| /* |
| * arch/s390/kernel/early.c |
| * |
| * Copyright IBM Corp. 2007, 2009 |
| * Author(s): Hongjie Yang <hongjie@us.ibm.com>, |
| * Heiko Carstens <heiko.carstens@de.ibm.com> |
| */ |
| |
| #define KMSG_COMPONENT "setup" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/compiler.h> |
| #include <linux/init.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/ctype.h> |
| #include <linux/ftrace.h> |
| #include <linux/lockdep.h> |
| #include <linux/module.h> |
| #include <linux/pfn.h> |
| #include <linux/uaccess.h> |
| #include <linux/kernel.h> |
| #include <asm/ebcdic.h> |
| #include <asm/ipl.h> |
| #include <asm/lowcore.h> |
| #include <asm/processor.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/sysinfo.h> |
| #include <asm/cpcmd.h> |
| #include <asm/sclp.h> |
| #include <asm/facility.h> |
| #include "entry.h" |
| |
| /* |
| * Create a Kernel NSS if the SAVESYS= parameter is defined |
| */ |
| #define DEFSYS_CMD_SIZE 128 |
| #define SAVESYS_CMD_SIZE 32 |
| |
| char kernel_nss_name[NSS_NAME_SIZE + 1]; |
| |
| static void __init setup_boot_command_line(void); |
| |
| /* |
| * Get the TOD clock running. |
| */ |
| static void __init reset_tod_clock(void) |
| { |
| u64 time; |
| |
| if (store_clock(&time) == 0) |
| return; |
| /* TOD clock not running. Set the clock to Unix Epoch. */ |
| if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) |
| disabled_wait(0); |
| |
| sched_clock_base_cc = TOD_UNIX_EPOCH; |
| S390_lowcore.last_update_clock = sched_clock_base_cc; |
| } |
| |
| #ifdef CONFIG_SHARED_KERNEL |
| int __init savesys_ipl_nss(char *cmd, const int cmdlen); |
| |
| asm( |
| " .section .init.text,\"ax\",@progbits\n" |
| " .align 4\n" |
| " .type savesys_ipl_nss, @function\n" |
| "savesys_ipl_nss:\n" |
| #ifdef CONFIG_64BIT |
| " stmg 6,15,48(15)\n" |
| " lgr 14,3\n" |
| " sam31\n" |
| " diag 2,14,0x8\n" |
| " sam64\n" |
| " lgr 2,14\n" |
| " lmg 6,15,48(15)\n" |
| #else |
| " stm 6,15,24(15)\n" |
| " lr 14,3\n" |
| " diag 2,14,0x8\n" |
| " lr 2,14\n" |
| " lm 6,15,24(15)\n" |
| #endif |
| " br 14\n" |
| " .size savesys_ipl_nss, .-savesys_ipl_nss\n" |
| " .previous\n"); |
| |
| static __initdata char upper_command_line[COMMAND_LINE_SIZE]; |
| |
| static noinline __init void create_kernel_nss(void) |
| { |
| unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; |
| #ifdef CONFIG_BLK_DEV_INITRD |
| unsigned int sinitrd_pfn, einitrd_pfn; |
| #endif |
| int response; |
| int hlen; |
| size_t len; |
| char *savesys_ptr; |
| char defsys_cmd[DEFSYS_CMD_SIZE]; |
| char savesys_cmd[SAVESYS_CMD_SIZE]; |
| |
| /* Do nothing if we are not running under VM */ |
| if (!MACHINE_IS_VM) |
| return; |
| |
| /* Convert COMMAND_LINE to upper case */ |
| for (i = 0; i < strlen(boot_command_line); i++) |
| upper_command_line[i] = toupper(boot_command_line[i]); |
| |
| savesys_ptr = strstr(upper_command_line, "SAVESYS="); |
| |
| if (!savesys_ptr) |
| return; |
| |
| savesys_ptr += 8; /* Point to the beginning of the NSS name */ |
| for (i = 0; i < NSS_NAME_SIZE; i++) { |
| if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') |
| break; |
| kernel_nss_name[i] = savesys_ptr[i]; |
| } |
| |
| stext_pfn = PFN_DOWN(__pa(&_stext)); |
| eshared_pfn = PFN_DOWN(__pa(&_eshared)); |
| end_pfn = PFN_UP(__pa(&_end)); |
| min_size = end_pfn << 2; |
| |
| hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, |
| "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", |
| kernel_nss_name, stext_pfn - 1, stext_pfn, |
| eshared_pfn - 1, eshared_pfn, end_pfn); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| if (INITRD_START && INITRD_SIZE) { |
| sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); |
| einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); |
| min_size = einitrd_pfn << 2; |
| hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, |
| " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); |
| } |
| #endif |
| |
| snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, |
| " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); |
| defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; |
| snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", |
| kernel_nss_name, kernel_nss_name); |
| savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; |
| |
