forked from KolibriOS/kolibrios
266 lines
7.5 KiB
C
266 lines
7.5 KiB
C
|
#ifndef _ASM_X86_SEGMENT_H
|
||
|
|
#define _ASM_X86_SEGMENT_H
|
||
|
|
|
||
|
|
#include <linux/const.h>
|
||
|
|
|
||
|
|
/* Constructor for a conventional segment GDT (or LDT) entry */
|
||
|
|
/* This is a macro so it can be used in initializers */
|
||
|
|
#define GDT_ENTRY(flags, base, limit) \
|
||
|
|
((((base) & _AC(0xff000000,ULL)) << (56-24)) | \
|
||
|
|
(((flags) & _AC(0x0000f0ff,ULL)) << 40) | \
|
||
|
|
(((limit) & _AC(0x000f0000,ULL)) << (48-16)) | \
|
||
|
|
(((base) & _AC(0x00ffffff,ULL)) << 16) | \
|
||
|
|
(((limit) & _AC(0x0000ffff,ULL))))
|
||
|
|
|
||
|
|
/* Simple and small GDT entries for booting only */
|
||
|
|
|
||
|
|
#define GDT_ENTRY_BOOT_CS 2
|
||
|
|
#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1)
|
||
|
|
#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_BOOT_TSS (GDT_ENTRY_BOOT_CS + 2)
|
||
|
|
#define __BOOT_TSS (GDT_ENTRY_BOOT_TSS * 8)
|
||
|
|
|
||
|
|
#define SEGMENT_RPL_MASK 0x3 /*
|
||
|
|
* Bottom two bits of selector give the ring
|
||
|
|
* privilege level
|
||
|
|
*/
|
||
|
|
#define SEGMENT_TI_MASK 0x4 /* Bit 2 is table indicator (LDT/GDT) */
|
||
|
|
#define USER_RPL 0x3 /* User mode is privilege level 3 */
|
||
|
|
#define SEGMENT_LDT 0x4 /* LDT segment has TI set... */
|
||
|
|
#define SEGMENT_GDT 0x0 /* ... GDT has it cleared */
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_32
|
||
|
|
/*
|
||
|
|
* The layout of the per-CPU GDT under Linux:
|
||
|
|
*
|
||
|
|
* 0 - null
|
||
|
|
* 1 - reserved
|
||
|
|
* 2 - reserved
|
||
|
|
* 3 - reserved
|
||
|
|
*
|
||
|
|
* 4 - unused <==== new cacheline
|
||
|
|
* 5 - unused
|
||
|
|
*
|
||
|
|
* ------- start of TLS (Thread-Local Storage) segments:
|
||
|
|
*
|
||
|
|
* 6 - TLS segment #1 [ glibc's TLS segment ]
|
||
|
|
* 7 - TLS segment #2 [ Wine's %fs Win32 segment ]
|
||
|
|
* 8 - TLS segment #3
|
||
|
|
* 9 - reserved
|
||
|
|
* 10 - reserved
|
||
|
|
* 11 - reserved
|
||
|
|
*
|
||
|
|
* ------- start of kernel segments:
|
||
|
|
*
|
||
|
|
* 12 - kernel code segment <==== new cacheline
|
||
|
|
* 13 - kernel data segment
|
||
|
|
* 14 - default user CS
|
||
|
|
* 15 - default user DS
|
||
|
|
* 16 - TSS
|
||
|
|
* 17 - LDT
|
||
|
|
* 18 - PNPBIOS support (16->32 gate)
|
||
|
|
* 19 - PNPBIOS support
|
||
|
|
* 20 - PNPBIOS support
|
||
|
|
* 21 - PNPBIOS support
|
||
|
|
* 22 - PNPBIOS support
|
||
|
|
* 23 - APM BIOS support
|
||
|
|
* 24 - APM BIOS support
|
||
|
|
* 25 - APM BIOS support
|
||
|
|
*
|
||
|
|
* 26 - ESPFIX small SS
|
||
|
|
* 27 - per-cpu [ offset to per-cpu data area ]
|
||
|
|
* 28 - stack_canary-20 [ for stack protector ]
|
||
|
|
* 29 - unused
|
||
|
|
* 30 - unused
|
||
|
|
* 31 - TSS for double fault handler
|
||
|
|
*/
|
||
|
|
#define GDT_ENTRY_TLS_MIN 6
|
||
|
|
#define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_DEFAULT_USER_CS 14
|
||
|
|
|
||
|
|
#define GDT_ENTRY_DEFAULT_USER_DS 15
|
||
|
|
|
||
|
|
#define GDT_ENTRY_KERNEL_BASE (12)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE+0)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE+1)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE+4)
|
||
|
|
