1ab14de6cSHeiko Carstens /* 2155af2f9SHans-Joachim Picht * Copyright IBM Corp. 2007, 2009 3ab14de6cSHeiko Carstens * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 4ab14de6cSHeiko Carstens * Heiko Carstens <heiko.carstens@de.ibm.com> 5ab14de6cSHeiko Carstens */ 6ab14de6cSHeiko Carstens 711af97e1SHendrik Brueckner #define KMSG_COMPONENT "setup" 811af97e1SHendrik Brueckner #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 911af97e1SHendrik Brueckner 1092e6ecf3SChristian Borntraeger #include <linux/compiler.h> 11ab14de6cSHeiko Carstens #include <linux/init.h> 12ab14de6cSHeiko Carstens #include <linux/errno.h> 13ab14de6cSHeiko Carstens #include <linux/string.h> 14ab14de6cSHeiko Carstens #include <linux/ctype.h> 15ab14de6cSHeiko Carstens #include <linux/lockdep.h> 16dcc096c5SPaul Gortmaker #include <linux/extable.h> 17ab14de6cSHeiko Carstens #include <linux/pfn.h> 18ab14de6cSHeiko Carstens #include <linux/uaccess.h> 1911af97e1SHendrik Brueckner #include <linux/kernel.h> 201ec2772eSMartin Schwidefsky #include <asm/diag.h> 21a0443fbbSHendrik Brueckner #include <asm/ebcdic.h> 2246b05d26SMichael Holzheu #include <asm/ipl.h> 23ab14de6cSHeiko Carstens #include <asm/lowcore.h> 24ab14de6cSHeiko Carstens #include <asm/processor.h> 25ab14de6cSHeiko Carstens #include <asm/sections.h> 26ab14de6cSHeiko Carstens #include <asm/setup.h> 2792e6ecf3SChristian Borntraeger #include <asm/sysinfo.h> 28ab14de6cSHeiko Carstens #include <asm/cpcmd.h> 29ab14de6cSHeiko Carstens #include <asm/sclp.h> 30a0616cdeSDavid Howells #include <asm/facility.h> 31a806170eSHeiko Carstens #include "entry.h" 32ab14de6cSHeiko Carstens 33ab14de6cSHeiko Carstens /* 34ab14de6cSHeiko Carstens * Create a Kernel NSS if the SAVESYS= parameter is defined 35ab14de6cSHeiko Carstens */ 36a0443fbbSHendrik Brueckner #define DEFSYS_CMD_SIZE 128 37ab14de6cSHeiko Carstens #define SAVESYS_CMD_SIZE 32 38ab14de6cSHeiko Carstens 39ab14de6cSHeiko Carstens char kernel_nss_name[NSS_NAME_SIZE + 1]; 40ab14de6cSHeiko Carstens 41a0443fbbSHendrik Brueckner static void __init setup_boot_command_line(void); 42a0443fbbSHendrik Brueckner 43b6112ccbSMartin Schwidefsky /* 44b6112ccbSMartin Schwidefsky * Get the TOD clock running. 45b6112ccbSMartin Schwidefsky */ 46b6112ccbSMartin Schwidefsky static void __init reset_tod_clock(void) 47b6112ccbSMartin Schwidefsky { 48b6112ccbSMartin Schwidefsky u64 time; 49b6112ccbSMartin Schwidefsky 501aae0560SHeiko Carstens if (store_tod_clock(&time) == 0) 51b6112ccbSMartin Schwidefsky return; 52b6112ccbSMartin Schwidefsky /* TOD clock not running. Set the clock to Unix Epoch. */ 531aae0560SHeiko Carstens if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0) 54b6112ccbSMartin Schwidefsky disabled_wait(0); 55b6112ccbSMartin Schwidefsky 566e2ef5e4SMartin Schwidefsky memset(tod_clock_base, 0, 16); 576e2ef5e4SMartin Schwidefsky *(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH; 586e2ef5e4SMartin Schwidefsky S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; 59b6112ccbSMartin Schwidefsky } 60a0443fbbSHendrik Brueckner 61ab14de6cSHeiko Carstens #ifdef CONFIG_SHARED_KERNEL 62a0443fbbSHendrik Brueckner int __init savesys_ipl_nss(char *cmd, const int cmdlen); 63a0443fbbSHendrik Brueckner 64a0443fbbSHendrik Brueckner asm( 65a0443fbbSHendrik Brueckner " .section .init.text,\"ax\",@progbits\n" 66a0443fbbSHendrik Brueckner " .align 4\n" 67a0443fbbSHendrik Brueckner " .type savesys_ipl_nss, @function\n" 68a0443fbbSHendrik Brueckner "savesys_ipl_nss:\n" 69a0443fbbSHendrik Brueckner " stmg 6,15,48(15)\n" 70a0443fbbSHendrik Brueckner " lgr 14,3\n" 71a0443fbbSHendrik Brueckner " sam31\n" 72a0443fbbSHendrik Brueckner " diag 2,14,0x8\n" 73a0443fbbSHendrik Brueckner " sam64\n" 74a0443fbbSHendrik Brueckner " lgr 2,14\n" 75a0443fbbSHendrik Brueckner " lmg 6,15,48(15)\n" 76a0443fbbSHendrik Brueckner " br 14\n" 7718764463SHeiko Carstens " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 7818764463SHeiko Carstens " .previous\n"); 79a0443fbbSHendrik Brueckner 80684d2fd4SHendrik Brueckner static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 81684d2fd4SHendrik Brueckner 82ab14de6cSHeiko Carstens static noinline __init void create_kernel_nss(void) 83ab14de6cSHeiko Carstens { 84ab14de6cSHeiko Carstens unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 85ab14de6cSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 86ab14de6cSHeiko Carstens unsigned int sinitrd_pfn, einitrd_pfn; 87ab14de6cSHeiko Carstens #endif 88ab14de6cSHeiko Carstens int response; 8969ac43b0SChen Liu int hlen; 90a0443fbbSHendrik Brueckner size_t len; 91ab14de6cSHeiko Carstens char *savesys_ptr; 92ab14de6cSHeiko Carstens char defsys_cmd[DEFSYS_CMD_SIZE]; 93ab14de6cSHeiko Carstens char savesys_cmd[SAVESYS_CMD_SIZE]; 94ab14de6cSHeiko Carstens 95ab14de6cSHeiko Carstens /* Do nothing if we are not running under VM */ 96ab14de6cSHeiko Carstens if (!MACHINE_IS_VM) 97ab14de6cSHeiko Carstens return; 98ab14de6cSHeiko Carstens 99ab14de6cSHeiko Carstens /* Convert COMMAND_LINE to upper case */ 100a0443fbbSHendrik Brueckner for (i = 0; i < strlen(boot_command_line); i++) 101a0443fbbSHendrik Brueckner upper_command_line[i] = toupper(boot_command_line[i]); 102ab14de6cSHeiko Carstens 103ab14de6cSHeiko Carstens savesys_ptr = strstr(upper_command_line, "SAVESYS="); 104ab14de6cSHeiko Carstens 105ab14de6cSHeiko Carstens if (!savesys_ptr) 106ab14de6cSHeiko Carstens return; 107ab14de6cSHeiko Carstens 108ab14de6cSHeiko Carstens savesys_ptr += 8; /* Point to the beginning of the NSS name */ 109ab14de6cSHeiko Carstens for (i = 0; i < NSS_NAME_SIZE; i++) { 110ab14de6cSHeiko Carstens if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 111ab14de6cSHeiko Carstens break; 112ab14de6cSHeiko Carstens kernel_nss_name[i] = savesys_ptr[i]; 113ab14de6cSHeiko Carstens } 114ab14de6cSHeiko Carstens 115ab14de6cSHeiko Carstens stext_pfn = PFN_DOWN(__pa(&_stext)); 116ab14de6cSHeiko Carstens eshared_pfn = PFN_DOWN(__pa(&_eshared)); 117ab14de6cSHeiko Carstens end_pfn = PFN_UP(__pa(&_end)); 118ab14de6cSHeiko Carstens min_size = end_pfn << 2; 119ab14de6cSHeiko Carstens 12069ac43b0SChen Liu hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 12169ac43b0SChen Liu "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 12269ac43b0SChen Liu kernel_nss_name, stext_pfn - 1, stext_pfn, 12369ac43b0SChen Liu eshared_pfn - 1, eshared_pfn, end_pfn); 124ab14de6cSHeiko Carstens 125ab14de6cSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 126ab14de6cSHeiko Carstens if (INITRD_START && INITRD_SIZE) { 127ab14de6cSHeiko Carstens sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 128ab14de6cSHeiko Carstens einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 129ab14de6cSHeiko Carstens min_size = einitrd_pfn << 2; 13069ac43b0SChen Liu hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 13169ac43b0SChen Liu " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 132ab14de6cSHeiko Carstens } 133ab14de6cSHeiko Carstens #endif 134ab14de6cSHeiko Carstens 13569ac43b0SChen Liu snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 13669ac43b0SChen Liu " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 13769ac43b0SChen Liu defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 138894e491eSHeiko Carstens snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 139ab14de6cSHeiko Carstens kernel_nss_name, kernel_nss_name); 140894e491eSHeiko Carstens savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 141ab14de6cSHeiko Carstens 142ab14de6cSHeiko Carstens __cpcmd(defsys_cmd, NULL, 0, &response); 143ab14de6cSHeiko Carstens 144583b33bcSHongjie Yang if (response != 0) { 14511af97e1SHendrik Brueckner pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 14611af97e1SHendrik Brueckner response); 