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/abs_lowcore.h> 7 #include <asm/page-states.h> 8 #include <asm/ebcdic.h> 9 #include <asm/sclp.h> 10 #include <asm/sections.h> 11 #include <asm/boot_data.h> 12 #include <asm/facility.h> 13 #include <asm/setup.h> 14 #include <asm/uv.h> 15 #include "boot.h" 16 17 struct parmarea parmarea __section(".parmarea") = { 18 .kernel_version = (unsigned long)kernel_version, 19 .max_command_line_size = COMMAND_LINE_SIZE, 20 .command_line = "root=/dev/ram0 ro", 21 }; 22 23 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 24 25 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL; 26 struct ipl_parameter_block __bootdata_preserved(ipl_block); 27 int __bootdata_preserved(ipl_block_valid); 28 int __bootdata_preserved(__kaslr_enabled); 29 int __bootdata_preserved(cmma_flag) = 1; 30 31 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE; 32 unsigned long memory_limit; 33 int vmalloc_size_set; 34 35 static inline int __diag308(unsigned long subcode, void *addr) 36 { 37 unsigned long reg1, reg2; 38 union register_pair r1; 39 psw_t old; 40 41 r1.even = (unsigned long) addr; 42 r1.odd = 0; 43 asm volatile( 44 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n" 45 " epsw %[reg1],%[reg2]\n" 46 " st %[reg1],0(%[psw_pgm])\n" 47 " st %[reg2],4(%[psw_pgm])\n" 48 " larl %[reg1],1f\n" 49 " stg %[reg1],8(%[psw_pgm])\n" 50 " diag %[r1],%[subcode],0x308\n" 51 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n" 52 : [r1] "+&d" (r1.pair), 53 [reg1] "=&d" (reg1), 54 [reg2] "=&a" (reg2), 55 "+Q" (get_lowcore()->program_new_psw), 56 "=Q" (old) 57 : [subcode] "d" (subcode), 58 [psw_old] "a" (&old), 59 [psw_pgm] "a" (&get_lowcore()->program_new_psw) 60 : "cc", "memory"); 61 return r1.odd; 62 } 63 64 void store_ipl_parmblock(void) 65 { 66 int rc; 67 68 rc = __diag308(DIAG308_STORE, &ipl_block); 69 if (rc == DIAG308_RC_OK && 70 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) 71 ipl_block_valid = 1; 72 } 73 74 bool is_ipl_block_dump(void) 75 { 76 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && 77 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) 78 return true; 79 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME && 80 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP) 81 return true; 82 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD && 83 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP) 84 return true; 85 return false; 86 } 87 88 static size_t scpdata_length(const u8 *buf, size_t count) 89 { 90 while (count) { 91 if (buf[count - 1] != '\0' && buf[count - 1] != ' ') 92 break; 93 count--; 94 } 95 return count; 96 } 97 98 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, 99 const struct ipl_parameter_block *ipb) 100 { 101 const __u8 *scp_data; 102 __u32 scp_data_len; 103 int has_lowercase; 104 size_t count = 0; 105 size_t i; 106 107 switch (ipb->pb0_hdr.pbt) { 108 case IPL_PBT_FCP: 109 scp_data_len = ipb->fcp.scp_data_len; 110 scp_data = ipb->fcp.scp_data; 111 break; 112 case IPL_PBT_NVME: 113 scp_data_len = ipb->nvme.scp_data_len; 114 scp_data = ipb->nvme.scp_data; 115 break; 116 case IPL_PBT_ECKD: 117 scp_data_len = ipb->eckd.scp_data_len; 118 scp_data = ipb->eckd.scp_data; 119 break; 120 121 default: 122 goto out; 123 } 124 125 count = min(size - 1, scpdata_length(scp_data, scp_data_len)); 126 if (!count) 127 goto out; 128 129 has_lowercase = 0; 130 for (i = 0; i < count; i++) { 131 if (!isascii(scp_data[i])) { 132 count = 0; 133 goto out; 134 } 135 if (!has_lowercase && islower(scp_data[i])) 136 has_lowercase = 1; 137 } 138 139 if (has_lowercase) 140 memcpy(dest, scp_data, count); 141 else 142 for (i = 0; i < count; i++) 143 dest[i] = tolower(scp_data[i]); 144 out: 145 dest[count] = '\0'; 146 return count; 147 } 148 149 static void append_ipl_block_parm(void) 150 { 151 char *parm, *delim; 152 size_t len, rc = 0; 153 154 len = strlen(early_command_line); 155 156 delim = early_command_line + len; /* '\0' character position */ 157 parm = early_command_line + len + 1; /* append right