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[linux-ginger.git] / arch / sh / include / asm / processor_32.h
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1 /*
2 * include/asm-sh/processor.h
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002, 2003 Paul Mundt
6 */
8 #ifndef __ASM_SH_PROCESSOR_32_H
9 #define __ASM_SH_PROCESSOR_32_H
10 #ifdef __KERNEL__
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>
19 * Default implementation of macro that returns current
20 * instruction pointer ("program counter").
22 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
24 /* Core Processor Version Register */
25 #define CCN_PVR 0xff000030
26 #define CCN_CVR 0xff000040
27 #define CCN_PRR 0xff000044
29 asmlinkage void __init sh_cpu_init(void);
32 * User space process size: 2GB.
34 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
36 #define TASK_SIZE 0x7c000000UL
38 #define STACK_TOP TASK_SIZE
39 #define STACK_TOP_MAX STACK_TOP
41 /* This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
44 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
47 * Bit of SR register
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.
53 * IMASK-bit:
54 * Interrupt level mask
56 #define SR_DSP 0x00001000
57 #define SR_IMASK 0x000000f0
58 #define SR_FD 0x00008000
61 * DSP structure and data
63 struct sh_dsp_struct {
64 unsigned long dsp_regs[14];
65 long status;
69 * FPU structure and data
72 struct sh_fpu_hard_struct {
73 unsigned long fp_regs[16];
74 unsigned long xfp_regs[16];
75 unsigned long fpscr;
76 unsigned long fpul;
78 long status; /* software status information */
81 /* Dummy fpu emulator */
82 struct sh_fpu_soft_struct {
83 unsigned long fp_regs[16];
84 unsigned long xfp_regs[16];
85 unsigned long fpscr;
86 unsigned long fpul;
88 unsigned char lookahead;
89 unsigned long entry_pc;
92 union sh_fpu_union {
93 struct sh_fpu_hard_struct hard;
94 struct sh_fpu_soft_struct soft;
97 struct thread_struct {
98 /* Saved registers when thread is descheduled */
99 unsigned long sp;
100 unsigned long pc;
102 /* Hardware debugging registers */
103 unsigned long ubc_pc;
105 /* floating point info */
106 union sh_fpu_union fpu;
108 #ifdef CONFIG_SH_DSP
109 /* Dsp status information */
110 struct sh_dsp_struct dsp_status;
111 #endif
114 /* Count of active tasks with UBC settings */
115 extern int ubc_usercnt;
117 #define INIT_THREAD { \
118 .sp = sizeof(init_stack) + (long) &init_stack, \
122 * Do necessary setup to start up a newly executed thread.
124 #define start_thread(_regs, new_pc, new_sp) \
125 set_fs(USER_DS); \
126 _regs->pr = 0; \
127 _regs->sr = SR_FD; /* User mode. */ \
128 _regs->pc = new_pc; \
129 _regs->regs[15] = new_sp
131 /* Forward declaration, a strange C thing */
132 struct task_struct;
133 struct mm_struct;
135 /* Free all resources held by a thread. */
136 extern void release_thread(struct task_struct *);
138 /* Prepare to copy thread state - unlazy all lazy status */
139 #define prepare_to_copy(tsk) do { } while (0)
142 * create a kernel thread without removing it from tasklists
144 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
146 /* Copy and release all segment info associated with a VM */
147 #define copy_segments(p, mm) do { } while(0)
148 #define release_segments(mm) do { } while(0)
151 * FPU lazy state save handling.
154 static __inline__ void disable_fpu(void)
156 unsigned long __dummy;
158 /* Set FD flag in SR */
159 __asm__ __volatile__("stc sr, %0\n\t"
160 "or %1, %0\n\t"
161 "ldc %0, sr"
162 : "=&r" (__dummy)
163 : "r" (SR_FD));
166 static __inline__ void enable_fpu(void)
168 unsigned long __dummy;
170 /* Clear out FD flag in SR */
171 __asm__ __volatile__("stc sr, %0\n\t"
172 "and %1, %0\n\t"
173 "ldc %0, sr"
174 : "=&r" (__dummy)
175 : "r" (~SR_FD));
178 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
179 #define FPSCR_INIT 0x00080000
181 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
182 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
185 * Return saved PC of a blocked thread.
187 #define thread_saved_pc(tsk) (tsk->thread.pc)
189 void show_trace(struct task_struct *tsk, unsigned long *sp,
190 struct pt_regs *regs);
192 #ifdef CONFIG_DUMP_CODE
193 void show_code(struct pt_regs *regs);
194 #else
195 static inline void show_code(struct pt_regs *regs)
198 #endif
200 extern unsigned long get_wchan(struct task_struct *p);
202 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
203 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
205 #define user_stack_pointer(_regs) ((_regs)->regs[15])
207 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
208 #define PREFETCH_STRIDE L1_CACHE_BYTES
209 #define ARCH_HAS_PREFETCH
210 #define ARCH_HAS_PREFETCHW
211 static inline void prefetch(void *x)
213 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
216 #define prefetchw(x) prefetch(x)
217 #endif
219 #endif /* __KERNEL__ */
220 #endif /* __ASM_SH_PROCESSOR_32_H */