matos/core/allocArea.c

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C
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#include "allocArea.h"
#include "alloc.h"
#include "assert.h"
#include "kernel.h"
#include "list.h"
#include "mem.h"
#include "stdarg.h"
static struct memArea *freeArea;
static struct memArea *usedArea;
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static int areaMergeFreeArea(struct memArea *prev, struct memArea *next);
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void areaInit(vaddr_t firstMemUsed, vaddr_t lastUsed, vaddr_t stackBottom, vaddr_t stackTop)
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{
list_init(freeArea);
list_init(usedArea);
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vaddr_t areaAddr, descAddr, entryAddr;
allocSetup(sizeof(struct memArea), &areaAddr, &descAddr, &entryAddr);
areaAdd(descAddr, descAddr + PAGE_SIZE, FALSE);
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if (entryAddr != descAddr)
areaAdd(entryAddr, entryAddr + PAGE_SIZE, FALSE);
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if (areaAddr != descAddr && areaAddr != entryAddr)
areaAdd(areaAddr, areaAddr + PAGE_SIZE, FALSE);
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//kernel bootstrap part
areaAdd(ALIGN_DOWN(firstMemUsed, PAGE_SIZE), stackBottom, FALSE);
//Initial kernel stack
areaAdd(stackBottom, stackTop, FALSE);
// Rest of kernel code
areaAdd(stackTop, lastUsed, FALSE);
// Rest of virtual mem is free
areaAdd(areaAddr + PAGE_SIZE, AREA_MEM_TOP, TRUE);
// Create allocBank for the rest of the system
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allocPopulate();
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}
struct memArea *areaFindFit(unsigned int nbPages)
{
struct memArea *area;
int count;
list_foreach(freeArea, area, count)
{
if (area->nbPages >= nbPages)
return area;
}
return NULL;
}
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static void insertSorted(struct memArea **list, struct memArea *item)
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{
struct memArea *prev, *cur;
int count;
prev = NULL;
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list_foreach(*list, cur, count)
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{
if (cur->startAddr > item->startAddr)
break;
prev = cur;
}
if (prev)
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list_insert_after(*list, prev, item);
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else
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list_add_tail(*list, item);
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}
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vaddr_t areaAlloc(unsigned int nbPages, uint32_t flags)
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{
struct memArea *area, *allocated;
area = areaFindFit(nbPages);
if (!area)
return (vaddr_t)NULL;
if (area->nbPages == nbPages) {
list_delete(freeArea, area);
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insertSorted(&usedArea, area);
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allocated = area;
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} else {
struct memArea *newArea = (struct memArea *)malloc(sizeof(struct memArea));
if (!newArea) {
pr_devel("Failed to allocated area of %d pages\n", nbPages);
return (vaddr_t)NULL;
}
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// Avoid insertSorted(freeArea, newArea) call by modifying area
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newArea->nbPages = nbPages;
newArea->startAddr = area->startAddr;
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area->nbPages -= nbPages;
area->startAddr += nbPages * PAGE_SIZE;
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insertSorted(&usedArea, newArea);
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allocated = newArea;
}
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if (flags & AREA_PHY_MAP) {
for (uint i = 0; i < nbPages; i++) {
paddr_t page = allocPhyPage(1);
if (page) {
pageMap(allocated->startAddr + i * PAGE_SIZE, page, PAGING_MEM_WRITE);
} else {
// TODO
assert(1);
}
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}
}
return allocated->startAddr;
}
int areaAdd(vaddr_t start, vaddr_t end, int isFree)
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{
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struct memArea **area;
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int nbPages = (end-start)/PAGE_SIZE;
assert(nbPages >0);
assert(IS_ALIGNED(start, PAGE_SIZE));
assert(IS_ALIGNED(end, PAGE_SIZE));
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struct memArea *newArea = (struct memArea *)malloc(sizeof(struct memArea));
if (!newArea)
return (vaddr_t)NULL;
newArea->nbPages = nbPages;
newArea->startAddr = start;
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if (isFree) {
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area = &freeArea;
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} else {
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area = &usedArea;
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}
insertSorted(area, newArea);
if (isFree) {
if (newArea->prev)
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areaMergeFreeArea(newArea->prev, *area);
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if (newArea->next)
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areaMergeFreeArea(*area, newArea->next);
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}
return 0;
}
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static int areaMergeFreeArea(struct memArea *prev, struct memArea *next)
{
if (prev->startAddr + prev->nbPages * PAGE_SIZE != next->startAddr) {
return -1;
}
prev->nbPages += next->nbPages;
list_delete(freeArea, next);
free(next);
next = prev;
return 0;
}
static struct memArea *areaFindMemArea(struct memArea *list, vaddr_t addr)
{
struct memArea *area;
int count;
list_foreach(list, area, count)
{
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if (area->startAddr <= addr && addr < area->startAddr + area->nbPages * PAGE_SIZE)
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return area;
}
return NULL;
}
int areaFree(vaddr_t addr)
{
struct memArea *area;
area = areaFindMemArea(usedArea, addr);
if (!area) {
pr_info("Cannot find memArea associated to %p\n", addr);
return -1;
}
for (uint i = 0; i < area->nbPages; i++) {
pageUnmap(area->startAddr + i * PAGE_SIZE);
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}
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list_delete(usedArea, area);
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insertSorted(&freeArea, area);
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if (area->prev)
areaMergeFreeArea(area->prev, area);
if (area->next)
areaMergeFreeArea(area, area->next);
return 0;
}