// SPDX-License-Identifier: GPL-2.0 /* * S390 version * Copyright IBM Corp. 1999, 2012 * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "arch/i386/kernel/setup.c" * Copyright (C) 1995, Linus Torvalds */ /* * This file handles the architecture-dependent parts of initialization */ #define KMSG_COMPONENT "setup" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "entry.h" /* * Machine setup.. */ unsigned int console_mode = 0; EXPORT_SYMBOL(console_mode); unsigned int console_devno = -1; EXPORT_SYMBOL(console_devno); unsigned int console_irq = -1; EXPORT_SYMBOL(console_irq); unsigned long elf_hwcap __read_mostly = 0; char elf_platform[ELF_PLATFORM_SIZE]; unsigned long int_hwcap = 0; int __bootdata(noexec_disabled); unsigned long __bootdata(ident_map_size); unsigned long __bootdata(vmalloc_size); struct mem_detect_info __bootdata(mem_detect); struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); unsigned long __bootdata_preserved(__stext_dma); unsigned long __bootdata_preserved(__etext_dma); unsigned long __bootdata_preserved(__sdma); unsigned long __bootdata_preserved(__edma); unsigned long __bootdata_preserved(__kaslr_offset); unsigned int __bootdata_preserved(zlib_dfltcc_support); EXPORT_SYMBOL(zlib_dfltcc_support); unsigned long VMALLOC_START; EXPORT_SYMBOL(VMALLOC_START); unsigned long VMALLOC_END; EXPORT_SYMBOL(VMALLOC_END); struct page *vmemmap; EXPORT_SYMBOL(vmemmap); unsigned long vmemmap_size; unsigned long MODULES_VADDR; unsigned long MODULES_END; /* An array with a pointer to the lowcore of every CPU. */ struct lowcore *lowcore_ptr[NR_CPUS]; EXPORT_SYMBOL(lowcore_ptr); /* * The Write Back bit position in the physaddr is given by the SLPC PCI. * Leaving the mask zero always uses write through which is safe */ unsigned long mio_wb_bit_mask __ro_after_init; /* * This is set up by the setup-routine at boot-time * for S390 need to find out, what we have to setup * using address 0x10400 ... */ #include /* * condev= and conmode= setup parameter. */ static int __init condev_setup(char *str) { int vdev; vdev = simple_strtoul(str, &str, 0); if (vdev >= 0 && vdev < 65536) { console_devno = vdev; console_irq = -1; } return 1; } __setup("condev=", condev_setup); static void __init set_preferred_console(void) { if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) add_preferred_console("ttyS", 0, NULL); else if (CONSOLE_IS_3270) add_preferred_console("tty3270", 0, NULL); else if (CONSOLE_IS_VT220) add_preferred_console("ttyS", 1, NULL); else if (CONSOLE_IS_HVC) add_preferred_console("hvc", 0, NULL); } static int __init conmode_setup(char *str) { #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) SET_CONSOLE_SCLP; #endif #if defined(CONFIG_TN3215_CONSOLE) if (!strcmp(str, "3215")) SET_CONSOLE_3215; #endif #if defined(CONFIG_TN3270_CONSOLE) if (!strcmp(str, "3270")) SET_CONSOLE_3270; #endif set_preferred_console(); return 1; } __setup("conmode=", conmode_setup); static void __init conmode_default(void) { char query_buffer[1024]; char *ptr; if (MACHINE_IS_VM) { cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); console_devno = simple_strtoul(query_buffer + 5, NULL, 16); ptr = strstr(query_buffer, "SUBCHANNEL ="); console_irq = simple_strtoul(ptr + 13, NULL, 16); cpcmd("QUERY TERM", query_buffer, 1024, NULL); ptr = strstr(query_buffer, "CONMODE"); /* * Set the conmode to 3215 so that the device recognition * will set the cu_type of the console to 3215. If the * conmode is 3270 and we don't set it back then both * 3215 and the 3270 driver will try to access the console * device (3215 as console and 3270 as normal tty). */ cpcmd("TERM CONMODE 3215", NULL, 0, NULL); if (ptr == NULL) { #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) SET_CONSOLE_SCLP; #endif return; } if (str_has_prefix(ptr + 8, "3270")) { #if defined(CONFIG_TN3270_CONSOLE) SET_CONSOLE_3270; #elif defined(CONFIG_TN3215_CONSOLE) SET_CONSOLE_3215; #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) SET_CONSOLE_SCLP; #endif } else if (str_has_prefix(ptr + 8, "3215")) { #if defined(CONFIG_TN3215_CONSOLE) SET_CONSOLE_3215; #elif defined(CONFIG_TN3270_CONSOLE) SET_CONSOLE_3270; #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) SET_CONSOLE_SCLP; #endif } } else if (MACHINE_IS_KVM) { if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) SET_CONSOLE_VT220; else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) SET_CONSOLE_SCLP; else SET_CONSOLE_HVC; } else { #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) SET_CONSOLE_SCLP; #endif } } #ifdef CONFIG_CRASH_DUMP static void __init setup_zfcpdump(void) { if (!is_ipl_type_dump()) return; if (OLDMEM_BASE) return; strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); console_loglevel = 2; } #else static inline void setup_zfcpdump(void) {} #endif /* CONFIG_CRASH_DUMP */ /* * Reboot, halt and power_off stubs. They just call _machine_restart, * _machine_halt or _machine_power_off. */ void machine_restart(char *command) { if ((!in_interrupt() && !in_atomic()) || oops_in_progress) /* * Only unblank the console if we are called in enabled * context or a bust_spinlocks cleared the way for us. */ console_unblank(); _machine_restart(command); } void machine_halt(void) { if (!in_interrupt() || oops_in_progress) /* * Only unblank the console if we are called in enabled * context or a bust_spinlocks cleared the way for us. */ console_unblank(); _machine_halt(); } void machine_power_off(void) { if (!in_interrupt() || oops_in_progress) /* * Only unblank the console if we are called in enabled * context or a bust_spinlocks cleared the way for us. */ console_unblank(); _machine_power_off(); } /* * Dummy power off function. */ void (*pm_power_off)(void) = machine_power_off; EXPORT_SYMBOL_GPL(pm_power_off); void *restart_stack; unsigned long stack_alloc(void) { #ifdef CONFIG_VMAP_STACK return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, NUMA_NO_NODE, __builtin_return_address(0)); #else return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); #endif } void stack_free(unsigned long stack) { #ifdef CONFIG_VMAP_STACK vfree((void *) stack); #else free_pages(stack, THREAD_SIZE_ORDER); #endif } int __init arch_early_irq_init(void) { unsigned long stack; stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); if (!stack) panic("Couldn't allocate async stack"); S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; return 0; } static int __init async_stack_realloc(void) { unsigned long old, new; old = S390_lowcore.async_stack - STACK_INIT_OFFSET; new = stack_alloc(); if (!new) panic("Couldn't allocate async stack"); WRITE_ONCE(S390_lowcore.async_stack, new + STACK_INIT_OFFSET); free_pages(old, THREAD_SIZE_ORDER); return 0; } early_initcall(async_stack_realloc); void __init arch_call_rest_init(void) { unsigned long stack; stack = stack_alloc(); if (!stack) panic("Couldn't allocate kernel stack"); current->stack = (void *) stack; #ifdef CONFIG_VMAP_STACK current->stack_vm_area = (void *) stack; #endif set_task_stack_end_magic(current); stack += STACK_INIT_OFFSET; S390_lowcore.kernel_stack = stack; CALL_ON_STACK_NORETURN(rest_init, stack); } static void __init setup_lowcore_dat_off(void) { unsigned long int_psw_mask = PSW_KERNEL_BITS; struct lowcore *lc; if (IS_ENABLED(CONFIG_KASAN)) int_psw_mask |= PSW_MASK_DAT; /* * Setup lowcore for boot cpu */ BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); if (!lc) panic("%s: Failed to allocate %zu bytes align=%zx\n", __func__, sizeof(*lc), sizeof(*lc)); lc->restart_psw.mask = PSW_KERNEL_BITS; lc->restart_psw.addr = (unsigned long) restart_int_handler; lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; lc->external_new_psw.addr = (unsigned long) ext_int_handler; lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; lc->svc_new_psw.addr = (unsigned long) system_call; lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; lc->program_new_psw.addr = (unsigned long) pgm_check_handler; lc->mcck_new_psw.mask = PSW_KERNEL_BITS; lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; lc->io_new_psw.addr = (unsigned long) io_int_handler; lc->clock_comparator = clock_comparator_max; lc->nodat_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); lc->current_task = (unsigned long)&init_task; lc->lpp = LPP_MAGIC; lc->machine_flags = S390_lowcore.machine_flags; lc->preempt_count = S390_lowcore.preempt_count; lc->stfl_fac_list = S390_lowcore.stfl_fac_list; memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, sizeof(lc->stfle_fac_list)); memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, sizeof(lc->alt_stfle_fac_list)); nmi_alloc_boot_cpu(lc); lc->sys_enter_timer = S390_lowcore.sys_enter_timer; lc->exit_timer = S390_lowcore.exit_timer; lc->user_timer = S390_lowcore.user_timer; lc->system_timer = S390_lowcore.system_timer; lc->steal_timer = S390_lowcore.steal_timer; lc->last_update_timer = S390_lowcore.last_update_timer; lc->last_update_clock = S390_lowcore.last_update_clock; /* * Allocate the global restart stack which is the same for * all CPUs in cast *one* of them does a PSW restart. */ restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); if (!restart_stack) panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__, THREAD_SIZE, THREAD_SIZE); restart_stack += STACK_INIT_OFFSET; /* * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant * restart data to the absolute zero lowcore. This is necessary if * PSW restart is done on an offline CPU that has lowcore zero. */ lc->restart_stack = (unsigned long) restart_stack; lc->restart_fn = (unsigned long) do_restart; lc->restart_data = 0; lc->restart_source = -1UL; /* Setup absolute zero lowcore */ mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); lc->spinlock_lockval = arch_spin_lockval(0); lc->spinlock_index = 0; arch_spin_lock_setup(0); lc->br_r1_trampoline = 0x07f1; /* br %r1 */ lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); set_prefix((u32)(unsigned long) lc); lowcore_ptr[0] = lc; } static void __init setup_lowcore_dat_on(void) { __ctl_clear_bit(0, 28); S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; __ctl_set_bit(0, 28); } static struct resource code_resource = { .name = "Kernel code", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; static struct resource data_resource = { .name = "Kernel data", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; static struct resource bss_resource = { .name = "Kernel bss", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; static struct resource __initdata *standard_resources[] = { &code_resource, &data_resource, &bss_resource, }; static void __init setup_resources(void) { struct resource *res, *std_res, *sub_res; phys_addr_t start, end; int j; u64 i; code_resource.start = (unsigned long) _text; code_resource.end = (unsigned long) _etext - 1; data_resource.start = (unsigned long) _etext; data_resource.end = (unsigned long) _edata - 1; bss_resource.start = (unsigned long) __bss_start; bss_resource.end = (unsigned long) __bss_stop - 1; for_each_mem_range(i, &start, &end) { res = memblock_alloc(sizeof(*res), 8); if (!res) panic("%s: Failed to allocate %zu bytes align=0x%x\n", __func__, sizeof(*res), 8); res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; res->name = "System RAM"; res->start = start; /* * In memblock, end points to the first byte after the * range while in resourses, end points to the last byte in * the range. */ res->end = end - 1; request_resource(&iomem_resource, res); for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { std_res = standard_resources[j]; if (std_res->start < res->start || std_res->start > res->end) continue; if (std_res->end > res->end) { sub_res = memblock_alloc(sizeof(*sub_res), 8); if (!sub_res) panic("%s: Failed to allocate %zu bytes align=0x%x\n", __func__, sizeof(*sub_res), 8); *sub_res = *std_res; sub_res->end = res->end; std_res->start = res->end + 1; request_resource(res, sub_res); } else { request_resource(res, std_res); } } } #ifdef