*
* Physical Memory Manager
*/
+#define DEBUG 0
#include <acess.h>
#include <mboot.h>
#include <mm_virt.h>
};
// === IMPORTS ===
-extern void gKernelEnd;
+extern char gKernelBase[];
+extern char gKernelEnd[];
+
+// === PROTOTYPES ===
+void MM_InitPhys_Multiboot(tMBoot_Info *MBoot);
+tPAddr MM_AllocPhysRange(int Num, int Bits);
+tPAddr MM_AllocPhys(void);
+void MM_RefPhys(tPAddr PAddr);
+void MM_DerefPhys(tPAddr PAddr);
+ int MM_int_GetRangeID( tPAddr Addr );
// === GLOBALS ===
-tSpinlock glPhysicalPages;
-Uint64 *gaSuperBitmap; // 1 bit = 64 Pages
+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
Uint64 giPhysRangeFirst[NUM_MM_PHYS_RANGES]; // First free page in each range
Uint64 giPhysRangeLast[NUM_MM_PHYS_RANGES]; // Last free page in each range
Uint64 giMaxPhysPage = 0; // Maximum Physical page
+// Only used in init, allows the init code to provide pages for use by
+// the allocator before the bitmaps exist.
+// 3 entries because the are three calls to MM_AllocPhys in MM_Map
+#define NUM_STATIC_ALLOC 3
+tPAddr gaiStaticAllocPages[NUM_STATIC_ALLOC] = {0};
// === CODE ===
+/**
+ * \brief Initialise the physical memory map using a Multiboot 1 map
+ */
void MM_InitPhys_Multiboot(tMBoot_Info *MBoot)
{
tMBoot_MMapEnt *mmapStart;
tMBoot_MMapEnt *ent;
Uint64 maxAddr = 0;
- int numPages;
+ int numPages, superPages;
+ int i;
+ Uint64 base, size;
+ 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
// - We also need a region for the super bitmap
- numPages = (giMaxPhysPage + 7) * sizeof(*gaiPageReferences);
+ superPages = ((giMaxPhysPage+64*8-1)/(64*8) + 0xFFF) >> 12;
+ numPages = (giMaxPhysPage + 7) / 8;
numPages = (numPages + 0xFFF) >> 12;
- Log(" MM_InitPhys_Multiboot: numPages = %i", numPages);
+ LOG("numPages = %i, superPages = %i", numPages, superPages);
if(maxAddr == 0)
{
+ int todo = numPages*2 + superPages;
// Ok, naieve allocation, just put it after the kernel
- tVAddr vaddr = MM_PAGE_COUNTS;
- tPAddr paddr = (tPAddr)&gKernelEnd - KERNEL_BASE;
- while(numPages --)
+ // - Allocated Bitmap
+ vaddr = MM_PAGE_BITMAP;
+ paddr = (tPAddr)&gKernelEnd - KERNEL_BASE;
+ while(todo )
{
+ // Allocate statics
+ for( i = 0; i < NUM_STATIC_ALLOC; i++) {
+ if(gaiStaticAllocPages[i] != 0) continue;
+ gaiStaticAllocPages[i] = paddr;
+ paddr += 0x1000;
+ }
+
MM_Map(vaddr, paddr);
vaddr += 0x1000;
paddr += 0x1000;
+
+ todo --;
+
+ if( todo == numPages + superPages )
+ vaddr = MM_PAGE_DBLBMP;
+ if( todo == superPages )
+ vaddr = MM_PAGE_SUPBMP;
}
- // Allocate the super bitmap
- gaSuperBitmap = (void*) MM_MapHWPages(
- paddr,
- ((giMaxPhysPage+64*8-1)/(64*8) + 0xFFF) >> 12
- );
}
// Scan for a nice range
else
{
-
+ int todo = numPages*2 + superPages;
+ paddr = 0;
+ vaddr = MM_PAGE_BITMAP;
+ // Scan!
+ for(
+ ent = mmapStart;
+ (Uint)ent < (Uint)mmapStart + MBoot->MMapLength;
+ ent = (tMBoot_MMapEnt *)( (Uint)ent + ent->Size )
+ )
+ {
+ int avail;
+
+ // RAM only please
+ if( ent->Type != 1 )
+ continue;
+
+ // Let's not put it below the kernel, shall we?