| __cpcmd(defsys_cmd, NULL, 0, &response); |
| |
| if (response != 0) { |
| pr_err("Defining the Linux kernel NSS failed with rc=%d\n", |
| response); |
| kernel_nss_name[0] = '\0'; |
| return; |
| } |
| |
| len = strlen(savesys_cmd); |
| ASCEBC(savesys_cmd, len); |
| response = savesys_ipl_nss(savesys_cmd, len); |
| |
| /* On success: response is equal to the command size, |
| * max SAVESYS_CMD_SIZE |
| * On error: response contains the numeric portion of cp error message. |
| * for SAVESYS it will be >= 263 |
| * for missing privilege class, it will be 1 |
| */ |
| if (response > SAVESYS_CMD_SIZE || response == 1) { |
| pr_err("Saving the Linux kernel NSS failed with rc=%d\n", |
| response); |
| kernel_nss_name[0] = '\0'; |
| return; |
| } |
| |
| /* re-initialize cputime accounting. */ |
| sched_clock_base_cc = get_clock(); |
| S390_lowcore.last_update_clock = sched_clock_base_cc; |
| S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; |
| S390_lowcore.user_timer = 0; |
| S390_lowcore.system_timer = 0; |
| asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); |
| |
| /* re-setup boot command line with new ipl vm parms */ |
| ipl_update_parameters(); |
| setup_boot_command_line(); |
| |
| ipl_flags = IPL_NSS_VALID; |
| } |
| |
| #else /* CONFIG_SHARED_KERNEL */ |
| |
| static inline void create_kernel_nss(void) { } |
| |
| #endif /* CONFIG_SHARED_KERNEL */ |
| |
| /* |
| * Clear bss memory |
| */ |
| static noinline __init void clear_bss_section(void) |
| { |
| memset(__bss_start, 0, __bss_stop - __bss_start); |
| } |
| |
| /* |
| * Initialize storage key for kernel pages |
| */ |
| static noinline __init void init_kernel_storage_key(void) |
| { |
| unsigned long end_pfn, init_pfn; |
| |
| end_pfn = PFN_UP(__pa(&_end)); |
| |
| for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) |
| page_set_storage_key(init_pfn << PAGE_SHIFT, |
| PAGE_DEFAULT_KEY, 0); |
| } |
| |
| static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); |
| |
| static noinline __init void detect_machine_type(void) |
| { |
| /* Check current-configuration-level */ |
| if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; |
| return; |
| } |
| /* Get virtual-machine cpu information. */ |
| if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) |
| return; |
| |
| /* Running under KVM? If not we assume z/VM */ |
| if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; |
| else |
| S390_lowcore.machine_flags |= MACHINE_FLAG_VM; |
| } |
| |
| static __init void early_pgm_check_handler(void) |
| { |
| unsigned long addr; |
| const struct exception_table_entry *fixup; |
| |
| addr = S390_lowcore.program_old_psw.addr; |
| fixup = search_exception_tables(addr & PSW_ADDR_INSN); |
| if (!fixup) |
| disabled_wait(0); |
| S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; |
| } |
| |
| static noinline __init void setup_lowcore_early(void) |
| { |
| psw_t psw; |
| |
| psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; |
| psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; |
| S390_lowcore.external_new_psw = psw; |
| psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; |
| S390_lowcore.program_new_psw = psw; |
| s390_base_pgm_handler_fn = early_pgm_check_handler; |
| } |
| |
| static noinline __init void setup_facility_list(void) |
| { |
| stfle(S390_lowcore.stfle_fac_list, |
| ARRAY_SIZE(S390_lowcore.stfle_fac_list)); |
| } |
| |
| static noinline __init void setup_hpage(void) |
| { |
| #ifndef CONFIG_DEBUG_PAGEALLOC |
| if (!test_facility(2) || !test_facility(8)) |
| return; |
| S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; |
| __ctl_set_bit(0, 23); |
| #endif |
| } |
| |
| static __init void detect_mvpg(void) |
| { |
| #ifndef CONFIG_64BIT |
| int rc; |
| |
| asm volatile( |
| " la 0,0\n" |
| " mvpg %2,%2\n" |
| "0: la %0,0\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); |
| if (!rc) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; |
| #endif |
| } |
| |
| static __init void detect_ieee(void) |
| { |
| #ifndef CONFIG_64BIT |
| int rc, tmp; |
| |
| asm volatile( |
| " efpc %1,0\n" |
| "0: la %0,0\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); |
| if (!rc) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; |
| #endif |
| } |
| |
| static __init void detect_csp(void) |
