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b0e1e474f7
hw.pci.host_mem_start tunable. Add comments to TUNABLE_INT and TUNABLE_QUAD recommending against their use. MFC after: 3 weeks
527 lines
10 KiB
C
527 lines
10 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* The unified bootloader passes us a pointer to a preserved copy of
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* bootstrap/kernel environment variables. We convert them to a
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* dynamic array of strings later when the VM subsystem is up.
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*
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* We make these available through the kenv(2) syscall for userland
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* and through getenv()/freeenv() setenv() unsetenv() testenv() for
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* the kernel.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/libkern.h>
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#include <sys/kenv.h>
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MALLOC_DEFINE(M_KENV, "kenv", "kernel environment");
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#define KENV_SIZE 512 /* Maximum number of environment strings */
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/* pointer to the static environment */
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char *kern_envp;
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static char *kernenv_next(char *);
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/* dynamic environment variables */
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char **kenvp;
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struct sx kenv_lock;
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/*
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* No need to protect this with a mutex
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* since SYSINITS are single threaded.
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*/
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int dynamic_kenv = 0;
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#define KENV_CHECK if (!dynamic_kenv) \
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panic("%s: called before SI_SUB_KMEM", __func__)
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int
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kenv(td, uap)
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struct thread *td;
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struct kenv_args /* {
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int what;
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const char *name;
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char *value;
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int len;
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} */ *uap;
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{
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char *name, *value;
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size_t len, done, needed;
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int error, i;
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KASSERT(dynamic_kenv, ("kenv: dynamic_kenv = 0"));
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error = 0;
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if (uap->what == KENV_DUMP) {
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#ifdef MAC
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error = mac_check_kenv_dump(td->td_ucred);
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if (error)
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return (error);
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#endif
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done = needed = 0;
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sx_slock(&kenv_lock);
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for (i = 0; kenvp[i] != NULL; i++) {
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len = strlen(kenvp[i]) + 1;
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needed += len;
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len = min(len, uap->len - done);
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/*
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* If called with a NULL or insufficiently large
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* buffer, just keep computing the required size.
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*/
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if (uap->value != NULL && len > 0) {
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error = copyout(kenvp[i], uap->value + done,
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len);
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if (error)
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break;
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done += len;
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}
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}
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sx_sunlock(&kenv_lock);
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td->td_retval[0] = ((done == needed) ? 0 : needed);
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return (error);
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}
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if ((uap->what == KENV_SET) ||
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(uap->what == KENV_UNSET)) {
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error = suser(td);
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if (error)
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return (error);
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}
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name = malloc(KENV_MNAMELEN, M_TEMP, M_WAITOK);
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error = copyinstr(uap->name, name, KENV_MNAMELEN, NULL);
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if (error)
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goto done;
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switch (uap->what) {
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case KENV_GET:
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#ifdef MAC
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error = mac_check_kenv_get(td->td_ucred, name);
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if (error)
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goto done;
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#endif
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value = getenv(name);
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if (value == NULL) {
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error = ENOENT;
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goto done;
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}
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len = strlen(value) + 1;
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if (len > uap->len)
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len = uap->len;
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error = copyout(value, uap->value, len);
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freeenv(value);
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if (error)
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goto done;
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td->td_retval[0] = len;
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break;
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case KENV_SET:
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len = uap->len;
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if (len < 1) {
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error = EINVAL;
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goto done;
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}
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if (len > KENV_MVALLEN)
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len = KENV_MVALLEN;
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value = malloc(len, M_TEMP, M_WAITOK);
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error = copyinstr(uap->value, value, len, NULL);
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if (error) {
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free(value, M_TEMP);
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goto done;
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}
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#ifdef MAC
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error = mac_check_kenv_set(td->td_ucred, name, value);
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if (error == 0)
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#endif
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setenv(name, value);
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free(value, M_TEMP);
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break;
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case KENV_UNSET:
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#ifdef MAC
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error = mac_check_kenv_unset(td->td_ucred, name);
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if (error)
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goto done;
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#endif
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error = unsetenv(name);
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if (error)
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error = ENOENT;
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break;
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default:
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error = EINVAL;
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break;
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}
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done:
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free(name, M_TEMP);
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return (error);
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}
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/*
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* Setup the dynamic kernel environment.
