PowerPC简介及编程

时间：03-23 来源：点击：

1.32位PowerPC结构特点

32个32位通用寄存器 ( GPRs )

寄存器支持用户级指令集 (不包括浮点指令),包括integer exception register (XER ),condition register(CR),link register(LR),counter register ( CTR )

时间加减及寄存器

管理级寄存器,与PowerPC定义兼容

Configuration-----Machine Status Register ( MSR )

Exception model-----Save/restore registers 0 and 1 (SRR0 and SRR1), DSI status register ( DSISR ), data address register ( DAR )

PowerPC 减量器

PowerPC 时基和实时时钟（RTC）

　

2.地址映射
　

名称	内存物理地址	备注
SDRAM	0x00000000~0x7FFFFFFF
PCI	0x80000000~0xEF5FFFFF
Internal Peripherals	0xEF600000~0xEFFFFFFF
UART	.....
.....	.....
External Peripherals	0xF0000000~0xFF7FFFFF
NVRAM/RTC	0xF0000000~0xF0001FFF	(8K)下画线为片选
Keybord/Mouse	0xF0100000~0xF0100001	下画线为片选
FPGA_INT_ST..	0xF0300000~0xF0300000	下画线为片选
FPGA_INT_EN..	0xF0300001~0xF0300001	下画线为片选
Socket Flash	0xFFF80000~0xFFFFFFFF	512K
SRAM	0xFFF00000~0xFFF7FFFF	512K(可通过Swich与Socket Flash 切换)

　

3.中断优先级(Exception Priority)
　

Priority	Exception Type	Cause
1	Development port	nonmaskable interrupt Signal from the development port
2	System reset	interrupt IRQ0 assertion
3	Instruction-related exceptions	Instruction processing
4	Peripheral breakpoint request or development port maskable interrupt	Breakpoint signal from any peripheral
5	External interrupt (masked if MSR[EE] = 0)	Signal from the interrupt controller
6	Decrementer interrupt(masked if MSR[EE] = 0)	Decrementer request

　

　

4.中断向量表
　

中断向量表的起始地址取决于MSR[IP]的设置

MSR[IP]=0 Exceptions are vectored to the physical address 0x000n_nnnn

MSR[IP]=1 Exceptions are vectored to the physical address 0xFFFn_nnnn

Offset	Exception	Description
0x00000	Reserved
0x00100	System reset interrupt
0x00200	Machine check interrupt
0x00300	DSI	A DSI exception is never generated by hardware, but software may branch to this location because of an data TLB error or miss exception.
0x00400	ISI	An ISI exception is never generated by the hardware, but software may branch to this location because of an implementation-speciTc instruction TLB error exception.

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