/* * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Copyright 2003 PathScale, Inc. * Licensed under the GPL */ #include "linux/kernel.h"#include "linux/sched.h"#include "linux/interrupt.h"#include "linux/string.h"#include "linux/mm.h"#include "linux/slab.h"#include "linux/utsname.h"#include "linux/fs.h"#include "linux/utime.h"#include "linux/smp_lock.h"#include "linux/module.h"#include "linux/init.h"#include "linux/capability.h"#include "linux/vmalloc.h"#include "linux/spinlock.h"#include "linux/proc_fs.h"#include "linux/ptrace.h"#include "linux/random.h"#include "linux/personality.h"#include "asm/unistd.h"#include "asm/mman.h"#include "asm/segment.h"#include "asm/stat.h"#include "asm/pgtable.h"#include "asm/processor.h"#include "asm/tlbflush.h"#include "asm/uaccess.h"#include "asm/user.h"#include "user_util.h"#include "kern_util.h"#include "kern.h"#include "signal_kern.h"#include "init.h"#include "irq_user.h"#include "mem_user.h"#include "tlb.h"#include "frame_kern.h"#include "sigcontext.h"#include "os.h"#include "mode.h"#include "mode_kern.h"#include "choose-mode.h"#include "um_malloc.h" /* This is a per-cpu array.  A processor only modifies its entry and it only * cares about its entry, so it's OK if another processor is modifying its * entry. */struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; int external_pid(void *t){	struct task_struct *task = t ? t : current; 	return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));} int pid_to_processor_id(int pid){	int i; 	for(i = 0; i < ncpus; i++){		if(cpu_tasks[i].pid == pid) return(i);	}	return(-1);} void free_stack(unsigned long stack, int order){	free_pages(stack, order);} unsigned long alloc_stack(int order, int atomic){	unsigned long page;	gfp_t flags = GFP_KERNEL; 	if (atomic)		flags = GFP_ATOMIC;	page = __get_free_pages(flags, order);	if(page == 0)		return(0);	stack_protections(page);	return(page);} int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags){	int pid; 	current->thread.request.u.thread.proc = fn;	current->thread.request.u.thread.arg = arg;	pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,		      &current->thread.regs, 0, NULL, NULL);	if(pid < 0)		panic("do_fork failed in kernel_thread, errno = %d", pid);	return(pid);} void set_current(void *t){	struct task_struct *task = t; 	cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)		{ external_pid(task), task });} void *_switch_to(void *prev, void *next, void *last){	struct task_struct *from = prev;	struct task_struct *to= next; 	to->thread.prev_sched = from;	set_current(to); 	do {		current->thread.saved_task = NULL ;		CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next);		if(current->thread.saved_task)			show_regs(&(current->thread.regs));		next= current->thread.saved_task;		prev= current;	} while(current->thread.saved_task); 	return(current->thread.prev_sched); } void interrupt_end(void){	if(need_resched()) schedule();	if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();} void release_thread(struct task_struct *task){	CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));} void exit_thread(void){	unprotect_stack((unsigned long) current_thread);} void *get_current(void){	return(current);} int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,		unsigned long stack_top, struct task_struct * p,		struct pt_regs *regs){	int ret; 	p->thread = (struct thread_struct) INIT_THREAD;	ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,				clone_flags, sp, stack_top, p, regs); 	if (ret || !current->thread.forking)		goto out; 	clear_flushed_tls(p); 	/*	 * Set a new TLS for the child thread?	 */	if (clone_flags & CLONE_SETTLS)		ret = arch_copy_tls(p); out:	return ret;} void initial_thread_cb(void (*proc)(void *), void *arg){	int save_kmalloc_ok = kmalloc_ok; 	kmalloc_ok = 0;	CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,			 arg);	kmalloc_ok = save_kmalloc_ok;} unsigned long stack_sp(unsigned long page){	return(page + PAGE_SIZE - sizeof(void *));} int current_pid(void){	return(current->pid);} void default_idle(void){	CHOOSE_MODE(uml_idle_timer(), (void) 0); 	while(1){		/* endless idle loop with no priority at all */ 		/*		 * although we are an idle CPU, we do not want to		 * get into the scheduler unnecessarily.		 */		if(need_resched())			schedule(); 		idle_sleep(10);	}} void cpu_idle(void){	CHOOSE_MODE(init_idle_tt(), init_idle_skas());} int page_size(void){	return(PAGE_SIZE);} void *um_virt_to_phys(struct task_struct *task, unsigned long addr,		      pte_t *pte_out){	pgd_t *pgd;	pud_t *pud;	pmd_t *pmd;	pte_t *pte;	pte_t ptent; 	if(task->mm == NULL)		return(ERR_PTR(-EINVAL));	pgd = pgd_offset(task->mm, addr);	if(!pgd_present(*pgd))		return(ERR_PTR(-EINVAL)); 	pud = pud_offset(pgd, addr);	if(!pud_present(*pud))		return(ERR_PTR(-EINVAL)); 	pmd = pmd_offset(pud, addr);	if(!pmd_present(*pmd))		return(ERR_PTR(-EINVAL)); 	pte = pte_offset_kernel(pmd, addr);	ptent = *pte;	if(!pte_present(ptent))		return(ERR_PTR(-EINVAL)); 	if(pte_out != NULL)		*pte_out = ptent;	return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));} char *current_cmd(void){#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)	return("(Unknown)");#else	void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);	return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);#endif} void force_sigbus(void){	printk(KERN_ERR "Killing pid %d because of a lack of memory\n",	       current->pid);	lock_kernel();	sigaddset(&current->pending.signal, SIGBUS);	recalc_sigpending();	current->flags |= PF_SIGNALED;	do_exit(SIGBUS | 0x80);} void dump_thread(struct pt_regs *regs, struct user *u){} void enable_hlt(void){	panic("enable_hlt");} EXPORT_SYMBOL(enable_hlt); void disable_hlt(void){	panic("disable_hlt");} EXPORT_SYMBOL(disable_hlt); void *um_kmalloc(int size){	return kmalloc(size, GFP_KERNEL);} void *um_kmalloc_atomic(int size){	return kmalloc(size, GFP_ATOMIC);} void *um_vmalloc(int size){	return vmalloc(size);} void *um_vmalloc_atomic(int size){	return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL);} int __cant_sleep(void) {	return in_atomic() || irqs_disabled() || in_interrupt();	/* Is in_interrupt() really needed? */} unsigned long get_fault_addr(void){	return((unsigned long) current->thread.fault_addr);} EXPORT_SYMBOL(get_fault_addr); void not_implemented(void){	printk(KERN_DEBUG "Something isn't implemented in here\n");} EXPORT_SYMBOL(not_implemented); int user_context(unsigned long sp){	unsigned long stack; 	stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);	return(stack != (unsigned long) current_thread);} extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; void do_uml_exitcalls(void){	exitcall_t *call; 	call = &__uml_exitcall_end;	while (--call >= &__uml_exitcall_begin)		(*call)();} char *uml_strdup(char *string){	return kstrdup(string, GFP_KERNEL);} int copy_to_user_proc(void __user *to, void *from, int size){	return(copy_to_user(to, from, size));} int copy_from_user_proc(void *to, void __user *from, int size){	return(copy_from_user(to, from, size));} int clear_user_proc(void __user *buf, int size){	return(clear_user(buf, size));} int strlen_user_proc(char __user *str){	return(strlen_user(str));} int smp_sigio_handler(void){#ifdef CONFIG_SMP	int cpu = current_thread->cpu;	IPI_handler(cpu);	if(cpu != 0)		return(1);#endif	return(0);} int cpu(void){	return(current_thread->cpu);} static atomic_t using_sysemu = ATOMIC_INIT(0);int sysemu_supported; void set_using_sysemu(int value){	if (value > sysemu_supported)		return;	atomic_set(&using_sysemu, value);} int get_using_sysemu(void){	return atomic_read(&using_sysemu);} static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data){	if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/		*eof = 1; 	return strlen(buf);} static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data){	char tmp[2]; 	if (copy_from_user(tmp, buf, 1))		return -EFAULT; 	if (tmp[0] >= '0' && tmp[0] <= '2')		set_using_sysemu(tmp[0] - '0');	return count; /*We use the first char, but pretend to write everything*/} int __init make_proc_sysemu(void){	struct proc_dir_entry *ent;	if (!sysemu_supported)		return 0; 	ent = create_proc_entry("sysemu", 0600, &proc_root); 	if (ent == NULL)	{		printk(KERN_WARNING "Failed to register /proc/sysemu\n");		return(0);	} 	ent->read_proc  = proc_read_sysemu;	ent->write_proc = proc_write_sysemu; 	return 0;} late_initcall(make_proc_sysemu); int singlestepping(void * t){	struct task_struct *task = t ? t : current; 	if ( ! (task->ptrace & PT_DTRACE) )		return(0); 	if (task->thread.singlestep_syscall)		return(1); 	return 2;} /* * Only x86 and x86_64 have an arch_align_stack(). * All other arches have "#define arch_align_stack(x) (x)" * in their asm/system.h * As this is included in UML from asm-um/system-generic.h, * we can use it to behave as the subarch does. */#ifndef arch_align_stackunsigned long arch_align_stack(unsigned long sp){	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)		sp -= get_random_int() % 8192;	return sp & ~0xf;}#endif