| /* |
| * include/asm-sh/processor.h |
| * |
| * Copyright (C) 1999, 2000 Niibe Yutaka |
| * Copyright (C) 2002, 2003 Paul Mundt |
| */ |
| |
| #ifndef __ASM_SH_PROCESSOR_32_H |
| #define __ASM_SH_PROCESSOR_32_H |
| #ifdef __KERNEL__ |
| |
| #include <linux/compiler.h> |
| #include <linux/linkage.h> |
| #include <asm/page.h> |
| #include <asm/types.h> |
| #include <asm/ptrace.h> |
| |
| /* |
| * Default implementation of macro that returns current |
| * instruction pointer ("program counter"). |
| */ |
| #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; }) |
| |
| /* Core Processor Version Register */ |
| #define CCN_PVR 0xff000030 |
| #define CCN_CVR 0xff000040 |
| #define CCN_PRR 0xff000044 |
| |
| asmlinkage void __init sh_cpu_init(void); |
| |
| /* |
| * User space process size: 2GB. |
| * |
| * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff |
| */ |
| #define TASK_SIZE 0x7c000000UL |
| |
| #define STACK_TOP TASK_SIZE |
| #define STACK_TOP_MAX STACK_TOP |
| |
| /* 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_DSP 0x00001000 |
| #define SR_IMASK 0x000000f0 |
| #define SR_FD 0x00008000 |
| |
| /* |
| * 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; |
| }; |
| |
| struct thread_struct { |
| /* Saved registers when thread is descheduled */ |
| unsigned long sp; |
| unsigned long pc; |
| |
| /* Hardware debugging registers */ |
| 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 { \ |
| .sp = sizeof(init_stack) + (long) &init_stack, \ |
| } |
| |
| /* |
| * 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)); |
| } |
| |
| /* 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) |
| |
| void show_trace(struct task_struct *tsk, unsigned long *sp, |
| struct pt_regs *regs); |
| |
| #ifdef CONFIG_DUMP_CODE |
| void show_code(struct pt_regs *regs); |
| #else |
| static inline void show_code(struct pt_regs *regs) |
| { |
| } |
| #endif |
| |
| extern unsigned long get_wchan(struct task_struct *p); |
| |
| #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
| #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) |
| |
| #define user_stack_pointer(regs) ((regs)->regs[15]) |
| |
| #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \ |
| defined(CONFIG_CPU_SH4) |
| #define PREFETCH_STRIDE L1_CACHE_BYTES |
| #define ARCH_HAS_PREFETCH |
| #define ARCH_HAS_PREFETCHW |
| static inline void prefetch(void *x) |
| { |
| __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory"); |
| } |
| |
| #define prefetchw(x) prefetch(x) |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| #endif /* __ASM_SH_PROCESSOR_32_H */ |