1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * File:	mca.h
4  * Purpose:	Machine check handling specific defines
5  *
6  * Copyright (C) 1999, 2004 Silicon Graphics, Inc.
7  * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
8  * Copyright (C) Srinivasa Thirumalachar <sprasad@engr.sgi.com>
9  * Copyright (C) Russ Anderson <rja@sgi.com>
10  */
11 
12 #ifndef _ASM_IA64_MCA_H
13 #define _ASM_IA64_MCA_H
14 
15 #if !defined(__ASSEMBLY__)
16 
17 #include <linux/percpu.h>
18 #include <linux/threads.h>
19 #include <linux/types.h>
20 #include <asm/ptrace.h>
21 
22 #define IA64_MCA_RENDEZ_TIMEOUT		(20 * 1000)	/* value in milliseconds - 20 seconds */
23 
24 typedef struct ia64_fptr {
25 	unsigned long fp;
26 	unsigned long gp;
27 } ia64_fptr_t;
28 
29 typedef union cmcv_reg_u {
30 	u64	cmcv_regval;
31 	struct	{
32 		u64	cmcr_vector		: 8;
33 		u64	cmcr_reserved1		: 4;
34 		u64	cmcr_ignored1		: 1;
35 		u64	cmcr_reserved2		: 3;
36 		u64	cmcr_mask		: 1;
37 		u64	cmcr_ignored2		: 47;
38 	} cmcv_reg_s;
39 
40 } cmcv_reg_t;
41 
42 #define cmcv_mask		cmcv_reg_s.cmcr_mask
43 #define cmcv_vector		cmcv_reg_s.cmcr_vector
44 
45 enum {
46 	IA64_MCA_RENDEZ_CHECKIN_NOTDONE	=	0x0,
47 	IA64_MCA_RENDEZ_CHECKIN_DONE	=	0x1,
48 	IA64_MCA_RENDEZ_CHECKIN_INIT	=	0x2,
49 	IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA	=	0x3,
50 };
51 
52 /* Information maintained by the MC infrastructure */
53 typedef struct ia64_mc_info_s {
54 	u64		imi_mca_handler;
55 	size_t		imi_mca_handler_size;
56 	u64		imi_monarch_init_handler;
57 	size_t		imi_monarch_init_handler_size;
58 	u64		imi_slave_init_handler;
59 	size_t		imi_slave_init_handler_size;
60 	u8		imi_rendez_checkin[NR_CPUS];
61 
62 } ia64_mc_info_t;
63 
64 /* Handover state from SAL to OS and vice versa, for both MCA and INIT events.
65  * Besides the handover state, it also contains some saved registers from the
66  * time of the event.
67  * Note: mca_asm.S depends on the precise layout of this structure.
68  */
69 
70 struct ia64_sal_os_state {
71 
72 	/* SAL to OS */
73 	unsigned long		os_gp;			/* GP of the os registered with the SAL, physical */
74 	unsigned long		pal_proc;		/* PAL_PROC entry point, physical */
75 	unsigned long		sal_proc;		/* SAL_PROC entry point, physical */
76 	unsigned long		rv_rc;			/* MCA - Rendezvous state, INIT - reason code */
77 	unsigned long		proc_state_param;	/* from R18 */
78 	unsigned long		monarch;		/* 1 for a monarch event, 0 for a slave */
79 
80 	/* common */
81 	unsigned long		sal_ra;			/* Return address in SAL, physical */
82 	unsigned long		sal_gp;			/* GP of the SAL - physical */
83 	struct pal_min_state_area *pal_min_state;	/* from R17.  physical in asm, virtual in C */
84 	/* Previous values of IA64_KR(CURRENT) and IA64_KR(CURRENT_STACK).
85 	 * Note: if the MCA/INIT recovery code wants to resume to a new context
86 	 * then it must change these values to reflect the new kernel stack.
87 	 */
88 	unsigned long		prev_IA64_KR_CURRENT;	/* previous value of IA64_KR(CURRENT) */
89 	unsigned long		prev_IA64_KR_CURRENT_STACK;
90 	struct task_struct	*prev_task;		/* previous task, NULL if it is not useful */
91 	/* Some interrupt registers are not saved in minstate, pt_regs or
92 	 * switch_stack.  Because MCA/INIT can occur when interrupts are
93 	 * disabled, we need to save the additional interrupt registers over
94 	 * MCA/INIT and resume.
95 	 */
96 	unsigned long		isr;
97 	unsigned long		ifa;
98 	unsigned long		itir;
99 	unsigned long		iipa;
100 	unsigned long		iim;
101 	unsigned long		iha;
102 
103 	/* OS to SAL */
104 	unsigned long		os_status;		/* OS status to SAL, enum below */
105 	unsigned long		context;		/* 0 if return to same context
106 							   1 if return to new context */
107 
108 	/* I-resources */
109 	unsigned long		iip;
110 	unsigned long		ipsr;
111 	unsigned long		ifs;
112 };
113 
114 enum {
115 	IA64_MCA_CORRECTED	=	0x0,	/* Error has been corrected by OS_MCA */
116 	IA64_MCA_WARM_BOOT	=	-1,	/* Warm boot of the system need from SAL */
117 	IA64_MCA_COLD_BOOT	=	-2,	/* Cold boot of the system need from SAL */
118 	IA64_MCA_HALT		=	-3	/* System to be halted by SAL */
119 };
120 
121 enum {
122 	IA64_INIT_RESUME	=	0x0,	/* Resume after return from INIT */
123 	IA64_INIT_WARM_BOOT	=	-1,	/* Warm boot of the system need from SAL */
124 };
125 
126 enum {
127 	IA64_MCA_SAME_CONTEXT	=	0x0,	/* SAL to return to same context */
128 	IA64_MCA_NEW_CONTEXT	=	-1	/* SAL to return to new context */
129 };
130 
131 /* Per-CPU MCA state that is too big for normal per-CPU variables.  */
132 
133 struct ia64_mca_cpu {
134 	u64 mca_stack[KERNEL_STACK_SIZE/8];
135 	u64 init_stack[KERNEL_STACK_SIZE/8];
136 };
137 
138 /* Array of physical addresses of each CPU's MCA area.  */
139 extern unsigned long __per_cpu_mca[NR_CPUS];
140 
141 extern int cpe_vector;
142 extern int ia64_cpe_irq;
143 extern void ia64_mca_init(void);
144 extern void ia64_mca_irq_init(void);
145 extern void ia64_mca_cpu_init(void *);
146 extern void ia64_os_mca_dispatch(void);
147 extern void ia64_os_mca_dispatch_end(void);
148 extern void ia64_mca_ucmc_handler(struct pt_regs *, struct ia64_sal_os_state *);
149 extern void ia64_init_handler(struct pt_regs *,
150 			      struct switch_stack *,
151 			      struct ia64_sal_os_state *);
152 extern void ia64_os_init_on_kdump(void);
153 extern void ia64_monarch_init_handler(void);
154 extern void ia64_slave_init_handler(void);
155 extern void ia64_mca_cmc_vector_setup(void);
156 extern int  ia64_reg_MCA_extension(int (*fn)(void *, struct ia64_sal_os_state *));
157 extern void ia64_unreg_MCA_extension(void);
158 extern unsigned long ia64_get_rnat(unsigned long *);
159 extern void ia64_set_psr_mc(void);
160 extern void ia64_mca_printk(const char * fmt, ...)
161 	 __attribute__ ((format (printf, 1, 2)));
162 
163 struct ia64_mca_notify_die {
164 	struct ia64_sal_os_state *sos;
165 	int *monarch_cpu;
166 	int *data;
167 };
168 
169 DECLARE_PER_CPU(u64, ia64_mca_pal_base);
170 
171 #else	/* __ASSEMBLY__ */
172 
173 #define IA64_MCA_CORRECTED	0x0	/* Error has been corrected by OS_MCA */
174 #define IA64_MCA_WARM_BOOT	-1	/* Warm boot of the system need from SAL */
175 #define IA64_MCA_COLD_BOOT	-2	/* Cold boot of the system need from SAL */
176 #define IA64_MCA_HALT		-3	/* System to be halted by SAL */
177 
178 #define IA64_INIT_RESUME	0x0	/* Resume after return from INIT */
179 #define IA64_INIT_WARM_BOOT	-1	/* Warm boot of the system need from SAL */
180 
181 #define IA64_MCA_SAME_CONTEXT	0x0	/* SAL to return to same context */
182 #define IA64_MCA_NEW_CONTEXT	-1	/* SAL to return to new context */
183 
184 #endif /* !__ASSEMBLY__ */
185 #endif /* _ASM_IA64_MCA_H */
186