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_H
9 #define __ASM_SH_PROCESSOR_H
13 #include <asm/types.h>
14 #include <asm/cache.h>
15 #include <linux/threads.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
30 * CPU type and hardware bug flags. Kept separately for each CPU.
32 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
33 * in arch/sh/Kconfig, as well as an entry in arch/sh/kernel/setup.c
34 * for parsing the subtype in get_cpu_subtype().
41 CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
42 CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300,
45 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
46 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
56 unsigned long loops_per_jiffy;
58 unsigned int cpu_clock, master_clock, bus_clock, module_clock;
59 #ifdef CONFIG_CPU_SUBTYPE_ST40STB1
60 unsigned int memory_clock;
63 struct cache_info icache;
64 struct cache_info dcache;
69 extern struct sh_cpuinfo boot_cpu_data;
72 extern struct sh_cpuinfo cpu_data[];
73 #define current_cpu_data cpu_data[smp_processor_id()]
75 #define cpu_data (&boot_cpu_data)
76 #define current_cpu_data boot_cpu_data
80 * User space process size: 2GB.
82 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
84 #define TASK_SIZE 0x7c000000UL
86 /* This decides where the kernel will search for a free chunk of vm
87 * space during mmap's.
89 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
95 * When it's set, it means the processor doesn't have right to use FPU,
96 * and it results exception when the floating operation is executed.
99 * Interrupt level mask
101 #define SR_FD 0x00008000
102 #define SR_DSP 0x00001000
103 #define SR_IMASK 0x000000f0
106 * FPU structure and data
109 struct sh_fpu_hard_struct {
110 unsigned long fp_regs[16];
111 unsigned long xfp_regs[16];
115 long status; /* software status information */
118 /* Dummy fpu emulator */
119 struct sh_fpu_soft_struct {
120 unsigned long fp_regs[16];
121 unsigned long xfp_regs[16];
125 unsigned char lookahead;
126 unsigned long entry_pc;
130 struct sh_fpu_hard_struct hard;
131 struct sh_fpu_soft_struct soft;
138 #define CPU_HAS_FPU 0x0001 /* Hardware FPU support */
139 #define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */
140 #define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */
141 #define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */
142 #define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */
144 struct thread_struct {
148 unsigned long trap_no, error_code;
149 unsigned long address;
150 /* Hardware debugging registers may come here */
151 unsigned long ubc_pc;
153 /* floating point info */
154 union sh_fpu_union fpu;
157 /* Count of active tasks with UBC settings */
158 extern int ubc_usercnt;
160 #define INIT_THREAD { \
161 sizeof(init_stack) + (long) &init_stack, /* sp */ \
166 {{{0,}},} /* fpu state */ \
170 * Do necessary setup to start up a newly executed thread.
172 #define start_thread(regs, new_pc, new_sp) \
175 regs->sr = SR_FD; /* User mode. */ \
177 regs->regs[15] = new_sp
179 /* Forward declaration, a strange C thing */
183 /* Free all resources held by a thread. */
184 extern void release_thread(struct task_struct *);
186 /* Prepare to copy thread state - unlazy all lazy status */
187 #define prepare_to_copy(tsk) do { } while (0)
190 * create a kernel thread without removing it from tasklists
192 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
194 /* Copy and release all segment info associated with a VM */
195 #define copy_segments(p, mm) do { } while(0)
196 #define release_segments(mm) do { } while(0)
199 * FPU lazy state save handling.
202 static __inline__ void disable_fpu(void)
204 unsigned long __dummy;
206 /* Set FD flag in SR */
207 __asm__ __volatile__("stc sr, %0\n\t"
214 static __inline__ void enable_fpu(void)
216 unsigned long __dummy;
218 /* Clear out FD flag in SR */
219 __asm__ __volatile__("stc sr, %0\n\t"
226 static __inline__ void release_fpu(struct pt_regs *regs)
231 static __inline__ void grab_fpu(struct pt_regs *regs)
236 #ifdef CONFIG_CPU_SH4
237 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
239 #define save_fpu(tsk) do { } while (0)
242 #define unlazy_fpu(tsk, regs) do { \
243 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
244 save_fpu(tsk, regs); \
248 #define clear_fpu(tsk, regs) do { \
249 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
250 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
255 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
256 #define FPSCR_INIT 0x00080000
258 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
259 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
262 * Return saved PC of a blocked thread.
264 #define thread_saved_pc(tsk) (tsk->thread.pc)
266 extern unsigned long get_wchan(struct task_struct *p);
268 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
269 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
271 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
272 #define cpu_relax() do { } while (0)
274 #endif /* __KERNEL__ */
275 #endif /* __ASM_SH_PROCESSOR_H */