/*****************************************************************************************
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.
$Id$
*****************************************************************************************/
#include <lib/kmalloc.h>
#include <lib/kprintf.h>
#include <ubixos/kpanic.h>
#include <ubixos/sched.h>
#include <ubixos/spinlock.h>
#include <vmm/vmm.h>
#include <string.h>
#include <assert.h>
static struct memDescriptor *kernDesc = 0x0;
static struct memDescriptor *freeKernDesc = 0x0;
static struct memDescriptor *emptyKernDesc = 0x0;
static spinLock_t mallocSpinLock = SPIN_LOCK_INITIALIZER;
static spinLock_t emptyDescSpinLock = SPIN_LOCK_INITIALIZER;
static void initMalloc() {
int i = 0x0;
emptyKernDesc = (struct memDescriptor *)vmmGetFreeKernelPage(sysID,4);
memset(emptyKernDesc,0x0,0x4000);
emptyKernDesc[0].next = &emptyKernDesc[1];
for (i = 0x1;i < ((0x1000/sizeof(struct memDescriptor))*4);i++) {
emptyKernDesc[i].next = &emptyKernDesc[i+1];
emptyKernDesc[i].prev = &emptyKernDesc[i-1];
}
//Return
return;
}
/************************************************************************
Function: void *getEmptyDesc()
Description: Find An Empty Descriptor
Notes:
02/17/03 - Is This Efficient?
************************************************************************/
static void *getEmptyDesc() {
struct memDescriptor *tmpDesc = emptyKernDesc;
assert(tmpDesc);
spinLock(&emptyDescSpinLock);
if (tmpDesc != 0x0) {
emptyKernDesc = tmpDesc->next;
emptyKernDesc->prev = 0x0;
tmpDesc->next = 0x0;
tmpDesc->prev = 0x0;
spinUnlock(&emptyDescSpinLock);
return(tmpDesc);
}
kpanic("Error Finding Empty Descriptor!\n");
return(0x0);
}
/************************************************************************
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 void insertFreeDesc(struct memDescriptor *freeDesc) {
struct memDescriptor *tmpDesc;
assert(freeDesc);
freeDesc->status = 0x0;
if (freeKernDesc != 0x0) {
for (tmpDesc=freeKernDesc;tmpDesc;tmpDesc=tmpDesc->next) {
if ((freeDesc->limit >= tmpDesc->limit) && (!tmpDesc->next)) {
tmpDesc->next = freeDesc;
freeDesc->prev = tmpDesc;
freeDesc->next = 0x0;
return;
}
else if ((freeDesc->limit >= tmpDesc->limit) && (freeDesc->limit <= tmpDesc->next->limit)) {
freeDesc->next = tmpDesc->next;
freeDesc->prev = tmpDesc;
tmpDesc->next->prev = freeDesc;
tmpDesc->next = freeDesc;
return;
}
}
}
else {
freeDesc->prev = 0x0;
freeDesc->next = 0x0;
freeKernDesc = freeDesc;
return;
}
//sysErr("Error With Freeing Blocks");
return;
}
/************************************************************************
Function: void mergeMemBlocks()
Description: This Function Will Merge Free Blocks And Free Pages
Notes:
03/05/03 - We Have A Problem It Seems The First Block Is Limit 0x0
************************************************************************/
static void mergeMemBlocks() {
struct memDescriptor *tmpDesc1 = 0x0;
struct memDescriptor *tmpDesc2 = 0x0;
uInt32 baseAddr = 0x0;
return;
//Loop The Free Descriptors See If We Can Merge Them
for (tmpDesc1=freeKernDesc;tmpDesc1;tmpDesc1=tmpDesc1->next) {
/*
Compare The Base Addr With The Other Descriptors If You Find The One
That You Are Looking For Lets Merge Them
*/
if (tmpDesc1->limit != 0x0) {
baseAddr = (uInt32)tmpDesc1->baseAddr + (uInt32)tmpDesc1->limit;
for (tmpDesc2=freeKernDesc;tmpDesc2;tmpDesc2=tmpDesc2->next) {
if ((uInt32)tmpDesc2->baseAddr == baseAddr) {
tmpDesc1->limit += tmpDesc2->limit;
tmpDesc2->baseAddr = 0x0;
tmpDesc2->limit = 0x0;
tmpDesc2->status = 0x0;
if (tmpDesc2->prev) {
tmpDesc2->prev->next = tmpDesc2->next;
}
if (tmpDesc2->next) {
tmpDesc2->next->prev = tmpDesc2->prev;
}
tmpDesc2->prev = 0x0;
tmpDesc2->next = emptyKernDesc;
emptyKernDesc->prev = tmpDesc2;
emptyKernDesc = tmpDesc2;
if (tmpDesc1->prev) {
tmpDesc1->prev->next = tmpDesc1->next;
}
if (tmpDesc1->next) {
tmpDesc1->next->prev = tmpDesc1->prev;
}
tmpDesc1->prev = 0x0;
tmpDesc1->next = 0x0;
insertFreeDesc(tmpDesc1);
tmpDesc1 = freeKernDesc;
break;
}
}
}
}
return;
}
/************************************************************************
Function: void *kmalloc(uInt32 len)
Description: Allocate Kernel Memory
Notes:
02/17/03 - Do I Still Need To Pass In The Pid?
