| /* |
| * X86-64 specific CPU setup. |
| * Copyright (C) 1995 Linus Torvalds |
| * Copyright 2001, 2002, 2003 SuSE Labs / Andi Kleen. |
| * See setup.c for older changelog. |
| */ |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/bootmem.h> |
| #include <linux/bitops.h> |
| #include <linux/module.h> |
| #include <asm/pda.h> |
| #include <asm/pgtable.h> |
| #include <asm/processor.h> |
| #include <asm/desc.h> |
| #include <asm/atomic.h> |
| #include <asm/mmu_context.h> |
| #include <asm/smp.h> |
| #include <asm/i387.h> |
| #include <asm/percpu.h> |
| #include <asm/proto.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| |
| #ifndef CONFIG_DEBUG_BOOT_PARAMS |
| struct boot_params __initdata boot_params; |
| #else |
| struct boot_params boot_params; |
| #endif |
| |
| cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE; |
| |
| struct x8664_pda *_cpu_pda[NR_CPUS] __read_mostly; |
| EXPORT_SYMBOL(_cpu_pda); |
| struct x8664_pda boot_cpu_pda[NR_CPUS] __cacheline_aligned; |
| |
| struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table }; |
| |
| char boot_cpu_stack[IRQSTACKSIZE] __attribute__((section(".bss.page_aligned"))); |
| |
| unsigned long __supported_pte_mask __read_mostly = ~0UL; |
| static int do_not_nx __cpuinitdata = 0; |
| |
| /* noexec=on|off |
| Control non executable mappings for 64bit processes. |
| |
| on Enable(default) |
| off Disable |
| */ |
| static int __init nonx_setup(char *str) |
| { |
| if (!str) |
| return -EINVAL; |
| if (!strncmp(str, "on", 2)) { |
| __supported_pte_mask |= _PAGE_NX; |
| do_not_nx = 0; |
| } else if (!strncmp(str, "off", 3)) { |
| do_not_nx = 1; |
| __supported_pte_mask &= ~_PAGE_NX; |
| } |
| return 0; |
| } |
| early_param("noexec", nonx_setup); |
| |
| int force_personality32 = 0; |
| |
| /* noexec32=on|off |
| Control non executable heap for 32bit processes. |
| To control the stack too use noexec=off |
| |
| on PROT_READ does not imply PROT_EXEC for 32bit processes |
| off PROT_READ implies PROT_EXEC (default) |
| */ |
| static int __init nonx32_setup(char *str) |
| { |
| if (!strcmp(str, "on")) |
| force_personality32 &= ~READ_IMPLIES_EXEC; |
| else if (!strcmp(str, "off")) |
| force_personality32 |= READ_IMPLIES_EXEC; |
| return 1; |
| } |
| __setup("noexec32=", nonx32_setup); |
| |
| /* |
| * Copy data used in early init routines from the initial arrays to the |
| * per cpu data areas. These arrays then become expendable and the |
| * *_early_ptr's are zeroed indicating that the static arrays are gone. |
| */ |
| static void __init setup_per_cpu_maps(void) |
| { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| #ifdef CONFIG_SMP |
| if (per_cpu_offset(cpu)) { |
| #endif |
| per_cpu(x86_cpu_to_apicid, cpu) = |
| x86_cpu_to_apicid_init[cpu]; |
| per_cpu(x86_bios_cpu_apicid, cpu) = |
| x86_bios_cpu_apicid_init[cpu]; |
| #ifdef CONFIG_NUMA |
| per_cpu(x86_cpu_to_node_map, cpu) = |
| x86_cpu_to_node_map_init[cpu]; |
| #endif |
| #ifdef CONFIG_SMP |
| } |
| else |
| printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n", |
| cpu); |
| #endif |
| } |
| |
| /* indicate the early static arrays will soon be gone */ |