after '\0' */ 158 159 switch (ipl_block.pb0_hdr.pbt) { 160 case IPL_PBT_CCW: 161 rc = ipl_block_get_ascii_vmparm( 162 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 163 break; 164 case IPL_PBT_FCP: 165 case IPL_PBT_NVME: 166 case IPL_PBT_ECKD: 167 rc = ipl_block_get_ascii_scpdata( 168 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 169 break; 170 } 171 if (rc) { 172 if (*parm == '=') 173 memmove(early_command_line, parm + 1, rc); 174 else 175 *delim = ' '; /* replace '\0' with space */ 176 } 177 } 178 179 static inline int has_ebcdic_char(const char *str) 180 { 181 int i; 182 183 for (i = 0; str[i]; i++) 184 if (str[i] & 0x80) 185 return 1; 186 return 0; 187 } 188 189 void setup_boot_command_line(void) 190 { 191 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; 192 /* convert arch command line to ascii if necessary */ 193 if (has_ebcdic_char(parmarea.command_line)) 194 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); 195 /* copy arch command line */ 196 strcpy(early_command_line, strim(parmarea.command_line)); 197 198 /* append IPL PARM data to the boot command line */ 199 if (!is_prot_virt_guest() && ipl_block_valid) 200 append_ipl_block_parm(); 201 } 202 203 static void modify_facility(unsigned long nr, bool clear) 204 { 205 if (clear) 206 __clear_facility(nr, stfle_fac_list); 207 else 208 __set_facility(nr, stfle_fac_list); 209 } 210 211 static void check_cleared_facilities(void) 212 { 213 unsigned long als[] = { FACILITIES_ALS }; 214 int i; 215 216 for (i = 0; i < ARRAY_SIZE(als); i++) { 217 if ((stfle_fac_list[i] & als[i]) != als[i]) { 218 boot_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); 219 print_missing_facilities(); 220 break; 221 } 222 } 223 } 224 225 static void modify_fac_list(char *str) 226 { 227 unsigned long val, endval; 228 char *endp; 229 bool clear; 230 231 while (*str) { 232 clear = false; 233 if (*str == '!') { 234 clear = true; 235 str++; 236 } 237 val = simple_strtoull(str, &endp, 0); 238 if (str == endp) 239 break; 240 str = endp; 241 if (*str == '-') { 242 str++; 243 endval = simple_strtoull(str, &endp, 0); 244 if (str == endp) 245 break; 246 str = endp; 247 while (val <= endval) { 248 modify_facility(val, clear); 249 val++; 250 } 251 } else { 252 modify_facility(val, clear); 253 } 254 if (*str != ',') 255 break; 256 str++; 257 } 258 check_cleared_facilities(); 259 } 260 261 static char command_line_buf[COMMAND_LINE_SIZE]; 262 void parse_boot_command_line(void) 263 { 264 char *param, *val; 265 bool enabled; 266 char *args; 267 int rc; 268 269 __kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); 270 args = strcpy(command_line_buf, early_command_line); 271 while (*args) { 272 args = next_arg(args, ¶m, &val); 273 274 if (!strcmp(param, "mem") && val) 275 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE); 276 277 if (!strcmp(param, "vmalloc") && val) { 278 vmalloc_size = round_up(memparse(val, NULL), _SEGMENT_SIZE); 279 vmalloc_size_set = 1; 280 } 281 282 if (!strcmp(param, "dfltcc") && val) { 283 if (!strcmp(val, "off")) 284 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED; 285 else if (!strcmp(val, "on")) 286 zlib_dfltcc_support = ZLIB_DFLTCC_FULL; 287 else if (!strcmp(val, "def_only")) 288 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY; 289 else if (!strcmp(val, "inf_only")) 290 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY; 291 else if (!strcmp(val, "always")) 292 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG; 293 } 294 295 if (!strcmp(param, "facilities") && val) 296 modify_fac_list(val); 297 298 if (!strcmp(param, "nokaslr")) 299 __kaslr_enabled = 0; 300 301 if (!strcmp(param, "cmma")) { 302 rc = kstrtobool(val, &enabled); 303 if (!rc && !enabled) 304 cmma_flag = 0; 305 } 306 307 #if IS_ENABLED(CONFIG_KVM) 308 if (!strcmp(param, "prot_virt")) { 309 rc = kstrtobool(val, &enabled); 310 if (!rc && enabled) 311 prot_virt_host = 1; 312 } 313 #endif 314 if (!strcmp(param, "relocate_lowcore") && test_facility(193)) 315 relocate_lowcore = 1; 316 } 317 } 318