/* MN10300 Processor specifics * * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #ifndef _ASM_PROCESSOR_H #define _ASM_PROCESSOR_H #include <asm/page.h> #include <asm/ptrace.h> #include <asm/cpu-regs.h> #include <linux/threads.h> /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() \ ({ \ void *__pc; \ asm("mov pc,%0" : "=a"(__pc)); \ __pc; \ }) extern void show_registers(struct pt_regs *regs); /* * CPU type and hardware bug flags. Kept separately for each CPU. * Members of this structure are referenced in head.S, so think twice * before touching them. [mj] */ struct mn10300_cpuinfo { int type; unsigned long loops_per_sec; char hard_math; unsigned long *pgd_quick; unsigned long *pte_quick; unsigned long pgtable_cache_sz; }; extern struct mn10300_cpuinfo boot_cpu_data; #define cpu_data &boot_cpu_data #define current_cpu_data boot_cpu_data extern void identify_cpu(struct mn10300_cpuinfo *); extern void print_cpu_info(struct mn10300_cpuinfo *); extern void dodgy_tsc(void); #define cpu_relax() barrier() /* * User space process size: 1.75GB (default). */ #define TASK_SIZE 0x70000000 /* * Where to put the userspace stack by default */ #define STACK_TOP 0x70000000 #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 0x30000000 typedef struct { unsigned long seg; } mm_segment_t; struct fpu_state_struct { unsigned long fs[32]; /* fpu registers */ unsigned long fpcr; /* fpu control register */ }; struct thread_struct { struct pt_regs *uregs; /* userspace register frame */ unsigned long pc; /* kernel PC */ unsigned long sp; /* kernel SP */ unsigned long a3; /* kernel FP */ unsigned long wchan; unsigned long usp; struct pt_regs *__frame; unsigned long fpu_flags; #define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */ struct fpu_state_struct fpu_state; }; #define INIT_THREAD \ { \ .uregs = init_uregs, \ .pc = 0, \ .sp = 0, \ .a3 = 0, \ .wchan = 0, \ .__frame = NULL, \ } #define INIT_MMAP \ { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \ NULL, NULL } /* * do necessary setup to start up a newly executed thread * - need to discard the frame stacked by the kernel thread invoking the execve * syscall (see RESTORE_ALL macro) */ #define start_thread(regs, new_pc, new_sp) do { \ set_fs(USER_DS); \ __frame = current->thread.uregs; \ __frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; \ __frame->pc = new_pc; \ __frame->sp = new_sp; \ } while (0) /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* Prepare to copy thread state - unlazy all lazy status */ extern void prepare_to_copy(struct task_struct *tsk); /* * create a kernel thread without removing it from tasklists */ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); /* * Return saved PC of a blocked thread. */ extern unsigned long thread_saved_pc(struct task_struct *tsk); unsigned long get_wchan(struct task_struct *p); #define task_pt_regs(task) \ ({ \ struct pt_regs *__regs__; \ __regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \ __regs__ - 1; \ }) #define KSTK_EIP(task) (task_pt_regs(task)->pc) #define KSTK_ESP(task) (task_pt_regs(task)->sp) #define KSTK_TOP(info) \ ({ \ (unsigned long)(info) + THREAD_SIZE; \ }) #define ARCH_HAS_PREFETCH #define ARCH_HAS_PREFETCHW static inline void prefetch(const void *x) { #ifndef CONFIG_MN10300_CACHE_DISABLED #ifdef CONFIG_MN10300_PROC_MN103E010 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); #else asm volatile ("dcpf (%0)" : : "r"(x)); #endif #endif } static inline void prefetchw(const void *x) { #ifndef CONFIG_MN10300_CACHE_DISABLED #ifdef CONFIG_MN10300_PROC_MN103E010 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); #else asm volatile ("dcpf (%0)" : : "r"(x)); #endif #endif } #endif /* _ASM_PROCESSOR_H */