1ab14de6cSHeiko Carstens /* 2ab14de6cSHeiko Carstens * arch/s390/kernel/early.c 3ab14de6cSHeiko Carstens * 4ab14de6cSHeiko Carstens * Copyright IBM Corp. 2007 5ab14de6cSHeiko Carstens * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 6ab14de6cSHeiko Carstens * Heiko Carstens <heiko.carstens@de.ibm.com> 7ab14de6cSHeiko Carstens */ 8ab14de6cSHeiko Carstens 992e6ecf3SChristian Borntraeger #include <linux/compiler.h> 10ab14de6cSHeiko Carstens #include <linux/init.h> 11ab14de6cSHeiko Carstens #include <linux/errno.h> 12ab14de6cSHeiko Carstens #include <linux/string.h> 13ab14de6cSHeiko Carstens #include <linux/ctype.h> 14*dfd9f7abSHeiko Carstens #include <linux/ftrace.h> 15ab14de6cSHeiko Carstens #include <linux/lockdep.h> 16ab14de6cSHeiko Carstens #include <linux/module.h> 17ab14de6cSHeiko Carstens #include <linux/pfn.h> 18ab14de6cSHeiko Carstens #include <linux/uaccess.h> 19a0443fbbSHendrik Brueckner #include <asm/ebcdic.h> 2046b05d26SMichael Holzheu #include <asm/ipl.h> 21ab14de6cSHeiko Carstens #include <asm/lowcore.h> 22ab14de6cSHeiko Carstens #include <asm/processor.h> 23ab14de6cSHeiko Carstens #include <asm/sections.h> 24ab14de6cSHeiko Carstens #include <asm/setup.h> 2592e6ecf3SChristian Borntraeger #include <asm/sysinfo.h> 26ab14de6cSHeiko Carstens #include <asm/cpcmd.h> 27ab14de6cSHeiko Carstens #include <asm/sclp.h> 28a806170eSHeiko Carstens #include "entry.h" 29ab14de6cSHeiko Carstens 30ab14de6cSHeiko Carstens /* 31ab14de6cSHeiko Carstens * Create a Kernel NSS if the SAVESYS= parameter is defined 32ab14de6cSHeiko Carstens */ 33a0443fbbSHendrik Brueckner #define DEFSYS_CMD_SIZE 128 34ab14de6cSHeiko Carstens #define SAVESYS_CMD_SIZE 32 35ab14de6cSHeiko Carstens 36ab14de6cSHeiko Carstens char kernel_nss_name[NSS_NAME_SIZE + 1]; 37ab14de6cSHeiko Carstens 3825097bf1SChristian Ehrhardt static unsigned long machine_flags; 3925097bf1SChristian Ehrhardt 40a0443fbbSHendrik Brueckner static void __init setup_boot_command_line(void); 41a0443fbbSHendrik Brueckner 42b6112ccbSMartin Schwidefsky /* 43b6112ccbSMartin Schwidefsky * Get the TOD clock running. 44b6112ccbSMartin Schwidefsky */ 45b6112ccbSMartin Schwidefsky static void __init reset_tod_clock(void) 46b6112ccbSMartin Schwidefsky { 47b6112ccbSMartin Schwidefsky u64 time; 48b6112ccbSMartin Schwidefsky 49b6112ccbSMartin Schwidefsky if (store_clock(&time) == 0) 50b6112ccbSMartin Schwidefsky return; 51b6112ccbSMartin Schwidefsky /* TOD clock not running. Set the clock to Unix Epoch. */ 52b6112ccbSMartin Schwidefsky if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) 53b6112ccbSMartin Schwidefsky disabled_wait(0); 54b6112ccbSMartin Schwidefsky 55b6112ccbSMartin Schwidefsky sched_clock_base_cc = TOD_UNIX_EPOCH; 56b6112ccbSMartin Schwidefsky } 57a0443fbbSHendrik Brueckner 58ab14de6cSHeiko Carstens #ifdef CONFIG_SHARED_KERNEL 59a0443fbbSHendrik Brueckner int __init savesys_ipl_nss(char *cmd, const int cmdlen); 60a0443fbbSHendrik