arch/s390/boot/ipl_parm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/init.h>
   3 #include <linux/ctype.h>
   4 #include <asm/ebcdic.h>
   5 #include <asm/sclp.h>
   6 #include <asm/sections.h>
   7 #include <asm/boot_data.h>
   8 #include <asm/facility.h>
   9 #include "boot.h"
  10
  11 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
  12 struct ipl_parameter_block __bootdata(early_ipl_block);
  13 int __bootdata(early_ipl_block_valid);
  14
  15 unsigned long __bootdata(memory_end);
  16 int __bootdata(memory_end_set);
  17 int __bootdata(noexec_disabled);
  18
  19 static inline int __diag308(unsigned long subcode, void *addr)
  20 {
  21         register unsigned long _addr asm("0") = (unsigned long)addr;
  22         register unsigned long _rc asm("1") = 0;
  23         unsigned long reg1, reg2;
  24         psw_t old = S390_lowcore.program_new_psw;
  25
  26         asm volatile(
  27                 "       epsw    %0,%1\n"
  28                 "       st      %0,%[psw_pgm]\n"
  29                 "       st      %1,%[psw_pgm]+4\n"
  30                 "       larl    %0,1f\n"
  31                 "       stg     %0,%[psw_pgm]+8\n"
  32                 "       diag    %[addr],%[subcode],0x308\n"
  33                 "1:     nopr    %%r7\n"
  34                 : "=&d" (reg1), "=&a" (reg2),
  35                   [psw_pgm] "=Q" (S390_lowcore.program_new_psw),
  36                   [addr] "+d" (_addr), "+d" (_rc)
  37                 : [subcode] "d" (subcode)
  38                 : "cc", "memory");
  39         S390_lowcore.program_new_psw = old;
  40         return _rc;
  41 }
  42
  43 void store_ipl_parmblock(void)
  44 {
  45         int rc;
  46
  47         rc = __diag308(DIAG308_STORE, &early_ipl_block);
  48         if (rc == DIAG308_RC_OK &&
  49             early_ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
  50                 early_ipl_block_valid = 1;
  51 }
  52
  53 static size_t scpdata_length(const char *buf, size_t count)
  54 {
  55         while (count) {
  56                 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
  57                         break;
  58                 count--;
  59         }
  60         return count;
  61 }
  62
  63 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
  64                                           const struct ipl_parameter_block *ipb)
  65 {
  66         size_t count;
  67         size_t i;
  68         int has_lowercase;
  69
  70         count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
  71                                              ipb->ipl_info.fcp.scp_data_len));
  72         if (!count)
  73                 goto out;
  74
  75         has_lowercase = 0;
  76         for (i = 0; i < count; i++) {
  77                 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
  78                         count = 0;
  79                         goto out;
  80                 }
  81                 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
  82                         has_lowercase = 1;
  83         }
  84
  85         if (has_lowercase)
  86                 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
  87         else
  88                 for (i = 0; i < count; i++)
  89                         dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
  90 out:
  91         dest[count] = '\0';
  92         return count;
  93 }
  94
  95 static void append_ipl_block_parm(void)
  96 {
  97         char *parm, *delim;
  98         size_t len, rc = 0;
  99
 100         len = strlen(early_command_line);
 101
 102         delim = early_command_line + len;    /* '\0' character position */
 103         parm = early_command_line + len + 1; /* append right after '\0' */
 104
 105         switch (early_ipl_block.hdr.pbt) {
 106         case DIAG308_IPL_TYPE_CCW:
 107                 rc = ipl_block_get_ascii_vmparm(
 108                         parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
 109                 break;
 110         case DIAG308_IPL_TYPE_FCP:
 111                 rc = ipl_block_get_ascii_scpdata(
 112                         parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
 113                 break;
 114         }
 115         if (rc) {
 116                 if (*parm == '=')
 117                         memmove(early_command_line, parm + 1, rc);
 118                 else
 119                         *delim = ' '; /* replace '\0' with space */
 120         }
 121 }
 122
 123 static inline int has_ebcdic_char(const char *str)
 124 {
 125         int i;
 126
 127         for (i = 0; str[i]; i++)
 128                 if (str[i] & 0x80)
 129                         return 1;
 130         return 0;
 131 }
 132
 133 void setup_boot_command_line(void)
 134 {
 135         COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
 136         /* convert arch command line to ascii if necessary */
 137         if (has_ebcdic_char(COMMAND_LINE))
 138                 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
 139         /* copy arch command line */
 140         strcpy(early_command_line, strim(COMMAND_LINE));
 141
 142         /* append IPL PARM data to the boot command line */
 143         if (early_ipl_block_valid)
 144                 append_ipl_block_parm();
 145 }
 146
 147 static void modify_facility(unsigned long nr, bool clear)
 148 {
 149         if (clear)
 150                 __clear_facility(nr, S390_lowcore.stfle_fac_list);
 151         else
 152                 __set_facility(nr, S390_lowcore.stfle_fac_list);
 153 }
 154
 155 static void modify_fac_list(char *str)
 156 {
 157         unsigned long val, endval;
 158         char *endp;
 159         bool clear;
 160
 161         while (*str) {
 162                 clear = false;
 163                 if (*str == '!') {
 164                         clear = true;
 165                         str++;
 166                 }
 167                 val = simple_strtoull(str, &endp, 0);
 168                 if (str == endp)
 169                         break;
 170                 str = endp;
 171                 if (*str == '-') {
 172                         str++;
 173                         endval = simple_strtoull(str, &endp, 0);
 174                         if (str == endp)
 175                                 break;
 176                         str = endp;
 177                         while (val <= endval) {
 178                                 modify_facility(val, clear);
 179                                 val++;
 180                         }
 181                 } else {
 182                         modify_facility(val, clear);
 183                 }
 184                 if (*str != ',')
 185                         break;
 186                 str++;
 187         }
 188 }
 189
 190 static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
 191 void parse_boot_command_line(void)
 192 {
 193         char *param, *val;
 194         bool enabled;
 195         char *args;
 196         int rc;
 197
 198         args = strcpy(command_line_buf, early_command_line);
 199         while (*args) {
 200                 args = next_arg(args, &param, &val);
 201
 202                 if (!strcmp(param, "mem")) {
 203                         memory_end = memparse(val, NULL);
 204                         memory_end_set = 1;
 205                 }
 206
 207                 if (!strcmp(param, "noexec")) {
 208                         rc = kstrtobool(val, &enabled);
 209                         if (!rc && !enabled)
 210                                 noexec_disabled = 1;
 211                 }
 212
 213                 if (!strcmp(param, "facilities"))
 214                         modify_fac_list(val);
 215         }
 216 }
 217
 218 void setup_memory_end(void)
 219 {
 220 #ifdef CONFIG_CRASH_DUMP
 221         if (!OLDMEM_BASE && early_ipl_block_valid &&
 222             early_ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP &&
 223             early_ipl_block.ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP) {
 224                 if (!sclp_early_get_hsa_size(&memory_end) && memory_end)
 225                         memory_end_set = 1;
 226         }
 227 #endif
 228 }