*
* Physical Memory Manager
*/
+#define DEBUG 0
#include <acess.h>
#include <mboot.h>
#include <mm_virt.h>
};
// === IMPORTS ===
-extern void gKernelBase;
-extern void gKernelEnd;
+extern char gKernelBase[];
+extern char gKernelEnd[];
// === PROTOTYPES ===
void MM_InitPhys_Multiboot(tMBoot_Info *MBoot);
int MM_int_GetRangeID( tPAddr Addr );
// === GLOBALS ===
-tSpinlock glPhysicalPages;
-Uint64 *gaSuperBitmap; // 1 bit = 64 Pages, 16 MiB Per Word
-Uint64 *gaMainBitmap; // 1 bit = 1 Page, 256 KiB per Word
-Uint64 *gaMultiBitmap; // Each bit means that the page is being used multiple times
+tMutex glPhysicalPages;
+Uint64 *gaSuperBitmap = (void*)MM_PAGE_SUPBMP; // 1 bit = 64 Pages, 16 MiB Per Word
+Uint64 *gaMainBitmap = (void*)MM_PAGE_BITMAP; // 1 bit = 1 Page, 256 KiB per Word
+Uint64 *gaMultiBitmap = (void*)MM_PAGE_DBLBMP; // Each bit means that the page is being used multiple times
Uint32 *gaiPageReferences = (void*)MM_PAGE_COUNTS; // Reference Counts
tPAddr giFirstFreePage; // First possibly free page
Uint64 giPhysRangeFree[NUM_MM_PHYS_RANGES]; // Number of free pages in each range
tVAddr vaddr;
tPAddr paddr, firstFreePage;
- Log("MM_InitPhys_Multiboot: (MBoot=%p)", MBoot);
+ ENTER("pMBoot=%p", MBoot);
// Scan the physical memory map
// Looking for the top of physical memory
mmapStart = (void *)( KERNEL_BASE | MBoot->MMapAddr );
- Log(" MM_InitPhys_Multiboot: mmapStart = %p", mmapStart);
+ LOG("mmapStart = %p", mmapStart);
ent = mmapStart;
while( (Uint)ent < (Uint)mmapStart + MBoot->MMapLength )
{
// Adjust for the size of the entry
ent->Size += 4;
- Log(" MM_InitPhys_Multiboot: ent={Type:%i,Base:0x%x,Length:%x",
+ LOG("ent={Type:%i,Base:0x%x,Length:%x",
ent->Type, ent->Base, ent->Length);
// If entry is RAM and is above `maxAddr`, change `maxAddr`
// Goodie, goodie gumdrops
giMaxPhysPage = maxAddr >> 12;
}
- Log(" MM_InitPhys_Multiboot: giMaxPhysPage = 0x%x", giMaxPhysPage);
+ LOG("giMaxPhysPage = 0x%x", giMaxPhysPage);
// Find a contigous section of memory to hold it in
// - Starting from the end of the kernel
superPages = ((giMaxPhysPage+64*8-1)/(64*8) + 0xFFF) >> 12;
numPages = (giMaxPhysPage + 7) / 8;
numPages = (numPages + 0xFFF) >> 12;
- Log(" MM_InitPhys_Multiboot: numPages = %i, superPages = %i",
- numPages, superPages);
+ LOG("numPages = %i, superPages = %i", numPages, superPages);
if(maxAddr == 0)
{
int todo = numPages*2 + superPages;
if( ent->Base + ent->Size < (tPAddr)&gKernelBase )
continue;
- Log(" MM_InitPhys_Multiboot: %x <= %x && %x > %x",
+ LOG("%x <= %x && %x > %x",
ent->Base, (tPAddr)&gKernelBase,
ent->Base + ent->Size, (tPAddr)&gKernelEnd - KERNEL_BASE
);
// Save the current value of paddr to simplify the allocation later
firstFreePage = paddr;
- Log(" MM_InitPhys_Multiboot: Clearing multi bitmap");
+ LOG("Clearing multi bitmap");
// Fill the bitmaps
- memset(gaMultiBitmap, 0, numPages<<12);
