1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/init.h> 4 #include <linux/ctype.h> 5 #include <linux/pgtable.h> 6 #include <asm/arch-stackprotector.h> 7 #include <asm/abs_lowcore.h> 8 #include <asm/page-states.h> 9 #include <asm/machine.h> 10 #include <asm/ebcdic.h> 11 #include <asm/sclp.h> 12 #include <asm/sections.h> 13 #include <asm/boot_data.h> 14 #include <asm/facility.h> 15 #include <asm/setup.h> 16 #include <asm/uv.h> 17 #include "boot.h" 18 19 struct parmarea parmarea __section(".parmarea") = { 20 .kernel_version = (unsigned long)kernel_version, 21 .max_command_line_size = COMMAND_LINE_SIZE, 22 .command_line = "root=/dev/ram0 ro", 23 }; 24 25 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 26 static char command_line_buf[COMMAND_LINE_SIZE]; 27 28 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL; 29 struct ipl_parameter_block __bootdata_preserved(ipl_block); 30 int __bootdata_preserved(ipl_block_valid); 31 int __bootdata_preserved(__kaslr_enabled); 32 int __bootdata_preserved(cmma_flag) = 1; 33 34 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE; 35 unsigned long memory_limit; 36 int vmalloc_size_set; 37 38 static inline int __diag308(unsigned long subcode, void *addr) 39 { 40 union register_pair r1 = { .even = (unsigned long)addr, .odd = 0 }; 41 42 asm_inline volatile( 43 " diag %[r1],%[subcode],0x308\n" 44 "0:\n" 45 EX_TABLE(0b, 0b) 46 : [r1] "+d" (r1.pair) 47 : [subcode] "d" (subcode) 48 : "cc", "memory"); 49 return r1.odd; 50 } 51 52 void store_ipl_parmblock(void) 53 { 54 int rc; 55 56 rc = __diag308(DIAG308_STORE, &ipl_block); 57 if (rc == DIAG308_RC_OK && 58 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) 59 ipl_block_valid = 1; 60 } 61 62 bool is_ipl_block_dump(void) 63 { 64 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && 65 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) 66 return true; 67 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME && 68 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP) 69 return true; 70 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD && 71 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP) 72 return true; 73 return false; 74 } 75 76 static size_t scpdata_length(const u8 *buf, size_t count) 77 { 78 while (count) { 79 if (buf[count - 1] != '\0' && buf[count - 1] != ' ') 80 break; 81 count--; 82 } 83 return count; 84 } 85 86 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, 87 const struct ipl_parameter_block *ipb) 88 { 89 const __u8 *scp_data; 90 __u32 scp_data_len; 91 int has_lowercase; 92 size_t count = 0; 93 size_t i; 94 95 switch (ipb->pb0_hdr.pbt) { 96 case IPL_PBT_FCP: 97 scp_data_len = ipb->fcp.scp_data_len; 98 scp_data = ipb->fcp.scp_data; 99 break; 100 case IPL_PBT_NVME: 101 scp_data_len = ipb->nvme.scp_data_len; 102 scp_data = ipb->nvme.scp_data; 103 break; 104 case IPL_PBT_ECKD: 105 scp_data_len = ipb->eckd.scp_data_len; 106 scp_data = ipb->eckd.scp_data; 107 break; 108 109 default: 110 goto out; 111 } 112 113 count = min(size - 1, scpdata_length(scp_data, scp_data_len)); 114 if (!count) 115 goto out; 116 117 has_lowercase = 0; 118 for (i = 0; i < count; i++) { 119 if (!isascii(scp_data[i])) { 120 count = 0; 121 goto out; 122 } 123 if (!has_lowercase && islower(scp_data[i])) 124 has_lowercase = 1; 125 } 126 127 if (has_lowercase) 128 memcpy(dest, scp_data, count); 129 else 130 for (i = 0; i < count; i++) 131 dest[i] = tolower(scp_data[i]); 132 out: 133 dest[count] = '\0'; 134 return count; 135 } 136 137 static void append_ipl_block_parm(void) 138 { 139 size_t len, extra = 0; 140 char *delim; 141 142 len = strlen(early_command_line); 143 delim = early_command_line + len; /* '\0' character position */ 144 145 switch (ipl_block.pb0_hdr.pbt) { 146 case IPL_PBT_CCW: 147 extra = ipl_block_get_ascii_vmparm(command_line_buf, sizeof(command_line_buf), &ipl_block); 148 break; 149 case IPL_PBT_FCP: 150 case IPL_PBT_NVME: 151 case IPL_PBT_ECKD: 152 extra = ipl_block_get_ascii_scpdata(command_line_buf, sizeof(command_line_buf), &ipl_block); 153 break; 154 } 155 if (extra) { 156 if (command_line_buf[0] == '=') { 157 memmove(early_command_line, command_line_buf + 1, extra); 158 } else if (len < COMMAND_LINE_SIZE - 2) { 159 *delim = ' '; /* replace '\0' with space */ 160 sized_strscpy(delim + 1, command_line_buf, COMMAND_LINE_SIZE - len - 1); 161 } 162 } 163 } 164 165 static inline int