341 lines
10 KiB
C
341 lines
10 KiB
C
#include <kernel/chroma.h>
|
|
#include <kernel/system/heap.h>
|
|
#include <lainlib/lainlib.h>
|
|
|
|
/************************
|
|
*** Team Kitty, 2020 ***
|
|
*** Chroma ***
|
|
***********************/
|
|
|
|
/* This file contains functions for physical memory management.
|
|
*
|
|
* This is also called blocking, or block memory allocation.
|
|
* It mostly deals with the memory map handed to us by the bootloader.
|
|
*
|
|
* It is useful in virtual memory management, because it allows us to map one block of physical memory to one page of virtual memory.
|
|
*
|
|
* Most of the processing here is done with a bitwise mapping of blocks to allocations, normally called a memory bitmap.
|
|
* See heap.h for the implementation.
|
|
*
|
|
* This file also contains memory manipulation functions, like memset and memcpy.
|
|
* //TODO: replace these functions with SSE2 equivalent.
|
|
*
|
|
*/
|
|
|
|
|
|
#define MIN_ORDER 3
|
|
#define PEEK(type, address) (*((volatile type*)(address)))
|
|
|
|
uint8_t* Memory = ((uint8_t*)(&memstart));
|
|
uint8_t* MemoryStart;
|
|
size_t MemoryBuckets;
|
|
|
|
static buddy_t LowBuddy = {
|
|
.MaxOrder = 32,
|
|
.Base = (directptr_t) DIRECT_REGION,
|
|
.List = (directptr_t[32 - MIN_ORDER]) {0},
|
|
.Lock = {0},
|
|
};
|
|
|
|
static buddy_t HighBuddy = {
|
|
.MaxOrder = 64,
|
|
.Base = 0,
|
|
.List = (directptr_t[64 - MIN_ORDER]) {0},
|
|
.Lock = {0},
|
|
};
|
|
|
|
static size_t MemoryLength;
|
|
|
|
static bool CheckBuddies(buddy_t* Buddy, directptr_t InputA, directptr_t InputB, size_t Size) {
|
|
size_t LowerBuddy = MIN(CAST(size_t, InputA), CAST(size_t, InputB)) - (size_t) Buddy->Base;
|
|
size_t HigherBuddy = MAX(CAST(size_t, InputA), CAST(size_t, InputB)) - (size_t) Buddy->Base;
|
|
|
|
return (LowerBuddy ^ Size) == HigherBuddy;
|
|
}
|
|
|
|
static void AddToBuddyList(buddy_t* Buddy, directptr_t Address, size_t Order, bool NewEntry) {
|
|
directptr_t ListHead = Buddy->List[Order - MIN_ORDER];
|
|
|
|
//SerialPrintf("Adding new entry to buddy: Address 0x%p with order %d, New Entry is %s\r\n", Address, Order, NewEntry ? "true" : "false");
|
|
|
|
/*
|
|
SerialPrintf("About to poke memory..\r\n");
|
|
PEEK(directptr_t, Address) = 0;
|
|
SerialPrintf("Did it work?\r\n");
|
|
*/
|
|
|
|
size_t Size = 1ull << Order;
|
|
|
|
TicketAttemptLock(&Buddy->Lock);
|
|
|
|
//SerialPrintf("Ticketlock engaged\r\n");
|
|
|
|
if(!NewEntry && ListHead != 0) {
|
|
directptr_t ListPrevious = 0;
|
|
|
|
while(true) {
|
|
if(CheckBuddies(Buddy, ListHead, Address, Size)) {
|
|
if(ListPrevious != 0) {
|
|
PEEK(directptr_t, ListPrevious) = PEEK(directptr_t, ListHead);
|
|
