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ab14de6c HC |
1 | /* |
2 | * arch/s390/kernel/early.c | |
3 | * | |
4 | * Copyright IBM Corp. 2007 | |
5 | * Author(s): Hongjie Yang <hongjie@us.ibm.com>, | |
6 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/ctype.h> | |
13 | #include <linux/lockdep.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/pfn.h> | |
16 | #include <linux/uaccess.h> | |
46b05d26 | 17 | #include <asm/ipl.h> |
ab14de6c HC |
18 | #include <asm/lowcore.h> |
19 | #include <asm/processor.h> | |
20 | #include <asm/sections.h> | |
21 | #include <asm/setup.h> | |
22 | #include <asm/cpcmd.h> | |
23 | #include <asm/sclp.h> | |
24 | ||
25 | /* | |
26 | * Create a Kernel NSS if the SAVESYS= parameter is defined | |
27 | */ | |
28 | #define DEFSYS_CMD_SIZE 96 | |
29 | #define SAVESYS_CMD_SIZE 32 | |
30 | ||
ab14de6c HC |
31 | char kernel_nss_name[NSS_NAME_SIZE + 1]; |
32 | ||
33 | #ifdef CONFIG_SHARED_KERNEL | |
34 | static noinline __init void create_kernel_nss(void) | |
35 | { | |
36 | unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; | |
37 | #ifdef CONFIG_BLK_DEV_INITRD | |
38 | unsigned int sinitrd_pfn, einitrd_pfn; | |
39 | #endif | |
40 | int response; | |
41 | char *savesys_ptr; | |
42 | char upper_command_line[COMMAND_LINE_SIZE]; | |
43 | char defsys_cmd[DEFSYS_CMD_SIZE]; | |
44 | char savesys_cmd[SAVESYS_CMD_SIZE]; | |
45 | ||
46 | /* Do nothing if we are not running under VM */ | |
47 | if (!MACHINE_IS_VM) | |
48 | return; | |
49 | ||
50 | /* Convert COMMAND_LINE to upper case */ | |
51 | for (i = 0; i < strlen(COMMAND_LINE); i++) | |
52 | upper_command_line[i] = toupper(COMMAND_LINE[i]); | |
53 | ||
54 | savesys_ptr = strstr(upper_command_line, "SAVESYS="); | |
55 | ||
56 | if (!savesys_ptr) | |
57 | return; | |
58 | ||
59 | savesys_ptr += 8; /* Point to the beginning of the NSS name */ | |
60 | for (i = 0; i < NSS_NAME_SIZE; i++) { | |
61 | if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') | |
62 | break; | |
63 | kernel_nss_name[i] = savesys_ptr[i]; | |
64 | } | |
65 | ||
66 | stext_pfn = PFN_DOWN(__pa(&_stext)); | |
67 | eshared_pfn = PFN_DOWN(__pa(&_eshared)); | |
68 | end_pfn = PFN_UP(__pa(&_end)); | |
69 | min_size = end_pfn << 2; | |
70 | ||
71 | sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", | |
72 | kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, | |
73 | eshared_pfn, end_pfn); | |
74 | ||
75 | #ifdef CONFIG_BLK_DEV_INITRD | |
76 | if (INITRD_START && INITRD_SIZE) { | |
77 | sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); | |
78 | einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); | |
79 | min_size = einitrd_pfn << 2; | |
80 | sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, | |
81 | sinitrd_pfn, einitrd_pfn); | |
82 | } | |
83 | #endif | |
84 | ||
85 | sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size); | |
86 | sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", | |
87 | kernel_nss_name, kernel_nss_name); | |
88 | ||
89 | __cpcmd(defsys_cmd, NULL, 0, &response); | |
90 | ||
91 | if (response != 0) | |
92 | return; | |
93 | ||
94 | __cpcmd(savesys_cmd, NULL, 0, &response); | |
95 | ||
96 | if (response != strlen(savesys_cmd)) | |
97 | return; | |
98 | ||
99 | ipl_flags = IPL_NSS_VALID; | |
