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>
20 #include <asm/ebcdic.h>
22 #include <asm/lowcore.h>
23 #include <asm/processor.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/sysinfo.h>
27 #include <asm/cpcmd.h>
29 #include <asm/facility.h>
33 * Create a Kernel NSS if the SAVESYS= parameter is defined
35 #define DEFSYS_CMD_SIZE 128
36 #define SAVESYS_CMD_SIZE 32
38 char kernel_nss_name[NSS_NAME_SIZE + 1];
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_tod_clock(&time) == 0)
51 /* TOD clock not running. Set the clock to Unix Epoch. */
52 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
55 sched_clock_base_cc = TOD_UNIX_EPOCH;
56 S390_lowcore.last_update_clock = sched_clock_base_cc;
59 #ifdef CONFIG_SHARED_KERNEL
60 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
63 " .section .init.text,\"ax\",@progbits\n"
65 " .type savesys_ipl_nss, @function\n"
83 " .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;
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 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
127 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
128 kernel_nss_name, stext_pfn - 1, stext_pfn,
129 eshared_pfn - 1, eshared_pfn, end_pfn);
131 #ifdef CONFIG_BLK_DEV_INITRD
132 if (INITRD_START && INITRD_SIZE) {
133 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
134 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
135 min_size = einitrd_pfn << 2;
136 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
137 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
141 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
142 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
143 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
144 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
145 kernel_nss_name, kernel_nss_name);
146 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
148 __cpcmd(defsys_cmd, NULL, 0, &response);
151 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
153 kernel_nss_name[0] = '\0';
157 len = strlen(savesys_cmd);
158 ASCEBC(savesys_cmd, len);
159 response = savesys_ipl_nss(savesys_cmd, len);
161 /* On success: response is equal to the command size,
162 * max SAVESYS_CMD_SIZE
163 * On error: response contains the numeric portion of cp error message.
164 * for SAVESYS it will be >= 263
165 * for missing privilege class, it will be 1
167 if (response > SAVESYS_CMD_SIZE || response == 1) {
168 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
170 kernel_nss_name[0] = '\0';
174 /* re-initialize cputime accounting. */
175 sched_clock_base_cc = get_tod_clock();
176 S390_lowcore.last_update_clock = sched_clock_base_cc;
177 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
178 S390_lowcore.user_timer = 0;
179 S390_lowcore.system_timer = 0;
180 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
182 /* re-setup boot command line with new ipl vm parms */
183 ipl_update_parameters();
184 setup_boot_command_line();
186 ipl_flags = IPL_NSS_VALID;
189 #else /* CONFIG_SHARED_KERNEL */
191 static inline void create_kernel_nss(void) { }
193 #endif /* CONFIG_SHARED_KERNEL */
198 static noinline __init void clear_bss_section(void)
200 memset(__bss_start, 0, __bss_stop - __bss_start);
204 * Initialize storage key for kernel pages
206 static noinline __init void init_kernel_storage_key(void)
209 unsigned long end_pfn, init_pfn;
211 end_pfn = PFN_UP(__pa(&_end));
213 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
214 page_set_storage_key(init_pfn << PAGE_SHIFT,
215 PAGE_DEFAULT_KEY, 0);
219 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
221 static noinline __init void detect_machine_type(void)
223 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
225 /* Check current-configuration-level */
226 if (stsi(NULL, 0, 0, 0) <= 2) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
230 /* Get virtual-machine cpu information. */
231 if (stsi(vmms, 3, 2, 2) || !vmms->count)
234 /* Running under KVM? If not we assume z/VM */
235 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
236 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
238 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
241 static __init void setup_topology(void)
246 if (!test_facility(11))
248 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
249 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
250 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
253 topology_max_mnest = max_mnest;
257 static void early_pgm_check_handler(void)
259 const struct exception_table_entry *fixup;
260 unsigned long cr0, cr0_new;
263 addr = S390_lowcore.program_old_psw.addr;
264 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
267 /* Disable low address protection before storing into lowcore. */
268 __ctl_store(cr0, 0, 0);
269 cr0_new = cr0 & ~(1UL << 28);
270 __ctl_load(cr0_new, 0, 0);
271 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
272 __ctl_load(cr0, 0, 0);
275 static noinline __init void setup_lowcore_early(void)
279 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
280 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
281 S390_lowcore.external_new_psw = psw;
282 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
283 S390_lowcore.program_new_psw = psw;
284 s390_base_pgm_handler_fn = early_pgm_check_handler;
287 static noinline __init void setup_facility_list(void)
289 stfle(S390_lowcore.stfle_fac_list,
290 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
293 static __init void detect_mvpg(void)
304 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
306 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
310 static __init void detect_ieee(void)
320 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
322 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
326 static __init void detect_csp(void)
339 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
341 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
345 static __init void detect_diag9c(void)
347 unsigned int cpu_address;
350 cpu_address = stap();
356 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
358 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
361 static __init void detect_diag44(void)
371 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
373 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
377 static __init void detect_machine_facilities(void)
380 if (test_facility(8)) {
381 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
382 __ctl_set_bit(0, 23);
384 if (test_facility(78))
385 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
386 if (test_facility(3))
387 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
388 if (test_facility(40))
389 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
390 if (test_facility(50) && test_facility(73))
391 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
392 if (test_facility(51))
393 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
394 if (test_facility(129))
395 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
399 static __init void rescue_initrd(void)
401 #ifdef CONFIG_BLK_DEV_INITRD
402 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
404 * Just like in case of IPL from VM reader we make sure there is a
405 * gap of 4MB between end of kernel and start of initrd.
406 * That way we can also be sure that saving an NSS will succeed,
407 * which however only requires different segments.
409 if (!INITRD_START || !INITRD_SIZE)
411 if (INITRD_START >= min_initrd_addr)
413 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
414 INITRD_START = min_initrd_addr;
418 /* Set up boot command line */
419 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
424 len = strlen(boot_command_line);
426 delim = boot_command_line + len; /* '\0' character position */
427 parm = boot_command_line + len + 1; /* append right after '\0' */
429 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
432 memmove(boot_command_line, parm + 1, rc);
434 *delim = ' '; /* replace '\0' with space */
438 static inline int has_ebcdic_char(const char *str)
442 for (i = 0; str[i]; i++)
448 static void __init setup_boot_command_line(void)
450 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
451 /* convert arch command line to ascii if necessary */
452 if (has_ebcdic_char(COMMAND_LINE))
453 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
454 /* copy arch command line */
455 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
456 ARCH_COMMAND_LINE_SIZE);
458 /* append IPL PARM data to the boot command line */
460 append_to_cmdline(append_ipl_vmparm);
462 append_to_cmdline(append_ipl_scpdata);
466 * Save ipl parameters, clear bss memory, initialize storage keys
467 * and create a kernel NSS at startup if the SAVESYS= parm is defined
469 void __init startup_init(void)
472 ipl_save_parameters();
475 init_kernel_storage_key();
478 setup_lowcore_early();
479 setup_facility_list();
480 detect_machine_type();
481 ipl_update_parameters();
482 setup_boot_command_line();
489 detect_machine_facilities();