#define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE+5)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE+6)
|
||
|
|
#define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE+11)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE+14)
|
||
|
|
#define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS*8)
|
||
|
|
|
||
|
|
#define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE+15)
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
#define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8)
|
||
|
|
#else
|
||
|
|
#define __KERNEL_PERCPU 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define GDT_ENTRY_STACK_CANARY (GDT_ENTRY_KERNEL_BASE+16)
|
||
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
||
|
|
#define __KERNEL_STACK_CANARY (GDT_ENTRY_STACK_CANARY*8)
|
||
|
|
#else
|
||
|
|
#define __KERNEL_STACK_CANARY 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define GDT_ENTRY_DOUBLEFAULT_TSS 31
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The GDT has 32 entries
|
||
|
|
*/
|
||
|
|
#define GDT_ENTRIES 32
|
||
|
|
|
||
|
|
/* The PnP BIOS entries in the GDT */
|
||
|
|
#define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0)
|
||
|
|
#define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1)
|
||
|
|
#define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2)
|
||
|
|
#define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3)
|
||
|
|
#define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4)
|
||
|
|
|
||
|
|
/* The PnP BIOS selectors */
|
||
|
|
#define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */
|
||
|
|
#define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */
|
||
|
|
#define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */
|
||
|
|
#define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */
|
||
|
|
#define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Matching rules for certain types of segments.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
|
||
|
|
#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)
|
||
|
|
|
||
|
|
|
||
|
|
#else
|
||
|
|
#include <asm/cache.h>
|
||
|
|
|
||
|
|
#define GDT_ENTRY_KERNEL32_CS 1
|
||
|
|
#define GDT_ENTRY_KERNEL_CS 2
|
||
|
|
#define GDT_ENTRY_KERNEL_DS 3
|
||
|
|
|
||
|
|
#define __KERNEL32_CS (GDT_ENTRY_KERNEL32_CS * 8)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* we cannot use the same code segment descriptor for user and kernel
|
||
|
|
* -- not even in the long flat mode, because of different DPL /kkeil
|
||
|
|
* The segment offset needs to contain a RPL. Grr. -AK
|
||
|
|
* GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
|
||
|
|
*/
|
||
|
|
#define GDT_ENTRY_DEFAULT_USER32_CS 4
|
||
|
|
#define GDT_ENTRY_DEFAULT_USER_DS 5
|
||
|
|
#define GDT_ENTRY_DEFAULT_USER_CS 6
|
||
|
|
#define __USER32_CS (GDT_ENTRY_DEFAULT_USER32_CS*8+3)
|
||
|
|
#define __USER32_DS __USER_DS
|
||
|
|
|
||
|
|
#define GDT_ENTRY_TSS 8 /* needs two entries */
|
||
|
|
#define GDT_ENTRY_LDT 10 /* needs two entries */
|
||
|
|
#define GDT_ENTRY_TLS_MIN 12
|
||
|
|
#define GDT_ENTRY_TLS_MAX 14
|
||
|
|
|
||
|
|
#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */
|
||
|
|
#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3)