| x86_cpu_to_apicid_early_ptr = NULL; |
| x86_bios_cpu_apicid_early_ptr = NULL; |
| #ifdef CONFIG_NUMA |
| x86_cpu_to_node_map_early_ptr = NULL; |
| #endif |
| } |
| |
| /* |
| * Great future plan: |
| * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. |
| * Always point %gs to its beginning |
| */ |
| void __init setup_per_cpu_areas(void) |
| { |
| int i; |
| unsigned long size; |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| prefill_possible_map(); |
| #endif |
| |
| /* Copy section for each CPU (we discard the original) */ |
| size = PERCPU_ENOUGH_ROOM; |
| |
| printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", size); |
| for_each_cpu_mask (i, cpu_possible_map) { |
| char *ptr; |
| |
| if (!NODE_DATA(early_cpu_to_node(i))) { |
| printk("cpu with no node %d, num_online_nodes %d\n", |
| i, num_online_nodes()); |
| ptr = alloc_bootmem_pages(size); |
| } else { |
| ptr = alloc_bootmem_pages_node(NODE_DATA(early_cpu_to_node(i)), size); |
| } |
| if (!ptr) |
| panic("Cannot allocate cpu data for CPU %d\n", i); |
| cpu_pda(i)->data_offset = ptr - __per_cpu_start; |
| memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
| } |
| |
| /* setup percpu data maps early */ |
| setup_per_cpu_maps(); |
| } |
| |
| void pda_init(int cpu) |
| { |
| struct x8664_pda *pda = cpu_pda(cpu); |
| |
| /* Setup up data that may be needed in __get_free_pages early */ |
| asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0)); |
| /* Memory clobbers used to order PDA accessed */ |
| mb(); |
| wrmsrl(MSR_GS_BASE, pda); |
| mb(); |
| |
| pda->cpunumber = cpu; |
| pda->irqcount = -1; |
| pda->kernelstack = |
| (unsigned long)stack_thread_info() - PDA_STACKOFFSET + THREAD_SIZE; |
| pda->active_mm = &init_mm; |
| pda->mmu_state = 0; |
| |
| if (cpu == 0) { |
| /* others are initialized in smpboot.c */ |
| pda->pcurrent = &init_task; |
| pda->irqstackptr = boot_cpu_stack; |
| } else { |
| pda->irqstackptr = (char *) |
| __get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER); |
| if (!pda->irqstackptr) |
| panic("cannot allocate irqstack for cpu %d", cpu); |
| } |
| |
| |
| pda->irqstackptr += IRQSTACKSIZE-64; |
| } |
| |
| char boot_exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ] |
| __attribute__((section(".bss.page_aligned"))); |
| |
| extern asmlinkage void ignore_sysret(void); |
| |
| /* May not be marked __init: used by software suspend */ |
| void syscall_init(void) |
| { |
| /* |
| * LSTAR and STAR live in a bit strange symbiosis. |
| * They both write to the same internal register. STAR allows to set CS/DS |
| * but only a 32bit target. LSTAR sets the 64bit rip. |
| */ |
| wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32); |
| wrmsrl(MSR_LSTAR, system_call); |
| wrmsrl(MSR_CSTAR, ignore_sysret); |
| |
| #ifdef CONFIG_IA32_EMULATION |
| syscall32_cpu_init (); |
| #endif |
| |
| /* Flags to clear on syscall */ |
| wrmsrl(MSR_SYSCALL_MASK, |
| X86_EFLAGS_TF|X86_EFLAGS_DF|X86_EFLAGS_IF|X86_EFLAGS_IOPL); |
| } |
| |
| void __cpuinit check_efer(void) |
| { |
| unsigned long efer; |
| |
| rdmsrl(MSR_EFER, efer); |
| if (!(efer & EFER_NX) || do_not_nx) { |
