1/* 2 * Copyright (C) 2010 Imagination Technologies 3 */ 4 5#ifndef __ASM_METAG_USER_GATEWAY_H 6#define __ASM_METAG_USER_GATEWAY_H 7 8#include <asm/page.h> 9 10/* Page of kernel code accessible to userspace. */ 11#define USER_GATEWAY_PAGE 0x6ffff000 12/* Offset of TLS pointer array in gateway page. */ 13#define USER_GATEWAY_TLS 0x100 14 15#ifndef __ASSEMBLY__ 16 17extern char __user_gateway_start; 18extern char __user_gateway_end; 19 20/* Kernel mapping of the gateway page. */ 21extern void *gateway_page; 22 23static inline void set_gateway_tls(void __user *tls_ptr) 24{ 25 void **gateway_tls = (void **)(gateway_page + USER_GATEWAY_TLS + 26 hard_processor_id() * 4); 27 28 *gateway_tls = (__force void *)tls_ptr; 29#ifdef CONFIG_METAG_META12 30 /* Avoid cache aliases on virtually tagged cache. */ 31 __builtin_dcache_flush((void *)USER_GATEWAY_PAGE + USER_GATEWAY_TLS + 32 hard_processor_id() * sizeof(void *)); 33#endif 34} 35 36extern int __kuser_get_tls(void); 37extern char *__kuser_get_tls_end[]; 38 39extern int __kuser_cmpxchg(int, int, unsigned long *); 40extern char *__kuser_cmpxchg_end[]; 41 42#endif 43 44#endif 45