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genode/base-hw/include/kernel/syscalls.h
Martin Stein ff65f6f021 Run Genode directly on hardware with 'base-hw'.
2012-08-03 12:06:37 +02:00

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/*
* \brief Kernels syscall frontend
* \author Martin stein
* \date 2011-11-30
*/
/*
* Copyright (C) 2011-2012 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 _INCLUDE__KERNEL__SYSCALLS_H_
#define _INCLUDE__KERNEL__SYSCALLS_H_
/* Genode includes */
#include <base/syscall.h>
class Software_tlb;
namespace Genode
{
class Platform_thread;
}
namespace Kernel
{
/**
* Unique opcodes of all syscalls supported by the kernel
*/
enum Syscall_type
{
INVALID_SYSCALL = 0,
/* execution control */
NEW_THREAD = 1,
START_THREAD = 2,
PAUSE_THREAD = 3,
RESUME_THREAD = 4,
GET_THREAD = 5,
CURRENT_THREAD_ID = 6,
YIELD_THREAD = 7,
READ_REGISTER = 18,
WRITE_REGISTER = 19,
/* interprocess communication */
REQUEST_AND_WAIT = 8,
REPLY_AND_WAIT = 9,
WAIT_FOR_REQUEST = 10,
/* management of resource protection-domains */
SET_PAGER = 11,
UPDATE_PD = 12,
NEW_PD = 13,
/* interrupt handling */
ALLOCATE_IRQ = 14,
AWAIT_IRQ = 15,
FREE_IRQ = 16,
/* debugging */
PRINT_CHAR = 17,
/* asynchronous signalling */
NEW_SIGNAL_RECEIVER = 20,
NEW_SIGNAL_CONTEXT = 21,
AWAIT_SIGNAL = 22,
SUBMIT_SIGNAL = 23,
};
/**
* Virtual range of the mode transition region in every PD
*/
Genode::addr_t mode_transition_virt_base();
Genode::size_t mode_transition_size();
/**
* Get sizes of the kernel objects
*/
Genode::size_t thread_size();
Genode::size_t pd_size();
Genode::size_t signal_context_size();
Genode::size_t signal_receiver_size();
/**
* Get alignment constraints of the kernel objects
*/
unsigned kernel_pd_alignm_log2();
/**
* Create a new PD
*
* \param dst physical base of an appropriate portion of memory
* that is thereupon allocated to the kernel
*
* \retval >0 ID of the new PD
* \retval 0 if no new PD was created
*
* Restricted to core threads. Regaining of the supplied memory is not
* supported by now.
*/
inline int new_pd(void * const dst)
{ return syscall(NEW_PD, (Syscall_arg)dst); }
/**
* Propagate changes in PD configuration
*
* \param pd_id ID of the PD that has been configured
*
* It might be, that the kernel and/or the hardware caches parts of PD
* configurations such as virtual address translations. This syscall
* ensures that the current configuration of the targeted PD gets fully
* applied from the moment it returns to the userland. This syscall is
* inappropriate in case that a PD wants to change its own configuration.
* There's no need for this syscall after a configuration change that
* can't affect the kernel and/or hardware caches.
*
* Restricted to core threads.
*/
inline void update_pd(unsigned long const pd_id)
{ syscall(UPDATE_PD, (Syscall_arg)pd_id); }
/**
* Create a new thread that is stopped initially
*
* \param dst physical base of an appropriate portion of memory
* that is thereupon allocated to the kernel
* \param pt assigned platform thread
*
* \retval >0 ID of the new thread
* \retval 0 if no new thread was created
*
* Restricted to core threads. Regaining of the supplied memory is not
* supported by now.
*/
inline int new_thread(void * const dst, Genode::Platform_thread * const pt)
{ return syscall(NEW_THREAD, (Syscall_arg)dst, (Syscall_arg)pt); }
/**
* Start thread with a given context and let it participate in CPU scheduling
*
* \param id ID of targeted thread
* \param ip initial instruction pointer
* \param sp initial stack pointer
*
* \retval >0 success, return value is the software TLB of the thread
* \retval 0 the targeted thread wasn't started or was already started
* when this gets called (in both cases it remains untouched)
*
* Restricted to core threads.
