Release 4.14 arch/x86/include/asm/desc.h

Directory: arch/x86/include/asm
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_DESC_H

#define _ASM_X86_DESC_H

#include <asm/desc_defs.h>
#include <asm/ldt.h>
#include <asm/mmu.h>
#include <asm/fixmap.h>
#include <asm/irq_vectors.h>

#include <linux/smp.h>
#include <linux/percpu.h>



static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *info)
{
	desc->limit0		= info->limit & 0x0ffff;

	desc->base0		= (info->base_addr & 0x0000ffff);
	desc->base1		= (info->base_addr & 0x00ff0000) >> 16;

	desc->type		= (info->read_exec_only ^ 1) << 1;
	desc->type	       |= info->contents << 2;

	desc->s			= 1;
	desc->dpl		= 0x3;
	desc->p			= info->seg_not_present ^ 1;
	desc->limit1		= (info->limit & 0xf0000) >> 16;
	desc->avl		= info->useable;
	desc->d			= info->seg_32bit;
	desc->g			= info->limit_in_pages;

	desc->base2		= (info->base_addr & 0xff000000) >> 24;
	/*
         * Don't allow setting of the lm bit. It would confuse
         * user_64bit_mode and would get overridden by sysret anyway.
         */
	desc->l			= 0;
}

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Glauber de Oliveira Costa 148 93.08% 1 16.67%
Jeremy Fitzhardinge 6 3.77% 1 16.67%
Ingo Molnar 2 1.26% 1 16.67%
Thomas Gleixner 1 0.63% 1 16.67%
Roland McGrath 1 0.63% 1 16.67%
Andrew Lutomirski 1 0.63% 1 16.67%
Total 159 100.00% 6 100.00%

extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
extern const struct desc_ptr debug_idt_descr;
extern gate_desc debug_idt_table[];


struct gdt_page {
	
struct desc_struct gdt[GDT_ENTRIES];
} __attribute__((aligned(PAGE_SIZE)));

DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);

/* Provide the original GDT */


static inline struct desc_struct *get_cpu_gdt_rw(unsigned int cpu)
{
	return per_cpu(gdt_page, cpu).gdt;
}

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Glauber de Oliveira Costa 22 95.65% 2 66.67%
Thomas Garnier 1 4.35% 1 33.33%
Total 23 100.00% 3 100.00%

/* Provide the current original GDT */


static inline struct desc_struct *get_current_gdt_rw(void)
{
	return this_cpu_ptr(&gdt_page)->gdt;
}

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Thomas Garnier 20 100.00% 1 100.00%
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/* Get the fixmap index for a specific processor */


static inline unsigned int get_cpu_gdt_ro_index(int cpu)
{
	return FIX_GDT_REMAP_BEGIN + cpu;
}

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Thomas Garnier 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%

/* Provide the fixmap address of the remapped GDT */


static inline struct desc_struct *get_cpu_gdt_ro(int cpu)
{
	unsigned int idx = get_cpu_gdt_ro_index(cpu);
	return (struct desc_struct *)__fix_to_virt(idx);
}

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Thomas Garnier 32 100.00% 1 100.00%
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/* Provide the current read-only GDT */


static inline struct desc_struct *get_current_gdt_ro(void)
{
	return get_cpu_gdt_ro(smp_processor_id());
}

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Thomas Garnier 18 100.00% 1 100.00%
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/* Provide the physical address of the GDT page. */


static inline phys_addr_t get_cpu_gdt_paddr(unsigned int cpu)
{
	return per_cpu_ptr_to_phys(get_cpu_gdt_rw(cpu));
}

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Total 20 100.00% 1 100.00%



static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
			     unsigned dpl, unsigned ist, unsigned seg)
{
	gate->offset_low	= (u16) func;
	gate->bits.p		= 1;
	gate->bits.dpl		= dpl;
	gate->bits.zero		= 0;
	gate->bits.type		= type;
	gate->offset_middle	= (u16) (func >> 16);
#ifdef CONFIG_X86_64
	gate->segment		= __KERNEL_CS;
	gate->bits.ist		= ist;
	gate->reserved		= 0;
	gate->offset_high	= (u32) (func >> 32);
#else
	gate->segment		= seg;
	gate->bits.ist		= 0;
#endif
}

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Glauber de Oliveira Costa 85 62.96% 2 66.67%
Thomas Gleixner 50 37.04% 1 33.33%
Total 135 100.00% 3 100.00%



static inline int desc_empty(const void *ptr)
{
	const u32 *desc = ptr;

	return !(desc[0] | desc[1]);
}

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#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else

#define load_TR_desc()				native_load_tr_desc()

#define load_gdt(dtr)				native_load_gdt(dtr)

#define load_idt(dtr)				native_load_idt(dtr)