+ if( ent->Base + ent->Size < (tPAddr)&gKernelBase )
+ continue;
+
+ LOG("%x <= %x && %x > %x",
+ ent->Base, (tPAddr)&gKernelBase,
+ ent->Base + ent->Size, (tPAddr)&gKernelEnd - KERNEL_BASE
+ );
+ // Check if the kernel is in this range
+ if( ent->Base <= (tPAddr)&gKernelBase
+ && ent->Base + ent->Length > (tPAddr)&gKernelEnd - KERNEL_BASE )
+ {
+ avail = ent->Length >> 12;
+ avail -= ((tPAddr)&gKernelEnd - KERNEL_BASE - ent->Base) >> 12;
+ paddr = (tPAddr)&gKernelEnd - KERNEL_BASE;
+ }
+ // No? then we can use all of the block
+ else
+ {
+ avail = ent->Length >> 12;
+ paddr = ent->Base;
+ }
+
+ Log(" MM_InitPhys_Multiboot: paddr=0x%x, avail=%i", paddr, avail);
+
+ // Map
+ while( todo && avail --)
+ {
+ // Static Allocations
+ for( i = 0; i < NUM_STATIC_ALLOC && avail; i++) {
+ if(gaiStaticAllocPages[i] != 0) continue;
+ gaiStaticAllocPages[i] = paddr;
+ paddr += 0x1000;
+ avail --;
+ }
+ if(!avail) break;
+
+ // Map
+ MM_Map(vaddr, paddr);
+ todo --;
+ vaddr += 0x1000;
+ paddr += 0x1000;
+
+ // Alter the destination address when needed
+ if(todo == superPages+numPages)
+ vaddr = MM_PAGE_DBLBMP;
+ if(todo == superPages)
+ vaddr = MM_PAGE_SUPBMP;
+ }
+
+ // Fast quit if there's nothing left to allocate
+ if( !todo ) break;
+ }
}
+ // Save the current value of paddr to simplify the allocation later
+ firstFreePage = paddr;
+ LOG("Clearing multi bitmap");
// Fill the bitmaps
+ memset(gaMultiBitmap, 0, (numPages<<12)/8);
// - initialise to one, then clear the avaliable areas
- memset(gaSuperBitmap, -1, (giMaxPhysPage+64*8-1)/(64*8));
- memset(gaiPageReferences, -1, giMaxPhysPage*sizeof(*gaiPageReferences));
+ memset(gaMainBitmap, -1, (numPages<<12)/8);
+ memset(gaSuperBitmap, -1, (numPages<<12)/(8*64));
+ LOG("Setting main bitmap");
// - Clear all Type=1 areas
+ LOG("Clearing valid regions");
for(
ent = mmapStart;
(Uint)ent < (Uint)mmapStart + MBoot->MMapLength;
{
// Check if the type is RAM
if(ent->Type != 1) continue;
- // Clear the range
- memset(
- &gaiPageReferences[ ent->Base >> 12 ],
- 0,
- (ent->Size>>12)*sizeof(*gaiPageReferences)
- );
+
+ // Main bitmap
+ base = ent->Base >> 12;
+ size = ent->Size >> 12;
+
+ if(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 = -1LL << (size & 7);
+ val <<= (size/8)&7;
+ gaMainBitmap[base / 64] &= ~val;
+ }
+
+ // Super Bitmap
+ base = ent->Base >> 12;
+ size = ent->Size >> 12;
+ size = (size + (base & 63) + 63) >> 6;
+ base = base >> 6;
+ if(base & 63) {
+ Uint64 val = -1LL << (base & 63);
+ gaSuperBitmap[base / 64] &= ~val;
+ size -= (base & 63);
+ base += 64 - (base & 63);
+ }
+ }
+
+ // Reference the used pages
+ base = (tPAddr)&gKernelBase >> 12;
+ size = firstFreePage >> 12;
+ memset( &gaMainBitmap[base / 64], -1, size/8 );
+ if( size & 7 ) {
+ Uint64 val = -1LL << (size & 7);
+ val <<= (size/8)&7;
+ gaMainBitmap[base / 64] |= val;
+ }
+
+ // Free the unused static allocs
+ for( i = 0; i < NUM_STATIC_ALLOC; i++) {