} else
|
|
Buddy->List[Order - MIN_ORDER] = PEEK(directptr_t, ListHead);
|
|
|
|
AddToBuddyList(Buddy, MIN(ListHead, Address), Order + 1, false);
|
|
break;
|
|
}
|
|
|
|
if(PEEK(directptr_t, ListHead) == 0) {
|
|
PEEK(directptr_t, ListHead) = Address;
|
|
break;
|
|
}
|
|
|
|
ListPrevious = ListHead;
|
|
ListHead = PEEK(directptr_t, ListHead);
|
|
}
|
|
} else {
|
|
//SerialPrintf("\tAbout to poke memory 0x%p - current value is 0x%x\r\n", Address, *((size_t*)(Address)));
|
|
*((size_t*)(Address)) = (size_t) ListHead;
|
|
Buddy->List[Order - MIN_ORDER] = Address;
|
|
}
|
|
|
|
TicketUnlock(&Buddy->Lock);
|
|
|
|
//SerialPrintf("Ticketlock Released.\r\n");
|
|
}
|
|
|
|
static void AddRangeToBuddy(buddy_t* Buddy, directptr_t Base, size_t Size) {
|
|
//SerialPrintf("Starting a new range addition.\r\n\t");
|
|
while(Size > (1ull << MIN_ORDER)) {
|
|
//SerialPrintf("New iteration. Current Size: 0x%x\r\n\t", Size);
|
|
for(int Order = Buddy->MaxOrder - 1; Order >= MIN_ORDER; Order--) {
|
|
//SerialPrintf("New Loop. Current Order: %d\r\n\t", Order);
|
|
if(Size >= (1ull << Order)) {
|
|
//SerialPrintf("\tNew loop check passed.\r\n\t");
|
|
AddToBuddyList(Buddy, Base, Order, true);
|
|
//SerialPrintf("\tEntry added to current buddy. Moving onto memory operations..\r\n\t");
|
|
Base = (void*)((((char*)Base) + (1ull << Order)));
|
|
Size -= 1ull << Order;
|
|
//SerialPrintf("\tMemory operations complete. Moving onto next iteration.\r\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static directptr_t BuddyAllocate(buddy_t* Buddy, size_t Size) {
|
|
int InitialOrder = MAX((64 - CLZ(Size - 1)), MIN_ORDER);
|
|
|
|
size_t WantedSize = 1ull << InitialOrder;
|
|
|
|
if(InitialOrder >= Buddy->MaxOrder) {
|
|
SerialPrintf("Tried to allocate too much physical memory for buddy 0x%p\r\n", Buddy);
|
|
SerialPrintf("Buddy 0x%p has max order %d, but 0x%x bytes was requested.\r\nInitial Order: %d, Wanted Size: 0x%x\r\n", Buddy, Buddy->MaxOrder, Size, InitialOrder, WantedSize);
|
|
return NULL;
|
|
}
|
|
|
|
TicketAttemptLock(&Buddy->Lock);
|
|
|
|
//SerialPrintf("Searching for a valid order to allocate into. Condition: {\r\n\tOrder: %d,\r\n\tSize: 0x%x\r\n}\r\n\n", InitialOrder, WantedSize);
|
|
|
|
for(int Order = InitialOrder; Order < Buddy->MaxOrder; Order++) {
|
|
//SerialPrintf("\tCurrent Order: %d, Buddy entry: %x\r\n", Order, Buddy->List[Order - MIN_ORDER]);
|
|
if(Buddy->List[Order - MIN_ORDER] != 0) {
|
|
//SerialPrintf("\tFound a valid Order!\r\n");
|
|
directptr_t Address = Buddy->List[Order - MIN_ORDER];
|
|
Buddy->List[Order - MIN_ORDER] = PEEK(directptr_t, Address);
|
|
TicketUnlock(&Buddy->Lock);
|
|
|
|
