2 * Copyright IBM Corp. 2007, 2009
3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
4 * Heiko Carstens <heiko.carstens@de.ibm.com>
7 #define KMSG_COMPONENT "setup"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <linux/compiler.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/ctype.h>
15 #include <linux/lockdep.h>
16 #include <linux/module.h>
17 #include <linux/pfn.h>
18 #include <linux/uaccess.h>
19 #include <linux/kernel.h>
21 #include <asm/ebcdic.h>
23 #include <asm/lowcore.h>
24 #include <asm/processor.h>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sysinfo.h>
28 #include <asm/cpcmd.h>
30 #include <asm/facility.h>
34 * Create a Kernel NSS if the SAVESYS= parameter is defined
36 #define DEFSYS_CMD_SIZE 128
37 #define SAVESYS_CMD_SIZE 32
39 char kernel_nss_name[NSS_NAME_SIZE + 1];
41 static void __init setup_boot_command_line(void);
44 * Get the TOD clock running.
46 static void __init reset_tod_clock(void)
50 if (store_tod_clock(&time) == 0)
52 /* TOD clock not running. Set the clock to Unix Epoch. */
53 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
56 sched_clock_base_cc = TOD_UNIX_EPOCH;
57 S390_lowcore.last_update_clock = sched_clock_base_cc;
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"
76 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
79 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
81 static noinline __init void create_kernel_nss(void)
83 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
84 #ifdef CONFIG_BLK_DEV_INITRD
85 unsigned int sinitrd_pfn, einitrd_pfn;
91 char defsys_cmd[DEFSYS_CMD_SIZE];
92 char savesys_cmd[SAVESYS_CMD_SIZE];
94 /* Do nothing if we are not running under VM */
98 /* Convert COMMAND_LINE to upper case */
99 for (i = 0; i < strlen(boot_command_line); i++)
100 upper_command_line[i] = toupper(boot_command_line[i]);
102 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
107 savesys_ptr += 8; /* Point to the beginning of the NSS name */
108 for (i = 0; i < NSS_NAME_SIZE; i++) {
109 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
111 kernel_nss_name[i] = savesys_ptr[i];
114 stext_pfn = PFN_DOWN(__pa(&_stext));
115 eshared_pfn = PFN_DOWN(__pa(&_eshared));
116 end_pfn = PFN_UP(__pa(&_end));
117 min_size = end_pfn << 2;
119 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
120 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
121 kernel_nss_name, stext_pfn - 1, stext_pfn,
122 eshared_pfn - 1, eshared_pfn, end_pfn);
124 #ifdef CONFIG_BLK_DEV_INITRD
125 if (INITRD_START && INITRD_SIZE) {
126 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
127 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
128 min_size = einitrd_pfn << 2;
129 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
130 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
134 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
135 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
136 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
137 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
138 kernel_nss_name, kernel_nss_name);
139 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
141 __cpcmd(defsys_cmd, NULL, 0, &response);
144 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
146 kernel_nss_name[0] = '\0';
150 len = strlen(savesys_cmd);
151 ASCEBC(savesys_cmd, len);
152 response = savesys_ipl_nss(savesys_cmd, len);
154 /* On success: response is equal to the command size,
155 * max SAVESYS_CMD_SIZE
156 * On error: response contains the numeric portion of cp error message.
