/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef OS_SOLARIS_VM_OS_SOLARIS_HPP
#define OS_SOLARIS_VM_OS_SOLARIS_HPP

// Solaris_OS defines the interface to Solaris operating systems

// Information about the protection of the page at address '0' on this os.
static bool zero_page_read_protected() { return true; }

class Solaris {
  friend class os;

 private:

  // Support for "new" libthread APIs for getting & setting thread context (2.8)
  #define TRS_VALID       0
  #define TRS_NONVOLATILE 1
  #define TRS_LWPID       2
  #define TRS_INVALID     3

  // _T2_libthread is true if we believe we are running with the newer
  // SunSoft lib/lwp/libthread: default Solaris 9, available Solaris 8
  // which is a lightweight libthread that also supports all T1
  static bool _T2_libthread;
  // These refer to new libthread interface functions
  // They get intialized if we dynamically detect new libthread
  static int_fnP_thread_t_iP_uP_stack_tP_gregset_t _thr_getstate;
  static int_fnP_thread_t_i_gregset_t _thr_setstate;
  static int_fnP_thread_t_i _thr_setmutator;
  static int_fnP_thread_t _thr_suspend_mutator;
  static int_fnP_thread_t _thr_continue_mutator;
  // libthread_init sets the above, if the new functionality is detected

  // initialized to libthread or lwp synchronization primitives depending on UseLWPSychronization
  static int_fnP_mutex_tP _mutex_lock;
  static int_fnP_mutex_tP _mutex_trylock;
  static int_fnP_mutex_tP _mutex_unlock;
  static int_fnP_mutex_tP_i_vP _mutex_init;
  static int_fnP_mutex_tP _mutex_destroy;
  static int _mutex_scope;

  static int_fnP_cond_tP_mutex_tP_timestruc_tP _cond_timedwait;
  static int_fnP_cond_tP_mutex_tP _cond_wait;
  static int_fnP_cond_tP _cond_signal;
  static int_fnP_cond_tP _cond_broadcast;
  static int_fnP_cond_tP_i_vP _cond_init;
  static int_fnP_cond_tP _cond_destroy;
  static int _cond_scope;

  typedef uintptr_t       lgrp_cookie_t;
  typedef id_t            lgrp_id_t;
  typedef int             lgrp_rsrc_t;
  typedef enum lgrp_view {
        LGRP_VIEW_CALLER,       /* what's available to the caller */
        LGRP_VIEW_OS            /* what's available to operating system */
  } lgrp_view_t;

  typedef uint_t (*getisax_func_t)(uint32_t* array, uint_t n);

  typedef lgrp_id_t (*lgrp_home_func_t)(idtype_t idtype, id_t id);
  typedef lgrp_cookie_t (*lgrp_init_func_t)(lgrp_view_t view);
  typedef int (*lgrp_fini_func_t)(lgrp_cookie_t cookie);
  typedef lgrp_id_t (*lgrp_root_func_t)(lgrp_cookie_t cookie);
  typedef int (*lgrp_children_func_t)(lgrp_cookie_t  cookie,  lgrp_id_t  parent,
                                      lgrp_id_t *lgrp_array, uint_t lgrp_array_size);
  typedef int (*lgrp_resources_func_t)(lgrp_cookie_t  cookie,  lgrp_id_t  lgrp,
                                      lgrp_id_t *lgrp_array, uint_t lgrp_array_size,
                                      lgrp_rsrc_t type);
  typedef int (*lgrp_nlgrps_func_t)(lgrp_cookie_t cookie);
  typedef int (*lgrp_cookie_stale_func_t)(lgrp_cookie_t cookie);
  typedef int (*meminfo_func_t)(const uint64_t inaddr[],   int addr_count,
                                const uint_t  info_req[],  int info_count,
                                uint64_t  outdata[], uint_t validity[]);

  static getisax_func_t _getisax;

  static lgrp_home_func_t _lgrp_home;
  static lgrp_init_func_t _lgrp_init;
  static lgrp_fini_func_t _lgrp_fini;
  static lgrp_root_func_t _lgrp_root;
  static lgrp_children_func_t _lgrp_children;
  static lgrp_resources_func_t _lgrp_resources;
  static lgrp_nlgrps_func_t _lgrp_nlgrps;
  static lgrp_cookie_stale_func_t _lgrp_cookie_stale;
  static lgrp_cookie_t _lgrp_cookie;

  static meminfo_func_t _meminfo;

  // Large Page Support
  static bool is_valid_page_size(size_t bytes);
  static size_t page_size_for_alignment(size_t alignment);
  static bool setup_large_pages(caddr_t start, size_t bytes, size_t align);

  static void init_thread_fpu_state(void);

  static void try_enable_extended_io();