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*/
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static void
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init_dynamic_kenv(void *data __unused)
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{
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char *cp;
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int len, i;
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kenvp = malloc(KENV_SIZE * sizeof(char *), M_KENV, M_WAITOK | M_ZERO);
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i = 0;
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for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
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len = strlen(cp) + 1;
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kenvp[i] = malloc(len, M_KENV, M_WAITOK);
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strcpy(kenvp[i++], cp);
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}
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kenvp[i] = NULL;
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sx_init(&kenv_lock, "kernel environment");
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dynamic_kenv = 1;
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}
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SYSINIT(kenv, SI_SUB_KMEM, SI_ORDER_ANY, init_dynamic_kenv, NULL);
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void
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freeenv(char *env)
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{
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if (dynamic_kenv)
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free(env, M_KENV);
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}
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/*
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* Internal functions for string lookup.
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*/
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static char *
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_getenv_dynamic(const char *name, int *idx)
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{
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char *cp;
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int len, i;
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sx_assert(&kenv_lock, SX_LOCKED);
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len = strlen(name);
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for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) {
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if ((cp[len] == '=') &&
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(strncmp(cp, name, len) == 0)) {
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if (idx != NULL)
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*idx = i;
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return (cp + len + 1);
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}
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}
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return (NULL);
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}
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static char *
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_getenv_static(const char *name)
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{
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char *cp, *ep;
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int len;
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for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
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for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
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;
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if (*ep != '=')
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continue;
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len = ep - cp;
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ep++;
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if (!strncmp(name, cp, len) && name[len] == 0)
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return (ep);
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}
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return (NULL);
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}
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/*
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* Look up an environment variable by name.
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* Return a pointer to the string if found.
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* The pointer has to be freed with freeenv()
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* after use.
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*/
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char *
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getenv(const char *name)
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{
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char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1];
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char *ret, *cp;
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int len;
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if (dynamic_kenv) {
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sx_slock(&kenv_lock);
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cp = _getenv_dynamic(name, NULL);
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if (cp != NULL) {
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strcpy(buf, cp);
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sx_sunlock(&kenv_lock);
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len = strlen(buf) + 1;
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ret = malloc(len, M_KENV, M_WAITOK);
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strcpy(ret, buf);
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} else {
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sx_sunlock(&kenv_lock);
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ret = NULL;
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}
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} else
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ret = _getenv_static(name);
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return (ret);
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}
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/*
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* Test if an environment variable is defined.
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*/
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int
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testenv(const char *name)
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{
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char *cp;
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if (dynamic_kenv) {
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sx_slock(&kenv_lock);
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cp = _getenv_dynamic(name, NULL);
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sx_sunlock(&kenv_lock);
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} else
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cp = _getenv_static(name);
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if (cp != NULL)
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return (1);
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return (0);
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}
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/*
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* Set an environment variable by name.
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*/
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int
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setenv(const char *name, const char *value)
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{
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char *buf, *cp, *oldenv;
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int namelen, vallen, i;
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KENV_CHECK;
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namelen = strlen(name) + 1;
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if (namelen > KENV_MNAMELEN)
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return (-1);
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vallen = strlen(value) + 1;
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if (vallen > KENV_MVALLEN)
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return (-1);
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buf = malloc(namelen + vallen, M_KENV, M_WAITOK);
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sprintf(buf, "%s=%s", name, value);
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sx_xlock(&kenv_lock);
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cp = _getenv_dynamic(name, &i);
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if (cp != NULL) {
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oldenv = kenvp[i];
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kenvp[i] = buf;
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sx_xunlock(&kenv_lock);
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free(oldenv, M_KENV);
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} else {
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/* We add the option if it wasn't found */
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for (i = 0; (cp = kenvp[i]) != NULL; i++)
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;
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kenvp[i] = buf;
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kenvp[i + 1] = NULL;
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sx_xunlock(&kenv_lock);
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}
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return (0);
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}
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/*
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* Unset an environment variable string.
