diff options
Diffstat (limited to 'arch/um/kernel/process_kern.c')
| -rw-r--r-- | arch/um/kernel/process_kern.c | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c new file mode 100644 index 00000000000..1d719d5b4bb --- /dev/null +++ b/arch/um/kernel/process_kern.c @@ -0,0 +1,500 @@ +/* + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright 2003 PathScale, Inc. + * Licensed under the GPL + */ + +#include "linux/config.h" +#include "linux/kernel.h" +#include "linux/sched.h" +#include "linux/interrupt.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 "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 "signal_user.h" +#include "init.h" +#include "irq_user.h" +#include "mem_user.h" +#include "time_user.h" +#include "tlb.h" +#include "frame_kern.h" +#include "sigcontext.h" +#include "2_5compat.h" +#include "os.h" +#include "mode.h" +#include "mode_kern.h" +#include "choose-mode.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 } }; + +struct task_struct *get_task(int pid, int require) +{ + struct task_struct *ret; + + read_lock(&tasklist_lock); + ret = find_task_by_pid(pid); + read_unlock(&tasklist_lock); + + if(require && (ret == NULL)) panic("get_task couldn't find a task\n"); + return(ret); +} + +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; + int 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, NULL, 0, NULL, + NULL); + if(pid < 0) + panic("do_fork failed in kernel_thread, errno = %d", pid); + return(pid); +} + +void switch_mm(struct mm_struct *prev, struct mm_struct *next, + struct task_struct *tsk) +{ + int cpu = smp_processor_id(); + + if (prev != next) + cpu_clear(cpu, prev->cpu_vm_mask); + cpu_set(cpu, next->cpu_vm_mask); +} + +void set_current(void *t) +{ + struct task_struct *task = t; + + cpu_tasks[task->thread_info->cpu] = ((struct cpu_task) + { external_pid(task), task }); +} + +void *_switch_to(void *prev, void *next, void *last) +{ + return(CHOOSE_MODE(switch_to_tt(prev, next), + switch_to_skas(prev, next))); +} + +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) +{ + CHOOSE_MODE(exit_thread_tt(), exit_thread_skas()); + unprotect_stack((unsigned long) current_thread); +} + +void *get_current(void) +{ + return(current); +} + +void prepare_to_copy(struct task_struct *tsk) +{ +} + +int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, + unsigned long stack_top, struct task_struct * p, + struct pt_regs *regs) +{ + p->thread = (struct thread_struct) INIT_THREAD; + return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr, + clone_flags, sp, stack_top, p, regs)); +} + +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) +{ + uml_idle_timer(); + + atomic_inc(&init_mm.mm_count); + current->mm = &init_mm; + current->active_mm = &init_mm; + + while(1){ + /* endless idle loop with no priority at all */ + SET_PRI(current); + + /* + * 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); +} + +unsigned long page_mask(void) +{ + return(PAGE_MASK); +} + +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; + + 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); + if(!pte_present(*pte)) + return(ERR_PTR(-EINVAL)); + + if(pte_out != NULL) + *pte_out = *pte; + return((void *) (pte_val(*pte) & 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(¤t->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)); +} + +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 void remove_umid_dir(void); + +__uml_exitcall(remove_umid_dir); + +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) +{ + char *new; + + new = kmalloc(strlen(string) + 1, GFP_KERNEL); + if(new == NULL) return(NULL); + strcpy(new, string); + return(new); +} + +void *get_init_task(void) +{ + return(&init_thread_union.thread_info.task); +} + +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 um_in_interrupt(void) +{ + return(in_interrupt()); +} + +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 *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("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; +} + +unsigned long arch_align_stack(unsigned long sp) +{ + if (randomize_va_space) + sp -= get_random_int() % 8192; + return sp & ~0xf; +} + + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |