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/ebcdic.h>
9 #include <asm/sclp.h>
10 #include <asm/sections.h>
11 #include <asm/boot_data.h>
12 #include <asm/facility.h>
13 #include <asm/setup.h>
14 #include <asm/uv.h>
15 #include "boot.h"
16
17 struct parmarea parmarea __section(".parmarea") = {
18 .kernel_version = (unsigned long)kernel_version,
19 .max_command_line_size = COMMAND_LINE_SIZE,
20 .command_line = "root=/dev/ram0 ro",
21 };
22
23 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
24
25 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL;
26 struct ipl_parameter_block __bootdata_preserved(ipl_block);
27 int __bootdata_preserved(ipl_block_valid);
28 int __bootdata_preserved(__kaslr_enabled);
29 int __bootdata_preserved(cmma_flag) = 1;
30
31 unsigned long vmalloc_size = VMALLOC_DEFAULT_SIZE;
32 unsigned long memory_limit;
33 int vmalloc_size_set;
34
35 static inline int __diag308(unsigned long subcode, void *addr)
36 {
37 unsigned long reg1, reg2;
38 union register_pair r1;
39 psw_t old;
40
41 r1.even = (unsigned long) addr;
42 r1.odd = 0;
43 asm volatile(
44 " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
45 " epsw %[reg1],%[reg2]\n"
46 " st %[reg1],0(%[psw_pgm])\n"
47 " st %[reg2],4(%[psw_pgm])\n"
48 " larl %[reg1],1f\n"
49 " stg %[reg1],8(%[psw_pgm])\n"
50 " diag %[r1],%[subcode],0x308\n"
51 "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
52 : [r1] "+&d" (r1.pair),
53 [reg1] "=&d" (reg1),
54 [reg2] "=&a" (reg2),
55 "+Q" (get_lowcore()->program_new_psw),
56 "=Q" (old)
57 : [subcode] "d" (subcode),
58 [psw_old] "a" (&old),
59 [psw_pgm] "a" (&get_lowcore()->program_new_psw)
60 : "cc", "memory");
61 return r1.odd;
62 }
63
64 void store_ipl_parmblock(void)
65 {
66 int rc;
67
68 rc = __diag308(DIAG308_STORE, &ipl_block);
69 if (rc == DIAG308_RC_OK &&
70 ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
71 ipl_block_valid = 1;
72 }
73
74 bool is_ipl_block_dump(void)
75 {
76 if (ipl_block.pb0_hdr.pbt == IPL_PBT_FCP &&
77 ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP)
78 return true;
79 if (ipl_block.pb0_hdr.pbt == IPL_PBT_NVME &&
80 ipl_block.nvme.opt == IPL_PB0_NVME_OPT_DUMP)
81 return true;
82 if (ipl_block.pb0_hdr.pbt == IPL_PBT_ECKD &&
83 ipl_block.eckd.opt == IPL_PB0_ECKD_OPT_DUMP)
84 return true;
85 return false;
86 }
87
88 static size_t scpdata_length(const u8 *buf, size_t count)
89 {
90 while (count) {
91 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
92 break;
93 count--;
94 }
95 return count;
96 }
97
98 static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
99 const struct ipl_parameter_block *ipb)
100 {
101 const __u8 *scp_data;
102 __u32 scp_data_len;
103 int has_lowercase;
104 size_t count = 0;
105 size_t i;
106
107 switch (ipb->pb0_hdr.pbt) {
108 case IPL_PBT_FCP:
109 scp_data_len = ipb->fcp.scp_data_len;
110 scp_data = ipb->fcp.scp_data;
111 break;
112 case IPL_PBT_NVME:
113 scp_data_len = ipb->nvme.scp_data_len;
114 scp_data = ipb->nvme.scp_data;
115 break;
116 case IPL_PBT_ECKD:
117 scp_data_len = ipb->eckd.scp_data_len;
118 scp_data = ipb->eckd.scp_data;
119 break;
120
121 default:
122 goto out;
123 }
124
125 count = min(size - 1, scpdata_length(scp_data, scp_data_len));
126 if (!count)
127 goto out;
128
129 has_lowercase = 0;
130 for (i = 0; i < count; i++) {
131 if (!isascii(scp_data[i])) {
132 count = 0;
133 goto out;
134 }
135 if (!has_lowercase && islower(scp_data[i]))
136 has_lowercase = 1;
137 }
138
139 if (has_lowercase)
140 memcpy(dest, scp_data, count);
141 else
142 for (i = 0; i < count; i++)
143 dest[i] = tolower(scp_data[i]);
144 out:
145 dest[count] = '\0';
146 return count;
147 }
148
149 static void append_ipl_block_parm(void)
150 {
151 char *parm, *delim;
152 size_t len, rc = 0;
153
154 len = strlen(early_command_line);
155
156 delim = early_command_line + len; /* '\0' character position */
157 parm = early_command_line + len + 1; /* append right after '\0' */
158
159 switch (ipl_block.pb0_hdr.pbt) {
160 case IPL_PBT_CCW:
