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/ptrace.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 asmlinkage void __init sh_cpu_init(void);
30
31 /*
32 * User space process size: 2GB.
33 *
34 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
35 */
36 #define TASK_SIZE 0x7c000000UL
37
38 #define STACK_TOP TASK_SIZE
39 #define STACK_TOP_MAX STACK_TOP
40
41 /* This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
43 */
44 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
45
46 /*
47 * Bit of SR register
48 *
49 * FD-bit:
50 * When it's set, it means the processor doesn't have right to use FPU,
51 * and it results exception when the floating operation is executed.
52 *
53 * IMASK-bit:
54 * Interrupt level mask
55 */
56 #define SR_DSP 0x00001000
57 #define SR_IMASK 0x000000f0
58 #define SR_FD 0x00008000
59
60 /*
61 * FPU structure and data
62 */
63
64 struct sh_fpu_hard_struct {
65 unsigned long fp_regs[16];
66 unsigned long xfp_regs[16];
67 unsigned long fpscr;
68 unsigned long fpul;
69
70 long status; /* software status information */
71 };
72
73 /* Dummy fpu emulator */
74 struct sh_fpu_soft_struct {
75 unsigned long fp_regs[16];
76 unsigned long xfp_regs[16];
77 unsigned long fpscr;
78 unsigned long fpul;
79
80 unsigned char lookahead;
81 unsigned long entry_pc;
82 };
83
84 union sh_fpu_union {
85 struct sh_fpu_hard_struct hard;
86 struct sh_fpu_soft_struct soft;
87 };
88
89 struct thread_struct {
90 /* Saved registers when thread is descheduled */
91 unsigned long sp;
92 unsigned long pc;
93
94 /* Hardware debugging registers */
95 unsigned long ubc_pc;
96
97 /* floating point info */
98 union sh_fpu_union fpu;
99 };
100
101 /* Count of active tasks with UBC settings */
102 extern int ubc_usercnt;
103
104 #define INIT_THREAD { \
105 .sp = sizeof(init_stack) + (long) &init_stack, \
106 }
107
108 /*
109 * Do necessary setup to start up a newly executed thread.
110 */
111 #define start_thread(regs, new_pc, new_sp) \
112 set_fs(USER_DS); \
113 regs->pr = 0; \
114 regs->sr = SR_FD; /* User mode. */ \
115 regs->pc = new_pc; \
116 regs->regs[15] = new_sp
117
118 /* Forward declaration, a strange C thing */
119 struct task_struct;
120 struct mm_struct;
121
122 /* Free all resources held by a thread. */
123 extern void release_thread(struct task_struct *);
124
125 /* Prepare to copy thread state - unlazy all lazy status */
126 #define prepare_to_copy(tsk) do { } while (0)
127
128 /*
129 * create a kernel thread without removing it from tasklists
130 */
131 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
132
133 /* Copy and release all segment info associated with a VM */
134 #define copy_segments(p, mm) do { } while(0)
135 #define release_segments(mm) do { } while(0)
136
137 /*
138 * FPU lazy state save handling.
139 */
140
disable_fpu(void)141 static __inline__ void disable_fpu(void)
142 {
143 unsigned long __dummy;
144
145 /* Set FD flag in SR */
146 __asm__ __volatile__("stc sr, %0\n\t"
147 "or %1, %0\n\t"
148 "ldc %0, sr"
149 : "=&r" (__dummy)
150 : "r" (SR_FD));
151 }
152
enable_fpu(void)153 static __inline__ void enable_fpu(void)
154 {
155 unsigned long __dummy;
156
157 /* Clear out FD flag in SR */
158 __asm__ __volatile__("stc sr, %0\n\t"
159 "and %1, %0\n\t"
160 "ldc %0, sr"
161 : "=&r" (__dummy)
162 : "r" (~SR_FD));
163 }
164
165 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
166 #define FPSCR_INIT 0x00080000
167
168 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
169 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
170
171 /*
172 * Return saved PC of a blocked thread.
173 */
174 #define thread_saved_pc(tsk) (tsk->thread.pc)
175
176 void show_trace(struct task_struct *tsk, unsigned long *sp,
177 struct pt_regs *regs);
178
179 #ifdef CONFIG_DUMP_CODE
180 void show_code(struct pt_regs *regs);
181 #else
show_code(struct pt_regs * regs)182 static inline void show_code(struct pt_regs *regs)
183 {
184 }
185 #endif
186
187 extern unsigned long get_wchan(struct task_struct *p);
188
189 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
190 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
191
192 #define user_stack_pointer(regs) ((regs)->regs[15])
193
194 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
195 defined(CONFIG_CPU_SH4)
196 #define PREFETCH_STRIDE L1_CACHE_BYTES
197 #define ARCH_HAS_PREFETCH
198 #define ARCH_HAS_PREFETCHW
prefetch(void * x)199 static inline void prefetch(void *x)
200 {
201 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
202 }
203
204 #define prefetchw(x) prefetch(x)
205 #endif
206
207 #endif /* __KERNEL__ */
208 #endif /* __ASM_SH_PROCESSOR_32_H */
209