2 * include/asm-sh/processor.h
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002, 2003 Paul Mundt
8 #ifndef __ASM_SH_PROCESSOR_32_H
9 #define __ASM_SH_PROCESSOR_32_H
12 #include <linux/compiler.h>
13 #include <linux/linkage.h>
15 #include <asm/types.h>
16 #include <asm/ptrace.h>
17 #include <asm/hw_breakpoint.h>
20 * Default implementation of macro that returns current
21 * instruction pointer ("program counter").
23 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
25 /* Core Processor Version Register */
26 #define CCN_PVR 0xff000030
27 #define CCN_CVR 0xff000040
28 #define CCN_PRR 0xff000044
30 asmlinkage void __init sh_cpu_init(void);
33 * User space process size: 2GB.
35 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
37 #define TASK_SIZE 0x7c000000UL
39 #define STACK_TOP TASK_SIZE
40 #define STACK_TOP_MAX STACK_TOP
42 /* This decides where the kernel will search for a free chunk of vm
43 * space during mmap's.
45 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
51 * When it's set, it means the processor doesn't have right to use FPU,
52 * and it results exception when the floating operation is executed.
55 * Interrupt level mask
57 #define SR_DSP 0x00001000
58 #define SR_IMASK 0x000000f0
59 #define SR_FD 0x00008000
60 #define SR_MD 0x40000000
63 * DSP structure and data
65 struct sh_dsp_struct {
66 unsigned long dsp_regs[14];
71 * FPU structure and data
74 struct sh_fpu_hard_struct {
75 unsigned long fp_regs[16];
76 unsigned long xfp_regs[16];
80 long status; /* software status information */
83 /* Dummy fpu emulator */
84 struct sh_fpu_soft_struct {
85 unsigned long fp_regs[16];
86 unsigned long xfp_regs[16];
90 unsigned char lookahead;
91 unsigned long entry_pc;
95 struct sh_fpu_hard_struct hardfpu;
96 struct sh_fpu_soft_struct softfpu;
99 struct thread_struct {
100 /* Saved registers when thread is descheduled */
104 /* Various thread flags, see SH_THREAD_xxx */
107 /* Save middle states of ptrace breakpoints */
108 struct perf_event *ptrace_bps[HBP_NUM];
111 /* Dsp status information */
112 struct sh_dsp_struct dsp_status;
115 /* Extended processor state */
116 union thread_xstate *xstate;
119 #define INIT_THREAD { \
120 .sp = sizeof(init_stack) + (long) &init_stack, \
124 /* Forward declaration, a strange C thing */
127 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
129 /* Free all resources held by a thread. */
130 extern void release_thread(struct task_struct *);
132 /* Prepare to copy thread state - unlazy all lazy status */
133 void prepare_to_copy(struct task_struct *tsk);
136 * create a kernel thread without removing it from tasklists
138 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
140 /* Copy and release all segment info associated with a VM */
141 #define copy_segments(p, mm) do { } while(0)
142 #define release_segments(mm) do { } while(0)
145 * FPU lazy state save handling.
148 static __inline__ void disable_fpu(void)
150 unsigned long __dummy;
152 /* Set FD flag in SR */
153 __asm__ __volatile__("stc sr, %0\n\t"
160 static __inline__ void enable_fpu(void)
162 unsigned long __dummy;
164 /* Clear out FD flag in SR */
165 __asm__ __volatile__("stc sr, %0\n\t"
172 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
173 #define FPSCR_INIT 0x00080000
175 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
176 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
179 * Return saved PC of a blocked thread.
181 #define thread_saved_pc(tsk) (tsk->thread.pc)
183 void show_trace(struct task_struct *tsk, unsigned long *sp,
184 struct pt_regs *regs);
186 #ifdef CONFIG_DUMP_CODE
187 void show_code(struct pt_regs *regs);
189 static inline void show_code(struct pt_regs *regs)
194 extern unsigned long get_wchan(struct task_struct *p);
196 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
197 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
199 #define user_stack_pointer(_regs) ((_regs)->regs[15])
201 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
202 #define PREFETCH_STRIDE L1_CACHE_BYTES
203 #define ARCH_HAS_PREFETCH
204 #define ARCH_HAS_PREFETCHW
205 static inline void prefetch(void *x)
207 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
210 #define prefetchw(x) prefetch(x)
213 #endif /* __KERNEL__ */
214 #endif /* __ASM_SH_PROCESSOR_32_H */