CONFIG_CRASH_DUMP /* * Re-add removed crash kernel memory as reserved memory. This makes * sure it will be mapped with the identity mapping and struct pages * will be created, so it can be resized later on. * However add it later since the crash kernel resource should not be * part of the System RAM resource. */ if (crashk_res.end) { memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); memblock_reserve(crashk_res.start, resource_size(&crashk_res)); insert_resource(&iomem_resource, &crashk_res); } #endif } static void __init setup_ident_map_size(void) { unsigned long vmax, tmp; /* Choose kernel address space layout: 3 or 4 levels. */ tmp = ident_map_size / PAGE_SIZE; tmp = tmp * (sizeof(struct page) + PAGE_SIZE); if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) vmax = _REGION2_SIZE; /* 3-level kernel page table */ else vmax = _REGION1_SIZE; /* 4-level kernel page table */ /* module area is at the end of the kernel address space. */ MODULES_END = vmax; if (is_prot_virt_host()) adjust_to_uv_max(&MODULES_END); #ifdef CONFIG_KASAN vmax = _REGION1_SIZE; MODULES_END = kasan_vmax; #endif MODULES_VADDR = MODULES_END - MODULES_LEN; VMALLOC_END = MODULES_VADDR; VMALLOC_START = VMALLOC_END - vmalloc_size; /* Split remaining virtual space between 1:1 mapping & vmemmap array */ tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ tmp = SECTION_ALIGN_UP(tmp); tmp = VMALLOC_START - tmp * sizeof(struct page); tmp &= ~((vmax >> 11) - 1); /* align to page table level */ tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); vmemmap = (struct page *) tmp; /* Take care that ident_map_size <= vmemmap */ ident_map_size = min(ident_map_size, (unsigned long)vmemmap); #ifdef CONFIG_KASAN ident_map_size = min(ident_map_size, KASAN_SHADOW_START); #endif vmemmap_size = SECTION_ALIGN_UP(ident_map_size / PAGE_SIZE) * sizeof(struct page); #ifdef CONFIG_KASAN /* move vmemmap above kasan shadow only if stands in a way */ if (KASAN_SHADOW_END > (unsigned long)vmemmap && (unsigned long)vmemmap + vmemmap_size > KASAN_SHADOW_START) vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); #endif max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); memblock_remove(ident_map_size, ULONG_MAX); pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); } #ifdef CONFIG_CRASH_DUMP /* * When kdump is enabled, we have to ensure that no memory from the area * [0 - crashkernel memory size] is set offline - it will be exchanged with * the crashkernel memory region when kdump is triggered. The crashkernel * memory region can never get offlined (pages are unmovable). */ static int kdump_mem_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct memory_notify *arg = data; if (action != MEM_GOING_OFFLINE) return NOTIFY_OK; if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) return NOTIFY_BAD; return NOTIFY_OK; } static struct notifier_block kdump_mem_nb = { .notifier_call = kdump_mem_notifier, }; #endif /* * Make sure that the area above identity mapping is protected */ static void __init reserve_above_ident_map(void) { memblock_reserve(ident_map_size, ULONG_MAX); } /* * Make sure that oldmem, where the dump is stored, is protected */ static void __init reserve_oldmem(void) { #ifdef CONFIG_CRASH_DUMP if (OLDMEM_BASE) /* Forget all memory above the running kdump system */ memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); #endif } /* * Make sure that oldmem, where the dump is stored, is protected */ static void __init remove_oldmem(void) { #ifdef CONFIG_CRASH_DUMP if (OLDMEM_BASE) /* Forget all memory above the running kdump system */ memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); #endif } /* * Reserve memory for kdump kernel to be loaded with kexec */ static void __init reserve_crashkernel(void) { #ifdef CONFIG_CRASH_DUMP unsigned long long crash_base, crash_size; phys_addr_t low, high; int rc; rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, &crash_base); crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); if (rc || crash_size == 0) return; if (memblock.memory.regions[0].size < crash_size) { pr_info("crashkernel reservation failed: %s\n", "first memory chunk must be at least crashkernel size"); return; } low = crash_base ?: OLDMEM_BASE; high = low + crash_size; if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { /* The crashkernel fits into OLDMEM, reuse OLDMEM */ crash_base = low; } else { /* Find suitable area in free memory */ low = max_t(unsigned long, crash_size, sclp.hsa_size); high = crash_base ? crash_base + crash_size : ULONG_MAX; if (crash_base && crash_base < low) { pr_info("crashkernel reservation failed: %s\n", "crash_base too low"); return; } low = crash_base ?: low; crash_base = memblock_find_in_range(low, high, crash_size, KEXEC_CRASH_MEM_ALIGN); } if (!crash_base) { pr_info("crashkernel reservation failed: %s\n", "no suitable area found"); return; } if (register_memory_notifier(&kdump_mem_nb)) return; if (!OLDMEM_BASE && MACHINE_IS_VM) diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); crashk_res.start = crash_base; crashk_res.end = crash_base + crash_size - 1; memblock_remove(crash_base, crash_size); pr_info("Reserving %lluMB of memory at %lluMB " "for crashkernel (System RAM: %luMB)\n", crash_size >> 20, crash_base >> 20, (unsigned long)memblock.memory.total_size >> 20); os_info_crashkernel_add(crash_base, crash_size); #endif } /* * Reserve the initrd from being used by memblock */ static void __init reserve_initrd(void) { #ifdef CONFIG_BLK_DEV_INITRD if (!INITRD_START || !INITRD_SIZE) return; initrd_start = INITRD_START; initrd_end = initrd_start + INITRD_SIZE; memblock_reserve(INITRD_START, INITRD_SIZE); #endif } /* * Reserve the memory area used to pass the certificate lists */ static void __init reserve_certificate_list(void) { if (ipl_cert_list_addr) memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); } static void __init reserve_mem_detect_info(void) { unsigned long start, size; get_mem_detect_reserved(&start, &size); if (size) memblock_reserve(start, size); } static void __init free_mem_detect_info(void) { unsigned long start, size; get_mem_detect_reserved(&start, &size); if (size) memblock_free(start, size); } static const char * __init get_mem_info_source(void) { switch (mem_detect.info_source) { case MEM_DETECT_SCLP_STOR_INFO: return "sclp storage info"; case MEM_DETECT_DIAG260: return "diag260"; case MEM_DETECT_SCLP_READ_INFO: return "sclp read info"; case MEM_DETECT_BIN_SEARCH: return "binary search"; } return "none"; } static void __init memblock_add_mem_detect_info(void) { unsigned long start, end; int i; pr_debug("physmem info source: %s (%hhd)\n", get_mem_info_source(), mem_detect.info_source); /* keep memblock lists close to the kernel */ memblock_set_bottom_up(true); for_each_mem_detect_block(i, &start, &end) { memblock_add(start, end - start); memblock_physmem_add(start, end - start); } memblock_set_bottom_up(false); memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); memblock_dump_all(); } /* * Check for initrd being in usable memory */ static void __init check_initrd(void) { #ifdef CONFIG_BLK_DEV_INITRD if (INITRD_START && INITRD_SIZE && !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { pr_err("The initial RAM disk does not fit into the memory\n"); memblock_free(INITRD_START, INITRD_SIZE); initrd_start = initrd_end = 0; } #endif } /* * Reserve memory used for lowcore/command line/kernel image. */ static void __init reserve_kernel(void) { unsigned long start_pfn = PFN_UP(__pa(_end)); memblock_reserve(0, HEAD_END); memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) - (unsigned long)_stext); memblock_reserve(__sdma, __edma - __sdma); } static void __init setup_memory(void) { phys_addr_t start, end; u64 i; /* * Init storage key for present memory */ for_each_mem_range(i, &start, &end) storage_key_init_range(start, end); psw_set_key(PAGE_DEFAULT_KEY); /* Only cosmetics */ memblock_enforce_memory_limit(memblock_end_of_DRAM()); } /* * Setup hardware capabilities. */ static int __init setup_hwcaps(void) { static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; struct cpuid cpu_id; int i; /* * The store facility list bits numbers as found in the principles * of operation are numbered with bit 1UL<<31 as number 0 to * bit 1UL<<0 as number 31. * Bit 0: instructions named N3, "backported" to esa-mode * Bit 2: z/Architecture mode is active * Bit 7: the store-facility-list-extended facility is installed * Bit 17: the message-security assist is installed * Bit 19: the long-displacement facility is installed * Bit 21: the extended-immediate facility is installed * Bit 22: extended-translation facility 3 is installed * Bit 30: extended-translation facility 3 enhancement facility * These get translated to: * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and * HWCAP_S390_ETF3EH bit 8 (22 && 30). */ for (i = 0; i < 6; i++) if (test_facility(stfl_bits[i])) elf_hwcap |= 1UL << i; if (test_facility(22) && test_facility(30)) elf_hwcap |= HWCAP_S390_ETF3EH; /* * Check for additional facilities with store-facility-list-extended. * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information * as stored by stfl, bits 32-xxx contain additional facilities. * How many facility words are stored depends on the number of * doublewords passed to the instruction. The additional facilities * are: * Bit 42: decimal floating point facility is installed * Bit 44: perform floating point operation facility is installed * translated to: * HWCAP_S390_DFP bit 6 (42 && 44). */ if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) elf_hwcap |= HWCAP_S390_DFP; /* * Huge page support HWCAP_S390_HPAGE is bit 7. */ if (MACHINE_HAS_EDAT1) elf_hwcap |= HWCAP_S390_HPAGE; /* * 64-bit register support for 31-bit processes * HWCAP_S390_HIGH_GPRS is bit 9. */ elf_hwcap |= HWCAP_S390_HIGH_GPRS; /* * Transactional execution support HWCAP_S390_TE is bit 10. */ if (MACHINE_HAS_TE) elf_hwcap |= HWCAP_S390_TE; /* * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX * instead of facility bit 129. */ if (MACHINE_HAS_VX) { elf_hwcap |= HWCAP_S390_VXRS; if (test_facility(134)) elf_hwcap |= HWCAP_S390_VXRS_EXT; if (test_facility(135)) elf_hwcap |= HWCAP_S390_VXRS_BCD; if (test_facility(148)) elf_hwcap |= HWCAP_S390_VXRS_EXT2; if (test_facility(152)) elf_hwcap |= HWCAP_S390_VXRS_PDE; } if (test_facility(150)) elf_hwcap |= HWCAP_S390_SORT; if (test_facility(151)) elf_hwcap |= HWCAP_S390_DFLT; /* * Guarded storage support HWCAP_S390_GS is bit 12. */ if (MACHINE_HAS_GS) elf_hwcap |= HWCAP_S390_GS; get_cpu_id(&cpu_id); add_device_randomness(&cpu_id, sizeof(cpu_id)); switch (cpu_id.machine) { case 0x2064: case 0x2066: default: /* Use "z900" as default for 64 bit kernels. */ strcpy(elf_platform, "z900"); break; case 0x2084: case 0x2086: strcpy(elf_platform, "z990"); break; case 0x2094: case 0x2096: strcpy(elf_platform, "z9-109"); break; case 0x2097: case 0x2098: strcpy(elf_platform, "z10"); break; case 0x2817: case 0x2818: strcpy(elf_platform, "z196"); break; case 0x2827: case 0x2828: strcpy(elf_platform, "zEC12"); break; case 0x2964: case 0x2965: strcpy(elf_platform, "z13"); break; case 0x3906: case 0x3907: strcpy(elf_platform, "z14"); break; case 0x8561: case 0x8562: strcpy(elf_platform, "z15"); break; } /* * Virtualization support HWCAP_INT_SIE is bit 0. */ if (sclp.has_sief2) int_hwcap |= HWCAP_INT_SIE; return 0; } arch_initcall(setup_hwcaps); /* * Add system information as device randomness */ static void __init setup_randomness(void) { struct sysinfo_3_2_2 *vmms; vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); if (!vmms) panic("Failed to allocate memory for sysinfo structure\n"); if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); memblock_free((unsigned long) vmms, PAGE_SIZE); } /* * Find the correct size for the task_struct. This depends on * the size of the struct fpu at the end of the thread_struct * which is embedded