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x86/idt: Make IDT init functions static inlines

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Move these two functions from kernel/idt.c to include/asm/desc.h:

	* init_idt_data()
	* idt_init_desc()

These functions are needed to setup IDT entries very early and need to
be called from head64.c. To be usable this early, these functions need
to be compiled without instrumentation and the stack-protector feature.

These features need to be kept enabled for kernel/idt.c, so head64.c
must use its own versions.

 [ bp: Take Kees' suggested patch title and add his Rev-by. ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200907131613.12703-35-joro@8bytes.org
This commit is contained in:
Joerg Roedel 2020-09-07 15:15:35 +02:00 committed by Borislav Petkov
parent f5963ba7a4
commit 097ee5b778
3 changed files with 34 additions and 34 deletions
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27
arch/x86/include/asm/desc.h
View file

@ -383,6 +383,33 @@ static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
void alloc_intr_gate(unsigned int n, const void *addr);
static inline void init_idt_data(struct idt_data *data, unsigned int n,
const void *addr)
{
BUG_ON(n > 0xFF);
memset(data, 0, sizeof(*data));
data->vector = n;
data->addr = addr;
data->segment = __KERNEL_CS;
data->bits.type = GATE_INTERRUPT;
data->bits.p = 1;
}
static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d)
{
unsigned long addr = (unsigned long) d->addr;
gate->offset_low = (u16) addr;
gate->segment = (u16) d->segment;
gate->bits = d->bits;
gate->offset_middle = (u16) (addr >> 16);
#ifdef CONFIG_X86_64
gate->offset_high = (u32) (addr >> 32);
gate->reserved = 0;
#endif
}
extern unsigned long system_vectors[];
extern void load_current_idt(void);

7
arch/x86/include/asm/desc_defs.h
View file

@ -74,6 +74,13 @@ struct idt_bits {
p : 1;
} __attribute__((packed));
struct idt_data {
unsigned int vector;
unsigned int segment;
struct idt_bits bits;
const void *addr;
};
struct gate_struct {
u16 offset_low;
u16 segment;

34
arch/x86/kernel/idt.c
View file

@ -11,13 +11,6 @@
#include <asm/desc.h>
#include <asm/hw_irq.h>
struct idt_data {
unsigned int vector;
unsigned int segment;
struct idt_bits bits;
const void *addr;
};
#define DPL0 0x0
#define DPL3 0x3
@ -178,20 +171,6 @@ bool idt_is_f00f_address(unsigned long address)
}
#endif
static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d)
{
unsigned long addr = (unsigned long) d->addr;
gate->offset_low = (u16) addr;
gate->segment = (u16) d->segment;
gate->bits = d->bits;
gate->offset_middle = (u16) (addr >> 16);
#ifdef CONFIG_X86_64
gate->offset_high = (u32) (addr >> 32);
gate->reserved = 0;
#endif
}
static __init void
idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sys)
{
@ -205,19 +184,6 @@ idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sy
}
}
static void init_idt_data(struct idt_data *data, unsigned int n,
const void *addr)
{
BUG_ON(n > 0xFF);
memset(data, 0, sizeof(*data));
data->vector = n;
data->addr = addr;
data->segment = __KERNEL_CS;
data->bits.type = GATE_INTERRUPT;
data->bits.p = 1;
}
static __init void set_intr_gate(unsigned int n, const void *addr)
{
struct idt_data data;