6f77685609
mainly in the kernel and headers. This split based on work by Ingmar Alting <iaalting@cs.vu.nl> done for his Minix PowerPC architecture port. . kernel does not program the interrupt controller directly, do any other architecture-dependent operations, or contain assembly any more, but uses architecture-dependent functions in arch/$(ARCH)/. . architecture-dependent constants and types defined in arch/$(ARCH)/include. . <ibm/portio.h> moved to <minix/portio.h>, as they have become, for now, architecture-independent functions. . int86, sdevio, readbios, and iopenable are now i386-specific kernel calls and live in arch/i386/do_* now. . i386 arch now supports even less 86 code; e.g. mpx86.s and klib86.s have gone, and 'machine.protected' is gone (and always taken to be 1 in i386). If 86 support is to return, it should be a new architecture. . prototypes for the architecture-dependent functions defined in kernel/arch/$(ARCH)/*.c but used in kernel/ are in kernel/proto.h . /etc/make.conf included in makefiles and shell scripts that need to know the building architecture; it defines ARCH=<arch>, currently only i386. . some basic per-architecture build support outside of the kernel (lib) . in clock.c, only dequeue a process if it was ready . fixes for new include files files deleted: . mpx/klib.s - only for choosing between mpx/klib86 and -386 . klib86.s - only for 86 i386-specific files files moved (or arch-dependent stuff moved) to arch/i386/: . mpx386.s (entry point) . klib386.s . sconst.h . exception.c . protect.c . protect.h . i8269.c
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_NICE
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*
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* The parameters for this kernel call are:
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* m1_i1: PR_ENDPT process number to change priority
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* m1_i2: PR_PRIORITY the new priority
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*/
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#include "../system.h"
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#include <minix/type.h>
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#include <sys/resource.h>
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#if USE_NICE
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/*===========================================================================*
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* do_nice *
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*===========================================================================*/
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PUBLIC int do_nice(message *m_ptr)
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{
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/* Change process priority or stop the process. */
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int proc_nr, pri, new_q ;
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register struct proc *rp;
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/* Extract the message parameters and do sanity checking. */
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if(!isokendpt(m_ptr->PR_ENDPT, &proc_nr)) return EINVAL;
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if (iskerneln(proc_nr)) return(EPERM);
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pri = m_ptr->PR_PRIORITY;
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rp = proc_addr(proc_nr);
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if (pri == PRIO_STOP) {
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/* Take process off the scheduling queues. */
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if(rp->p_rts_flags == 0) lock_dequeue(rp);
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rp->p_rts_flags |= NO_PRIORITY;
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return(OK);
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}
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else if (pri >= PRIO_MIN && pri <= PRIO_MAX) {
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/* The value passed in is currently between PRIO_MIN and PRIO_MAX.
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* We have to scale this between MIN_USER_Q and MAX_USER_Q to match
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* the kernel's scheduling queues.
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*/
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new_q = MAX_USER_Q + (pri-PRIO_MIN) * (MIN_USER_Q-MAX_USER_Q+1) /
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(PRIO_MAX-PRIO_MIN+1);
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if (new_q < MAX_USER_Q) new_q = MAX_USER_Q; /* shouldn't happen */
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if (new_q > MIN_USER_Q) new_q = MIN_USER_Q; /* shouldn't happen */
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/* Make sure the process is not running while changing its priority.
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* Put the process back in its new queue if it is runnable.
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*/
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if(rp->p_rts_flags == 0) lock_dequeue(rp);
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rp->p_rts_flags &= ~NO_PRIORITY;
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rp->p_max_priority = rp->p_priority = new_q;
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if (! rp->p_rts_flags) lock_enqueue(rp);
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return(OK);
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}
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return(EINVAL);
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}
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#endif /* USE_NICE */
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