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/abs_lowcore.h>
7 #include <asm/page-states.h>
8 #include <asm/machine.h>
9 #include <asm/ebcdic.h>
10 #include <asm/sclp.h>
11 #include <asm/sections.h>
12 #include <asm/boot_data.h>
13 #include <asm/facility.h>
14 #include <asm/setup.h>
15 #include <asm/uv.h>
16 #include "boot.h"
17
18 struct parmarea parmarea __section(".parmarea") = {
19 .kernel_version = (unsigned long)kernel_version,
20 .max_command_line_size = COMMAND_LINE_SIZE,
21 .command_line = "root=/dev/ram0 ro",
22 };
23
24 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
25
26 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL;
27 struct ipl_parameter_block __bootdata_preserved(ipl_block);
28 int __bootdata_preserved(ipl_block_valid);
29 int __bootdata_preserved(__kaslr_enabled);
30 int __bootdata_preserved(cmma_flag) = 1;
31
32 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE;
33 unsigned long memory_limit;
34 int vmalloc_size_set;
35
__diag308(unsigned long subcode,void * addr)36 static inline int __diag308(unsigned long subcode, void *addr)
37 {
38 union register_pair r1 = { .even = (unsigned long)addr, .odd = 0 };
39
40 asm_inline volatile(
41 " diag %[r1],%[subcode],0x308\n"
42 "0:\n"
43 EX_TABLE(0b, 0b)
44 : [r1] "+d" (r1.pair)
45 : [subcode] "d" (subcode)
46 : "cc", "memory");
47 return r1.odd;
48 }
49
store_ipl_parmblock(void)50 void store_ipl_parmblock(void)
51 {
52 int rc;
53
54 rc = __diag308(DIAG308_STORE, &ipl_block);
55 if (rc == DIAG308_RC_OK &&
56 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
57 ipl_block_valid = 1;
58 }
59
is_ipl_block_dump(void)60 bool is_ipl_block_dump(void)
61 {
62 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP &&
63 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP)
64 return true;
65 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME &&
66 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP)
67 return true;
68 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD &&
69 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP)
70 return true;
71 return false;
72 }
73
scpdata_length(const u8 * buf,size_t count)74 static size_t scpdata_length(const u8 *buf, size_t count)
75 {
76 while (count) {
77 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
78 break;
79 count--;
80 }
81 return count;
82 }
83
ipl_block_get_ascii_scpdata(char * dest,size_t size,const struct ipl_parameter_block * ipb)84 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
85 const struct ipl_parameter_block *ipb)
86 {
87 const __u8 *scp_data;
88 __u32 scp_data_len;
89 int has_lowercase;
90 size_t count = 0;
91 size_t i;
92
93 switch (ipb->pb0_hdr.pbt) {
94 case IPL_PBT_FCP:
95 scp_data_len = ipb->fcp.scp_data_len;
96 scp_data = ipb->fcp.scp_data;
97 break;
98 case IPL_PBT_NVME:
99 scp_data_len = ipb->nvme.scp_data_len;
100 scp_data = ipb->nvme.scp_data;
101 break;
102 case IPL_PBT_ECKD:
103 scp_data_len = ipb->eckd.scp_data_len;
104 scp_data = ipb->eckd.scp_data;
105 break;
106
107 default:
108 goto out;
109 }
110
111 count = min(size - 1, scpdata_length(scp_data, scp_data_len));
112 if (!count)
113 goto out;
114
115 has_lowercase = 0;
116 for (i = 0; i < count; i++) {
117 if (!isascii(scp_data[i])) {
118 count = 0;
119 goto out;
120 }
121 if (!has_lowercase && islower(scp_data[i]))
122 has_lowercase = 1;
123 }
124
125 if (has_lowercase)
126 memcpy(dest, scp_data, count);
127 else
128 for (i = 0; i < count; i++)
129 dest[i] = tolower(scp_data[i]);
130 out:
131 dest[count] = '\0';
132 return count;
133 }
134
append_ipl_block_parm(void)135 static void append_ipl_block_parm(void)
136 {
137 char *parm, *delim;
138 size_t len, rc = 0;
139
140 len = strlen(early_command_line);
141
142 delim = early_command_line + len; /* '\0' character position */
143 parm = early_command_line + len + 1; /* append right after '\0' */
144
145 switch (ipl_block.pb0_hdr.pbt) {
146 case IPL_PBT_CCW:
147 rc = ipl_block_get_ascii_vmparm(
148 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
149 break;
150 case IPL_PBT_FCP:
151 case IPL_PBT_NVME:
152 case IPL_PBT_ECKD:
153 rc = ipl_block_get_ascii_scpdata(
154 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
155 break;
156 }
157 if (rc) {
158 if (*parm == '=')
159 memmove(early_command_line, parm + 1, rc);
160 else
161 *delim = ' '; /* replace '\0' with space */
162 }
163 }
164
has_ebcdic_char(const char * str)165 static inline int has_ebcdic_char(const char *str)
