mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
014eea518a
Make the GDT_ENTRY() macro in <asm/segment.h> safe for use in assembly code by guarding the ULL suffixes with _AC() macros. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> LKML-Reference: <4D5DFBE4.7090104@intel.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Matthieu Castet <castet.matthieu@free.fr> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
219 lines
6.1 KiB
C
219 lines
6.1 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)
|
|
|
|
#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 */
|
|
|
|
/* Bottom two bits of selector give the ring privilege level */
|
|
#define SEGMENT_RPL_MASK 0x3
|
|
/* Bit 2 is table indicator (LDT/GDT) */
|
|
#define SEGMENT_TI_MASK 0x4
|
|
|
|
/* User mode is privilege level 3 */
|
|
#define USER_RPL 0x3
|
|
/* LDT segment has TI set, GDT has it cleared */
|
|
#define SEGMENT_LDT 0x4
|
|
#define SEGMENT_GDT 0x0
|
|
|
|
/*
|
|
* 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
|
|
|
|
/* User mode is privilege level 3 */
|
|
#define USER_RPL 0x3
|
|
/* LDT segment has TI set, GDT has it cleared */
|
|
#define SEGMENT_LDT 0x4
|
|
#define SEGMENT_GDT 0x0
|
|
|
|
/* Bottom two bits of selector give the ring privilege level */
|
|
#define SEGMENT_RPL_MASK 0x3
|
|
/* Bit 2 is table indicator (LDT/GDT) */
|
|
#define SEGMENT_TI_MASK 0x4
|
|
|
|
#define IDT_ENTRIES 256
|
|
#define NUM_EXCEPTION_VECTORS 32
|
|
#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][10];
|
|
#endif
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_SEGMENT_H */
|