| 1 | /* |
| 2 | * wARM - exporting ARM processor specific privileged services to userspace |
| 3 | * userspace part |
| 4 | * |
| 5 | * Copyright (c) GraÅžvydas "notaz" Ignotas, 2009 |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions are met: |
| 9 | * * Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * * Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * * Neither the name of the organization nor the |
| 15 | * names of its contributors may be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include <stdio.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <string.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <unistd.h> |
| 36 | #include <fcntl.h> |
| 37 | #include <sys/ioctl.h> |
| 38 | #include <sys/utsname.h> |
| 39 | #include <errno.h> |
| 40 | |
| 41 | #define WARM_CODE |
| 42 | #include "warm.h" |
| 43 | #include "sys_cacheflush.h" |
| 44 | |
| 45 | static int warm_fd = -1; |
| 46 | |
| 47 | int warm_init(void) |
| 48 | { |
| 49 | struct utsname unm; |
| 50 | char buff[128]; |
| 51 | |
| 52 | warm_fd = open("/proc/warm", O_RDWR); |
| 53 | if (warm_fd >= 0) |
| 54 | return 0; |
| 55 | |
| 56 | memset(&unm, 0, sizeof(unm)); |
| 57 | uname(&unm); |
| 58 | snprintf(buff, sizeof(buff), "/sbin/insmod warm_%s.ko verbose=1", unm.release); |
| 59 | |
| 60 | /* try to insmod */ |
| 61 | system(buff); |
| 62 | warm_fd = open("/proc/warm", O_RDWR); |
| 63 | if (warm_fd >= 0) |
| 64 | return 0; |
| 65 | |
| 66 | fprintf(stderr, "wARM: can't init, acting as sys_cacheflush wrapper\n"); |
| 67 | return -1; |
| 68 | } |
| 69 | |
| 70 | void warm_finish(void) |
| 71 | { |
| 72 | if (warm_fd >= 0) |
| 73 | close(warm_fd); |
| 74 | system("rmmod warm"); |
| 75 | } |
| 76 | |
| 77 | int warm_cache_op_range(int op, void *addr, unsigned long size) |
| 78 | { |
| 79 | struct warm_cache_op wop; |
| 80 | int ret; |
| 81 | |
| 82 | if (warm_fd < 0) { |
| 83 | sys_cacheflush(addr, (char *)addr + size); |
| 84 | return -1; |
| 85 | } |
| 86 | |
| 87 | wop.ops = op; |
| 88 | wop.addr = (unsigned long)addr; |
| 89 | wop.size = size; |
| 90 | |
| 91 | ret = ioctl(warm_fd, WARMC_CACHE_OP, &wop); |
| 92 | if (ret != 0) { |
| 93 | perror("WARMC_CACHE_OP failed"); |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | int warm_cache_op_all(int op) |
| 101 | { |
| 102 | return warm_cache_op_range(op, NULL, (size_t)-1); |
| 103 | } |
| 104 | |
| 105 | int warm_change_cb_range(int cb, int is_set, void *addr, unsigned long size) |
| 106 | { |
| 107 | struct warm_change_cb ccb; |
| 108 | int ret; |
| 109 | |
| 110 | if (warm_fd < 0) |
| 111 | return -1; |
| 112 | |
| 113 | ccb.addr = (unsigned long)addr; |
| 114 | ccb.size = size; |
| 115 | ccb.cb = cb; |
| 116 | ccb.is_set = is_set; |
| 117 | |
| 118 | ret = ioctl(warm_fd, WARMC_CHANGE_CB, &ccb); |
| 119 | if (ret != 0) { |
| 120 | perror("WARMC_CHANGE_CB failed"); |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | int warm_change_cb_upper(int cb, int is_set) |
| 128 | { |
| 129 | return warm_change_cb_range(cb, is_set, 0, 0); |
| 130 | } |
| 131 | |
| 132 | unsigned long warm_virt2phys(const void *ptr) |
| 133 | { |
| 134 | unsigned long ptrio; |
| 135 | int ret; |
| 136 | |
| 137 | ptrio = (unsigned long)ptr; |
| 138 | ret = ioctl(warm_fd, WARMC_VIRT2PHYS, &ptrio); |
| 139 | if (ret != 0) { |
| 140 | perror("WARMC_VIRT2PHYS failed"); |
| 141 | return (unsigned long)-1; |
| 142 | } |
| 143 | |
| 144 | return ptrio; |
| 145 | } |
| 146 | |