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 #define KMSG_COMPONENT "setup"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/compiler.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/ctype.h>
17 #include <linux/ftrace.h>
18 #include <linux/lockdep.h>
19 #include <linux/module.h>
20 #include <linux/pfn.h>
21 #include <linux/uaccess.h>
22 #include <linux/kernel.h>
23 #include <asm/ebcdic.h>
25 #include <asm/lowcore.h>
26 #include <asm/processor.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/sysinfo.h>
30 #include <asm/cpcmd.h>
35 * Create a Kernel NSS if the SAVESYS= parameter is defined
37 #define DEFSYS_CMD_SIZE 128
38 #define SAVESYS_CMD_SIZE 32
40 char kernel_nss_name[NSS_NAME_SIZE + 1];
42 static void __init setup_boot_command_line(void);
45 * Get the TOD clock running.
47 static void __init reset_tod_clock(void)
51 if (store_clock(&time) == 0)
53 /* TOD clock not running. Set the clock to Unix Epoch. */
54 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
57 sched_clock_base_cc = TOD_UNIX_EPOCH;
58 S390_lowcore.last_update_clock = sched_clock_base_cc;
61 #ifdef CONFIG_SHARED_KERNEL
62 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
65 " .section .init.text,\"ax\",@progbits\n"
67 " .type savesys_ipl_nss, @function\n"
85 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
87 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
89 static noinline __init void create_kernel_nss(void)
91 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
92 #ifdef CONFIG_BLK_DEV_INITRD
93 unsigned int sinitrd_pfn, einitrd_pfn;
98 char defsys_cmd[DEFSYS_CMD_SIZE];
99 char savesys_cmd[SAVESYS_CMD_SIZE];
101 /* Do nothing if we are not running under VM */
105 /* Convert COMMAND_LINE to upper case */
106 for (i = 0; i < strlen(boot_command_line); i++)
107 upper_command_line[i] = toupper(boot_command_line[i]);
109 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
114 savesys_ptr += 8; /* Point to the beginning of the NSS name */
115 for (i = 0; i < NSS_NAME_SIZE; i++) {
116 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
118 kernel_nss_name[i] = savesys_ptr[i];
121 stext_pfn = PFN_DOWN(__pa(&_stext));
122 eshared_pfn = PFN_DOWN(__pa(&_eshared));
123 end_pfn = PFN_UP(__pa(&_end));
124 min_size = end_pfn << 2;
126 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
127 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
128 eshared_pfn, end_pfn);
130 #ifdef CONFIG_BLK_DEV_INITRD
131 if (INITRD_START && INITRD_SIZE) {
132 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
133 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
134 min_size = einitrd_pfn << 2;
135 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
136 sinitrd_pfn, einitrd_pfn);
140 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
141 defsys_cmd, min_size);
142 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
143 kernel_nss_name, kernel_nss_name);
145 __cpcmd(defsys_cmd, NULL, 0, &response);
148 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
150 kernel_nss_name[0] = '\0';
154 len = strlen(savesys_cmd);
155 ASCEBC(savesys_cmd, len);
156 response = savesys_ipl_nss(savesys_cmd, len);
158 /* On success: response is equal to the command size,
159 * max SAVESYS_CMD_SIZE
160 * On error: response contains the numeric portion of cp error message.
161 * for SAVESYS it will be >= 263
162 * for missing privilege class, it will be 1
164 if (response > SAVESYS_CMD_SIZE || response == 1) {
165 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
167 kernel_nss_name[0] = '\0';
171 /* re-initialize cputime accounting. */
172 sched_clock_base_cc = get_clock();
173 S390_lowcore.last_update_clock = sched_clock_base_cc;
174 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
175 S390_lowcore.user_timer = 0;
176 S390_lowcore.system_timer = 0;
177 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
179 /* re-setup boot command line with new ipl vm parms */
180 ipl_update_parameters();
181 setup_boot_command_line();
183 ipl_flags = IPL_NSS_VALID;
186 #else /* CONFIG_SHARED_KERNEL */
188 static inline void create_kernel_nss(void) { }
190 #endif /* CONFIG_SHARED_KERNEL */
195 static noinline __init void clear_bss_section(void)
197 memset(__bss_start, 0, __bss_stop - __bss_start);
201 * Initialize storage key for kernel pages
203 static noinline __init void init_kernel_storage_key(void)
205 unsigned long end_pfn, init_pfn;
207 end_pfn = PFN_UP(__pa(&_end));
209 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
210 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
213 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
215 static noinline __init void detect_machine_type(void)
217 /* No VM information? Looks like LPAR */
218 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
223 /* Running under KVM? If not we assume z/VM */
224 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
225 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
227 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
230 static __init void early_pgm_check_handler(void)
233 const struct exception_table_entry *fixup;
235 addr = S390_lowcore.program_old_psw.addr;
236 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
239 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
242 static noinline __init void setup_lowcore_early(void)
246 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
247 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
248 S390_lowcore.external_new_psw = psw;
249 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
250 S390_lowcore.program_new_psw = psw;
251 s390_base_pgm_handler_fn = early_pgm_check_handler;
254 static noinline __init void setup_hpage(void)
256 #ifndef CONFIG_DEBUG_PAGEALLOC
257 unsigned int facilities;
260 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
262 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
263 __ctl_set_bit(0, 23);
267 static __init void detect_mvpg(void)
278 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
280 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
284 static __init void detect_ieee(void)
294 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
296 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
300 static __init void detect_csp(void)
313 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
315 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
319 static __init void detect_diag9c(void)
321 unsigned int cpu_address;
324 cpu_address = stap();
330 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
332 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
335 static __init void detect_diag44(void)
345 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
347 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
351 static __init void detect_machine_facilities(void)
354 unsigned int facilities;
357 if (facilities & (1 << 28))
358 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
359 if (facilities & (1 << 23))
360 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
361 if (facilities & (1 << 4))
362 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
366 static __init void rescue_initrd(void)
368 #ifdef CONFIG_BLK_DEV_INITRD
370 * Move the initrd right behind the bss section in case it starts
371 * within the bss section. So we don't overwrite it when the bss
372 * section gets cleared.
374 if (!INITRD_START || !INITRD_SIZE)
376 if (INITRD_START >= (unsigned long) __bss_stop)
378 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
379 INITRD_START = (unsigned long) __bss_stop;
383 /* Set up boot command line */
384 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
389 len = strlen(boot_command_line);
391 delim = boot_command_line + len; /* '\0' character position */
392 parm = boot_command_line + len + 1; /* append right after '\0' */
394 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
397 memmove(boot_command_line, parm + 1, rc);
399 *delim = ' '; /* replace '\0' with space */
403 static void __init setup_boot_command_line(void)
405 /* copy arch command line */
406 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
408 /* append IPL PARM data to the boot command line */
410 append_to_cmdline(append_ipl_vmparm);
412 append_to_cmdline(append_ipl_scpdata);
417 * Save ipl parameters, clear bss memory, initialize storage keys
418 * and create a kernel NSS at startup if the SAVESYS= parm is defined
420 void __init startup_init(void)
423 ipl_save_parameters();
426 init_kernel_storage_key();
430 setup_lowcore_early();
431 detect_machine_type();
432 ipl_update_parameters();
433 setup_boot_command_line();
440 detect_machine_facilities();
442 sclp_facilities_detect();
443 detect_memory_layout(memory_chunk);
444 #ifdef CONFIG_DYNAMIC_FTRACE
445 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;