mirror of
https://github.com/edk2-porting/linux-next.git
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602cc24181
timer_irq_inited was useless, so it is removed. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
226 lines
4.6 KiB
C
226 lines
4.6 KiB
C
/*
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* Copyright (C) 2004 PathScale, Inc
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* Licensed under the GPL
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/mman.h>
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#include "user_util.h"
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#include "user.h"
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#include "signal_kern.h"
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#include "sysdep/sigcontext.h"
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#include "sigcontext.h"
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#include "mode.h"
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#include "os.h"
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/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
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* together under SIGVTALRM_BIT. SIGPROF is excluded because we want to
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* be able to profile all of UML, not just the non-critical sections. If
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* profiling is not thread-safe, then that is not my problem. We can disable
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* profiling when SMP is enabled in that case.
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*/
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#define SIGIO_BIT 0
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#define SIGIO_MASK (1 << SIGIO_BIT)
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#define SIGVTALRM_BIT 1
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#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
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#define SIGALRM_BIT 2
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#define SIGALRM_MASK (1 << SIGALRM_BIT)
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static int signals_enabled = 1;
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static int pending = 0;
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void sig_handler(int sig, struct sigcontext *sc)
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{
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int enabled;
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enabled = signals_enabled;
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if(!enabled && (sig == SIGIO)){
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pending |= SIGIO_MASK;
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return;
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}
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block_signals();
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CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
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sig, sc);
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set_signals(enabled);
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}
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static void real_alarm_handler(int sig, struct sigcontext *sc)
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{
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if(sig == SIGALRM)
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switch_timers(0);
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CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
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sig, sc);
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if(sig == SIGALRM)
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switch_timers(1);
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}
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void alarm_handler(int sig, struct sigcontext *sc)
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{
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int enabled;
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enabled = signals_enabled;
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if(!signals_enabled){
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if(sig == SIGVTALRM)
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pending |= SIGVTALRM_MASK;
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else pending |= SIGALRM_MASK;
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return;
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}
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block_signals();
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real_alarm_handler(sig, sc);
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set_signals(enabled);
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}
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void set_sigstack(void *sig_stack, int size)
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{
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stack_t stack = ((stack_t) { .ss_flags = 0,
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.ss_sp = (__ptr_t) sig_stack,
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.ss_size = size - sizeof(void *) });
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if(sigaltstack(&stack, NULL) != 0)
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panic("enabling signal stack failed, errno = %d\n", errno);
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}
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void remove_sigstack(void)
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{
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stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
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.ss_sp = NULL,
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.ss_size = 0 });
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if(sigaltstack(&stack, NULL) != 0)
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panic("disabling signal stack failed, errno = %d\n", errno);
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}
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void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
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extern void hard_handler(int sig);
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void set_handler(int sig, void (*handler)(int), int flags, ...)
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{
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struct sigaction action;
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va_list ap;
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sigset_t sig_mask;
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int mask;
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handlers[sig] = (void (*)(int, struct sigcontext *)) handler;
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action.sa_handler = hard_handler;
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sigemptyset(&action.sa_mask);
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va_start(ap, flags);
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while((mask = va_arg(ap, int)) != -1)
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sigaddset(&action.sa_mask, mask);
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va_end(ap);
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action.sa_flags = flags;
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action.sa_restorer = NULL;
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if(sigaction(sig, &action, NULL) < 0)
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panic("sigaction failed - errno = %d\n", errno);
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sigemptyset(&sig_mask);
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sigaddset(&sig_mask, sig);
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if(sigprocmask(SIG_UNBLOCK, &sig_mask, NULL) < 0)
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panic("sigprocmask failed - errno = %d\n", errno);
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}
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int change_sig(int signal, int on)
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{
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sigset_t sigset, old;
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sigemptyset(&sigset);
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sigaddset(&sigset, signal);
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sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
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return(!sigismember(&old, signal));
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}
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void block_signals(void)
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{
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signals_enabled = 0;
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}
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void unblock_signals(void)
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{
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int save_pending;
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if(signals_enabled == 1)
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return;
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/* We loop because the IRQ handler returns with interrupts off. So,
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* interrupts may have arrived and we need to re-enable them and
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* recheck pending.
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*/
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while(1){
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/* Save and reset save_pending after enabling signals. This
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* way, pending won't be changed while we're reading it.
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*/
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signals_enabled = 1;
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save_pending = pending;
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if(save_pending == 0)
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return;
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pending = 0;
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/* We have pending interrupts, so disable signals, as the
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* handlers expect them off when they are called. They will
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* be enabled again above.
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*/
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signals_enabled = 0;
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/* Deal with SIGIO first because the alarm handler might
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* schedule, leaving the pending SIGIO stranded until we come
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* back here.
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*/
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if(save_pending & SIGIO_MASK)
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CHOOSE_MODE_PROC(sig_handler_common_tt,
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sig_handler_common_skas, SIGIO, NULL);
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if(save_pending & SIGALRM_MASK)
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real_alarm_handler(SIGALRM, NULL);
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if(save_pending & SIGVTALRM_MASK)
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real_alarm_handler(SIGVTALRM, NULL);
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}
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}
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int get_signals(void)
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{
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return signals_enabled;
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}
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int set_signals(int enable)
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{
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int ret;
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if(signals_enabled == enable)
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return enable;
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ret = signals_enabled;
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if(enable)
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unblock_signals();
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else block_signals();
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return ret;
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}
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void os_usr1_signal(int on)
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{
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change_sig(SIGUSR1, on);
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}
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