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- // SPDX-License-Identifier: GPL-2.0
- /*
- * S390 version
- * Copyright IBM Corp. 1999, 2012
- * Author(s): Hartmut Penner ([email protected]),
- * Martin Schwidefsky ([email protected])
- *
- * 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 <linux/errno.h>
- #include <linux/export.h>
- #include <linux/sched.h>
- #include <linux/sched/task.h>
- #include <linux/cpu.h>
- #include <linux/kernel.h>
- #include <linux/memblock.h>
- #include <linux/mm.h>
- #include <linux/stddef.h>
- #include <linux/unistd.h>
- #include <linux/ptrace.h>
- #include <linux/random.h>
- #include <linux/user.h>
- #include <linux/tty.h>
- #include <linux/ioport.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/initrd.h>
- #include <linux/root_dev.h>
- #include <linux/console.h>
- #include <linux/kernel_stat.h>
- #include <linux/dma-map-ops.h>
- #include <linux/device.h>
- #include <linux/notifier.h>
- #include <linux/pfn.h>
- #include <linux/ctype.h>
- #include <linux/reboot.h>
- #include <linux/topology.h>
- #include <linux/kexec.h>
- #include <linux/crash_dump.h>
- #include <linux/memory.h>
- #include <linux/compat.h>
- #include <linux/start_kernel.h>
- #include <linux/hugetlb.h>
- #include <linux/kmemleak.h>
- #include <asm/boot_data.h>
- #include <asm/ipl.h>
- #include <asm/facility.h>
- #include <asm/smp.h>
- #include <asm/mmu_context.h>
- #include <asm/cpcmd.h>
- #include <asm/abs_lowcore.h>
- #include <asm/nmi.h>
- #include <asm/irq.h>
- #include <asm/page.h>
- #include <asm/ptrace.h>
- #include <asm/sections.h>
- #include <asm/ebcdic.h>
- #include <asm/diag.h>
- #include <asm/os_info.h>
- #include <asm/sclp.h>
- #include <asm/stacktrace.h>
- #include <asm/sysinfo.h>
- #include <asm/numa.h>
- #include <asm/alternative.h>
- #include <asm/nospec-branch.h>
- #include <asm/mem_detect.h>
- #include <asm/maccess.h>
- #include <asm/uv.h>
- #include <asm/asm-offsets.h>
- #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);
- /*
- * Some code and data needs to stay below 2 GB, even when the kernel would be
- * relocated above 2 GB, because it has to use 31 bit addresses.
- * Such code and data is part of the .amode31 section.
- */
- unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
- unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
- unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
- unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
- struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
- struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
- /*
- * Control registers CR2, CR5 and CR15 are initialized with addresses
- * of tables that must be placed below 2G which is handled by the AMODE31
- * sections.
- * Because the AMODE31 sections are relocated below 2G at startup,
- * the content of control registers CR2, CR5 and CR15 must be updated
- * with new addresses after the relocation. The initial initialization of
- * control registers occurs in head64.S and then gets updated again after AMODE31
- * relocation. We must access the relevant AMODE31 tables indirectly via
- * pointers placed in the .amode31.refs linker section. Those pointers get
- * updated automatically during AMODE31 relocation and always contain a valid
- * address within AMODE31 sections.
- */
- static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
- static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
- [1] = 0xffffffffffffffff
- };
- static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0,
- 0x80000000, 0, 0, 0
- };
- static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
- 0, 0, 0x89000000, 0,
- 0, 0, 0x8a000000, 0
- };
- static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
- static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
- static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
- static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
- int __bootdata(noexec_disabled);
- unsigned long __bootdata(ident_map_size);
- struct mem_detect_info __bootdata(mem_detect);
- struct initrd_data __bootdata(initrd_data);
- unsigned long __bootdata_preserved(__kaslr_offset);
- unsigned long __bootdata(__amode31_base);
- unsigned int __bootdata_preserved(zlib_dfltcc_support);
- EXPORT_SYMBOL(zlib_dfltcc_support);
- u64 __bootdata_preserved(stfle_fac_list[16]);
- EXPORT_SYMBOL(stfle_fac_list);
- u64 __bootdata_preserved(alt_stfle_fac_list[16]);
- struct oldmem_data __bootdata_preserved(oldmem_data);
- 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);
- DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
- /*
- * 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 <asm/setup.h>
- /*
- * 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("ttysclp", 0, 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_data.start)
- 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
- void *ret;
- ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
- NUMA_NO_NODE, __builtin_return_address(0));
- kmemleak_not_leak(ret);
- return (unsigned long)ret;
- #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;
- }
- void __init arch_call_rest_init(void)
- {
- unsigned long stack;
- smp_reinit_ipl_cpu();
- 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 *abs_lc, *lc;
- unsigned long mcck_stack;
- unsigned long flags;
- 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;
- nmi_alloc_mcesa_early(&lc->mcesad);
- 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 = -1U;
- abs_lc = get_abs_lowcore(&flags);
- abs_lc->restart_stack = lc->restart_stack;
- abs_lc->restart_fn = lc->restart_fn;
- abs_lc->restart_data = lc->restart_data;
- abs_lc->restart_source = lc->restart_source;
- abs_lc->restart_psw = lc->restart_psw;
- abs_lc->mcesad = lc->mcesad;
- put_abs_lowcore(abs_lc, flags);
- mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
- if (!mcck_stack)
- panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
- __func__, THREAD_SIZE, THREAD_SIZE);
- lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
- lc->spinlock_lockval = arch_spin_lockval(0);
- lc->spinlock_index = 0;
