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minix/kernel/system/do_setalarm.c

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Al's system call -> kernel call renaming
2005-10-14 10:58:59 +02:00
/* The kernel call implemented in this file:
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
* m_type: SYS_SETALARM
*
Al's system call -> kernel call renaming
2005-10-14 10:58:59 +02:00
* The parameters for this kernel call are:
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
* m2_l1: ALRM_EXP_TIME (alarm's expiration time)
* m2_i2: ALRM_ABS_TIME (expiration time is absolute?)
System processes can be signaled; signals are transformed in SYS_EVENT message that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
2005-07-19 14:21:36 +02:00
* m2_l1: ALRM_TIME_LEFT (return seconds left of previous)
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
*/
Convert kernel over to bsdmake
2010-04-02 00:22:33 +02:00
#include "kernel/system.h"
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
'proc number' is process slot, 'endpoint' are generation-aware process instance numbers, encoded and decoded using macros in <minix/endpoint.h>. proc number -> endpoint migration . proc_nr in the interrupt hook is now an endpoint, proc_nr_e. . m_source for messages and notifies is now an endpoint, instead of proc number. . isokendpt() converts an endpoint to a process number, returns success (but fails if the process number is out of range, the process slot is not a living process, or the given endpoint number does not match the endpoint number in the process slot, indicating an old process). . okendpt() is the same as isokendpt(), but panic()s if the conversion fails. This is mainly used for decoding message.m_source endpoints, and other endpoint numbers in kernel data structures, which should always be correct. . if DEBUG_ENABLE_IPC_WARNINGS is enabled, isokendpt() and okendpt() get passed the __FILE__ and __LINE__ of the calling lines, and print messages about what is wrong with the endpoint number (out of range proc, empty proc, or inconsistent endpoint number), with the caller, making finding where the conversion failed easy without having to include code for every call to print where things went wrong. Sometimes this is harmless (wrong arg to a kernel call), sometimes it's a fatal internal inconsistency (bogus m_source). . some process table fields have been appended an _e to indicate it's become and endpoint. . process endpoint is stored in p_endpoint, without generation number. it turns out the kernel never needs the generation number, except when fork()ing, so it's decoded then. . kernel calls all take endpoints as arguments, not proc numbers. the one exception is sys_fork(), which needs to know in which slot to put the child.
2006-03-03 11:00:02 +01:00
#include <minix/endpoint.h>
scheduling - time quantum in miliseconds - Currently the cpu time quantum is timer-ticks based. Thus the remaining quantum is decreased only if the processes is interrupted by a timer tick. As processes block a lot this typically does not happen for normal user processes. Also the quantum depends on the frequency of the timer. - This change makes the quantum miliseconds based. Internally the miliseconds are translated into cpu cycles. Everytime userspace execution is interrupted by kernel the cycles just consumed by the current process are deducted from the remaining quantum. - It makes the quantum system timer frequency independent. - The boot processes quantum is loosely derived from the tick-based quantas and 60Hz timer and subject to future change - the 64bit arithmetics is a little ugly, will be changes once we have compiler support for 64bit integers (soon)
2010-05-25 10:06:14 +02:00
#include <assert.h>
'proc number' is process slot, 'endpoint' are generation-aware process instance numbers, encoded and decoded using macros in <minix/endpoint.h>. proc number -> endpoint migration . proc_nr in the interrupt hook is now an endpoint, proc_nr_e. . m_source for messages and notifies is now an endpoint, instead of proc number. . isokendpt() converts an endpoint to a process number, returns success (but fails if the process number is out of range, the process slot is not a living process, or the given endpoint number does not match the endpoint number in the process slot, indicating an old process). . okendpt() is the same as isokendpt(), but panic()s if the conversion fails. This is mainly used for decoding message.m_source endpoints, and other endpoint numbers in kernel data structures, which should always be correct. . if DEBUG_ENABLE_IPC_WARNINGS is enabled, isokendpt() and okendpt() get passed the __FILE__ and __LINE__ of the calling lines, and print messages about what is wrong with the endpoint number (out of range proc, empty proc, or inconsistent endpoint number), with the caller, making finding where the conversion failed easy without having to include code for every call to print where things went wrong. Sometimes this is harmless (wrong arg to a kernel call), sometimes it's a fatal internal inconsistency (bogus m_source). . some process table fields have been appended an _e to indicate it's become and endpoint. . process endpoint is stored in p_endpoint, without generation number. it turns out the kernel never needs the generation number, except when fork()ing, so it's decoded then. . kernel calls all take endpoints as arguments, not proc numbers. the one exception is sys_fork(), which needs to know in which slot to put the child.
