475 lines
15 KiB
C++
475 lines
15 KiB
C++
/*
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* \brief Platform interface implementation
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* \author Norman Feske
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* \date 2015-05-01
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*/
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/*
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* Copyright (C) 2015 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/sleep.h>
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#include <base/thread.h>
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#include <base/log.h>
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/* core includes */
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#include <boot_modules.h>
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#include <core_parent.h>
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#include <platform.h>
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#include <map_local.h>
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#include <cnode.h>
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#include <untyped_memory.h>
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/* base-internal includes */
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#include <base/internal/globals.h>
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#include <base/internal/stack_area.h>
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using namespace Genode;
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static bool const verbose_boot_info = true;
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/*
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* Memory-layout information provided by the linker script
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*/
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/* virtual address range consumed by core's program image */
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extern unsigned _prog_img_beg, _prog_img_end;
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/****************************************
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** Support for core memory management **
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****************************************/
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bool Mapped_mem_allocator::_map_local(addr_t virt_addr, addr_t phys_addr,
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unsigned size)
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{
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size_t const num_pages = size / get_page_size();
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Untyped_memory::convert_to_page_frames(phys_addr, num_pages);
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return map_local(phys_addr, virt_addr, num_pages);
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}
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bool Mapped_mem_allocator::_unmap_local(addr_t virt_addr, addr_t phys_addr,
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unsigned size)
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{
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if (!unmap_local(virt_addr, size / get_page_size()))
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return false;
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Untyped_memory::convert_to_untyped_frames(phys_addr, size);
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return true;
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}
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/************************
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** Platform interface **
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************************/
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void Platform::_init_unused_phys_alloc()
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{
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/* enable log support early */
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init_log();
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/* the lower physical ram is kept by the kernel and not usable to us */
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_unused_phys_alloc.add_range(0x100000, 0UL - 0x100000);
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}
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static inline void init_sel4_ipc_buffer()
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{
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asm volatile ("movl %0, %%gs" :: "r"(IPCBUF_GDT_SELECTOR) : "memory");
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}
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void Platform::_init_allocators()
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{
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/* interrupt allocator */
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_irq_alloc.add_range(0, 256);
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/*
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* XXX allocate intermediate CNodes for organizing the untyped pages here
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*/
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/* register remaining untyped memory to physical memory allocator */
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auto add_phys_range = [&] (Initial_untyped_pool::Range const &range) {
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addr_t const page_aligned_offset =
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align_addr(range.free_offset, get_page_size_log2());
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if (page_aligned_offset >= range.size)
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return;
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addr_t const base = range.phys + page_aligned_offset;
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size_t const size = range.size - page_aligned_offset;
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_core_mem_alloc.phys_alloc()->add_range(base, size);
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_unused_phys_alloc.remove_range(base, size);
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};
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_initial_untyped_pool.for_each_range(add_phys_range);
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/* turn remaining untyped memory ranges into untyped pages */
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_initial_untyped_pool.turn_remainder_into_untyped_pages();
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/*
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* From this point on, we can no longer create kernel objects from the
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* '_initial_untyped_pool' because the pool is empty.
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*/
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/* move device memory regions to phys cnode */
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seL4_BootInfo const &bi = sel4_boot_info();
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Cnode_base const initial_cspace(Cap_sel(seL4_CapInitThreadCNode), 32);
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for (unsigned region = 0; region < bi.numDeviceRegions; region++) {
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size_t const frame_size = 1UL << bi.deviceRegions[region].frameSizeBits;
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if (frame_size != 4096) {
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error("unsupported device memory frame size of ", Hex(frame_size));
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class Unsupported_dev_memory_framesize{};
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throw Unsupported_dev_memory_framesize();
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}
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for (uint64_t sel = bi.deviceRegions[region].frames.start,
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phys_addr = bi.deviceRegions[region].basePaddr;
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sel < bi.deviceRegions[region].frames.end;
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sel++, phys_addr += frame_size) {
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_io_mem_alloc.add_range(phys_addr, frame_size);
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_unused_phys_alloc.remove_range(phys_addr, frame_size);
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addr_t const dst_frame = phys_addr >> get_page_size_log2();
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_phys_cnode.move(initial_cspace, Cnode_index(sel),
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Cnode_index(dst_frame));
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}
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}
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/* core's virtual memory */
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_core_mem_alloc.virt_alloc()->add_range(_vm_base, _vm_size);
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/* remove core image from core's virtual address allocator */
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/*
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* XXX Why do we need to skip a page after the end of core?