147583b33bcSHongjie Yang kernel_nss_name[0] = '\0'; 148ab14de6cSHeiko Carstens return; 149583b33bcSHongjie Yang } 150ab14de6cSHeiko Carstens 151a0443fbbSHendrik Brueckner len = strlen(savesys_cmd); 152a0443fbbSHendrik Brueckner ASCEBC(savesys_cmd, len); 153a0443fbbSHendrik Brueckner response = savesys_ipl_nss(savesys_cmd, len); 154ab14de6cSHeiko Carstens 155a0443fbbSHendrik Brueckner /* On success: response is equal to the command size, 156a0443fbbSHendrik Brueckner * max SAVESYS_CMD_SIZE 157a0443fbbSHendrik Brueckner * On error: response contains the numeric portion of cp error message. 158a0443fbbSHendrik Brueckner * for SAVESYS it will be >= 263 15911af97e1SHendrik Brueckner * for missing privilege class, it will be 1 160a0443fbbSHendrik Brueckner */ 16111af97e1SHendrik Brueckner if (response > SAVESYS_CMD_SIZE || response == 1) { 16211af97e1SHendrik Brueckner pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 16311af97e1SHendrik Brueckner response); 164583b33bcSHongjie Yang kernel_nss_name[0] = '\0'; 165ab14de6cSHeiko Carstens return; 166583b33bcSHongjie Yang } 167ab14de6cSHeiko Carstens 168b89031e0SMartin Schwidefsky /* re-initialize cputime accounting. */ 1696e2ef5e4SMartin Schwidefsky get_tod_clock_ext(tod_clock_base); 1706e2ef5e4SMartin Schwidefsky S390_lowcore.last_update_clock = *(__u64 *) &tod_clock_base[1]; 171b89031e0SMartin Schwidefsky S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 172b89031e0SMartin Schwidefsky S390_lowcore.user_timer = 0; 173b89031e0SMartin Schwidefsky S390_lowcore.system_timer = 0; 174b89031e0SMartin Schwidefsky asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 175b89031e0SMartin Schwidefsky 176a0443fbbSHendrik Brueckner /* re-setup boot command line with new ipl vm parms */ 177a0443fbbSHendrik Brueckner ipl_update_parameters(); 178a0443fbbSHendrik Brueckner setup_boot_command_line(); 179a0443fbbSHendrik Brueckner 180ab14de6cSHeiko Carstens ipl_flags = IPL_NSS_VALID; 181ab14de6cSHeiko Carstens } 182ab14de6cSHeiko Carstens 183ab14de6cSHeiko Carstens #else /* CONFIG_SHARED_KERNEL */ 184ab14de6cSHeiko Carstens 185ab14de6cSHeiko Carstens static inline void create_kernel_nss(void) { } 186ab14de6cSHeiko Carstens 187ab14de6cSHeiko Carstens #endif /* CONFIG_SHARED_KERNEL */ 188ab14de6cSHeiko Carstens 189ab14de6cSHeiko Carstens /* 190ab14de6cSHeiko Carstens * Clear bss memory 191ab14de6cSHeiko Carstens */ 192ab14de6cSHeiko Carstens static noinline __init void clear_bss_section(void) 193ab14de6cSHeiko Carstens { 194229d9c6dSHeiko Carstens memset(__bss_start, 0, __bss_stop - __bss_start); 195ab14de6cSHeiko Carstens } 196ab14de6cSHeiko Carstens 197ab14de6cSHeiko Carstens /* 198ab14de6cSHeiko Carstens * Initialize storage key for kernel pages 199ab14de6cSHeiko Carstens */ 200ab14de6cSHeiko Carstens static noinline __init void init_kernel_storage_key(void) 201ab14de6cSHeiko Carstens { 202127c1fefSMartin Schwidefsky #if PAGE_DEFAULT_KEY 203ab14de6cSHeiko Carstens unsigned long end_pfn, init_pfn; 204ab14de6cSHeiko Carstens 205ab14de6cSHeiko Carstens end_pfn = PFN_UP(__pa(&_end)); 206ab14de6cSHeiko Carstens 207ab14de6cSHeiko Carstens for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 208e2b8d7afSMartin Schwidefsky page_set_storage_key(init_pfn << PAGE_SHIFT, 209e2b8d7afSMartin Schwidefsky PAGE_DEFAULT_KEY, 0); 210127c1fefSMartin Schwidefsky #endif 211ab14de6cSHeiko Carstens } 212ab14de6cSHeiko Carstens 213fade4dc4SHeiko Carstens static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 21492e6ecf3SChristian Borntraeger 215ab14de6cSHeiko Carstens static noinline __init void detect_machine_type(void) 216ab14de6cSHeiko Carstens { 217fade4dc4SHeiko Carstens struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 218fade4dc4SHeiko Carstens 21927d71602SMartin Schwidefsky /* Check current-configuration-level */ 220caf757c6SHeiko Carstens if (stsi(NULL, 