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Re: Enable SMP support


From: Almudena Garcia
Subject: Re: Enable SMP support
Date: Fri, 15 Jun 2018 00:31:52 +0200

Yes, I concluded the same a few hours ago. I tried to edit kern/cpu_number.h, to add a new definition with many cores, at this form

int     master_cpu;     /* 'master' processor - keeps time */

#if     (NCPUS == 1)
        /* cpu number is always 0 on a single processor system */
#define cpu_number()    (0)

#define CPU_L1_SIZE (1 << CPU_L1_SHIFT)

#else
#define cpu_number() (NCPUS)

#endif  /* NCPUS == 1 */
#endif /* _KERN_CPU_NUMBER_H_ */

But this was unsuccessfull. Now I'm trying to edit i386/i386/cpu_number.h to hardcode this function

#ifndef _I386_CPU_NUMBER_H_
#define _I386_CPU_NUMBER_H_

#if     NCPUS > 1

/* More-specific code must define cpu_number() and CPU_NUMBER.  */
#define CX(addr, reg)   addr(,reg,4)
#define CPU_NUMBER(NCPUS)

#else   /* NCPUS == 1 */

#define CPU_NUMBER(reg)
#define CX(addr,reg)    addr

#endif  /* NCPUS == 1 */

#ifndef __ASSEMBLER__
#include "kern/cpu_number.h"
#endif


But problem continues, so I think that the original problem is in a lower level than this, (probably there isn't any implementation to multiprocessor case internally)

2018-06-15 0:14 GMT+02:00 Svante Signell <address@hidden>:
On Thu, 2018-06-14 at 20:21 +0200, Almudena Garcia wrote:
> Ok, I found the warning what you refers
>
> ../kern/thread.h:401:42: warning: implicit declaration of function
> ‘cpu_number’; did you mean ‘cpu_idle’? [-Wimplicit-function-
> declaration]
>
> After check the cpu_number.h file, feels that It don't define the
> cpu_number function in multi-processor mode
>
> https://pastebin.com/rnpVCtXp
>
> But I don't found the source file to this library, to check the
> implementation.

Hi Almudena,

Did you see the kernel headers
i386/i386/cpu_number.h
...
/*
 *      Machine-dependent definitions for cpu identification.
 *
 */
#ifndef _I386_CPU_NUMBER_H_
#define _I386_CPU_NUMBER_H_

#if     NCPUS > 1

/* More-specific code must define cpu_number() and CPU_NUMBER.  */
#define CX(addr, reg)   addr(,reg,4)

#else   /* NCPUS == 1 */

#define CPU_NUMBER(reg)
#define CX(addr,reg)    addr

#endif  /* NCPUS == 1 */

#ifndef __ASSEMBLER__
#include "kern/cpu_number.h"
#endif

#endif  /* _I386_CPU_NUMBER_H_ */

and kern/cpu_number.h:

#ifndef _KERN_CPU_NUMBER_H_
#define _KERN_CPU_NUMBER_H_

/*
 *      Definitions for cpu identification in multi-processors.
 */

int     master_cpu;     /* 'master' processor - keeps time */

#if     (NCPUS == 1)
        /* cpu number is always 0 on a single processor system */
#define cpu_number()    (0)

#define CPU_L1_SIZE (1 << CPU_L1_SHIFT)

#endif  /* NCPUS == 1 */
#endif /* _KERN_CPU_NUMBER_H_ */

There are no definitions of cpu_number() for more processors than one
:(


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