| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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/lockdep.h> |
| #include <linux/extable.h> |
| #include <linux/pfn.h> |
| #include <linux/uaccess.h> |
| #include <linux/kernel.h> |
| #include <asm/diag.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 <asm/boot_data.h> |
| #include <asm/switch_to.h> |
| #include "entry.h" |
| |
| static void __init reset_tod_clock(void) |
| { |
| u64 time; |
| |
| if (store_tod_clock(&time) == 0) |
| return; |
| /* TOD clock not running. Set the clock to Unix Epoch. */ |
| if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0) |
| disabled_wait(); |
| |
| memset(tod_clock_base, 0, 16); |
| *(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH; |
| S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; |
| } |
| |
| /* |
| * Initialize storage key for kernel pages |
| */ |
| static noinline __init void init_kernel_storage_key(void) |
| { |
| #if PAGE_DEFAULT_KEY |
| 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); |
| #endif |
| } |
| |
| static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); |
| |
| static noinline __init void detect_machine_type(void) |
| { |
| struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; |
| |
| /* Check current-configuration-level */ |
| if (stsi(NULL, 0, 0, 0) <= 2) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; |
| return; |
| } |
| /* Get virtual-machine cpu information. */ |
| if (stsi(vmms, 3, 2, 2) || !vmms->count) |
| return; |
| |
| /* Detect known hypervisors */ |
| if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; |
| else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_VM; |
| } |
| |
| /* Remove leading, trailing and double whitespace. */ |
| static inline void strim_all(char *str) |
| { |
| char *s; |
| |
| s = strim(str); |
| if (s != str) |
| memmove(str, s, strlen(s)); |
| while (*str) { |
| if (!isspace(*str++)) |
| continue; |
| if (isspace(*str)) { |
| s = skip_spaces(str); |
| memmove(str, s, strlen(s) + 1); |
| } |
| } |
| } |
| |
| static noinline __init void setup_arch_string(void) |
| { |
| struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; |
| struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; |
| char mstr[80], hvstr[17]; |
| |
| if (stsi(mach, 1, 1, 1)) |
| return; |
| EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); |
| EBCASC(mach->type, sizeof(mach->type)); |
| EBCASC(mach->model, sizeof(mach->model)); |
| EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); |
| sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", |
| mach->manufacturer, mach->type, |
| mach->model, mach->model_capacity); |
| strim_all(mstr); |
| if (stsi(vm, 3, 2, 2) == 0 && vm->count) { |
| EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); |
| sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); |
| strim_all(hvstr); |
| } else { |
| sprintf(hvstr, "%s", |
| MACHINE_IS_LPAR ? "LPAR" : |
| MACHINE_IS_VM ? "z/VM" : |
| MACHINE_IS_KVM ? "KVM" : "unknown"); |
| } |
| dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); |
| } |
| |
| static __init void setup_topology(void) |
| { |
| int max_mnest; |
| |
| if (!test_facility(11)) |
| return; |
| S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; |
| for (max_mnest = 6; max_mnest > 1; max_mnest--) { |
| if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) |
| break; |
| } |
| topology_max_mnest = max_mnest; |
| } |
| |
| static void early_pgm_check_handler(void) |
| { |
| const struct exception_table_entry *fixup; |
| unsigned long cr0, cr0_new; |
| unsigned long addr; |
| |
| addr = S390_lowcore.program_old_psw.addr; |
| fixup = s390_search_extables(addr); |
| if (!fixup) |
| disabled_wait(); |
| /* Disable low address protection before storing into lowcore. */ |
| __ctl_store(cr0, 0, 0); |
| cr0_new = cr0 & ~(1UL << 28); |
| __ctl_load(cr0_new, 0, 0); |
| S390_lowcore.program_old_psw.addr = extable_fixup(fixup); |
| __ctl_load(cr0, 0, 0); |
| } |
| |
| 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; |
| if (IS_ENABLED(CONFIG_KASAN)) |