+ if(gaiStaticAllocPages[i] != 0)
+ continue;
+ gaMainBitmap[ gaiStaticAllocPages[i] >> (12+6) ]
+ &= ~(1LL << ((gaiStaticAllocPages[i]>>12)&63));
+ }
+
+ // Fill the super bitmap
+ LOG("Filling super bitmap");
+ memset(gaSuperBitmap, 0, superPages<<12);
+ for( base = 0; base < (size+63)/64; base ++)
+ {
+ if( gaMainBitmap[ base ] + 1 == 0 )
+ gaSuperBitmap[ base/64 ] |= 1LL << (base&63);
+ }
+
+ // Set free page counts
+ for( base = 1; base < giMaxPhysPage; base ++ )
+ {
+ int rangeID;
+ // Skip allocated
+ if( gaMainBitmap[ base >> 6 ] & (1LL << (base&63)) ) continue;
+
+ // Get range ID
+ rangeID = MM_int_GetRangeID( base << 12 );
+
+ // Increment free page count
+ giPhysRangeFree[ rangeID ] ++;
+
+ // Check for first free page in range
+ if(giPhysRangeFirst[ rangeID ] == 0)
+ giPhysRangeFirst[ rangeID ] = base;
+ // Set last (when the last free page is reached, this won't be
+ // 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 ) // Speedup for the common case
- rangeID = MM_PHYS_MAX;
- else if( Bits > 32 )
+ if( MaxBits <= 0 || MaxBits >= 64 ) // Speedup for the common case
rangeID = MM_PHYS_MAX;
- else if( Bits > 24 )
- rangeID = MM_PHYS_32BIT;
- else if( Bits > 20 )
- rangeID = MM_PHYS_24BIT;
- else if( Bits > 16 )
- rangeID = MM_PHYS_20BIT;
else
- rangeID = MM_PHYS_16BIT;
+ 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("{%i,0x%x -> 0x%x}",
+ giPhysRangeFree[rangeID],
+ giPhysRangeFirst[rangeID], giPhysRangeLast[rangeID]
+ );
// Do a cheap scan, scanning upwards from the first free page in
// the range
- nFree = 1;
+ nFree = 0;
addr = giPhysRangeFirst[ rangeID ];
- while( addr < giPhysRangeLast[ rangeID ] )
+ while( addr <= giPhysRangeLast[ rangeID ] )
{
+ //Log(" MM_AllocPhysRange: addr = 0x%x", addr);
// Check the super bitmap
- if( gaSuperBitmap[addr >> (6+6)] == -1 ) {
+ 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)) {
+ 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( gaiPageReferences[addr] ) {
+ if( gaMainBitmap[addr >> 6] & (1LL << (addr & 63)) ) {
+ LOG("nFree = %i = 0 (page) (0x%x)", nFree, addr);
nFree = 0;
addr ++;
continue;
}
nFree ++;
addr ++;
+ LOG("nFree(%i) == %i (0x%x)", nFree, Pages, addr);
if(nFree == Num)
break;
}
+ 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);
Log_Warning("Arch",
"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++ )
{
- gaiPageReferences[addr] = 1;
-
- if(addr >> 32) rangeID = MM_PHYS_MAX;
- else if(addr >> 24) rangeID = MM_PHYS_32BIT;
- else if(addr >> 20) rangeID = MM_PHYS_24BIT;
- else if(addr >> 16) rangeID = MM_PHYS_20BIT;
- else if(addr >> 0) rangeID = MM_PHYS_16BIT;
+ 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;
}
- // Fill super bitmap
- Num += addr & (64-1);
+ ret = addr; // Save the return address
+
+ // Update super bitmap
+ 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++ )
{
- int j, bFull = 1;
- for( j = 0; j < 64; j ++ ) {
