paging/040/M68KPagingMethod040.cpp

40 /* Slots per pool for the physical page mapper.
41  * Since m68k page tables are smaller than 1 page, but we allocate them
42  * at page granularity anyway, just go for this.
66 	// update page directory entry atomically
81 	// update page directory entry atomically
96 	// update page table entry atomically
113 	// update page table entry atomically
168 			"physical page pool space in virtual address space!");
172 	// allocate memory for the page table and data
177 	// prepare the page table
196 	area_id area = create_area("physical page pool", &temp,
201 			"create area for physical page pool.");
209 		"physical page pool space", &temp, B_EXACT_ADDRESS,
213 			"create area for physical page pool space.");
269 	// create an area that can contain the page table and the slot
276 	area_id dataArea = create_area_etc(B_SYSTEM_TEAM, "physical page pool",
286 		VMAddressSpace::KernelID(), "physical page pool space",
294 	// prepare the page table
297 	// get the page table's physical address
306 #warning M68K:FIXME: insert *all* page tables!
309 	// put the page table into the page directory
353 	// page hole set up in stage2
368 	//TRACE("page hole: %p, page dir: %p\n", fPageHole, fPageHolePageDir);
369 	TRACE("page root: %p (physical: %#" B_PRIx32 ")\n",
377 	// create the initial pool for the physical page mapper
384 			"for physical page mapper!");
388 	// create physical page mapper
391 		// TODO: Select the best page mapper!
405 	// the page hole
411 	// unmap the page hole hack we were using before
430 	//	page table, which is not yet enforced (or even tested)!
439 	// insert the indirect descriptor in the tree so we can map the page we want from it.
473 	// XXX horrible back door to map a page quickly regardless of translation
475 	// uses a 'page hole' set up in the stage 2 bootloader. The page hole is
496 		TRACE("missing page root entry %d ai %d\n", index, aindex);
500 		TRACE("040::MapEarly: asked for free page for pgdir. 0x%lx\n", tbl);
503 		// for each pgdir on the allocated page:
520 		TRACE("missing page dir entry %d ai %d\n", index, aindex);
524 		TRACE("early_map: asked for free page for pgtable. 0x%lx\n", tbl);
527 		// for each pgdir on the allocated page:
552 	// check to see if a page table exists for this range
562 		TRACE("M68KPagingMethod040::MapEarly(): asked for free page for "
615 		| DT_DIR;	// it's a page directory entry
617 	// ToDo: we ignore the attributes of the page table - for compatibility
634 		| DT_DIR;	// it's a page directory entry
644 	page_table_entry page = TA_TO_PTEA(physicalAddress)
651 	// if the page is user accessible, it's automatically
655 		page |= M68K_PTE_SUPERVISOR;
657 			page |= M68K_PTE_READONLY;
659 		page |= M68K_PTE_READONLY;
662 	// put it in the page table
663 	*(volatile page_table_entry*)entry = page;
676 	// note the bootloader allocates all page directories for us
689 			// early_query handles non-page-aligned addresses
750 				// we should only be passed page va, but just in case.
769 		// page mapping not valid