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bootstrap alloc and area

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This commit is contained in:
Mathieu Maret 2021-08-09 09:26:10 +02:00
parent 5a078249d0
commit 31aaf10635
6 changed files with 83 additions and 18 deletions
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50
core/alloc.c
View File

@ -1,6 +1,7 @@
#define pr_fmt(fmt) "[alloc]: " fmt
//#define DEBUG
#include "alloc.h"
#include "assert.h"
#include "errno.h"
#include "irq.h"
#include "kernel.h"
@ -11,7 +12,6 @@
#include "paging.h"
#define IS_SELF_CONTAINED(desc) ((vaddr_t)((desc)->page) == (vaddr_t)(desc))
// Slab will contains object from sizeof(void *) to PAGE_SIZE/2 by pow2
static struct slabDesc *slub;
static int allocSlab(struct slabDesc **desc, size_t sizeEl, size_t sizeSlab,
@ -20,14 +20,13 @@ static int allocSlabEntry(struct slabEntry **desc, size_t sizeEl, size_t sizeSla
int selfContained);
static int formatPage(struct slabEntry *desc, size_t size, size_t sizeSlab, int selfContained);
static int freeFromSlab(void *ptr, struct slabEntry *slab);
static struct slabDesc *allocGetSlab(size_t size);
static struct {
size_t elementSize;
size_t slabSize;
unsigned char isSelf;
} initSlab[] = {{sizeof(struct slabDesc), PAGE_SIZE, 1},
{sizeof(struct slabEntry), PAGE_SIZE, 1},
{4, PAGE_SIZE, 0},
} initSlab[] = {{4, PAGE_SIZE, 0},
{8, PAGE_SIZE, 0},
{16, PAGE_SIZE, 0},
{32, PAGE_SIZE, 0},
@ -41,10 +40,22 @@ static struct {
{16384, 12 * PAGE_SIZE, 0},
{0, 0, 0}};
int allocSetup(void)
int allocSetup(size_t sizeOfArea, vaddr_t *areaAddr, vaddr_t *descAddr, vaddr_t *entryAddr)
{
list_init(slub);
assert(allocBookSlab(sizeof(struct slabDesc), PAGE_SIZE, TRUE) == 0);
*descAddr = (vaddr_t)allocGetSlab(sizeof(struct slabDesc));
assert(allocBookSlab(sizeof(struct slabEntry), PAGE_SIZE, TRUE) == 0);
*entryAddr = (vaddr_t)allocGetSlab(sizeof(struct slabEntry));
assert(allocBookSlab(sizeOfArea, PAGE_SIZE, TRUE) == 0);
*areaAddr = (vaddr_t)allocGetSlab(sizeOfArea);
return 0;
}
int allocPopulate()
{
for (uint i = 0; initSlab[i].elementSize != 0; i++) {
int ret;
@ -52,7 +63,7 @@ int allocSetup(void)
initSlab[i].isSelf))) {
if (ret == -EEXIST)
continue;
pr_devel("Fail to allocBookSlab %d for %d \n", ret, (1U << i));
pr_err("Fail to allocBookSlab %d for %d \n", ret, (1U << i));
return ret;
}
@ -125,7 +136,7 @@ static int allocSlab(struct slabDesc **desc, size_t size, size_t sizeSlab, int s
*desc = (struct slabDesc *)alloc;
((*desc)->slab).freeEl = (char *)(*desc) + sizeof(struct slabDesc);
} else {
*desc = malloc(sizeof(struct slabDesc));
*desc = malloc(sizeof(struct slabDesc));
if (*desc == NULL)
return -ENOMEM;
(*desc)->slab.freeEl = (void *)alloc;
@ -175,7 +186,7 @@ static int allocSlabEntry(struct slabEntry **desc, size_t size, size_t sizeSlab,
*desc = (struct slabEntry *)alloc;
(*desc)->freeEl = (char *)(*desc) + sizeof(struct slabEntry);
} else {
*desc = malloc(sizeof(struct slabEntry));
*desc = malloc(sizeof(struct slabEntry));
if (*desc == NULL)
return -ENOMEM;
(*desc)->freeEl = (void *)alloc;
@ -227,24 +238,31 @@ static void *allocFromSlab(struct slabEntry *slab)
return (void *)next;
}
static struct slabDesc *allocGetSlab(size_t size)
{
struct slabDesc *slab = NULL;
uint slubIdx;
list_foreach(slub, slab, slubIdx)
{
if (size <= slab->size)
return slab;
}
return NULL;
}
void *malloc(size_t size)
{
struct slabEntry *slabEntry;
struct slabDesc *slab = NULL;
uint slubIdx;
void *ret;
int flags;
int slabIdx;
disable_IRQs(flags);
list_foreach(slub, slab, slubIdx)
{
if (size <= slab->size)
break;
}
if (!list_foreach_early_break(slub, slab, slubIdx)) {
if ((slab = allocGetSlab(size)) == NULL) {
pr_devel("No slab found for %d\n", size);
return NULL;
}

