/* * 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 "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 = 0; char elf_platform[ELF_PLATFORM_SIZE]; int __initdata memory_end_set; unsigned long __initdata memory_end; unsigned long __initdata max_physmem_end; unsigned long VMALLOC_START; EXPORT_SYMBOL(VMALLOC_START); unsigned long VMALLOC_END; EXPORT_SYMBOL(VMALLOC_END); struct page *vmemmap; EXPORT_SYMBOL(vmemmap); 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); /* * 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 (MACHINE_IS_KVM) { if (sclp.has_vt220) add_preferred_console("ttyS", 1, NULL); else if (sclp.has_linemode) add_preferred_console("ttyS", 0, NULL); else add_preferred_console("hvc", 0, NULL); } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) add_preferred_console("ttyS", 0, NULL); else if (CONSOLE_IS_3270) add_preferred_console("tty3270", 0, NULL); } static int __init conmode_setup(char *str) { #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) SET_CONSOLE_SCLP; #endif #if defined(CONFIG_TN3215_CONSOLE) if (strncmp(str, "3215", 5) == 0) SET_CONSOLE_3215; #endif #if defined(CONFIG_TN3270_CONSOLE) if (strncmp(str, "3270", 5) == 0) 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 (strncmp(ptr + 8, "3270", 4) == 0) { #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 (strncmp(ptr + 8, "3215", 4) == 0) { #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 defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) SET_CONSOLE_SCLP; #endif } } #ifdef CONFIG_CRASH_DUMP static void __init setup_zfcpdump(void) { if (ipl_info.type != IPL_TYPE_FCP_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); static int __init early_parse_mem(char *p) { memory_end = memparse(p, &p); memory_end &= PAGE_MASK; memory_end_set = 1; return 0; } early_param("mem", early_parse_mem); static int __init parse_vmalloc(char *arg) { if (!arg) return -EINVAL; VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; return 0; } early_param("vmalloc", parse_vmalloc); void *restart_stack __attribute__((__section__(".data"))); static void __init setup_lowcore(void) { struct _lowcore *lc; /* * Setup lowcore for boot cpu */ BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); lc->restart_psw.mask = PSW_KERNEL_BITS; lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) restart_int_handler; lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK; lc->external_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) ext_int_handler; lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK; lc->program_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; lc->mcck_new_psw.mask = PSW_KERNEL_BITS; lc->mcck_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK; lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; lc->clock_comparator = -1ULL; lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); lc->async_stack = (unsigned long) __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); lc->panic_stack = (unsigned long) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); lc->current_task = (unsigned long) init_thread_union.thread_info.task; lc->thread_info = (unsigned long) &init_thread_union; lc->machine_flags = S390_lowcore.machine_flags; lc->stfl_fac_list = S390_lowcore.stfl_fac_list; memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, MAX_FACILITY_BIT/8); if (MACHINE_HAS_VX) lc->vector_save_area_addr = (unsigned long) &lc->vector_save_area; lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; lc->sync_enter_timer = S390_lowcore.sync_enter_timer; lc->async_enter_timer = S390_lowcore.async_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; restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); restart_stack += ASYNC_SIZE; /* * 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); #ifdef CONFIG_SMP lc->spinlock_lockval = arch_spin_lockval(0); #endif set_prefix((u32)(unsigned long) lc); lowcore_ptr[0] = lc; } static struct resource code_resource = { .name = "Kernel code", .flags = IORESOURCE_BUSY | IORESOURCE_MEM, }; static struct resource data_resource = { .name = "Kernel data", .flags = IORESOURCE_BUSY | IORESOURCE_MEM, }; static struct resource bss_resource = { .name = "Kernel bss", .flags = IORESOURCE_BUSY | IORESOURCE_MEM, }; 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; struct memblock_region *reg; int j; 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_memblock(memory, reg) { res = alloc_bootmem_low(sizeof(*res)); res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; res->name = "System RAM"; res->start = reg->base; res->end = reg->base + reg->size - 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 = alloc_bootmem_low(sizeof(*sub_res)); *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); } } } } static void __init setup_memory_end(void) { unsigned long vmax, vmalloc_size, tmp; /* Choose kernel address space layout: 2, 3, or 4 levels. */ vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; tmp = tmp * (sizeof(struct page) + PAGE_SIZE); if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) vmax = 1UL << 42; /* 3-level kernel page table */ else vmax = 1UL << 53; /* 4-level kernel page