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os-k/kaleid/kernel/mm/palloc.c

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Page allocator related functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K 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 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <kernel.h>
#include <init/boot.h>
#include <ex/malloc.h>
#include <mm/paging.h>
#include <mm/palloc.h>
#include <mm/map.h>
#include <io/vga.h>
#include <lib/buf.h>
#include <ke/time.h>
//---------
enum
{
Whatever = 1UL << 52,
Whatever2 = 1UL << 62
};
static AllocatedPage_t busyPagesList = { (void*)0, (void*)0, 0, (AllocatedPage_t*)0 };
extern MemoryMap_t memoryMap;
extern ulong MmPhysLastKernAddress;
static ulong NSuccessfulAlloc = 0;
static ulong NSuccessfulFree = 0;
//---------
// Returns 0 if page is not busy, its last address if yes
static ulong isPageBusy(void *phyPageAddr)
{
AllocatedPage_t *busyPage = &busyPagesList;
ulong isBusy = 0;
// In case of NVS, ACPI or BADRAM zone, considered busy
if (!MmGetAvailZoneSize(phyPageAddr))
return true;
// Search in the busylist if the phy addr is here
while(busyPage->next) {
busyPage = busyPage->next;
if (phyPageAddr >= busyPage->phyAddressBegin
&& phyPageAddr <= busyPage->phyAddressEnd
) {
isBusy = (ulong)busyPage->phyAddressEnd;
break;
}
}
return isBusy;
}
static void printBusyPages(void)
{
AllocatedPage_t *busyPage = &busyPagesList;
if (!busyPage->next) {
KernLog("No busy page\n");
} else {
while(busyPage->next) {
busyPage = busyPage->next;
KernLog("Busy page at %p-%p\n", busyPage->phyAddressBegin,
busyPage->phyAddressEnd);
}
}
}
static ulong MmBusyPagesSpace(void)
{
ulong c = 0;
AllocatedPage_t *busyPage = &busyPagesList;
if (!busyPage->next) {
return 0;
} else {
while(busyPage->next) {
busyPage = busyPage->next;
c += 4096 + (busyPage->phyAddressEnd - busyPage->phyAddressBegin);
}
}
return c;
}
static void addPageToBusyList(void *phyPageAddrBegin, void *phyPageAddrEnd, ulong id)
{
AllocatedPage_t *busyPage = &busyPagesList;
AllocatedPage_t *prevBusyPage = NULL;
while(busyPage->next) {
prevBusyPage = busyPage;
busyPage = busyPage->next;
if (busyPage->phyAddressBegin > phyPageAddrEnd) {
busyPage = prevBusyPage;
break;
}
}
AllocatedPage_t *newBusyPage =
(AllocatedPage_t*)malloc(sizeof(AllocatedPage_t));
newBusyPage->phyAddressBegin = phyPageAddrBegin;
newBusyPage->phyAddressEnd = phyPageAddrEnd;
newBusyPage->id = id;
newBusyPage->next = busyPage->next;
busyPage->next = newBusyPage;
}
static void removePageFromBusyList(void *phyPageAddrBegin)
{
AllocatedPage_t *busyPage = &busyPagesList;
AllocatedPage_t *prevBusyPage = NULL;
while(busyPage->next) {
prevBusyPage = busyPage;
busyPage = busyPage->next;
if (phyPageAddrBegin == busyPage->phyAddressBegin) {
prevBusyPage->next = busyPage->next;
free(busyPage);
break;
}
}
}
//
// Returns an id to identify a page frame allocated (kernel)
//
ulong MmAllocPageFrame(size_t size, bool contiguous)
{
static ulong id = 0;
ulong pageNumber = (((ulong)size - 1) / KPAGESIZE) + 1;
size_t curNumber = 0;
void *futureBegin = 0;
void *futureEnd = 0;
ulong busyLastAddr = 0;
// Incrementing id
id++;
// Maximum PHYSICAL address in memory
ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
DebugLog("Allocating %d pages...\n", pageNumber);
for (void *curPage = (void*)(MmPhysLastKernAddress + KPAGESIZE);
