blob: 8455f778b601e64aa02f47be6c59a4cce35423ea [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/asm-m68k/processor.h
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 */
6
7#ifndef __ASM_M68K_PROCESSOR_H
8#define __ASM_M68K_PROCESSOR_H
9
10/*
11 * Default implementation of macro that returns current
12 * instruction pointer ("program counter").
13 */
14#define current_text_addr() ({ __label__ _l; _l: &&_l;})
15
Al Viroabd03752005-11-13 16:06:58 -080016#include <linux/thread_info.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <asm/segment.h>
18#include <asm/fpu.h>
19#include <asm/ptrace.h>
20
21static inline unsigned long rdusp(void)
22{
23 unsigned long usp;
24
25 __asm__ __volatile__("move %/usp,%0" : "=a" (usp));
26 return usp;
27}
28
29static inline void wrusp(unsigned long usp)
30{
31 __asm__ __volatile__("move %0,%/usp" : : "a" (usp));
32}
33
34/*
35 * User space process size: 3.75GB. This is hardcoded into a few places,
36 * so don't change it unless you know what you are doing.
37 */
38#ifndef CONFIG_SUN3
39#define TASK_SIZE (0xF0000000UL)
40#else
41#ifdef __ASSEMBLY__
42#define TASK_SIZE (0x0E000000)
43#else
44#define TASK_SIZE (0x0E000000UL)
45#endif
46#endif
47
48/* This decides where the kernel will search for a free chunk of vm
49 * space during mmap's.
50 */
51#ifndef CONFIG_SUN3
52#define TASK_UNMAPPED_BASE 0xC0000000UL
53#else
54#define TASK_UNMAPPED_BASE 0x0A000000UL
55#endif
56#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058struct thread_struct {
59 unsigned long ksp; /* kernel stack pointer */
60 unsigned long usp; /* user stack pointer */
61 unsigned short sr; /* saved status register */
62 unsigned short fs; /* saved fs (sfc, dfc) */
63 unsigned long crp[2]; /* cpu root pointer */
64 unsigned long esp0; /* points to SR of stack frame */
65 unsigned long faddr; /* info about last fault */
66 int signo, code;
67 unsigned long fp[8*3];
68 unsigned long fpcntl[3]; /* fp control regs */
69 unsigned char fpstate[FPSTATESIZE]; /* floating point state */
Al Viroabd03752005-11-13 16:06:58 -080070 struct thread_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
73#define INIT_THREAD { \
Roman Zippelf6c41922006-06-23 02:04:55 -070074 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
75 .sr = PS_S, \
76 .fs = __KERNEL_DS, \
77 .info = INIT_THREAD_INFO(init_task), \
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80/*
81 * Do necessary setup to start up a newly executed thread.
82 */
83static inline void start_thread(struct pt_regs * regs, unsigned long pc,
84 unsigned long usp)
85{
86 /* reads from user space */
87 set_fs(USER_DS);
88
89 regs->pc = pc;
90 regs->sr &= ~0x2000;
91 wrusp(usp);
92}
93
94/* Forward declaration, a strange C thing */
95struct task_struct;
96
97/* Free all resources held by a thread. */
98static inline void release_thread(struct task_struct *dead_task)
99{
100}
101
102/* Prepare to copy thread state - unlazy all lazy status */
103#define prepare_to_copy(tsk) do { } while (0)
104
105extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
106
107/*
108 * Free current thread data structures etc..
109 */
110static inline void exit_thread(void)
111{
112}
113
114extern unsigned long thread_saved_pc(struct task_struct *tsk);
115
116unsigned long get_wchan(struct task_struct *p);
117
118#define KSTK_EIP(tsk) \
119 ({ \
120 unsigned long eip = 0; \
121 if ((tsk)->thread.esp0 > PAGE_SIZE && \
122 (virt_addr_valid((tsk)->thread.esp0))) \
123 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
124 eip; })
125#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
126
127#define cpu_relax() barrier()
128
129#endif