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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> | |
a806170e | 24 | #include "entry.h" |
ab14de6c HC |
25 | |
26 | /* | |
27 | * Create a Kernel NSS if the SAVESYS= parameter is defined | |
28 | */ | |
29 | #define DEFSYS_CMD_SIZE 96 | |
30 | #define SAVESYS_CMD_SIZE 32 | |
31 | ||
ab14de6c HC |
32 | char kernel_nss_name[NSS_NAME_SIZE + 1]; |
33 | ||
34 | #ifdef CONFIG_SHARED_KERNEL | |
35 | static noinline __init void create_kernel_nss(void) | |
36 | { | |
37 | unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; | |
38 | #ifdef CONFIG_BLK_DEV_INITRD | |
39 | unsigned int sinitrd_pfn, einitrd_pfn; | |
40 | #endif | |
41 | int response; | |
42 | char *savesys_ptr; | |
43 | char upper_command_line[COMMAND_LINE_SIZE]; | |
44 | char defsys_cmd[DEFSYS_CMD_SIZE]; | |
45 | char savesys_cmd[SAVESYS_CMD_SIZE]; | |
46 | ||
47 | /* Do nothing if we are not running under VM */ | |
48 | if (!MACHINE_IS_VM) | |
49 | return; | |
50 | ||
51 | /* Convert COMMAND_LINE to upper case */ | |
52 | for (i = 0; i < strlen(COMMAND_LINE); i++) | |
53 | upper_command_line[i] = toupper(COMMAND_LINE[i]); | |
54 | ||
55 | savesys_ptr = strstr(upper_command_line, "SAVESYS="); | |
56 | ||
57 | if (!savesys_ptr) | |
58 | return; | |
59 | ||
60 | savesys_ptr += 8; /* Point to the beginning of the NSS name */ | |
61 | for (i = 0; i < NSS_NAME_SIZE; i++) { | |
62 | if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') | |
63 | break; | |
64 | kernel_nss_name[i] = savesys_ptr[i]; | |
65 | } | |
66 | ||
67 | stext_pfn = PFN_DOWN(__pa(&_stext)); | |
68 | eshared_pfn = PFN_DOWN(__pa(&_eshared)); | |
69 | end_pfn = PFN_UP(__pa(&_end)); | |
70 | min_size = end_pfn << 2; | |
71 | ||
72 | sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", | |
73 | kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, | |
74 | eshared_pfn, end_pfn); | |
75 | ||
76 | #ifdef CONFIG_BLK_DEV_INITRD | |
77 | if (INITRD_START && INITRD_SIZE) { | |
78 | sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); | |
79 | einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); | |
80 | min_size = einitrd_pfn << 2; | |
81 | sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, | |
82 | sinitrd_pfn, einitrd_pfn); | |
83 | } | |
84 | #endif | |
85 | ||
86 | sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size); | |
87 | sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", | |
88 | kernel_nss_name, kernel_nss_name); | |
89 | ||
90 | __cpcmd(defsys_cmd, NULL, 0, &response); | |
91 | ||
583b33bc HY |
92 | if (response != 0) { |
93 | kernel_nss_name[0] = '\0'; | |
ab14de6c | 94 | return; |
583b33bc | 95 | } |
ab14de6c HC |
96 | |
97 | __cpcmd(savesys_cmd, NULL, 0, &response); | |
98 | ||
583b33bc HY |
99 | if (response != strlen(savesys_cmd)) { |
100 | kernel_nss_name[0] = '\0'; | |
ab14de6c | 101 | return; |
583b33bc | 102 | } |
ab14de6c HC |
103 | |
104 | ipl_flags = IPL_NSS_VALID; | |
105 | } | |
106 | ||
107 | #else /* CONFIG_SHARED_KERNEL */ | |
108 | ||
109 | static inline void create_kernel_nss(void) { } | |
110 | ||
111 | #endif /* CONFIG_SHARED_KERNEL */ | |
112 | ||
113 | /* | |
114 | * Clear bss memory | |
115 | */ | |
116 | static noinline __init void clear_bss_section(void) | |
117 | { | |
229d9c6d | 118 | memset(__bss_start, 0, __bss_stop - __bss_start); |
ab14de6c HC |
119 | } |
120 | ||
121 | /* | |
122 | * Initialize storage key for kernel pages | |
123 | */ | |
124 | static noinline __init void init_kernel_storage_key(void) | |
125 | { | |
126 | unsigned long end_pfn, init_pfn; | |
127 | ||
128 | end_pfn = PFN_UP(__pa(&_end)); | |
129 | ||
130 | for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) | |
131 | page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); | |
132 | } | |
133 | ||
134 | static noinline __init void detect_machine_type(void) | |
135 | { | |
136 | struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; | |
137 | ||
72960a02 | 138 | get_cpu_id(&S390_lowcore.cpu_data.cpu_id); |
ab14de6c HC |
139 | |
140 | /* Running under z/VM ? */ | |
141 | if (cpuinfo->cpu_id.version == 0xff) | |
142 | machine_flags |= 1; | |
143 | ||
144 | /* Running on a P/390 ? */ | |
145 | if (cpuinfo->cpu_id.machine == 0x7490) | |
146 | machine_flags |= 4; | |
147 | } | |
148 | ||
257c6e1c | 149 | #ifdef CONFIG_64BIT |
ab14de6c HC |
150 | static noinline __init int memory_fast_detect(void) |
151 | { | |
ab14de6c HC |
152 | unsigned long val0 = 0; |
153 | unsigned long val1 = 0xc; | |
154 | int ret = -ENOSYS; | |
155 | ||
156 | if (ipl_flags & IPL_NSS_VALID) | |
