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Re: Enable SMP support
From: |
Richard Braun |
Subject: |
Re: Enable SMP support |
Date: |
Fri, 15 Jun 2018 19:25:06 +0200 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Fri, Jun 15, 2018 at 07:18:55PM +0200, Richard Braun wrote:
> On Fri, Jun 15, 2018 at 06:27:21PM +0200, Almudena Garcia wrote:
> > I'm trying to define the cpu_number() in multiprocessor.
> >
> > To do this, I tried to use CPUID assembly x86 instruction, to get the CPU
> > SMP number.
> > The function, in C, is this:
> >
> > static inline char smp_processor_id(void) {
> > char apic_id = 0;
> > asm("mov $1, %%eax\n\t"
> > "cpuid\n\t"
> > "mov %%bh, %0\n\t" : "=g" (apic_id));
> > return apic_id;
> > }
> >
> > In Linux, after executing this in a test source, It returns '8'
> >
> > But, when I try to execute It in Hurd, It shows a segmentation fault.
> >
> > I attach the test source file
> >
> >
> > Can you help me?
Also note here that you're confusing the APIC ID, a device identifier at
the hardware level, with the CPU ID, a processor identifier at the kernel
level. On some machines, the APIC ID may be higher than or equal to the
maximum number of processor installed.
--
Richard Braun
- Re: Enable SMP support, (continued)
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Samuel Thibault, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Svante Signell, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Amos Jeffries, 2018/06/14
- Re: Enable SMP support, liberamenso10000, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/15
- Re: Enable SMP support, Richard Braun, 2018/06/15
- Re: Enable SMP support,
Richard Braun <=
- Re: Enable SMP support, Almudena Garcia, 2018/06/15
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Samuel Thibault, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Samuel Thibault, 2018/06/17
- Re: Enable SMP support, Almudena Garcia, 2018/06/17
- Re: Enable SMP support, Almudena Garcia, 2018/06/18