| 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 <sys/syscall.h> |
| 40 | #include <errno.h> |
| 41 | |
| 42 | #define WARM_CODE |
| 43 | #include "warm.h" |
| 44 | |
| 45 | extern long init_module(void *, unsigned long, const char *); /* provided by glibc */ |
| 46 | |
| 47 | static int warm_fd = -1; |
| 48 | static int kernel_version; |
| 49 | |
| 50 | static void sys_cacheflush(void *start, void *end) |
| 51 | { |
| 52 | #ifdef __ARM_EABI__ |
| 53 | /* EABI version */ |
| 54 | int num = __ARM_NR_cacheflush; |
| 55 | __asm__("mov r0, %0 ;" |
| 56 | "mov r1, %1 ;" |
| 57 | "mov r2, #0 ;" |
| 58 | "mov r7, %2 ;" |
| 59 | "swi 0" : : "r" (start), "r" (end), "r" (num) |
| 60 | : "r0", "r1", "r2", "r3", "r7"); |
| 61 | #else |
| 62 | /* OABI */ |
| 63 | __asm__("mov r0, %0 ;" |
| 64 | "mov r1, %1 ;" |
| 65 | "mov r2, #0 ;" |
| 66 | "swi %2" : : "r" (start), "r" (end), "i" __ARM_NR_cacheflush |
| 67 | : "r0", "r1", "r2", "r3"); |
| 68 | #endif |
| 69 | } |
| 70 | |
| 71 | static int manual_insmod_26(const char *fname, const char *opts) |
| 72 | { |
| 73 | unsigned long len, read_len; |
| 74 | int ret = -1; |
| 75 | void *buff; |
| 76 | FILE *f; |
| 77 | |
| 78 | f = fopen(fname, "rb"); |
| 79 | if (f == NULL) |
| 80 | return -1; |
| 81 | |
| 82 | fseek(f, 0, SEEK_END); |
| 83 | len = ftell(f); |
| 84 | fseek(f, 0, SEEK_SET); |
| 85 | |
| 86 | buff = malloc(len); |
| 87 | if (buff == NULL) |
| 88 | goto fail0; |
| 89 | |
| 90 | read_len = fread(buff, 1, len, f); |
| 91 | if (read_len != len) { |
| 92 | fprintf(stderr, "failed to read module\n"); |
| 93 | goto fail1; |
| 94 | } |
| 95 | |
| 96 | ret = init_module(buff, len, opts); |
| 97 | |
| 98 | fail1: |
| 99 | free(buff); |
| 100 | fail0: |
| 101 | fclose(f); |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | int warm_init(void) |
| 106 | { |
| 107 | struct utsname unm; |
| 108 | char buff1[32], buff2[128]; |
| 109 | int ret; |
| 110 | |
| 111 | warm_fd = open("/proc/warm", O_RDWR); |
| 112 | if (warm_fd >= 0) |
| 113 | return 0; |
| 114 | |
| 115 | memset(&unm, 0, sizeof(unm)); |
| 116 | uname(&unm); |
| 117 | |
| 118 | if (strlen(unm.release) < 3 || unm.release[1] != '.') { |
| 119 | fprintf(stderr, "unexpected version string: %s\n", unm.release); |
| 120 | goto fail; |
| 121 | } |
| 122 | kernel_version = ((unm.release[0] - '0') << 4) | (unm.release[2] - '0'); |
| 123 | |
| 124 | snprintf(buff1, sizeof(buff1), "warm_%s.%s", unm.release, kernel_version >= 0x26 ? "ko" : "o"); |
| 125 | snprintf(buff2, sizeof(buff2), "/sbin/insmod %s verbose=1", buff1); |
| 126 | |
| 127 | /* try to insmod */ |
| 128 | ret = system(buff2); |
| 129 | if (ret != 0) { |
| 130 | fprintf(stderr, "system/insmod failed: %d %d\n", ret, errno); |
| 131 | if (kernel_version >= 0x26) { |