2006-03-03 11:00:02 +01:00
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
#if USE_SETALARM
Replacing timer_t by netbsd's timer_t * Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2013-09-19 10:57:10 +02:00
static void cause_alarm(minix_timer_t *tp);
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
/*===========================================================================*
* do_setalarm *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int do_setalarm(struct proc * caller, message * m_ptr)
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
{
/* A process requests a synchronous alarm, or wants to cancel its alarm. */
long exp_time; /* expiration time for this alarm */
int use_abs_time; /* use absolute or relative time */
Replacing timer_t by netbsd's timer_t * Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2013-09-19 10:57:10 +02:00
minix_timer_t *tp; /* the process' timer structure */
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
clock_t uptime; /* placeholder for current uptime */
/* Extract shared parameters from the request message. */
exp_time = m_ptr->ALRM_EXP_TIME; /* alarm's expiration time */
use_abs_time = m_ptr->ALRM_ABS_TIME; /* flag for absolute time */
This patch removes the global variables who_p and who_e from the kernel (sys task). The main reason is that these would have to become cpu local variables on SMP. Once the system task is not a task but a genuine part of the kernel there is even less reason to have these extra variables as proc_ptr will already contain all neccessary information. In addition converting who_e to the process pointer and back again all the time will be avoided. Although proc_ptr will contain all important information, accessing it as a cpu local variable will be fairly expensive, hence the value would be assigned to some on stack local variable. Therefore it is better to add the 'caller' argument to the syscall handlers to pass the value on stack anyway. It also clearly denotes on who's behalf is the syscall being executed. This patch also ANSIfies the syscall function headers. Last but not least, it also fixes a potential bug in virtual_copy_f() in case the check is disabled. So far the function in case of a failure could possible reuse an old who_p in case this function had not been called from the system task. virtual_copy_f() takes the caller as a parameter too. In case the checking is disabled, the caller must be NULL and non NULL if it is enabled as we must be able to suspend the caller.
2010-02-03 10:04:48 +01:00
if (! (priv(caller)->s_flags & SYS_PROC)) return(EPERM);
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
/* Get the timer structure and set the parameters for this alarm. */
This patch removes the global variables who_p and who_e from the kernel (sys task). The main reason is that these would have to become cpu local variables on SMP. Once the system task is not a task but a genuine part of the kernel there is even less reason to have these extra variables as proc_ptr will already contain all neccessary information. In addition converting who_e to the process pointer and back again all the time will be avoided. Although proc_ptr will contain all important information, accessing it as a cpu local variable will be fairly expensive, hence the value would be assigned to some on stack local variable. Therefore it is better to add the 'caller' argument to the syscall handlers to pass the value on stack anyway. It also clearly denotes on who's behalf is the syscall being executed. This patch also ANSIfies the syscall function headers. Last but not least, it also fixes a potential bug in virtual_copy_f() in case the check is disabled. So far the function in case of a failure could possible reuse an old who_p in case this function had not been called from the system task. virtual_copy_f() takes the caller as a parameter too. In case the checking is disabled, the caller must be NULL and non NULL if it is enabled as we must be able to suspend the caller.
2010-02-03 10:04:48 +01:00
tp = &(priv(caller)->s_alarm_timer);
KCall methods do not depend on m_source and m_type fields - substituted the use of the m_source message field by caller->p_endpoint in kernel calls. It is the same information, just passed more intuitively. - the last dependency on m_type field is removed. - do_unused() is substituted by a check for NULL. - this pretty much removes the depency of kernel calls on the general message format. In the future this may be used to pass the kcall arguments in a different structure or registers (x86-64, ARM?) The kcall number may be passed in a register already.
