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/*
* wARM - exporting ARM processor specific privileged services to userspace
* userspace part
*
* Copyright (c) Gražvydas "notaz" Ignotas, 2009
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the organization nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <errno.h>
#define WARM_CODE
#include "warm.h"
#include "sys_cacheflush.h"
static int warm_fd = -1;
int warm_init(void)
{
struct utsname unm;
char buff[128];
warm_fd = open("/proc/warm", O_RDWR);
if (warm_fd >= 0)
return 0;
memset(&unm, 0, sizeof(unm));
uname(&unm);
snprintf(buff, sizeof(buff), "/sbin/insmod warm_%s.ko", unm.release);
/* try to insmod */
system(buff);
warm_fd = open("/proc/warm", O_RDWR);
if (warm_fd >= 0)
return 0;
fprintf(stderr, "wARM: can't init, acting as sys_cacheflush wrapper\n");
return -1;
}
void warm_finish(void)
{
if (warm_fd >= 0)
close(warm_fd);
system("rmmod warm");
}
int warm_cache_op_range(int op, void *addr, unsigned long size)
{
struct warm_cache_op wop;
int ret;
if (warm_fd < 0) {
sys_cacheflush(addr, (char *)addr + size);
return -1;
}
wop.ops = op;
wop.addr = (unsigned long)addr;
wop.size = size;
ret = ioctl(warm_fd, WARMC_CACHE_OP, &wop);
if (ret != 0) {
perror("WARMC_CACHE_OP failed");
return -1;
}
return 0;
}
int warm_cache_op_all(int op)
{
return warm_cache_op_range(op, NULL, (size_t)-1);
}
int warm_change_cb_range(int cb, int is_set, void *addr, unsigned long size)
{
struct warm_change_cb ccb;
int ret;
if (warm_fd < 0)
return -1;
ccb.addr = (unsigned long)addr;
ccb.size = size;
ccb.cb = cb;
ccb.is_set = is_set;
ret = ioctl(warm_fd, WARMC_CHANGE_CB, &ccb);
if (ret != 0) {
perror("WARMC_CHANGE_CB failed");
return -1;
}
return 0;
}
int warm_change_cb_upper(int cb, int is_set)
{
return warm_change_cb_range(cb, is_set, 0, 0);
}
unsigned long warm_virt2phys(const void *ptr)
{
unsigned long ptrio;
int ret;
ptrio = (unsigned long)ptr;
ret = ioctl(warm_fd, WARMC_VIRT2PHYS, &ptrio);
if (ret != 0) {
perror("WARMC_VIRT2PHYS failed");
return (unsigned long)-1;
}
return ptrio;
}
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