Brueckner 61a0443fbbSHendrik Brueckner asm( 62a0443fbbSHendrik Brueckner " .section .init.text,\"ax\",@progbits\n" 63a0443fbbSHendrik Brueckner " .align 4\n" 64a0443fbbSHendrik Brueckner " .type savesys_ipl_nss, @function\n" 65a0443fbbSHendrik Brueckner "savesys_ipl_nss:\n" 66a0443fbbSHendrik Brueckner #ifdef CONFIG_64BIT 67a0443fbbSHendrik Brueckner " stmg 6,15,48(15)\n" 68a0443fbbSHendrik Brueckner " lgr 14,3\n" 69a0443fbbSHendrik Brueckner " sam31\n" 70a0443fbbSHendrik Brueckner " diag 2,14,0x8\n" 71a0443fbbSHendrik Brueckner " sam64\n" 72a0443fbbSHendrik Brueckner " lgr 2,14\n" 73a0443fbbSHendrik Brueckner " lmg 6,15,48(15)\n" 74a0443fbbSHendrik Brueckner #else 75a0443fbbSHendrik Brueckner " stm 6,15,24(15)\n" 76a0443fbbSHendrik Brueckner " lr 14,3\n" 77a0443fbbSHendrik Brueckner " diag 2,14,0x8\n" 78a0443fbbSHendrik Brueckner " lr 2,14\n" 79a0443fbbSHendrik Brueckner " lm 6,15,24(15)\n" 80a0443fbbSHendrik Brueckner #endif 81a0443fbbSHendrik Brueckner " br 14\n" 82a0443fbbSHendrik Brueckner " .size savesys_ipl_nss, .-savesys_ipl_nss\n"); 83a0443fbbSHendrik Brueckner 84ab14de6cSHeiko Carstens static noinline __init void create_kernel_nss(void) 85ab14de6cSHeiko Carstens { 86ab14de6cSHeiko Carstens unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 87ab14de6cSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 88ab14de6cSHeiko Carstens unsigned int sinitrd_pfn, einitrd_pfn; 89ab14de6cSHeiko Carstens #endif 90ab14de6cSHeiko Carstens int response; 91a0443fbbSHendrik Brueckner size_t len; 92ab14de6cSHeiko Carstens char *savesys_ptr; 93ab14de6cSHeiko Carstens char upper_command_line[COMMAND_LINE_SIZE]; 94ab14de6cSHeiko Carstens char defsys_cmd[DEFSYS_CMD_SIZE]; 95ab14de6cSHeiko Carstens char savesys_cmd[SAVESYS_CMD_SIZE]; 96ab14de6cSHeiko Carstens 97ab14de6cSHeiko Carstens /* Do nothing if we are not running under VM */ 98ab14de6cSHeiko Carstens if (!MACHINE_IS_VM) 99ab14de6cSHeiko Carstens return; 100ab14de6cSHeiko Carstens 101ab14de6cSHeiko Carstens /* Convert COMMAND_LINE to upper case */ 102a0443fbbSHendrik Brueckner for (i = 0; i < strlen(boot_command_line); i++) 103a0443fbbSHendrik Brueckner upper_command_line[i] = toupper(boot_command_line[i]); 104ab14de6cSHeiko Carstens 105ab14de6cSHeiko Carstens savesys_ptr = strstr(upper_command_line, "SAVESYS="); 106ab14de6cSHeiko Carstens 107ab14de6cSHeiko Carstens if (!savesys_ptr) 108ab14de6cSHeiko Carstens return; 109ab14de6cSHeiko Carstens 110ab14de6cSHeiko Carstens savesys_ptr += 8; /* Point to the beginning of the NSS name */ 111ab14de6cSHeiko Carstens for (i = 0; i < NSS_NAME_SIZE; i++) { 112ab14de6cSHeiko Carstens if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 113ab14de6cSHeiko Carstens break; 114ab14de6cSHeiko Carstens kernel_nss_name[i] = savesys_ptr[i]; 115ab14de6cSHeiko Carstens } 116ab14de6cSHeiko Carstens 117ab14de6cSHeiko Carstens stext_pfn = PFN_DOWN(__pa(&_stext)); 118ab14de6cSHeiko Carstens eshared_pfn = PFN_DOWN(__pa(&_eshared)); 119ab14de6cSHeiko Carstens end_pfn = PFN_UP(__pa(&_end)); 120ab14de6cSHeiko Carstens min_size = end_pfn << 2; 121ab14de6cSHeiko Carstens 122ab14de6cSHeiko Carstens sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 123ab14de6cSHeiko Carstens kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, 124ab14de6cSHeiko Carstens eshared_pfn, end_pfn); 125ab14de6cSHeiko Carstens 126ab14de6cSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 127ab14de6cSHeiko Carstens if (INITRD_START && INITRD_SIZE) { 128ab14de6cSHeiko Carstens sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 129ab14de6cSHeiko Carstens einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 130ab14de6cSHeiko Carstens min_size = einitrd_pfn << 2; 131ab14de6cSHeiko Carstens sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, 132ab14de6cSHeiko Carstens sinitrd_pfn, einitrd_pfn); 133ab14de6cSHeiko Carstens } 134ab14de6cSHeiko Carstens #endif 135ab14de6cSHeiko Carstens 136a0443fbbSHendrik Brueckner sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", 137a0443fbbSHendrik Brueckner defsys_cmd, min_size); 138ab14de6cSHeiko Carstens sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", 139ab14de6cSHeiko Carstens kernel_nss_name, kernel_nss_name); 140ab14de6cSHeiko Carstens 141ab14de6cSHeiko Carstens __cpcmd(defsys_cmd, NULL, 0, &response); 142ab14de6cSHeiko Carstens 143583b33bcSHongjie Yang if (response != 0) { 144583b33bcSHongjie Yang kernel_nss_name[0] = '\0'; 145ab14de6cSHeiko Carstens return; 146583b33bcSHongjie Yang } 147ab14de6cSHeiko Carstens 148a0443fbbSHendrik Brueckner len = strlen(savesys_cmd); 149a0443fbbSHendrik Brueckner ASCEBC(savesys_cmd, len); 150a0443fbbSHendrik Brueckner response = savesys_ipl_nss(savesys_cmd, len); 151ab14de6cSHeiko Carstens 152a0443fbbSHendrik Brueckner /* On success: response is equal to the command size, 153a0443fbbSHendrik Brueckner * max SAVESYS_CMD_SIZE 154a0443fbbSHendrik Brueckner * On error: response contains the numeric portion of cp error message. 155a0443fbbSHendrik Brueckner * for SAVESYS it will be >= 263 156a0443fbbSHendrik Brueckner */ 157a0443fbbSHendrik Brueckner if (response > SAVESYS_CMD_SIZE) { 158583b33bcSHongjie Yang kernel_nss_name[0] = '\0'; 159ab14de6cSHeiko Carstens return; 160583b33bcSHongjie Yang } 161ab14de6cSHeiko Carstens 162a0443fbbSHendrik Brueckner /* re-setup boot command line with new ipl vm parms */ 163a0443fbbSHendrik Brueckner ipl_update_parameters(); 164a0443fbbSHendrik Brueckner setup_boot_command_line(); 165a0443fbbSHendrik Brueckner 166ab14de6cSHeiko Carstens ipl_flags = IPL_NSS_VALID; 167ab14de6cSHeiko Carstens } 168ab14de6cSHeiko Carstens 169ab14de6cSHeiko Carstens #else /* CONFIG_SHARED_KERNEL */ 170ab14de6cSHeiko Carstens 171ab14de6cSHeiko Carstens static inline void create_kernel_nss(void) { } 172ab14de6cSHeiko Carstens 173ab14de6cSHeiko Carstens #endif /* CONFIG_SHARED_KERNEL */ 174ab14de6cSHeiko