/* * include/asm-sh/processor.h * * Copyright (C) 1999, 2000 Niibe Yutaka * Copyright (C) 2002, 2003 Paul Mundt */ #ifndef __ASM_SH_PROCESSOR_H #define __ASM_SH_PROCESSOR_H #ifdef __KERNEL__ #include #include #include #include #include /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; }) /* Core Processor Version Register */ #define CCN_PVR 0xff000030 #define CCN_CVR 0xff000040 #define CCN_PRR 0xff000044 /* * CPU type and hardware bug flags. Kept separately for each CPU. * * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry * in arch/sh/Kconfig, as well as an entry in arch/sh/kernel/setup.c * for parsing the subtype in get_cpu_subtype(). */ enum cpu_type { /* SH-2 types */ CPU_SH7604, /* SH-3 types */ CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R, CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300, /* SH-4 types */ CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R, CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501, CPU_SH73180, /* Unknown subtype */ CPU_SH_NONE }; struct sh_cpuinfo { enum cpu_type type; char hard_math; unsigned long loops_per_jiffy; unsigned int cpu_clock, master_clock, bus_clock, module_clock; #ifdef CONFIG_CPU_SUBTYPE_ST40STB1 unsigned int memory_clock; #endif struct cache_info icache; struct cache_info dcache; unsigned long flags; }; extern struct sh_cpuinfo boot_cpu_data; #ifdef CONFIG_SMP extern struct sh_cpuinfo cpu_data[]; #define current_cpu_data cpu_data[smp_processor_id()] #else #define cpu_data (&boot_cpu_data) #define current_cpu_data boot_cpu_data #endif /* * User space process size: 2GB. * * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff */ #define TASK_SIZE 0x7c000000UL /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) /* * Bit of SR register * * FD-bit: * When it's set, it means the processor doesn't have right to use FPU, * and it results exception when the floating operation is executed. * * IMASK-bit: * Interrupt level mask */ #define SR_FD 0x00008000 #define SR_DSP 0x00001000 #define SR_IMASK 0x000000f0 /* * FPU structure and data */ struct sh_fpu_hard_struct { unsigned long fp_regs[16]; unsigned long xfp_regs[16]; unsigned long fpscr; unsigned long fpul; long status; /* software status information */ }; /* Dummy fpu emulator */ struct sh_fpu_soft_struct { unsigned long fp_regs[16]; unsigned long xfp_regs[16]; unsigned long fpscr; unsigned long fpul; unsigned char lookahead; unsigned long entry_pc; }; union sh_fpu_union { struct sh_fpu_hard_struct hard; struct sh_fpu_soft_struct soft; }; /* * Processor flags */ #define CPU_HAS_FPU 0x0001 /* Hardware FPU support */ #define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */ #define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */ #define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */ #define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */ struct thread_struct { unsigned long sp; unsigned long pc; unsigned long trap_no, error_code; unsigned long address; /* Hardware debugging registers may come here */ unsigned long ubc_pc; /* floating point info */ union sh_fpu_union fpu; }; /* Count of active tasks with UBC settings */ extern int ubc_usercnt; #define INIT_THREAD { \ sizeof(init_stack) + (long) &init_stack, /* sp */ \ 0, /* pc */ \ 0, 0, \ 0, \ 0, \ {{{0,}},} /* fpu state */ \ } /* * Do necessary setup to start up a newly executed thread. */ #define start_thread(regs, new_pc, new_sp) \ set_fs(USER_DS); \ regs->pr = 0; \ regs->sr = SR_FD; /* User mode. */ \ regs->pc = new_pc; \ regs->regs[15] = new_sp /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) /* * create a kernel thread without removing it from tasklists */ extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); /* Copy and release all segment info associated with a VM */ #define copy_segments(p, mm) do { } while(0) #define release_segments(mm) do { } while(0) /* * FPU lazy state save handling. */ static __inline__ void disable_fpu(void) { unsigned long __dummy; /* Set FD flag in SR */ __asm__ __volatile__("stc sr, %0\n\t" "or %1, %0\n\t" "ldc %0, sr" : "=&r" (__dummy) : "r" (SR_FD)); } static __inline__ void enable_fpu(void) { unsigned long __dummy; /* Clear out FD flag in SR */ __asm__ __volatile__("stc sr, %0\n\t" "and %1, %0\n\t" "ldc %0, sr" : "=&r" (__dummy) : "r" (~SR_FD)); } static __inline__ void release_fpu(struct pt_regs *regs) { regs->sr |= SR_FD; } static __inline__ void grab_fpu(struct pt_regs *regs) { regs->sr &= ~SR_FD; } #ifdef CONFIG_CPU_SH4 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs); #else #define save_fpu(tsk) do { } while (0) #endif #define unlazy_fpu(tsk, regs) do { \ if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ save_fpu(tsk, regs); \ } \ } while (0) #define clear_fpu(tsk, regs) do { \ if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ clear_tsk_thread_flag(tsk, TIF_USEDFPU); \ release_fpu(regs); \ } \ } while (0) /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ #define FPSCR_INIT 0x00080000 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ /* * Return saved PC of a blocked thread. */ #define thread_saved_pc(tsk) (tsk->thread.pc) extern unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) ((tsk)->thread.pc) #define KSTK_ESP(tsk) ((tsk)->thread.sp) #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory") #define cpu_relax() do { } while (0) #endif /* __KERNEL__ */ #endif /* __ASM_SH_PROCESSOR_H */