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