2 * arch/s390/kernel/early.c
4 * Copyright IBM Corp. 2007, 2009
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
9 #include <linux/compiler.h>
10 #include <linux/init.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/ctype.h>
14 #include <linux/ftrace.h>
15 #include <linux/lockdep.h>
16 #include <linux/module.h>
17 #include <linux/pfn.h>
18 #include <linux/uaccess.h>
19 #include <asm/ebcdic.h>
21 #include <asm/lowcore.h>
22 #include <asm/processor.h>
23 #include <asm/sections.h>
24 #include <asm/setup.h>
25 #include <asm/sysinfo.h>
26 #include <asm/cpcmd.h>
31 * Create a Kernel NSS if the SAVESYS= parameter is defined
33 #define DEFSYS_CMD_SIZE 128
34 #define SAVESYS_CMD_SIZE 32
36 char kernel_nss_name[NSS_NAME_SIZE + 1];
38 static unsigned long machine_flags;
40 static void __init setup_boot_command_line(void);
43 * Get the TOD clock running.
45 static void __init reset_tod_clock(void)
49 if (store_clock(&time) == 0)
51 /* TOD clock not running. Set the clock to Unix Epoch. */
52 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
55 sched_clock_base_cc = TOD_UNIX_EPOCH;
58 #ifdef CONFIG_SHARED_KERNEL
59 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
62 " .section .init.text,\"ax\",@progbits\n"
64 " .type savesys_ipl_nss, @function\n"
82 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
84 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
86 static noinline __init void create_kernel_nss(void)
88 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
89 #ifdef CONFIG_BLK_DEV_INITRD
90 unsigned int sinitrd_pfn, einitrd_pfn;
95 char defsys_cmd[DEFSYS_CMD_SIZE];
96 char savesys_cmd[SAVESYS_CMD_SIZE];
98 /* Do nothing if we are not running under VM */
102 /* Convert COMMAND_LINE to upper case */
103 for (i = 0; i < strlen(boot_command_line); i++)
104 upper_command_line[i] = toupper(boot_command_line[i]);
106 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
111 savesys_ptr += 8; /* Point to the beginning of the NSS name */
112 for (i = 0; i < NSS_NAME_SIZE; i++) {
113 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
115 kernel_nss_name[i] = savesys_ptr[i];
118 stext_pfn = PFN_DOWN(__pa(&_stext));
119 eshared_pfn = PFN_DOWN(__pa(&_eshared));
120 end_pfn = PFN_UP(__pa(&_end));
121 min_size = end_pfn << 2;
123 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
124 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
125 eshared_pfn, end_pfn);
127 #ifdef CONFIG_BLK_DEV_INITRD
128 if (INITRD_START && INITRD_SIZE) {
129 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
130 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
131 min_size = einitrd_pfn << 2;
132 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
133 sinitrd_pfn, einitrd_pfn);
137 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
138 defsys_cmd, min_size);
139 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
140 kernel_nss_name, kernel_nss_name);
142 __cpcmd(defsys_cmd, NULL, 0, &response);
145 kernel_nss_name[0] = '\0';
149 len = strlen(savesys_cmd);
150 ASCEBC(savesys_cmd, len);
151 response = savesys_ipl_nss(savesys_cmd, len);
153 /* On success: response is equal to the command size,
154 * max SAVESYS_CMD_SIZE
155 * On error: response contains the numeric portion of cp error message.
