/*****************************************************************************************
Copyright (c) 2002-2004 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS 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.
$Id: malloc.c 122 2016-01-14 03:45:52Z reddawg $
*****************************************************************************************/
#include <sys/types.h>
#include <sys/sys.h>
#include <stdio.h>
struct memDescriptor {
struct memDescriptor *prev; //4
struct memDescriptor *next; //4
void *baseAddr; //4
uint32_t limit; //4
};
#define MALLOC_ALIGN_SIZE 32
#define MALLOC_ALIGN(size) (size + ((((size) % MALLOC_ALIGN_SIZE) == 0)? 0 : (MALLOC_ALIGN_SIZE - ((size) % MALLOC_ALIGN_SIZE))))
static int insertFreeDesc( struct memDescriptor *freeDesc );
static struct memDescriptor *usedKernDesc = 0x0;
static struct memDescriptor *freeKernDesc = 0x0;
static struct memDescriptor *emptyKernDesc = 0x0;
static void *getEmptyDesc() {
int i = 0x0;
struct memDescriptor *tmpDesc = 0x0;
tmpDesc = emptyKernDesc;
if ( tmpDesc != 0x0 ) {
emptyKernDesc = tmpDesc->next;
if ( emptyKernDesc != 0x0 )
emptyKernDesc->prev = 0x0;
tmpDesc->next = 0x0;
tmpDesc->prev = 0x0;
return ( tmpDesc );
}
if ( ( emptyKernDesc = (struct memDescriptor *) getPage( 0x4 ) ) == 0x0 )
return ( 0x0 );
/* zero out the memory so we know there is no garbage */
memset( emptyKernDesc, 0x0, 0x4000 );
emptyKernDesc[0].next = &emptyKernDesc[1];
for ( i = 0x1; i < ( ( 0x4000 / sizeof(struct memDescriptor) ) ) ; i++ ) {
emptyKernDesc[i].next = &emptyKernDesc[i + 1];
emptyKernDesc[i].prev = &emptyKernDesc[i - 1];
}
tmpDesc = emptyKernDesc;
emptyKernDesc = tmpDesc->next;
emptyKernDesc->prev = 0x0;
tmpDesc->next = 0x0;
tmpDesc->prev = 0x0;
return ( tmpDesc );
}
/************************************************************************
Function: void *kmalloc(uint32_t len)
Description: Allocate Kernel Memory
Notes:
02/17/03 - Do I Still Need To Pass In The Pid?
************************************************************************/
void *malloc( uint32_t len ) {
struct memDescriptor *tmpDesc1 = 0x0;
struct memDescriptor *tmpDesc2 = 0x0;
char *buf = 0x0;
int i = 0x0;
len = MALLOC_ALIGN( len );
if ( len == 0x0 ) {
return ( 0x0 );
}
for ( tmpDesc1 = freeKernDesc; tmpDesc1 != 0x0 ; tmpDesc1 = tmpDesc1->next ) {
if ( tmpDesc1->limit >= len ) {
if ( tmpDesc1->prev != 0x0 )
tmpDesc1->prev->next = tmpDesc1->next;
if ( tmpDesc1->next != 0x0 )
tmpDesc1->next->prev = tmpDesc1->prev;
if ( tmpDesc1 == freeKernDesc )
freeKernDesc = tmpDesc1->next;
tmpDesc1->prev = 0x0;
tmpDesc1->next = usedKernDesc;
if ( usedKernDesc != 0x0 )
usedKernDesc->prev = tmpDesc1;
usedKernDesc = tmpDesc1;
if ( tmpDesc1->limit > ( len + 32 ) ) {
tmpDesc2 = getEmptyDesc();
tmpDesc2->limit = tmpDesc1->limit - len;
tmpDesc1->limit = len;
tmpDesc2->baseAddr = tmpDesc1->baseAddr + len;
tmpDesc2->next = 0x0;
tmpDesc2->prev = 0x0;
if ( tmpDesc2->limit <= 0x0 )
insertFreeDesc( tmpDesc2 );
}
buf = (char *) tmpDesc1->baseAddr;
for ( i = 0; i < tmpDesc1->limit ; i++ ) {
buf[i] = (char) 0x0;
}
return ( tmpDesc1->baseAddr );
}
}
tmpDesc1 = getEmptyDesc();
if ( tmpDesc1 != 0x0 ) {
tmpDesc1->baseAddr = (struct memDescriptor *) getPage( ( len + 4095 ) / 4096 );
tmpDesc1->limit = len;
tmpDesc1->next = usedKernDesc;
tmpDesc1->prev = 0x0;
if ( usedKernDesc != 0x0 )
usedKernDesc->prev = tmpDesc1;
usedKernDesc = tmpDesc1;
if ( ( len % 0x1000 ) > 0 ) {
tmpDesc2 = getEmptyDesc();
tmpDesc2->baseAddr = tmpDesc1->baseAddr + tmpDesc1->limit;
tmpDesc2->limit = ( ( ( len + 4095 ) / 4096 ) * 4096 ) - tmpDesc1->limit;
tmpDesc2->prev = 0x0;
tmpDesc2->next = 0x0;
if ( tmpDesc2->limit <= 0x0 )
insertFreeDesc( tmpDesc2 );
}
buf = (char *) tmpDesc1->baseAddr;
