ARM GIC-400 寄存器

1.简介

GIC-400是用于控制中断的。在cubieboard2 上 的A20芯片采用了这款控制器。

cubieboard2 的GIC控制器 的地址是0x01C80000---0x01C87FFF ,长度等于GIC-400寄存器的长度。

具体的内容如下所示。

以0x01C80000为起始地址,下面给出的是偏移:

0x0000-0x0FFF

Reserved 未使用,无用

0x1000-0x1FFF

Distributor 配置器 有用

0x2000-0x3FFF

CPU interfaces CPU接口 有用

0x4000-0x4FFF

Virtual interface control block, for the processor that is performing the access

虚拟化相关,无用

0x5000-0x5FFF

Virtual interface control block, for the processor selected by address bits [11:9]

虚拟化相关,无用

 

0x5000-0x51FF

0x5200-0x53FF

...

0x5E00-0x5FFF

Alias for Processor 0 

Alias for Processor 1

...

Alias for Processor 7

0x6000-0x7FFF

Virtual CPU interfaces

虚拟化相关,无用

常用的是图中第二块和第三块,0x1000~0x3fff这部分的配置。

2.Distributor 配置器

distributor这块寄存器的地址 = GIC控制器 的地址 + 0x1000 ,使用的时候别忘记了偏移。然后从这里开始,有如下的寄存器

偏移

名称

可读写

复位后

作用

0x000

GICD_CTLR

RW

0x00000000[c]

Distributor Control Register

写入1使能控制器,必备

0x004

GICD_TYPER

RO

Configuration-dependent[d]

Interrupt Controller Type Register

其中可以查看中断线的总数

0x008

GICD_IIDR

RO

0x0200143B

Distributor Implementer Identification Register, GICD_IIDR

存了一些版本信息,没用

0x080-0x0BC

GICD_IGROUPRn

RW

0x00000000

Interrupt Group Registers[e]

一个位图,控制中断属于A组还是B组

0x100

GICD_ISENABLERn

RW[f]

SGIs and PPIs:0x0000FFFF[g]

Interrupt Set-Enable Registers

一个位图,用于使能各个中断,写入1使能。有用

0x104-0x13C

SPIs: 0x00000000

0x180

GICD_ICENABLERn

RW[f]

0x0000FFFF[g]

Interrupt Clear-Enable Registers

和上一个寄存器类似,作用相反,写入1禁止。

0x184-0x1BC

0x00000000

0x200-0x23C

GICD_ISPENDRn

RW

0x00000000

Interrupt Set-Pending Registers

pend位图,写入1可以进入pend状态

0x280-0x2BC

GICD_ICPENDRn

RW

0x00000000

Interrupt Clear-Pending Registers

同上,写入1效果相反,阻止pend状态

0x300-0x33C

GICD_ISACTIVERn

RW

0x00000000

Interrupt Set-Active Registers

位图,写入1可以激活中断

0x380-0x3BC

GICD_ICACTIVERn

RW

0x00000000

Interrupt Clear-Active Registers

写入1反激活中断

0x400-0x5FC

GICD_IPRIORITYRn

RW

0x00000000

Interrupt Priority Registers

存着各个中断的优先级,每8位算一个

0x800-0x81C

GICD_ITARGETSRn

RO[h]

-

Interrupt Processor Targets Registers[i]

某个中断应该发往哪个处理器进行处理

0x820-0x9FC

RW

0x00000000

0xC00

GICD_ICFGRn

RO

SGIs: 0xAAAAAAAA

Interrupt Configuration Registers, GICD_ICFGRn

配置中断是低电平触发还是下降沿触发

0xC04

RO

PPIs: 0x55540000

0xC08-0xC7C

RW[j]

