1 /* $OpenBSD: pcb.h,v 1.9 2024/10/22 21:50:02 jsg Exp $ */ 2 /* 3 * Copyright (c) 1996 Nivas Madhur 4 * Mach Operating System 5 * Copyright (c) 1993-1992 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON AND OMRON ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON AND OMRON DISCLAIM ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 /* 29 * Motorola 88100 pcb definitions 30 * 31 */ 32 /* 33 */ 34 #ifndef _M88K_PCB_H_ 35 #define _M88K_PCB_H_ 36 37 #include <machine/frame.h> 38 39 /* 40 * Our PCB is the regular PCB+Save area for kernel frame. 41 * Upon entering kernel mode from userland, save the user context 42 * in the saved_state area - this is passed as the exception frame. 43 * On a context switch, only registers that need to be saved by the 44 * C calling convention and few other regs (pc, psr etc) are saved 45 * in the kernel_state part of the PCB. Typically, trap frames are 46 * saved on the stack (by low level handlers or by hardware) but, 47 * we just decided to do it in the PCB. 48 */ 49 50 struct m88100_pcb { 51 unsigned long pcb_pc; /* address to return */ 52 unsigned long :32; 53 unsigned long pcb_r14; 54 unsigned long pcb_r15; 55 unsigned long pcb_r16; 56 unsigned long pcb_r17; 57 unsigned long pcb_r18; 58 unsigned long pcb_r19; 59 unsigned long pcb_r20; 60 unsigned long pcb_r21; 61 unsigned long pcb_r22; 62 unsigned long pcb_r23; 63 unsigned long pcb_r24; 64 unsigned long pcb_r25; 65 unsigned long pcb_r26; 66 unsigned long pcb_r27; 67 unsigned long pcb_r28; 68 unsigned long pcb_r29; 69 unsigned long pcb_r30; 70 unsigned long pcb_sp; /* kernel stack pointer */ 71 /* floating-point state */ 72 unsigned long pcb_fcr62; 73 unsigned long pcb_fcr63; 74 }; 75 76 struct pcb { 77 struct m88100_pcb kernel_state; 78 struct trapframe user_state; 79 int pcb_onfault; 80 }; 81 82 /* 83 * Location of saved user registers for the proc. 84 */ 85 #define USER_REGS(p) \ 86 (((struct reg *)(&((p)->p_addr->u_pcb.user_state)))) 87 88 #endif /* _M88K_PCB_H_ */ 89