ARM11协处理器简介

这是arm手册中有关协处理器的部分，因为经常忽略arm手册的作用，所以把它放在这里，给自己个提醒。

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Register allocation（摘于ARM手册）

Table 3.2 lists the allocation and reset values of the registers of the system control coprocessor where:

• CRn is the register number within CP15

• Op1 is the Opcode_1 value for the register

• CRm is the operational register

• Op2 is the Opcode_2 value for the register.

• Type applies to the Secure, S, or the Non-secure, NS, world and is:

  • B, registers banked in Secure and Non-secure worlds. If the registers are not banked then they are common to both worlds or only accessible in one world.

  • NA, no access

  • RO, read-only access

  • RO, read-only access in privileged modes only

  • R/W, read/write access

  • R/W, read/write access in privileged modes only

  • WO, write-only access

  • WO, write-only access in privileged modes only

  • X, access depends on another register or external signal.

Table 3.2. Summary of CP15 registers and operations

CRn	Op1	CRm	Op2	Register or operation	S type	NS type	Reset value	Page
c0	0	c0	0	Main ID	RO	RO	0x41xFB76x[a]	c0, Main ID Register
			1	Cache Type	RO	RO	0x10152152[b]	c0, Cache Type Register
			2	TCM Status	RO	RO	0x00020002[c]	c0, TCM Status Register
			3	TLB Type	RO	RO	0x00000800	c0, TLB Type Register
		c1	0	Processor Feature 0	RO	RO	0x00000111	c0, Processor Feature Register 0
			1	Processor Feature 1	RO	RO	0x00000011	c0, Processor Feature Register 1
			2	Debug Feature 0	RO	RO	0x00000033	c0, Debug Feature Register 0
			3	Auxiliary Feature 0	RO	RO	0x00000000	c0, Auxiliary Feature Register 0
			4	Memory Model Feature 0	RO	RO	0x01130003	c0, Memory Model Feature Register 0
			5	Memory Model Feature 1	RO	RO	0x10030302	c0, Memory Model Feature Register 1
			6	Memory Model Feature 2	RO	RO	0x01222100	c0, Memory Model Feature Register 2
			7	Memory Model Feature 3	RO	RO	0x00000000	c0, Memory Model Feature Register 3
		c2	0	Instruction Set Feature Attribute 0	RO	RO	0x00140011	c0, Instruction Set Attributes Register 0
			1	Instruction Set Feature Attribute 1	RO	RO	0x12002111	c0, Instruction Set Attributes Register 1
			2	Instruction Set Feature Attribute 2	RO	RO	0x11231121	c0, Instruction Set Attributes Register 2
			3	Instruction Set Feature Attribute 3	RO	RO	0x01102131	c0, Instruction Set Attributes Register 3
			4	Instruction Set Feature Attribute 4	RO	RO	0x00001141	c0, Instruction Set Attributes Register 4
			5	Instruction Set Feature Attribute 5	RO	RO	0x00000000	c0, Instruction Set Attributes Register 5
			6-7	Reserved	-	-	-	-
		c3-c7	-	Reserved	-	-	-	-
c1	0	c0	0	Control	R/W, B[d], X	R/W	0x00050078[e]	c1, Control Register
			1	Auxiliary Control	R/W	RO	0x00000007	c1, Auxiliary Control Register
			2	Coprocessor Access Control	R/W	R/W	0x00000000	c1, Coprocessor Access Control Register
		c1	0	Secure Configuration	R/W	NA	0x00000000	c1, Secure Configuration Register
			1	Secure Debug Enable	R/W	NA	0x00000000	c1, Secure Debug Enable Register
			2	Non-Secure Access Control	R/W	RO	0x00000000	c1, Non-Secure Access Control Register
c2	0	c0	0	Translation Table Base 0	R/W, B, X	R/W	0x00000000	c2, Translation Table Base Register 0
			1	Translation Table Base 1	R/W, B	R/W	0x00000000	c2, Translation Table Base Register 1
			2	Translation Table Base Control	R/W, B, X	R/W	0x00000000	c2, Translation Table Base Control Register
c3	0	c0	0	Domain Access Control	R/W, B, X	R/W	0x00000000	c3, Domain Access Control Register
c4				Not used
c5	0	c0	0	Data Fault Status	R/W, B	R/W	0x00000000	c5, Data Fault Status Register
			1	Instruction Fault Status	R/W, B	R/W	0x00000000	c5, Instruction Fault Status Register
c6	0	c0	0	Fault Address	R/W, B	R/W	0x00000000	c6, Fault Address Register
			1	Watchpoint Fault Address	R/W	NA	0x00000000	c6, Watchpoint Fault Address Register
			2	Instruction Fault Address	R/W, B	R/W	0x00000000	c6, Instruction Fault Address Register
c7	0	c0	4	Wait For Interrupt	WO	WO	-	Wait For Interrupt operation
		c4	0	PA	R/W, B	R/W	0x00000000	PA Register
		c5	0	Invalidate Entire Instruction Cache	WO	WO, X	-	Invalidate, Clean, and Prefetch operations
