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//
// Created by mart on 4/23/20.
//
#include "os_alloc.h"
#include "consts.h"
#include "os_system.h"
extern Cell* DLInsert(Cell* list, Cell* cell);
extern Cell* DLAddFront(Cell* list, Cell* cell);
void* OSiHeapInfo[OS_ARENA_MAX] = {
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
#ifdef MATCH_ASM
asm static Cell* DLExtract(Cell* list, Cell* cell)
{
ldr r3, [r1, #0x4]
cmp r3, #0x0
ldrne r2, [r1, #0x0]
strne r2, [r3, #0x0]
ldr r2, [r1, #0x0]
cmp r2, #0x0
ldreq r0, [r1, #0x4]
ldrne r1, [r1, #0x4]
strne r1, [r2, #0x4]
bx lr
}
#else
static Cell* DLExtract(Cell* list, Cell* cell)
{
if (cell->next) {
cell->prev = cell->next->prev;
}
if (cell->prev) {
cell->prev->next = cell->next;
return list;
}
else {
return cell->next;
}
}
#endif
#define HEADERSIZE OSi_ROUND(sizeof(Cell), 32)
#define MINOBJSIZE (HEADERSIZE+32)
#ifdef MATCH_ASM
asm void OS_FreeToHeap(OSArenaId id, OSHeapHandle heap, void* ptr) {
stmdb sp!, {r4-r7, lr}
sub sp,sp,#0x4
mov r7,r0
mov r5,r1
mov r4,r2
bl OS_DisableInterrupts
ldr r1,=OSiHeapInfo
mov r6,r0
ldr r0,[r1,r7,lsl #0x2]
cmp r5,#0x0
ldrlt r5,[r0,#0x0]
ldr r1,[r0,#0x10]
mov r0,#0xc
mla r7,r5,r0,r1
sub r4,r4,#0x20
ldr r0,[r7,#0x8]
mov r1,r4
bl DLExtract
str r0,[r7,#0x8]
ldr r0,[r7,#0x4]
mov r1,r4
bl DLInsert
str r0,[r7,#0x4]
mov r0,r6
bl OS_RestoreInterrupts
add sp,sp,#0x4
ldmia sp!,{ r4-r7, lr }
bx lr
}
#else
void OS_FreeToHeap(OSArenaId id, OSHeapHandle heap, void* ptr) {
OSHeapInfo *heapInfo;
HeapDesc *hd;
Cell *cell;
OSIntrMode enabled = OS_DisableInterrupts();
heapInfo = OSiHeapInfo[id];
if (heap < 0) {
heap = heapInfo->currentHeap;
}
cell = (Cell *) ((char *)ptr - HEADERSIZE);
hd = &heapInfo->heapArray[heap];
hd->allocated = DLExtract(hd->allocated, cell);
hd->free = DLInsert(hd->free, cell);
OS_RestoreInterrupts(enabled);
}
#endif
#ifdef MATCH_ASM
asm void* OS_AllocFromHeap(OSArenaId id, OSHeapHandle heap, u32 size) {
stmdb sp!, {r4-r7,lr}
sub sp, sp, #0x4
mov r6, r0
mov r5, r1
mov r7, r2
bl OS_DisableInterrupts
ldr r1, =OSiHeapInfo
mov r4, r0
ldr r1, [r1, r6, lsl #0x2]
cmp r1, #0x0
bne _020CC7AC
bl OS_RestoreInterrupts
add sp, sp, #0x4
mov r0, #0x0
ldmia sp!, {r4-r7,lr}
bx lr
_020CC7AC:
cmp r5, #0x0
ldrlt r5, [r1, #0x0]
ldr r1, [r1, #0x10]
mov r0, #0xc
mla r6, r5, r0, r1
ldr r0, [r6, #0x4]
add r1, r7, #0x20
add r1, r1, #0x1f
mov r5, r0
cmp r0, #0x0
bic r7, r1, #0x1f
beq _020CC7F4
_020CC7DC:
ldr r1, [r5, #0x8]
cmp r7, r1
ble _020CC7F4
ldr r5, [r5, #0x4]
cmp r5, #0x0
bne _020CC7DC
_020CC7F4:
cmp r5, #0x0
bne _020CC814
mov r0, r4
bl OS_RestoreInterrupts
add sp, sp, #0x4
mov r0, #0x0
ldmia sp!, {r4-r7,lr}
bx lr
_020CC814:
ldr r1, [r5, #0x8]
sub r1, r1, r7
cmp r1, #0x40
bhs _020CC834
mov r1, r5
bl DLExtract
str r0, [r6, #0x4]
b _020CC86C
_020CC834:
str r7, [r5, #0x8]
add r2, r5, r7
str r1, [r2, #0x8]
ldr r0, [r5, #0x0]
str r0, [r5, r7]
ldr r0, [r5, #0x4]
str r0, [r2, #0x4]
ldr r0, [r2, #0x4]
cmp r0, #0x0
strne r2, [r0, #0x0]
ldr r0, [r2, #0x0]
cmp r0, #0x0
strne r2, [r0, #0x4]
streq r2, [r6, #0x4]
_020CC86C:
ldr r0, [r6, #0x8]
mov r1, r5
bl DLAddFront
str r0, [r6, #0x8]
mov r0, r4
bl OS_RestoreInterrupts
add r0, r5, #0x20
add sp, sp, #0x4
ldmia sp!, {r4-r7,lr}
bx lr
}
#else
void* OS_AllocFromHeap(OSArenaId id, OSHeapHandle heap, u32 size) {
OSHeapInfo* heapInfo;
HeapDesc* hd;
Cell* cell;
Cell* newCell;
long leftoverSize;
OSIntrMode enabled = OS_DisableInterrupts();
heapInfo = OSiHeapInfo[id];
if (!heapInfo) {
OS_RestoreInterrupts(enabled);
return NULL;
}
if (heap < 0) {
heap = heapInfo->currentHeap;
}
hd = &heapInfo->heapArray[heap];
size += HEADERSIZE;
size = OSi_ROUND(size, 32);
for (cell = hd->free; cell != NULL; cell = cell->next) {
if ((long)size <= cell->size) {
break;
}
}
if (cell == NULL) {
OS_RestoreInterrupts(enabled);
return NULL;
}
leftoverSize = cell->size - (long)size;
if (leftoverSize < MINOBJSIZE) {
hd->free = DLExtract(hd->free, cell);
} else {
cell->size = (long)size;
newCell = (Cell *) ((char *)cell + size);
newCell->size = leftoverSize;
newCell->prev = cell->prev;
newCell->next = cell->next;
if (newCell->next != NULL) {
newCell->next->prev = newCell;
}
if (newCell->prev != NULL) {
newCell->prev->next = newCell;
} else {
hd->free = newCell;
}
}
hd->allocated = DLAddFront(hd->allocated, cell);
OS_RestoreInterrupts(enabled);
return (void *)((char *)cell + HEADERSIZE);
}
#endif
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