fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sh / processor.h
blob4f2922a1979c5fef654b9444c818123773cd4eab
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_H
9 #define __ASM_SH_PROCESSOR_H
10 #ifdef __KERNEL__
12 #include <linux/compiler.h>
13 #include <asm/page.h>
14 #include <asm/types.h>
15 #include <asm/cache.h>
16 #include <asm/ptrace.h>
17 #include <asm/cpu-features.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\n1:":"=z" (pc)); pc; })
25 /* Core Processor Version Register */
26 #define CCN_PVR 0xff000030
27 #define CCN_CVR 0xff000040
28 #define CCN_PRR 0xff000044
31 * CPU type and hardware bug flags. Kept separately for each CPU.
33 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
34 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
35 * for parsing the subtype in get_cpu_subtype().
37 enum cpu_type {
38 /* SH-2 types */
39 CPU_SH7619,
41 /* SH-2A types */
42 CPU_SH7206,
44 /* SH-3 types */
45 CPU_SH7705, CPU_SH7706, CPU_SH7707,
46 CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
47 CPU_SH7709, CPU_SH7709A, CPU_SH7710, CPU_SH7712,
48 CPU_SH7720, CPU_SH7729,
50 /* SH-4 types */
51 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
52 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
54 /* SH-4A types */
55 CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, CPU_SHX3,
57 /* SH4AL-DSP types */
58 CPU_SH7343, CPU_SH7722,
60 /* Unknown subtype */
61 CPU_SH_NONE
64 struct sh_cpuinfo {
65 unsigned int type;
66 unsigned long loops_per_jiffy;
67 unsigned long asid_cache;
69 struct cache_info icache; /* Primary I-cache */
70 struct cache_info dcache; /* Primary D-cache */
71 struct cache_info scache; /* Secondary cache */
73 unsigned long flags;
74 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
76 extern struct sh_cpuinfo cpu_data[];
77 #define boot_cpu_data cpu_data[0]
78 #define current_cpu_data cpu_data[smp_processor_id()]
79 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
82 * User space process size: 2GB.
84 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
86 #define TASK_SIZE 0x7c000000UL
88 /* This decides where the kernel will search for a free chunk of vm
89 * space during mmap's.
91 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
94 * Bit of SR register
96 * FD-bit:
97 * When it's set, it means the processor doesn't have right to use FPU,
98 * and it results exception when the floating operation is executed.
100 * IMASK-bit:
101 * Interrupt level mask
103 #define SR_FD 0x00008000
104 #define SR_DSP 0x00001000
105 #define SR_IMASK 0x000000f0
108 * FPU structure and data
111 struct sh_fpu_hard_struct {
112 unsigned long fp_regs[16];
113 unsigned long xfp_regs[16];
114 unsigned long fpscr;
115 unsigned long fpul;
117 long status; /* software status information */
120 /* Dummy fpu emulator */
121 struct sh_fpu_soft_struct {
122 unsigned long fp_regs[16];
123 unsigned long xfp_regs[16];
124 unsigned long fpscr;
125 unsigned long fpul;
127 unsigned char lookahead;
128 unsigned long entry_pc;
131 union sh_fpu_union {
132 struct sh_fpu_hard_struct hard;
133 struct sh_fpu_soft_struct soft;
136 struct thread_struct {
137 /* Saved registers when thread is descheduled */
138 unsigned long sp;
139 unsigned long pc;
141 /* Hardware debugging registers */
142 unsigned long ubc_pc;
144 /* floating point info */
145 union sh_fpu_union fpu;
148 typedef struct {
149 unsigned long seg;
150 } mm_segment_t;
152 /* Count of active tasks with UBC settings */
153 extern int ubc_usercnt;
155 #define INIT_THREAD { \
156 .sp = sizeof(init_stack) + (long) &init_stack, \
160 * Do necessary setup to start up a newly executed thread.
162 #define start_thread(regs, new_pc, new_sp) \
163 set_fs(USER_DS); \
164 regs->pr = 0; \
165 regs->sr = SR_FD; /* User mode. */ \
166 regs->pc = new_pc; \
167 regs->regs[15] = new_sp
169 /* Forward declaration, a strange C thing */
170 struct task_struct;
171 struct mm_struct;
173 /* Free all resources held by a thread. */
174 extern void release_thread(struct task_struct *);
176 /* Prepare to copy thread state - unlazy all lazy status */
177 #define prepare_to_copy(tsk) do { } while (0)
180 * create a kernel thread without removing it from tasklists
182 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
184 /* Copy and release all segment info associated with a VM */
185 #define copy_segments(p, mm) do { } while(0)
186 #define release_segments(mm) do { } while(0)
189 * FPU lazy state save handling.
192 static __inline__ void disable_fpu(void)
194 unsigned long __dummy;
196 /* Set FD flag in SR */
197 __asm__ __volatile__("stc sr, %0\n\t"
198 "or %1, %0\n\t"
199 "ldc %0, sr"
200 : "=&r" (__dummy)
201 : "r" (SR_FD));
204 static __inline__ void enable_fpu(void)
206 unsigned long __dummy;
208 /* Clear out FD flag in SR */
209 __asm__ __volatile__("stc sr, %0\n\t"
210 "and %1, %0\n\t"
211 "ldc %0, sr"
212 : "=&r" (__dummy)
213 : "r" (~SR_FD));
216 static __inline__ void release_fpu(struct pt_regs *regs)
218 regs->sr |= SR_FD;
221 static __inline__ void grab_fpu(struct pt_regs *regs)
223 regs->sr &= ~SR_FD;
226 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
228 #define unlazy_fpu(tsk, regs) do { \
229 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
230 save_fpu(tsk, regs); \
232 } while (0)
234 #define clear_fpu(tsk, regs) do { \
235 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
236 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
237 release_fpu(regs); \
239 } while (0)
241 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
242 #define FPSCR_INIT 0x00080000
244 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
245 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
248 * Return saved PC of a blocked thread.
250 #define thread_saved_pc(tsk) (tsk->thread.pc)
252 void show_trace(struct task_struct *tsk, unsigned long *sp,
253 struct pt_regs *regs);
254 extern unsigned long get_wchan(struct task_struct *p);
256 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
257 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
259 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
260 #define cpu_relax() barrier()
262 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
263 defined(CONFIG_CPU_SH4)
264 #define PREFETCH_STRIDE L1_CACHE_BYTES
265 #define ARCH_HAS_PREFETCH
266 #define ARCH_HAS_PREFETCHW
267 static inline void prefetch(void *x)
269 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
272 #define prefetchw(x) prefetch(x)
273 #endif
275 #ifdef CONFIG_VSYSCALL
276 extern int vsyscall_init(void);
277 #else
278 #define vsyscall_init() do { } while (0)
279 #endif
281 /* arch/sh/kernel/setup.c */
282 const char *get_cpu_subtype(struct sh_cpuinfo *c);
284 #endif /* __KERNEL__ */
285 #endif /* __ASM_SH_PROCESSOR_H */