| __supported_pte_mask &= ~_PAGE_NX; |
| } |
| } |
| |
| unsigned long kernel_eflags; |
| |
| /* |
| * Copies of the original ist values from the tss are only accessed during |
| * debugging, no special alignment required. |
| */ |
| DEFINE_PER_CPU(struct orig_ist, orig_ist); |
| |
| /* |
| * cpu_init() initializes state that is per-CPU. Some data is already |
| * initialized (naturally) in the bootstrap process, such as the GDT |
| * and IDT. We reload them nevertheless, this function acts as a |
| * 'CPU state barrier', nothing should get across. |
| * A lot of state is already set up in PDA init. |
| */ |
| void __cpuinit cpu_init (void) |
| { |
| int cpu = stack_smp_processor_id(); |
| struct tss_struct *t = &per_cpu(init_tss, cpu); |
| struct orig_ist *orig_ist = &per_cpu(orig_ist, cpu); |
| unsigned long v; |
| char *estacks = NULL; |
| struct task_struct *me; |
| int i; |
| |
| /* CPU 0 is initialised in head64.c */ |
| if (cpu != 0) { |
| pda_init(cpu); |
| } else |
| estacks = boot_exception_stacks; |
| |
| me = current; |
| |
| if (cpu_test_and_set(cpu, cpu_initialized)) |
| panic("CPU#%d already initialized!\n", cpu); |
| |
| printk("Initializing CPU#%d\n", cpu); |
| |
| clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); |
| |
| /* |
| * Initialize the per-CPU GDT with the boot GDT, |
| * and set up the GDT descriptor: |
| */ |
| if (cpu) |
| memcpy(get_cpu_gdt_table(cpu), cpu_gdt_table, GDT_SIZE); |
| |
| cpu_gdt_descr[cpu].size = GDT_SIZE; |
| load_gdt((const struct desc_ptr *)&cpu_gdt_descr[cpu]); |
| load_idt((const struct desc_ptr *)&idt_descr); |
| |
| memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8); |
| syscall_init(); |
| |
| wrmsrl(MSR_FS_BASE, 0); |
| wrmsrl(MSR_KERNEL_GS_BASE, 0); |
| barrier(); |
| |
| check_efer(); |
| |
| /* |
| * set up and load the per-CPU TSS |
| */ |
| for (v = 0; v < N_EXCEPTION_STACKS; v++) { |
| static const unsigned int order[N_EXCEPTION_STACKS] = { |
| [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STACK_ORDER, |
| [DEBUG_STACK - 1] = DEBUG_STACK_ORDER |
| }; |
| if (cpu) { |
| estacks = (char *)__get_free_pages(GFP_ATOMIC, order[v]); |
| if (!estacks) |
| panic("Cannot allocate exception stack %ld %d\n", |
| v, cpu); |
| } |
| estacks += PAGE_SIZE << order[v]; |
| orig_ist->ist[v] = t->x86_tss.ist[v] = (unsigned long)estacks; |
| } |
| |
| t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap); |
| /* |
| * <= is required because the CPU will access up to |
| * 8 bits beyond the end of the IO permission bitmap. |
| */ |
| for (i = 0; i <= IO_BITMAP_LONGS; i++) |
| t->io_bitmap[i] = ~0UL; |
| |
| atomic_inc(&init_mm.mm_count); |
| me->active_mm = &init_mm; |
| if (me->mm) |
| BUG(); |
| enter_lazy_tlb(&init_mm, me); |
| |
| set_tss_desc(cpu, t); |
| load_TR_desc(); |
| load_LDT(&init_mm.context); |
| |
| /* |
| * Clear all 6 debug registers: |
| */ |
| |
| set_debugreg(0UL, 0); |
| set_debugreg(0UL, 1); |
| set_debugreg(0UL, 2); |
| set_debugreg(0UL, 3); |
| set_debugreg(0UL, 6); |
| set_debugreg(0UL, 7); |
| |
| fpu_init(); |
| |
| raw_local_save_flags(kernel_eflags); |
| } |