Source to include/mach/machreg.h

0001  #ifndef _MACHREG_H
0002  #define _MACHREG_H
0003  /*
0004   * machreg.h
0005   *	Register definitions for i386
0006   */
0007  #include <sys/types.h>
0008  #include <sys/param.h>
0009  
0010  /*
0011   * This is what is added to a user's stack when an event is
0012   * delivered.
0013   */
0014  struct evframe {
0015  	char ev_event[EVLEN];		/* Event delivered */
0016  	ulong ev_previp;		/* Previous IP */
0017  };
0018  
0019  /*
0020   * This is the shape of the kernel stack after taking an interrupt
0021   * or exception.  For machine traps which don't provide an error
0022   * code, we push a 0 ourselves.  "traptype" is from sys/trap.h.
0023   * edi..eax are in pushal format.
0024   */
0025  struct trapframe {
0026  	ulong esds;
0027  	ulong edi, esi, ebp, espdummy, ebx, edx, ecx, eax;
0028  	ulong traptype;
0029  	ulong errcode;
0030  	ulong eip, ecs;
0031  	ulong eflags;
0032  	ulong esp, ess;
0033  };
0034  #define NREG (sizeof(struct trapframe) / sizeof(ulong))
0035  
0036  /*
0037   * When the registers are pushed with the "pusha" instruction, this
0038   * is the resulting format.
0039   */
0040  struct pushaframe {
0041  	ulong edi, esi, ebp, esp, ebx, edx, ecx, eax;
0042  };
0043  
0044  /*
0045   * Tell if given descriptor is from user mode
0046   */
0047  #define USERMODE(tf) ((tf)->ecs & 0x3)
0048  
0049  /*
0050   * Bits in eflags
0051   */
0052  #define	F_CF	0x00000001	/* carry */
0053  #define	F_PF	0x00000004	/* parity */
0054  #define	F_AF	0x00000010	/* BCD stuff */
0055  #define	F_ZF	0x00000040	/* zero */
0056  #define	F_SF	0x00000080	/* sign */
0057  #define	F_TF	0x00000100	/* single step */
0058  #define	F_IF	0x00000200	/* interrupts */
0059  #define	F_DF	0x00000400	/* direction */
0060  #define	F_OF	0x00000800	/* overflow */
0061  #define	F_IOPL	0x00003000	/* IO privilege level */
0062  #define	F_NT	0x00004000	/* nested task */
0063  #define	F_RF	0x00010000	/* resume flag */
0064  #define	F_VM	0x00020000	/* virtual 8086 */
0065  
0066  /*
0067   * Bits in errcode when handling page fault
0068   */
0069  #define EC_KERNEL 4	/* Fault from kernel mode */
0070  #define EC_WRITE 2	/* Access was a write */
0071  #define EC_PROT 1	/* Page valid, but access modes wrong */
0072  
0073  #ifdef PROC_DEBUG
0074  /*
0075   * This stuff is only needed in the context of proc.h, and only
0076   * then when process debugging is configured.
0077   *
0078   * WARNING: locore.s knows about this struct, so don't fiddle it
0079   * until you've looked at how locore.s uses it.
0080   */
0081  struct dbg_regs {
0082  	ulong dr[4];	/* DR0..3--linear addr to break on */
0083  	ulong dr7;	/* Debug control register */
0084  };
0085  #endif /* PROC_DEBUG */
0086  
0087  /*
0088   * Buffer for saving FPU state - matches the layout used by frestor
0089   */
0090  struct fpu {
0091  	ulong ocw, osw, otw, oip, ocs, ooo, oos, ost[20];
0092  };
0093  
0094  /*
0095   * Bits in CR0
0096   */
0097  #define BIT(x) (1 << (x))
0098  #define CR0_PE BIT(0)	/* Protection enable */
0099  #define CR0_MP BIT(1)	/* Math processor present */
0100  #define CR0_EM BIT(2)	/* Emulate FP--trap on FP instruction */
0101  #define CR0_TS BIT(3)	/* Task switched flag */
0102  #define CR0_ET BIT(4)	/* Extension type--387 DX presence */
0103  #define CR0_NE BIT(5)	/* Numeric Error--allow traps on numeric errors */
0104  #define CR0_WP BIT(16)	/* Write protect--ring 0 honors RO PTE's */
0105  #define CR0_AM BIT(18)	/* Alignment--trap on unaligned refs */
0106  #define CR0_NW BIT(29)	/* Not write-through--inhibit write-through */
0107  #define CR0_CD BIT(30)	/* Cache disable */
0108  #define CR0_PG BIT(31)	/* Paging--use PTEs/CR3 */
0109  
0110  #ifdef KERNEL
0111  extern void fpu_enable(struct fpu *), fpu_disable(struct fpu *),
0112  	fpu_maskexcep(void);
0113  extern int fpu_detected(void);
0114  #endif /* KERNEL */
0115  
0116  #endif /* _MACHREG_H */