#define load_tr(tr)				asm volatile("ltr %0"::"m" (tr))

#define load_ldt(ldt)				asm volatile("lldt %0"::"m" (ldt))


#define store_gdt(dtr)				native_store_gdt(dtr)

#define store_tr(tr)				(tr = native_store_tr())


#define load_TLS(t, cpu)			native_load_tls(t, cpu)

#define set_ldt					native_set_ldt


#define write_ldt_entry(dt, entry, desc)	native_write_ldt_entry(dt, entry, desc)

#define write_gdt_entry(dt, entry, desc, type)	native_write_gdt_entry(dt, entry, desc, type)

#define write_idt_entry(dt, entry, g)		native_write_idt_entry(dt, entry, g)



static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
}

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Jeremy Fitzhardinge 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
{
}
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Total 14 100.00% 1 100.00%

#endif	/* CONFIG_PARAVIRT */


#define store_ldt(ldt) asm("sldt %0" : "=m"(ldt))



static inline void native_write_idt_entry(gate_desc *idt, int entry, const gate_desc *gate)
{
	memcpy(&idt[entry], gate, sizeof(*gate));
}

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Glauber de Oliveira Costa 36 100.00% 1 100.00%
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static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry, const void *desc)
{
	memcpy(&ldt[entry], desc, 8);
}

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static inline void

native_write_gdt_entry(struct desc_struct *gdt, int entry, const void *desc, int type)
{
	unsigned int size;

	switch (type) {
	case DESC_TSS:	size = sizeof(tss_desc);	break;
	case DESC_LDT:	size = sizeof(ldt_desc);	break;
	default:	size = sizeof(*gdt);		break;
	}

	memcpy(&gdt[entry], desc, size);
}

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Glauber de Oliveira Costa 76 97.44% 1 50.00%
Ingo Molnar 2 2.56% 1 50.00%
Total 78 100.00% 2 100.00%



static inline void set_tssldt_descriptor(void *d, unsigned long addr,
					 unsigned type, unsigned size)
{
	struct ldttss_desc *desc = d;

	memset(desc, 0, sizeof(*desc));

	desc->limit0		= (u16) size;
	desc->base0		= (u16) addr;
	desc->base1		= (addr >> 16) & 0xFF;
	desc->type		= type;
	desc->p			= 1;
	desc->limit1		= (size >> 16) & 0xF;
	desc->base2		= (addr >> 24) & 0xFF;
#ifdef CONFIG_X86_64
	desc->base3		= (u32) (addr >> 32);
#endif
}

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Glauber de Oliveira Costa 105 84.00% 3 60.00%
Thomas Gleixner 20 16.00% 2 40.00%
Total 125 100.00% 5 100.00%



static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr)
{
	struct desc_struct *d = get_cpu_gdt_rw(cpu);
	tss_desc tss;

	set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS,
			      __KERNEL_TSS_LIMIT);
	write_gdt_entry(d, entry, &tss, DESC_TSS);
}

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Glauber de Oliveira Costa 57 96.61% 2 50.00%
Andrew Lutomirski 1 1.69% 1 25.00%
Thomas Garnier 1 1.69% 1 25.00%
Total 59 100.00% 4 100.00%


#define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)



static inline void native_set_ldt(const void *addr, unsigned int entries)
{
	if (likely(entries == 0))
		asm volatile("lldt %w0"::"q" (0));
	else {
		unsigned cpu = smp_processor_id();
		ldt_desc ldt;

		set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT,
				      entries * LDT_ENTRY_SIZE - 1);
		write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_LDT,
				&ldt, DESC_LDT);
		asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
	}
}

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Glauber de Oliveira Costa 72 92.31% 2 40.00%
Joe Perches 4 5.13% 1 20.00%
Thomas Garnier 1 1.28% 1 20.00%
Michael Karcher 1 1.28% 1 20.00%
Total 78 100.00% 5 100.00%



static inline void native_load_gdt(const struct desc_ptr *dtr)
{
	asm volatile("lgdt %0"::"m" (*dtr));
}

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Thomas Garnier 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



static inline void native_load_idt(const struct desc_ptr *dtr)
{
	asm volatile("lidt %0"::"m" (*dtr));
}

Contributors
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Thomas Garnier 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



static inline void native_store_gdt(struct desc_ptr *dtr)
{
	asm volatile("sgdt %0":"=m" (*dtr));
}

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Thomas Garnier 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%



static inline void store_idt(struct desc_ptr *dtr)
{
	asm volatile("sidt %0":"=m" (*dtr));
}

Contributors
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Thomas Garnier 14 93.33% 1 50.00%
Juergen Gross 1 6.67% 1 50.00%
Total 15 100.00% 2 100.00%