166 {
167 int i;
168
169 for (i = 0; str[i]; i++)
170 if (str[i] & 0x80)
171 return 1;
172 return 0;
173 }
174
setup_boot_command_line(void)175 void setup_boot_command_line(void)
176 {
177 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0;
178 /* convert arch command line to ascii if necessary */
179 if (has_ebcdic_char(parmarea.command_line))
180 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE);
181 /* copy arch command line */
182 strcpy(early_command_line, strim(parmarea.command_line));
183
184 /* append IPL PARM data to the boot command line */
185 if (!is_prot_virt_guest() && ipl_block_valid)
186 append_ipl_block_parm();
187 }
188
modify_facility(unsigned long nr,bool clear)189 static void modify_facility(unsigned long nr, bool clear)
190 {
191 if (clear)
192 __clear_facility(nr, stfle_fac_list);
193 else
194 __set_facility(nr, stfle_fac_list);
195 }
196
check_cleared_facilities(void)197 static void check_cleared_facilities(void)
198 {
199 unsigned long als[] = { FACILITIES_ALS };
200 int i;
201
202 for (i = 0; i < ARRAY_SIZE(als); i++) {
203 if ((stfle_fac_list[i] & als[i]) != als[i]) {
204 boot_emerg("The Linux kernel requires facilities cleared via command line option\n");
205 print_missing_facilities();
206 break;
207 }
208 }
209 }
210
modify_fac_list(char * str)211 static void modify_fac_list(char *str)
212 {
213 unsigned long val, endval;
214 char *endp;
215 bool clear;
216
217 while (*str) {
218 clear = false;
219 if (*str == '!') {
220 clear = true;
221 str++;
222 }
223 val = simple_strtoull(str, &endp, 0);
224 if (str == endp)
225 break;
226 str = endp;
227 if (*str == '-') {
228 str++;
229 endval = simple_strtoull(str, &endp, 0);
230 if (str == endp)
231 break;
232 str = endp;
233 while (val <= endval) {
234 modify_facility(val, clear);
235 val++;
236 }
237 } else {
238 modify_facility(val, clear);
239 }
240 if (*str != ',')
241 break;
242 str++;
243 }
244 check_cleared_facilities();
245 }
246
247 static char command_line_buf[COMMAND_LINE_SIZE];
parse_boot_command_line(void)248 void parse_boot_command_line(void)
249 {
250 char *param, *val;
251 bool enabled;
252 char *args;
253 int rc;
254
255 __kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE);
256 args = strcpy(command_line_buf, early_command_line);
257 while (*args) {
258 args = next_arg(args, ¶m, &val);
259
260 if (!strcmp(param, "mem") && val)
261 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE);
262
263 if (!strcmp(param, "vmalloc") && val) {
264 vmalloc_size = round_up(memparse(val, NULL), _SEGMENT_SIZE);
265 vmalloc_size_set = 1;
266 }
267
268 if (!strcmp(param, "dfltcc") && val) {
269 if (!strcmp(val, "off"))
270 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED;
271 else if (!strcmp(val, "on"))
272 zlib_dfltcc_support = ZLIB_DFLTCC_FULL;
273 else if (!strcmp(val, "def_only"))
274 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY;
275 else if (!strcmp(val, "inf_only"))
276 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY;
277 else if (!strcmp(val, "always"))
278 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
279 }
280
281 if (!strcmp(param, "facilities") && val)
282 modify_fac_list(val);
283
284 if (!strcmp(param, "debug-alternative"))
285 alt_debug_setup(val);
286
287 if (!strcmp(param, "nokaslr"))
288 __kaslr_enabled = 0;
289
290 if (!strcmp(param, "cmma")) {
291 rc = kstrtobool(val, &enabled);
292 if (!rc && !enabled)
293 cmma_flag = 0;
294 }
295
296 #if IS_ENABLED(CONFIG_KVM)
297 if (!strcmp(param, "prot_virt")) {
298 rc = kstrtobool(val, &enabled);
299 if (!rc && enabled)
300 prot_virt_host = 1;
301 }
302 #endif
303 if (!strcmp(param, "relocate_lowcore") && test_facility(193))
304 set_machine_feature(MFEATURE_LOWCORE);
305 if (!strcmp(param, "earlyprintk"))
306 boot_earlyprintk = true;
307 if (!strcmp(param, "debug"))
308 boot_console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
309 if (!strcmp(param, "bootdebug")) {
310 bootdebug = true;
311 if (val)
312 strncpy(bootdebug_filter, val, sizeof(bootdebug_filter) - 1);
313 }
314 if (!strcmp(param, "quiet"))
315 boot_console_loglevel = CONSOLE_LOGLEVEL_QUIET;
316 if (!strcmp(param, "ignore_loglevel"))
317 boot_ignore_loglevel = true;
318 if (!strcmp(param, "loglevel")) {
319 boot_console_loglevel = simple_strtoull(val, NULL, 10);
320 if (boot_console_loglevel < CONSOLE_LOGLEVEL_MIN)
321 boot_console_loglevel = CONSOLE_LOGLEVEL_MIN;
322 }
323 }
324 }
325