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* When allocating a PTE immediately after _prog_img_end, the
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* kernel would complain "Mapping already present" on the
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* attempt to map a page frame.
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*/
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addr_t const core_virt_beg = trunc_page((addr_t)&_prog_img_beg),
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core_virt_end = round_page((addr_t)&_prog_img_end)
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+ 4096;
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size_t const core_size = core_virt_end - core_virt_beg;
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_core_mem_alloc.virt_alloc()->remove_range(core_virt_beg, core_size);
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if (verbose_boot_info) {
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log("core image:");
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log(" virtual address range ",
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Hex_range<addr_t>(core_virt_beg, core_virt_end - core_virt_beg), " "
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"size=", Hex(core_size));
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}
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/* preserve sel4 boot info page in core's virtual address space */
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addr_t const sel4_boot_info_page = reinterpret_cast<addr_t>(&bi);
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_core_mem_alloc.virt_alloc()->remove_range(sel4_boot_info_page, 0x1000);
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if (sel4_boot_info_page != core_virt_end)
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warning("unexpected core binary layout");
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/* preserve stack area in core's virtual address space */
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_core_mem_alloc.virt_alloc()->remove_range(stack_area_virtual_base(),
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stack_area_virtual_size());
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}
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void Platform::_switch_to_core_cspace()
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{
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Cnode_base const initial_cspace(Cap_sel(seL4_CapInitThreadCNode), 32);
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/* copy initial selectors to core's CNode */
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapInitThreadTCB));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapInitThreadVSpace));
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_core_cnode.move(initial_cspace, Cnode_index(seL4_CapIRQControl)); /* cannot be copied */
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapASIDControl));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapInitThreadASIDPool));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapIOPort));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapBootInfoFrame));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapInitThreadIPCBuffer));
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_core_cnode.copy(initial_cspace, Cnode_index(seL4_CapDomain));
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/* replace seL4_CapInitThreadCNode with new top-level CNode */
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_core_cnode.copy(initial_cspace, Cnode_index(Core_cspace::top_cnode_sel()),
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Cnode_index(seL4_CapInitThreadCNode));
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/* copy untyped memory selectors to core's CNode */
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seL4_BootInfo const &bi = sel4_boot_info();
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/*
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* We have to move (not copy) the selectors for the initial untyped ranges
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* because some of them are already populated with kernel objects allocated
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* via '_initial_untyped_pool'. For such an untyped memory range, the
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* attempt to copy its selector would result in the following error:
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*
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* <<seL4: Error deriving cap for CNode Copy operation.>>
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*/
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for (unsigned sel = bi.untyped.start; sel < bi.untyped.end; sel++)
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_core_cnode.move(initial_cspace, Cnode_index(sel));
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/* move the device memory selectors to core's CNode */
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for (unsigned region = 0; region < bi.numDeviceRegions; region++) {
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for (unsigned sel = bi.deviceRegions[region].frames.start;
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sel < bi.deviceRegions[region].frames.end; sel++)
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_core_cnode.move(initial_cspace, Cnode_index(sel));
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}
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for (unsigned sel = bi.userImageFrames.start; sel < bi.userImageFrames.end; sel++)
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_core_cnode.copy(initial_cspace, Cnode_index(sel));
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/* copy statically created CNode selectors to core's CNode */
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_core_cnode.copy(initial_cspace, Cnode_index(Core_cspace::top_cnode_sel()));
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_core_cnode.copy(initial_cspace, Cnode_index(Core_cspace::core_pad_cnode_sel()));
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_core_cnode.copy(initial_cspace, Cnode_index(Core_cspace::core_cnode_sel()));
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_core_cnode.copy(initial_cspace, Cnode_index(Core_cspace::phys_cnode_sel()));
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/*
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* Construct CNode hierarchy of core's CSpace
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*/
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/* insert 3rd-level core CNode into 2nd-level core-pad CNode */
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_core_pad_cnode.copy(initial_cspace, Cnode_index(Core_cspace::core_cnode_sel()),
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Cnode_index(0));
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/* insert 2nd-level core-pad CNode into 1st-level CNode */
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_top_cnode.copy(initial_cspace, Cnode_index(Core_cspace::core_pad_cnode_sel()),
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Cnode_index(Core_cspace::TOP_CNODE_CORE_IDX));
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/* insert 2nd-level phys-mem CNode into 1st-level CNode */
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_top_cnode.copy(initial_cspace, Cnode_index(Core_cspace::phys_cnode_sel()),
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Cnode_index(Core_cspace::TOP_CNODE_PHYS_IDX));
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/* insert 2nd-level untyped-pages CNode into 1st-level CNode */
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_top_cnode.copy(initial_cspace, Cnode_index(Core_cspace::untyped_cnode_sel()),
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Cnode_index(Core_cspace::TOP_CNODE_UNTYPED_IDX));
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/* activate core's CSpace */
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{
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seL4_CapData_t null_data = { { 0 } };
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int const ret = seL4_TCB_SetSpace(seL4_CapInitThreadTCB,
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seL4_CapNull, /* fault_ep */
