mirror of https://gitee.com/openkylin/linux.git
294 lines
7.1 KiB
C
294 lines
7.1 KiB
C
/*
|
|
* X86-64 specific CPU setup.
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* Copyright 2001, 2002, 2003 SuSE Labs / Andi Kleen.
|
|
* See setup.c for older changelog.
|
|
* $Id: setup64.c,v 1.12 2002/03/21 10:09:17 ak Exp $
|
|
*/
|
|
#include <linux/config.h>
|
|
#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 <asm/bootsetup.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/mtrr.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/mman.h>
|
|
#include <asm/numa.h>
|
|
|
|
char x86_boot_params[BOOT_PARAM_SIZE] __initdata = {0,};
|
|
|
|
cpumask_t cpu_initialized __initdata = CPU_MASK_NONE;
|
|
|
|
struct x8664_pda cpu_pda[NR_CPUS] __cacheline_aligned;
|
|
|
|
extern struct task_struct init_task;
|
|
|
|
extern unsigned char __per_cpu_start[], __per_cpu_end[];
|
|
|
|
extern struct desc_ptr cpu_gdt_descr[];
|
|
struct desc_ptr idt_descr = { 256 * 16, (unsigned long) idt_table };
|
|
|
|
char boot_cpu_stack[IRQSTACKSIZE] __attribute__((section(".bss.page_aligned")));
|
|
|
|
unsigned long __supported_pte_mask = ~0UL;
|
|
static int do_not_nx __initdata = 0;
|
|
|
|
/* noexec=on|off
|
|
Control non executable mappings for 64bit processes.
|
|
|
|
on Enable(default)
|
|
off Disable
|
|
*/
|
|
int __init nonx_setup(char *str)
|
|
{
|
|
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;
|
|
}
|
|
__setup("noexec=", nonx_setup); /* parsed early actually */
|
|
|
|
int force_personality32 = READ_IMPLIES_EXEC;
|
|
|
|
/* 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 0;
|
|
}
|
|
__setup("noexec32=", nonx32_setup);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/* Copy section for each CPU (we discard the original) */
|
|
size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
|
|
#ifdef CONFIG_MODULES
|
|
if (size < PERCPU_ENOUGH_ROOM)
|
|
size = PERCPU_ENOUGH_ROOM;
|
|
#endif
|
|
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
unsigned char *ptr;
|
|
|
|
if (!NODE_DATA(cpu_to_node(i))) {
|
|
printk("cpu with no node %d, num_online_nodes %d\n",
|
|
i, num_online_nodes());
|
|
ptr = alloc_bootmem(size);
|
|
} else {
|
|
ptr = alloc_bootmem_node(NODE_DATA(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);
|
|
}
|
|
}
|
|
|
|
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));
|
|
wrmsrl(MSR_GS_BASE, cpu_pda + cpu);
|
|
|
|
pda->me = pda;
|
|
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);
|
|
}
|
|
|
|
asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
|
|
|
|
pda->irqstackptr += IRQSTACKSIZE-64;
|
|
}
|
|
|
|
char boot_exception_stacks[N_EXCEPTION_STACKS * EXCEPTION_STKSZ]
|
|
__attribute__((section(".bss.page_aligned")));
|
|
|
|
/* 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);
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
syscall32_cpu_init ();
|
|
#endif
|
|
|
|
/* Flags to clear on syscall */
|
|
wrmsrl(MSR_SYSCALL_MASK, EF_TF|EF_DF|EF_IE|0x3000);
|
|
}
|
|
|
|
void __init check_efer(void)
|
|
{
|
|
unsigned long efer;
|
|
|
|
rdmsrl(MSR_EFER, efer);
|
|
if (!(efer & EFER_NX) || do_not_nx) {
|
|
__supported_pte_mask &= ~_PAGE_NX;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 __init cpu_init (void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
int cpu = stack_smp_processor_id();
|
|
#else
|
|
int cpu = smp_processor_id();
|
|
#endif
|
|
struct tss_struct *t = &per_cpu(init_tss, 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(cpu_gdt_table[cpu], cpu_gdt_table[0], GDT_SIZE);
|
|
}
|
|
|
|
cpu_gdt_descr[cpu].size = GDT_SIZE;
|
|
cpu_gdt_descr[cpu].address = (unsigned long)cpu_gdt_table[cpu];
|
|
asm volatile("lgdt %0" :: "m" (cpu_gdt_descr[cpu]));
|
|
asm volatile("lidt %0" :: "m" (idt_descr));
|
|
|
|
memcpy(me->thread.tls_array, cpu_gdt_table[cpu], GDT_ENTRY_TLS_ENTRIES * 8);
|
|
|
|
/*
|
|
* Delete NT
|
|
*/
|
|
|
|
asm volatile("pushfq ; popq %%rax ; btr $14,%%rax ; pushq %%rax ; popfq" ::: "eax");
|
|
|
|
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++) {
|
|
if (cpu) {
|
|
estacks = (char *)__get_free_pages(GFP_ATOMIC,
|
|
EXCEPTION_STACK_ORDER);
|
|
if (!estacks)
|
|
panic("Cannot allocate exception stack %ld %d\n",
|
|
v, cpu);
|
|
}
|
|
estacks += EXCEPTION_STKSZ;
|
|
t->ist[v] = (unsigned long)estacks;
|
|
}
|
|
|
|
t->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_debug(0UL, 0);
|
|
set_debug(0UL, 1);
|
|
set_debug(0UL, 2);
|
|
set_debug(0UL, 3);
|
|
set_debug(0UL, 6);
|
|
set_debug(0UL, 7);
|
|
|
|
fpu_init();
|
|
}
|