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;
}
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;
}