Carstens 175ab14de6cSHeiko Carstens /* 176ab14de6cSHeiko Carstens * Clear bss memory 177ab14de6cSHeiko Carstens */ 178ab14de6cSHeiko Carstens static noinline __init void clear_bss_section(void) 179ab14de6cSHeiko Carstens { 180229d9c6dSHeiko Carstens memset(__bss_start, 0, __bss_stop - __bss_start); 181ab14de6cSHeiko Carstens } 182ab14de6cSHeiko Carstens 183ab14de6cSHeiko Carstens /* 184ab14de6cSHeiko Carstens * Initialize storage key for kernel pages 185ab14de6cSHeiko Carstens */ 186ab14de6cSHeiko Carstens static noinline __init void init_kernel_storage_key(void) 187ab14de6cSHeiko Carstens { 188ab14de6cSHeiko Carstens unsigned long end_pfn, init_pfn; 189ab14de6cSHeiko Carstens 190ab14de6cSHeiko Carstens end_pfn = PFN_UP(__pa(&_end)); 191ab14de6cSHeiko Carstens 192ab14de6cSHeiko Carstens for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 193ab14de6cSHeiko Carstens page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); 194ab14de6cSHeiko Carstens } 195ab14de6cSHeiko Carstens 19692e6ecf3SChristian Borntraeger static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 19792e6ecf3SChristian Borntraeger 198ab14de6cSHeiko Carstens static noinline __init void detect_machine_type(void) 199ab14de6cSHeiko Carstens { 20092e6ecf3SChristian Borntraeger /* No VM information? Looks like LPAR */ 20192e6ecf3SChristian Borntraeger if (stsi(&vmms, 3, 2, 2) == -ENOSYS) 20292e6ecf3SChristian Borntraeger return; 20392e6ecf3SChristian Borntraeger if (!vmms.count) 20492e6ecf3SChristian Borntraeger return; 205ab14de6cSHeiko Carstens 20692e6ecf3SChristian Borntraeger /* Running under KVM? If not we assume z/VM */ 20792e6ecf3SChristian Borntraeger if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 2082e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_KVM; 20992e6ecf3SChristian Borntraeger else 21092e6ecf3SChristian Borntraeger machine_flags |= MACHINE_FLAG_VM; 211ab14de6cSHeiko Carstens } 212ab14de6cSHeiko Carstens 213ab14de6cSHeiko Carstens static __init void early_pgm_check_handler(void) 214ab14de6cSHeiko Carstens { 215ab14de6cSHeiko Carstens unsigned long addr; 216ab14de6cSHeiko Carstens const struct exception_table_entry *fixup; 217ab14de6cSHeiko Carstens 218ab14de6cSHeiko Carstens addr = S390_lowcore.program_old_psw.addr; 219ab14de6cSHeiko Carstens fixup = search_exception_tables(addr & PSW_ADDR_INSN); 220ab14de6cSHeiko Carstens if (!fixup) 221ab14de6cSHeiko Carstens disabled_wait(0); 222ab14de6cSHeiko Carstens S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 223ab14de6cSHeiko Carstens } 224ab14de6cSHeiko Carstens 225ab14de6cSHeiko Carstens static noinline __init void setup_lowcore_early(void) 226ab14de6cSHeiko Carstens { 227ab14de6cSHeiko Carstens psw_t psw; 228ab14de6cSHeiko Carstens 229ab14de6cSHeiko Carstens psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 230ab14de6cSHeiko Carstens psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 231ab14de6cSHeiko Carstens