1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1994 Waldorf GMBH
7  * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
8  * Copyright (C) 1996 Paul M. Antoine
9  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10  * Copyright (C) 2004  Maciej W. Rozycki
11  */
12 #ifndef __ASM_CPU_INFO_H
13 #define __ASM_CPU_INFO_H
14 
15 #include <linux/cache.h>
16 #include <linux/types.h>
17 
18 #include <asm/mipsregs.h>
19 
20 /*
21  * Descriptor for a cache
22  */
23 struct cache_desc {
24 	unsigned int waysize;	/* Bytes per way */
25 	unsigned short sets;	/* Number of lines per set */
26 	unsigned char ways;	/* Number of ways */
27 	unsigned char linesz;	/* Size of line in bytes */
28 	unsigned char waybit;	/* Bits to select in a cache set */
29 	unsigned char flags;	/* Flags describing cache properties */
30 };
31 
32 struct guest_info {
33 	unsigned long		ases;
34 	unsigned long		ases_dyn;
35 	unsigned long long	options;
36 	unsigned long long	options_dyn;
37 	int			tlbsize;
38 	u8			conf;
39 	u8			kscratch_mask;
40 };
41 
42 /*
43  * Flag definitions
44  */
45 #define MIPS_CACHE_NOT_PRESENT	0x00000001
46 #define MIPS_CACHE_VTAG		0x00000002	/* Virtually tagged cache */
47 #define MIPS_CACHE_ALIASES	0x00000004	/* Cache could have aliases */
48 #define MIPS_CACHE_IC_F_DC	0x00000008	/* Ic can refill from D-cache */
49 #define MIPS_IC_SNOOPS_REMOTE	0x00000010	/* Ic snoops remote stores */
50 #define MIPS_CACHE_PINDEX	0x00000020	/* Physically indexed cache */
51 
52 struct cpuinfo_mips {
53 	u64			asid_cache;
54 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
55 	unsigned long		asid_mask;
56 #endif
57 
58 	/*
59 	 * Capability and feature descriptor structure for MIPS CPU
60 	 */
61 	unsigned long		ases;
62 	unsigned long long	options;
63 	unsigned int		udelay_val;
64 	unsigned int		processor_id;
65 	unsigned int		fpu_id;
66 	unsigned int		fpu_csr31;
67 	unsigned int		fpu_msk31;
68 	unsigned int		msa_id;
69 	unsigned int		cputype;
70 	int			isa_level;
71 	int			tlbsize;
72 	int			tlbsizevtlb;
73 	int			tlbsizeftlbsets;
74 	int			tlbsizeftlbways;
75 	struct cache_desc	icache; /* Primary I-cache */
76 	struct cache_desc	dcache; /* Primary D or combined I/D cache */
77 	struct cache_desc	vcache; /* Victim cache, between pcache and scache */
78 	struct cache_desc	scache; /* Secondary cache */
79 	struct cache_desc	tcache; /* Tertiary/split secondary cache */
80 	int			srsets; /* Shadow register sets */
81 	int			package;/* physical package number */
82 	unsigned int		globalnumber;
83 #ifdef CONFIG_64BIT
84 	int			vmbits; /* Virtual memory size in bits */
85 #endif
86 	void			*data;	/* Additional data */
87 	unsigned int		watch_reg_count;   /* Number that exist */
88 	unsigned int		watch_reg_use_cnt; /* Usable by ptrace */
89 #define NUM_WATCH_REGS 4
90 	u16			watch_reg_masks[NUM_WATCH_REGS];
91 	unsigned int		kscratch_mask; /* Usable KScratch mask. */
92 	/*
93 	 * Cache Coherency attribute for write-combine memory writes.
94 	 * (shifted by _CACHE_SHIFT)
95 	 */
96 	unsigned int		writecombine;
97 	/*
98 	 * Simple counter to prevent enabling HTW in nested
99 	 * htw_start/htw_stop calls
100 	 */
101 	unsigned int		htw_seq;
102 
103 	/* VZ & Guest features */
104 	struct guest_info	guest;
105 	unsigned int		gtoffset_mask;
106 	unsigned int		guestid_mask;
107 	unsigned int		guestid_cache;
108 
109 #ifdef CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION
110 	/* CPUCFG data for this CPU, synthesized at probe time.
111 	 *
112 	 * CPUCFG select 0 is PRId, 4 and above are unimplemented for now.