100 | } | |
101 | ||
102 | #else /* CONFIG_SHARED_KERNEL */ | |
103 | ||
104 | static inline void create_kernel_nss(void) { } | |
105 | ||
106 | #endif /* CONFIG_SHARED_KERNEL */ | |
107 | ||
108 | /* | |
109 | * Clear bss memory | |
110 | */ | |
111 | static noinline __init void clear_bss_section(void) | |
112 | { | |
229d9c6d | 113 | memset(__bss_start, 0, __bss_stop - __bss_start); |
ab14de6c HC |
114 | } |
115 | ||
116 | /* | |
117 | * Initialize storage key for kernel pages | |
118 | */ | |
119 | static noinline __init void init_kernel_storage_key(void) | |
120 | { | |
121 | unsigned long end_pfn, init_pfn; | |
122 | ||
123 | end_pfn = PFN_UP(__pa(&_end)); | |
124 | ||
125 | for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) | |
126 | page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); | |
127 | } | |
128 | ||
129 | static noinline __init void detect_machine_type(void) | |
130 | { | |
131 | struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; | |
132 | ||
72960a02 | 133 | get_cpu_id(&S390_lowcore.cpu_data.cpu_id); |
ab14de6c HC |
134 | |
135 | /* Running under z/VM ? */ | |
136 | if (cpuinfo->cpu_id.version == 0xff) | |
137 | machine_flags |= 1; | |
138 | ||
139 | /* Running on a P/390 ? */ | |
140 | if (cpuinfo->cpu_id.machine == 0x7490) | |
141 | machine_flags |= 4; | |
142 | } | |
143 | ||
257c6e1c | 144 | #ifdef CONFIG_64BIT |
ab14de6c HC |
145 | static noinline __init int memory_fast_detect(void) |
146 | { | |
ab14de6c HC |
147 | unsigned long val0 = 0; |
148 | unsigned long val1 = 0xc; | |
149 | int ret = -ENOSYS; | |
150 | ||
151 | if (ipl_flags & IPL_NSS_VALID) | |
152 | return -ENOSYS; | |
153 | ||
154 | asm volatile( | |
155 | " diag %1,%2,0x260\n" | |
156 | "0: lhi %0,0\n" | |
157 | "1:\n" | |
158 | EX_TABLE(0b,1b) | |
159 | : "+d" (ret), "+d" (val0), "+d" (val1) : : "cc"); | |
160 | ||
161 | if (ret || val0 != val1) | |
162 | return -ENOSYS; | |
163 | ||
257c6e1c | 164 | memory_chunk[0].size = val0 + 1; |
ab14de6c HC |
165 | return 0; |
166 | } | |
257c6e1c HC |
167 | #else |
168 | static inline int memory_fast_detect(void) | |
169 | { | |
170 | return -ENOSYS; | |
171 | } | |
172 | #endif | |
ab14de6c HC |
173 | |
174 | #define ADDR2G (1UL << 31) | |
175 | ||
176 | static noinline __init unsigned long sclp_memory_detect(void) | |
177 | { | |
178 | struct sclp_readinfo_sccb *sccb; | |
179 | unsigned long long memsize; | |
180 | ||
181 | sccb = &s390_readinfo_sccb; | |
182 | ||
183 | if (sccb->header.response_code != 0x10) | |
184 | return 0; | |
185 | ||
186 | if (sccb->rnsize) | |
187 | memsize = sccb->rnsize << 20; | |
188 | else | |
189 | memsize = sccb->rnsize2 << 20; | |
190 | if (sccb->rnmax) | |
191 | memsize *= sccb->rnmax; | |
192 | else | |
193 | memsize *= sccb->rnmax2; | |
194 | #ifndef CONFIG_64BIT | |
195 | /* | |
196 | * Can't deal with more than 2G in 31 bit addressing mode, so | |
197 | * limit the value in order to avoid strange side effects. | |
198 | */ | |
199 | if (memsize > ADDR2G) | |
200 | memsize = ADDR2G; | |
201 | #endif | |
202 | return (unsigned long) memsize; | |
203 | } | |
204 | ||
205 | static inline __init unsigned long __tprot(unsigned long addr) | |
206 | { | |
207 | int cc = -1; | |
208 | ||
209 | asm volatile( | |