| { |
| #ifndef CONFIG_64BIT |
| int rc; |
| |
| asm volatile( |
| " la 0,0\n" |
| " la 1,0\n" |
| " la 2,4\n" |
| " csp 0,2\n" |
| "0: la %0,0\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); |
| if (!rc) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; |
| #endif |
| } |
| |
| static __init void detect_diag9c(void) |
| { |
| unsigned int cpu_address; |
| int rc; |
| |
| cpu_address = stap(); |
| asm volatile( |
| " diag %2,0,0x9c\n" |
| "0: la %0,0\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); |
| if (!rc) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; |
| } |
| |
| static __init void detect_diag44(void) |
| { |
| #ifdef CONFIG_64BIT |
| int rc; |
| |
| asm volatile( |
| " diag 0,0,0x44\n" |
| "0: la %0,0\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); |
| if (!rc) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; |
| #endif |
| } |
| |
| static __init void detect_machine_facilities(void) |
| { |
| #ifdef CONFIG_64BIT |
| if (test_facility(3)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; |
| if (test_facility(8)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; |
| if (test_facility(11)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; |
| if (test_facility(27)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; |
| if (test_facility(40)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; |
| if (test_facility(25)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF; |
| #endif |
| } |
| |
| static __init void rescue_initrd(void) |
| { |
| #ifdef CONFIG_BLK_DEV_INITRD |
| unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); |
| /* |
| * Just like in case of IPL from VM reader we make sure there is a |
| * gap of 4MB between end of kernel and start of initrd. |
| * That way we can also be sure that saving an NSS will succeed, |
| * which however only requires different segments. |
| */ |
| if (!INITRD_START || !INITRD_SIZE) |
| return; |
| if (INITRD_START >= min_initrd_addr) |
| return; |
| memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); |
| INITRD_START = min_initrd_addr; |
| #endif |
| } |
| |
| /* Set up boot command line */ |
| static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) |
| { |
| char *parm, *delim; |
| size_t rc, len; |
| |
| len = strlen(boot_command_line); |
| |
| delim = boot_command_line + len; /* '\0' character position */ |
| parm = boot_command_line + len + 1; /* append right after '\0' */ |
| |
| rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); |
| if (rc) { |
| if (*parm == '=') |
| memmove(boot_command_line, parm + 1, rc); |
| else |
| *delim = ' '; /* replace '\0' with space */ |
| } |
| } |
| |
| static inline int has_ebcdic_char(const char *str) |
| { |
| int i; |
| |
| for (i = 0; str[i]; i++) |
| if (str[i] & 0x80) |
| return 1; |
| return 0; |
| } |
| |
| static void __init setup_boot_command_line(void) |
| { |
| COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; |
| /* convert arch command line to ascii if necessary */ |
| if (has_ebcdic_char(COMMAND_LINE)) |
| EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); |
| /* copy arch command line */ |
| strlcpy(boot_command_line, strstrip(COMMAND_LINE), |
| ARCH_COMMAND_LINE_SIZE); |
| |
| /* append IPL PARM data to the boot command line */ |
| if (MACHINE_IS_VM) |
| append_to_cmdline(append_ipl_vmparm); |
| |
| append_to_cmdline(append_ipl_scpdata); |
| } |
| |
| |
| /* |
| * Save ipl parameters, clear bss memory, initialize storage keys |
| * and create a kernel NSS at startup if the SAVESYS= parm is defined |
| */ |
| void __init startup_init(void) |
| { |
| reset_tod_clock(); |
| ipl_save_parameters(); |
| rescue_initrd(); |
| clear_bss_section(); |
| init_kernel_storage_key(); |
| lockdep_init(); |
| lockdep_off(); |
| sort_main_extable(); |
| setup_lowcore_early(); |
| setup_facility_list(); |
| detect_machine_type(); |
| ipl_update_parameters(); |
| setup_boot_command_line(); |
| create_kernel_nss(); |
| detect_mvpg(); |
| detect_ieee(); |
| detect_csp(); |
| detect_diag9c(); |
| detect_diag44(); |
| detect_machine_facilities(); |
| setup_hpage(); |
| sclp_facilities_detect(); |
| detect_memory_layout(memory_chunk); |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; |
| #endif |
| lockdep_on(); |
| } |