113 	 * So the only stored values are for CPUCFG selects 1-3 inclusive.
114 	 */
115 	u32 loongson3_cpucfg_data[3];
116 #endif
117 } __attribute__((aligned(SMP_CACHE_BYTES)));
118 
119 extern struct cpuinfo_mips cpu_data[];
120 #define current_cpu_data cpu_data[smp_processor_id()]
121 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
122 #define boot_cpu_data cpu_data[0]
123 
124 extern void cpu_probe(void);
125 extern void cpu_report(void);
126 
127 extern const char *__cpu_name[];
128 #define cpu_name_string()	__cpu_name[raw_smp_processor_id()]
129 
130 struct seq_file;
131 struct notifier_block;
132 
133 extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
134 extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
135 
136 #define proc_cpuinfo_notifier(fn, pri)					\
137 ({									\
138 	static struct notifier_block fn##_nb = {			\
139 		.notifier_call = fn,					\
140 		.priority = pri						\
141 	};								\
142 									\
143 	register_proc_cpuinfo_notifier(&fn##_nb);			\
144 })
145 
146 struct proc_cpuinfo_notifier_args {
147 	struct seq_file *m;
148 	unsigned long n;
149 };
150 
cpu_cluster(struct cpuinfo_mips * cpuinfo)151 static inline unsigned int cpu_cluster(struct cpuinfo_mips *cpuinfo)
152 {
153 	/* Optimisation for systems where multiple clusters aren't used */
154 	if (!IS_ENABLED(CONFIG_CPU_MIPSR5) && !IS_ENABLED(CONFIG_CPU_MIPSR6))
155 		return 0;
156 
157 	return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CLUSTER) >>
158 		MIPS_GLOBALNUMBER_CLUSTER_SHF;
159 }
160 
cpu_core(struct cpuinfo_mips * cpuinfo)161 static inline unsigned int cpu_core(struct cpuinfo_mips *cpuinfo)
162 {
163 	return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CORE) >>
164 		MIPS_GLOBALNUMBER_CORE_SHF;
165 }
166 
cpu_vpe_id(struct cpuinfo_mips * cpuinfo)167 static inline unsigned int cpu_vpe_id(struct cpuinfo_mips *cpuinfo)
168 {
169 	/* Optimisation for systems where VP(E)s aren't used */
170 	if (!IS_ENABLED(CONFIG_MIPS_MT_SMP) && !IS_ENABLED(CONFIG_CPU_MIPSR6))
171 		return 0;
172 
173 	return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_VP) >>
174 		MIPS_GLOBALNUMBER_VP_SHF;
175 }
176 
177 extern void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster);
178 extern void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core);
179 extern void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe);
180 
cpus_are_siblings(int cpua,int cpub)181 static inline bool cpus_are_siblings(int cpua, int cpub)
182 {
183 	struct cpuinfo_mips *infoa = &cpu_data[cpua];
184 	struct cpuinfo_mips *infob = &cpu_data[cpub];
185 	unsigned int gnuma, gnumb;
186 
187 	if (infoa->package != infob->package)
188 		return false;
189 
190 	gnuma = infoa->globalnumber & ~MIPS_GLOBALNUMBER_VP;
191 	gnumb = infob->globalnumber & ~MIPS_GLOBALNUMBER_VP;
192 	if (gnuma != gnumb)
193 		return false;
194 
195 	return true;
196 }
197 
cpu_asid_inc(void)198 static inline unsigned long cpu_asid_inc(void)
199 {
200 	return 1 << CONFIG_MIPS_ASID_SHIFT;
201 }
202 
cpu_asid_mask(struct cpuinfo_mips * cpuinfo)203 static inline unsigned long cpu_asid_mask(struct cpuinfo_mips *cpuinfo)
204 {
205 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
206 	return cpuinfo->asid_mask;
207 #endif
208 	return ((1 << CONFIG_MIPS_ASID_BITS) - 1) << CONFIG_MIPS_ASID_SHIFT;
209 }
210 
set_cpu_asid_mask(struct cpuinfo_mips * cpuinfo,unsigned long asid_mask)211 static inline void set_cpu_asid_mask(struct cpuinfo_mips *cpuinfo,
212 				     unsigned long asid_mask)
213 {
214 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
215 	cpuinfo->asid_mask = asid_mask;
216 #endif
217 }
218 
219 #endif /* __ASM_CPU_INFO_H */
220