SPIs: 0x55555555

0xD00

GICD_PPISR

RO

0x00000000

Private Peripheral Interrupt Status Register, GICD_PPISR

一般没用

0xD04-0xD3C

GICD_SPISRn

RO

0x00000000

Shared Peripheral Interrupt Status Registers, GICD_SPISRn

没用

0xF00

GICD_SGIR

WO

-

Software Generated Interrupt Register

控制软中断

0xF10-0xF1C

GICD_CPENDSGIRn

RW

0x00000000

SGI Clear-Pending Registers

软中断的pend位

0xF20-0xF2C

GICD_SPENDSGIRn

RW

0x00000000

SGI Set-Pending Registers

同上,不过写入1时停止pend

0xFD0

GICD_PIDR4

RO

0x00000004

Peripheral ID 4 Register

0xFD4

GICD_PIDR5

RO

0x00000000

Peripheral ID 5 Register

0xFD8

GICD_PIDR6

RO

0x00000000

Peripheral ID 6 Register

0xFDC

GICD_PIDR7

RO

0x00000000

Peripheral ID 7 Register

0xFE0

GICD_PIDR0

RO

0x00000090

Peripheral ID 0 Register

0xFE4

GICD_PIDR1

RO

0x000000B4

Peripheral ID 1 Register

0xFE8

GICD_PIDR2

RO

0x0000002B

Peripheral ID 2 Register

0xFEC

GICD_PIDR3

RO

0x00000000

Peripheral ID 3 Register

0xFF0

GICD_CIDR0

RO

0x0000000D

Component ID 0 Register

0xFF4

GICD_CIDR1

RO

0x000000F0

Component ID 1 Register

0xFF8

GICD_CIDR2

RO

0x00000005

Component ID 2 Register

0xFFC

GICD_CIDR3

RO

0x000000B1

Component ID 3 Register

 

3.cpu接口

开始地址的偏移量为0x2000

Offset

Name

Type

Reset

Description[a]

0x0000

GICC_CTLR

RW

0x00000000

CPU Interface Control Register 

使能位。写入1使能

0x0004

GICC_PMR

RW

0x00000000

Interrupt Priority Mask Register

限制中断最低优先级,高于此值无法中断,最好写大一点

0x0008

GICC_BPR

RW

0x00000002[b]

Binary Point Register

The minimum value of the Binary Point Register depends on which security-banked copy is considered:

0x2

Secure copy

0x3

Non-secure copy

优先级分组

0x000C

GICC_IAR

RO

0x000003FF

Interrupt Acknowledge Register

只读,中断id

0x0010

GICC_EOIR

WO

-

End of Interrupt Register

写入以告知cpu已经处理完中断

0x0014

GICC_RPR

RO

0x000000FF

Running Priority Register

当前中断优先级

0x0018

GICC_HPPIR

RO

0x000003FF

Highest Priority Pending Interrupt Register [c]

最高优先级中断号及其pend值

0x001C

GICC_ABPR

RW

0x00000003

Aliased Binary Point Register[d]

The minimum value of the Aliased Binary Point Register is 0x3.

别名寄存器

0x0020

GICC_AIAR

RO

0x000003FF

Aliased Interrupt Acknowledge Register[d]

别名寄存器

0x0024

GICC_AEOIR

WO

-

Aliased End of Interrupt Register[d]

别名寄存器

0x0028

GICC_AHPPIR

RO

0x000003FF

Aliased Highest Priority Pending Interrupt Register[c][d]

别名寄存器

0x00D0

GICC_APR0

RW

0x00000000

Active Priority Register

用于保存和恢复

0x00E0

GICC_NSAPR0

RW

0x00000000

Non-Secure Active Priority Register[d]

用于保存和恢复

0x00FC

GICC_IIDR

RO

0x0202143B

CPU Interface Identification Register, GICC_IIDR

存着版本信息

0x1000

GICC_DIR

WO

-

Deactivate Interrupt Register

posted @ 2016-06-30 20:00  linanwx  阅读(4681)  评论(0编辑  收藏  举报