157 * for SAVESYS it will be >= 263
158 * for missing privilege class, it will be 1
160 if (response > SAVESYS_CMD_SIZE || response == 1) {
161 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
163 kernel_nss_name[0] = '\0';
167 /* re-initialize cputime accounting. */
168 sched_clock_base_cc = get_tod_clock();
169 S390_lowcore.last_update_clock = sched_clock_base_cc;
170 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
171 S390_lowcore.user_timer = 0;
172 S390_lowcore.system_timer = 0;
173 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
175 /* re-setup boot command line with new ipl vm parms */
176 ipl_update_parameters();
177 setup_boot_command_line();
179 ipl_flags = IPL_NSS_VALID;
182 #else /* CONFIG_SHARED_KERNEL */
184 static inline void create_kernel_nss(void) { }
186 #endif /* CONFIG_SHARED_KERNEL */
191 static noinline __init void clear_bss_section(void)
193 memset(__bss_start, 0, __bss_stop - __bss_start);
197 * Initialize storage key for kernel pages
199 static noinline __init void init_kernel_storage_key(void)
202 unsigned long end_pfn, init_pfn;
204 end_pfn = PFN_UP(__pa(&_end));
206 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
207 page_set_storage_key(init_pfn << PAGE_SHIFT,
208 PAGE_DEFAULT_KEY, 0);
212 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
214 static noinline __init void detect_machine_type(void)
216 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
218 /* Check current-configuration-level */
219 if (stsi(NULL, 0, 0, 0) <= 2) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
223 /* Get virtual-machine cpu information. */
224 if (stsi(vmms, 3, 2, 2) || !vmms->count)
227 /* Running under KVM? If not we assume z/VM */
228 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
234 static __init void setup_topology(void)
238 if (!test_facility(11))
240 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
241 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
242 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
245 topology_max_mnest = max_mnest;
248 static void early_pgm_check_handler(void)
250 const struct exception_table_entry *fixup;
251 unsigned long cr0, cr0_new;
254 addr = S390_lowcore.program_old_psw.addr;
255 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
258 /* Disable low address protection before storing into lowcore. */
259 __ctl_store(cr0, 0, 0);
260 cr0_new = cr0 & ~(1UL << 28);
261 __ctl_load(cr0_new, 0, 0);
262 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
263 __ctl_load(cr0, 0, 0);
266 static noinline __init void setup_lowcore_early(void)
270 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
271 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
272 S390_lowcore.external_new_psw = psw;
273 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
274 S390_lowcore.program_new_psw = psw;
275 s390_base_pgm_handler_fn = early_pgm_check_handler;
278 static noinline __init void setup_facility_list(void)
280 stfle(S390_lowcore.stfle_fac_list,
281 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
284 static __init void detect_diag9c(void)
286 unsigned int cpu_address;
289 cpu_address = stap();
290 diag_stat_inc(DIAG_STAT_X09C);
296 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
298 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
301 static __init void detect_diag44(void)
305 diag_stat_inc(DIAG_STAT_X044);
311 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
313 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
316 static __init void detect_machine_facilities(void)
318 if (test_facility(8)) {
319 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
320 __ctl_set_bit(0, 23);
322 if (test_facility(78))
323 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
324 if (test_facility(3))
325 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
326 if (test_facility(40))
327 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
328 if (test_facility(50) && test_facility(73))
329 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
330 if (test_facility(51))
331 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
332 if (test_facility(129)) {
333 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
334 __ctl_set_bit(0, 17);
338 static int __init disable_vector_extension(char *str)
340 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
341 __ctl_clear_bit(0, 17);
344 early_param("novx", disable_vector_extension);
346 static int __init cad_setup(char *str)
350 get_option(&str, &val);
351 if (val && test_facility(128))
352 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
355 early_param("cad", cad_setup);
357 static int __init cad_init(void)
360 /* Enable problem state CAD. */
364 early_initcall(cad_init);
366 static __init void rescue_initrd(void)
368 #ifdef CONFIG_BLK_DEV_INITRD
369 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
371 * Just like in case of IPL from VM reader we make sure there is a
372 * gap of 4MB between end of kernel and start of initrd.
373 * That way we can also be sure that saving an NSS will succeed,
374 * which however only requires different segments.
376 if (!INITRD_START || !INITRD_SIZE)
378 if (INITRD_START >= min_initrd_addr)
380 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
381 INITRD_START = min_initrd_addr;
385 /* Set up boot command line */
386 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
391 len = strlen(boot_command_line);
393 delim = boot_command_line + len; /* '\0' character position */
394 parm = boot_command_line + len + 1; /* append right after '\0' */
396 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
399 memmove(boot_command_line, parm + 1, rc);
401 *delim = ' '; /* replace '\0' with space */
405 static inline int has_ebcdic_char(const char *str)
409 for (i = 0; str[i]; i++)
415 static void __init setup_boot_command_line(void)
417 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
418 /* convert arch command line to ascii if necessary */
419 if (has_ebcdic_char(COMMAND_LINE))
420 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
421 /* copy arch command line */
422 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
423 ARCH_COMMAND_LINE_SIZE);
425 /* append IPL PARM data to the boot command line */
427 append_to_cmdline(append_ipl_vmparm);
429 append_to_cmdline(append_ipl_scpdata);
433 * Save ipl parameters, clear bss memory, initialize storage keys
434 * and create a kernel NSS at startup if the SAVESYS= parm is defined
436 void __init startup_init(void)
439 ipl_save_parameters();
442 init_kernel_storage_key();
445 setup_lowcore_early();
446 setup_facility_list();
447 detect_machine_type();
448 ipl_update_parameters();
449 setup_boot_command_line();
453 detect_machine_facilities();