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/ebcdic.h> 7 #include <asm/sclp.h> 8 #include <asm/sections.h> 9 #include <asm/boot_data.h> 10 #include <asm/facility.h> 11 #include <asm/setup.h> 12 #include <asm/uv.h> 13 #include "boot.h" 14 15 struct parmarea parmarea __section(".parmarea") = { 16 .kernel_version = (unsigned long)kernel_version, 17 .max_command_line_size = COMMAND_LINE_SIZE, 18 .command_line = "root=/dev/ram0 ro", 19 }; 20 21 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 22 int __bootdata(noexec_disabled); 23 24 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL; 25 struct ipl_parameter_block __bootdata_preserved(ipl_block); 26 int __bootdata_preserved(ipl_block_valid); 27 28 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE; 29 unsigned long memory_limit; 30 int vmalloc_size_set; 31 int kaslr_enabled; 32 33 static inline int __diag308(unsigned long subcode, void *addr) 34 { 35 unsigned long reg1, reg2; 36 union register_pair r1; 37 psw_t old; 38 39 r1.even = (unsigned long) addr; 40 r1.odd = 0; 41 asm volatile( 42 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n" 43 " epsw %[reg1],%[reg2]\n" 44 " st %[reg1],0(%[psw_pgm])\n" 45 " st %[reg2],4(%[psw_pgm])\n" 46 " larl %[reg1],1f\n" 47 " stg %[reg1],8(%[psw_pgm])\n" 48 " diag %[r1],%[subcode],0x308\n" 49 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n" 50 : [r1] "+&d" (r1.pair), 51 [reg1] "=&d" (reg1), 52 [reg2] "=&a" (reg2), 53 "+Q" (S390_lowcore.program_new_psw), 54 "=Q" (old) 55 : [subcode] "d" (subcode), 56 [psw_old] "a" (&old), 57 [psw_pgm] "a" (&S390_lowcore.program_new_psw) 58 : "cc", "memory"); 59 return r1.odd; 60 } 61 62 void store_ipl_parmblock(void) 63 { 64 int rc; 65 66 rc = __diag308(DIAG308_STORE, &ipl_block); 67 if (rc == DIAG308_RC_OK && 68 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) 69 ipl_block_valid = 1; 70 } 71 72 bool is_ipl_block_dump(void) 73 { 74 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && 75 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) 76 return true; 77 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME && 78 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP) 79 return true; 80 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD && 81 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP) 82 return true; 83 return false; 84 } 85 86 static size_t scpdata_length(const u8 *buf, size_t count) 87 { 88 while (count) { 89 if (buf[count - 1] != '\0' && buf[count - 1] != ' ') 90 break; 91 count--; 92 } 93 return count; 94 } 95 96 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, 97 const struct ipl_parameter_block *ipb) 98 { 99 const __u8 *scp_data; 100 __u32 scp_data_len; 101 int has_lowercase; 102 size_t count = 0; 103 size_t i; 104 105 switch (ipb->pb0_hdr.pbt) { 106 case IPL_PBT_FCP: 107 scp_data_len = ipb->fcp.scp_data_len; 108 scp_data = ipb->fcp.scp_data; 109 break; 110 case IPL_PBT_NVME: 111 scp_data_len = ipb->nvme.scp_data_len; 112 scp_data = ipb->nvme.scp_data; 113 break; 114 case IPL_PBT_ECKD: 115 scp_data_len = ipb->eckd.scp_data_len; 116 scp_data = ipb->eckd.scp_data; 117 break; 118 119 default: 120 goto out; 121 } 122 123 count = min(size - 1, scpdata_length(scp_data, scp_data_len)); 124 if (!count) 125 goto out; 126 127 has_lowercase = 0; 128 for (i = 0; i < count; i++) { 129 if (!isascii(scp_data[i])) { 130 count = 0; 131 goto out; 132 } 133 if (!has_lowercase && islower(scp_data[i])) 134 has_lowercase = 1; 135 } 136 137 if (has_lowercase) 138 memcpy(dest, scp_data, count); 139 else 140 for (i = 0; i < count; i++) 141 dest[i] = tolower(scp_data[i]); 142 out: 143 dest[count] = '\0'; 144 return count; 145 } 146 147 static void append_ipl_block_parm(void) 148 { 149 char *parm, *delim; 150 size_t len, rc = 0; 151 152 len = strlen(early_command_line); 153 154 delim = early_command_line + len; /* '\0' character position */ 155 parm = early_command_line + len + 1; /* append right