1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/ctype.h>
5 #include <asm/ebcdic.h>
7 #include <asm/sections.h>
8 #include <asm/boot_data.h>
9 #include <asm/facility.h>
10 #include <asm/pgtable.h>
14 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
15 struct ipl_parameter_block __bootdata_preserved(ipl_block);
16 int __bootdata_preserved(ipl_block_valid);
17 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL;
19 unsigned long __bootdata(vmalloc_size) = VMALLOC_DEFAULT_SIZE;
20 unsigned long __bootdata(memory_end);
21 int __bootdata(memory_end_set);
22 int __bootdata(noexec_disabled);
24 int kaslr_enabled __section(.data);
26 static inline int __diag308(unsigned long subcode, void *addr)
28 register unsigned long _addr asm("0") = (unsigned long)addr;
29 register unsigned long _rc asm("1") = 0;
30 unsigned long reg1, reg2;
31 psw_t old = S390_lowcore.program_new_psw;
36 " st %1,%[psw_pgm]+4\n"
38 " stg %0,%[psw_pgm]+8\n"
39 " diag %[addr],%[subcode],0x308\n"
41 : "=&d" (reg1), "=&a" (reg2),
42 [psw_pgm] "=Q" (S390_lowcore.program_new_psw),
43 [addr] "+d" (_addr), "+d" (_rc)
44 : [subcode] "d" (subcode)
46 S390_lowcore.program_new_psw = old;
50 void store_ipl_parmblock(void)
54 rc = __diag308(DIAG308_STORE, &ipl_block);
55 if (rc == DIAG308_RC_OK &&
56 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
60 static size_t scpdata_length(const u8 *buf, size_t count)
63 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
70 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
71 const struct ipl_parameter_block *ipb)
77 count = min(size - 1, scpdata_length(ipb->fcp.scp_data,
78 ipb->fcp.scp_data_len));
83 for (i = 0; i < count; i++) {
84 if (!isascii(ipb->fcp.scp_data[i])) {
88 if (!has_lowercase && islower(ipb->fcp.scp_data[i]))
93 memcpy(dest, ipb->fcp.scp_data, count);
95 for (i = 0; i < count; i++)
96 dest[i] = tolower(ipb->fcp.scp_data[i]);
102 static void append_ipl_block_parm(void)
107 len = strlen(early_command_line);
109 delim = early_command_line + len; /* '\0' character position */
110 parm = early_command_line + len + 1; /* append right after '\0' */
112 switch (ipl_block.pb0_hdr.pbt) {
114 rc = ipl_block_get_ascii_vmparm(
115 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
118 rc = ipl_block_get_ascii_scpdata(
119 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
124 memmove(early_command_line, parm + 1, rc);
126 *delim = ' '; /* replace '\0' with space */
130 static inline int has_ebcdic_char(const char *str)
134 for (i = 0; str[i]; i++)
140 void setup_boot_command_line(void)
142 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
143 /* convert arch command line to ascii if necessary */
144 if (has_ebcdic_char(COMMAND_LINE))
145 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
146 /* copy arch command line */
147 strcpy(early_command_line, strim(COMMAND_LINE));
149 /* append IPL PARM data to the boot command line */
150 if (!is_prot_virt_guest() && ipl_block_valid)
151 append_ipl_block_parm();
154 static void modify_facility(unsigned long nr, bool clear)
157 __clear_facility(nr, S390_lowcore.stfle_fac_list);
159 __set_facility(nr, S390_lowcore.stfle_fac_list);
162 static void check_cleared_facilities(void)
164 unsigned long als[] = { FACILITIES_ALS };
167 for (i = 0; i < ARRAY_SIZE(als); i++) {
168 if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) {
169 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
170 print_missing_facilities();
176 static void modify_fac_list(char *str)
178 unsigned long val, endval;
188 val = simple_strtoull(str, &endp, 0);
194 endval = simple_strtoull(str, &endp, 0);
198 while (val <= endval) {
199 modify_facility(val, clear);
203 modify_facility(val, clear);
209 check_cleared_facilities();
212 static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
213 void parse_boot_command_line(void)
220 kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE);
221 args = strcpy(command_line_buf, early_command_line);
223 args = next_arg(args, ¶m, &val);
225 if (!strcmp(param, "mem") && val) {
226 memory_end = round_down(memparse(val, NULL), PAGE_SIZE);
230 if (!strcmp(param, "vmalloc") && val)
231 vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
233 if (!strcmp(param, "dfltcc")) {
234 if (!strcmp(val, "off"))
235 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED;
236 else if (!strcmp(val, "on"))
237 zlib_dfltcc_support = ZLIB_DFLTCC_FULL;
238 else if (!strcmp(val, "def_only"))
239 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY;
240 else if (!strcmp(val, "inf_only"))
241 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY;
242 else if (!strcmp(val, "always"))
243 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
246 if (!strcmp(param, "noexec")) {
247 rc = kstrtobool(val, &enabled);
252 if (!strcmp(param, "facilities") && val)
253 modify_fac_list(val);
255 if (!strcmp(param, "nokaslr"))
260 void setup_memory_end(void)
262 #ifdef CONFIG_CRASH_DUMP
265 } else if (ipl_block_valid &&
266 ipl_block.pb0_hdr.pbt == IPL_PBT_FCP &&
267 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) {
269 if (!sclp_early_get_hsa_size(&memory_end) && memory_end)