+ memset(gaMultiBitmap, 0, (numPages<<12)/8);
// - initialise to one, then clear the avaliable areas
- memset(gaMainBitmap, -1, numPages<<12);
- Log(" MM_InitPhys_Multiboot: Setting main bitmap");
+ memset(gaMainBitmap, -1, (numPages<<12)/8);
+ memset(gaSuperBitmap, -1, (numPages<<12)/(8*64));
+ LOG("Setting main bitmap");
// - Clear all Type=1 areas
- Log(" MM_InitPhys_Multiboot: Clearing valid regions");
+ LOG("Clearing valid regions");
for(
ent = mmapStart;
(Uint)ent < (Uint)mmapStart + MBoot->MMapLength;
size = ent->Size >> 12;
if(base & 63) {
- Uint64 val = -1 << (base & 63);
+ Uint64 val = -1LL << (base & 63);
gaMainBitmap[base / 64] &= ~val;
size -= (base & 63);
base += 64 - (base & 63);
}
memset( &gaMainBitmap[base / 64], 0, size/8 );
if( size & 7 ) {
- Uint64 val = -1 << (size & 7);
+ Uint64 val = -1LL << (size & 7);
val <<= (size/8)&7;
gaMainBitmap[base / 64] &= ~val;
}
size = (size + (base & 63) + 63) >> 6;
base = base >> 6;
if(base & 63) {
- Uint64 val = -1 << (base & 63);
+ Uint64 val = -1LL << (base & 63);
gaSuperBitmap[base / 64] &= ~val;
size -= (base & 63);
base += 64 - (base & 63);
size = firstFreePage >> 12;
memset( &gaMainBitmap[base / 64], -1, size/8 );
if( size & 7 ) {
- Uint64 val = -1 << (size & 7);
+ Uint64 val = -1LL << (size & 7);
val <<= (size/8)&7;
gaMainBitmap[base / 64] |= val;
}
if(gaiStaticAllocPages[i] != 0)
continue;
gaMainBitmap[ gaiStaticAllocPages[i] >> (12+6) ]
- &= ~(1 << ((gaiStaticAllocPages[i]>>12)&63));
+ &= ~(1LL << ((gaiStaticAllocPages[i]>>12)&63));
}
// Fill the super bitmap
- Log(" MM_InitPhys_Multiboot: Filling super bitmap");
+ LOG("Filling super bitmap");
memset(gaSuperBitmap, 0, superPages<<12);
for( base = 0; base < (size+63)/64; base ++)
{
- if( gaMainBitmap[ base ] == -1 )
- gaSuperBitmap[ base/64 ] |= 1 << (base&63);
+ if( gaMainBitmap[ base ] + 1 == 0 )
+ gaSuperBitmap[ base/64 ] |= 1LL << (base&63);
}
// Set free page counts
{
int rangeID;
// Skip allocated
- if( gaMainBitmap[ base >> 6 ] & (1 << (base&63)) ) continue;
+ if( gaMainBitmap[ base >> 6 ] & (1LL << (base&63)) ) continue;
// Get range ID
rangeID = MM_int_GetRangeID( base << 12 );
// updated anymore, hence will be correct)
giPhysRangeLast[ rangeID ] = base;
}
+
+ LEAVE('-');
}
/**
* \brief Allocate a contiguous range of physical pages with a maximum
- * bit size of \a Bits
- * \param Num Number of pages to allocate
- * \param Bits Maximum size of the physical address
- * \note If \a Bits is <= 0, any sized address is used (with preference
+ * bit size of \a MaxBits
+ * \param Pages Number of pages to allocate
+ * \param MaxBits Maximum size of the physical address
+ * \note If \a MaxBits is <= 0, any sized address is used (with preference
* to higher addresses)
*/
-tPAddr MM_AllocPhysRange(int Num, int Bits)
+tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
{
- tPAddr addr;
+ tPAddr addr, ret;
