status_t
LargeMemoryPhysicalPageMapper::GetSlot(bool canWait, PhysicalPageSlot*& slot)
{
MutexLocker locker(fLock);
PhysicalPageSlotPool* pool = fNonEmptyPools.Head();
if (pool == NULL) {
if (!canWait)
return B_WOULD_BLOCK;
// allocate new pool
locker.Unlock();
status_t error = fInitialPool->AllocatePool(pool);
if (error != B_OK)
return error;
locker.Lock();
fNonEmptyPools.Add(pool);
pool = fNonEmptyPools.Head();
}
slot = pool->GetSlot();
if (pool->IsEmpty()) {
fNonEmptyPools.Remove(pool);
fEmptyPools.Add(pool);
}
return B_OK;
}
status_t
X86PagingMethod32Bit::Init(kernel_args* args,
VMPhysicalPageMapper** _physicalPageMapper)
{
TRACE("X86PagingMethod32Bit::Init(): entry\n");
// page hole set up in stage2
fPageHole = (page_table_entry*)(addr_t)args->arch_args.page_hole;
// calculate where the pgdir would be
fPageHolePageDir = (page_directory_entry*)
(((addr_t)args->arch_args.page_hole)
+ (B_PAGE_SIZE * 1024 - B_PAGE_SIZE));
// clear out the bottom 2 GB, unmap everything
memset(fPageHolePageDir + FIRST_USER_PGDIR_ENT, 0,
sizeof(page_directory_entry) * NUM_USER_PGDIR_ENTS);
fKernelPhysicalPageDirectory = args->arch_args.phys_pgdir;
fKernelVirtualPageDirectory = (page_directory_entry*)(addr_t)
args->arch_args.vir_pgdir;
#ifdef TRACE_X86_PAGING_METHOD_32_BIT
TRACE("page hole: %p, page dir: %p\n", fPageHole, fPageHolePageDir);
TRACE("page dir: %p (physical: %#" B_PRIx32 ")\n",
fKernelVirtualPageDirectory, fKernelPhysicalPageDirectory);
#endif
X86PagingStructures32Bit::StaticInit();
// create the initial pool for the physical page mapper
PhysicalPageSlotPool* pool
= new(&PhysicalPageSlotPool::sInitialPhysicalPagePool)
PhysicalPageSlotPool;
status_t error = pool->InitInitial(args);
if (error != B_OK) {
panic("X86PagingMethod32Bit::Init(): Failed to create initial pool "
"for physical page mapper!");
return error;
}
// create physical page mapper
large_memory_physical_page_ops_init(args, pool, fPhysicalPageMapper,
fKernelPhysicalPageMapper);
// TODO: Select the best page mapper!
// enable global page feature if available
if (x86_check_feature(IA32_FEATURE_PGE, FEATURE_COMMON)) {
// this prevents kernel pages from being flushed from TLB on
// context-switch
x86_write_cr4(x86_read_cr4() | IA32_CR4_GLOBAL_PAGES);
}
TRACE("X86PagingMethod32Bit::Init(): done\n");
*_physicalPageMapper = fPhysicalPageMapper;
return B_OK;
}
void
LargeMemoryPhysicalPageMapper::PutSlot(PhysicalPageSlot* slot)
{
MutexLocker locker(fLock);
PhysicalPageSlotPool* pool = slot->pool;
if (pool->IsEmpty()) {
fEmptyPools.Remove(pool);
fNonEmptyPools.Add(pool);
}
pool->PutSlot(slot);
}
status_t
ARMPagingMethod32Bit::Init(kernel_args* args,
VMPhysicalPageMapper** _physicalPageMapper)
{
TRACE("vm_translation_map_init: entry\n");
fKernelPhysicalPageDirectory = args->arch_args.phys_pgdir;
fKernelVirtualPageDirectory = (page_directory_entry*)
args->arch_args.vir_pgdir;
TRACE("page dir: %p (physical: %#" B_PRIx32 ")\n",
fKernelVirtualPageDirectory, fKernelPhysicalPageDirectory);
ARMPagingStructures32Bit::StaticInit();
// create the initial pool for the physical page mapper
PhysicalPageSlotPool* pool
= new(&PhysicalPageSlotPool::sInitialPhysicalPagePool)
PhysicalPageSlotPool;
status_t error = pool->InitInitial(args);
if (error != B_OK) {
panic("ARMPagingMethod32Bit::Init(): Failed to create initial pool "
"for physical page mapper!");
return error;
}
// create physical page mapper
large_memory_physical_page_ops_init(args, pool, fPhysicalPageMapper,
fKernelPhysicalPageMapper);
// TODO: Select the best page mapper!