has_ebcdic_char(const char *str) 166 { 167 int i; 168 169 for (i = 0; str[i]; i++) 170 if (str[i] & 0x80) 171 return 1; 172 return 0; 173 } 174 175 void setup_boot_command_line(void) 176 { 177 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; 178 /* convert arch command line to ascii if necessary */ 179 if (has_ebcdic_char(parmarea.command_line)) 180 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); 181 /* copy arch command line */ 182 strscpy(early_command_line, strim(parmarea.command_line)); 183 184 /* append IPL PARM data to the boot command line */ 185 if (!is_prot_virt_guest() && ipl_block_valid) 186 append_ipl_block_parm(); 187 } 188 189 static void modify_facility(unsigned long nr, bool clear) 190 { 191 if (clear) 192 __clear_facility(nr, stfle_fac_list); 193 else 194 __set_facility(nr, stfle_fac_list); 195 } 196 197 static void check_cleared_facilities(void) 198 { 199 unsigned long als[] = { FACILITIES_ALS }; 200 int i; 201 202 for (i = 0; i < ARRAY_SIZE(als); i++) { 203 if ((stfle_fac_list[i] & als[i]) != als[i]) { 204 boot_emerg("The Linux kernel requires facilities cleared via command line option\n"); 205 print_missing_facilities(); 206 break; 207 } 208 } 209 } 210 211 static void modify_fac_list(char *str) 212 { 213 unsigned long val, endval; 214 char *endp; 215 bool clear; 216 217 while (*str) { 218 clear = false; 219 if (*str == '!') { 220 clear = true; 221 str++; 222 } 223 val = simple_strtoull(str, &endp, 0); 224 if (str == endp) 225 break; 226 str = endp; 227 if (*str == '-') { 228 str++; 229 endval = simple_strtoull(str, &endp, 0); 230 if (str == endp) 231 break; 232 str = endp; 233 while (val <= endval && val < MAX_FACILITY_BIT) { 234 modify_facility(val, clear); 235 val++; 236 } 237 } else { 238 modify_facility(val, clear); 239 } 240 if (*str != ',') 241 break; 242 str++; 243 } 244 check_cleared_facilities(); 245 } 246 247 void parse_boot_command_line(void) 248 { 249 char *param, *val; 250 bool enabled; 251 char *args; 252 int rc; 253 254 __kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); 255 strscpy(command_line_buf, early_command_line); 256 args = command_line_buf; 257 while (*args) { 258 args = next_arg(args, ¶m, &val); 259 260 if (!strcmp(param, "mem") && val) 261 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE); 262 263 if (!strcmp(param, "vmalloc") && val) { 264 vmalloc_size = round_up(memparse(val, NULL), _SEGMENT_SIZE); 265 vmalloc_size_set = 1; 266 } 267 268 if (!strcmp(param, "dfltcc") && val) { 269 if (!strcmp(val, "off")) 270 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED; 271 else if (!strcmp(val, "on")) 272 zlib_dfltcc_support = ZLIB_DFLTCC_FULL; 273 else if (!strcmp(val, "def_only")) 274 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY; 275 else if (!strcmp(val, "inf_only")) 276 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY; 277 else if (!strcmp(val, "always")) 278 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG; 279 } 280 281 if (!strcmp(param, "facilities") && val) 282 modify_fac_list(val); 283 284 if (!strcmp(param, "debug-alternative")) 285 alt_debug_setup(val); 286 287 if (!strcmp(param, "nokaslr")) 288 __kaslr_enabled = 0; 289 290 if (!strcmp(param, "cmma")) { 291 rc = kstrtobool(val, &enabled); 292 if (!rc && !enabled) 293 cmma_flag = 0; 294 } 295 296 #ifdef CONFIG_STACKPROTECTOR 297 if (!strcmp(param, "debug_stackprotector")) 298 stack_protector_debug = 1; 299 #endif 300 301 #if IS_ENABLED(CONFIG_KVM) 302 if (!strcmp(param, "prot_virt")) { 303 rc = kstrtobool(val, &enabled); 304 if (!rc && enabled) 305 prot_virt_host = 1; 306 } 307 #endif 308 if (!strcmp(param, "relocate_lowcore") && test_facility(193)) 309 set_machine_feature(MFEATURE_LOWCORE); 310 if (!strcmp(param, "earlyprintk")) 311 boot_earlyprintk = true; 312 if (!strcmp(param, "debug")) 313 boot_console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 314 if (!strcmp(param, "bootdebug")) { 315 bootdebug = true; 316 if (val) 317 strscpy(bootdebug_filter, val); 318 } 319 if (!strcmp(param, "quiet")) 320 boot_console_loglevel = CONSOLE_LOGLEVEL_QUIET; 321 if (!strcmp(param, "ignore_loglevel")) 322 boot_ignore_loglevel = true; 323 if (!strcmp(param, "loglevel")) { 324 boot_console_loglevel = simple_strtoull(val, NULL, 10); 325 if (boot_console_loglevel < CONSOLE_LOGLEVEL_MIN) 326 boot_console_loglevel = CONSOLE_LOGLEVEL_MIN; 327 } 328 } 329 } 330