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 } __attribute__((aligned(SMP_CACHE_BYTES)));
109
110 extern struct cpuinfo_mips cpu_data[];
111 #define current_cpu_data cpu_data[smp_processor_id()]
112 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
113 #define boot_cpu_data cpu_data[0]
114
115 extern void cpu_probe(void);
116 extern void cpu_report(void);
117
118 extern const char *__cpu_name[];
119 #define cpu_name_string() __cpu_name[raw_smp_processor_id()]
120
121 struct seq_file;
122 struct notifier_block;
123
124 extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
125 extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
126
127 #define proc_cpuinfo_notifier(fn, pri) \
128 ({ \
129 static struct notifier_block fn##_nb = { \
130 .notifier_call = fn, \
131 .priority = pri \
132 }; \
133 \
134 register_proc_cpuinfo_notifier(&fn##_nb); \
135 })
136
137 struct proc_cpuinfo_notifier_args {
138 struct seq_file *m;
139 unsigned long n;
140 };
141
cpu_cluster(struct cpuinfo_mips * cpuinfo)142 static inline unsigned int cpu_cluster(struct cpuinfo_mips *cpuinfo)
143 {
144 /* Optimisation for systems where multiple clusters aren't used */
145 if (!IS_ENABLED(CONFIG_CPU_MIPSR6))
146 return 0;
147
148 return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CLUSTER) >>
149 MIPS_GLOBALNUMBER_CLUSTER_SHF;
150 }
151
cpu_core(struct cpuinfo_mips * cpuinfo)152 static inline unsigned int cpu_core(struct cpuinfo_mips *cpuinfo)
153 {
154 return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CORE) >>
155 MIPS_GLOBALNUMBER_CORE_SHF;
156 }
157
cpu_vpe_id(struct cpuinfo_mips * cpuinfo)158 static inline unsigned int cpu_vpe_id(struct cpuinfo_mips *cpuinfo)
159 {
160 /* Optimisation for systems where VP(E)s aren't used */
161 if (!IS_ENABLED(CONFIG_MIPS_MT_SMP) && !IS_ENABLED(CONFIG_CPU_MIPSR6))
162 return 0;
163
164 return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_VP) >>
165 MIPS_GLOBALNUMBER_VP_SHF;
166 }
167
168 extern void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster);
169 extern void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core);
170 extern void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe);
171
cpus_are_siblings(int cpua,int cpub)172 static inline bool cpus_are_siblings(int cpua, int cpub)
173 {
174 struct cpuinfo_mips *infoa = &cpu_data[cpua];
175 struct cpuinfo_mips *infob = &cpu_data[cpub];
176 unsigned int gnuma, gnumb;
177
178 if (infoa->package != infob->package)
179 return false;
180
181 gnuma = infoa->globalnumber & ~MIPS_GLOBALNUMBER_VP;
182 gnumb = infob->globalnumber & ~MIPS_GLOBALNUMBER_VP;
183 if (gnuma != gnumb)
184 return false;
185
186 return true;
187 }
188
cpu_asid_inc(void)189 static inline unsigned long cpu_asid_inc(void)
190 {
191 return 1 << CONFIG_MIPS_ASID_SHIFT;
192 }
193
cpu_asid_mask(struct cpuinfo_mips * cpuinfo)194 static inline unsigned long cpu_asid_mask(struct cpuinfo_mips *cpuinfo)
195 {
196 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
197 return cpuinfo->asid_mask;
198 #endif
199 return ((1 << CONFIG_MIPS_ASID_BITS) - 1) << CONFIG_MIPS_ASID_SHIFT;
200 }
201
set_cpu_asid_mask(struct cpuinfo_mips * cpuinfo,unsigned long asid_mask)202 static inline void set_cpu_asid_mask(struct cpuinfo_mips *cpuinfo,
203 unsigned long asid_mask)
204 {
205 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
206 cpuinfo->asid_mask = asid_mask;
207 #endif
208 }
209
210 #endif /* __ASM_CPU_INFO_H */
211