mirror of https://gitee.com/openkylin/linux.git
x86: cpu/common*.c, make 32-bit have 64-bit only functions
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
Ingo Molnar
parent
ba51dced0b
commit
d5494d4f51
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@ -750,6 +750,143 @@ __setup("clearcpuid=", setup_disablecpuid);
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cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
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#ifdef CONFIG_X86_64
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struct x8664_pda **_cpu_pda __read_mostly;
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EXPORT_SYMBOL(_cpu_pda);
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struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table };
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char boot_cpu_stack[IRQSTACKSIZE] __page_aligned_bss;
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unsigned long __supported_pte_mask __read_mostly = ~0UL;
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EXPORT_SYMBOL_GPL(__supported_pte_mask);
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static int do_not_nx __cpuinitdata;
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/* noexec=on|off
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Control non executable mappings for 64bit processes.
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on Enable(default)
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off Disable
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*/
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static int __init nonx_setup(char *str)
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{
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if (!str)
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return -EINVAL;
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if (!strncmp(str, "on", 2)) {
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__supported_pte_mask |= _PAGE_NX;
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do_not_nx = 0;
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} else if (!strncmp(str, "off", 3)) {
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do_not_nx = 1;
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__supported_pte_mask &= ~_PAGE_NX;
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}
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return 0;
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}
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early_param("noexec", nonx_setup);
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int force_personality32;
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/* noexec32=on|off
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Control non executable heap for 32bit processes.
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To control the stack too use noexec=off
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on PROT_READ does not imply PROT_EXEC for 32bit processes (default)
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off PROT_READ implies PROT_EXEC
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*/
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static int __init nonx32_setup(char *str)
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{
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if (!strcmp(str, "on"))
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force_personality32 &= ~READ_IMPLIES_EXEC;
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else if (!strcmp(str, "off"))
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force_personality32 |= READ_IMPLIES_EXEC;
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return 1;
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}
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__setup("noexec32=", nonx32_setup);
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void pda_init(int cpu)
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{
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struct x8664_pda *pda = cpu_pda(cpu);
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/* Setup up data that may be needed in __get_free_pages early */
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loadsegment(fs, 0);
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loadsegment(gs, 0);
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/* Memory clobbers used to order PDA accessed */
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mb();
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wrmsrl(MSR_GS_BASE, pda);
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mb();
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pda->cpunumber = cpu;
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pda->irqcount = -1;
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pda->kernelstack = (unsigned long)stack_thread_info() -
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PDA_STACKOFFSET + THREAD_SIZE;
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pda->active_mm = &init_mm;
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pda->mmu_state = 0;
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if (cpu == 0) {
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/* others are initialized in smpboot.c */
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pda->pcurrent = &init_task;
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pda->irqstackptr = boot_cpu_stack;
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pda->irqstackptr += IRQSTACKSIZE - 64;
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} else {
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if (!pda->irqstackptr) {
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pda->irqstackptr = (char *)
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__get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER);
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if (!pda->irqstackptr)
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panic("cannot allocate irqstack for cpu %d",
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cpu);
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pda->irqstackptr += IRQSTACKSIZE - 64;
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}
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if (pda->nodenumber == 0 && cpu_to_node(cpu) != NUMA_NO_NODE)
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pda->nodenumber = cpu_to_node(cpu);
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}
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}
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char boot_exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ +
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DEBUG_STKSZ] __page_aligned_bss;
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extern asmlinkage void ignore_sysret(void);
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/* May not be marked __init: used by software suspend */
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void syscall_init(void)
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{
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/*
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* LSTAR and STAR live in a bit strange symbiosis.
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* They both write to the same internal register. STAR allows to
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* set CS/DS but only a 32bit target. LSTAR sets the 64bit rip.
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*/
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wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32);
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wrmsrl(MSR_LSTAR, system_call);
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wrmsrl(MSR_CSTAR, ignore_sysret);
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#ifdef CONFIG_IA32_EMULATION
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syscall32_cpu_init();
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#endif
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/* Flags to clear on syscall */
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wrmsrl(MSR_SYSCALL_MASK,
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X86_EFLAGS_TF|X86_EFLAGS_DF|X86_EFLAGS_IF|X86_EFLAGS_IOPL);
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}
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void __cpuinit check_efer(void)
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{
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unsigned long efer;
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rdmsrl(MSR_EFER, efer);
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if (!(efer & EFER_NX) || do_not_nx)
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__supported_pte_mask &= ~_PAGE_NX;
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}
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unsigned long kernel_eflags;
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/*
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* Copies of the original ist values from the tss are only accessed during
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* debugging, no special alignment required.
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*/
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DEFINE_PER_CPU(struct orig_ist, orig_ist);
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#else
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/* Make sure %fs is initialized properly in idle threads */
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struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
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{
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@ -757,6 +894,7 @@ struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
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regs->fs = __KERNEL_PERCPU;
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return regs;
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}
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#endif
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/*
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* cpu_init() initializes state that is per-CPU. Some data is already
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@ -704,6 +704,7 @@ __setup("clearcpuid=", setup_disablecpuid);
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cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
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#ifdef CONFIG_X86_64
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struct x8664_pda **_cpu_pda __read_mostly;
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EXPORT_SYMBOL(_cpu_pda);
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@ -838,6 +839,17 @@ unsigned long kernel_eflags;
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*/
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DEFINE_PER_CPU(struct orig_ist, orig_ist);
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#else
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/* Make sure %fs is initialized properly in idle threads */
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struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
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{
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memset(regs, 0, sizeof(struct pt_regs));
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regs->fs = __KERNEL_PERCPU;
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return regs;
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}
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#endif
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/*
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* cpu_init() initializes state that is per-CPU. Some data is already
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* initialized (naturally) in the bootstrap process, such as the GDT
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