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 * change it unless everything's clear! 25 */ 26#define TASK_SIZE (0xB0000000UL) 27 28/* CCS I=1, enable interrupts. */ 29#define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) } 30 31#define KSTK_EIP(tsk) \ 32({ \ 33 unsigned long eip = 0; \ 34 unsigned long regs = (unsigned long)task_pt_regs(tsk); \ 35 if (regs > PAGE_SIZE && virt_addr_valid(regs)) \ 36 eip = ((struct pt_regs *)regs)->erp; \ 37 eip; \ 38}) 39 40/* 41 * Give the thread a program location, set user-mode and switch user 42 * stackpointer. 43 */ 44#define start_thread(regs, ip, usp) \ 45do { \ 46 regs->erp = ip; \ 47 regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \ 48 wrusp(usp); \ 49} while(0) 50 51/* Nothing special to do for v32 when handling a kernel bus fault fixup. */ 52#define arch_fixup(regs) {}; 53 54#endif /* _ASM_CRIS_ARCH_PROCESSOR_H */ 55