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097ee5b778
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
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Written 2000 by Andi Kleen */
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#ifndef _ASM_X86_DESC_DEFS_H
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#define _ASM_X86_DESC_DEFS_H
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/*
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* Segment descriptor structure definitions, usable from both x86_64 and i386
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* archs.
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*/
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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/* 8 byte segment descriptor */
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struct desc_struct {
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u16 limit0;
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u16 base0;
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u16 base1: 8, type: 4, s: 1, dpl: 2, p: 1;
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u16 limit1: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
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} __attribute__((packed));
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#define GDT_ENTRY_INIT(flags, base, limit) \
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{ \
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.limit0 = (u16) (limit), \
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.limit1 = ((limit) >> 16) & 0x0F, \
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.base0 = (u16) (base), \
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.base1 = ((base) >> 16) & 0xFF, \
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.base2 = ((base) >> 24) & 0xFF, \
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.type = (flags & 0x0f), \
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.s = (flags >> 4) & 0x01, \
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.dpl = (flags >> 5) & 0x03, \
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.p = (flags >> 7) & 0x01, \
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.avl = (flags >> 12) & 0x01, \
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.l = (flags >> 13) & 0x01, \
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.d = (flags >> 14) & 0x01, \
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.g = (flags >> 15) & 0x01, \
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}
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enum {
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GATE_INTERRUPT = 0xE,
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GATE_TRAP = 0xF,
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GATE_CALL = 0xC,
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GATE_TASK = 0x5,
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};
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enum {
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DESC_TSS = 0x9,
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DESC_LDT = 0x2,
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DESCTYPE_S = 0x10, /* !system */
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};
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/* LDT or TSS descriptor in the GDT. */
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struct ldttss_desc {
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u16 limit0;
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u16 base0;
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u16 base1 : 8, type : 5, dpl : 2, p : 1;
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u16 limit1 : 4, zero0 : 3, g : 1, base2 : 8;
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#ifdef CONFIG_X86_64
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u32 base3;
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u32 zero1;
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#endif
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} __attribute__((packed));
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typedef struct ldttss_desc ldt_desc;
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typedef struct ldttss_desc tss_desc;
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struct idt_bits {
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u16 ist : 3,
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zero : 5,
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type : 5,
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dpl : 2,
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p : 1;
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} __attribute__((packed));
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struct idt_data {
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unsigned int vector;
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unsigned int segment;
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struct idt_bits bits;
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const void *addr;
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};
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struct gate_struct {
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u16 offset_low;
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u16 segment;
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struct idt_bits bits;
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u16 offset_middle;
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#ifdef CONFIG_X86_64
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u32 offset_high;
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u32 reserved;
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#endif
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} __attribute__((packed));
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typedef struct gate_struct gate_desc;
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static inline unsigned long gate_offset(const gate_desc *g)
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{
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#ifdef CONFIG_X86_64
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return g->offset_low | ((unsigned long)g->offset_middle << 16) |
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((unsigned long) g->offset_high << 32);
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#else
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return g->offset_low | ((unsigned long)g->offset_middle << 16);
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#endif
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}
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static inline unsigned long gate_segment(const gate_desc *g)
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{
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return g->segment;
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}
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struct desc_ptr {
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unsigned short size;
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unsigned long address;
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} __attribute__((packed)) ;
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#endif /* !__ASSEMBLY__ */
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/* Boot IDT definitions */
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#define BOOT_IDT_ENTRIES 32
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/* Access rights as returned by LAR */
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#define AR_TYPE_RODATA (0 * (1 << 9))
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#define AR_TYPE_RWDATA (1 * (1 << 9))
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#define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9))
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#define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9))
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#define AR_TYPE_XOCODE (4 * (1 << 9))
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#define AR_TYPE_XRCODE (5 * (1 << 9))
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#define AR_TYPE_XOCODE_CONF (6 * (1 << 9))
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#define AR_TYPE_XRCODE_CONF (7 * (1 << 9))
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#define AR_TYPE_MASK (7 * (1 << 9))
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#define AR_DPL0 (0 * (1 << 13))
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#define AR_DPL3 (3 * (1 << 13))
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#define AR_DPL_MASK (3 * (1 << 13))
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#define AR_A (1 << 8) /* "Accessed" */
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#define AR_S (1 << 12) /* If clear, "System" segment */
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#define AR_P (1 << 15) /* "Present" */
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#define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */
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#define AR_L (1 << 21) /* "Long mode" for code segments */
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#define AR_DB (1 << 22) /* D/B, effect depends on type */
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#define AR_G (1 << 23) /* "Granularity" (limit in pages) */
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#endif /* _ASM_X86_DESC_DEFS_H */
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