S390_lowcore.external_new_psw = psw; 232ab14de6cSHeiko Carstens psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 233ab14de6cSHeiko Carstens S390_lowcore.program_new_psw = psw; 234ab14de6cSHeiko Carstens s390_base_pgm_handler_fn = early_pgm_check_handler; 235ab14de6cSHeiko Carstens } 236ab14de6cSHeiko Carstens 23753492b1dSGerald Schaefer static noinline __init void setup_hpage(void) 23853492b1dSGerald Schaefer { 23953492b1dSGerald Schaefer #ifndef CONFIG_DEBUG_PAGEALLOC 24053492b1dSGerald Schaefer unsigned int facilities; 24153492b1dSGerald Schaefer 24253492b1dSGerald Schaefer facilities = stfl(); 24353492b1dSGerald Schaefer if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 24453492b1dSGerald Schaefer return; 24553492b1dSGerald Schaefer machine_flags |= MACHINE_FLAG_HPAGE; 24653492b1dSGerald Schaefer __ctl_set_bit(0, 23); 24753492b1dSGerald Schaefer #endif 24853492b1dSGerald Schaefer } 24953492b1dSGerald Schaefer 2502e5061e4SHeiko Carstens static __init void detect_mvpg(void) 2512e5061e4SHeiko Carstens { 2522e5061e4SHeiko Carstens #ifndef CONFIG_64BIT 2532e5061e4SHeiko Carstens int rc; 2542e5061e4SHeiko Carstens 2552e5061e4SHeiko Carstens asm volatile( 2562e5061e4SHeiko Carstens " la 0,0\n" 2572e5061e4SHeiko Carstens " mvpg %2,%2\n" 2582e5061e4SHeiko Carstens "0: la %0,0\n" 2592e5061e4SHeiko Carstens "1:\n" 2602e5061e4SHeiko Carstens EX_TABLE(0b,1b) 2612e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 2622e5061e4SHeiko Carstens if (!rc) 2632e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_MVPG; 2642e5061e4SHeiko Carstens #endif 2652e5061e4SHeiko Carstens } 2662e5061e4SHeiko Carstens 2672e5061e4SHeiko Carstens static __init void detect_ieee(void) 2682e5061e4SHeiko Carstens { 2692e5061e4SHeiko Carstens #ifndef CONFIG_64BIT 2702e5061e4SHeiko Carstens int rc, tmp; 2712e5061e4SHeiko Carstens 2722e5061e4SHeiko Carstens asm volatile( 2732e5061e4SHeiko Carstens " efpc %1,0\n" 2742e5061e4SHeiko Carstens "0: la %0,0\n" 2752e5061e4SHeiko Carstens "1:\n" 2762e5061e4SHeiko Carstens EX_TABLE(0b,1b) 2772e5061e4SHeiko Carstens : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 2782e5061e4SHeiko Carstens if (!rc) 2792e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_IEEE; 2802e5061e4SHeiko Carstens #endif 2812e5061e4SHeiko Carstens } 2822e5061e4SHeiko Carstens 2832e5061e4SHeiko Carstens static __init void detect_csp(void) 2842e5061e4SHeiko Carstens { 2852e5061e4SHeiko Carstens #ifndef CONFIG_64BIT 2862e5061e4SHeiko Carstens int rc; 2872e5061e4SHeiko Carstens 2882e5061e4SHeiko Carstens asm volatile( 2892e5061e4SHeiko Carstens " la 0,0\n" 2902e5061e4SHeiko Carstens " la 1,0\n" 2912e5061e4SHeiko Carstens " la 2,4\n" 2922e5061e4SHeiko Carstens " csp 0,2\n" 2932e5061e4SHeiko Carstens "0: la %0,0\n" 2942e5061e4SHeiko Carstens "1:\n" 2952e5061e4SHeiko Carstens EX_TABLE(0b,1b) 2962e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 2972e5061e4SHeiko Carstens if (!rc) 