1 /*
2 * include/asm-sh/processor.h
3 *
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002, 2003 Paul Mundt
6 */
7
8 #ifndef __ASM_SH_PROCESSOR_32_H
9 #define __ASM_SH_PROCESSOR_32_H
10 #ifdef __KERNEL__
11
12 #include <linux/compiler.h>
13 #include <linux/linkage.h>
14 #include <asm/page.h>
15 #include <asm/types.h>
16 #include <asm/hw_breakpoint.h>
17
18 /*
19 * Default implementation of macro that returns current
20 * instruction pointer ("program counter").
21 */
22 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
23
24 /* Core Processor Version Register */
25 #define CCN_PVR 0xff000030
26 #define CCN_CVR 0xff000040
27 #define CCN_PRR 0xff000044
28
29 /*
30 * User space process size: 2GB.
31 *
32 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
33 */
34 #define TASK_SIZE 0x7c000000UL
35
36 #define STACK_TOP TASK_SIZE
37 #define STACK_TOP_MAX STACK_TOP
38
39 /* This decides where the kernel will search for a free chunk of vm
40 * space during mmap's.
41 */
42 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
43
44 /*
45 * Bit of SR register
46 *
47 * FD-bit:
48 * When it's set, it means the processor doesn't have right to use FPU,
49 * and it results exception when the floating operation is executed.
50 *
51 * IMASK-bit:
52 * Interrupt level mask
53 */
54 #define SR_DSP 0x00001000
55 #define SR_IMASK 0x000000f0
56 #define SR_FD 0x00008000
57 #define SR_MD 0x40000000
58
59 /*
60 * DSP structure and data
61 */
62 struct sh_dsp_struct {
63 unsigned long dsp_regs[14];
64 long status;
65 };
66
67 /*
68 * FPU structure and data
69 */
70
71 struct sh_fpu_hard_struct {
72 unsigned long fp_regs[16];
73 unsigned long xfp_regs[16];
74 unsigned long fpscr;
75 unsigned long fpul;
76
77 long status; /* software status information */
78 };
79
80 /* Dummy fpu emulator */
81 struct sh_fpu_soft_struct {
82 unsigned long fp_regs[16];
83 unsigned long xfp_regs[16];
84 unsigned long fpscr;
85 unsigned long fpul;
86
87 unsigned char lookahead;
88 unsigned long entry_pc;
89 };
90
91 union thread_xstate {
92 struct sh_fpu_hard_struct hardfpu;
93 struct sh_fpu_soft_struct softfpu;
94 };
95
96 struct thread_struct {
97 /* Saved registers when thread is descheduled */
98 unsigned long sp;
99 unsigned long pc;
100
101 /* Various thread flags, see SH_THREAD_xxx */
102 unsigned long flags;
103
104 /* Save middle states of ptrace breakpoints */
105 struct perf_event *ptrace_bps[HBP_NUM];
106
107 #ifdef CONFIG_SH_DSP
108 /* Dsp status information */
109 struct sh_dsp_struct dsp_status;
110 #endif
111
112 /* Extended processor state */
113 union thread_xstate *xstate;
114 };
115
116 #define INIT_THREAD { \
117 .sp = sizeof(init_stack) + (long) &init_stack, \
118 .flags = 0, \
119 }
120
121 /* Forward declaration, a strange C thing */
122 struct task_struct;
123
124 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
125
126 /* Free all resources held by a thread. */
127 extern void release_thread(struct task_struct *);
128
129 /* Prepare to copy thread state - unlazy all lazy status */
130 void prepare_to_copy(struct task_struct *tsk);
131
132 /*
133 * create a kernel thread without removing it from tasklists
134 */
135 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
136
137 /* Copy and release all segment info associated with a VM */
138 #define copy_segments(p, mm) do { } while(0)
139 #define release_segments(mm) do { } while(0)
140
141 /*
142 * FPU lazy state save handling.
143 */
144
disable_fpu(void)145 static __inline__ void disable_fpu(void)
146 {
147 unsigned long __dummy;
148
149 /* Set FD flag in SR */
150 __asm__ __volatile__("stc sr, %0\n\t"
151 "or %1, %0\n\t"
152 "ldc %0, sr"
153 : "=&r" (__dummy)
154 : "r" (SR_FD));
155 }
156
enable_fpu(void)157 static __inline__ void enable_fpu(void)
158 {
159 unsigned long __dummy;
160
161 /* Clear out FD flag in SR */
162 __asm__ __volatile__("stc sr, %0\n\t"
163 "and %1, %0\n\t"
164 "ldc %0, sr"
165 : "=&r" (__dummy)
166 : "r" (~SR_FD));
167 }
168
169 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
170 #define FPSCR_INIT 0x00080000
171
172 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
173 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
174
175 /*
176 * Return saved PC of a blocked thread.
177 */
178 #define thread_saved_pc(tsk) (tsk->thread.pc)
179
180 void show_trace(struct task_struct *tsk, unsigned long *sp,
181 struct pt_regs *regs);
182
183 #ifdef CONFIG_DUMP_CODE
184 void show_code(struct pt_regs *regs);
185 #else
show_code(struct pt_regs * regs)186 static inline void show_code(struct pt_regs *regs)
187 {
188 }
189 #endif
190
191 extern unsigned long get_wchan(struct task_struct *p);
192
193 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
194 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
195
196 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
197
198 #define PREFETCH_STRIDE L1_CACHE_BYTES
199 #define ARCH_HAS_PREFETCH
200 #define ARCH_HAS_PREFETCHW
201
prefetch(const void * x)202 static inline void prefetch(const void *x)
203 {
204 __builtin_prefetch(x, 0, 3);
205 }
206
prefetchw(const void * x)207 static inline void prefetchw(const void *x)
208 {
209 __builtin_prefetch(x, 1, 3);
210 }
211 #endif
212
213 #endif /* __KERNEL__ */
214 #endif /* __ASM_SH_PROCESSOR_32_H */
215