161 rc = ipl_block_get_ascii_vmparm(
162 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
163 break;
164 case IPL_PBT_FCP:
165 case IPL_PBT_NVME:
166 case IPL_PBT_ECKD:
167 rc = ipl_block_get_ascii_scpdata(
168 parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
169 break;
170 }
171 if (rc) {
172 if (*parm == '=')
173 memmove(early_command_line, parm + 1, rc);
174 else
175 *delim = ' '; /* replace '\0' with space */
176 }
177 }
178
179 static inline int has_ebcdic_char(const char *str)
180 {
181 int i;
182
183 for (i = 0; str[i]; i++)
184 if (str[i] & 0x80)
185 return 1;
186 return 0;
187 }
188
189 void setup_boot_command_line(void)
190 {
191 parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0;
192 /* convert arch command line to ascii if necessary */
193 if (has_ebcdic_char(parmarea.command_line))
194 EBCASC(parmarea.command_line, COMMAND_LINE_SIZE);
195 /* copy arch command line */
196 strcpy(early_command_line, strim(parmarea.command_line));
197
198 /* append IPL PARM data to the boot command line */
199 if (!is_prot_virt_guest() && ipl_block_valid)
200 append_ipl_block_parm();
201 }
202
203 static void modify_facility(unsigned long nr, bool clear)
204 {
205 if (clear)
206 __clear_facility(nr, stfle_fac_list);
207 else
208 __set_facility(nr, stfle_fac_list);
209 }
210
211 static void check_cleared_facilities(void)
212 {
213 unsigned long als[] = { FACILITIES_ALS };
214 int i;
215
216 for (i = 0; i < ARRAY_SIZE(als); i++) {
217 if ((stfle_fac_list[i] & als[i]) != als[i]) {
218 sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
219 print_missing_facilities();
220 break;
221 }
222 }
223 }
224
225 static void modify_fac_list(char *str)
226 {
227 unsigned long val, endval;
228 char *endp;
229 bool clear;
230
231 while (*str) {
232 clear = false;
233 if (*str == '!') {
234 clear = true;
235 str++;
236 }
237 val = simple_strtoull(str, &endp, 0);
238 if (str == endp)
239 break;
240 str = endp;
241 if (*str == '-') {
242 str++;
243 endval = simple_strtoull(str, &endp, 0);
244 if (str == endp)
245 break;
246 str = endp;
247 while (val <= endval) {
248 modify_facility(val, clear);
249 val++;
250 }
251 } else {
252 modify_facility(val, clear);
253 }
254 if (*str != ',')
255 break;
256 str++;
257 }
258 check_cleared_facilities();
259 }
260
261 static char command_line_buf[COMMAND_LINE_SIZE];
262 void parse_boot_command_line(void)
263 {
264 char *param, *val;
265 bool enabled;
266 char *args;
267 int rc;
268
269 __kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE);
270 args = strcpy(command_line_buf, early_command_line);
271 while (*args) {
272 args = next_arg(args, ¶m, &val);
273
274 if (!strcmp(param, "mem") && val)
275 memory_limit = round_down(memparse(val, NULL), PAGE_SIZE);
276
277 if (!strcmp(param, "vmalloc") && val) {
278 vmalloc_size = round_up(memparse(val, NULL), _SEGMENT_SIZE);
279 vmalloc_size_set = 1;
280 }
281
282 if (!strcmp(param, "dfltcc") && val) {
283 if (!strcmp(val, "off"))
284 zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED;
285 else if (!strcmp(val, "on"))
286 zlib_dfltcc_support = ZLIB_DFLTCC_FULL;
287 else if (!strcmp(val, "def_only"))
288 zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY;
289 else if (!strcmp(val, "inf_only"))
290 zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY;
291 else if (!strcmp(val, "always"))
292 zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
293 }
294
295 if (!strcmp(param, "facilities") && val)
296 modify_fac_list(val);
297
298 if (!strcmp(param, "nokaslr"))
299 __kaslr_enabled = 0;
300
301 if (!strcmp(param, "cmma")) {
302 rc = kstrtobool(val, &enabled);
303 if (!rc && !enabled)
304 cmma_flag = 0;
305 }
306
307 #if IS_ENABLED(CONFIG_KVM)
308 if (!strcmp(param, "prot_virt")) {
309 rc = kstrtobool(val, &enabled);
310 if (!rc && enabled)
311 prot_virt_host = 1;
312 }
313 #endif
314 if (!strcmp(param, "relocate_lowcore") && test_facility(193))
315 relocate_lowcore = 1;
316 }
317 }
318
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