150 lines
4.2 KiB
C++
150 lines
4.2 KiB
C++
/*
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* \brief Utilities fo thread creation on seL4
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* \author Norman Feske
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* \date 2015-05-12
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*
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* This file is used by both the core-specific implementation of the Thread API
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* and the platform-thread implementation for managing threads outside of core.
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*/
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/*
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* Copyright (C) 2015-2017 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 Affero General Public License version 3.
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*/
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#ifndef _CORE__INCLUDE__THREAD_SEL4_H_
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#define _CORE__INCLUDE__THREAD_SEL4_H_
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/* base-internal includes */
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#include <base/internal/assert.h>
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/* core includes */
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#include <map_local.h>
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#include <kernel_object.h>
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#include <untyped_memory.h>
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namespace Genode {
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struct Thread_info
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{
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Cap_sel tcb_sel { 0 };
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Cap_sel ep_sel { 0 };
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Cap_sel lock_sel { 0 };
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addr_t ipc_buffer_phys = 0;
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inline void write_thread_info_to_ipc_buffer(Cap_sel pd_ep_sel);
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Thread_info() { }
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inline void init(addr_t const utcb_virt_addr);
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inline void destruct();
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};
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/**
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* Set register values for the instruction pointer and stack pointer and
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* start the seL4 thread
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*/
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static inline void start_sel4_thread(Cap_sel tcb_sel, addr_t ip, addr_t sp);
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};
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void Genode::Thread_info::init(addr_t const utcb_virt_addr)
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{
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Platform &platform = *platform_specific();
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Range_allocator &phys_alloc = *platform.ram_alloc();
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/* create IPC buffer of one page */
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ipc_buffer_phys = Untyped_memory::alloc_page(phys_alloc);
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Untyped_memory::convert_to_page_frames(ipc_buffer_phys, 1);
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/* allocate TCB within core's CNode */
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{
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addr_t const phys_addr = Untyped_memory::alloc_page(phys_alloc);
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seL4_Untyped const service = Untyped_memory::untyped_sel(phys_addr).value();
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tcb_sel = platform.core_sel_alloc().alloc();
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create<Tcb_kobj>(service, platform.core_cnode().sel(), tcb_sel);
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}
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/* allocate synchronous endpoint within core's CNode */
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{
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addr_t const phys_addr = Untyped_memory::alloc_page(phys_alloc);
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seL4_Untyped const service = Untyped_memory::untyped_sel(phys_addr).value();
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ep_sel = platform.core_sel_alloc().alloc();
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create<Endpoint_kobj>(service, platform.core_cnode().sel(), ep_sel);
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}
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/* allocate asynchronous object within core's CSpace */
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{
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addr_t const phys_addr = Untyped_memory::alloc_page(phys_alloc);
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seL4_Untyped const service = Untyped_memory::untyped_sel(phys_addr).value();
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lock_sel = platform.core_sel_alloc().alloc();
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create<Notification_kobj>(service, platform.core_cnode().sel(), lock_sel);
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}
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/* assign IPC buffer to thread */
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{
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/* determine page frame selector of the allocated IPC buffer */
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Cap_sel ipc_buffer_sel = Untyped_memory::frame_sel(ipc_buffer_phys);
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int const ret = seL4_TCB_SetIPCBuffer(tcb_sel.value(), utcb_virt_addr,
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ipc_buffer_sel.value());
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ASSERT(ret == 0);
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}
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/* set scheduling priority */
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enum { PRIORITY_MAX = 0xff };
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seL4_TCB_SetMCPriority(tcb_sel.value(), PRIORITY_MAX);
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seL4_TCB_SetPriority(tcb_sel.value(), PRIORITY_MAX);
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}
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void Genode::Thread_info::destruct()
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{
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if (lock_sel.value()) {
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seL4_CNode_Delete(seL4_CapInitThreadCNode, lock_sel.value(), 32);
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platform_specific()->core_sel_alloc().free(lock_sel);
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}
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if (ep_sel.value()) {
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seL4_CNode_Delete(seL4_CapInitThreadCNode, ep_sel.value(), 32);
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platform_specific()->core_sel_alloc().free(ep_sel);
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}
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if (tcb_sel.value()) {
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seL4_CNode_Delete(seL4_CapInitThreadCNode, tcb_sel.value(), 32);
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platform_specific()->core_sel_alloc().free(tcb_sel);
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}
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if (ipc_buffer_phys) {
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Platform &platform = *platform_specific();
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Range_allocator &phys_alloc = *platform.ram_alloc();
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Untyped_memory::convert_to_untyped_frames(ipc_buffer_phys, 4096);
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Untyped_memory::free_page(phys_alloc, ipc_buffer_phys);
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}
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}
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void Genode::start_sel4_thread(Cap_sel tcb_sel, addr_t ip, addr_t sp)
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{
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/* set register values for the instruction pointer and stack pointer */
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seL4_UserContext regs;
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Genode::memset(®s, 0, sizeof(regs));
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size_t const num_regs = sizeof(regs)/sizeof(seL4_Word);
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regs.eip = ip;
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regs.esp = sp;
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regs.fs = IPCBUF_GDT_SELECTOR;
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int const ret = seL4_TCB_WriteRegisters(tcb_sel.value(), false, 0, num_regs, ®s);
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ASSERT(ret == 0);
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seL4_TCB_Resume(tcb_sel.value());
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}
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#endif /* _CORE__INCLUDE__THREAD_SEL4_H_ */
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