			1	Invalidate Instruction Cache Line by MVA	WO	WO	-	Invalidate, Clean, and Prefetch operations
			2	Invalidate Instruction Cache Line by Index	WO	WO	-	Invalidate, Clean, and Prefetch operations
			4	Flush Prefetch Buffer	WO	WO	-	Flush operations
			6	Flush Entire Branch Target Cache	WO	WO	-	Flush operations
			7	Flush Branch Target Cache Entry by MVA	WO	WO	-	Flush operations
		c6	0	Invalidate Entire Data Cache	WO	NA	-	Invalidate, Clean, and Prefetch operations
			1	Invalidate Data Cache Line by MVA	WO	WO	-	Invalidate, Clean, and Prefetch operations
			2	Invalidate Data Cache Line by Index	WO	WO	-	Invalidate, Clean, and Prefetch operations
		c7	0	Invalidate Both Caches	WO	NA	-	Invalidate, Clean, and Prefetch operations
		c8	0-3	VA to PA translation in the current world	WO	WO	-	VA to PA translation in the current world
			4-7	VA to PA translation in the other world	WO	NA	-	VA to PA translation in the other world
c7	0	c10	0	Clean Entire Data Cache	WO, X	WO, X	-	Invalidate, Clean, and Prefetch operations
			1	Clean Data Cache Line by MVA	WO	WO	-	Invalidate, Clean, and Prefetch operations
			2	Clean Data Cache Line by Index	WO	WO	-	Invalidate, Clean, and Prefetch operations
			4	Data Synchronization Barrier	WO	WO	-	Data Synchronization Barrier operation
			5	Data Memory Barrier	WO	WO	-	Data Memory Barrier operation
			6	Cache Dirty Status	RO, B	RO	0x00000000	Cache Dirty Status Register
		c13	1	Prefetch Instruction Cache Line	WO	WO	-	Invalidate, Clean, and Prefetch operations
		c14	0	Clean and Invalidate Entire Data Cache	WO, X	WO, X	-	Invalidate, Clean, and Prefetch operations
			1	Clean and Invalidate Data Cache Line by MVA	WO	WO	-	Invalidate, Clean, and Prefetch operations
			2	Clean and Invalidate Data Cache Line by Index	WO	WO	-	Invalidate, Clean, and Prefetch operations
c8	0	c5	0	Invalidate Instruction TLB unlocked entries	WO, B	WO	-	c8, TLB Operations Register
			1	Invalidate Instruction TLB entry by MVA	WO, B	WO	-	c8, TLB Operations Register
			2	Invalidate Instruction TLB entry on ASID match	WO, B	WO	-	c8, TLB Operations Register
c8	0	c6	0	Invalidate Data TLB unlocked entries	WO, B	WO	-	c8, TLB Operations Register
			1	Invalidate Data TLB entry by MVA	WO, B	WO	-	c8, TLB Operations Register
			2	Invalidate Data TLB entry on ASID match	WO, B	WO	-	c8, TLB Operations Register
		c7	0	Invalidate unified TLB unlocked entries	WO, B	WO	-	c8, TLB Operations Register
			1	Invalidate unified TLB entry by MVA	WO, B	WO	-	c8, TLB Operations Register
			2	Invalidate unified TLB entry on ASID match	WO, B	WO	-	c8, TLB Operations Register
c9	0	c0	0	Data Cache Lockdown	R/W	R/W, X	0xFFFFFFF0	c9, Data and instruction cache lockdown registers
			1	Instruction Cache Lockdown	R/W	R/W, X	0xFFFFFFF0	c9, Data and instruction cache lockdown registers
		c1	0	Data TCM Region	R/W, X	R/W, X	0x00000014[f]	c9, Data TCM Region Register
			1	Instruction TCM Region	R/W, X	R/W, X	0x00000014[g]	c9, Instruction TCM Region Register
			2	Data TCM Non-secure Control Access	R/W, X	NA	0x00000000	c9, Data TCM Non-secure Control Access Register
			3	Instruction TCM Non-secure Control Access	R/W, X	NA	0x00000000	c9, Instruction TCM Non-secure Control Access Register
		c2	0	TCM Selection	R/W, B	R/W	0x00000000	c9, TCM Selection Register
		c8	0	Cache Behavior Override	R/W[h]	R/W	0x00000000	c9, Cache Behavior Override Register
c10	0	c0	0	TLB Lockdown	R/W, X	R/W, X	0x00000000	c10, TLB Lockdown Register
		c2	0	Primary Region Memory Remap Register	R/W, B, X	R/W	0x00098AA4	c10, Memory region remap registers
			1	Normal Memory Region Remap Register	R/W, B, X	R/W	0x44E048E0	c10, Memory region remap registers
c11	0	c0	0-3	DMA identification and status	RO	RO, X	0x0000000B[i]	c11, DMA identification and status registers
		c1	0	DMA User Accessibility	R/W	R/W, X	0x00000000	c11, DMA User Accessibility Register
		c2	0	DMA Channel Number	R/W, X	R/W, X	0x00000000	c11, DMA Channel Number Register
		c3	0-2	DMA enable	WO, X	WO, X	-	c11, DMA enable registers
		c4	0	DMA Control	R/W, X	R/W, X	0x08000000	c11, DMA Control Register
