Hello all,
I'm new to this group. We are trying to get a working kernel for
Samsung S3C4510B processor. While looking though the code for ARM, we
have some across the following header file include/asm-arm/proc-fns.h
/*
* Work out if we need multiple CPU support
*/
#undef MULTI_CPU
#undef CPU_NAME
/*
* CPU_NAME - the prefix for CPU related functions
*/
# ifdef CONFIG_CPU_ARM7TDMI
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm7tdmi
# endif
# endif
In the beginning of the header file MULTI_CPU and CPU_NAME has been
undefined. My question is if they have been undefined, what is the
significance of the code #ifdef CPU_NAME? Also i would like to know the
significance of __catify_fn.
/*
* Single CPU
*/
#ifdef __STDC__
#define __catify_fn(name,x) name##x
#else
#define __catify_fn(name,x) name/**/x
#endif
#define __cpu_fn(name,x) __catify_fn(name,x)
/*
* If we are supporting multiple CPUs, then we must use a table of
* function pointers for this lot. Otherwise, we can optimise the
* table away.
*/
#define cpu_proc_init __cpu_fn(CPU_NAME,_proc_init)
Thanks for all your support.
Thanks
Surej
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