0, 0, 0) <= 2) { 22127d71602SMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 22292e6ecf3SChristian Borntraeger return; 22327d71602SMartin Schwidefsky } 22427d71602SMartin Schwidefsky /* Get virtual-machine cpu information. */ 225caf757c6SHeiko Carstens if (stsi(vmms, 3, 2, 2) || !vmms->count) 22692e6ecf3SChristian Borntraeger return; 227ab14de6cSHeiko Carstens 22892e6ecf3SChristian Borntraeger /* Running under KVM? If not we assume z/VM */ 229fade4dc4SHeiko Carstens if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 230d3135e0cSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 23192e6ecf3SChristian Borntraeger else 232d3135e0cSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 233ab14de6cSHeiko Carstens } 234ab14de6cSHeiko Carstens 235d2f03974SHeiko Carstens /* Remove leading, trailing and double whitespace. */ 236d2f03974SHeiko Carstens static inline void strim_all(char *str) 237d2f03974SHeiko Carstens { 238d2f03974SHeiko Carstens char *s; 239d2f03974SHeiko Carstens 240d2f03974SHeiko Carstens s = strim(str); 241d2f03974SHeiko Carstens if (s != str) 242d2f03974SHeiko Carstens memmove(str, s, strlen(s)); 243d2f03974SHeiko Carstens while (*str) { 244d2f03974SHeiko Carstens if (!isspace(*str++)) 245d2f03974SHeiko Carstens continue; 246d2f03974SHeiko Carstens if (isspace(*str)) { 247d2f03974SHeiko Carstens s = skip_spaces(str); 248d2f03974SHeiko Carstens memmove(str, s, strlen(s) + 1); 249d2f03974SHeiko Carstens } 250d2f03974SHeiko Carstens } 251d2f03974SHeiko Carstens } 252d2f03974SHeiko Carstens 2534b8fe77aSChristian Borntraeger static noinline __init void setup_arch_string(void) 2544b8fe77aSChristian Borntraeger { 2554b8fe77aSChristian Borntraeger struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 2562f8876f9SHeiko Carstens struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 2572f8876f9SHeiko Carstens char mstr[80], hvstr[17]; 2584b8fe77aSChristian Borntraeger 2594b8fe77aSChristian Borntraeger if (stsi(mach, 1, 1, 1)) 2604b8fe77aSChristian Borntraeger return; 2614b8fe77aSChristian Borntraeger EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 2624b8fe77aSChristian Borntraeger EBCASC(mach->type, sizeof(mach->type)); 2634b8fe77aSChristian Borntraeger EBCASC(mach->model, sizeof(mach->model)); 2644b8fe77aSChristian Borntraeger EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 265d2f03974SHeiko Carstens sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 266d2f03974SHeiko Carstens mach->manufacturer, mach->type, 267d2f03974SHeiko Carstens mach->model, mach->model_capacity); 268d2f03974SHeiko Carstens strim_all(mstr); 2692f8876f9SHeiko Carstens if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 2702f8876f9SHeiko Carstens EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 2712f8876f9SHeiko Carstens sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 2722f8876f9SHeiko Carstens strim_all(hvstr); 2732f8876f9SHeiko Carstens } else { 2742f8876f9SHeiko Carstens sprintf(hvstr, "%s", 2754b8fe77aSChristian Borntraeger MACHINE_IS_LPAR ? "LPAR" : 2764b8fe77aSChristian Borntraeger MACHINE_IS_VM ? "z/VM" : 2774b8fe77aSChristian Borntraeger MACHINE_IS_KVM ? "KVM" : "unknown"); 2784b8fe77aSChristian Borntraeger } 2792f8876f9SHeiko Carstens dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 2802f8876f9SHeiko Carstens } 2814b8fe77aSChristian Borntraeger 282fade4dc4SHeiko Carstens static __init void setup_topology(void) 283fade4dc4SHeiko Carstens { 284fade4dc4SHeiko Carstens int max_mnest; 285fade4dc4SHeiko Carstens 286fade4dc4SHeiko Carstens if (!test_facility(11)) 287fade4dc4SHeiko Carstens return; 288fade4dc4SHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 289fade4dc4SHeiko Carstens for (max_mnest = 6; max_mnest > 1; max_mnest--) { 290caf757c6SHeiko Carstens if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 291fade4dc4SHeiko Carstens break; 