		c5	0	DMA Internal Start Address	R/W, X	R/W, X	-	c11, DMA Internal Start Address Register
		c6	0	DMA External Start Address	R/W, X	R/W, X	-	c11, DMA External Start Address Register
		c7	0	DMA Internal End Address	R/W, X	R/W, X	-	c11, DMA Internal End Address Register
		c8	0	DMA Channel Status	RO, X	RO, X	0x00000000	c11, DMA Channel Status Register
		c15	0	DMA Context ID	R/W	R/W, X	-	c11, DMA Context ID Register
c12	0	c0	0	Secure or Non-secure Vector Base Address	R/W, B, X	R/W	0x00000000	c12, Secure or Non-secure Vector Base Address Register
			1	Monitor Vector Base Address	R/W, X	NA	0x00000000	c12, Monitor Vector Base Address Register
		c1	0	Interrupt Status	RO	RO	0x00000000[j]	c12, Interrupt Status Register
c13	0	c0	0	FCSE PID	R/W, B, X	R/W	0x00000000	c13, FCSE PID Register
			1	Context ID	R/W, B	R/W	0x00000000	c13, Context ID Register
			2	User Read/Write Thread and Process ID	R/W, B	R/W	0x00000000	c13, Thread and process ID registers
			3	User Read-only Thread and Process ID	R/W,RO, B[k]	R/W,RO	0x00000000	c13, Thread and process ID registers
			4	Privileged Only Thread and Process ID	R/W, B	R/W	0x00000000	c13, Thread and process ID registers
c14				Not used
c15	0	c2	4	Peripheral Port Memory Remap	R/W, B, X	R/W	0x00000000	c15, Peripheral Port Memory Remap Register
		c9	0	Secure User and Non-secure Access Validation Control	R/W, X	NA	0x00000000	c15, Secure User and Non-secure Access Validation Control Register
		c12	0	Performance Monitor Control	R/W, X	R/W, X	0x00000000	c15, Performance Monitor Control Register
			1	Cycle Counter	R/W, X	R/W, X	0x00000000	c15, Cycle Counter Register
			2	Count 0	R/W, X	R/W, X	0x00000000	c15, Count Register 0
			3	Count 1	R/W, X	R/W, X	0x00000000	c15, Count Register 1
			4-7	System Validation Counter	R/W, X	R/W, X	0x00000000	c15, System Validation Counter Register
		c13	1-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
		c14	0	System Validation Cache Size Mask	R/W, X	R/W, X	0x00006655[l]	c15, System Validation Cache Size Mask Register
c15	1	c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	2	c13	1-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	3	c8	0-7	Instruction Cache Master Valid	R/W, X	NA	0x00000000	c15, Instruction Cache Master Valid Register
		c12	0-7	Data Cache Master Valid	R/W, X	NA	0x00000000	c15, Data Cache Master Valid Register
		c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	4	c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	5	c4	2	TLB Lockdown Index	R/W, X	NA	0x00000000	c15, TLB lockdown access registers
		c5	2	TLB Lockdown VA	R/W, X	NA	-	c15, TLB lockdown access registers
		c6	2	TLB Lockdown PA	R/W, X	NA	-	c15, TLB lockdown access registers
		c7	2	TLB Lockdown Attributes	R/W, X	NA	-	c15, TLB lockdown access registers
		c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	6	c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
c15	7	c13	0-7	System Validation Operations	R/W, X	R/W, X	0x00000000	c15, System Validation Operations Register
[a] See c0, Main ID Register for the values of bits [23:20] and bits [3:0]. [b] Reset value depends on the cache size implemented. The value here is for 16KB instruction and data caches. [c] Reset value depends on the number of TCM banks implemented. The value here is for 2 data TCM and 2 instruction TCM banks. [d] Some bits in this register are banked and some Secure modify only. [e] Reset value depends on external signals. [f] Reset value depends on the TCM sizes implemented. The value here is for 16KB TCM banks. [g] Reset value depends on the TCM sizes implemented, and on the value of the INITRAM static configuration signal. The value here is for 16KB TCM banks, with INITRAM tied LOW. [h] Some bits in this register are common and some Secure modify only. [i] Reset value depends on the number of DMA channels implemented and the presence of TCMs. [j] Reset value depends on external signals. [k] This register is read/write in Privileged modes and read-only on User mode. [l] Reset value depends on the cache and TCM sizes implemented. The value here is for 2 banks of 16KB instruction and data TCMs and 16KB instruction and data caches.