/*
 * The LTR instruction marks the TSS GDT entry as busy. On 64-bit, the GDT is
 * a read-only remapping. To prevent a page fault, the GDT is switched to the
 * original writeable version when needed.
 */
#ifdef CONFIG_X86_64


static inline void native_load_tr_desc(void)
{
	struct desc_ptr gdt;
	int cpu = raw_smp_processor_id();
	bool restore = 0;
	struct desc_struct *fixmap_gdt;

	native_store_gdt(&gdt);
	fixmap_gdt = get_cpu_gdt_ro(cpu);

	/*
         * If the current GDT is the read-only fixmap, swap to the original
         * writeable version. Swap back at the end.
         */
	if (gdt.address == (unsigned long)fixmap_gdt) {
		load_direct_gdt(cpu);
		restore = 1;
	}
	asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
	if (restore)
		load_fixmap_gdt(cpu);
}
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Thomas Garnier 78 100.00% 1 100.00%
Total 78 100.00% 1 100.00%

#else


static inline void native_load_tr_desc(void)
{
	asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
}
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#endif



static inline unsigned long native_store_tr(void)
{
	unsigned long tr;

	asm volatile("str %0":"=r" (tr));

	return tr;
}

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Thomas Garnier 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%



static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
{
	struct desc_struct *gdt = get_cpu_gdt_rw(cpu);
	unsigned int i;

	for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
		gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
}

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Thomas Garnier 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%

DECLARE_PER_CPU(bool, __tss_limit_invalid);



static inline void force_reload_TR(void)
{
	struct desc_struct *d = get_current_gdt_rw();
	tss_desc tss;

	memcpy(&tss, &d[GDT_ENTRY_TSS], sizeof(tss_desc));

	/*
         * LTR requires an available TSS, and the TSS is currently
         * busy.  Make it be available so that LTR will work.
         */
	tss.type = DESC_TSS;
	write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);

	load_TR_desc();
	this_cpu_write(__tss_limit_invalid, false);
}

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Andrew Lutomirski 65 98.48% 2 66.67%
Thomas Garnier 1 1.52% 1 33.33%
Total 66 100.00% 3 100.00%

/*
 * Call this if you need the TSS limit to be correct, which should be the case
 * if and only if you have TIF_IO_BITMAP set or you're switching to a task
 * with TIF_IO_BITMAP set.
 */


static inline void refresh_tss_limit(void)
{
	DEBUG_LOCKS_WARN_ON(preemptible());

	if (unlikely(this_cpu_read(__tss_limit_invalid)))
		force_reload_TR();
}

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Andrew Lutomirski 28 100.00% 2 100.00%
Total 28 100.00% 2 100.00%

/*
 * If you do something evil that corrupts the cached TSS limit (I'm looking
 * at you, VMX exits), call this function.
 *
 * The optimization here is that the TSS limit only matters for Linux if the
 * IO bitmap is in use.  If the TSS limit gets forced to its minimum value,
 * everything works except that IO bitmap will be ignored and all CPL 3 IO
 * instructions will #GP, which is exactly what we want for normal tasks.
 */


static inline void invalidate_tss_limit(void)
{
	DEBUG_LOCKS_WARN_ON(preemptible());

	if (unlikely(test_thread_flag(TIF_IO_BITMAP)))
		force_reload_TR();
	else
		this_cpu_write(__tss_limit_invalid, true);
}

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Andrew Lutomirski 36 100.00% 2 100.00%
Total 36 100.00% 2 100.00%

/* This intentionally ignores lm, since 32-bit apps don't have that field. */

#define LDT_empty(info)					\
	((info)->base_addr              == 0    &&      \
         (info)->limit                  == 0    &&      \
         (info)->contents               == 0    &&      \
         (info)->read_exec_only         == 1    &&      \
         (info)->seg_32bit              == 0    &&      \
         (info)->limit_in_pages         == 0    &&      \
         (info)->seg_not_present        == 1    &&      \
         (info)->useable                == 0)

/* Lots of programs expect an all-zero user_desc to mean "no segment at all". */


static inline bool LDT_zero(const struct user_desc *info)
{
	return (info->base_addr		== 0 &&
		info->limit		== 0 &&
		info->contents		== 0 &&
		info->read_exec_only	== 0 &&
		info->seg_32bit		== 0 &&
		info->limit_in_pages	== 0 &&
		info->seg_not_present	== 0 &&
		info->useable		== 0);
}

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Andrew Lutomirski 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%



static inline void clear_LDT(void)
{
	set_ldt(NULL, 0);
}

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Glauber de Oliveira Costa 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



static inline unsigned long get_desc_base(const struct desc_struct *desc)
{
	return (unsigned)(desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24));
}

