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>
14 #include <asm/types.h>
15 #include <asm/cache.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\n1:":"=z" (pc)); pc; })
24 /* Core Processor Version Register */
25 #define CCN_PVR 0xff000030
26 #define CCN_CVR 0xff000040
27 #define CCN_PRR 0xff000044
31 unsigned long loops_per_jiffy;
32 unsigned long asid_cache;
34 struct cache_info icache; /* Primary I-cache */
35 struct cache_info dcache; /* Primary D-cache */
36 struct cache_info scache; /* Secondary cache */
39 } __attribute__ ((aligned(L1_CACHE_BYTES)));
41 extern struct sh_cpuinfo cpu_data[];
42 #define boot_cpu_data cpu_data[0]
43 #define current_cpu_data cpu_data[smp_processor_id()]
44 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
47 * User space process size: 2GB.
49 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
51 #define TASK_SIZE 0x7c000000UL
53 /* This decides where the kernel will search for a free chunk of vm
54 * space during mmap's.
56 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
62 * When it's set, it means the processor doesn't have right to use FPU,
63 * and it results exception when the floating operation is executed.
66 * Interrupt level mask
68 #define SR_FD 0x00008000
69 #define SR_DSP 0x00001000
70 #define SR_IMASK 0x000000f0
73 * FPU structure and data
76 struct sh_fpu_hard_struct {
77 unsigned long fp_regs[16];
78 unsigned long xfp_regs[16];
82 long status; /* software status information */
85 /* Dummy fpu emulator */
86 struct sh_fpu_soft_struct {
87 unsigned long fp_regs[16];
88 unsigned long xfp_regs[16];
92 unsigned char lookahead;
93 unsigned long entry_pc;
97 struct sh_fpu_hard_struct hard;
98 struct sh_fpu_soft_struct soft;
101 struct thread_struct {
102 /* Saved registers when thread is descheduled */
106 /* Hardware debugging registers */
107 unsigned long ubc_pc;
109 /* floating point info */
110 union sh_fpu_union fpu;
117 /* Count of active tasks with UBC settings */
118 extern int ubc_usercnt;
120 #define INIT_THREAD { \
121 .sp = sizeof(init_stack) + (long) &init_stack, \
125 * Do necessary setup to start up a newly executed thread.
127 #define start_thread(regs, new_pc, new_sp) \
130 regs->sr = SR_FD; /* User mode. */ \
132 regs->regs[15] = new_sp
134 /* Forward declaration, a strange C thing */
138 /* Free all resources held by a thread. */
139 extern void release_thread(struct task_struct *);
141 /* Prepare to copy thread state - unlazy all lazy status */
142 #define prepare_to_copy(tsk) do { } while (0)
145 * create a kernel thread without removing it from tasklists
147 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
149 /* Copy and release all segment info associated with a VM */
150 #define copy_segments(p, mm) do { } while(0)
151 #define release_segments(mm) do { } while(0)
154 * FPU lazy state save handling.
157 static __inline__ void disable_fpu(void)
159 unsigned long __dummy;
161 /* Set FD flag in SR */
162 __asm__ __volatile__("stc sr, %0\n\t"
169 static __inline__ void enable_fpu(void)
171 unsigned long __dummy;
173 /* Clear out FD flag in SR */
174 __asm__ __volatile__("stc sr, %0\n\t"
181 static __inline__ void release_fpu(struct pt_regs *regs)
186 static __inline__ void grab_fpu(struct pt_regs *regs)
191 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
193 #define unlazy_fpu(tsk, regs) do { \
194 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
195 save_fpu(tsk, regs); \
199 #define clear_fpu(tsk, regs) do { \
200 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
201 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
206 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
207 #define FPSCR_INIT 0x00080000
209 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
210 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
213 * Return saved PC of a blocked thread.
215 #define thread_saved_pc(tsk) (tsk->thread.pc)
217 void show_trace(struct task_struct *tsk, unsigned long *sp,
218 struct pt_regs *regs);
219 extern unsigned long get_wchan(struct task_struct *p);
221 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
222 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
224 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
225 #define cpu_relax() barrier()
227 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
228 defined(CONFIG_CPU_SH4)
229 #define PREFETCH_STRIDE L1_CACHE_BYTES
230 #define ARCH_HAS_PREFETCH
231 #define ARCH_HAS_PREFETCHW
232 static inline void prefetch(void *x)
234 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
237 #define prefetchw(x) prefetch(x)
240 #ifdef CONFIG_VSYSCALL
241 extern int vsyscall_init(void);
243 #define vsyscall_init() do { } while (0)
246 #endif /* __KERNEL__ */
247 #endif /* __ASM_SH_PROCESSOR_32_H */