| 132 | ret = manual_insmod_26(buff1, "verbose=1"); |
| 133 | if (ret != 0) |
| 134 | fprintf(stderr, "manual insmod also failed: %d\n", ret); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | warm_fd = open("/proc/warm", O_RDWR); |
| 139 | if (warm_fd >= 0) |
| 140 | return 0; |
| 141 | |
| 142 | fail: |
| 143 | fprintf(stderr, "wARM: can't init, acting as sys_cacheflush wrapper\n"); |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | void warm_finish(void) |
| 148 | { |
| 149 | char cmd[64]; |
| 150 | |
| 151 | if (warm_fd < 0) |
| 152 | return; |
| 153 | |
| 154 | close(warm_fd); |
| 155 | warm_fd = -1; |
| 156 | |
| 157 | if (kernel_version < 0x26) { |
| 158 | struct utsname unm; |
| 159 | memset(&unm, 0, sizeof(unm)); |
| 160 | uname(&unm); |
| 161 | snprintf(cmd, sizeof(cmd), "/sbin/rmmod warm_%s", unm.release); |
| 162 | } |
| 163 | else |
| 164 | strcpy(cmd, "/sbin/rmmod warm"); |
| 165 | |
| 166 | system(cmd); |
| 167 | } |
| 168 | |
| 169 | int warm_cache_op_range(int op, void *addr, unsigned long size) |
| 170 | { |
| 171 | struct warm_cache_op wop; |
| 172 | int ret; |
| 173 | |
| 174 | if (warm_fd < 0) { |
| 175 | /* note that this won't work for warm_cache_op_all */ |
| 176 | sys_cacheflush(addr, (char *)addr + size); |
| 177 | return -1; |
| 178 | } |
| 179 | |
| 180 | wop.ops = op; |
| 181 | wop.addr = (unsigned long)addr; |
| 182 | wop.size = size; |
| 183 | |
| 184 | ret = ioctl(warm_fd, WARMC_CACHE_OP, &wop); |
| 185 | if (ret != 0) { |
| 186 | perror("WARMC_CACHE_OP failed"); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | int warm_cache_op_all(int op) |
| 194 | { |
| 195 | return warm_cache_op_range(op, NULL, (unsigned long)-1); |
| 196 | } |
| 197 | |
| 198 | int warm_change_cb_range(int cb, int is_set, void *addr, unsigned long size) |
| 199 | { |
| 200 | struct warm_change_cb ccb; |
| 201 | int ret; |
| 202 | |
| 203 | if (warm_fd < 0) |
| 204 | return -1; |
| 205 | |
| 206 | ccb.addr = (unsigned long)addr; |
| 207 | ccb.size = size; |
| 208 | ccb.cb = cb; |
| 209 | ccb.is_set = is_set; |
| 210 | |
| 211 | ret = ioctl(warm_fd, WARMC_CHANGE_CB, &ccb); |
| 212 | if (ret != 0) { |
| 213 | perror("WARMC_CHANGE_CB failed"); |
| 214 | return -1; |
| 215 | } |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | int warm_change_cb_upper(int cb, int is_set) |
| 221 | { |
| 222 | return warm_change_cb_range(cb, is_set, 0, 0); |
| 223 | } |
| 224 | |
| 225 | unsigned long warm_virt2phys(const void *ptr) |
| 226 | { |
| 227 | unsigned long ptrio; |
| 228 | int ret; |
| 229 | |
| 230 | ptrio = (unsigned long)ptr; |
| 231 | ret = ioctl(warm_fd, WARMC_VIRT2PHYS, &ptrio); |
| 232 | if (ret != 0) { |
| 233 | perror("WARMC_VIRT2PHYS failed"); |
| 234 | return (unsigned long)-1; |
| 235 | } |
| 236 | |
| 237 | return ptrio; |
| 238 | } |
| 239 | |