Table 3.3 lists the operations available with MCRR operations:

MCRR{cond} P15,<Opcode_1>,<End Address>,<Start Address>,<CRm>

Table 3.3. Summary of CP15 MCRR operations

Op1	CRm	Register or operation	S type	NS type	Reset value	Page
0	c5	Invalidate instruction cache range	WO	WO	-	c7, Cache operations
	c6	Invalidate data cache range	WO	WO	-	c7, Cache operations
	c12	Clean data cache range	WO	WO	-	c7, Cache operations
	c14	Clean and invalidate data cache range	WO	WO	-	c7, Cache operations

Table 3.3 lists the operations available with MCRR operations:

MCRR{cond} P15,<Opcode_1>,<End Address>,<Start Address>,<CRm>

Table 3.3. Summary of CP15 MCRR operations

Op1	CRm	Register or operation	S type	NS type	Reset value	Page
0	c5	Invalidate instruction cache range	WO	WO	-	c7, Cache operations
	c6	Invalidate data cache range	WO	WO	-	c7, Cache operations
	c12	Clean data cache range	WO	WO	-	c7, Cache operations
	c14	Clean and invalidate data cache range	WO	WO	-	c7, Cache operations

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Use of the system control coprocessor

This section describes the general method for use of the system control coprocessor.

You can access system control coprocessor CP15 registers with MRC and MCR instructions.

MCR{cond} P15,<Opcode_1>,<Rd>,<CRn>,<CRm>,<Opcode_2>

MRC{cond} P15,<Opcode_1>,<Rd>,<CRn>,<CRm>,<Opcode_2>

Figure 3.9 shows the instruction bit pattern of MRC and MCR instructions.

Figure 3.9. CP15 MRC and MCR bit pattern

The CRn field of MRC and MCR instructions specifies the coprocessor register to access. The CRm field and Opcode_2 fields specify a particular operation when addressing registers. The L bit distinguishes between an MRC (L=1) and an MCR (L=0).

Instructions CDP, LDC, and STC, together with unprivileged MRC and MCR instructions to privileged-only CP15 registers, and Non-secure accesses to Secure registers, cause the processor to take the Undefined instruction trap.

Note

Attempting to read from a nonreadable register, or to write to a nonwriteable register causes Undefined exceptions.

The Opcode_1, Opcode_2, and CRm fields Should Be Zero in all instructions that access CP15, except when the values specified are used to select required operations. Using other values results in Undefined exceptions.

In all cases, reading from or writing any data values to any CP15 registers, including those fields specified as Unpredictable(UNP), Should Be One (SBO), or Should Be Zero (SBZ), does not cause any physical damage to the chip.