// enable global page feature if available
#if 0 //IRA: check for ARMv6!!
if (x86_check_feature(IA32_FEATURE_PGE, FEATURE_COMMON)) {
// this prevents kernel pages from being flushed from TLB on
// context-switch
x86_write_cr4(x86_read_cr4() | IA32_CR4_GLOBAL_PAGES);
}
#endif
TRACE("ARMPagingMethod32Bit::Init(): done\n");
*_physicalPageMapper = fPhysicalPageMapper;
return B_OK;
}
status_t
X86PagingMethod32Bit::PhysicalPageSlotPool::AllocatePool(
X86LargePhysicalPageMapper::PhysicalPageSlotPool*& _pool)
{
// create the pool structure
PhysicalPageSlotPool* pool = new(std::nothrow) PhysicalPageSlotPool;
if (pool == NULL)
return B_NO_MEMORY;
ObjectDeleter<PhysicalPageSlotPool> poolDeleter(pool);
// create an area that can contain the page table and the slot
// structures
size_t areaSize = B_PAGE_SIZE + sizeof(PhysicalPageSlot[1024]);
void* data;
virtual_address_restrictions virtualRestrictions = {};
virtualRestrictions.address_specification = B_ANY_KERNEL_ADDRESS;
physical_address_restrictions physicalRestrictions = {};
area_id dataArea = create_area_etc(B_SYSTEM_TEAM, "physical page pool",
PAGE_ALIGN(areaSize), B_FULL_LOCK,
B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA, CREATE_AREA_DONT_WAIT,
&virtualRestrictions, &physicalRestrictions, &data);
if (dataArea < 0)
return dataArea;
// create the null area for the virtual address space
void* virtualBase;
area_id virtualArea = vm_create_null_area(
VMAddressSpace::KernelID(), "physical page pool space",
&virtualBase, B_ANY_KERNEL_BLOCK_ADDRESS, 1024 * B_PAGE_SIZE,
CREATE_AREA_PRIORITY_VIP);
if (virtualArea < 0) {
delete_area(dataArea);
return virtualArea;
}
// prepare the page table
memset(data, 0, B_PAGE_SIZE);
// get the page table's physical address
phys_addr_t physicalTable;
X86VMTranslationMap32Bit* map = static_cast<X86VMTranslationMap32Bit*>(
VMAddressSpace::Kernel()->TranslationMap());
uint32 dummyFlags;
cpu_status state = disable_interrupts();
map->QueryInterrupt((addr_t)data, &physicalTable, &dummyFlags);
restore_interrupts(state);
// put the page table into the page directory
int32 index = (addr_t)virtualBase / (B_PAGE_SIZE * 1024);
page_directory_entry* entry
= &map->PagingStructures32Bit()->pgdir_virt[index];
PutPageTableInPageDir(entry, physicalTable,
B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA);
X86PagingStructures32Bit::UpdateAllPageDirs(index, *entry);
// init the pool structure
pool->Init(dataArea, data, virtualArea, (addr_t)virtualBase);
poolDeleter.Detach();
_pool = pool;
return B_OK;
}