size_t FoundSize = 1ull << Order;
|
|
|
|
//SerialPrintf("\tAdding area - Address 0x%p, Size 0x%x\r\n\n", Address, FoundSize);
|
|
|
|
AddRangeToBuddy(Buddy, (void*)((size_t)Address + WantedSize), FoundSize - WantedSize);
|
|
|
|
//SerialPrintf("\tArea added!\r\n");
|
|
return Address;
|
|
}
|
|
}
|
|
|
|
//SerialPrintf("BuddyAllocate: Unable to find a valid order to allocate!\r\nInitial Order: %d, WantedSize: 0x%x\r\n\r\n", InitialOrder, WantedSize);
|
|
|
|
TicketUnlock(&Buddy->Lock);
|
|
return NULL;
|
|
}
|
|
|
|
void InitMemoryManager() {
|
|
|
|
SerialPrintf("[ Mem] Counting memory..\r\n");
|
|
|
|
MemorySize = 0;
|
|
size_t MemMapEntryCount = 0;
|
|
|
|
MMapEnt* MemMap = &bootldr.mmap;
|
|
|
|
while((size_t) MemMap < ((size_t) &bootldr) + bootldr.size) {
|
|
if(MMapEnt_IsFree(MemMap)) {
|
|
MemorySize += MMapEnt_Size(MemMap);
|
|
}
|
|
MemMapEntryCount++;
|
|
MemMap++;
|
|
}
|
|
|
|
SerialPrintf("[ Mem] Counted %d entries in the memory map..\r\n", MemMapEntryCount);
|
|
|
|
MemoryPages = MemorySize / PAGE_SIZE;
|
|
|
|
SerialPrintf("[ Mem] %u MB of memory detected.\r\n", (MemorySize / 1024) / 1024);
|
|
}
|
|
|
|
|
|
void ListMemoryMap() {
|
|
|
|
SerialPrintf("[ Mem] BIOS-Provided memory map:\r\n");
|
|
|
|
|
|
for(MMapEnt* MapEntry = &bootldr.mmap; (size_t)MapEntry < (size_t) &bootldr + bootldr.size; MapEntry++) {
|
|
char EntryType[8] = {0};
|
|
switch(MMapEnt_Type(MapEntry)) {
|
|
case MMAP_FREE:
|
|
memcpy(EntryType, "FREE", 5);
|
|
break;
|
|
case MMAP_USED:
|
|
memcpy(EntryType, "RESERVED", 8);
|
|
break;
|
|
case MMAP_ACPI:
|
|
memcpy(EntryType, "ACPI", 4);
|
|
break;
|
|
case MMAP_MMIO:
|
|
memcpy(EntryType, "MMIO", 4);
|
|
break;
|
|
}
|
|
|
|
size_t entry_from = MMapEnt_Ptr(MapEntry);
|
|
size_t entry_to = MMapEnt_Ptr(MapEntry) + MMapEnt_Size(MapEntry);
|
|
|
|
|
|
if(entry_from != 0 && entry_to != 0)
|
|
SerialPrintf("[ Mem] 0x%p-0x%p %s\r\n", entry_from, entry_to, EntryType);
|
|
|
|
if(MMapEnt_Type(MapEntry) == MMAP_FREE) {
|
|
SerialPrintf("[ Mem] Adding this entry to the physical memory manager!\r\n");
|
|
AddRangeToPhysMem((void*)((char*)(MMapEnt_Ptr(MapEntry) /* + DIRECT_REGION*/ )), MMapEnt_Size(MapEntry));
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void AddRangeToPhysMem(directptr_t Base, size_t Size) {
|
|
if(Base < (void*)(LOWER_REGION + DIRECT_REGION)) {
|
|
SerialPrintf("[ Mem] New range in lower memory: 0x%p, size 0x%x\r\n", Base, Size);
|
|
AddRangeToBuddy(&LowBuddy, Base, Size);
|
|
} else {
|
|
if(HighBuddy.Base == NULL) {
|
|
HighBuddy.Base = Base;
|
|
}
|
|
|
|
AddRangeToBuddy(&HighBuddy, Base, Size);
|
|
}
|
|
|
|
if(MemoryLength < AlignUpwards((size_t)Base + Size, PAGE_SIZE) / PAGE_SIZE) {