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Core_cspace::top_cnode_sel(), null_data,
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seL4_CapInitThreadPD, null_data);
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if (ret != seL4_NoError)
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error(__FUNCTION__, ": seL4_TCB_SetSpace returned ", ret);
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}
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}
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Cap_sel Platform::_init_asid_pool()
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{
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return Cap_sel(seL4_CapInitThreadASIDPool);
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}
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void Platform::_init_core_page_table_registry()
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{
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seL4_BootInfo const &bi = sel4_boot_info();
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addr_t const modules_start = reinterpret_cast<addr_t>(&_boot_modules_binaries_begin);
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addr_t const modules_end = reinterpret_cast<addr_t>(&_boot_modules_binaries_end);
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/*
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* Register initial page tables
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*/
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addr_t virt_addr = (addr_t)(&_prog_img_beg);
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for (unsigned sel = bi.userImagePaging.start; sel < bi.userImagePaging.end; sel++) {
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_core_page_table_registry.insert_page_table(virt_addr, Cap_sel(sel));
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/* one page table has 1024 entries */
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virt_addr += 1024*get_page_size();
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}
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/*
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* Register initial page frames
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*/
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virt_addr = (addr_t)(&_prog_img_beg);
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for (unsigned sel = bi.userImageFrames.start; sel < bi.userImageFrames.end; sel++) {
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/* skip boot modules */
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if (modules_start <= virt_addr && virt_addr <= modules_end)
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continue;
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_core_page_table_registry.insert_page_table_entry(virt_addr, sel);
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virt_addr += get_page_size();
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}
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}
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void Platform::_init_rom_modules()
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{
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seL4_BootInfo const &bi = sel4_boot_info();
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/*
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* Slab allocator for allocating 'Rom_module' meta data.
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*/
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static long slab_block[4096];
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static Tslab<Rom_module, sizeof(slab_block)>
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rom_module_slab(core_mem_alloc(), (Genode::Slab_block *)slab_block);
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/*
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* Allocate unused range of phys CNode address space where to make the
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* boot modules available.
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*/
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void *out_ptr = nullptr;
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size_t const modules_size = (addr_t)&_boot_modules_binaries_end
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- (addr_t)&_boot_modules_binaries_begin + 1;
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Range_allocator::Alloc_return const alloc_ret =
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_unused_phys_alloc.alloc_aligned(modules_size, &out_ptr, get_page_size_log2());
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if (alloc_ret.error()) {
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error("could not reserve phys CNode space for boot modules");
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struct Init_rom_modules_failed { };
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throw Init_rom_modules_failed();
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}
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/*
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* Calculate frame frame selector used to back the boot modules
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*/
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addr_t const unused_range_start = (addr_t)out_ptr;
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addr_t const unused_first_frame_sel = unused_range_start >> get_page_size_log2();
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addr_t const modules_start = (addr_t)&_boot_modules_binaries_begin;
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addr_t const modules_core_offset = modules_start
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- (addr_t)&_prog_img_beg;
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addr_t const modules_first_frame_sel = bi.userImageFrames.start
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+ (modules_core_offset >> get_page_size_log2());
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Boot_modules_header const *header = &_boot_modules_headers_begin;
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for (; header < &_boot_modules_headers_end; header++) {
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/* offset relative to first module */
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addr_t const module_offset = header->base - modules_start;
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addr_t const module_offset_frames = module_offset >> get_page_size_log2();
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size_t const module_size = round_page(header->size);
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addr_t const module_frame_sel = modules_first_frame_sel
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+ module_offset_frames;
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size_t const module_num_frames = module_size >> get_page_size_log2();
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/*
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* Destination frame within phys CNode
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*/
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addr_t const dst_frame = unused_first_frame_sel + module_offset_frames;
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/*
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* Install the module's frame selectors into phys CNode
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*/
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Cnode_base const initial_cspace(Cap_sel(seL4_CapInitThreadCNode), 32);
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for (unsigned i = 0; i < module_num_frames; i++)
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_phys_cnode.copy(initial_cspace, Cnode_index(module_frame_sel + i),
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Cnode_index(dst_frame + i));
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log("boot module '", header->name, "' (", header->size, " bytes)");
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/*
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* Register ROM module, the base address refers to location of the
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* ROM module within the phys CNode address space.