292fade4dc4SHeiko Carstens } 293fade4dc4SHeiko Carstens topology_max_mnest = max_mnest; 294fade4dc4SHeiko Carstens } 295fade4dc4SHeiko Carstens 296a3415703SMichael Holzheu static void early_pgm_check_handler(void) 297ab14de6cSHeiko Carstens { 298ab14de6cSHeiko Carstens const struct exception_table_entry *fixup; 29950be6345SPhilipp Hachtmann unsigned long cr0, cr0_new; 300eb608fb3SHeiko Carstens unsigned long addr; 301ab14de6cSHeiko Carstens 302ab14de6cSHeiko Carstens addr = S390_lowcore.program_old_psw.addr; 3039cb1ccecSHeiko Carstens fixup = search_exception_tables(addr); 304ab14de6cSHeiko Carstens if (!fixup) 305ab14de6cSHeiko Carstens disabled_wait(0); 30650be6345SPhilipp Hachtmann /* Disable low address protection before storing into lowcore. */ 30750be6345SPhilipp Hachtmann __ctl_store(cr0, 0, 0); 30850be6345SPhilipp Hachtmann cr0_new = cr0 & ~(1UL << 28); 30950be6345SPhilipp Hachtmann __ctl_load(cr0_new, 0, 0); 310fecc868aSHeiko Carstens S390_lowcore.program_old_psw.addr = extable_fixup(fixup); 31150be6345SPhilipp Hachtmann __ctl_load(cr0, 0, 0); 312ab14de6cSHeiko Carstens } 313ab14de6cSHeiko Carstens 3145f954c34SHeiko Carstens static noinline __init void setup_lowcore_early(void) 315ab14de6cSHeiko Carstens { 316ab14de6cSHeiko Carstens psw_t psw; 317ab14de6cSHeiko Carstens 318b50511e4SMartin Schwidefsky psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 319fecc868aSHeiko Carstens psw.addr = (unsigned long) s390_base_ext_handler; 320ab14de6cSHeiko Carstens S390_lowcore.external_new_psw = psw; 321fecc868aSHeiko Carstens psw.addr = (unsigned long) s390_base_pgm_handler; 322ab14de6cSHeiko Carstens S390_lowcore.program_new_psw = psw; 323ab14de6cSHeiko Carstens s390_base_pgm_handler_fn = early_pgm_check_handler; 324c360192bSMartin Schwidefsky S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 325ab14de6cSHeiko Carstens } 326ab14de6cSHeiko Carstens 32714375bc4SMartin Schwidefsky static noinline __init void setup_facility_list(void) 32814375bc4SMartin Schwidefsky { 3293ab121abSMichael Holzheu stfle(S390_lowcore.stfle_fac_list, 3303ab121abSMichael Holzheu ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 33114375bc4SMartin Schwidefsky } 33214375bc4SMartin Schwidefsky 3332e5061e4SHeiko Carstens static __init void detect_diag9c(void) 3342e5061e4SHeiko Carstens { 3352e5061e4SHeiko Carstens unsigned int cpu_address; 3362e5061e4SHeiko Carstens int rc; 3372e5061e4SHeiko Carstens 3382e5061e4SHeiko Carstens cpu_address = stap(); 3391ec2772eSMartin Schwidefsky diag_stat_inc(DIAG_STAT_X09C); 3402e5061e4SHeiko Carstens asm volatile( 3412e5061e4SHeiko Carstens " diag %2,0,0x9c\n" 3422e5061e4SHeiko Carstens "0: la %0,0\n" 3432e5061e4SHeiko Carstens "1:\n" 3442e5061e4SHeiko Carstens EX_TABLE(0b,1b) 3452e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 3462e5061e4SHeiko Carstens if (!rc) 347d3135e0cSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 3482e5061e4SHeiko Carstens } 3492e5061e4SHeiko Carstens 3502e5061e4SHeiko Carstens static __init void detect_diag44(void) 3512e5061e4SHeiko Carstens { 3522e5061e4SHeiko Carstens int rc; 3532e5061e4SHeiko Carstens 3541ec2772eSMartin Schwidefsky diag_stat_inc(DIAG_STAT_X044); 3552e5061e4SHeiko Carstens asm volatile( 3562e5061e4SHeiko Carstens " diag 0,0,0x44\n" 3572e5061e4SHeiko Carstens "0: la %0,0\n" 3582e5061e4SHeiko Carstens "1:\n" 3592e5061e4SHeiko Carstens EX_TABLE(0b,1b) 3602e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 3612e5061e4SHeiko Carstens if (!rc) 362d3135e0cSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 3632e5061e4SHeiko Carstens } 3642e5061e4SHeiko Carstens 3652e5061e4SHeiko Carstens static __init void detect_machine_facilities(void) 3662e5061e4SHeiko Carstens { 3673c7ef08bSHeiko Carstens if (test_facility(8)) { 3683c7ef08bSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 3693c7ef08bSHeiko Carstens __ctl_set_bit(0, 