*/
inline Software_tlb *
start_thread(Genode::Platform_thread * const phys_pt, void * ip, void * sp,
unsigned int cpu_no)
{
return (Software_tlb *)syscall(START_THREAD,
(Syscall_arg)phys_pt,
(Syscall_arg)ip,
(Syscall_arg)sp,
(Syscall_arg)cpu_no);
}
/**
* Prevent thread from participating in CPU scheduling
*
* \param id ID of the targeted thread. If not set
* this will target the current thread.
*
* \retval 0 syscall was successful
* \retval <0 if the targeted thread does not exist or still participates
* in CPU scheduling after
*
* If the caller doesn't target itself, this is restricted to core threads.
*/
inline int pause_thread(unsigned long const id = 0)
{ return syscall(PAUSE_THREAD, id); }
/**
* Let an already started thread participate in CPU scheduling
*
* \param id ID of the targeted thread
*
* \retval 0 if syscall was successful and thread were paused beforehand
* \retval >0 if syscall was successful and thread were already active
* \retval <0 if targeted thread doesn't participate in CPU
* scheduling after
*/
inline int resume_thread(unsigned long const id = 0)
{ return syscall(RESUME_THREAD, id); }
/**
* Let the current thread give up its remaining timeslice
*
* \param id if this thread ID is set and valid this will resume the
* targeted thread additionally
*/
inline void yield_thread(unsigned long const id = 0)
{ syscall(YIELD_THREAD, id); }
/**
* Get the thread ID of the current thread
*/
inline int current_thread_id() { return syscall(CURRENT_THREAD_ID); }
/**
* Get platform thread by ID or 0 if target is "core main" or "idle"
*
* \param id ID of the targeted thread or 0 if caller targets itself
*
* Restricted to core threads.
*/
inline Genode::Platform_thread * get_thread(unsigned long const id = 0)
{ return (Genode::Platform_thread *)syscall(GET_THREAD, id); }
/**
* Send IPC request and wait for reply
*
* \param id ID of the receiver thread
* \param size request size (beginning with the callers UTCB base)
*
* \return size of received reply (beginning with the callers UTCB base)
*
* If the receiver exists, this blocks execution until a dedicated reply
* message has been send by the receiver. The receiver may never do so.
*/
inline unsigned long request_and_wait(unsigned long const id,
unsigned long const size)
{ return (unsigned long)syscall(REQUEST_AND_WAIT, id, size); }
/**
* Wait for next IPC request, discard current request
*
* \return size of received request (beginning with the callers UTCB base)
*/
inline unsigned long wait_for_request()
{ return (unsigned long)syscall(WAIT_FOR_REQUEST); }
/**
* Send reply of the last received request and wait for next request
*
* \param size reply-message size (beginning with the callers UTCB base)
*
* \return size of received request (beginning with the callers UTCB base)
*/
inline unsigned long reply_and_wait(unsigned long const size)
{ return (unsigned long)syscall(REPLY_AND_WAIT, size); }
/**
* Set a thread that gets informed about pagefaults of another thread
*
* \param pager_id ID of the thread that shall get informed.
* Subsequently this thread gets an IPC message,
* wich contains an according 'Pagefault' object for
* every pagefault the faulter throws.
* \param faulter_id ID of the thread that throws the pagefaults
* wich shall be notified. After every pagefault this
* thread remains paused to be reactivated by
* 'resume_thread'.
*
* Restricted to core threads.
*/
inline void set_pager(unsigned long const pager_id,
unsigned long const faulter_id)
{ syscall(SET_PAGER, pager_id, faulter_id); }
/**
* Print a char 'c' to the kernels serial ouput
*/
inline void print_char(char const c)
{ syscall(PRINT_CHAR, (Syscall_arg)c); }
/**
* Allocate an IRQ to the caller if the IRQ is not allocated already
*
* \param id ID of the targeted IRQ
*
* \return wether the IRQ has been allocated to this thread or not
*
* Restricted to core threads.
