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>
8 #include <asm/sections.h>
9 #include <asm/boot_data.h>
10 #include <asm/facility.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 int __bootdata(noexec_disabled);
22 unsigned long memory_limit;
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 bool is_ipl_block_dump(void)
62 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP &&
63 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP)
65 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME &&
66 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP)
71 static size_t scpdata_length(const u8 *buf, size_t count)
74 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
81 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
82 const struct ipl_parameter_block *ipb)
90 switch (ipb->pb0_hdr.pbt) {
92 scp_data_len = ipb->fcp.scp_data_len;
93 scp_data = ipb->fcp.scp_data;
96 scp_data_len = ipb->nvme.scp_data_len;
97 scp_data = ipb->nvme.scp_data;
103 count = min(size - 1, scpdata_length(scp_data, scp_data_len));
108 for (i = 0; i < count; i++) {
109 if (!isascii(scp_data[i])) {
113 if (!has_lowercase && islower(scp_data[i]))
118 memcpy(dest, scp_data, count);
120 for (i = 0; i < count; i++)
121 dest[i] = tolower(scp_data[i]);
127 static void append_ipl_block_parm(void)
132 len = strlen(early_command_line);
134 delim = early_command_line + len; /* '\0' character position */
135 parm = early_command_line + len + 1; /* append right after '\0' */
137 switch (ipl_block.pb0_hdr.pbt) {
139 rc = ipl_block_get_ascii_vmparm(
140 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
144 rc = ipl_block_get_ascii_scpdata(
145 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
150 memmove(early_command_line, parm + 1, rc);
152 *delim = ' '; /* replace '\0' with space */
156 static inline int has_ebcdic_char(const char *str)
160 for (i = 0; str[i]; i++)
166 void setup_boot_command_line(void)
168 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
169 /* convert arch command line to ascii if necessary */
170 if (has_ebcdic_char(COMMAND_LINE))
171 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
172 /* copy arch command line */
173 strcpy(early_command_line, strim(COMMAND_LINE));
175 /* append IPL PARM data to the boot command line */
176 if (!is_prot_virt_guest() && ipl_block_valid)
177 append_ipl_block_parm();
180 static void modify_facility(unsigned long nr, bool clear)
183 __clear_facility(nr, S390_lowcore.stfle_fac_list);
185 __set_facility(nr, S390_lowcore.stfle_fac_list);
188 static void check_cleared_facilities(void)
190 unsigned long als[] = { FACILITIES_ALS };
193 for (i = 0; i < ARRAY_SIZE(als); i++) {
194 if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) {
195 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
196 print_missing_facilities();
202 static void modify_fac_list(char *str)
204 unsigned long val, endval;
214 val = simple_strtoull(str, &endp, 0);
220 endval = simple_strtoull(str, &endp, 0);
224 while (val <= endval) {
225 modify_facility(val, clear);
229 modify_facility(val, clear);
235 check_cleared_facilities();
238 static char command_line_buf[COMMAND_LINE_SIZE];
239 void parse_boot_command_line(void)
246 kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE);
247 args = strcpy(command_line_buf, early_command_line);
249 args = next_arg(args, ¶m, &val);
251 if (!strcmp(param, "mem") && val)
252 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE);
254 if (!strcmp(param, "vmalloc") && val) {
255 vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
256 vmalloc_size_set = 1;
259 if (!strcmp(param, "dfltcc") && val) {
260 if (!strcmp(val, "off"))
261 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED;
262 else if (!strcmp(val, "on"))
263 zlib_dfltcc_support = ZLIB_DFLTCC_FULL;
264 else if (!strcmp(val, "def_only"))
265 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY;
266 else if (!strcmp(val, "inf_only"))
267 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY;
268 else if (!strcmp(val, "always"))
269 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
272 if (!strcmp(param, "noexec")) {
273 rc = kstrtobool(val, &enabled);
278 if (!strcmp(param, "facilities") && val)
279 modify_fac_list(val);
281 if (!strcmp(param, "nokaslr"))
284 #if IS_ENABLED(CONFIG_KVM)
285 if (!strcmp(param, "prot_virt")) {
286 rc = kstrtobool(val, &enabled);