23); 3703c7ef08bSHeiko Carstens } 37185e9d0e5SHeiko Carstens if (test_facility(78)) 37285e9d0e5SHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 37314375bc4SMartin Schwidefsky if (test_facility(3)) 374d3135e0cSHeiko Carstens S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 37514375bc4SMartin Schwidefsky if (test_facility(40)) 37623d18e8dSHendrik Brueckner S390_lowcore.machine_flags |= MACHINE_FLAG_LPP; 377d35339a4SMartin Schwidefsky if (test_facility(50) && test_facility(73)) 378d35339a4SMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 3791b948d6cSMartin Schwidefsky if (test_facility(51)) 3801b948d6cSMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 381b5510d9bSHendrik Brueckner if (test_facility(129)) { 38280703617SMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 383b5510d9bSHendrik Brueckner __ctl_set_bit(0, 17); 3842e5061e4SHeiko Carstens } 38557d7f939SMartin Schwidefsky if (test_facility(130)) { 38657d7f939SMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 38757d7f939SMartin Schwidefsky __ctl_set_bit(0, 20); 38857d7f939SMartin Schwidefsky } 389916cda1aSMartin Schwidefsky if (test_facility(133)) 390916cda1aSMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 3916e2ef5e4SMartin Schwidefsky if (test_facility(139) && (tod_clock_base[1] & 0x80)) { 3926e2ef5e4SMartin Schwidefsky /* Enabled signed clock comparator comparisons */ 3936e2ef5e4SMartin Schwidefsky S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 3946e2ef5e4SMartin Schwidefsky clock_comparator_max = -1ULL >> 1; 3956e2ef5e4SMartin Schwidefsky __ctl_set_bit(0, 53); 3966e2ef5e4SMartin Schwidefsky } 397b5510d9bSHendrik Brueckner } 398b5510d9bSHendrik Brueckner 3991a36a39eSMartin Schwidefsky static inline void save_vector_registers(void) 4001a36a39eSMartin Schwidefsky { 4011a36a39eSMartin Schwidefsky #ifdef CONFIG_CRASH_DUMP 4021a36a39eSMartin Schwidefsky if (test_facility(129)) 4031a36a39eSMartin Schwidefsky save_vx_regs(boot_cpu_vector_save_area); 4041a36a39eSMartin Schwidefsky #endif 4051a36a39eSMartin Schwidefsky } 4061a36a39eSMartin Schwidefsky 40768cc795dSHeiko Carstens static int __init topology_setup(char *str) 40868cc795dSHeiko Carstens { 40968cc795dSHeiko Carstens bool enabled; 41068cc795dSHeiko Carstens int rc; 41168cc795dSHeiko Carstens 41268cc795dSHeiko Carstens rc = kstrtobool(str, &enabled); 41368cc795dSHeiko Carstens if (!rc && !enabled) 4144fd4dd8bSHeiko Carstens S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY; 41568cc795dSHeiko Carstens return rc; 41668cc795dSHeiko Carstens } 41768cc795dSHeiko Carstens early_param("topology", topology_setup); 41868cc795dSHeiko Carstens 419b5510d9bSHendrik Brueckner static int __init disable_vector_extension(char *str) 420b5510d9bSHendrik Brueckner { 421b5510d9bSHendrik Brueckner S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 422b5510d9bSHendrik Brueckner __ctl_clear_bit(0, 17); 423*673cfddfSHeiko Carstens return 0; 424b5510d9bSHendrik Brueckner } 425b5510d9bSHendrik Brueckner early_param("novx", disable_vector_extension); 4262e5061e4SHeiko Carstens 42757d7f939SMartin Schwidefsky static int __init noexec_setup(char *str) 42857d7f939SMartin Schwidefsky { 42957d7f939SMartin Schwidefsky bool enabled; 43057d7f939SMartin Schwidefsky int rc; 43157d7f939SMartin Schwidefsky 43257d7f939SMartin Schwidefsky rc = kstrtobool(str, &enabled); 43357d7f939SMartin Schwidefsky if (!rc && !enabled) { 43457d7f939SMartin Schwidefsky /* Disable no-execute support */ 43557d7f939SMartin Schwidefsky S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX; 43657d7f939SMartin Schwidefsky __ctl_clear_bit(0, 20); 43757d7f939SMartin Schwidefsky } 43857d7f939SMartin Schwidefsky return rc; 43957d7f939SMartin Schwidefsky } 44057d7f939SMartin Schwidefsky early_param("noexec", noexec_setup); 44157d7f939SMartin Schwidefsky 44261b0b016SMartin Schwidefsky static