125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Page allocator related functions //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <kernel.h>
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#include <init/boot.h>
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#include <ex/malloc.h>
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#include <mm/paging.h>
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#include <mm/palloc.h>
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#include <io/vga.h>
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//---------
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enum
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{
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Whatever = 1UL << 52,
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Whatever2 = 1UL << 62
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};
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static AllocatedPage_t busyPagesList = { (void*)0, 0, (AllocatedPage_t*)0 };
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//---------
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static bool isPageBusy(void *phyPageAddr) {
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AllocatedPage_t *busyPage = &busyPagesList;
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bool isBusy = false;
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while(busyPage->next) {
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busyPage = busyPage->next;
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DebugLog("Busy page at %p\n", busyPage->phyAddress);
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if (phyPageAddr == busyPage->phyAddress) {
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isBusy = true;
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break;
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}
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}
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return isBusy;
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}
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static void addPageToBusyList(void *phyPageAddr, ulong id) {
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AllocatedPage_t *busyPage = &busyPagesList;
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while(busyPage->next) {
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busyPage = busyPage->next;
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}
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AllocatedPage_t *newBusyPage = (AllocatedPage_t*)malloc(sizeof(AllocatedPage_t));
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newBusyPage->phyAddress = phyPageAddr;
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newBusyPage->id = id;
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busyPage->next = newBusyPage;
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}
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static void removePageFromBusyList(void *phyPageAddr) {
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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 (phyPageAddr == busyPage->phyAddress) {
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prevBusyPage->next = busyPage->next;
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free(busyPage);
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break;
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}
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}
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}
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//
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// Returns a structure that describes a pageframe
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//
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error_t MmGetFreePageFrame(void **framePtr, size_t *pageNumber, size_t size) {
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*pageNumber = (ulong)size / KPAGESIZE;
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return EOK;
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}
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error_t MmTestBusyPage(void) {
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DebugLog("Adding pages \n");
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addPageToBusyList((void*)0x123456789, 56);
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addPageToBusyList((void*)0x555666666, 69);
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addPageToBusyList((void*)0x454545454, 5);
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DebugLog("\nVerifying busy 1\n");
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isPageBusy((void*)0x123456789);
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DebugLog("\nVerifying busy 2\n");
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isPageBusy((void*)0);
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DebugLog("\nVerifying busy 3\n");
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isPageBusy((void*)0x1234567894);
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DebugLog("\nRemoving first\n");
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removePageFromBusyList((void*)0x123456789);
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isPageBusy((void*)0x1234567894);
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DebugLog("\nRemoving others\n");
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removePageFromBusyList((void*)0x555666666);
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removePageFromBusyList((void*)0x454545454);
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isPageBusy((void*)0x1234567894);
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return EOK;
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}
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