for ( i = 0; i < tmpDesc1->limit ; i++ ) {
buf[i] = (char) 0x0;
}
return ( tmpDesc1->baseAddr );
}
//Return Null If Unable To Malloc
return ( 0x0 );
}
/************************************************************************
Function: void kfree(void *baseAddr)
Description: This Will Find The Descriptor And Free It
Notes:
02/17/03 - I need To Make It Join Descriptors
************************************************************************/
void free( void *baseAddr ) {
struct memDescriptor *tmpDesc1 = 0x0;
for ( tmpDesc1 = usedKernDesc; tmpDesc1 != 0x0 ; tmpDesc1 = tmpDesc1->next ) {
if ( tmpDesc1->baseAddr == baseAddr ) {
if ( usedKernDesc == tmpDesc1 )
usedKernDesc = tmpDesc1->next;
if ( tmpDesc1->prev != 0x0 )
tmpDesc1->prev->next = tmpDesc1->next;
if ( tmpDesc1->next != 0x0 )
tmpDesc1->next->prev = tmpDesc1->prev;
tmpDesc1->next = 0x0;
tmpDesc1->prev = 0x0;
insertFreeDesc( tmpDesc1 );
//mergeMemBlocks();
return;
}
}
printf( "Kernel: Error Freeing Descriptor! [0x%X]\n", (uint32_t) baseAddr );
return;
}
/************************************************************************
Function: void insertFreeDesc(struct memDescriptor *freeDesc)
Description: This Function Inserts A Free Descriptor On The List Which Is
Kept In Size Order
Notes:
02/17/03 - This Was Inspired By TCA's Great Wisdom -
"[20:20:59] <TCA> You should just insert it in order"
************************************************************************/
static int insertFreeDesc( struct memDescriptor *freeDesc ) {
struct memDescriptor *tmpDesc = 0x0;
if ( freeDesc->limit <= 0x0 ) {
printf( "Inserting Descriptor with no limit\n" );
while ( 1 )
;
}
if ( freeKernDesc != 0x0 ) {
/*
*/
freeDesc->next = freeKernDesc;
freeDesc->prev = 0x0;
freeKernDesc->prev = freeDesc;
freeKernDesc = freeDesc;
/*
*/
/*
for (tmpDesc = freeKernDesc;tmpDesc != 0x0;tmpDesc = tmpDesc->next) {
if (freeDesc->limit <= tmpDesc->limit) {
freeDesc->prev = tmpDesc->prev;
tmpDesc->prev = freeDesc;
freeDesc->next = tmpDesc;
if (tmpDesc == freeKernDesc)
freeKernDesc = freeDesc;
return(0x0);
}
if (tmpDesc->next == 0x0) {
tmpDesc->next = freeDesc;
freeDesc->prev = tmpDesc;
freeDesc->next = 0x0;
return(0x0);
}
}
kpanic("didnt Insert\n");
*/
return ( 0x0 );
}
else {
freeDesc->prev = 0x0;
freeDesc->next = 0x0;
freeKernDesc = freeDesc;
return ( 0x0 );
}
return ( 0x1 );
}
/***
$Log: malloc.c,v $
Revision 1.1.1.1 2006/06/01 12:46:10 reddawg
ubix2
Revision 1.5 2006/06/01 03:58:33 reddawg
wondering about this stuff here
Revision 1.4 2005/10/21 20:57:35 reddawg
Ubix Is Back In A Working Condition
Revision 1.3 2005/10/21 20:07:07 reddawg
Work has resumed
Revision 1.2 2005/10/12 00:13:36 reddawg
Removed
Revision 1.1.1.1 2005/09/26 17:22:57 reddawg
no message
Revision 1.7 2004/10/02 12:58:38 reddawg
weird...
Revision 1.6 2004/09/29 22:30:52 reddawg
hmm permission error
Revision 1.5 2004/07/28 00:17:05 reddawg
Major:
Disconnected page 0x0 from the system... Unfortunately this broke many things
all of which have been fixed. This was good because nothing deferences NULL
any more.
Things affected:
malloc,kmalloc,getfreepage,getfreevirtualpage,pagefault,fork,exec,ld,ld.so,exec,file
Revision 1.4 2004/06/17 14:18:41 reddawg
Fixed some potential problems
Revision 1.3 2004/05/22 02:32:41 reddawg
Fixed a typo
Revision 1.2 2004/05/20 23:10:46 reddawg
New Userland Malloc
Revision 1.4 2004/05/20 22:54:02 reddawg
Cleaned Up Warrnings
Revision 1.3 2004/05/19 04:07:43 reddawg
kmalloc(size,pid) no more it is no kmalloc(size); the way it should of been
Revision 1.2 2004/04/20 00:53:16 reddawg
Works
Revision 1.1.1.1 2004/04/15 12:07:10 reddawg
UbixOS v1.0
Revision 1.21 2004/04/13 16:36:33 reddawg
Changed our copyright, it is all now under a BSD-Style license
END
***/