2982e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_CSP; 2992e5061e4SHeiko Carstens #endif 3002e5061e4SHeiko Carstens } 3012e5061e4SHeiko Carstens 3022e5061e4SHeiko Carstens static __init void detect_diag9c(void) 3032e5061e4SHeiko Carstens { 3042e5061e4SHeiko Carstens unsigned int cpu_address; 3052e5061e4SHeiko Carstens int rc; 3062e5061e4SHeiko Carstens 3072e5061e4SHeiko Carstens cpu_address = stap(); 3082e5061e4SHeiko Carstens asm volatile( 3092e5061e4SHeiko Carstens " diag %2,0,0x9c\n" 3102e5061e4SHeiko Carstens "0: la %0,0\n" 3112e5061e4SHeiko Carstens "1:\n" 3122e5061e4SHeiko Carstens EX_TABLE(0b,1b) 3132e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 3142e5061e4SHeiko Carstens if (!rc) 3152e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_DIAG9C; 3162e5061e4SHeiko Carstens } 3172e5061e4SHeiko Carstens 3182e5061e4SHeiko Carstens static __init void detect_diag44(void) 3192e5061e4SHeiko Carstens { 3202e5061e4SHeiko Carstens #ifdef CONFIG_64BIT 3212e5061e4SHeiko Carstens int rc; 3222e5061e4SHeiko Carstens 3232e5061e4SHeiko Carstens asm volatile( 3242e5061e4SHeiko Carstens " diag 0,0,0x44\n" 3252e5061e4SHeiko Carstens "0: la %0,0\n" 3262e5061e4SHeiko Carstens "1:\n" 3272e5061e4SHeiko Carstens EX_TABLE(0b,1b) 3282e5061e4SHeiko Carstens : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 3292e5061e4SHeiko Carstens if (!rc) 3302e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_DIAG44; 3312e5061e4SHeiko Carstens #endif 3322e5061e4SHeiko Carstens } 3332e5061e4SHeiko Carstens 3342e5061e4SHeiko Carstens static __init void detect_machine_facilities(void) 3352e5061e4SHeiko Carstens { 3362e5061e4SHeiko Carstens #ifdef CONFIG_64BIT 3372e5061e4SHeiko Carstens unsigned int facilities; 3382e5061e4SHeiko Carstens 3392e5061e4SHeiko Carstens facilities = stfl(); 3402e5061e4SHeiko Carstens if (facilities & (1 << 28)) 3412e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_IDTE; 34253492b1dSGerald Schaefer if (facilities & (1 << 23)) 34353492b1dSGerald Schaefer machine_flags |= MACHINE_FLAG_PFMF; 3442e5061e4SHeiko Carstens if (facilities & (1 << 4)) 3452e5061e4SHeiko Carstens machine_flags |= MACHINE_FLAG_MVCOS; 3462e5061e4SHeiko Carstens #endif 3472e5061e4SHeiko Carstens } 3482e5061e4SHeiko Carstens 349761cdf6aSHeiko Carstens static __init void rescue_initrd(void) 350761cdf6aSHeiko Carstens { 351761cdf6aSHeiko Carstens #ifdef CONFIG_BLK_DEV_INITRD 352761cdf6aSHeiko Carstens /* 353761cdf6aSHeiko Carstens * Move the initrd right behind the bss section in case it starts 354761cdf6aSHeiko Carstens * within the bss section. So we don't overwrite it when the bss 355761cdf6aSHeiko Carstens * section gets cleared. 