int rangeID;
int nFree = 0, i;
- Log("MM_AllocPhysRange: (Num=%i,Bits=%i)", Num, Bits);
+ ENTER("iPages iBits", Pages, MaxBits);
- if( Bits <= 0 || Bits >= 64 ) // Speedup for the common case
+ if( MaxBits <= 0 || MaxBits >= 64 ) // Speedup for the common case
rangeID = MM_PHYS_MAX;
else
- rangeID = MM_int_GetRangeID( (1 << Bits) -1 );
+ rangeID = MM_int_GetRangeID( (1LL << MaxBits) - 1 );
- Log(" MM_AllocPhysRange: rangeID = %i", rangeID);
+ LOG("rangeID = %i", rangeID);
- LOCK(&glPhysicalPages);
- Log(" MM_AllocPhysRange: i has lock");
+ Mutex_Acquire(&glPhysicalPages);
// Check if the range actually has any free pages
while(giPhysRangeFree[rangeID] == 0 && rangeID)
rangeID --;
- Log(" MM_AllocPhysRange: rangeID = %i", rangeID);
+ LOG("rangeID = %i", rangeID);
// What the? Oh, man. No free pages
if(giPhysRangeFree[rangeID] == 0) {
- RELEASE(&glPhysicalPages);
+ Mutex_Release(&glPhysicalPages);
// TODO: Page out
// ATM. Just Warning
Warning(" MM_AllocPhysRange: Out of free pages");
Log_Warning("Arch",
"Out of memory (unable to fulfil request for %i pages), zero remaining",
- Num
+ Pages
);
+ LEAVE('i', 0);
return 0;
}
// Check if there is enough in the range
- if(giPhysRangeFree[rangeID] >= Num)
+ if(giPhysRangeFree[rangeID] >= Pages)
{
- Log(" MM_AllocPhysRange: {%i,0x%x -> 0x%x}",
+ LOG("{%i,0x%x -> 0x%x}",
giPhysRangeFree[rangeID],
giPhysRangeFirst[rangeID], giPhysRangeLast[rangeID]
);
{
//Log(" MM_AllocPhysRange: addr = 0x%x", addr);
// Check the super bitmap
- if( gaSuperBitmap[addr >> (6+6)] == -1 ) {
- Log(" MM_AllocPhysRange: nFree = %i = 0 (super) (0x%x)", nFree, addr);
+ if( gaSuperBitmap[addr >> (6+6)] + 1 == 0 ) {
+ LOG("nFree = %i = 0 (super) (0x%x)", nFree, addr);
nFree = 0;
- addr += 1 << (6+6);
- addr &= (1 << (6+6)) - 1;
+ addr += 1LL << (6+6);
+ addr &= ~0xFFF; // (1LL << 6+6) - 1
continue;
}
// Check page block (64 pages)
- if( gaSuperBitmap[addr >> (6+6)] & (1 << (addr>>6)&63)) {
- Log(" MM_AllocPhysRange: nFree = %i = 0 (main) (0x%x)", nFree, addr);
+ if( gaMainBitmap[addr >> 6] + 1 == 0) {
+ LOG("nFree = %i = 0 (main) (0x%x)", nFree, addr);
nFree = 0;
- addr += 1 << (12+6);
- addr &= (1 << (12+6)) - 1;
+ addr += 1LL << (6);
+ addr &= ~0x3F;
continue;
}
// Check individual page
- if( gaMainBitmap[addr >> 6] & (1 << (addr & 63)) ) {
- Log(" MM_AllocPhysRange: nFree = %i = 0 (page) (0x%x)", nFree, addr);
+ if( gaMainBitmap[addr >> 6] & (1LL << (addr & 63)) ) {
+ LOG("nFree = %i = 0 (page) (0x%x)", nFree, addr);
nFree = 0;
addr ++;
continue;
}
nFree ++;
addr ++;
- Log(" MM_AllocPhysRange: nFree(%i) == %i (0x%x)", nFree, Num, addr);
+ LOG("nFree(%i) == %i (0x%x)", nFree, Pages, addr);
if(nFree == Num)
break;
}
- Log(" MM_AllocPhysRange: nFree = %i", nFree);
+ LOG("nFree = %i", nFree);
// If we don't find a contiguous block, nFree will not be equal
// to Num, so we set it to zero and do the expensive lookup.
