The MAX high_addr for `mmap` on PPC64

[madper]

Hi every one,
     I use the ltp (Linux-Test-Project) and run it on both ppc64 and x86_64.
     There is a code like follows in  
`ltp/testcase/kernel/mem/hugetbl/hugemmap/hugemmap03.c`:
`code`
         #define HIGH_ADDR       (void *)(0x1000000000000)
	/* Attempt to mmap into highmem addr, should get ENOMEM */
	addr = mmap(HIGH_ADDR, map_sz, PROT_READ,
	            MAP_SHARED | MAP_FIXED, fildes, 0);
`code ends`
     It return ENOMEM on x86_64 as well as we expected. But return EINVAL  
on ppc64. So I want to know the MAX high addr for PPC64.

-- 
Thanks,
Madper Xie.