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