210 | " tprot 0(%1),0\n" | |
211 | "0: ipm %0\n" | |
212 | " srl %0,28\n" | |
213 | "1:\n" | |
214 | EX_TABLE(0b,1b) | |
215 | : "+d" (cc) : "a" (addr) : "cc"); | |
216 | return (unsigned long)cc; | |
217 | } | |
218 | ||
219 | /* Checking memory in 128KB increments. */ | |
220 | #define CHUNK_INCR (1UL << 17) | |
221 | ||
222 | static noinline __init void find_memory_chunks(unsigned long memsize) | |
223 | { | |
224 | unsigned long addr = 0, old_addr = 0; | |
225 | unsigned long old_cc = CHUNK_READ_WRITE; | |
226 | unsigned long cc; | |
227 | int chunk = 0; | |
228 | ||
229 | while (chunk < MEMORY_CHUNKS) { | |
230 | cc = __tprot(addr); | |
231 | while (cc == old_cc) { | |
232 | addr += CHUNK_INCR; | |
233 | cc = __tprot(addr); | |
234 | #ifndef CONFIG_64BIT | |
235 | if (addr == ADDR2G) | |
236 | break; | |
237 | #endif | |
238 | } | |
239 | ||
240 | if (old_addr != addr && | |
241 | (old_cc == CHUNK_READ_WRITE || old_cc == CHUNK_READ_ONLY)) { | |
242 | memory_chunk[chunk].addr = old_addr; | |
243 | memory_chunk[chunk].size = addr - old_addr; | |
244 | memory_chunk[chunk].type = old_cc; | |
245 | chunk++; | |
246 | } | |
247 | ||
248 | old_addr = addr; | |
249 | old_cc = cc; | |
250 | ||
251 | #ifndef CONFIG_64BIT | |
252 | if (addr == ADDR2G) | |
253 | break; | |
254 | #endif | |
255 | /* | |
29c380f5 HC |
256 | * Finish memory detection at the first hole |
257 | * if storage size is unknown. | |
ab14de6c | 258 | */ |
29c380f5 | 259 | if (cc == -1UL && !memsize) |
ab14de6c HC |
260 | break; |
261 | if (memsize && addr >= memsize) | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
266 | static __init void early_pgm_check_handler(void) | |
267 | { | |
268 | unsigned long addr; | |
269 | const struct exception_table_entry *fixup; | |
270 | ||
271 | addr = S390_lowcore.program_old_psw.addr; | |
272 | fixup = search_exception_tables(addr & PSW_ADDR_INSN); | |
273 | if (!fixup) | |
274 | disabled_wait(0); | |
275 | S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; | |
276 | } | |
277 | ||
278 | static noinline __init void setup_lowcore_early(void) | |
279 | { | |
280 | psw_t psw; | |
281 | ||
282 | psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; | |
283 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; | |
284 | S390_lowcore.external_new_psw = psw; | |
285 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; | |
286 | S390_lowcore.program_new_psw = psw; | |
287 | s390_base_pgm_handler_fn = early_pgm_check_handler; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Save ipl parameters, clear bss memory, initialize storage keys | |
292 | * and create a kernel NSS at startup if the SAVESYS= parm is defined | |
293 | */ | |
294 | void __init startup_init(void) | |
295 | { | |
296 | unsigned long memsize; | |
297 | ||
298 | ipl_save_parameters(); | |
299 | clear_bss_section(); | |
300 | init_kernel_storage_key(); | |
301 | lockdep_init(); | |
302 | lockdep_off(); | |
303 | detect_machine_type(); | |
304 | create_kernel_nss(); | |
305 | sort_main_extable(); | |
306 | setup_lowcore_early(); | |
307 | sclp_readinfo_early(); | |
308 | memsize = sclp_memory_detect(); | |
309 | if (memory_fast_detect() < 0) | |
310 | find_memory_chunks(memsize); | |
311 | lockdep_on(); | |
312 | } |