2010-06-01 10:54:31 +02:00
tmr_arg(tp)->ta_int = caller->p_endpoint;
System processes can be signaled; signals are transformed in SYS_EVENT message that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
2005-07-19 14:21:36 +02:00
tp->tmr_func = cause_alarm;
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
/* Return the ticks left on the previous alarm. */
kernel: rename realtime to monotonic, add realtime Old realtime was used for both timers (where an accurate count of all ticks is needed) and the system time. In order to implement adjtime(2), these duties must be separated as changing the time of day by a small amount shouldn't affect timers in any way nor should it change the boot time. Following the naming of the clocks used by clock_gettime(2). The clock named 'realtime' will represent the best guess at the current wall clock time, and the clock named 'monotonic' will represent the absolute time the system has been running. Use monotonic for timers in kernel and in drivers. Use realtime for determining time of day, dates, etc. This commit simply renames realtime to monotonic and adds a new tick counter named realtime. There are no functional changes in this commit. It just lays the foundation for future work.
2013-03-29 20:34:29 +01:00
uptime = get_monotonic();
Second try to fix tick delay problem ...
2005-08-05 19:02:37 +02:00
if ((tp->tmr_exp_time != TMR_NEVER) && (uptime < tp->tmr_exp_time) ) {
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
m_ptr->ALRM_TIME_LEFT = (tp->tmr_exp_time - uptime);
Second try to fix tick delay problem ...
2005-08-05 19:02:37 +02:00
} else {
m_ptr->ALRM_TIME_LEFT = 0;
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
}
- Fixed comments in various system call handlers. Work in progress on new sys_privctl() call to dynamically start servers and drivers. - Shutdown sequence slightly adjusted: called as watchdog timer to let the busy sys_abort() call from the PM return first. - Changed umap_bios() to have more restrictive check: BIOS memory is now allowed in BIOS_MEM_BEGIN to END (interrupt vectors) and BASE_MEM_TOP to UPPER_MEM_END. Hopefully this keeps QEMU and Bochs happy.
2005-07-21 20:36:40 +02:00
/* Finally, (re)set the timer depending on the expiration time. */
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
if (exp_time == 0) {
Replacing timer_t by netbsd's timer_t * Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2013-09-19 10:57:10 +02:00
reset_kernel_timer(tp);
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
} else {
kernel: rename realtime to monotonic, add realtime Old realtime was used for both timers (where an accurate count of all ticks is needed) and the system time. In order to implement adjtime(2), these duties must be separated as changing the time of day by a small amount shouldn't affect timers in any way nor should it change the boot time. Following the naming of the clocks used by clock_gettime(2). The clock named 'realtime' will represent the best guess at the current wall clock time, and the clock named 'monotonic' will represent the absolute time the system has been running. Use monotonic for timers in kernel and in drivers. Use realtime for determining time of day, dates, etc. This commit simply renames realtime to monotonic and adds a new tick counter named realtime. There are no functional changes in this commit. It just lays the foundation for future work.
2013-03-29 20:34:29 +01:00
tp->tmr_exp_time = (use_abs_time) ? exp_time : exp_time + get_monotonic();
Replacing timer_t by netbsd's timer_t * Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2013-09-19 10:57:10 +02:00
set_kernel_timer(tp, tp->tmr_exp_time, tp->tmr_func);
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
}
return(OK);
}
/*===========================================================================*
* cause_alarm *
*===========================================================================*/
Replacing timer_t by netbsd's timer_t * Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2013-09-19 10:57:10 +02:00
static void cause_alarm(minix_timer_t *tp)
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
{
/* Routine called if a timer goes off and the process requested a synchronous
* alarm. The process number is stored in timer argument 'ta_int'. Notify that
System processes can be signaled; signals are transformed in SYS_EVENT message that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
2005-07-19 14:21:36 +02:00
* process with a notification message from CLOCK.
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
*/
More endpoint_t correctness. More const correctness. Other code cleanup.
2010-06-08 16:09:18 +02:00
endpoint_t proc_nr_e = tmr_arg(tp)->ta_int; /* get process number */
No locking in kernel code - No locking in RTS_(UN)SET macros - No lock_notify() - Removed unused lock_send() - No lock/unlock macros anymore
2010-02-09 16:26:58 +01:00
mini_notify(proc_addr(CLOCK), proc_nr_e); /* notify process */
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
2005-07-14 17:12:12 +02:00
}
#endif /* USE_SETALARM */
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