On Saturday 25 December 2010, Guan Xuetao wrote:
> +#ifdef __KERNEL__
> +
> +/*
> + * Memory map description
> + */
> +# define NR_BANKS 8
> +
> +struct membank {
> + unsigned long start;
> + unsigned long size;
> + unsigned int highmem;
> +};
> +
> +struct meminfo {
> + int nr_banks;
> + struct membank bank[NR_BANKS];
> +};
> +
> +extern struct meminfo meminfo;
> +
> +#define for_each_bank(iter, mi) \
> + for (iter = 0; iter < (mi)->nr_banks; iter++)
> +
> +#define bank_pfn_start(bank) __phys_to_pfn((bank)->start)
> +#define bank_pfn_end(bank) __phys_to_pfn((bank)->start + (bank)->size)
> +#define bank_pfn_size(bank) ((bank)->size >> PAGE_SHIFT)
> +#define bank_phys_start(bank) ((bank)->start)
> +#define bank_phys_end(bank) ((bank)->start + (bank)->size)
> +#define bank_phys_size(bank) ((bank)->size)
The membank stuff looks like a variation of the generic memblock interfaces.
> +/*
> + * Handle all unrecognised system calls.
> + * 0x9f0000 - 0x9fffff are some more esoteric system calls
> + */
> +#define NR(x) ((__UNICORE_NR_##x) - __UNICORE_NR_BASE)
> +asmlinkage int uc32_syscall(int no, struct pt_regs *regs)
> +{
> + if ((no >> 16) != (__UNICORE_NR_BASE >> 16))
> + return -ENOSYS;
> +
> + switch (no & 0xffff) {
> + /*
> + * Flush a region from virtual address 'r0' to virtual address 'r1'
> + * _exclusive_. There is no alignment requirement on either address;
> + * user space does not need to know the hardware cache layout.
> + *
> + * r2 contains flags. It should ALWAYS be passed as ZERO until it
> + * is defined to be something else. For now we ignore it, but may
> + * the fires of hell burn in your belly if you break this rule. ;)
> + *
> + * (at a later date, we may want to allow this call to not flush
> + * various aspects of the cache. Passing '0' will guarantee that
> + * everything necessary gets flushed to maintain consistency in
> + * the specified region).
> + */
> + case NR(cacheflush):
> + do_cache_op(regs->UCreg_00, regs->UCreg_01, regs->UCreg_02);
> + return 0;
> +
> + case NR(cmpxchg):
> + return do_cmpxchg_op(regs);
> +
> + default:
> + return -ENOSYS;
> + }
> +}
With the generic system cal interface, this function should be replaced
with straight system calls for each of the subfunctions.
Just use things definitions like
#define __NR_cacheflush __NR_arch_specific_syscall
__SYSCALL(__NR_cacheflush, sys_uc32_cacheflush)
#define __NR_cmpxchg __NR_arch_specific_syscall+1
__SYSCALL(__NR_cmpxchg, sys_uc32_cacheflush
in your asm/unistd.h file.
Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
