89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
#define _SYSTEM 1
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#include <assert.h>
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#include <errno.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ipc.h>
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#include <minix/rs.h>
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#include <minix/type.h>
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#include <stdlib.h>
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#include <timers.h>
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#include <unistd.h>
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#include <machine/archtypes.h>
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#include "../../../kernel/priv.h"
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#include "../../../kernel/proc.h"
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#define SCHED_BITS 9
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#define PRIO_BITS 8
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#define QUANTUM_BITS 14
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#define SCHED_SHIFT 0
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#define PRIO_SHIFT (SCHED_BITS + SCHED_SHIFT)
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#define QUANTUM_SHIFT (PRIO_SHIFT + PRIO_BITS)
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#define ABI_SHIFT (QUANTUM_SHIFT + QUANTUM_BITS)
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#define MAXU(bits) ((unsigned) ((1 << (bits)) - 1))
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#define MINS(bits) ((int) (-(1 << ((bits) - 1))))
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#define MAXS(bits) ((int) ((1 << ((bits) - 1)) - 1))
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#define ENCODE(value, shift, bits) \
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((((unsigned) (value)) & ((1 << (bits)) - 1)) << (shift))
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#define DECODE(value, shift, bits) \
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((((unsigned) (value)) >> (shift)) & ((1 << (bits)) - 1))
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PUBLIC int rss_nice_encode(int *nice, endpoint_t scheduler,
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unsigned priority, unsigned quantum)
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{
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unsigned scheduler_u;
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assert(ABI_SHIFT == 31);
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/* check whether values fit */
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if (!nice) return EINVAL;
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*nice = 0;
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scheduler_u = (unsigned) (scheduler + NR_TASKS);
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if (scheduler_u > MAXU(SCHED_BITS)) return EINVAL;
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if (priority > MAXU(PRIO_BITS)) return EINVAL;
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if (quantum > MAXU(QUANTUM_BITS)) return EINVAL;
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/* encode */
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*nice = ENCODE(scheduler_u, SCHED_SHIFT, SCHED_BITS) |
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ENCODE(priority, PRIO_SHIFT, PRIO_BITS) |
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ENCODE(quantum, QUANTUM_SHIFT, QUANTUM_BITS) |
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ENCODE(1, ABI_SHIFT, 1);
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return OK;
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}
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PUBLIC int rss_nice_decode(int nice, endpoint_t *scheduler,
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unsigned *priority, unsigned *quantum)
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{
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unsigned scheduler_u;
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assert(ABI_SHIFT == 31);
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/* check arguments */
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if (!scheduler) return EINVAL;
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if (!priority) return EINVAL;
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if (!quantum) return EINVAL;
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/* accept either old or new ABI */
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if (nice & (1 << ABI_SHIFT)) {
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/* new ABI, decode */
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scheduler_u = DECODE(nice, SCHED_SHIFT, SCHED_BITS);
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*scheduler = (int) scheduler_u - NR_TASKS;
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*priority = DECODE(nice, PRIO_SHIFT, PRIO_BITS);
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*quantum = DECODE(nice, QUANTUM_SHIFT, QUANTUM_BITS);
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} else {
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/* old ABI, not useful so just take defaults */
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*scheduler = USER_SCH;
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*priority = USER_Q;
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*quantum = USER_QUANTUM;
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}
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return OK;
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}
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