f6c2e3330d
We should zap the low mappings, as soon as possible, so that we can catch kernel bugs more effectively. Previously early boot had NULL mapped and didn't trap on NULL references. This patch introduces boot_level4_pgt, which will always have low identity addresses mapped. Druing boot, all the processors will use this as their level4 pgt. On BP, we will switch to init_level4_pgt as soon as we enter C code and zap the low mappings as soon as we are done with the usage of identity low mapped addresses. On AP's we will zap the low mappings as soon as we jump to C code. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
#ifndef _ASM_X8664_PROTO_H
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#define _ASM_X8664_PROTO_H 1
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#include <asm/ldt.h>
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/* misc architecture specific prototypes */
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struct cpuinfo_x86;
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struct pt_regs;
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extern void start_kernel(void);
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extern void pda_init(int);
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extern void zap_low_mappings(int cpu);
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extern void early_idt_handler(void);
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extern void mcheck_init(struct cpuinfo_x86 *c);
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#ifdef CONFIG_MTRR
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extern void mtrr_ap_init(void);
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extern void mtrr_bp_init(void);
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#else
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#define mtrr_ap_init() do {} while (0)
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#define mtrr_bp_init() do {} while (0)
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#endif
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extern void init_memory_mapping(unsigned long start, unsigned long end);
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extern void size_zones(unsigned long *z, unsigned long *h,
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unsigned long start_pfn, unsigned long end_pfn);
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extern void system_call(void);
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extern int kernel_syscall(void);
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extern void syscall_init(void);
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extern void ia32_syscall(void);
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extern void ia32_cstar_target(void);
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extern void ia32_sysenter_target(void);
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extern void config_acpi_tables(void);
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extern void ia32_syscall(void);
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extern void iommu_hole_init(void);
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extern void time_init_gtod(void);
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extern int pmtimer_mark_offset(void);
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extern unsigned int do_gettimeoffset_pm(void);
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extern u32 pmtmr_ioport;
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extern unsigned long long monotonic_base;
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extern int sysctl_vsyscall;
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extern void do_softirq_thunk(void);
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extern int numa_setup(char *opt);
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extern int setup_early_printk(char *);
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extern void early_printk(const char *fmt, ...) __attribute__((format(printf,1,2)));
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extern void early_identify_cpu(struct cpuinfo_x86 *c);
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extern int k8_scan_nodes(unsigned long start, unsigned long end);
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extern void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
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extern unsigned long numa_free_all_bootmem(void);
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extern void reserve_bootmem_generic(unsigned long phys, unsigned len);
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extern void free_bootmem_generic(unsigned long phys, unsigned len);
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extern void load_gs_index(unsigned gs);
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extern unsigned long end_pfn_map;
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extern cpumask_t cpu_initialized;
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extern void show_trace(unsigned long * rsp);
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extern void show_registers(struct pt_regs *regs);
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extern void exception_table_check(void);
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extern void acpi_reserve_bootmem(void);
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extern void swap_low_mappings(void);
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extern void __show_regs(struct pt_regs * regs);
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extern void show_regs(struct pt_regs * regs);
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extern char *syscall32_page;
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extern void syscall32_cpu_init(void);
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extern void setup_node_bootmem(int nodeid, unsigned long start, unsigned long end);
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extern void check_ioapic(void);
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extern void check_efer(void);
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extern int unhandled_signal(struct task_struct *tsk, int sig);
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extern void select_idle_routine(const struct cpuinfo_x86 *c);
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extern void swiotlb_init(void);
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extern unsigned long table_start, table_end;
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extern int exception_trace;
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extern int force_iommu, no_iommu;
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extern int using_apic_timer;
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extern int disable_apic;
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extern unsigned cpu_khz;
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extern int ioapic_force;
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extern int skip_ioapic_setup;
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extern int acpi_ht;
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extern int acpi_disabled;
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extern int fallback_aper_order;
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extern int fallback_aper_force;
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extern int iommu_aperture;
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extern int iommu_aperture_disabled;
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extern int iommu_aperture_allowed;
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extern int fix_aperture;
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extern int force_iommu;
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extern int reboot_force;
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extern void smp_local_timer_interrupt(struct pt_regs * regs);
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long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);
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#define round_up(x,y) (((x) + (y) - 1) & ~((y)-1))
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#define round_down(x,y) ((x) & ~((y)-1))
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#endif
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