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Re: [Qemu-ppc] Help with assembly

From: Scott Wood
Subject: Re: [Qemu-ppc] Help with assembly
Date: Thu, 6 Dec 2012 11:51:25 -0600

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


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