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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>
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#include <mm/map.h>
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#include <io/vga.h>
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#include <lib/buf.h>
#include <ke/time.h>
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//---------
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enum
{
Whatever = 1UL << 52,
Whatever2 = 1UL << 62
};
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static AllocatedPage_t busyPagesList = { (void*)0, (void*)0, 0, (AllocatedPage_t*)0 };
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extern MemoryMap_t memoryMap;
extern ulong MmPhysLastKernAddress;
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static ulong NSuccessfulAlloc = 0;
static ulong NSuccessfulFree = 0;
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//---------
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// Returns 0 if page is not busy, its last address if yes
static ulong isPageBusy(void *phyPageAddr)
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{
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AllocatedPage_t *busyPage = &busyPagesList;
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ulong isBusy = 0;
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// In case of NVS, ACPI or BADRAM zone, considered busy
if (MmIsBusyZone(phyPageAddr)) {
return 1;
}
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// Search in the busylist if the phy addr is here
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while(busyPage->next) {
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busyPage = busyPage->next;
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if (phyPageAddr >= busyPage->phyAddressBegin
&& phyPageAddr <= busyPage->phyAddressEnd
) {
isBusy = (ulong)busyPage->phyAddressEnd;
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break;
}
}
return isBusy;
}
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static void printBusyPages(void)
{
AllocatedPage_t *busyPage = &busyPagesList;
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if (!busyPage->next) {
KernLog("No busy page\n");
} else {
while(busyPage->next) {
busyPage = busyPage->next;
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KernLog("Busy page at %p-%p\n", busyPage->phyAddressBegin,
busyPage->phyAddressEnd);
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}
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}
}
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ulong MmGetBusyPageSize(void)
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{
ulong c = 0;
AllocatedPage_t *busyPage = &busyPagesList;
if (!busyPage->next) {
return 0;
} else {
while(busyPage->next) {
busyPage = busyPage->next;
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c += 4096 + (busyPage->phyAddressEnd - busyPage->phyAddressBegin);
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}
}
return c;
}
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ulong MmGetTotalPageSize(void)
{
// Maximum PHYSICAL address in memory
ulong phRamSize = memoryMap.freeRamSize;
return ((phRamSize & 0xFFFFFFFFFF000) -
((MmPhysLastKernAddress + KPAGESIZE) & 0xFFFFFFFFFF000));
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}
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static void addPageToBusyList(void *phyPageAddrBegin, void *phyPageAddrEnd, ulong id)
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{
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AllocatedPage_t *busyPage = &busyPagesList;
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AllocatedPage_t *prevBusyPage = NULL;
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while(busyPage->next) {
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prevBusyPage = busyPage;
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busyPage = busyPage->next;
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if (busyPage->phyAddressBegin > phyPageAddrEnd) {
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busyPage = prevBusyPage;
break;
}
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}
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AllocatedPage_t *newBusyPage =
(AllocatedPage_t*)malloc(sizeof(AllocatedPage_t));
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newBusyPage->phyAddressBegin = phyPageAddrBegin;
newBusyPage->phyAddressEnd = phyPageAddrEnd;
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newBusyPage->id = id;
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newBusyPage->next = busyPage->next;
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busyPage->next = newBusyPage;
}
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static void removePageFromBusyList(void *phyPageAddrBegin)
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{
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AllocatedPage_t *busyPage = &busyPagesList;
AllocatedPage_t *prevBusyPage = NULL;
while(busyPage->next) {
prevBusyPage = busyPage;
busyPage = busyPage->next;
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if (phyPageAddrBegin == busyPage->phyAddressBegin) {
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prevBusyPage->next = busyPage->next;
free(busyPage);
break;
}
}
}
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//
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// Returns an id to identify a page frame allocated (kernel)
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//
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ulong MmAllocPageFrame(size_t size, bool contiguous)
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{
assert(size);
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static ulong id = 0;
ulong pageNumber = (((ulong)size) / KPAGESIZE) + 1;
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ulong curNumber = 0;
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void *futureBegin = 0;
void *futureEnd = 0;
ulong busyLastAddr = 0;
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// Incrementing id
id++;
// Maximum PHYSICAL address in memory
ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
DebugLog("Allocating %d pages (%u o)...\n", pageNumber, size);
// Through the pages in physical memory...
for (void *curPage = (void*)((MmPhysLastKernAddress + KPAGESIZE) & 0xFFFFFFFFFF000);
curPage < (void*)(phRamSize & 0xFFFFFFFFFF000); curPage += KPAGESIZE) {
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busyLastAddr = isPageBusy(curPage);
if (!busyLastAddr) {
if (!futureBegin) {
futureBegin = curPage;
//DebugLog("Select begin : %p\n", curPage);
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}
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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;
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}
}
}
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if (futureBegin && futureEnd)
addPageToBusyList(futureBegin, futureEnd, id);
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if (curNumber != pageNumber) {
return 0;
}
NSuccessfulAlloc++;
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return id;
}
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//
// Frees a page frame by its id
//
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void MmFreePageFrame(ulong id)
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{
assert(id);
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AllocatedPage_t *busyPage = &busyPagesList;
bool success = false;
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while(busyPage->next) {
busyPage = busyPage->next;
if (id == busyPage->id) {
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removePageFromBusyList(busyPage->phyAddressBegin);
success = true;
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}
}
if (success)
NSuccessfulFree++;
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}
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//
// Maps an allocated page frame to the given address
//
error_t MmMapPageFrame(ulong id, void *virtAddr, ulong flags)
{
assert(id);
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AllocatedPage_t *busyPage = &busyPagesList;
while(busyPage->next) {
busyPage = busyPage->next;
if (id == busyPage->id) {
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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;
}
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}
}
return EOK;
}
error_t MmUnmapPageFrame(ulong id)
{
assert(id);
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AllocatedPage_t *busyPage = &busyPagesList;
void *actualPhys = 0;
while(busyPage->next) {
busyPage = busyPage->next;
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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));
}
}
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}
}
return EOK;
}