[Qemu-devel] qemu vnc.c

[Qemu-devel] qemu vnc.c

[Fabrice Bellard]

CVSROOT:	/sources/qemu
Module name:	qemu
Changes by:	Fabrice Bellard <bellard>	06/08/24 20:36:44

Modified files:
	.              : vnc.c 

Log message:
	signed fixes - VNC console switch (initial patch by Andrzej Zaborowski)

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/qemu/vnc.c?cvsroot=qemu&r1=1.7&r2=1.8

[Qemu-devel] Run Qemu ARM system without MMU (MMUless)

[Tieu Ma Dau]

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Hi all,
 If I want to run Qemu ARM system to simulate a system without MMU (MMU less), how can I do?
 Thanks for your responses and best reagards,
 Tieu
 
 		
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Re: [Qemu-devel] Run Qemu ARM system without MMU (MMUless)

[Thorsten Zitterell]

Tieu Ma Dau wrote:
> If I want to run Qemu ARM system to simulate a system without MMU (MMU 
> less), how can I do?
> Thanks for your responses and best reagards,
> Tieu

Hi,

according to target-arm/helper.c the MMU is enabled/disabled with 
coprocessor 15.

     if ((env->cp15.c1_sys & 1) == 0) {
         /* MMU diusabled.  */
         *phys_ptr = address;
         *prot = PAGE_READ | PAGE_WRITE;
     } else {
         /* Pagetable walk.  */
     }

It is disabled when QEMU starts...

--
Thorsten

Re: [Qemu-devel] Run Qemu ARM system without MMU (MMUless)

[Tieu Ma Dau]

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Thorsten Zitterell <the.real.hik@gmx.net> wrote:according to target-arm/helper.c the MMU is enabled/disabled with 
coprocessor 15.

     if ((env->cp15.c1_sys & 1) == 0) {
         /* MMU diusabled.  */
         *phys_ptr = address;
         *prot = PAGE_READ | PAGE_WRITE;
     } else {
         /* Pagetable walk.  */
     }

It is disabled when QEMU starts...
Hi, 
 Thanks for your response but I'm a newbie in ARM Linux and ARM CPU. Could you explain more clearly how can I disable this.
 Thanks a lot
 Tieu

 		
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Re: [Qemu-devel] Run Qemu ARM system without MMU (MMUless)

[Paul Brook]

>  Thanks for your response but I'm a newbie in ARM Linux and ARM CPU. Could
> you explain more clearly how can I disable this. Thanks a lot

Why exactly do you need to simulate a CPU without an MMU?

As other people have pointed out the MMU has no effect until it is enabled. 
Nothing is forcing your OS to use the MMU.

Paul