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*/
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Rom_module * rom_module = new (rom_module_slab)
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Rom_module(dst_frame << get_page_size_log2(), header->size,
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(const char*)header->name);
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_rom_fs.insert(rom_module);
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}
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}
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Platform::Platform()
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:
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_io_mem_alloc(core_mem_alloc()), _io_port_alloc(core_mem_alloc()),
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_irq_alloc(core_mem_alloc()),
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_unused_phys_alloc(core_mem_alloc()),
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_init_unused_phys_alloc_done((_init_unused_phys_alloc(), true)),
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_vm_base(0x2000), /* 2nd page is used as IPC buffer of main thread */
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_vm_size(3*1024*1024*1024UL - _vm_base), /* use the lower 3GiB */
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_init_sel4_ipc_buffer_done((init_sel4_ipc_buffer(), true)),
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_switch_to_core_cspace_done((_switch_to_core_cspace(), true)),
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_core_page_table_registry(*core_mem_alloc()),
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_init_core_page_table_registry_done((_init_core_page_table_registry(), true)),
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_init_allocators_done((_init_allocators(), true)),
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_core_vm_space(Cap_sel(seL4_CapInitThreadPD),
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_core_sel_alloc,
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_phys_alloc,
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_top_cnode,
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_core_cnode,
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_phys_cnode,
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Core_cspace::CORE_VM_ID,
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_core_page_table_registry,
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"core")
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{
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/* create notification object for Genode::Lock used by this first thread */
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Cap_sel lock_sel (INITIAL_SEL_LOCK);
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Cap_sel core_sel = _core_sel_alloc.alloc();
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create<Notification_kobj>(*ram_alloc(), core_cnode().sel(), core_sel);
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/* mint a copy of the notification object with badge of lock_sel */
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_core_cnode.mint(_core_cnode, core_sel, lock_sel);
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/* test signal/wakeup once */
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seL4_Word sender;
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seL4_Signal(lock_sel.value());
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seL4_Wait(lock_sel.value(), &sender);
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ASSERT(sender == INITIAL_SEL_LOCK);
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/* I/O port allocator (only meaningful for x86) */
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_io_port_alloc.add_range(0, 0x10000);
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/*
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* Log statistics about allocator initialization
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*/
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log("VM area at ", Hex_range<addr_t>(_vm_base, _vm_size));
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if (verbose_boot_info) {
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log(":phys_alloc: "); (*_core_mem_alloc.phys_alloc())()->dump_addr_tree();
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log(":unused_phys_alloc:"); _unused_phys_alloc()->dump_addr_tree();
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log(":virt_alloc: "); (*_core_mem_alloc.virt_alloc())()->dump_addr_tree();
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log(":io_mem_alloc: "); _io_mem_alloc()->dump_addr_tree();
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}
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_init_rom_modules();
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}
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unsigned Platform::alloc_core_rcv_sel()
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{
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Cap_sel rcv_sel = _core_sel_alloc.alloc();
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seL4_SetCapReceivePath(_core_cnode.sel().value(), rcv_sel.value(),
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_core_cnode.size_log2());
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return rcv_sel.value();
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}
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void Platform::reset_sel(unsigned sel)
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{
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_core_cnode.remove(Cap_sel(sel));
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}
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void Platform::wait_for_exit()
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{
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sleep_forever();
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}
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void Core_parent::exit(int exit_value) { }
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