| /* |
| * include/asm-sh/processor.h |
| * |
| * Copyright (C) 1999, 2000 Niibe Yutaka |
| */ |
| |
| #ifndef __ASM_SH_PROCESSOR_H |
| #define __ASM_SH_PROCESSOR_H |
| |
| #include <asm/page.h> |
| #include <asm/types.h> |
| #include <linux/threads.h> |
| |
| /* |
| * 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; }) |
| |
| /* |
| * CPU type and hardware bug flags. Kept separately for each CPU. |
| */ |
| enum cpu_type { |
| CPU_SH7708, /* Represents 7707, 7708, 7708S, 7708R, 7709 */ |
| CPU_SH7729, /* Represents 7709A, 7729 */ |
| CPU_SH7750, /* Represents 7750, 7751 */ |
| CPU_ST40, /* Represents ST40STB1 and ST40GX1 */ |
| CPU_SH4202, |
| 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_ST40 |
| unsigned int memory_clock; |
| #endif |
| }; |
| |
| extern struct sh_cpuinfo boot_cpu_data; |
| |
| #define cpu_data (&boot_cpu_data) |
| #define current_cpu_data boot_cpu_data |
| |
| /* |
| * 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; |
| }; |
| |
| struct thread_struct { |
| unsigned long sp; |
| unsigned long pc; |
| |
| unsigned long trap_no, error_code; |
| unsigned long address; |
| |
| /* Hardware debugging registers */ |
| unsigned long ubc_pc1, ubc_pc2; |
| |
| /* 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, -1, \ |
| {{{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 = 0; /* 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 *); |
| /* |
| * create a kernel thread without removing it from tasklists |
| */ |
| extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| |
| /* |
| * Bus types |
| */ |
| #define EISA_bus 0 |
| #define EISA_bus__is_a_macro /* for versions in ksyms.c */ |
| #define MCA_bus 0 |
| #define MCA_bus__is_a_macro /* for versions in ksyms.c */ |
| |
| |
| /* 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 release_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 grab_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)); |
| } |
| |
| extern void save_fpu(struct task_struct *__tsk); |
| |
| #define unlazy_fpu(tsk) do { \ |
| if ((tsk)->flags & PF_USEDFPU) { \ |
| save_fpu(tsk); \ |
| } \ |
| } while (0) |
| |
| #define clear_fpu(tsk) do { \ |
| if ((tsk)->flags & PF_USEDFPU) { \ |
| (tsk)->flags &= ~PF_USEDFPU; \ |
| release_fpu(); \ |
| } \ |
| } 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. |
| */ |
| static __inline__ unsigned long thread_saved_pc(struct thread_struct *t) |
| { |
| return t->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 THREAD_SIZE (2*PAGE_SIZE) |
| extern struct task_struct * alloc_task_struct(void); |
| extern void free_task_struct(struct task_struct *); |
| #define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count) |
| |
| #define init_task (init_task_union.task) |
| #define init_stack (init_task_union.stack) |
| |
| #define cpu_relax() do { } while (0) |
| |
| #endif /* __ASM_SH_PROCESSOR_H */ |