Re: [Qemu-ppc] Help with assembly

[Scott Wood]

On 11/27/2012 10:35:44 PM, Programmingkid wrote:
> I'm trying to make a procedure that would make QEMU reduce the amount  
> of CPU time it uses. Using the information from here:  
> https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/852569B20050FF7785256996006C28E2/$file/7xx_um.pdf,  
> I tried to make a program that would cause the PowerPC 750 to enter  
> DOZE mode. I think this mode is what I need to do to make QEMU more  
> energy efficient. So far my attempts to make QEMU use less than 100%  
> of the CPU time haven't worked. Any one have a clue what I'm doing  
> wrong?
>
> mfspr r11, 1008         ; copy HID0 into r11
> ori r11, r11,  0x0100   ; set doze bit   0000 0001 0000 0000  = 0x0100
> andi. r11, r11,  0xF9FF  	; 1111 1001 1111 1111 = 0xF9FF    
> disable nap and sleep bits
> mtspr 1008, r11         ; copy r11 back into HID0
> mfmsr r11                       ; copy MSR into r11
> ori r11, r11, 0x200		; set MSR[POW] bit	  0010 0000  
> 0000 0000 = 0x2000

POW is 0x40000, not 0x2000

> oris r11, r11, 1                ; set MSR[EE] bit       

EE is 0x8000, not 0x10000

-Scott