1#ifndef _ASM_CRIS_ARCH_PROCESSOR_H 2#define _ASM_CRIS_ARCH_PROCESSOR_H 3 4 5/* Return current instruction pointer. */ 6#define current_text_addr() \ 7 ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;}) 8 9/* 10 * Since CRIS doesn't do hardware task-switching this hasn't really anything to 11 * do with the proccessor itself, it's just here for legacy reasons. This is 12 * used when task-switching using _resume defined in entry.S. The offsets here 13 * are hardcoded into _resume, so if this struct is changed, entry.S needs to be 14 * changed as well. 15 */ 16struct thread_struct { 17 unsigned long ksp; /* Kernel stack pointer. */ 18 unsigned long usp; /* User stack pointer. */ 19 unsigned long ccs; /* Saved flags register. */ 20}; 21 22/* 23 * User-space process size. This is hardcoded into a few places, so don't 24 * changed it unless everything's clear! 25 */ 26#ifndef CONFIG_ETRAX_VCS_SIM 27#define TASK_SIZE (0xB0000000UL) 28#else 29#define TASK_SIZE (0xA0000000UL) 30#endif 31 32/* CCS I=1, enable interrupts. */ 33#define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) } 34 35#define KSTK_EIP(tsk) \ 36({ \ 37 unsigned long eip = 0; \ 38 unsigned long regs = (unsigned long)task_pt_regs(tsk); \ 39 if (regs > PAGE_SIZE && virt_addr_valid(regs)) \ 40 eip = ((struct pt_regs *)regs)->erp; \ 41 eip; \ 42}) 43 44/* 45 * Give the thread a program location, set user-mode and switch user 46 * stackpointer. 47 */ 48#define start_thread(regs, ip, usp) \ 49do { \ 50 set_fs(USER_DS); \ 51 regs->erp = ip; \ 52 regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \ 53 wrusp(usp); \ 54} while(0) 55 56/* Nothing special to do for v32 when handling a kernel bus fault fixup. */ 57#define arch_fixup(regs) {}; 58 59#endif /* _ASM_CRIS_ARCH_PROCESSOR_H */ 60