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//
// tls.c
//
// Thread local storage
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright 
//    notice, this list of conditions and the following disclaimer.  
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.  
// 3. Neither the name of the project nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
// SUCH DAMAGE.
// 

#include <os.h>
#include <bitops.h>

unsigned char tlsbitmap[MAX_TLS / 8];

tls_t tlsalloc() {
  tls_t index = find_first_zero_bit(tlsbitmap, MAX_TLS);
  if (index == MAX_TLS) return INVALID_TLS_INDEX;
  set_bit(tlsbitmap, index);

  return index;
}

void tlsfree(tls_t index) {
  if (index >= 0 && index < MAX_TLS) {
    clear_bit(tlsbitmap, index);
  }
}

void *tlsget(tls_t index) {
  struct tib *tib;

  __asm {
    mov eax, fs:[TIB_SELF_OFFSET]
    mov [tib], eax
  }

  return tib->tls[index];
}

int tlsset(tls_t index, void *value) {
  struct tib *tib;

  __asm {
    mov eax, fs:[TIB_SELF_OFFSET]
    mov [tib], eax
  }

  tib->tls[index] = value;
  return 0;
}