3
core/alloc.h
View File

@ -5,8 +5,9 @@
/*
* Initialize malloc system
*/
int allocSetup(void);
int allocSetup(size_t sizeOfArea, vaddr_t *areaAddr, vaddr_t *descAddr, vaddr_t *entryAddr);
int allocPopulate();
/*
* Allow malloc to allocate elements of this precise size.
* Otherwise the allocation will be in the closest biggest pool.

41
core/allocArea.c
View File

@ -16,10 +16,21 @@ struct memArea {
static struct memArea *freeArea;
static struct memArea *usedArea;
static int areaMergeFreeArea(struct memArea *prev, struct memArea *next);
void areaInit(void)
{
list_init(freeArea);
list_init(usedArea);
vaddr_t areaAddr, descAddr, entryAddr;
allocSetup(sizeof(struct memArea), &areaAddr, &descAddr, &entryAddr);
areaAdd(descAddr, PAGE_SIZE, FALSE);
if (entryAddr != descAddr)
areaAdd(entryAddr, PAGE_SIZE, FALSE);
if (areaAddr != descAddr && areaAddr != entryAddr)
areaAdd(areaAddr, PAGE_SIZE, FALSE);
allocPopulate();
}
struct memArea *areaFindFit(unsigned int nbPages)
@ -96,6 +107,36 @@ vaddr_t areaAlloc(unsigned int nbPages)
return allocated->startAddr;
}
int areaAdd(vaddr_t addr, uint nbPages, int isFree)
{
struct memArea *area;
struct memArea *newArea = (struct memArea *)malloc(sizeof(struct memArea));
if (!newArea)
return (vaddr_t)NULL;
newArea->nbPages = nbPages;
newArea->startAddr = addr;
if (isFree) {
area = freeArea;
} else {
area = usedArea;
}
insertSorted(area, newArea);
if (isFree) {
if (newArea->prev)
areaMergeFreeArea(newArea->prev, area);
if (newArea->next)
areaMergeFreeArea(area, newArea->next);
}
return 0;
}
static int areaMergeFreeArea(struct memArea *prev, struct memArea *next)
{
if (prev->startAddr + prev->nbPages * PAGE_SIZE != next->startAddr) {

2
core/allocArea.h
View File

@ -1,6 +1,8 @@
#pragma once
#include "paging.h"
#include "stdarg.h"
void areaInit(void);
vaddr_t areaAlloc(unsigned int nbPages);
int areaFree(vaddr_t addr);
int areaAdd(vaddr_t addr, uint nbPages, int isFree);

1
core/klibc.h
View File

@ -51,3 +51,4 @@ int vasprintf(char **strp, const char *fmt, va_list ap);
#endif
#define pr_info(fmt, ...) printf(pr_fmt(fmt), ##__VA_ARGS__)
#define pr_err(fmt, ...) printf(pr_fmt(fmt), ##__VA_ARGS__)

4
core/main.c
View File

@ -1,4 +1,5 @@
#include "alloc.h"
#include "allocArea.h"
#include "exception.h"
#include "gdt.h"
#include "idt.h"
@ -143,7 +144,8 @@ void kmain(unsigned long magic, unsigned long addr)
serialSetup(115200);
printf("Setting up allocation system\n");
allocSetup();
areaInit();
//allocSetup();
printf("Setting up thread system\n");
kthreadSetup(_stack_bottom, (_stack_top - _stack_bottom + 1));