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*/
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int
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unsetenv(const char *name)
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{
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char *cp, *oldenv;
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int i, j;
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KENV_CHECK;
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sx_xlock(&kenv_lock);
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cp = _getenv_dynamic(name, &i);
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if (cp != NULL) {
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oldenv = kenvp[i];
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for (j = i + 1; kenvp[j] != NULL; j++)
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kenvp[i++] = kenvp[j];
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kenvp[i] = NULL;
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sx_xunlock(&kenv_lock);
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free(oldenv, M_KENV);
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return (0);
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}
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sx_xunlock(&kenv_lock);
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return (-1);
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}
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/*
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* Return a string value from an environment variable.
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*/
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int
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getenv_string(const char *name, char *data, int size)
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{
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char *tmp;
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tmp = getenv(name);
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if (tmp != NULL) {
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strlcpy(data, tmp, size);
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freeenv(tmp);
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return (1);
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} else
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return (0);
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}
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/*
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* Return an integer value from an environment variable.
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*/
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int
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getenv_int(const char *name, int *data)
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{
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quad_t tmp;
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int rval;
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rval = getenv_quad(name, &tmp);
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if (rval)
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*data = (int) tmp;
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return (rval);
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}
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/*
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* Return a long value from an environment variable.
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*/
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long
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getenv_long(const char *name, long *data)
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{
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quad_t tmp;
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long rval;
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rval = getenv_quad(name, &tmp);
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if (rval)
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*data = (long) tmp;
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return (rval);
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}
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/*
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* Return an unsigned long value from an environment variable.
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*/
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unsigned long
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getenv_ulong(const char *name, unsigned long *data)
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{
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quad_t tmp;
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long rval;
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rval = getenv_quad(name, &tmp);
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if (rval)
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*data = (unsigned long) tmp;
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return (rval);
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}
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/*
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* Return a quad_t value from an environment variable.
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*/
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int
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getenv_quad(const char *name, quad_t *data)
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{
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char *value;
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char *vtp;
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quad_t iv;
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value = getenv(name);
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if (value == NULL)
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return (0);
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iv = strtoq(value, &vtp, 0);
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if ((vtp == value) || (*vtp != '\0')) {
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freeenv(value);
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return (0);
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}
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freeenv(value);
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*data = iv;
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return (1);
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}
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/*
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* Find the next entry after the one which (cp) falls within, return a
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* pointer to its start or NULL if there are no more.
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*/
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static char *
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kernenv_next(char *cp)
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{
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if (cp != NULL) {
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while (*cp != 0)
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cp++;
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cp++;
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if (*cp == 0)
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cp = NULL;
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}
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return (cp);
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}
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void
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tunable_int_init(void *data)
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{
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struct tunable_int *d = (struct tunable_int *)data;
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TUNABLE_INT_FETCH(d->path, d->var);
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}
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void
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tunable_long_init(void *data)
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{
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struct tunable_long *d = (struct tunable_long *)data;
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TUNABLE_LONG_FETCH(d->path, d->var);
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}
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void
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tunable_ulong_init(void *data)
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{
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struct tunable_ulong *d = (struct tunable_ulong *)data;
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TUNABLE_ULONG_FETCH(d->path, d->var);
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}
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void
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tunable_quad_init(void *data)
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{
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struct tunable_quad *d = (struct tunable_quad *)data;
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TUNABLE_QUAD_FETCH(d->path, d->var);
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}
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void
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tunable_str_init(void *data)
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{
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struct tunable_str *d = (struct tunable_str *)data;
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TUNABLE_STR_FETCH(d->path, d->var, d->size);
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}
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