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Glauber de Oliveira Costa 38 86.36% 1 33.33%
Chris Lalancette 5 11.36% 1 33.33%
Roland McGrath 1 2.27% 1 33.33%
Total 44 100.00% 3 100.00%



static inline void set_desc_base(struct desc_struct *desc, unsigned long base)
{
	desc->base0 = base & 0xffff;
	desc->base1 = (base >> 16) & 0xff;
	desc->base2 = (base >> 24) & 0xff;
}

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Akinobu Mita 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



static inline unsigned long get_desc_limit(const struct desc_struct *desc)
{
	return desc->limit0 | (desc->limit1 << 16);
}

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Roland McGrath 26 96.30% 1 50.00%
Thomas Gleixner 1 3.70% 1 50.00%
Total 27 100.00% 2 100.00%



static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
{
	desc->limit0 = limit & 0xffff;
	desc->limit1 = (limit >> 16) & 0xf;
}

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Akinobu Mita 35 97.22% 1 50.00%
Thomas Gleixner 1 2.78% 1 50.00%
Total 36 100.00% 2 100.00%

void update_intr_gate(unsigned int n, const void *addr);
void alloc_intr_gate(unsigned int n, const void *addr);

extern unsigned long used_vectors[];

#ifdef CONFIG_X86_64
DECLARE_PER_CPU(u32, debug_idt_ctr);


static inline bool is_debug_idt_enabled(void)
{
	if (this_cpu_read(debug_idt_ctr))
		return true;

	return false;
}

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Seiji Aguchi 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



static inline void load_debug_idt(void)
{
	load_idt((const struct desc_ptr *)&debug_idt_descr);
}
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Seiji Aguchi 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%

#else


static inline bool is_debug_idt_enabled(void)
{
	return false;
}

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Total 12 100.00% 1 100.00%



static inline void load_debug_idt(void)
{
}
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Seiji Aguchi 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%

#endif

/*
 * The load_current_idt() must be called with interrupts disabled
 * to avoid races. That way the IDT will always be set back to the expected
 * descriptor. It's also called when a CPU is being initialized, and
 * that doesn't need to disable interrupts, as nothing should be
 * bothering the CPU then.
 */


static inline void load_current_idt(void)
{
	if (is_debug_idt_enabled())
		load_debug_idt();
	else
		load_idt((const struct desc_ptr *)&idt_descr);
}

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Seiji Aguchi 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%

extern void idt_setup_early_handler(void);
extern void idt_setup_early_traps(void);
extern void idt_setup_traps(void);
extern void idt_setup_apic_and_irq_gates(void);

#ifdef CONFIG_X86_64
extern void idt_setup_early_pf(void);
extern void idt_setup_ist_traps(void);
extern void idt_setup_debugidt_traps(void);
#else


static inline void idt_setup_early_pf(void) { }
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Thomas Gleixner 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void idt_setup_ist_traps(void) { }
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Thomas Gleixner 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void idt_setup_debugidt_traps(void) { }
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Thomas Gleixner 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%

#endif

extern void idt_invalidate(void *addr);

#endif /* _ASM_X86_DESC_H */
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Glauber de Oliveira Costa 911 46.67% 9 16.98%
Thomas Garnier 322 16.50% 2 3.77%
Andrew Lutomirski 229 11.73% 7 13.21%
Thomas Gleixner 174 8.91% 13 24.53%
Seiji Aguchi 122 6.25% 3 5.66%
Akinobu Mita 83 4.25% 1 1.89%
Jeremy Fitzhardinge 35 1.79% 2 3.77%
Roland McGrath 28 1.43% 1 1.89%
Steven Rostedt 9 0.46% 2 3.77%
Jaswinder Singh Rajput 7 0.36% 1 1.89%
Joe Perches 6 0.31% 1 1.89%
Chris Lalancette 5 0.26% 1 1.89%
Ingo Molnar 4 0.20% 1 1.89%
Alan Mayer 3 0.15% 1 1.89%
Alex Shi 3 0.15% 1 1.89%
Yinghai Lu 3 0.15% 1 1.89%
H. Peter Anvin 3 0.15% 1 1.89%
Greg Kroah-Hartman 1 0.05% 1 1.89%
David Howells 1 0.05% 1 1.89%
Kees Cook 1 0.05% 1 1.89%
Juergen Gross 1 0.05% 1 1.89%
Michael Karcher 1 0.05% 1 1.89%
Total 1952 100.00% 53 100.00%
Directory: arch/x86/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Glauber de Oliveira Costa	148	93.08%	1	16.67%
Jeremy Fitzhardinge	6	3.77%	1	16.67%
Ingo Molnar	2	1.26%	1	16.67%
Thomas Gleixner	1	0.63%	1	16.67%
Roland McGrath	1	0.63%	1	16.67%
Andrew Lutomirski	1	0.63%	1	16.67%
Total	159	100.00%	6	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 arch/x86/include/asm/desc.h

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