in the task_struct. */ static void __init setup_task_size(void) { int task_size = sizeof(struct task_struct); if (!MACHINE_HAS_VX) { task_size -= sizeof(__vector128) * __NUM_VXRS; task_size += sizeof(freg_t) * __NUM_FPRS; } arch_task_struct_size = task_size; } /* * Issue diagnose 318 to set the control program name and * version codes. */ static void __init setup_control_program_code(void) { union diag318_info diag318_info = { .cpnc = CPNC_LINUX, .cpvc = 0, }; if (!sclp.has_diag318) return; diag_stat_inc(DIAG_STAT_X318); asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); } /* * Print the component list from the IPL report */ static void __init log_component_list(void) { struct ipl_rb_component_entry *ptr, *end; char *str; if (!early_ipl_comp_list_addr) return; if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) pr_info("Linux is running with Secure-IPL enabled\n"); else pr_info("Linux is running with Secure-IPL disabled\n"); ptr = (void *) early_ipl_comp_list_addr; end = (void *) ptr + early_ipl_comp_list_size; pr_info("The IPL report contains the following components:\n"); while (ptr < end) { if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) str = "signed, verified"; else str = "signed, verification failed"; } else { str = "not signed"; } pr_info("%016llx - %016llx (%s)\n", ptr->addr, ptr->addr + ptr->len, str); ptr++; } } /* * Setup function called from init/main.c just after the banner * was printed. */ void __init setup_arch(char **cmdline_p) { /* * print what head.S has found out about the machine */ if (MACHINE_IS_VM) pr_info("Linux is running as a z/VM " "guest operating system in 64-bit mode\n"); else if (MACHINE_IS_KVM) pr_info("Linux is running under KVM in 64-bit mode\n"); else if (MACHINE_IS_LPAR) pr_info("Linux is running natively in 64-bit mode\n"); else pr_info("Linux is running as a guest in 64-bit mode\n"); log_component_list(); /* Have one command line that is parsed and saved in /proc/cmdline */ /* boot_command_line has been already set up in early.c */ *cmdline_p = boot_command_line; ROOT_DEV = Root_RAM0; init_mm.start_code = (unsigned long) _text; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; init_mm.brk = (unsigned long) _end; if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) nospec_auto_detect(); jump_label_init(); parse_early_param(); #ifdef CONFIG_CRASH_DUMP /* Deactivate elfcorehdr= kernel parameter */ elfcorehdr_addr = ELFCORE_ADDR_MAX; #endif os_info_init(); setup_ipl(); setup_task_size(); setup_control_program_code(); /* Do some memory reservations *before* memory is added to memblock */ reserve_above_ident_map(); reserve_oldmem(); reserve_kernel(); reserve_initrd(); reserve_certificate_list(); reserve_mem_detect_info(); memblock_allow_resize(); /* Get information about *all* installed memory */ memblock_add_mem_detect_info(); free_mem_detect_info(); remove_oldmem(); setup_uv(); setup_ident_map_size(); setup_memory(); dma_contiguous_reserve(ident_map_size); vmcp_cma_reserve(); if (MACHINE_HAS_EDAT2) hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); check_initrd(); reserve_crashkernel(); #ifdef CONFIG_CRASH_DUMP /* * Be aware that smp_save_dump_cpus() triggers a system reset. * Therefore CPU and device initialization should be done afterwards. */ smp_save_dump_cpus(); #endif setup_resources(); setup_lowcore_dat_off(); smp_fill_possible_mask(); cpu_detect_mhz_feature(); cpu_init(); numa_setup(); smp_detect_cpus(); topology_init_early(); /* * Create kernel page tables and switch to virtual addressing. */ paging_init(); /* * After paging_init created the kernel page table, the new PSWs * in lowcore can now run with DAT enabled. */ setup_lowcore_dat_on(); /* Setup default console */ conmode_default(); set_preferred_console(); apply_alternative_instructions(); if (IS_ENABLED(CONFIG_EXPOLINE)) nospec_init_branches(); /* Setup zfcp/nvme dump support */ setup_zfcpdump(); /* Add system specific data to the random pool */ setup_randomness(); }