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/page-states.h> 7 #include <asm/ebcdic.h> 8 #include <asm/sclp.h> 9 #include <asm/sections.h> 10 #include <asm/boot_data.h> 11 #include <asm/facility.h> 12 #include <asm/setup.h> 13 #include <asm/uv.h> 14 #include "boot.h" 15 16 struct parmarea parmarea __section(".parmarea") = { 17 .kernel_version = (unsigned long)kernel_version, 18 .max_command_line_size = COMMAND_LINE_SIZE, 19 .command_line = "root=/dev/ram0 ro", 20 }; 21 22 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 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 int __bootdata_preserved(__kaslr_enabled); 28 int __bootdata_preserved(cmma_flag) = 1; 29 30 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE; 31 unsigned long memory_limit; 32 int vmalloc_size_set; 33 34 static inline int __diag308(unsigned long subcode, void *addr) 35 { 36 unsigned long reg1, reg2; 37 union register_pair r1; 38 psw_t old; 39 40 r1.even = (unsigned long) addr; 41 r1.odd = 0; 42 asm volatile( 43 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n" 44 " epsw %[reg1],%[reg2]\n" 45 " st %[reg1],0(%[psw_pgm])\n" 46 " st %[reg2],4(%[psw_pgm])\n" 47 " larl %[reg1],1f\n" 48 " stg %[reg1],8(%[psw_pgm])\n" 49 " diag %[r1],%[subcode],0x308\n" 50 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n" 51 : [r1] "+&d" (r1.pair), 52 [reg1] "=&d" (reg1), 53 [reg2] "=&a" (reg2), 54 "+Q" (S390_lowcore.program_new_psw), 55 "=Q" (old) 56 : [subcode] "d" (subcode), 57 [psw_old] "a" (&old), 58 [psw_pgm] "a" (&S390_lowcore.program_new_psw) 59 : "cc", "memory"); 60 return r1.odd; 61 } 62 63 void store_ipl_parmblock(void) 64 { 65 int rc; 66 67 rc = __diag308(DIAG308_STORE, &ipl_block); 68 if (rc == DIAG308_RC_OK && 69 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) 70 ipl_block_valid = 1; 71 } 72 73 bool is_ipl_block_dump(void) 74 { 75 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && 76 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) 77 return true; 78 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME && 79 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP) 80 return true; 81 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD && 82 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP) 83 return true; 84 return false; 85 } 86 87 static size_t scpdata_length(const u8 *buf, size_t count) 88 { 89 while (count) { 90 if (buf[count - 1] != '\0' && buf[count - 1] != ' ') 91 break; 92 count--; 93 } 94 return count; 95 } 96 97 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, 98 const struct ipl_parameter_block *ipb) 99 { 100 const __u8 *scp_data; 101 __u32 scp_data_len; 102 int has_lowercase; 103 size_t count = 0; 104 size_t i; 105 106 switch (ipb->pb0_hdr.pbt) { 107 case IPL_PBT_FCP: 108 scp_data_len = ipb->fcp.scp_data_len; 109 scp_data = ipb->fcp.scp_data; 110 break; 111 case IPL_PBT_NVME: 112 scp_data_len = ipb->nvme.scp_data_len; 113 scp_data = ipb->nvme.scp_data; 114 break; 115 case IPL_PBT_ECKD: 116 scp_data_len = ipb->eckd.scp_data_len; 117 scp_data = ipb->eckd.scp_data; 118 break; 119 120 default: 121 goto out; 122 } 123 124 count = min(size - 1, scpdata_length(scp_data, scp_data_len)); 125 if (!count) 126 goto out; 127 128 has_lowercase = 0; 129 for (i = 0; i < count; i++) { 130 if (!isascii(scp_data[i])) { 131 count = 0; 132 goto out; 133 } 134 if (!has_lowercase && islower(scp_data[i])) 135 has_lowercase = 1; 136 } 137 138 if (has_lowercase) 139 memcpy(dest, scp_data, count); 140 else 141 for (i = 0; i < count; i++) 142 dest[i] = tolower(scp_data[i]); 143 out: 144 dest[count] = '\0'; 145 return count; 146 } 147 148 static void append_ipl_block_parm(void) 149 { 150 char *parm, *delim; 151 size_t len, rc = 0; 152 153 len = strlen(early_command_line); 154 155 delim = early_command_line + len; /* '\0' character position */ 156 parm = early_command_line + len + 1; /* append right after '\0' */ 157 158 switch (ipl_block.pb0_hdr.pbt) { 159 case IPL_PBT_CCW: 160 rc = ipl_block_get_ascii_vmparm( 161 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 162 break; 163 case IPL_PBT_FCP: 164 case IPL_PBT_NVME: 165 case IPL_PBT_ECKD: 166 rc = ipl_block_get_ascii_scpdata( 167 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 168 break; 169 } 170 if (rc) { 171 if (*parm == '=') 172 memmove(early_command_line, parm + 1, rc); 173 else 174 *delim = ' '; /* replace '\0' with space */ 175 } 176 } 177 178 static inline int has_ebcdic_char(const char *str) 179 { 180 int i; 181 182 for (i = 0; str[i]; i++) 183 if (str[i] & 0x80) 184 return 1; 185 return 0; 186 } 187 188 void setup_boot_command_line(void) 189 { 190 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; 191 /* convert arch command line to ascii if necessary */ 192 if (has_ebcdic_char(parmarea.command_line)) 193 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); 194 /* copy arch command line */ 195 strcpy(early_command_line, strim(parmarea.command_line)); 196 197 /* append IPL PARM data to the boot command line */ 198 if (!is_prot_virt_guest() && ipl_block_valid) 199 append_ipl_block_parm(); 200 } 201 202 static void modify_facility(unsigned long nr, bool clear) 203 { 204 if (clear) 205 __clear_facility(nr, stfle_fac_list); 206 else 207 __set_facility(nr, stfle_fac_list); 208 } 209 210 static void check_cleared_facilities(void) 211 { 212 unsigned long als[] = { FACILITIES_ALS }; 213 int i; 214 215 for (i = 0; i < ARRAY_SIZE(als); i++) { 216 if ((stfle_fac_list[i] & als[i]) != als[i]) { 217 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); 218 print_missing_facilities(); 219 break; 220 } 221 } 222 } 223 224 static void modify_fac_list(char *str) 225 { 226 unsigned long val, endval; 227 char *endp; 228 bool clear; 229 230 while (*str) { 231 clear = false; 232 if (*str == '!') { 233 clear = true; 234 str++; 235 } 236 val = simple_strtoull(str, &endp, 0); 237 if (str == endp) 238 break; 239 str = endp; 240 if (*str == '-') { 241 str++; 242 endval = simple_strtoull(str, &endp, 0); 243 if (str == endp) 244 break; 245 str = endp; 246 while (val <= endval) { 247 modify_facility(val, clear); 248 val++; 249 } 250 } else { 251 modify_facility(val, clear); 252 } 253 if (*str != ',') 254 break; 255 str++; 256 } 257 check_cleared_facilities(); 258 } 259 260 static char command_line_buf[COMMAND_LINE_SIZE]; 261 void parse_boot_command_line(void) 262 { 263 char *param, *val; 264 bool enabled; 265 char *args; 266 int rc; 267 268 __kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); 269 args = strcpy(command_line_buf, early_command_line); 270 while (*args) { 271 args = next_arg(args, ¶m, &val); 272 273 if (!strcmp(param, "mem") && val) 274 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE); 275 276 if (!strcmp(param, "vmalloc") && val) { 277 vmalloc_size = round_up(memparse(val, NULL), _SEGMENT_SIZE); 278 vmalloc_size_set = 1; 279 } 280 281 if (!strcmp(param, "dfltcc") && val) { 282 if (!strcmp(val, "off")) 283 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED; 284 else if (!strcmp(val, "on")) 285 zlib_dfltcc_support = ZLIB_DFLTCC_FULL; 286 else if (!strcmp(val, "def_only")) 287 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY; 288 else if (!strcmp(val, "inf_only")) 289 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY; 290 else if (!strcmp(val, "always")) 291 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG; 292 } 293 294 if (!strcmp(param, "facilities") && val) 295 modify_fac_list(val); 296 297 if (!strcmp(param, "nokaslr")) 298 __kaslr_enabled = 0; 299 300 if (!strcmp(param, "cmma")) { 301 rc = kstrtobool(val, &enabled); 302 if (!rc && !enabled) 303 cmma_flag = 0; 304 } 305 306 #if IS_ENABLED(CONFIG_KVM) 307 if (!strcmp(param, "prot_virt")) { 308 rc = kstrtobool(val, &enabled); 309 if (!rc && enabled) 310 prot_virt_host = 1; 311 } 312 #endif 313 } 314 } 315