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