| psw.mask |= PSW_MASK_DAT; |
| psw.addr = (unsigned long) s390_base_ext_handler; |
| S390_lowcore.external_new_psw = psw; |
| psw.addr = (unsigned long) s390_base_pgm_handler; |
| S390_lowcore.program_new_psw = psw; |
| s390_base_pgm_handler_fn = early_pgm_check_handler; |
| S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; |
| } |
| |
| static noinline __init void setup_facility_list(void) |
| { |
| memcpy(S390_lowcore.alt_stfle_fac_list, |
| S390_lowcore.stfle_fac_list, |
| sizeof(S390_lowcore.alt_stfle_fac_list)); |
| if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) |
| __clear_facility(82, S390_lowcore.alt_stfle_fac_list); |
| } |
| |
| static __init void detect_diag9c(void) |
| { |
| unsigned int cpu_address; |
| int rc; |
| |
| cpu_address = stap(); |
| diag_stat_inc(DIAG_STAT_X09C); |
| 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_machine_facilities(void) |
| { |
| if (test_facility(8)) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; |
| __ctl_set_bit(0, 23); |
| } |
| if (test_facility(78)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; |
| if (test_facility(3)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; |
| if (test_facility(50) && test_facility(73)) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_TE; |
| __ctl_set_bit(0, 55); |
| } |
| if (test_facility(51)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; |
| if (test_facility(129)) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_VX; |
| __ctl_set_bit(0, 17); |
| } |
| if (test_facility(130) && !noexec_disabled) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_NX; |
| __ctl_set_bit(0, 20); |
| } |
| if (test_facility(133)) |
| S390_lowcore.machine_flags |= MACHINE_FLAG_GS; |
| if (test_facility(139) && (tod_clock_base[1] & 0x80)) { |
| /* Enabled signed clock comparator comparisons */ |
| S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; |
| clock_comparator_max = -1ULL >> 1; |
| __ctl_set_bit(0, 53); |
| } |
| if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { |
| S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO; |
| /* the control bit is set during PCI initialization */ |
| } |
| } |
| |
| static inline void save_vector_registers(void) |
| { |
| #ifdef CONFIG_CRASH_DUMP |
| if (test_facility(129)) |
| save_vx_regs(boot_cpu_vector_save_area); |
| #endif |
| } |
| |
| static inline void setup_control_registers(void) |
| { |
| unsigned long reg; |
| |
| __ctl_store(reg, 0, 0); |
| reg |= CR0_LOW_ADDRESS_PROTECTION; |
| reg |= CR0_EMERGENCY_SIGNAL_SUBMASK; |
| reg |= CR0_EXTERNAL_CALL_SUBMASK; |
| __ctl_load(reg, 0, 0); |
| } |
| |
| static inline void setup_access_registers(void) |
| { |
| unsigned int acrs[NUM_ACRS] = { 0 }; |
| |
| restore_access_regs(acrs); |
| } |
| |
| static int __init disable_vector_extension(char *str) |
| { |
| S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; |
| __ctl_clear_bit(0, 17); |
| return 0; |
| } |
| early_param("novx", disable_vector_extension); |
| |
| char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; |
| static void __init setup_boot_command_line(void) |
| { |
| /* copy arch command line */ |
| strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE); |
| } |
| |
| static void __init check_image_bootable(void) |
| { |
| if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING))) |
| return; |
| |
| sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n"); |
| sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n"); |
| sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n"); |
| disabled_wait(); |
| } |
| |
| void __init startup_init(void) |
| { |
| reset_tod_clock(); |
| check_image_bootable(); |
| time_early_init(); |
| init_kernel_storage_key(); |
| lockdep_off(); |
| setup_lowcore_early(); |
| setup_facility_list(); |
| detect_machine_type(); |
| setup_arch_string(); |
| setup_boot_command_line(); |
| detect_diag9c(); |
| detect_machine_facilities(); |
| save_vector_registers(); |
| setup_topology(); |
| sclp_early_detect(); |
| setup_control_registers(); |
| setup_access_registers(); |
| lockdep_on(); |
| } |