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Make service ABI backwards compatible again

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This commit is contained in:
Erik van der Kouwe 2010-07-03 05:02:59 +00:00
parent 34a2864e27
commit 37325bd7c5
6 changed files with 129 additions and 22 deletions
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24
commands/service/service.c
View file

@ -123,6 +123,9 @@ PRIVATE int req_lu_maxtime = DEFAULT_LU_MAXTIME;
PRIVATE char command[4096];
/* Arguments for RS to start a new service */
PRIVATE endpoint_t rss_scheduler;
PRIVATE unsigned rss_priority;
PRIVATE unsigned rss_quantum;
PRIVATE struct rs_start rs_start;
/* An error occurred. Report the problem, print the usage, and exit.
@ -567,7 +570,7 @@ PRIVATE void do_scheduler(config_t *cpe)
fatal("do_scheduler: scheduler %d out of range at %s:%d",
scheduler_val, cpe->file, cpe->line);
}
rs_start.rss_scheduler= (endpoint_t) scheduler_val;
rss_scheduler= (endpoint_t) scheduler_val;
}
PRIVATE void do_priority(config_t *cpe)
@ -605,7 +608,7 @@ PRIVATE void do_priority(config_t *cpe)
fatal("do_priority: priority %d out of range at %s:%d",
priority_val, cpe->file, cpe->line);
}
rs_start.rss_priority= (unsigned) priority_val;
rss_priority= (unsigned) priority_val;
}
PRIVATE void do_quantum(config_t *cpe)
@ -643,7 +646,7 @@ PRIVATE void do_quantum(config_t *cpe)
fatal("do_quantum: quantum %d out of range at %s:%d",
quantum_val, cpe->file, cpe->line);
}
rs_start.rss_quantum= (unsigned) quantum_val;
rss_quantum= (unsigned) quantum_val;
}
PRIVATE void do_irq(config_t *cpe)
@ -1217,14 +1220,21 @@ PUBLIC int main(int argc, char **argv)
fatal("no passwd file entry for '%s'", SERVICE_LOGIN);
rs_start.rss_uid= pw->pw_uid;
rs_start.rss_scheduler= SCHED_PROC_NR;
rs_start.rss_priority= USER_Q;
rs_start.rss_quantum= 200;
rss_scheduler= SCHED_PROC_NR;
rss_priority= USER_Q;
rss_quantum= 200;
if (req_config) {
assert(progname);
do_config(progname, req_config);
}
assert(rss_priority < NR_SCHED_QUEUES);
assert(rss_quantum > 0);
if (rss_nice_encode(&rs_start.rss_nice, rss_scheduler,
rss_priority, rss_quantum) != OK) {
fatal("cannot encode scheduling parameters %d, %u, %u",
rss_scheduler, rss_priority, rss_quantum);
}
if (req_ipc)
{
@ -1237,8 +1247,6 @@ PUBLIC int main(int argc, char **argv)
rs_start.rss_ipclen= 0;
}
assert(rs_start.rss_priority < NR_SCHED_QUEUES);
assert(rs_start.rss_quantum > 0);
m.RS_CMD_ADDR = (char *) &rs_start;
break;
case RS_DOWN:

8
include/minix/rs.h
View file

@ -42,9 +42,7 @@ struct rs_start
char *rss_cmd;
size_t rss_cmdlen;
uid_t rss_uid;
endpoint_t rss_scheduler;
unsigned rss_priority;
unsigned rss_quantum;
int rss_nice; /* use rss_nice_encode and _decode */
int rss_major;
int rss_dev_style;
long rss_period;
@ -99,5 +97,9 @@ struct rprocpub {
};
_PROTOTYPE( int minix_rs_lookup, (const char *name, endpoint_t *value));
_PROTOTYPE(int rss_nice_encode, (int *nice, endpoint_t scheduler,
unsigned priority, unsigned quantum));
_PROTOTYPE(int rss_nice_decode, (int nice, endpoint_t *scheduler,
unsigned *priority, unsigned *quantum));
#endif

1
lib/libc/other/Makefile.inc
View file

@ -88,6 +88,7 @@ SRCS+= \
realpath.c \
rindex.c \
rlimit.c \
rss_nice.c \
setenv.c \
setmode.c \
settimeofday.c \

