// 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 <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 <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/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/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); 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 <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("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_DUMPstatic 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;}#elsestatic 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 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); old = S390_lowcore.mcck_stack - STACK_INIT_OFFSET; new = stack_alloc(); if (!new) panic("Couldn't allocate machine check stack"); WRITE_ONCE(S390_lowcore.mcck_stack, new + STACK_INIT_OFFSET); memblock_free_late(old, THREAD_SIZE); return 0;}early_initcall(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; unsigned long mcck_stack; 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; 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; /* 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,Lines 1–500 of 1208. 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// 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 <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 <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/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/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); 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 <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("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 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); old = S390_lowcore.mcck_stack - STACK_INIT_OFFSET; new = stack_alloc(); if (!new) panic("Couldn't allocate machine check stack"); WRITE_ONCE(S390_lowcore.mcck_stack, new + STACK_INIT_OFFSET); memblock_free_late(old, THREAD_SIZE); return 0; } early_initcall(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; unsigned long mcck_stack; 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; 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; /* 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,