int __init cad_setup(char *str) 4432c72a44eSMartin Schwidefsky { 444b13de4b7SMartin Schwidefsky bool enabled; 445b13de4b7SMartin Schwidefsky int rc; 44661b0b016SMartin Schwidefsky 447b13de4b7SMartin Schwidefsky rc = kstrtobool(str, &enabled); 448b13de4b7SMartin Schwidefsky if (!rc && enabled && test_facility(128)) 4492c72a44eSMartin Schwidefsky /* Enable problem state CAD. */ 4502c72a44eSMartin Schwidefsky __ctl_set_bit(2, 3); 451b13de4b7SMartin Schwidefsky return rc; 4522c72a44eSMartin Schwidefsky } 453b13de4b7SMartin Schwidefsky early_param("cad", cad_setup); 4542c72a44eSMartin Schwidefsky 455d543a106SHeiko Carstens static __init void memmove_early(void *dst, const void *src, size_t n) 456d543a106SHeiko Carstens { 457d543a106SHeiko Carstens unsigned long addr; 458d543a106SHeiko Carstens long incr; 459d543a106SHeiko Carstens psw_t old; 460d543a106SHeiko Carstens 461d543a106SHeiko Carstens if (!n) 462d543a106SHeiko Carstens return; 463d543a106SHeiko Carstens incr = 1; 464d543a106SHeiko Carstens if (dst > src) { 465d543a106SHeiko Carstens incr = -incr; 466d543a106SHeiko Carstens dst += n - 1; 467d543a106SHeiko Carstens src += n - 1; 468d543a106SHeiko Carstens } 469d543a106SHeiko Carstens old = S390_lowcore.program_new_psw; 470d543a106SHeiko Carstens S390_lowcore.program_new_psw.mask = __extract_psw(); 471d543a106SHeiko Carstens asm volatile( 472d543a106SHeiko Carstens " larl %[addr],1f\n" 473d543a106SHeiko Carstens " stg %[addr],%[psw_pgm_addr]\n" 474d543a106SHeiko Carstens "0: mvc 0(1,%[dst]),0(%[src])\n" 475d543a106SHeiko Carstens " agr %[dst],%[incr]\n" 476d543a106SHeiko Carstens " agr %[src],%[incr]\n" 477d543a106SHeiko Carstens " brctg %[n],0b\n" 478d543a106SHeiko Carstens "1:\n" 479d543a106SHeiko Carstens : [addr] "=&d" (addr), 48075a35734SHeiko Carstens [psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr), 481d543a106SHeiko Carstens [dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n) 482d543a106SHeiko Carstens : [incr] "d" (incr) 483d543a106SHeiko Carstens : "cc", "memory"); 484d543a106SHeiko Carstens S390_lowcore.program_new_psw = old; 485d543a106SHeiko Carstens } 486d543a106SHeiko Carstens 487d543a106SHeiko Carstens static __init noinline void ipl_save_parameters(void) 488d543a106SHeiko Carstens { 489d543a106SHeiko Carstens void *src, *dst; 490d543a106SHeiko Carstens 491d543a106SHeiko Carstens src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr; 492d543a106SHeiko Carstens dst = (void *) IPL_PARMBLOCK_ORIGIN; 493d543a106SHeiko Carstens memmove_early(dst, src, PAGE_SIZE); 494d543a106SHeiko Carstens S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN; 495d543a106SHeiko Carstens } 496d543a106SHeiko Carstens 497d543a106SHeiko Carstens static __init noinline void rescue_initrd(void) 498761cdf6aSHeiko Carstens { 499761cdf6aSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 50027e7318cSHeiko Carstens unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 501761cdf6aSHeiko Carstens /* 50227e7318cSHeiko Carstens * Just like in case of IPL from VM reader we make sure there is a 50327e7318cSHeiko Carstens * gap of 4MB between end of kernel and start of initrd. 50427e7318cSHeiko Carstens * That way we can also be sure that saving an NSS will succeed, 50527e7318cSHeiko Carstens * which however only requires different segments. 