  // For signal-chaining
  static unsigned long sigs;                 // mask of signals that have
                                             // preinstalled signal handlers
  static struct sigaction *(*get_signal_action)(int);
  static struct sigaction *get_preinstalled_handler(int);
  static int (*get_libjsig_version)();
  static void save_preinstalled_handler(int, struct sigaction&);
  static void check_signal_handler(int sig);
  // For overridable signals
  static int _SIGinterrupt;                  // user-overridable INTERRUPT_SIGNAL
  static int _SIGasync;                      // user-overridable ASYNC_SIGNAL
  static void set_SIGinterrupt(int newsig) { _SIGinterrupt = newsig; }
  static void set_SIGasync(int newsig) { _SIGasync = newsig; }

 public:
  // Large Page Support--ISM.
  static bool largepage_range(char* addr, size_t size);

  static int SIGinterrupt() { return _SIGinterrupt; }
  static int SIGasync() { return _SIGasync; }
  static address handler_start, handler_end; // start and end pc of thr_sighndlrinfo

  static bool valid_stack_address(Thread* thread, address sp);
  static bool valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect);
  static ucontext_t* get_valid_uc_in_signal_handler(Thread* thread,
    ucontext_t* uc);

  static ExtendedPC  ucontext_get_ExtendedPC(ucontext_t* uc);
  static intptr_t*   ucontext_get_sp(ucontext_t* uc);
  // ucontext_get_fp() is only used by Solaris X86 (see note below)
  static intptr_t*   ucontext_get_fp(ucontext_t* uc);
  static address    ucontext_get_pc(ucontext_t* uc);

  // For Analyzer Forte AsyncGetCallTrace profiling support:
  // Parameter ret_fp is only used by Solaris X86.
  //
  // We should have different declarations of this interface in
  // os_solaris_i486.hpp and os_solaris_sparc.hpp, but that file
  // provides extensions to the os class and not the Solaris class.
  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
    intptr_t** ret_sp, intptr_t** ret_fp);

  static void hotspot_sigmask(Thread* thread);

  // SR_handler
  static void SR_handler(Thread* thread, ucontext_t* uc);
 protected:
  // Solaris-specific interface goes here
  static julong available_memory();
  static julong physical_memory() { return _physical_memory; }
  static julong _physical_memory;
  static void initialize_system_info();
  static int _dev_zero_fd;
  static int get_dev_zero_fd() { return _dev_zero_fd; }
  static void set_dev_zero_fd(int fd) { _dev_zero_fd = fd; }
  static int commit_memory_impl(char* addr, size_t bytes, bool exec);
  static int commit_memory_impl(char* addr, size_t bytes,
                                size_t alignment_hint, bool exec);
  static char* mmap_chunk(char *addr, size_t size, int flags, int prot);
  static char* anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed);
  static bool mpss_sanity_check(bool warn, size_t * page_size);

  // Workaround for 4352906. thr_stksegment sometimes returns
  // a bad value for the primordial thread's stack base when
  // it is called more than one time.
  // Workaround is to cache the initial value to avoid further
  // calls to thr_stksegment.
  // It appears that someone (Hotspot?) is trashing the user's
  // proc_t structure (note that this is a system struct).
  static address _main_stack_base;

  static void print_distro_info(outputStream* st);
  static void print_libversion_info(outputStream* st);

 public:
  static void libthread_init();
  static void synchronization_init();
  static bool liblgrp_init();
  // Load miscellaneous symbols.
  static void misc_sym_init();
  // This boolean allows users to forward their own non-matching signals
  // to JVM_handle_solaris_signal, harmlessly.
  static bool signal_handlers_are_installed;

  static void signal_sets_init();
  static void install_signal_handlers();
  static void set_signal_handler(int sig, bool set_installed, bool oktochain);
  static void init_signal_mem();
  static bool is_sig_ignored(int sig);
  static void set_our_sigflags(int, int);
  static int get_our_sigflags(int);

  // For signal-chaining
  static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
                                 // signal(), sigset() is loaded
  static struct sigaction *get_chained_signal_action(int sig);
  static bool chained_handler(int sig, siginfo_t *siginfo, void *context);

  // The following allow us to link against both the old and new libthread (2.8)
  // and exploit the new libthread functionality if available.