157 | return -ENOSYS; | |
158 | ||
159 | asm volatile( | |
160 | " diag %1,%2,0x260\n" | |
161 | "0: lhi %0,0\n" | |
162 | "1:\n" | |
163 | EX_TABLE(0b,1b) | |
164 | : "+d" (ret), "+d" (val0), "+d" (val1) : : "cc"); | |
165 | ||
166 | if (ret || val0 != val1) | |
167 | return -ENOSYS; | |
168 | ||
257c6e1c | 169 | memory_chunk[0].size = val0 + 1; |
ab14de6c HC |
170 | return 0; |
171 | } | |
257c6e1c HC |
172 | #else |
173 | static inline int memory_fast_detect(void) | |
174 | { | |
175 | return -ENOSYS; | |
176 | } | |
177 | #endif | |
ab14de6c | 178 | |
ab14de6c HC |
179 | static inline __init unsigned long __tprot(unsigned long addr) |
180 | { | |
181 | int cc = -1; | |
182 | ||
183 | asm volatile( | |
184 | " tprot 0(%1),0\n" | |
185 | "0: ipm %0\n" | |
186 | " srl %0,28\n" | |
187 | "1:\n" | |
188 | EX_TABLE(0b,1b) | |
189 | : "+d" (cc) : "a" (addr) : "cc"); | |
190 | return (unsigned long)cc; | |
191 | } | |
192 | ||
193 | /* Checking memory in 128KB increments. */ | |
194 | #define CHUNK_INCR (1UL << 17) | |
05dd2530 | 195 | #define ADDR2G (1UL << 31) |
ab14de6c HC |
196 | |
197 | static noinline __init void find_memory_chunks(unsigned long memsize) | |
198 | { | |
199 | unsigned long addr = 0, old_addr = 0; | |
200 | unsigned long old_cc = CHUNK_READ_WRITE; | |
201 | unsigned long cc; | |
202 | int chunk = 0; | |
203 | ||
204 | while (chunk < MEMORY_CHUNKS) { | |
205 | cc = __tprot(addr); | |
206 | while (cc == old_cc) { | |
207 | addr += CHUNK_INCR; | |
a2cb0737 | 208 | if (memsize && addr >= memsize) |
0b8da654 | 209 | break; |
ab14de6c HC |
210 | #ifndef CONFIG_64BIT |
211 | if (addr == ADDR2G) | |
212 | break; | |
213 | #endif | |
0b8da654 | 214 | cc = __tprot(addr); |
ab14de6c HC |
215 | } |
216 | ||
217 | if (old_addr != addr && | |
218 | (old_cc == CHUNK_READ_WRITE || old_cc == CHUNK_READ_ONLY)) { | |
219 | memory_chunk[chunk].addr = old_addr; | |
220 | memory_chunk[chunk].size = addr - old_addr; | |
221 | memory_chunk[chunk].type = old_cc; | |
222 | chunk++; | |
223 | } | |
224 | ||
225 | old_addr = addr; | |
226 | old_cc = cc; | |
227 | ||
228 | #ifndef CONFIG_64BIT | |
229 | if (addr == ADDR2G) | |
230 | break; | |
231 | #endif | |
232 | /* | |
29c380f5 HC |
233 | * Finish memory detection at the first hole |
234 | * if storage size is unknown. | |
ab14de6c | 235 | */ |
29c380f5 | 236 | if (cc == -1UL && !memsize) |
ab14de6c HC |
237 | break; |
238 | if (memsize && addr >= memsize) | |
239 | break; | |
240 | } | |
241 | } | |
242 | ||
243 | static __init void early_pgm_check_handler(void) | |
244 | { | |
245 | unsigned long addr; | |
246 | const struct exception_table_entry *fixup; | |
247 | ||
248 | addr = S390_lowcore.program_old_psw.addr; | |
249 | fixup = search_exception_tables(addr & PSW_ADDR_INSN); | |
250 | if (!fixup) | |
251 | disabled_wait(0); | |
252 | S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; | |
253 | } | |
254 | ||
255 | static noinline __init void setup_lowcore_early(void) | |
256 | { | |
257 | psw_t psw; | |
258 | ||
259 | psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; | |
260 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; | |
261 | S390_lowcore.external_new_psw = psw; | |
262 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; | |
263 | S390_lowcore.program_new_psw = psw; | |
264 | s390_base_pgm_handler_fn = early_pgm_check_handler; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Save ipl parameters, clear bss memory, initialize storage keys | |
269 | * and create a kernel NSS at startup if the SAVESYS= parm is defined | |
270 | */ | |
271 | void __init startup_init(void) | |
272 | { | |
05dd2530 | 273 | unsigned long long memsize; |
ab14de6c HC |
274 | |
275 | ipl_save_parameters(); | |
276 | clear_bss_section(); | |
277 | init_kernel_storage_key(); | |
278 | lockdep_init(); | |
279 | lockdep_off(); | |
280 | detect_machine_type(); | |
281 | create_kernel_nss(); | |
282 | sort_main_extable(); | |
283 | setup_lowcore_early(); | |
08d07968 | 284 | sclp_read_info_early(); |
83119ad4 | 285 | sclp_facilities_detect(); |
ab14de6c | 286 | memsize = sclp_memory_detect(); |
05dd2530 HC |
287 | #ifndef CONFIG_64BIT |
288 | /* | |
289 | * Can't deal with more than 2G in 31 bit addressing mode, so | |
290 | * limit the value in order to avoid strange side effects. | |
291 | */ | |
292 | if (memsize > ADDR2G) | |
293 | memsize = ADDR2G; | |
294 | #endif | |
ab14de6c | 295 | if (memory_fast_detect() < 0) |
05dd2530 | 296 | find_memory_chunks((unsigned long) memsize); |
ab14de6c HC |
297 | lockdep_on(); |
298 | } |