
AIDR 0x00000000
CCSIDR 0x701FE019
CLIDR 0x09200003
CTR 0x83338003
ID_AFR0 0x00000000
ID_DFR0 0x00010444
ID_ISAR0 0x00101111
ID_ISAR1 0x13112111
ID_ISAR2 0x21232041
ID_ISAR3 0x11112131
ID_ISAR4 0x00011142
ID_ISAR5 0x00000000
ID_MMFR0 0x00100103
ID_MMFR1 0x20000000
ID_MMFR2 0x01230000
ID_MMFR3 0x00102111
ID_PFR0 0x00001231
ID_PFR1 0x00000011
MIDR 0x412FC09A
MPIDR 0x80000003
REVIDR 0x412FC09A
TCMTR 0x00000000
TLBTR 0x00000402

Interrupt Controller

As part of the Cortex A9 MPcore, the Vita also implements the Generic Interrupt Controller Architecture. More information on interrupts can be found here.

L2 Cache

PSVita uses the PL310 r3p1-50rel0 L2 cache (Cache ID Register = 0x410000C7) that is mapped to paddr 0x1A002000.

RO registers

Register name Value
Cache ID Register 0x410000c7
Cache Type Register 0x1e440440
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