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;
60 #ifdef CONFIG_SHARED_KERNEL
61 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
64 " .section .init.text,\"ax\",@progbits\n"
66 " .type savesys_ipl_nss, @function\n"
84 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
86 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
88 static noinline __init void create_kernel_nss(void)
90 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
91 #ifdef CONFIG_BLK_DEV_INITRD
92 unsigned int sinitrd_pfn, einitrd_pfn;
97 char defsys_cmd[DEFSYS_CMD_SIZE];
98 char savesys_cmd[SAVESYS_CMD_SIZE];
100 /* Do nothing if we are not running under VM */
104 /* Convert COMMAND_LINE to upper case */
105 for (i = 0; i < strlen(boot_command_line); i++)
106 upper_command_line[i] = toupper(boot_command_line[i]);
108 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
113 savesys_ptr += 8; /* Point to the beginning of the NSS name */
114 for (i = 0; i < NSS_NAME_SIZE; i++) {
115 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
117 kernel_nss_name[i] = savesys_ptr[i];
120 stext_pfn = PFN_DOWN(__pa(&_stext));
121 eshared_pfn = PFN_DOWN(__pa(&_eshared));
122 end_pfn = PFN_UP(__pa(&_end));
123 min_size = end_pfn << 2;
125 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
126 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
127 eshared_pfn, end_pfn);
129 #ifdef CONFIG_BLK_DEV_INITRD
130 if (INITRD_START && INITRD_SIZE) {
131 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
132 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
133 min_size = einitrd_pfn << 2;
134 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
135 sinitrd_pfn, einitrd_pfn);
139 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
140 defsys_cmd, min_size);
141 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
142 kernel_nss_name, kernel_nss_name);
144 __cpcmd(defsys_cmd, NULL, 0, &response);
147 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
149 kernel_nss_name[0] = '\0';
153 len = strlen(savesys_cmd);
154 ASCEBC(savesys_cmd, len);
155 response = savesys_ipl_nss(savesys_cmd, len);
157 /* On success: response is equal to the command size,
158 * max SAVESYS_CMD_SIZE
159 * On error: response contains the numeric portion of cp error message.
160 * for SAVESYS it will be >= 263
161 * for missing privilege class, it will be 1
163 if (response > SAVESYS_CMD_SIZE || response == 1) {
164 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
166 kernel_nss_name[0] = '\0';
170 /* re-setup boot command line with new ipl vm parms */
171 ipl_update_parameters();
172 setup_boot_command_line();
174 ipl_flags = IPL_NSS_VALID;
177 #else /* CONFIG_SHARED_KERNEL */
179 static inline void create_kernel_nss(void) { }
181 #endif /* CONFIG_SHARED_KERNEL */
186 static noinline __init void clear_bss_section(void)
188 memset(__bss_start, 0, __bss_stop - __bss_start);
192 * Initialize storage key for kernel pages
194 static noinline __init void init_kernel_storage_key(void)
196 unsigned long end_pfn, init_pfn;
198 end_pfn = PFN_UP(__pa(&_end));
200 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
201 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
204 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
206 static noinline __init void detect_machine_type(void)
208 /* No VM information? Looks like LPAR */
209 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
214 /* Running under KVM? If not we assume z/VM */
215 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
216 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
218 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
221 static __init void early_pgm_check_handler(void)
224 const struct exception_table_entry *fixup;
226 addr = S390_lowcore.program_old_psw.addr;
227 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
230 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
233 static noinline __init void setup_lowcore_early(void)
237 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
238 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
239 S390_lowcore.external_new_psw = psw;
240 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
241 S390_lowcore.program_new_psw = psw;
242 s390_base_pgm_handler_fn = early_pgm_check_handler;
245 static noinline __init void setup_hpage(void)
247 #ifndef CONFIG_DEBUG_PAGEALLOC
248 unsigned int facilities;
251 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
253 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
254 __ctl_set_bit(0, 23);
258 static __init void detect_mvpg(void)
269 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
271 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
275 static __init void detect_ieee(void)
285 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
287 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
291 static __init void detect_csp(void)
304 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
306 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
310 static __init void detect_diag9c(void)
312 unsigned int cpu_address;
315 cpu_address = stap();
321 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
323 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
326 static __init void detect_diag44(void)
336 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
338 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
342 static __init void detect_machine_facilities(void)
345 unsigned int facilities;
348 if (facilities & (1 << 28))
349 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
350 if (facilities & (1 << 23))
351 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
352 if (facilities & (1 << 4))
353 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
357 static __init void rescue_initrd(void)
359 #ifdef CONFIG_BLK_DEV_INITRD
361 * Move the initrd right behind the bss section in case it starts
362 * within the bss section. So we don't overwrite it when the bss
363 * section gets cleared.
365 if (!INITRD_START || !INITRD_SIZE)
367 if (INITRD_START >= (unsigned long) __bss_stop)
369 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
370 INITRD_START = (unsigned long) __bss_stop;
374 /* Set up boot command line */
375 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
380 len = strlen(boot_command_line);
382 delim = boot_command_line + len; /* '\0' character position */
383 parm = boot_command_line + len + 1; /* append right after '\0' */
385 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
388 memmove(boot_command_line, parm + 1, rc);
390 *delim = ' '; /* replace '\0' with space */
394 static void __init setup_boot_command_line(void)
396 /* copy arch command line */
397 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
399 /* append IPL PARM data to the boot command line */
401 append_to_cmdline(append_ipl_vmparm);
403 append_to_cmdline(append_ipl_scpdata);
408 * Save ipl parameters, clear bss memory, initialize storage keys
409 * and create a kernel NSS at startup if the SAVESYS= parm is defined
411 void __init startup_init(void)
414 ipl_save_parameters();
417 init_kernel_storage_key();
421 setup_lowcore_early();
422 detect_machine_type();
423 ipl_update_parameters();
424 setup_boot_command_line();
431 detect_machine_facilities();
433 sclp_facilities_detect();
434 detect_memory_layout(memory_chunk);
435 #ifdef CONFIG_DYNAMIC_FTRACE
436 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;