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);
18 unsigned long __bootdata(vmalloc_size) = VMALLOC_DEFAULT_SIZE;
19 unsigned long __bootdata(memory_end);
20 int __bootdata(memory_end_set);
21 int __bootdata(noexec_disabled);
23 int kaslr_enabled __section(.data);
25 static inline int __diag308(unsigned long subcode, void *addr)
27 register unsigned long _addr asm("0") = (unsigned long)addr;
28 register unsigned long _rc asm("1") = 0;
29 unsigned long reg1, reg2;
33 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
35 " st %0,0(%[psw_pgm])\n"
36 " st %1,4(%[psw_pgm])\n"
38 " stg %0,8(%[psw_pgm])\n"
39 " diag %[addr],%[subcode],0x308\n"
40 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
41 : "=&d" (reg1), "=&a" (reg2),
42 "+Q" (S390_lowcore.program_new_psw),
44 [addr] "+d" (_addr), "+d" (_rc)
45 : [subcode] "d" (subcode),
47 [psw_pgm] "a" (&S390_lowcore.program_new_psw)
52 void store_ipl_parmblock(void)
56 rc = __diag308(DIAG308_STORE, &ipl_block);
57 if (rc == DIAG308_RC_OK &&
58 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
62 static size_t scpdata_length(const u8 *buf, size_t count)
65 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
72 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
73 const struct ipl_parameter_block *ipb)
79 count = min(size - 1, scpdata_length(ipb->fcp.scp_data,
80 ipb->fcp.scp_data_len));
85 for (i = 0; i < count; i++) {
86 if (!isascii(ipb->fcp.scp_data[i])) {
90 if (!has_lowercase && islower(ipb->fcp.scp_data[i]))
95 memcpy(dest, ipb->fcp.scp_data, count);
97 for (i = 0; i < count; i++)
98 dest[i] = tolower(ipb->fcp.scp_data[i]);
104 static void append_ipl_block_parm(void)
109 len = strlen(early_command_line);
111 delim = early_command_line + len; /* '\0' character position */
112 parm = early_command_line + len + 1; /* append right after '\0' */
114 switch (ipl_block.pb0_hdr.pbt) {
116 rc = ipl_block_get_ascii_vmparm(
117 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
120 rc = ipl_block_get_ascii_scpdata(
121 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
126 memmove(early_command_line, parm + 1, rc);
128 *delim = ' '; /* replace '\0' with space */
132 static inline int has_ebcdic_char(const char *str)
136 for (i = 0; str[i]; i++)
142 void setup_boot_command_line(void)
144 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
145 /* convert arch command line to ascii if necessary */
146 if (has_ebcdic_char(COMMAND_LINE))
147 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
148 /* copy arch command line */
149 strcpy(early_command_line, strim(COMMAND_LINE));
151 /* append IPL PARM data to the boot command line */
152 if (!is_prot_virt_guest() && ipl_block_valid)
153 append_ipl_block_parm();
156 static void modify_facility(unsigned long nr, bool clear)
159 __clear_facility(nr, S390_lowcore.stfle_fac_list);
161 __set_facility(nr, S390_lowcore.stfle_fac_list);
164 static void check_cleared_facilities(void)
166 unsigned long als[] = { FACILITIES_ALS };
169 for (i = 0; i < ARRAY_SIZE(als); i++) {
170 if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) {
171 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
172 print_missing_facilities();
178 static void modify_fac_list(char *str)
180 unsigned long val, endval;
190 val = simple_strtoull(str, &endp, 0);
196 endval = simple_strtoull(str, &endp, 0);
200 while (val <= endval) {
201 modify_facility(val, clear);
205 modify_facility(val, clear);
211 check_cleared_facilities();
214 static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
215 void parse_boot_command_line(void)
222 kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE);
223 args = strcpy(command_line_buf, early_command_line);
225 args = next_arg(args, ¶m, &val);
227 if (!strcmp(param, "mem") && val) {
228 memory_end = round_down(memparse(val, NULL), PAGE_SIZE);
232 if (!strcmp(param, "vmalloc") && val)
233 vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
235 if (!strcmp(param, "noexec")) {
236 rc = kstrtobool(val, &enabled);
241 if (!strcmp(param, "facilities") && val)
242 modify_fac_list(val);
244 if (!strcmp(param, "nokaslr"))
249 void setup_memory_end(void)
251 #ifdef CONFIG_CRASH_DUMP
254 } else if (ipl_block_valid &&
255 ipl_block.pb0_hdr.pbt == IPL_PBT_FCP &&
256 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) {
258 if (!sclp_early_get_hsa_size(&memory_end) && memory_end)