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/uv.h> 12 #include "boot.h" 13 14 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 15 int __bootdata(noexec_disabled); 16 17 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL; 18 struct ipl_parameter_block __bootdata_preserved(ipl_block); 19 int __bootdata_preserved(ipl_block_valid); 20 21 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE; 22 unsigned long memory_limit; 23 int vmalloc_size_set; 24 int kaslr_enabled; 25 26 static inline int __diag308(unsigned long subcode, void *addr) 27 { 28 unsigned long reg1, reg2; 29 union register_pair r1; 30 psw_t old; 31 32 r1.even = (unsigned long) addr; 33 r1.odd = 0; 34 asm volatile( 35 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n" 36 " epsw %[reg1],%[reg2]\n" 37 " st %[reg1],0(%[psw_pgm])\n" 38 " st %[reg2],4(%[psw_pgm])\n" 39 " larl %[reg1],1f\n" 40 " stg %[reg1],8(%[psw_pgm])\n" 41 " diag %[r1],%[subcode],0x308\n" 42 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n" 43 : [r1] "+&d" (r1.pair), 44 [reg1] "=&d" (reg1), 45 [reg2] "=&a" (reg2), 46 "+Q" (S390_lowcore.program_new_psw), 47 "=Q" (old) 48 : [subcode] "d" (subcode), 49 [psw_old] "a" (&old), 50 [psw_pgm] "a" (&S390_lowcore.program_new_psw) 51 : "cc", "memory"); 52 return r1.odd; 53 } 54 55 void store_ipl_parmblock(void) 56 { 57 int rc; 58 59 rc = __diag308(DIAG308_STORE, &ipl_block); 60 if (rc == DIAG308_RC_OK && 61 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) 62 ipl_block_valid = 1; 63 } 64 65 bool is_ipl_block_dump(void) 66 { 67 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && 68 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) 69 return true; 70 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME && 71 ipl_block.nvme.opt == IPL_PB0_NVME_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 default: 105 goto out; 106 } 107 108 count = min(size - 1, scpdata_length(scp_data, scp_data_len)); 109 if (!count) 110 goto out; 111 112 has_lowercase = 0; 113 for (i = 0; i < count; i++) { 114 if (!isascii(scp_data[i])) { 115 count = 0; 116 goto out; 117 } 118 if (!has_lowercase && islower(scp_data[i])) 119 has_lowercase = 1; 120 } 121 122 if (has_lowercase) 123 memcpy(dest, scp_data, count); 124 else 125 for (i = 0; i < count; i++) 126 dest[i] = tolower(scp_data[i]); 127 out: 128 dest[count] = '\0'; 129 return count; 130 } 131 132 static void append_ipl_block_parm(void) 133 { 134 char *parm, *delim; 135 size_t len, rc = 0; 136 137 len = strlen(early_command_line); 138 139 delim = early_command_line + len; /* '\0' character position */ 140 parm = early_command_line + len + 1; /* append right after '\0' */ 141 142 switch (ipl_block.pb0_hdr.pbt) { 143 case IPL_PBT_CCW: 144 rc = ipl_block_get_ascii_vmparm( 145 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 146 break; 147 case IPL_PBT_FCP: 148 case IPL_PBT_NVME: 149 rc = ipl_block_get_ascii_scpdata( 150 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); 151 break; 152 } 153 if (rc) { 154 if (*parm == '=') 155 memmove(early_command_line, parm + 1, rc); 156 else 157 *delim = ' '; /* replace '\0' with space */ 158 } 159 } 160 161 static inline int has_ebcdic_char(const char *str) 162 { 163 int i; 164 165 for (i = 0; str[i]; i++) 166 if (str[i] & 0x80) 167 return 1; 168 return 0; 169 } 170 171 void setup_boot_command_line(void) 172 { 173 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; 174 /* convert arch command line to ascii if necessary */ 175 if (has_ebcdic_char(parmarea.command_line)) 176 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); 177 /* copy arch command line */ 178 strcpy(early_command_line, strim(parmarea.command_line)); 179 180 /* append IPL PARM data to the boot command line */ 181 if (!is_prot_virt_guest() && ipl_block_valid) 182 append_ipl_block_parm(); 183 } 184 185 static void modify_facility(unsigned long nr, bool clear) 186 { 187 if (clear) 188 __clear_facility(nr, stfle_fac_list); 189 else 190 __set_facility(nr, stfle_fac_list); 191 } 192 193 static void check_cleared_facilities(void) 194 { 195 unsigned long als[] = { FACILITIES_ALS }; 196 int i; 197 198 for (i = 0; i < ARRAY_SIZE(als); i++) { 199 if ((stfle_fac_list[i] & als[i]) != als[i]) { 200 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); 201 print_missing_facilities(); 202 break; 203 } 204 } 205 } 206 207 static void modify_fac_list(char *str) 208 { 209 unsigned long val, endval; 210 char *endp; 211 bool clear; 212 213 while (*str) { 214 clear = false; 215 if (*str == '!') { 216 clear = true; 217 str++; 218 } 219 val = simple_strtoull(str, &endp, 0); 220 if (str == endp) 221 break; 222 str = endp; 223 if (*str == '-') { 224 str++; 225 endval = simple_strtoull(str, &endp, 0); 226 if (str == endp) 227 break; 228 str = endp; 229 while (val <= endval) { 230 modify_facility(val, clear); 231 val++; 232 } 233 } else { 234 modify_facility(val, clear); 235 } 236 if (*str != ',') 237 break; 238 str++; 239 } 240 check_cleared_facilities(); 241 } 242 243 static char command_line_buf[COMMAND_LINE_SIZE]; 244 void parse_boot_command_line(void) 245 { 246 char *param, *val; 247 bool enabled; 248 char *args; 249 int rc; 250 251 kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); 252 args = strcpy(command_line_buf, early_command_line); 253 while (*args) { 254 args = next_arg(args, ¶m, &val); 255 256 if (!strcmp(param, "mem") && val) 257 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE); 258 259 if (!strcmp(param, "vmalloc") && val) { 260 vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE); 261 vmalloc_size_set = 1; 262 } 263 264 if (!strcmp(param, "dfltcc") && val) { 265 if (!strcmp(val, "off")) 266 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED; 267 else if (!strcmp(val, "on")) 268 zlib_dfltcc_support = ZLIB_DFLTCC_FULL; 269 else if (!strcmp(val, "def_only")) 270 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY; 271 else if (!strcmp(val, "inf_only")) 272 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY; 273 else if (!strcmp(val, "always")) 274 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG; 275 } 276 277 if (!strcmp(param, "noexec")) { 278 rc = kstrtobool(val, &enabled); 279 if (!rc && !enabled) 280 noexec_disabled = 1; 281 } 282 283 if (!strcmp(param, "facilities") && val) 284 modify_fac_list(val); 285 286 if (!strcmp(param, "nokaslr")) 287 kaslr_enabled = 0; 288 289 #if IS_ENABLED(CONFIG_KVM) 290 if (!strcmp(param, "prot_virt")) { 291 rc = kstrtobool(val, &enabled); 292 if (!rc && enabled) 293 prot_virt_host = 1; 294 } 295 #endif 296 } 297 } 298