88
lib/libc/other/rss_nice.c Normal file
View file

@ -0,0 +1,88 @@
#define _SYSTEM 1
#include <assert.h>
#include <errno.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/ipc.h>
#include <minix/rs.h>
#include <minix/type.h>
#include <stdlib.h>
#include <timers.h>
#include <unistd.h>
#include <machine/archtypes.h>
#include "../../../kernel/priv.h"
#include "../../../kernel/proc.h"
#define SCHED_BITS 9
#define PRIO_BITS 8
#define QUANTUM_BITS 14
#define SCHED_SHIFT 0
#define PRIO_SHIFT (SCHED_BITS + SCHED_SHIFT)
#define QUANTUM_SHIFT (PRIO_SHIFT + PRIO_BITS)
#define ABI_SHIFT (QUANTUM_SHIFT + QUANTUM_BITS)
#define MAXU(bits) ((unsigned) ((1 << (bits)) - 1))
#define MINS(bits) ((int) (-(1 << ((bits) - 1))))
#define MAXS(bits) ((int) ((1 << ((bits) - 1)) - 1))
#define ENCODE(value, shift, bits) \
((((unsigned) (value)) & ((1 << (bits)) - 1)) << (shift))
#define DECODE(value, shift, bits) \
((((unsigned) (value)) >> (shift)) & ((1 << (bits)) - 1))
PUBLIC int rss_nice_encode(int *nice, endpoint_t scheduler,
unsigned priority, unsigned quantum)
{
unsigned scheduler_u;
assert(ABI_SHIFT == 31);
/* check whether values fit */
if (!nice) return EINVAL;
*nice = 0;
scheduler_u = (unsigned) (scheduler + NR_TASKS);
if (scheduler_u > MAXU(SCHED_BITS)) return EINVAL;
if (priority > MAXU(PRIO_BITS)) return EINVAL;
if (quantum > MAXU(QUANTUM_BITS)) return EINVAL;
/* encode */
*nice = ENCODE(scheduler_u, SCHED_SHIFT, SCHED_BITS) |
ENCODE(priority, PRIO_SHIFT, PRIO_BITS) |
ENCODE(quantum, QUANTUM_SHIFT, QUANTUM_BITS) |
ENCODE(1, ABI_SHIFT, 1);
return OK;
}
PUBLIC int rss_nice_decode(int nice, endpoint_t *scheduler,
unsigned *priority, unsigned *quantum)
{
unsigned scheduler_u;
assert(ABI_SHIFT == 31);
/* check arguments */
if (!scheduler) return EINVAL;
if (!priority) return EINVAL;
if (!quantum) return EINVAL;
/* accept either old or new ABI */
if (nice & (1 << ABI_SHIFT)) {
/* new ABI, decode */
scheduler_u = DECODE(nice, SCHED_SHIFT, SCHED_BITS);
*scheduler = (int) scheduler_u - NR_TASKS;
*priority = DECODE(nice, PRIO_SHIFT, PRIO_BITS);
*quantum = DECODE(nice, QUANTUM_SHIFT, QUANTUM_BITS);
} else {
/* old ABI, not useful so just take defaults */
*scheduler = USER_SCH;
*priority = USER_Q;
*quantum = USER_QUANTUM;
}
return OK;
}

6
servers/rs/manager.c
View file

@ -1281,9 +1281,9 @@ endpoint_t source;
}
rp->r_uid= rs_start->rss_uid;
rp->r_scheduler= rs_start->rss_scheduler;
rp->r_priority= rs_start->rss_priority;
rp->r_quantum= rs_start->rss_quantum;
s = rss_nice_decode(rs_start->rss_nice, &rp->r_scheduler,
&rp->r_priority, &rp->r_quantum);
if (s != OK) return(s);
if (rs_start->rss_flags & RSS_IPC_VALID)
{

24
servers/rs/request.c
View file

@ -787,22 +787,30 @@ message *m_ptr;
*===========================================================================*/
PRIVATE int check_request(struct rs_start *rs_start)
{
int s;
endpoint_t rss_scheduler;
unsigned rss_priority, rss_quantum;
s = rss_nice_decode(rs_start->rss_nice, &rss_scheduler,
&rss_priority, &rss_quantum);
if (s != OK) return s;
/* Verify scheduling parameters */
if (rs_start->rss_scheduler != KERNEL &&
(rs_start->rss_scheduler < 0 ||
rs_start->rss_scheduler > LAST_SPECIAL_PROC_NR)) {
if (rss_scheduler != KERNEL &&
(rss_scheduler < 0 ||
rss_scheduler > LAST_SPECIAL_PROC_NR)) {
printf("RS: check_request: invalid scheduler %d\n",
rs_start->rss_scheduler);
rss_scheduler);
return EINVAL;
}
if (rs_start->rss_priority >= NR_SCHED_QUEUES) {
if (rss_priority >= NR_SCHED_QUEUES) {
printf("RS: check_request: priority %u out of range\n",
rs_start->rss_priority);
rss_priority);
return EINVAL;
}
if (rs_start->rss_quantum <= 0) {
if (rss_quantum <= 0) {
printf("RS: check_request: quantum %u out of range\n",
rs_start->rss_quantum);
rss_quantum);
return EINVAL;
}