after '\0' */ 156 157 switch (ipl_block.pb0_hdr.pbt) { 158 case IPL_PBT_CCW: 159 rc = ipl_block_get_ascii_vmparm( 160 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 161 break; 162 case IPL_PBT_FCP: 163 case IPL_PBT_NVME: 164 case IPL_PBT_ECKD: 165 rc = ipl_block_get_ascii_scpdata( 166 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 167 break; 168 } 169 if (rc) { 170 if (*parm == '=') 171 memmove(early_command_line, parm + 1, rc); 172 else 173 *delim = ' '; /* replace '\0' with space */ 174 } 175 } 176 177 static inline int has_ebcdic_char(const char *str) 178 { 179 int i; 180 181 for (i = 0; str[i]; i++) 182 if (str[i] & 0x80) 183 return 1; 184 return 0; 185 } 186 187 void setup_boot_command_line(void) 188 { 189 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; 190 /* convert arch command line to ascii if necessary */ 191 if (has_ebcdic_char(parmarea.command_line)) 192 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); 193 /* copy arch command line */ 194 strcpy(early_command_line, strim(parmarea.command_line)); 195 196 /* append IPL PARM data to the boot command line */ 197 if (!is_prot_virt_guest() && ipl_block_valid) 198 append_ipl_block_parm(); 199 } 200 201 static void modify_facility(unsigned long nr, bool clear) 202 { 203 if (clear) 204 __clear_facility(nr, stfle_fac_list); 205 else 206 __set_facility(nr, stfle_fac_list); 207 } 208 209 static void check_cleared_facilities(void) 210 { 211 unsigned long als[] = { FACILITIES_ALS }; 212 int i; 213 214 for (i = 0; i < ARRAY_SIZE(als); i++) { 215 if ((stfle_fac_list[i] & als[i]) != als[i]) { 216 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); 217 print_missing_facilities(); 218 break; 219 } 220 } 221 } 222 223 static void modify_fac_list(char *str) 224 { 225 unsigned long val, endval; 226 char *endp; 227 bool clear; 228 229 while (*str) { 230 clear = false; 231 if (*str == '!') { 232 clear = true; 233 str++; 234 } 235 val = simple_strtoull(str, &endp, 0); 236 if (str == endp) 237 break; 238 str = endp; 239 if (*str == '-') { 240 str++; 241 endval = simple_strtoull(str, &endp, 0); 242 if (str == endp) 243 break; 244 str = endp; 245 while (val <= endval) { 246 modify_facility(val, clear); 247 val++; 248 } 249 } else { 250 modify_facility(val, clear); 251 } 252 if (*str != ',') 253 break; 254 str++; 255 } 256 check_cleared_facilities(); 257 } 258 259 static char command_line_buf[COMMAND_LINE_SIZE]; 260 void parse_boot_command_line(void) 261 { 262 char *param, *val; 263 bool enabled; 264 char *args; 265 int rc; 266 267 kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); 268 args = strcpy(command_line_buf, early_command_line); 269 while (*args) { 270 args = next_arg(args, ¶m, &val); 271 272 if (!strcmp(param, "mem") && val) 273 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE); 274 275 if (!strcmp(param, "vmalloc") && val) { 276 vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE); 277 vmalloc_size_set = 1; 278 } 279 280 if (!strcmp(param, "dfltcc") && val) { 281 if (!strcmp(val, "off")) 282 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED; 283 else if (!strcmp(val, "on")) 284 zlib_dfltcc_support = ZLIB_DFLTCC_FULL; 285 else if (!strcmp(val, "def_only")) 286 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY; 287 else if (!strcmp(val, "inf_only")) 288 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY; 289 else if (!strcmp(val, "always")) 290 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG; 291 } 292 293 if (!strcmp(param, "noexec")) { 294 rc = kstrtobool(val, &enabled); 295 if (!rc && !enabled) 296 noexec_disabled = 1; 297 } 298 299 if (!strcmp(param, "facilities") && val) 300 modify_fac_list(val); 301 302 if (!strcmp(param, "nokaslr")) 303 kaslr_enabled = 0; 304 305 #if IS_ENABLED(CONFIG_KVM) 306 if (!strcmp(param, "prot_virt")) { 307 rc = kstrtobool(val, &enabled); 308 if (!rc && enabled) 309 prot_virt_host = 1; 310 } 311 #endif 312 } 313 } 314