curPage < (void*)phRamSize; curPage += KPAGESIZE) {
busyLastAddr = isPageBusy(curPage);
if (!busyLastAddr) {
if (!futureBegin) {
futureBegin = curPage;
//DebugLog("Select begin : %p\n", curPage);
}
futureEnd = curPage;
//DebugLog("Select page : %p\n", curPage);
if (++curNumber >= pageNumber) {
break;
}
} else {
if (!contiguous) {
if (futureBegin && futureEnd)
addPageToBusyList(futureBegin, futureEnd, id);
futureBegin = 0;
} else {
curNumber = 0;
futureBegin = 0;
}
}
}
if (curNumber != pageNumber) {
KeStartPanic("MmAllocPageFrame() : No more free pages to allocate");
}
if (futureBegin && futureEnd)
addPageToBusyList(futureBegin, futureEnd, id);
NSuccessfulAlloc++;
return id;
}
//
// Frees a page frame by its id
//
void MmFreePageFrame(ulong id)
{
AllocatedPage_t *busyPage = &busyPagesList;
bool success = false;
while(busyPage->next) {
busyPage = busyPage->next;
if (id == busyPage->id) {
removePageFromBusyList(busyPage->phyAddressBegin);
success = true;
}
}
if (success)
NSuccessfulFree++;
}
//
// Maps an allocated page frame to the given address
//
error_t MmMapPageFrame(ulong id, void *virtAddr, ulong flags)
{
AllocatedPage_t *busyPage = &busyPagesList;
while(busyPage->next) {
busyPage = busyPage->next;
if (id == busyPage->id) {
for (void *addr = busyPage->phyAddressBegin; addr <= busyPage->phyAddressEnd; addr += KPAGESIZE) {
if (MmTransPhyToVirtAddr(addr)) {
return EADDRINUSE;
}
//DebugLog("Map %p at %p\n", addr, virtAddr);
MmMapPage((void*)((ulong)virtAddr), (void*)addr, flags);
virtAddr += KPAGESIZE;
}
}
}
return EOK;
}
error_t MmUnmapPageFrame(ulong id)
{
AllocatedPage_t *busyPage = &busyPagesList;
void *actualPhys = 0;
while(busyPage->next) {
busyPage = busyPage->next;
if (id == busyPage->id) {
for (void *addr = busyPage->phyAddressBegin; addr <= busyPage->phyAddressEnd; addr += KPAGESIZE) {
actualPhys = MmTransPhyToVirtAddr(addr);
//DebugLog("Map %p at %p\n", addr, virtAddr);
if (actualPhys && id == busyPage->id) {
MmUnmapPage(MmTransPhyToVirtAddr(addr));
}
}
}
}
return EOK;
}
ulong tab[4000] = {0};
error_t MmTestBusyPage(ulong size, ulong flags)
{
/* for (int i = 0; i < 2000; i++) { */
/* if (rand() %2) { */
/* if (rand() %2) { */
/* tab[j++] = MmAllocPageFrame(rand()%6553689, NORMAL); */
/* } else { */
/* tab[j++] = MmAllocPageFrame(rand()%6553689, CONTIGUOUS); */
/* } */
/* } else { */
/* MmFreePageFrame(tab[rand() % (j+1)]); */
/* } */
/* //DebugLog("Alloc : %d; Free : %d; Count : %lu Mo\n", NSuccessfulAlloc, NSuccessfulFree, MmBusyPagesSpace() / MB); */
/* } */
ulong a = KeGetTicks();
DebugLog("Start alloc 1: %lu s\n", a/1000);
tab[0] = MmAllocPageFrame(size*KB, NORMAL);
ulong b = KeGetTicks();
DebugLog("End alloc : %lu s\n", b/1000);
DebugLog("Alloc time : %lu s\n", (b-a)/1000);
DebugLog("Alloc : %d; Free : %d; Count : %lu Mo\n", NSuccessfulAlloc, NSuccessfulFree, MmBusyPagesSpace() / MB);
printBusyPages();
a = KeGetTicks();
DebugLog("Start map at %p wit %p: %lu ms\n", USERSPACE, flags, a);
MmMapPageFrame(tab[0], (void*)(USERSPACE), flags);
b = KeGetTicks();
DebugLog("End map : %lu ms\n", b);
DebugLog("Map time : %lu ms\n", (b-a));
a = KeGetTicks();
DebugLog("Start unmap at %p wit %p: %lu ms\n", USERSPACE, flags, a);
MmUnmapPageFrame(tab[0]);
b = KeGetTicks();
DebugLog("End map : %lu ms\n", b);
DebugLog("Map time : %lu ms\n", (b-a));
DebugLog("Finished !\n");
return EOK;
}
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