|
||
|
|
|
||
|
|
/* TLS indexes for 64bit - hardcoded in arch_prctl */
|
||
|
|
#define FS_TLS 0
|
||
|
|
#define GS_TLS 1
|
||
|
|
|
||
|
|
#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
|
||
|
|
#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
|
||
|
|
|
||
|
|
#define GDT_ENTRIES 16
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS*8)
|
||
|
|
#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS*8)
|
||
|
|
#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS*8+3)
|
||
|
|
#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS*8+3)
|
||
|
|
#ifndef CONFIG_PARAVIRT
|
||
|
|
#define get_kernel_rpl() 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define IDT_ENTRIES 256
|
||
|
|
#define NUM_EXCEPTION_VECTORS 32
|
||
|
|
/* Bitmask of exception vectors which push an error code on the stack */
|
||
|
|
#define EXCEPTION_ERRCODE_MASK 0x00027d00
|
||
|
|
#define GDT_SIZE (GDT_ENTRIES * 8)
|
||
|
|
#define GDT_ENTRY_TLS_ENTRIES 3
|
||
|
|
#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
|
||
|
|
|
||
|
|
#ifdef __KERNEL__
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][2+2+5];
|
||
|
|
#ifdef CONFIG_TRACING
|
||
|
|
#define trace_early_idt_handlers early_idt_handlers
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Load a segment. Fall back on loading the zero
|
||
|
|
* segment if something goes wrong..
|
||
|
|
*/
|
||
|
|
#define loadsegment(seg, value) \
|
||
|
|
do { \
|
||
|
|
unsigned short __val = (value); \
|
||
|
|
\
|
||
|
|
asm volatile(" \n" \
|
||
|
|
"1: movl %k0,%%" #seg " \n" \
|
||
|
|
\
|
||
|
|
".section .fixup,\"ax\" \n" \
|
||
|
|
"2: xorl %k0,%k0 \n" \
|
||
|
|
" jmp 1b \n" \
|
||
|
|
".previous \n" \
|
||
|
|
\
|
||
|
|
_ASM_EXTABLE(1b, 2b) \
|
||
|
|
\
|
||
|
|
: "+r" (__val) : : "memory"); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Save a segment register away
|
||
|
|
*/
|
||
|
|
#define savesegment(seg, value) \
|
||
|
|
asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
|
||
|
|
|
||
|
|
/*
|
||
|
|
* x86_32 user gs accessors.
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_X86_32
|
||
|
|
#ifdef CONFIG_X86_32_LAZY_GS
|
||
|
|
#define get_user_gs(regs) (u16)({unsigned long v; savesegment(gs, v); v;})
|
||
|
|
#define set_user_gs(regs, v) loadsegment(gs, (unsigned long)(v))
|
||
|
|
#define task_user_gs(tsk) ((tsk)->thread.gs)
|
||
|
|
#define lazy_save_gs(v) savesegment(gs, (v))
|
||
|
|
#define lazy_load_gs(v) loadsegment(gs, (v))
|
||
|
|
#else /* X86_32_LAZY_GS */
|
||
|
|
#define get_user_gs(regs) (u16)((regs)->gs)
|
||
|
|
#define set_user_gs(regs, v) do { (regs)->gs = (v); } while (0)
|
||
|
|
#define task_user_gs(tsk) (task_pt_regs(tsk)->gs)
|
||
|
|
#define lazy_save_gs(v) do { } while (0)
|
||
|
|
#define lazy_load_gs(v) do { } while (0)
|
||
|
|
#endif /* X86_32_LAZY_GS */
|
||
|
|
#endif /* X86_32 */
|
||
|
|
|
||
|
|
static inline unsigned long get_limit(unsigned long segment)
|
||
|
|
{
|
||
|
|
unsigned long __limit;
|
||
|
|
asm("lsll %1,%0" : "=r" (__limit) : "r" (segment));
|
||
|
|
return __limit + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
#endif /* __KERNEL__ */
|
||
|
|
|
||
|
|
#endif /* _ASM_X86_SEGMENT_H */
|