- if(nFree != Num) nFree = 0;
+ if(nFree != Pages) nFree = 0;
}
if( !nFree )
nFree = 1;
addr = giPhysRangeLast[ rangeID ];
// TODO
- RELEASE(&glPhysicalPages);
+ Mutex_Release(&glPhysicalPages);
// TODO: Page out
// ATM. Just Warning
Warning(" MM_AllocPhysRange: Out of memory (unable to fulfil request for %i pages)", Num);
"Out of memory (unable to fulfil request for %i pages)",
Num
);
+ LEAVE('i', 0);
return 0;
}
- Log(" MM_AllocPhysRange: nFree = %i, addr = 0x%08x", nFree, addr);
+ LOG("nFree = %i, addr = 0x%08x", nFree, addr);
// Mark pages as allocated
- addr -= Num;
- for( i = 0; i < Num; i++ )
+ addr -= Pages;
+ for( i = 0; i < Pages; i++, addr++ )
{
- gaMainBitmap[addr >> 6] |= 1 << (addr & 63);
- rangeID = MM_int_GetRangeID(addr);
+ gaMainBitmap[addr >> 6] |= 1LL << (addr & 63);
+ rangeID = MM_int_GetRangeID(addr << 12);
giPhysRangeFree[ rangeID ] --;
+ LOG("%x == %x", addr, giPhysRangeFirst[ rangeID ]);
+ if(addr == giPhysRangeFirst[ rangeID ])
+ giPhysRangeFirst[ rangeID ] += 1;
}
+ ret = addr; // Save the return address
// Update super bitmap
- Num += addr & (64-1);
+ Pages += addr & (64-1);
addr &= ~(64-1);
- Num = (Num + (64-1)) & ~(64-1);
- for( i = 0; i < Num/64; i++ )
+ Pages = (Pages + (64-1)) & ~(64-1);
+ for( i = 0; i < Pages/64; i++ )
{
- if( gaMainBitmap[ addr >> 6 ] == -1 )
- gaSuperBitmap[addr>>12] |= 1 << ((addr >> 6) & 64);
+ if( gaMainBitmap[ addr >> 6 ] + 1 == 0 )
+ gaSuperBitmap[addr>>12] |= 1LL << ((addr >> 6) & 63);
}
- RELEASE(&glPhysicalPages);
- Log("MM_AllocPhysRange: RETURN %x", addr << 12);
- return addr << 12;
+ Mutex_Release(&glPhysicalPages);
+ LEAVE('x', ret << 12);
+ return ret << 12;
}
/**
if( PAddr >> 12 > giMaxPhysPage ) return ;
- if( gaMainBitmap[ page >> 6 ] & (1 << (page&63)) )
+ if( gaMainBitmap[ page >> 6 ] & (1LL << (page&63)) )
{
// Reference again
- gaMultiBitmap[ page >> 6 ] |= 1 << (page&63);
+ gaMultiBitmap[ page >> 6 ] |= 1LL << (page&63);
gaiPageReferences[ page ] ++;
}
else
{
// Allocate
- gaMainBitmap[page >> 6] |= 1 << (page&63);
- if( gaMainBitmap[page >> 6 ] == -1 )
- gaSuperBitmap[page>> 12] |= 1 << ((page >> 6) & 63);
+ gaMainBitmap[page >> 6] |= 1LL << (page&63);
+ if( gaMainBitmap[page >> 6 ] + 1 == 0 )
+ gaSuperBitmap[page>> 12] |= 1LL << ((page >> 6) & 63);
}
}
if( PAddr >> 12 > giMaxPhysPage ) return ;
- if( gaMultiBitmap[ page >> 6 ] & (1 << (page&63)) ) {
+ if( gaMultiBitmap[ page >> 6 ] & (1LL << (page&63)) ) {
gaiPageReferences[ page ] --;
if( gaiPageReferences[ page ] == 1 )
- gaMultiBitmap[ page >> 6 ] &= ~(1 << (page&63));
+ gaMultiBitmap[ page >> 6 ] &= ~(1LL << (page&63));
if( gaiPageReferences[ page ] == 0 )
- gaMainBitmap[ page >> 6 ] &= ~(1 << (page&63));
+ gaMainBitmap[ page >> 6 ] &= ~(1LL << (page&63));
}
else
- gaMainBitmap[ page >> 6 ] &= ~(1 << (page&63));
+ gaMainBitmap[ page >> 6 ] &= ~(1LL << (page&63));
- // TODO: Update free counts
- if( !(gaMainBitmap[ page >> 6 ] & (1 << (page&63))) )
+ // Update the free counts if the page was freed
+ if( !(gaMainBitmap[ page >> 6 ] & (1LL << (page&63))) )
{
int rangeID;
rangeID = MM_int_GetRangeID( PAddr );
giPhysRangeFree[ rangeID ] ++;
+ if( giPhysRangeFirst[rangeID] > page )
+ giPhysRangeFirst[rangeID] = page;
+ if( giPhysRangeLast[rangeID] < page )
+ giPhysRangeLast[rangeID] = page;
}
- if(gaMainBitmap[ page >> 6 ] == 0) {
- gaSuperBitmap[page >> 12] &= ~(1 << ((page >> 6) & 63));
+ // If the bitmap entry is not -1, unset the bit in the super bitmap
+ if(gaMainBitmap[ page >> 6 ] + 1 != 0 ) {
+ gaSuperBitmap[page >> 12] &= ~(1LL << ((page >> 6) & 63));
}
}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au