113 lines
3.0 KiB
C++
113 lines
3.0 KiB
C++
/*
|
|
* \brief Utilities fo thread creation on seL4
|
|
* \author Norman Feske
|
|
* \date 2015-05-12
|
|
*
|
|
* This file is used by both the core-specific implementation of the Thread API
|
|
* and the platform-thread implementation for managing threads outside of core.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2015 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _CORE__INCLUDE__THREAD_SEL4_H_
|
|
#define _CORE__INCLUDE__THREAD_SEL4_H_
|
|
|
|
/* Genode includes */
|
|
#include <base/printf.h>
|
|
|
|
/* base-internal includes */
|
|
#include <internal/assert.h>
|
|
|
|
/* core includes */
|
|
#include <map_local.h>
|
|
#include <kernel_object.h>
|
|
|
|
namespace Genode {
|
|
|
|
struct Thread_info
|
|
{
|
|
unsigned tcb_sel = 0;
|
|
unsigned ep_sel = 0;
|
|
|
|
addr_t ipc_buffer_phys = 0;
|
|
|
|
inline void write_thread_info_to_ipc_buffer(unsigned pd_ep_sel);
|
|
|
|
Thread_info() { }
|
|
|
|
inline void init(addr_t const utcb_virt_addr);
|
|
};
|
|
|
|
/**
|
|
* Set register values for the instruction pointer and stack pointer and
|
|
* start the seL4 thread
|
|
*/
|
|
static inline void start_sel4_thread(unsigned tcb_sel, addr_t ip, addr_t sp);
|
|
};
|
|
|
|
|
|
void Genode::Thread_info::init(addr_t const utcb_virt_addr)
|
|
{
|
|
Platform &platform = *platform_specific();
|
|
Range_allocator &phys_alloc = *platform.ram_alloc();
|
|
|
|
/* create IPC buffer of one page */
|
|
size_t const ipc_buffer_size_log2 = get_page_size_log2();
|
|
Untyped_address ipc_buffer =
|
|
Untyped_memory::alloc_log2(phys_alloc, ipc_buffer_size_log2);
|
|
|
|
ipc_buffer_phys = ipc_buffer.phys();
|
|
|
|
Untyped_memory::convert_to_page_frames(ipc_buffer.phys(), 1);
|
|
|
|
/* allocate TCB within core's CNode */
|
|
tcb_sel = platform.alloc_core_sel();
|
|
Kernel_object::create<Kernel_object::Tcb>(phys_alloc,
|
|
platform.core_cnode().sel(),
|
|
tcb_sel);
|
|
|
|
/* allocate synchronous endpoint within core's CNode */
|
|
ep_sel = platform.alloc_core_sel();
|
|
Kernel_object::create<Kernel_object::Endpoint>(phys_alloc,
|
|
platform.core_cnode().sel(),
|
|
ep_sel);
|
|
/* assign IPC buffer to thread */
|
|
{
|
|
/* determine page frame selector of the allocated IPC buffer */
|
|
unsigned ipc_buffer_sel = Untyped_memory::frame_sel(ipc_buffer.phys());
|
|
|
|
int const ret = seL4_TCB_SetIPCBuffer(tcb_sel, utcb_virt_addr,
|
|
ipc_buffer_sel);
|
|
ASSERT(ret == 0);
|
|
}
|
|
|
|
/* set scheduling priority */
|
|
enum { PRIORITY_MAX = 0xff };
|
|
seL4_TCB_SetPriority(tcb_sel, PRIORITY_MAX);
|
|
}
|
|
|
|
|
|
void Genode::start_sel4_thread(unsigned tcb_sel, addr_t ip, addr_t sp)
|
|
{
|
|
/* set register values for the instruction pointer and stack pointer */
|
|
seL4_UserContext regs;
|
|
Genode::memset(®s, 0, sizeof(regs));
|
|
size_t const num_regs = sizeof(regs)/sizeof(seL4_Word);
|
|
|
|
regs.eip = ip;
|
|
regs.esp = sp;
|
|
regs.gs = IPCBUF_GDT_SELECTOR;
|
|
|
|
int const ret = seL4_TCB_WriteRegisters(tcb_sel, false, 0, num_regs, ®s);
|
|
ASSERT(ret == 0);
|
|
|
|
seL4_TCB_Resume(tcb_sel);
|
|
}
|
|
|
|
#endif /* _CORE__INCLUDE__THREAD_SEL4_H_ */
|