litmus-rt.git - The LITMUS^RT kernel.

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author	David Howells <dhowells@redhat.com>	2007-04-26 18:55:48 -0400
committer	David S. Miller <davem@davemloft.net>	2007-04-26 18:55:48 -0400
commit	63b6be55e8b51cb718468794d343058e96c7462c (patch)
tree	83c06275ba6b7ca1ffbf8c2e52497d7bceed567c /include/asm-sh/percpu.h
parent	08e0e7c82eeadec6f4871a386b86bf0f0fbcb4eb (diff)

[AF_RXRPC]: Delete the old RxRPC code.

Delete the old RxRPC code as it's now no longer used. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Diffstat (limited to 'include/asm-sh/percpu.h')

0 files changed, 0 insertions, 0 deletions

/* * Copyright (C) 1995 Linus Torvalds * * Pentium III FXSR, SSE support * Gareth Hughes <gareth@valinux.com>, May 2000 * * X86-64 port * Andi Kleen. * * CPU hotplug support - ashok.raj@intel.com */ /* * This file handles the architecture-dependent parts of process handling.. */ #include <stdarg.h> #include <linux/stackprotector.h> #include <linux/cpu.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/elfcore.h> #include <linux/smp.h> #include <linux/slab.h> #include <linux/user.h> #include <linux/interrupt.h> #include <linux/utsname.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/ptrace.h> #include <linux/random.h> #include <linux/notifier.h> #include <linux/kprobes.h> #include <linux/kdebug.h> #include <linux/tick.h> #include <linux/prctl.h> #include <linux/uaccess.h> #include <linux/io.h> #include <linux/ftrace.h> #include <linux/dmi.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/processor.h> #include <asm/i387.h> #include <asm/mmu_context.h> #include <asm/prctl.h> #include <asm/desc.h> #include <asm/proto.h> #include <asm/ia32.h> #include <asm/idle.h> #include <asm/syscalls.h> #include <asm/ds.h> asmlinkage extern void ret_from_fork(void); DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task; EXPORT_PER_CPU_SYMBOL(current_task); DEFINE_PER_CPU(unsigned long, old_rsp); static DEFINE_PER_CPU(unsigned char, is_idle); unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED; static ATOMIC_NOTIFIER_HEAD(idle_notifier); void idle_notifier_register(struct notifier_block *n) { atomic_notifier_chain_register(&idle_notifier, n); } EXPORT_SYMBOL_GPL(idle_notifier_register); void idle_notifier_unregister(struct notifier_block *n) { atomic_notifier_chain_unregister(&idle_notifier, n); } EXPORT_SYMBOL_GPL(idle_notifier_unregister); void enter_idle(void) { percpu_write(is_idle, 1); atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL); } static void __exit_idle(void) { if (x86_test_and_clear_bit_percpu(0, is_idle) == 0) return; atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL); } /* Called from interrupts to signify idle end */ void exit_idle(void) { /* idle loop has pid 0 */ if (current->pid) return; __exit_idle(); } #ifndef CONFIG_SMP static inline void play_dead(void) { BUG(); } #endif /* * The idle thread. There's no useful work to be * done, so just try to conserve power and have a * low exit latency (ie sit in a loop waiting for * somebody to say that they'd like to reschedule) */ void cpu_idle(void) { current_thread_info()->status |= TS_POLLING; /* * If we're the non-boot CPU, nothing set the stack canary up * for us. CPU0 already has it initialized but no harm in * doing it again. This is a good place for updating it, as * we wont ever return from this function (so the invalid * canaries already on the stack wont ever trigger). */ boot_init_stack_canary(); /* endless idle loop with no priority at all */ while (1) { tick_nohz_stop_sched_tick(1); while (!need_resched()) { rmb(); if (cpu_is_offline(smp_processor_id())) play_dead(); /* * Idle routines should keep interrupts disabled * from here on, until they go to idle. * Otherwise, idle callbacks can misfire. */ local_irq_disable(); enter_idle(); /* Don't trace irqs off for idle */ stop_critical_timings(); pm_idle(); start_critical_timings(); /* In many cases the interrupt that ended idle has already called exit_idle. But some idle loops can be woken up without interrupt. */ __exit_idle(); } tick_nohz_restart_sched_tick(); preempt_enable_no_resched(); schedule(); preempt_disable(); } } /* Prints also some state that isn't saved in the pt_regs */ void __show_regs(struct pt_regs *regs, int all) { unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L, fs, gs, shadowgs; unsigned long d0, d1, d2, d3, d6, d7; unsigned int fsindex, gsindex; unsigned int ds, cs, es; const char *board; printk("\n"); print_modules(); board = dmi_get_system_info(DMI_PRODUCT_NAME); if (!board) board = ""; printk(KERN_INFO "Pid: %d, comm: %.20s %s %s %.