- if( gaiPageReferences[addr+i*64+j] ) {
- bFull = 0;
- break;
- }
- }
- if( bFull )
- gaSuperBitmap[addr>>12] |= 1 << ((addr >> 6) & 64);
+ if( gaMainBitmap[ addr >> 6 ] + 1 == 0 )
+ gaSuperBitmap[addr>>12] |= 1LL << ((addr >> 6) & 63);
}
- RELEASE(&glPhysicalPages);
- return addr << 12;
+ Mutex_Release(&glPhysicalPages);
+ LEAVE('x', ret << 12);
+ return ret << 12;
}
/**
*/
tPAddr MM_AllocPhys(void)
{
+ int i;
+
+ // Hack to allow allocation during setup
+ for(i = 0; i < NUM_STATIC_ALLOC; i++) {
+ if( gaiStaticAllocPages[i] ) {
+ tPAddr ret = gaiStaticAllocPages[i];
+ gaiStaticAllocPages[i] = 0;
+ Log("MM_AllocPhys: Return %x, static alloc %i", ret, i);
+ return ret;
+ }
+ }
+
return MM_AllocPhysRange(1, -1);
}
*/
void MM_RefPhys(tPAddr PAddr)
{
- int bIsFull, j;
+ Uint64 page = PAddr >> 12;
+
if( PAddr >> 12 > giMaxPhysPage ) return ;
- gaiPageReferences[ PAddr >> 12 ] ++;
- bIsFull = 1;
- for( j = 0; j < 64; j++ ) {
- if( gaiPageReferences[ PAddr >> 12 ] == 0 ) {
- bIsFull = 0;
- break;
- }
+ if( gaMainBitmap[ page >> 6 ] & (1LL << (page&63)) )
+ {
+ // Reference again
+ gaMultiBitmap[ page >> 6 ] |= 1LL << (page&63);
+ gaiPageReferences[ page ] ++;
+ }
+ else
+ {
+ // Allocate
+ gaMainBitmap[page >> 6] |= 1LL << (page&63);
+ if( gaMainBitmap[page >> 6 ] + 1 == 0 )
+ gaSuperBitmap[page>> 12] |= 1LL << ((page >> 6) & 63);
}
- if( bIsFull )
- gaSuperBitmap[PAddr >> 24] |= 1 << ((PAddr >> 18) & 64);
}
/**
*/
void MM_DerefPhys(tPAddr PAddr)
{
+ Uint64 page = PAddr >> 12;
+
if( PAddr >> 12 > giMaxPhysPage ) return ;
- gaiPageReferences[ PAddr >> 12 ] --;
- if( gaiPageReferences[ PAddr >> 12 ] )
+
+ if( gaMultiBitmap[ page >> 6 ] & (1LL << (page&63)) ) {
+ gaiPageReferences[ page ] --;
+ if( gaiPageReferences[ page ] == 1 )
+ gaMultiBitmap[ page >> 6 ] &= ~(1LL << (page&63));
+ if( gaiPageReferences[ page ] == 0 )
+ gaMainBitmap[ page >> 6 ] &= ~(1LL << (page&63));
+ }
+ else
+ gaMainBitmap[ page >> 6 ] &= ~(1LL << (page&63));
+
+ // Update the free counts if the page was freed
+ if( !(gaMainBitmap[ page >> 6 ] & (1LL << (page&63))) )
{
- gaSuperBitmap[PAddr >> 24] &= ~(1 << ((PAddr >> 18) & 64));
+ int rangeID;
+ rangeID = MM_int_GetRangeID( PAddr );
+ giPhysRangeFree[ rangeID ] ++;
+ if( giPhysRangeFirst[rangeID] > page )
+ giPhysRangeFirst[rangeID] = page;
+ if( giPhysRangeLast[rangeID] < page )
+ giPhysRangeLast[rangeID] = page;
}
+
+ // 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));
+ }
+}
+
+/**
+ * \brief Takes a physical address and returns the ID of its range
+ * \param Addr Physical address of page
+ * \return Range ID from eMMPhys_Ranges
+ */
+int MM_int_GetRangeID( tPAddr Addr )
+{
+ if(Addr >> 32)
+ return MM_PHYS_MAX;
+ else if(Addr >> 24)
+ return MM_PHYS_32BIT;
+ else if(Addr >> 20)
+ return MM_PHYS_24BIT;
+ else if(Addr >> 16)
+ return MM_PHYS_20BIT;
+ else
+ return MM_PHYS_16BIT;
}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au