table */ /* module area is at the end of the kernel address space. */ MODULES_END = vmax; MODULES_VADDR = MODULES_END - MODULES_LEN; VMALLOC_END = MODULES_VADDR; VMALLOC_START = vmax - 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 memory_end is set and <= vmemmap */ memory_end = min(memory_end ?: max_physmem_end, tmp); max_pfn = max_low_pfn = PFN_DOWN(memory_end); memblock_remove(memory_end, ULONG_MAX); pr_notice("Max memory size: %luMB\n", memory_end >> 20); } static void __init setup_vmcoreinfo(void) { mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); } #ifdef CONFIG_CRASH_DUMP /* * When kdump is enabled, we have to ensure that no memory from * the area [0 - crashkernel memory size] and * [crashk_res.start - crashk_res.end] is set offline. */ 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; if (arg->start_pfn > PFN_DOWN(crashk_res.end)) return NOTIFY_OK; if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) return NOTIFY_OK; return NOTIFY_BAD; } static struct notifier_block kdump_mem_nb = { .notifier_call = kdump_mem_notifier, }; #endif /* * Make sure that the area behind memory_end is protected */ static void reserve_memory_end(void) { #ifdef CONFIG_CRASH_DUMP if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE && sclp.hsa_size) { memory_end = sclp.hsa_size; memory_end &= PAGE_MASK; memory_end_set = 1; } #endif if (!memory_end_set) return; memblock_reserve(memory_end, ULONG_MAX); } /* * Make sure that oldmem, where the dump is stored, is protected */ static void 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 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, memory_end, &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; insert_resource(&iomem_resource, &crashk_res); 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 initrd_start = INITRD_START; initrd_end = initrd_start + INITRD_SIZE; memblock_reserve(INITRD_START, INITRD_SIZE); #endif } /* * 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("initrd does not fit 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)); #ifdef CONFIG_DMA_API_DEBUG /* * DMA_API_DEBUG code stumbles over addresses from the * range [_ehead, _stext]. Mark the memory as reserved * so it is not used for CONFIG_DMA_API_DEBUG=y. */ memblock_reserve(0, PFN_PHYS(start_pfn)); #else memblock_reserve(0, (unsigned long)_ehead); memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) - (unsigned long)_stext); #endif } static void __init reserve_elfcorehdr(void) { #ifdef CONFIG_CRASH_DUMP if (is_kdump_kernel()) memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, PAGE_ALIGN(elfcorehdr_size)); #endif } static void __init setup_memory(void) { struct memblock_region *reg; /* * Init storage key for present memory */ for_each_memblock(memory, reg) { storage_key_init_range(reg->base, reg->base + reg->size); } psw_set_key(PAGE_DEFAULT_KEY); /* Only cosmetics */ memblock_enforce_memory_limit(memblock_end_of_DRAM()); } /* * Setup hardware capabilities. */ static void __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_HPAGE) 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 (test_facility(50) && test_facility(73)) elf_hwcap |= HWCAP_S390_TE; /* * Vector extension HWCAP_S390_VXRS is bit 11. */ if (test_facility(129)) elf_hwcap |= HWCAP_S390_VXRS; get_cpu_id(&cpu_id); add_device_randomness(&cpu_id, sizeof(cpu_id)); switch (cpu_id.machine) { case 0x9672: strcpy(elf_platform, "g5"); break; 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: strcpy(elf_platform, "z13"); break; } } /* * Add system information as device randomness */ static void __init setup_randomness(void) { struct sysinfo_3_2_2 *vmms; vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) add_device_randomness(&vmms, vmms->count); free_page((unsigned long) vmms); } /* * 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"); /* 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; /* Is init_mm really needed? */ init_mm.start_code = PAGE_OFFSET; init_mm.end_code = (unsigned long) &_etext; init_mm.end_data = (unsigned long) &_edata; init_mm.brk = (unsigned long) &_end; parse_early_param(); os_info_init(); setup_ipl(); /* Do some memory reservations *before* memory is added to memblock */ reserve_memory_end(); reserve_oldmem(); reserve_kernel(); reserve_initrd(); reserve_elfcorehdr(); memblock_allow_resize(); /* Get information about *all* installed memory */ detect_memory_memblock(); remove_oldmem(); /* * Make sure all chunks are MAX_ORDER aligned so we don't need the * extra checks that HOLES_IN_ZONE would require. * * Is this still required? */ memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); setup_memory_end(); setup_memory(); check_initrd(); reserve_crashkernel(); setup_resources(); setup_vmcoreinfo(); setup_lowcore(); smp_fill_possible_mask(); cpu_init(); /* * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). */ setup_hwcaps(); /* * Create kernel page tables and switch to virtual addressing. */ paging_init(); /* Setup default console */ conmode_default(); set_preferred_console(); /* Setup zfcpdump support */ setup_zfcpdump(); /* Add system specific data to the random pool */ setup_randomness(); }