- arch_spin_lock_setup(0);
- lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
- lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
- lc->preempt_count = PREEMPT_DISABLED;
- set_prefix(__pa(lc));
- lowcore_ptr[0] = lc;
- }
- static void __init setup_lowcore_dat_on(void)
- {
- struct lowcore *abs_lc;
- unsigned long flags;
- int i;
- __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);
- __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
- if (abs_lowcore_map(0, lowcore_ptr[0], true))
- panic("Couldn't setup absolute lowcore");
- abs_lowcore_mapped = true;
- abs_lc = get_abs_lowcore(&flags);
- abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
- abs_lc->program_new_psw = S390_lowcore.program_new_psw;
- for (i = 0; i < 16; i++)
- abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i];
- put_abs_lowcore(abs_lc, flags);
- }
- 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_NONE);
- memblock_reserve(crashk_res.start, resource_size(&crashk_res));
- insert_resource(&iomem_resource, &crashk_res);
- }
- #endif
- }
- static void __init setup_memory_end(void)
- {
- memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size);
- max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
- 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
- /*
- * 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_data.start;
- high = low + crash_size;
- if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.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_phys_alloc_range(crash_size,
- KEXEC_CRASH_MEM_ALIGN,
- low, high);
- }
- if (!crash_base) {
- pr_info("crashkernel reservation failed: %s\n",
- "no suitable area found");
- return;
- }
- if (register_memory_notifier(&kdump_mem_nb)) {
- memblock_phys_free(crash_base, crash_size);
- return;
- }
- if (!oldmem_data.start && 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_data.start || !initrd_data.size)
- return;
- initrd_start = (unsigned long)__va(initrd_data.start);
- initrd_end = initrd_start + initrd_data.size;
- memblock_reserve(initrd_data.start, initrd_data.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_phys_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);
- }
- /*
- * Check for initrd being in usable memory
- */
- static void __init check_initrd(void)
- {
- #ifdef CONFIG_BLK_DEV_INITRD
- if (initrd_data.start && initrd_data.size &&
- !memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
- pr_err("The initial RAM disk does not fit into the memory\n");
- memblock_phys_free(initrd_data.start, initrd_data.size);
- initrd_start = initrd_end = 0;
- }
- #endif
- }
- /*
- * Reserve memory used for lowcore/command line/kernel image.
- */
- static void __init reserve_kernel(void)
- {
- memblock_reserve(0, STARTUP_NORMAL_OFFSET);
- memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
- memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
- memblock_reserve(__amode31_base, __eamode31 - __samode31);
- memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
- memblock_reserve(__pa(_stext), _end - _stext);
- }
- 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);
- }
- static void __init relocate_amode31_section(void)
- {
- unsigned long amode31_size = __eamode31 - __samode31;
- long amode31_offset = __amode31_base - __samode31;
- long *ptr;
- pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
- /* Move original AMODE31 section to the new one */
- memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
- /* Zero out the old AMODE31 section to catch invalid accesses within it */
- memset((void *)__samode31, 0, amode31_size);
- /* Update all AMODE31 region references */
- for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
- *ptr += amode31_offset;
- }
- /* This must be called after AMODE31 relocation */
- static void __init setup_cr(void)
- {
- union ctlreg2 cr2;
- union ctlreg5 cr5;
- union ctlreg15 cr15;
- __ctl_duct[1] = (unsigned long)__ctl_aste;
- __ctl_duct[2] = (unsigned long)__ctl_aste;
- __ctl_duct[4] = (unsigned long)__ctl_duald;
- /* Update control registers CR2, CR5 and CR15 */
- __ctl_store(cr2.val, 2, 2);
- __ctl_store(cr5.val, 5, 5);
- __ctl_store(cr15.val, 15, 15);
- cr2.ducto = (unsigned long)__ctl_duct >> 6;
- cr5.pasteo = (unsigned long)__ctl_duct >> 6;
- cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
- __ctl_load(cr2.val, 2, 2);
- __ctl_load(cr5.val, 5, 5);
- __ctl_load(cr15.val, 15, 15);
- }
- /*
- * Add system information as device randomness
- */
- static void __init setup_randomness(void)
- {
- struct sysinfo_3_2_2 *vmms;
- vmms = memblock_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(vmms, PAGE_SIZE);
- if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
- static_branch_enable(&s390_arch_random_available);
- }
- /*
- * 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;
- setup_initial_init_mm(_text, _etext, _edata, _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_kernel();
- reserve_initrd();
- reserve_certificate_list();
- reserve_mem_detect_info();
- memblock_set_current_limit(ident_map_size);
- memblock_allow_resize();
- /* Get information about *all* installed memory */
- memblock_add_mem_detect_info();
- free_mem_detect_info();
- setup_memory_end();
- memblock_dump_all();
- setup_memory();
- relocate_amode31_section();
- setup_cr();
- setup_uv();
- 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_secondary_cpus() triggers a system reset.
- * Therefore CPU and device initialization should be done afterwards.
- */
- smp_save_dump_secondary_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();
- if (test_facility(193))
- static_branch_enable(&cpu_has_bear);
- /*
- * Create kernel page tables and switch to virtual addressing.
- */
- paging_init();
- memcpy_real_init();
- /*
- * After paging_init created the kernel page table, the new PSWs
- * in lowcore can now run with DAT enabled.
- */
- setup_lowcore_dat_on();
- #ifdef CONFIG_CRASH_DUMP
- smp_save_dump_ipl_cpu();
- #endif
- /* 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();
- }
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