************************************************************************/
void *kmalloc(uInt32 len) {
struct memDescriptor *tmpDesc1 = 0x0;
struct memDescriptor *tmpDesc2 = 0x0;
char *buf = 0x0;
int i = 0x0;
spinLock(&mallocSpinLock);
//If Kernel Descriptor Is NULL Initialize Malloc
if (emptyKernDesc == 0x0) {
initMalloc();
}
len = (len + 15) & 0xFFFFFFF0;
if (len == 0x0) {
kpanic("Malloc of Size 0 Requested\n");
spinUnlock(&mallocSpinLock);
return(0x0);
}
for (tmpDesc1 = freeKernDesc;tmpDesc1;tmpDesc1=tmpDesc1->next) {
if (tmpDesc1->limit >= len) {
tmpDesc1->status = 0x1;
if (tmpDesc1->prev != 0x0) {
tmpDesc1->prev->next = tmpDesc1->next;
tmpDesc1->next->prev = tmpDesc1->prev;
}
else {
freeKernDesc = tmpDesc1->next;
freeKernDesc->prev = 0x0;
}
tmpDesc1->prev = 0x0;
tmpDesc1->next = kernDesc;
kernDesc->prev = tmpDesc1;
kernDesc = tmpDesc1;
if (tmpDesc1->limit > (len + 16)) {
tmpDesc2 = getEmptyDesc();
assert(tmpDesc2);
tmpDesc2->limit = tmpDesc1->limit - len;
tmpDesc1->limit = len;
tmpDesc2->baseAddr = tmpDesc1->baseAddr + len;
tmpDesc2->status = 0x0;
tmpDesc2->next = 0x0;
tmpDesc2->prev = 0x0;
insertFreeDesc(tmpDesc2);
}
buf = (char *)tmpDesc1->baseAddr;
for (i=0;i<tmpDesc1->limit;i++) {
(char)buf[i] = (char)0x0;
}
spinUnlock(&mallocSpinLock);
return(tmpDesc1->baseAddr);
}
}
tmpDesc1 = getEmptyDesc();
if (tmpDesc1 != 0x0) {
tmpDesc1->baseAddr = (struct memDescriptor *)vmmGetFreeKernelPage(sysID,((len + 4095)/4096));
tmpDesc1->limit = len;
tmpDesc1->status = 0x1;
tmpDesc1->next = kernDesc;
tmpDesc1->prev = 0x0;
kernDesc = tmpDesc1;
kernDesc->next->prev = tmpDesc1;
if ((len-4096) > 0) {
tmpDesc2 = getEmptyDesc();
assert(tmpDesc2);
tmpDesc2->status = 0x0;
tmpDesc2->baseAddr = tmpDesc1->baseAddr + tmpDesc1->limit;
tmpDesc2->limit = ((len + 4095)/4096)*4096 - tmpDesc1->limit;
tmpDesc2->prev = 0x0;
tmpDesc2->next = 0x0;
insertFreeDesc(tmpDesc2);
}
buf = (char *)tmpDesc1->baseAddr;
for (i=0;i<tmpDesc1->limit;i++) {
(char)buf[i] = (char)0x0;
}
spinUnlock(&mallocSpinLock);
return(tmpDesc1->baseAddr);
}
//Return Null If Unable To Malloc
spinUnlock(&mallocSpinLock);
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 kfree(void *baseAddr) {
uInt32 *data = 0x0;
long i = 0x0;
struct memDescriptor *tmpDesc1 = 0x0;
struct memDescriptor *tmpDesc2 = 0x0;
spinLock(&mallocSpinLock);
for (tmpDesc1=kernDesc;tmpDesc1;tmpDesc1=tmpDesc1->next) {
if (tmpDesc1->baseAddr == baseAddr) {
tmpDesc1->status = 0x0;
if (tmpDesc1->prev != 0x0) {
tmpDesc2 = tmpDesc1->prev;
tmpDesc2->next = tmpDesc1->next;
}
if (tmpDesc1->next != 0x0) {
tmpDesc2 = tmpDesc1->next;
tmpDesc2->prev = tmpDesc1->prev;
}
if (kernDesc == tmpDesc1) {
kernDesc = tmpDesc1->next;
}
tmpDesc1->next = 0x0;
tmpDesc1->prev = 0x0;
insertFreeDesc(tmpDesc1);
data = (uInt32 *)baseAddr;
for (i=0;i < (tmpDesc1->limit/4);i++) {
data[i] = 0x0;
}
mergeMemBlocks();
spinUnlock(&mallocSpinLock);
return;
}
}
kprintf("Error Freeing Descriptor! [0x%X]\n",baseAddr);
spinUnlock(&mallocSpinLock);
return;
}
/***
$Log$
Revision 1.12 2004/07/20 18:58:24 reddawg
Few fixes
Revision 1.11 2004/07/18 05:24:15 reddawg
Fixens
Revision 1.10 2004/07/17 18:00:47 reddawg
kmalloc: added assert()
Revision 1.9 2004/07/17 15:54:52 reddawg
kmalloc: added assert()
bioscall: fixed some potential problem by not making 16bit code
paging: added assert()
Revision 1.8 2004/06/17 14:50:32 reddawg
kmalloc: converted some variables to static
Revision 1.7 2004/06/17 02:54:54 flameshadow
chg: fixed cast
Revision 1.6 2004/05/26 11:56:51 reddawg
kmalloc: fixed memrgeMemBlocks hopefully it will prevent future segfault issues
by not having any more overlapping blocks
Revision 1.5 2004/05/25 14:01:14 reddawg
Implimented Better Spinlocking No More Issues With KMALLOC which actually
was causing bizzare problems
END
***/