506761cdf6aSHeiko Carstens */ 507761cdf6aSHeiko Carstens if (!INITRD_START || !INITRD_SIZE) 508761cdf6aSHeiko Carstens return; 50927e7318cSHeiko Carstens if (INITRD_START >= min_initrd_addr) 510761cdf6aSHeiko Carstens return; 511d543a106SHeiko Carstens memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 51227e7318cSHeiko Carstens INITRD_START = min_initrd_addr; 513761cdf6aSHeiko Carstens #endif 514761cdf6aSHeiko Carstens } 515761cdf6aSHeiko Carstens 516a0443fbbSHendrik Brueckner /* Set up boot command line */ 517684d2fd4SHendrik Brueckner static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 518684d2fd4SHendrik Brueckner { 519684d2fd4SHendrik Brueckner char *parm, *delim; 520684d2fd4SHendrik Brueckner size_t rc, len; 521684d2fd4SHendrik Brueckner 522684d2fd4SHendrik Brueckner len = strlen(boot_command_line); 523684d2fd4SHendrik Brueckner 524684d2fd4SHendrik Brueckner delim = boot_command_line + len; /* '\0' character position */ 525684d2fd4SHendrik Brueckner parm = boot_command_line + len + 1; /* append right after '\0' */ 526684d2fd4SHendrik Brueckner 527684d2fd4SHendrik Brueckner rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 528684d2fd4SHendrik Brueckner if (rc) { 529684d2fd4SHendrik Brueckner if (*parm == '=') 530684d2fd4SHendrik Brueckner memmove(boot_command_line, parm + 1, rc); 531684d2fd4SHendrik Brueckner else 532684d2fd4SHendrik Brueckner *delim = ' '; /* replace '\0' with space */ 533684d2fd4SHendrik Brueckner } 534684d2fd4SHendrik Brueckner } 535684d2fd4SHendrik Brueckner 5361fb81057SMichael Holzheu static inline int has_ebcdic_char(const char *str) 537a0443fbbSHendrik Brueckner { 53861fd330dSMartin Schwidefsky int i; 53961fd330dSMartin Schwidefsky 5401fb81057SMichael Holzheu for (i = 0; str[i]; i++) 5411fb81057SMichael Holzheu if (str[i] & 0x80) 5421fb81057SMichael Holzheu return 1; 5431fb81057SMichael Holzheu return 0; 5441fb81057SMichael Holzheu } 54561fd330dSMartin Schwidefsky 5461fb81057SMichael Holzheu static void __init setup_boot_command_line(void) 5471fb81057SMichael Holzheu { 5481fb81057SMichael Holzheu COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 5491fb81057SMichael Holzheu /* convert arch command line to ascii if necessary */ 5501fb81057SMichael Holzheu if (has_ebcdic_char(COMMAND_LINE)) 5511fb81057SMichael Holzheu EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 552a0443fbbSHendrik Brueckner /* copy arch command line */ 55361fd330dSMartin Schwidefsky strlcpy(boot_command_line, strstrip(COMMAND_LINE), 55461fd330dSMartin Schwidefsky ARCH_COMMAND_LINE_SIZE); 555a0443fbbSHendrik Brueckner 556a0443fbbSHendrik Brueckner /* append IPL PARM data to the boot command line */ 557684d2fd4SHendrik Brueckner if (MACHINE_IS_VM) 558684d2fd4SHendrik Brueckner append_to_cmdline(append_ipl_vmparm); 559684d2fd4SHendrik Brueckner 560684d2fd4SHendrik Brueckner append_to_cmdline(append_ipl_scpdata); 561a0443fbbSHendrik Brueckner } 562a0443fbbSHendrik Brueckner 563ab14de6cSHeiko Carstens /* 564ab14de6cSHeiko Carstens * Save ipl parameters, clear bss memory, initialize storage keys 565ab14de6cSHeiko Carstens * and create a kernel NSS at startup if the SAVESYS= parm is defined 566ab14de6cSHeiko Carstens */ 567ab14de6cSHeiko Carstens void __init startup_init(void) 568ab14de6cSHeiko Carstens { 569b6112ccbSMartin Schwidefsky reset_tod_clock(); 570ab14de6cSHeiko Carstens ipl_save_parameters(); 571761cdf6aSHeiko Carstens rescue_initrd(); 572ab14de6cSHeiko Carstens clear_bss_section(); 573d543a106SHeiko Carstens ipl_verify_parameters(); 574b1c0854dSMartin Schwidefsky time_early_init(); 575ab14de6cSHeiko Carstens init_kernel_storage_key(); 576ab14de6cSHeiko Carstens lockdep_off(); 577ab14de6cSHeiko Carstens setup_lowcore_early(); 57814375bc4SMartin Schwidefsky setup_facility_list(); 579a0443fbbSHendrik Brueckner detect_machine_type(); 5804b8fe77aSChristian Borntraeger setup_arch_string(); 581a0443fbbSHendrik Brueckner ipl_update_parameters(); 582a0443fbbSHendrik Brueckner setup_boot_command_line(); 583a0443fbbSHendrik Brueckner create_kernel_nss(); 5842e5061e4SHeiko Carstens detect_diag9c(); 5852e5061e4SHeiko Carstens detect_diag44(); 5862e5061e4SHeiko Carstens detect_machine_facilities(); 5871a36a39eSMartin Schwidefsky save_vector_registers(); 588fade4dc4SHeiko Carstens setup_topology(); 5897b50da53SMichael Holzheu sclp_early_detect(); 590ab14de6cSHeiko Carstens lockdep_on(); 591ab14de6cSHeiko Carstens } 592