|
|
MemoryLength = AlignUpwards((size_t)Base + Size, PAGE_SIZE) / PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
directptr_t PhysAllocateLowMem(size_t Size) {
|
|
directptr_t Pointer = BuddyAllocate(&LowBuddy, Size);
|
|
ASSERT(Pointer != NULL, "PhysAllocateLowMem: Allocation failed!");
|
|
|
|
return Pointer;
|
|
}
|
|
|
|
directptr_t PhysAllocateMem(size_t Size) {
|
|
directptr_t Pointer = NULL;
|
|
|
|
if(HighBuddy.Base == 0) {
|
|
//SerialPrintf("Attempting allocation into high memory.\n");
|
|
Pointer = BuddyAllocate(&HighBuddy, Size);
|
|
}
|
|
|
|
if(Pointer == NULL) {
|
|
//SerialPrintf("Attempting allocation into low memory.\n");
|
|
Pointer = BuddyAllocate(&LowBuddy, Size);
|
|
}
|
|
|
|
ASSERT(Pointer != NULL, "PhysAllocateMem: Unable to allocate memory!");
|
|
|
|
return Pointer;
|
|
}
|
|
|
|
directptr_t PhysAllocateZeroMem(size_t Size) {
|
|
directptr_t Pointer = PhysAllocateMem(Size);
|
|
memset(Pointer, 0, Size);
|
|
return Pointer;
|
|
}
|
|
|
|
directptr_t PhysAllocateLowZeroMem(size_t Size) {
|
|
directptr_t Pointer = PhysAllocateLowMem(Size);
|
|
memset(Pointer, 0, Size);
|
|
return Pointer;
|
|
|
|
}
|
|
|
|
void PhysFreeMem(directptr_t Pointer, size_t Size) {
|
|
//ASSERT(Pointer >= (directptr_t) DIRECT_REGION, "PhysFreeMem: Attempting to free memory not in the direct mapping region.");
|
|
|
|
buddy_t* Buddy;
|
|
|
|
if(Pointer < (void*)(LOWER_REGION /* + DIRECT_REGION */))
|
|
Buddy = &LowBuddy;
|
|
else
|
|
Buddy = &HighBuddy;
|
|
|
|
int Order = MAX(64 - CLZ(Size - 1), MIN_ORDER);
|
|
AddToBuddyList(Buddy, Pointer, Order, false);
|
|
}
|
|
|
|
static _Atomic(uint16_t)* PageRefCount = NULL;
|
|
|
|
void PhysAllocatorInit() {
|
|
PageRefCount = PhysAllocateZeroMem(sizeof(uint16_t) * MemoryPages);
|
|
}
|
|
|
|
directptr_t PhysAllocatePage() {
|
|
directptr_t Page = PhysAllocateMem(PAGE_SIZE);
|
|
PhysRefPage(Page);
|
|
return Page;
|
|
}
|
|
|
|
void PhysRefPage(directptr_t Page) {
|
|
PageRefCount[(size_t) Page >> PAGE_SHIFT]++;
|
|
}
|
|
|
|
void PhysFreePage(directptr_t Page) {
|
|
if(--PageRefCount[(size_t)Page >> PAGE_SHIFT] == 0) {
|
|
PhysFreeMem(Page, PAGE_SIZE);
|
|
}
|
|
}
|
|
|
|
void* memcpy(void* dest, void const* src, size_t len) {
|
|
unsigned char* dst = (unsigned char*) dest;
|
|
const unsigned char* source = (const unsigned char*) src;
|
|
|
|
for(size_t i = 0; i < len; i++) {
|
|
dst[i] = source[i];
|
|
}
|
|
|
|
return dest;
|
|
}
|
|
|
|
void* memset(void* dst, int src, size_t len) {
|
|
unsigned char* buf = (unsigned char*) dst;
|
|
|
|
for(size_t i = 0; i < len; i++) {
|
|
buf[i] = (unsigned char) src;
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
|
|
|