156 * for SAVESYS it will be >= 263
158 if (response > SAVESYS_CMD_SIZE) {
159 kernel_nss_name[0] = '\0';
163 /* re-setup boot command line with new ipl vm parms */
164 ipl_update_parameters();
165 setup_boot_command_line();
167 ipl_flags = IPL_NSS_VALID;
170 #else /* CONFIG_SHARED_KERNEL */
172 static inline void create_kernel_nss(void) { }
174 #endif /* CONFIG_SHARED_KERNEL */
179 static noinline __init void clear_bss_section(void)
181 memset(__bss_start, 0, __bss_stop - __bss_start);
185 * Initialize storage key for kernel pages
187 static noinline __init void init_kernel_storage_key(void)
189 unsigned long end_pfn, init_pfn;
191 end_pfn = PFN_UP(__pa(&_end));
193 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
194 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
197 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
199 static noinline __init void detect_machine_type(void)
201 /* No VM information? Looks like LPAR */
202 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
207 /* Running under KVM? If not we assume z/VM */
208 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
209 machine_flags |= MACHINE_FLAG_KVM;
211 machine_flags |= MACHINE_FLAG_VM;
213 /* Store machine flags for setting up lowcore early */
214 S390_lowcore.machine_flags = machine_flags;
217 static __init void early_pgm_check_handler(void)
220 const struct exception_table_entry *fixup;
222 addr = S390_lowcore.program_old_psw.addr;
223 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
226 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
229 static noinline __init void setup_lowcore_early(void)
233 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
234 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
235 S390_lowcore.external_new_psw = psw;
236 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
237 S390_lowcore.program_new_psw = psw;
238 s390_base_pgm_handler_fn = early_pgm_check_handler;
241 static noinline __init void setup_hpage(void)
243 #ifndef CONFIG_DEBUG_PAGEALLOC
244 unsigned int facilities;
247 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
249 machine_flags |= MACHINE_FLAG_HPAGE;
250 __ctl_set_bit(0, 23);
254 static __init void detect_mvpg(void)
265 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
267 machine_flags |= MACHINE_FLAG_MVPG;
271 static __init void detect_ieee(void)
281 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
283 machine_flags |= MACHINE_FLAG_IEEE;
287 static __init void detect_csp(void)
300 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
302 machine_flags |= MACHINE_FLAG_CSP;
306 static __init void detect_diag9c(void)
308 unsigned int cpu_address;
311 cpu_address = stap();
317 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
319 machine_flags |= MACHINE_FLAG_DIAG9C;
322 static __init void detect_diag44(void)
332 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
334 machine_flags |= MACHINE_FLAG_DIAG44;
338 static __init void detect_machine_facilities(void)
341 unsigned int facilities;
344 if (facilities & (1 << 28))
345 machine_flags |= MACHINE_FLAG_IDTE;
346 if (facilities & (1 << 23))
347 machine_flags |= MACHINE_FLAG_PFMF;
348 if (facilities & (1 << 4))
349 machine_flags |= MACHINE_FLAG_MVCOS;
353 static __init void rescue_initrd(void)
355 #ifdef CONFIG_BLK_DEV_INITRD
357 * Move the initrd right behind the bss section in case it starts
358 * within the bss section. So we don't overwrite it when the bss
359 * section gets cleared.
361 if (!INITRD_START || !INITRD_SIZE)
363 if (INITRD_START >= (unsigned long) __bss_stop)
365 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
366 INITRD_START = (unsigned long) __bss_stop;
370 /* Set up boot command line */
371 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
376 len = strlen(boot_command_line);
378 delim = boot_command_line + len; /* '\0' character position */
379 parm = boot_command_line + len + 1; /* append right after '\0' */
381 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
384 memmove(boot_command_line, parm + 1, rc);
386 *delim = ' '; /* replace '\0' with space */
390 static void __init setup_boot_command_line(void)
392 /* copy arch command line */
393 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
395 /* append IPL PARM data to the boot command line */
397 append_to_cmdline(append_ipl_vmparm);
399 append_to_cmdline(append_ipl_scpdata);
404 * Save ipl parameters, clear bss memory, initialize storage keys
405 * and create a kernel NSS at startup if the SAVESYS= parm is defined
407 void __init startup_init(void)
410 ipl_save_parameters();
413 init_kernel_storage_key();
417 setup_lowcore_early();
418 detect_machine_type();
419 ipl_update_parameters();
420 setup_boot_command_line();
427 detect_machine_facilities();
429 sclp_facilities_detect();
430 detect_memory_layout(memory_chunk);
431 S390_lowcore.machine_flags = machine_flags;
432 #ifdef CONFIG_DYNAMIC_FTRACE
433 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;