*/
inline bool allocate_irq(unsigned long const id)
{ return syscall(ALLOCATE_IRQ, (Syscall_arg)id); }
/**
* Free an IRQ from allocation if it is allocated by the caller
*
* \param id ID of the targeted IRQ
*
* \return wether the IRQ has been freed or not
*
* Restricted to core threads.
*/
inline bool free_irq(unsigned long const id)
{ return syscall(FREE_IRQ, (Syscall_arg)id); }
/**
* Block caller for the occurence of its IRQ
*
* Restricted to core threads. Blocks the caller forever
* if he has not allocated any IRQ.
*/
inline void await_irq() { syscall(AWAIT_IRQ); }
/**
* Get the current value of a register of a specific CPU context
*
* \param thread_id ID of the thread that owns the targeted context
* \param reg_id platform-specific ID of the targeted register
*
* Restricted to core threads. One can also read from its own context,
* or any thread that is active in the meantime. In these cases
* be aware of the fact, that the result reflects the context
* state that were backed at the last kernel entry of the thread.
*/
inline unsigned long read_register(unsigned long const thread_id,
unsigned long const reg_id)
{
return syscall(READ_REGISTER, (Syscall_arg)thread_id,
(Syscall_arg)reg_id);
}
/**
* Write a value to a register of a specific CPU context
*
* \param thread_id ID of the thread that owns the targeted context
* \param reg_id platform-specific ID of the targeted register
* \param value value that shall be written to the register
*
* Restricted to core threads. One can also write to its own context, or
* to that of a thread that is active in the meantime.
*/
inline void write_register(unsigned long const thread_id,
unsigned long const reg_id,
unsigned long const value)
{
syscall(WRITE_REGISTER, (Syscall_arg)thread_id, (Syscall_arg)reg_id,
(Syscall_arg)value);
}
/**
* Create a kernel object that acts as receiver for asynchronous signals
*
* \param dst physical base of an appropriate portion of memory
* that is thereupon allocated to the kernel
*
* \return ID of the new kernel object
*
* Restricted to core threads. Regaining of the supplied memory is not
* supported by now.
*/
inline unsigned long new_signal_receiver(void * dst)
{ return syscall(NEW_SIGNAL_RECEIVER, (Syscall_arg)dst); }
/**
* Create a kernel object that acts as a distinct signal type at a receiver
*
* \param dst physical base of an appropriate portion of memory
* that is thereupon allocated to the kernel
* \param receiver_id ID of the receiver kernel-object that shall
* provide the new signal context
* \param imprint Every signal, one receives at the new context,
* will hold this imprint. This enables the receiver
* to interrelate signals with the context.
*
* \return ID of the new kernel object
*
* Core-only syscall. Regaining of the supplied memory is not
* supported by now.
*/
inline unsigned long new_signal_context(void * dst,
unsigned long receiver_id,
unsigned long imprint)
{
return syscall(NEW_SIGNAL_CONTEXT, (Syscall_arg)dst,
(Syscall_arg)receiver_id, (Syscall_arg)imprint);
}
/**
* Wait for occurence of at least one signal at any context of a receiver
*
* \param receiver_id ID of the targeted receiver kernel-object
*
* When this call returns, an instance of 'Signal' is located at the base
* of the callers UTCB. It holds information about wich context was
* triggered how often. It is granted that every occurence of a signal is
* provided through this function, exactly till it gets delivered through
* this function. If multiple threads listen at the same receiver and/or
* multiple contexts trigger simultanously there is no assertion about
* wich thread receives the 'Signal' instance of wich context.
*/
inline void await_signal(unsigned long receiver_id)
{ syscall(AWAIT_SIGNAL, (Syscall_arg)receiver_id); }
/**
* Trigger a specific signal context
*
* \param context_id ID of the targeted context kernel-object
* \param num how often the context shall be triggered by this call
*/
inline void submit_signal(unsigned long context_id, int num)
{ syscall(SUBMIT_SIGNAL, (Syscall_arg)context_id, (Syscall_arg)num); }
}
#endif /* _INCLUDE__KERNEL__SYSCALLS_H_ */
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