*s %s\n", current->pid, current->comm, print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version, board); printk(KERN_INFO "RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->ip); printk_address(regs->ip, 1); printk(KERN_INFO "RSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss, regs->sp, regs->flags); printk(KERN_INFO "RAX: %016lx RBX: %016lx RCX: %016lx\n", regs->ax, regs->bx, regs->cx); printk(KERN_INFO "RDX: %016lx RSI: %016lx RDI: %016lx\n", regs->dx, regs->si, regs->di); printk(KERN_INFO "RBP: %016lx R08: %016lx R09: %016lx\n", regs->bp, regs->r8, regs->r9); printk(KERN_INFO "R10: %016lx R11: %016lx R12: %016lx\n", regs->r10, regs->r11, regs->r12); printk(KERN_INFO "R13: %016lx R14: %016lx R15: %016lx\n", regs->r13, regs->r14, regs->r15); asm("movl %%ds,%0" : "=r" (ds)); asm("movl %%cs,%0" : "=r" (cs)); asm("movl %%es,%0" : "=r" (es)); asm("movl %%fs,%0" : "=r" (fsindex)); asm("movl %%gs,%0" : "=r" (gsindex)); rdmsrl(MSR_FS_BASE, fs); rdmsrl(MSR_GS_BASE, gs); rdmsrl(MSR_KERNEL_GS_BASE, shadowgs); if (!all) return; cr0 = read_cr0(); cr2 = read_cr2(); cr3 = read_cr3(); cr4 = read_cr4(); printk(KERN_INFO "FS: %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n", fs, fsindex, gs, gsindex, shadowgs); printk(KERN_INFO "CS: %04x DS: %04x ES: %04x CR0: %016lx\n", cs, ds, es, cr0); printk(KERN_INFO "CR2: %016lx CR3: %016lx CR4: %016lx\n", cr2, cr3, cr4); get_debugreg(d0, 0); get_debugreg(d1, 1); get_debugreg(d2, 2); printk(KERN_INFO "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2); get_debugreg(d3, 3); get_debugreg(d6, 6); get_debugreg(d7, 7); printk(KERN_INFO "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7); } void show_regs(struct pt_regs *regs) { printk(KERN_INFO "CPU %d:", smp_processor_id()); __show_regs(regs, 1); show_trace(NULL, regs, (void *)(regs + 1), regs->bp); } void release_thread(struct task_struct *dead_task) { if (dead_task->mm) { if (dead_task->mm->context.size) { printk("WARNING: dead process %8s still has LDT? <%p/%d>\n", dead_task->comm, dead_task->mm->context.ldt, dead_task->mm->context.size); BUG(); } } } static inline void set_32bit_tls(struct task_struct *t, int tls, u32 addr) { struct user_desc ud = { .base_addr = addr, .limit = 0xfffff, .seg_32bit = 1, .limit_in_pages = 1, .useable = 1, }; struct desc_struct *desc = t->thread.tls_array; desc += tls; fill_ldt(desc, &ud); } static inline u32 read_32bit_tls(struct task_struct *t, int tls) { return get_desc_base(&t->thread.tls_array[tls]); } /* * This gets called before we allocate a new thread and copy * the current task into it. */ void prepare_to_copy(struct task_struct *tsk) { unlazy_fpu(tsk); } int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long unused, struct task_struct *p, struct pt_regs *regs) { int err; struct pt_regs *childregs; struct task_struct *me = current; childregs = ((struct pt_regs *) (THREAD_SIZE + task_stack_page(p))) - 1; *childregs = *regs; childregs->ax = 0; childregs->sp = sp; if (sp == ~0UL) childregs->sp = (unsigned long)childregs; p->thread.sp = (unsigned long) childregs; p->thread.sp0 = (unsigned long) (childregs+1); p->thread.usersp = me->thread.usersp; set_tsk_thread_flag(p, TIF_FORK); p->thread.fs = me->thread.fs; p->thread.gs = me->thread.gs; savesegment(gs, p->thread.gsindex); savesegment(fs, p->thread.fsindex); savesegment(es, p->thread.es); savesegment(ds, p->thread.ds); if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL); if (!p->thread.io_bitmap_ptr) { p->thread.io_bitmap_max = 0; return -ENOMEM; } memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr, IO_BITMAP_BYTES); set_tsk_thread_flag(p, TIF_IO_BITMAP); } /* * Set a new TLS for the child thread? */ if (clone_flags & CLONE_SETTLS) { #ifdef CONFIG_IA32_EMULATION if (test_thread_flag(TIF_IA32)) err = do_set_thread_area(p, -1, (struct user_desc __user *)childregs->si, 0); else #endif err = do_arch_prctl(p, ARCH_SET_FS, childregs->r8); if (err) goto out; } ds_copy_thread(p, me); clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR); p->thread.debugctlmsr = 0; err = 0; out: if (err && p->thread.io_bitmap_ptr) { kfree(p->thread.io_bitmap_ptr); p->thread.io_bitmap_max = 0; } return err; } void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) { loadsegment(fs, 0); loadsegment(es, 0); loadsegment(ds, 0); load_gs_index(0); regs->ip = new_ip; regs->sp = new_sp; percpu_write(old_rsp, new_sp); regs->cs = __USER_CS; regs->ss = __USER_DS; regs->flags = 0x200; set_fs(USER_DS); /* * Free the old FP and other extended state */ free_thread_xstate(current); } EXPORT_SYMBOL_GPL(start_thread); /* * switch_to(x,y) should switch tasks from x to y. * * This could still be optimized: * - fold all the options into a flag word and test it with a single test. * - could test fs/gs bitsliced * * Kprobes not supported here. Set the probe on schedule instead. * Function graph tracer not supported too. */ __notrace_funcgraph struct task_struct * __switch_to(struct task_struct *prev_p, struct task_struct *next_p) { struct thread_struct *prev = &prev_p->thread; struct thread_struct *next = &next_p->thread; int cpu = smp_processor_id(); struct tss_struct *tss = &per_cpu(init_tss, cpu); unsigned fsindex, gsindex; /* we're going to use this soon, after a few expensive things */ if (next_p->fpu_counter > 5) prefetch(next->xstate); /* * Reload esp0, LDT and the page table pointer: */ load_sp0(tss, next); /* * Switch DS and ES. * This won't pick up thread selector changes, but I guess that is ok. */ savesegment(es, prev->es); if (unlikely(next->es | prev->es)) loadsegment(es, next->es); savesegment(ds, prev->ds); if (unlikely(next->ds | prev->ds)) loadsegment(ds, next->ds); /* We must save %fs and %gs before load_TLS() because * %fs and %gs may be cleared by load_TLS(). * * (e.g. xen_load_tls()) */ savesegment(fs, fsindex); savesegment(gs, gsindex); load_TLS(next, cpu); /* * Leave lazy mode, flushing any hypercalls made here. * This must be done before restoring TLS segments so * the GDT and LDT are properly updated, and must be * done before math_state_restore, so the TS bit is up * to date. */ arch_end_context_switch(next_p); /* * Switch FS and GS. * * Segment register != 0 always requires a reload. Also * reload when it has changed. When prev process used 64bit * base always reload to avoid an information leak. */ if (unlikely(fsindex | next->fsindex | prev->fs)) { loadsegment(fs, next->fsindex); /* * Check if the user used a selector != 0; if yes * clear 64bit base, since overloaded base is always * mapped to the Null selector */ if (fsindex) prev->fs = 0; } /* when next process has a 64bit base use it */ if (next->fs) wrmsrl(MSR_FS_BASE, next->fs); prev->fsindex = fsindex; if (unlikely(gsindex | next->gsindex | prev->gs)) { load_gs_index(next->gsindex); if (gsindex) prev->gs = 0; } if (next->gs) wrmsrl(MSR_KERNEL_GS_BASE, next->gs); prev->gsindex = gsindex; /* Must be after DS reload */ unlazy_fpu(prev_p); /* * Switch the PDA and FPU contexts. */ prev->usersp = percpu_read(old_rsp); percpu_write(old_rsp, next->usersp); percpu_write(current_task, next_p); percpu_write(kernel_stack, (unsigned long)task_stack_page(next_p) + THREAD_SIZE - KERNEL_STACK_OFFSET); /* * Now maybe reload the debug registers and handle I/O bitmaps */ if (unlikely(task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT || task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV)) __switch_to_xtra(prev_p, next_p, tss); /* If the task has used fpu the last 5 timeslices, just do a full * restore of the math state immediately to avoid the trap; the * chances of needing FPU soon are obviously high now * * tsk_used_math() checks prevent calling math_state_restore(), * which can sleep in the case of !tsk_used_math() */ if (tsk_used_math(next_p) && next_p->fpu_counter > 5) math_state_restore(); return prev_p; } /* * sys_execve() executes a new program. */ asmlinkage long sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp, struct pt_regs *regs) { long error; char *filename; filename = getname(name); error = PTR_ERR(filename); if (IS_ERR(filename)) return error; error = do_execve(filename, argv, envp, regs); putname(filename); return error; } void set_personality_64bit(void) { /* inherit personality from parent */ /* Make sure to be in 64bit mode */ clear_thread_flag(TIF_IA32); /* TBD: overwrites user setup. Should have two bits. But 64bit processes have always behaved this way, so it's not too bad. The main problem is just that 32bit childs are affected again. */ current->personality &= ~READ_IMPLIES_EXEC; } asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp, void __user *parent_tid, void __user *child_tid, struct pt_regs *regs) { if (!newsp) newsp = regs->sp; return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid); }


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