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3b184b71df
We have no known use for having the CPU track whether GDT descriptors have been accessed or not. Simplify the code by adding the flag to the common flags and removing it everywhere else. Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20231219151200.2878271-5-vegard.nossum@oracle.com
198 lines
4.8 KiB
C
198 lines
4.8 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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/*
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* Low-level interface mapping flags/field names to bits
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*/
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/* Flags for _DESC_S (non-system) descriptors */
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#define _DESC_ACCESSED 0x0001
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#define _DESC_DATA_WRITABLE 0x0002
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#define _DESC_CODE_READABLE 0x0002
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#define _DESC_DATA_EXPAND_DOWN 0x0004
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#define _DESC_CODE_CONFORMING 0x0004
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#define _DESC_CODE_EXECUTABLE 0x0008
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/* Common flags */
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#define _DESC_S 0x0010
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#define _DESC_DPL(dpl) ((dpl) << 5)
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#define _DESC_PRESENT 0x0080
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#define _DESC_LONG_CODE 0x2000
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#define _DESC_DB 0x4000
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#define _DESC_GRANULARITY_4K 0x8000
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/* System descriptors have a numeric "type" field instead of flags */
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#define _DESC_SYSTEM(code) (code)
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/*
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* High-level interface mapping intended usage to low-level combinations
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* of flags
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*/
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#define _DESC_DATA (_DESC_S | _DESC_PRESENT | _DESC_ACCESSED | \
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_DESC_DATA_WRITABLE)
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#define _DESC_CODE (_DESC_S | _DESC_PRESENT | _DESC_ACCESSED | \
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_DESC_CODE_READABLE | _DESC_CODE_EXECUTABLE)
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#define DESC_DATA16 (_DESC_DATA)
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#define DESC_CODE16 (_DESC_CODE)
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#define DESC_DATA32 (_DESC_DATA | _DESC_GRANULARITY_4K | _DESC_DB)
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#define DESC_DATA32_BIOS (_DESC_DATA | _DESC_DB)
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#define DESC_CODE32 (_DESC_CODE | _DESC_GRANULARITY_4K | _DESC_DB)
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#define DESC_CODE32_BIOS (_DESC_CODE | _DESC_DB)
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#define DESC_TSS32 (_DESC_SYSTEM(9) | _DESC_PRESENT)
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#define DESC_DATA64 (_DESC_DATA | _DESC_GRANULARITY_4K | _DESC_DB)
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#define DESC_CODE64 (_DESC_CODE | _DESC_GRANULARITY_4K | _DESC_LONG_CODE)
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#define DESC_USER (_DESC_DPL(3))
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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 = ((limit) >> 0) & 0xFFFF, \
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.limit1 = ((limit) >> 16) & 0x000F, \
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.base0 = ((base) >> 0) & 0xFFFF, \
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.base1 = ((base) >> 16) & 0x00FF, \
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.base2 = ((base) >> 24) & 0x00FF, \
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.type = ((flags) >> 0) & 0x000F, \
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.s = ((flags) >> 4) & 0x0001, \
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.dpl = ((flags) >> 5) & 0x0003, \
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.p = ((flags) >> 7) & 0x0001, \
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.avl = ((flags) >> 12) & 0x0001, \
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.l = ((flags) >> 13) & 0x0001, \
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.d = ((flags) >> 14) & 0x0001, \
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.g = ((flags) >> 15) & 0x0001, \
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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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#ifndef _SETUP
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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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#endif
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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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