356761cdf6aSHeiko Carstens */ 357761cdf6aSHeiko Carstens if (!INITRD_START || !INITRD_SIZE) 358761cdf6aSHeiko Carstens return; 359761cdf6aSHeiko Carstens if (INITRD_START >= (unsigned long) __bss_stop) 360761cdf6aSHeiko Carstens return; 361761cdf6aSHeiko Carstens memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 362761cdf6aSHeiko Carstens INITRD_START = (unsigned long) __bss_stop; 363761cdf6aSHeiko Carstens #endif 364761cdf6aSHeiko Carstens } 365761cdf6aSHeiko Carstens 366a0443fbbSHendrik Brueckner /* Set up boot command line */ 367a0443fbbSHendrik Brueckner static void __init setup_boot_command_line(void) 368a0443fbbSHendrik Brueckner { 369a0443fbbSHendrik Brueckner char *parm = NULL; 370a0443fbbSHendrik Brueckner 371a0443fbbSHendrik Brueckner /* copy arch command line */ 372a0443fbbSHendrik Brueckner strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 373a0443fbbSHendrik Brueckner 374a0443fbbSHendrik Brueckner /* append IPL PARM data to the boot command line */ 375a0443fbbSHendrik Brueckner if (MACHINE_IS_VM) { 376a0443fbbSHendrik Brueckner parm = boot_command_line + strlen(boot_command_line); 377a0443fbbSHendrik Brueckner *parm++ = ' '; 378a0443fbbSHendrik Brueckner get_ipl_vmparm(parm); 379a0443fbbSHendrik Brueckner if (parm[0] == '=') 380a0443fbbSHendrik Brueckner memmove(boot_command_line, parm + 1, strlen(parm)); 381a0443fbbSHendrik Brueckner } 382a0443fbbSHendrik Brueckner } 383a0443fbbSHendrik Brueckner 384a0443fbbSHendrik Brueckner 385ab14de6cSHeiko Carstens /* 386ab14de6cSHeiko Carstens * Save ipl parameters, clear bss memory, initialize storage keys 387ab14de6cSHeiko Carstens * and create a kernel NSS at startup if the SAVESYS= parm is defined 388ab14de6cSHeiko Carstens */ 389ab14de6cSHeiko Carstens void __init startup_init(void) 390ab14de6cSHeiko Carstens { 391b6112ccbSMartin Schwidefsky reset_tod_clock(); 392ab14de6cSHeiko Carstens ipl_save_parameters(); 393761cdf6aSHeiko Carstens rescue_initrd(); 394ab14de6cSHeiko Carstens clear_bss_section(); 395ab14de6cSHeiko Carstens init_kernel_storage_key(); 396ab14de6cSHeiko Carstens lockdep_init(); 397ab14de6cSHeiko Carstens lockdep_off(); 398ab14de6cSHeiko Carstens sort_main_extable(); 399ab14de6cSHeiko Carstens setup_lowcore_early(); 400a0443fbbSHendrik Brueckner detect_machine_type(); 401a0443fbbSHendrik Brueckner ipl_update_parameters(); 402a0443fbbSHendrik Brueckner setup_boot_command_line(); 403a0443fbbSHendrik Brueckner create_kernel_nss(); 4042e5061e4SHeiko Carstens detect_mvpg(); 4052e5061e4SHeiko Carstens detect_ieee(); 4062e5061e4SHeiko Carstens detect_csp(); 4072e5061e4SHeiko Carstens detect_diag9c(); 4082e5061e4SHeiko Carstens detect_diag44(); 4092e5061e4SHeiko Carstens detect_machine_facilities(); 41053492b1dSGerald Schaefer setup_hpage(); 41183119ad4SHeiko Carstens sclp_facilities_detect(); 41223d17421SHeiko Carstens detect_memory_layout(memory_chunk); 41325097bf1SChristian Ehrhardt S390_lowcore.machine_flags = machine_flags; 414*dfd9f7abSHeiko Carstens #ifdef CONFIG_DYNAMIC_FTRACE 415*dfd9f7abSHeiko Carstens S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 416*dfd9f7abSHeiko Carstens #endif 417ab14de6cSHeiko Carstens lockdep_on(); 418ab14de6cSHeiko Carstens } 419