  static bool T2_libthread()                                { return _T2_libthread; }
  static void set_T2_libthread(bool T2_libthread) { _T2_libthread = T2_libthread; }

  static int thr_getstate(thread_t tid, int *flag, unsigned *lwp, stack_t *ss, gregset_t rs)
    { return _thr_getstate(tid, flag, lwp, ss, rs); }
  static void set_thr_getstate(int_fnP_thread_t_iP_uP_stack_tP_gregset_t func)
    { _thr_getstate = func; }

  static int thr_setstate(thread_t tid, int flag, gregset_t rs)   { return _thr_setstate(tid, flag, rs); }
  static void set_thr_setstate(int_fnP_thread_t_i_gregset_t func) { _thr_setstate = func; }

  static int thr_setmutator(thread_t tid, int enabled)    { return _thr_setmutator(tid, enabled); }
  static void set_thr_setmutator(int_fnP_thread_t_i func) { _thr_setmutator = func; }

  static int  thr_suspend_mutator(thread_t tid)              { return _thr_suspend_mutator(tid); }
  static void set_thr_suspend_mutator(int_fnP_thread_t func) { _thr_suspend_mutator = func; }

  static int  thr_continue_mutator(thread_t tid)              { return _thr_continue_mutator(tid); }
  static void set_thr_continue_mutator(int_fnP_thread_t func) { _thr_continue_mutator = func; }

  // Allows us to switch between lwp and thread -based synchronization
  static int mutex_lock(mutex_t *mx)    { return _mutex_lock(mx); }
  static int mutex_trylock(mutex_t *mx) { return _mutex_trylock(mx); }
  static int mutex_unlock(mutex_t *mx)  { return _mutex_unlock(mx); }
  static int mutex_init(mutex_t *mx)    { return _mutex_init(mx, os::Solaris::mutex_scope(), NULL); }
  static int mutex_destroy(mutex_t *mx) { return _mutex_destroy(mx); }
  static int mutex_scope()              { return _mutex_scope; }

  static void set_mutex_lock(int_fnP_mutex_tP func)      { _mutex_lock = func; }
  static void set_mutex_trylock(int_fnP_mutex_tP func)   { _mutex_trylock = func; }
  static void set_mutex_unlock(int_fnP_mutex_tP func)    { _mutex_unlock = func; }
  static void set_mutex_init(int_fnP_mutex_tP_i_vP func) { _mutex_init = func; }
  static void set_mutex_destroy(int_fnP_mutex_tP func)   { _mutex_destroy = func; }
  static void set_mutex_scope(int scope)                 { _mutex_scope = scope; }

  static int cond_timedwait(cond_t *cv, mutex_t *mx, timestruc_t *abst)
                                                { return _cond_timedwait(cv, mx, abst); }
  static int cond_wait(cond_t *cv, mutex_t *mx) { return _cond_wait(cv, mx); }
  static int cond_signal(cond_t *cv)            { return _cond_signal(cv); }
  static int cond_broadcast(cond_t *cv)         { return _cond_broadcast(cv); }
  static int cond_init(cond_t *cv)              { return _cond_init(cv, os::Solaris::cond_scope(), NULL); }
  static int cond_destroy(cond_t *cv)           { return _cond_destroy(cv); }
  static int cond_scope()                       { return _cond_scope; }

  static void set_cond_timedwait(int_fnP_cond_tP_mutex_tP_timestruc_tP func)
                                                           { _cond_timedwait = func; }
  static void set_cond_wait(int_fnP_cond_tP_mutex_tP func) { _cond_wait = func; }
  static void set_cond_signal(int_fnP_cond_tP func)        { _cond_signal = func; }
  static void set_cond_broadcast(int_fnP_cond_tP func)     { _cond_broadcast = func; }
  static void set_cond_init(int_fnP_cond_tP_i_vP func)     { _cond_init = func; }
  static void set_cond_destroy(int_fnP_cond_tP func)       { _cond_destroy = func; }
  static void set_cond_scope(int scope)                    { _cond_scope = scope; }

  static void set_lgrp_home(lgrp_home_func_t func) { _lgrp_home = func; }
  static void set_lgrp_init(lgrp_init_func_t func) { _lgrp_init = func; }
  static void set_lgrp_fini(lgrp_fini_func_t func) { _lgrp_fini = func; }
  static void set_lgrp_root(lgrp_root_func_t func) { _lgrp_root = func; }
  static void set_lgrp_children(lgrp_children_func_t func)   { _lgrp_children = func; }
  static void set_lgrp_resources(lgrp_resources_func_t func) { _lgrp_resources = func; }
  static void set_lgrp_nlgrps(lgrp_nlgrps_func_t func)       { _lgrp_nlgrps = func; }
  static void set_lgrp_cookie_stale(lgrp_cookie_stale_func_t func) { _lgrp_cookie_stale = func; }
  static void set_lgrp_cookie(lgrp_cookie_t cookie)  { _lgrp_cookie = cookie; }

