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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: machine/thread.h
*
* This file contains the structure definitions for the thread
* state as applied to I386 processors.
*/
#ifndef _I386_THREAD_H_
#define _I386_THREAD_H_
#include <mach/boolean.h>
#include <mach/machine/vm_types.h>
#include <mach/machine/fp_reg.h>
#include <kern/lock.h>
#include <i386/tss.h>
#include "gdt.h"
/*
* i386_saved_state:
*
* This structure corresponds to the state of user registers
* as saved upon kernel entry. It lives in the pcb.
* It is also pushed onto the stack for exceptions in the kernel.
*/
struct i386_saved_state {
unsigned int gs;
unsigned int fs;
unsigned int es;
unsigned int ds;
unsigned int edi;
unsigned int esi;
unsigned int ebp;
unsigned int cr2; /* kernel esp stored by pusha -
we save cr2 here later */
unsigned int ebx;
unsigned int edx;
unsigned int ecx;
unsigned int eax;
unsigned int trapno;
unsigned int err;
unsigned int eip;
unsigned int cs;
unsigned int efl;
unsigned int uesp;
unsigned int ss;
struct v86_segs {
unsigned int v86_es; /* virtual 8086 segment registers */
unsigned int v86_ds;
unsigned int v86_fs;
unsigned int v86_gs;
} v86_segs;
};
/*
* i386_exception_link:
*
* This structure lives at the high end of the kernel stack.
* It points to the current thread`s user registers.
*/
struct i386_exception_link {
struct i386_saved_state *saved_state;
};
/*
* i386_kernel_state:
*
* This structure corresponds to the state of kernel registers
* as saved in a context-switch. It lives at the base of the stack.
*/
struct i386_kernel_state {
int k_ebx; /* kernel context */
int k_esp;
int k_ebp;
int k_edi;
int k_esi;
int k_eip;
};
/*
* Save area for user floating-point state.
* Allocated only when necessary.
*/
struct i386_fpsave_state {
union {
struct {
struct i386_fp_save fp_save_state;
struct i386_fp_regs fp_regs;
};
struct i386_xfp_save xfp_save_state;
};
boolean_t fp_valid;
};
/*
* v86_assist_state:
*
* This structure provides data to simulate 8086 mode
* interrupts. It lives in the pcb.
*/
struct v86_assist_state {
vm_offset_t int_table;
unsigned short int_count;
unsigned short flags; /* 8086 flag bits */
};
#define V86_IF_PENDING 0x8000 /* unused bit */
/*
* i386_interrupt_state:
*
* This structure describes the set of registers that must
* be pushed on the current ring-0 stack by an interrupt before
* we can switch to the interrupt stack.
*/
struct i386_interrupt_state {
int gs;
int fs;
int es;
int ds;
int edx;
int ecx;
int eax;
int eip;
int cs;
int efl;
};
/*
* i386_machine_state:
*
* This structure corresponds to special machine state.
* It lives in the pcb. It is not saved by default.
*/
struct i386_machine_state {
struct user_ldt * ldt;
struct i386_fpsave_state *ifps;
struct v86_assist_state v86s;
struct real_descriptor user_gdt[USER_GDT_SLOTS];
};
typedef struct pcb {
struct i386_interrupt_state iis[2]; /* interrupt and NMI */
struct i386_saved_state iss;
struct i386_machine_state ims;
decl_simple_lock_data(, lock)
#ifdef LINUX_DEV
void *data;
#endif
} *pcb_t;
/*
* On the kernel stack is:
* stack: ...
* struct i386_exception_link
* struct i386_kernel_state
* stack+KERNEL_STACK_SIZE
*/
#define STACK_IKS(stack) \
((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1)
#define STACK_IEL(stack) \
((struct i386_exception_link *)STACK_IKS(stack) - 1)
#define USER_REGS(thread) (&(thread)->pcb->iss)
#define syscall_emulation_sync(task) /* do nothing */
/* #include_next "thread.h" */
#endif /* _I386_THREAD_H_ */
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