  static id_t lgrp_home(idtype_t type, id_t id)      { return _lgrp_home != NULL ? _lgrp_home(type, id) : -1; }
  static lgrp_cookie_t lgrp_init(lgrp_view_t view)   { return _lgrp_init != NULL ? _lgrp_init(view) : 0; }
  static int lgrp_fini(lgrp_cookie_t cookie)         { return _lgrp_fini != NULL ? _lgrp_fini(cookie) : -1; }
  static lgrp_id_t lgrp_root(lgrp_cookie_t cookie)   { return _lgrp_root != NULL ? _lgrp_root(cookie) : -1; };
  static int lgrp_children(lgrp_cookie_t  cookie,  lgrp_id_t  parent,
                    lgrp_id_t *lgrp_array, uint_t lgrp_array_size) {
    return _lgrp_children != NULL ? _lgrp_children(cookie, parent, lgrp_array, lgrp_array_size) : -1;
  }
  static int lgrp_resources(lgrp_cookie_t  cookie,  lgrp_id_t  lgrp,
                            lgrp_id_t *lgrp_array, uint_t lgrp_array_size,
                            lgrp_rsrc_t type) {
    return _lgrp_resources != NULL ? _lgrp_resources(cookie, lgrp, lgrp_array, lgrp_array_size, type) : -1;
  }

  static int lgrp_nlgrps(lgrp_cookie_t cookie)       { return _lgrp_nlgrps != NULL ? _lgrp_nlgrps(cookie) : -1; }
  static int lgrp_cookie_stale(lgrp_cookie_t cookie) {
    return _lgrp_cookie_stale != NULL ? _lgrp_cookie_stale(cookie) : -1;
  }
  static lgrp_cookie_t lgrp_cookie()                 { return _lgrp_cookie; }

  static bool supports_getisax()                     { return _getisax != NULL; }
  static uint_t getisax(uint32_t* array, uint_t n);

  static void set_meminfo(meminfo_func_t func)       { _meminfo = func; }
  static int meminfo (const uint64_t inaddr[],   int addr_count,
                     const uint_t  info_req[],  int info_count,
                     uint64_t  outdata[], uint_t validity[]) {
    return _meminfo != NULL ? _meminfo(inaddr, addr_count, info_req, info_count,
                                       outdata, validity) : -1;
  }

  enum {
    clear_interrupted = true
  };
  static void setup_interruptible(JavaThread* thread);
  static void setup_interruptible_already_blocked(JavaThread* thread);
  static JavaThread* setup_interruptible();
  static void cleanup_interruptible(JavaThread* thread);

  // perf counter incrementers used by _INTERRUPTIBLE

  static void bump_interrupted_before_count();
  static void bump_interrupted_during_count();

#ifdef ASSERT
  static JavaThread* setup_interruptible_native();
  static void cleanup_interruptible_native(JavaThread* thread);
#endif

  static sigset_t* unblocked_signals();
  static sigset_t* vm_signals();
  static sigset_t* allowdebug_blocked_signals();

  // %%% Following should be promoted to os.hpp:
  // Trace number of created threads
  static          jint  _os_thread_limit;
  static volatile jint  _os_thread_count;

  // Minimum stack size a thread can be created with (allowing
  // the VM to completely create the thread and enter user code)

  static size_t min_stack_allowed;

  // Stack overflow handling

  static int max_register_window_saves_before_flushing();

  // Stack repair handling

  // none present

};

class PlatformEvent : public CHeapObj<mtInternal> {
  private:
    double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line
    volatile int _Event ;
    int _nParked ;
    int _pipev [2] ;
    mutex_t _mutex  [1] ;
    cond_t  _cond   [1] ;
    double PostPad  [2] ;

  protected:
    // Defining a protected ctor effectively gives us an abstract base class.
    // That is, a PlatformEvent can never be instantiated "naked" but only
    // as a part of a ParkEvent (recall that ParkEvent extends PlatformEvent).
    // TODO-FIXME: make dtor private
    ~PlatformEvent() { guarantee (0, "invariant") ; }
    PlatformEvent() {
      int status;
      status = os::Solaris::cond_init(_cond);
      assert_status(status == 0, status, "cond_init");
      status = os::Solaris::mutex_init(_mutex);
      assert_status(status == 0, status, "mutex_init");
      _Event   = 0 ;
      _nParked = 0 ;
      _pipev[0] = _pipev[1] = -1 ;
    }

  public:
    // Exercise caution using reset() and fired() -- they may require MEMBARs
    void reset() { _Event = 0 ; }
    int  fired() { return _Event; }
    void park () ;
    int  park (jlong millis) ;
    int  TryPark () ;
    void unpark () ;
} ;

class PlatformParker : public CHeapObj<mtInternal> {
  protected:
    mutex_t _mutex [1] ;
    cond_t  _cond  [1] ;

  public:       // TODO-FIXME: make dtor private
    ~PlatformParker() { guarantee (0, "invariant") ; }

  public:
    PlatformParker() {
      int status;
      status = os::Solaris::cond_init(_cond);
      assert_status(status == 0, status, "cond_init");
      status = os::Solaris::mutex_init(_mutex);
      assert_status(status == 0, status, "mutex_init");
    }
} ;

#endif // OS_SOLARIS_VM_OS_SOLARIS_HPP