This source file includes following definitions.
- riscv_of_processor_hartid
- print_isa
- print_mmu
- c_start
- c_next
- c_stop
- c_show
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5
6 #include <linux/init.h>
7 #include <linux/seq_file.h>
8 #include <linux/of.h>
9 #include <asm/smp.h>
10
11
12
13
14
15 int riscv_of_processor_hartid(struct device_node *node)
16 {
17 const char *isa;
18 u32 hart;
19
20 if (!of_device_is_compatible(node, "riscv")) {
21 pr_warn("Found incompatible CPU\n");
22 return -ENODEV;
23 }
24
25 if (of_property_read_u32(node, "reg", &hart)) {
26 pr_warn("Found CPU without hart ID\n");
27 return -ENODEV;
28 }
29
30 if (!of_device_is_available(node)) {
31 pr_info("CPU with hartid=%d is not available\n", hart);
32 return -ENODEV;
33 }
34
35 if (of_property_read_string(node, "riscv,isa", &isa)) {
36 pr_warn("CPU with hartid=%d has no \"riscv,isa\" property\n", hart);
37 return -ENODEV;
38 }
39 if (isa[0] != 'r' || isa[1] != 'v') {
40 pr_warn("CPU with hartid=%d has an invalid ISA of \"%s\"\n", hart, isa);
41 return -ENODEV;
42 }
43
44 return hart;
45 }
46
47 #ifdef CONFIG_PROC_FS
48
49 static void print_isa(struct seq_file *f, const char *orig_isa)
50 {
51 static const char *ext = "mafdcsu";
52 const char *isa = orig_isa;
53 const char *e;
54
55
56
57
58
59 #if defined(CONFIG_32BIT)
60 if (strncmp(isa, "rv32i", 5) != 0)
61 return;
62 #elif defined(CONFIG_64BIT)
63 if (strncmp(isa, "rv64i", 5) != 0)
64 return;
65 #endif
66
67
68 seq_puts(f, "isa\t\t: ");
69 seq_write(f, isa, 5);
70 isa += 5;
71
72
73
74
75
76
77
78 for (e = ext; *e != '\0'; ++e) {
79 if (isa[0] == e[0]) {
80 if (isa[0] != 's')
81 seq_write(f, isa, 1);
82
83 isa++;
84 }
85 }
86 seq_puts(f, "\n");
87
88
89
90
91
92 if (isa[0] != '\0')
93 pr_info("unsupported ISA \"%s\" in device tree\n", orig_isa);
94 }
95
96 static void print_mmu(struct seq_file *f, const char *mmu_type)
97 {
98 #if defined(CONFIG_32BIT)
99 if (strcmp(mmu_type, "riscv,sv32") != 0)
100 return;
101 #elif defined(CONFIG_64BIT)
102 if (strcmp(mmu_type, "riscv,sv39") != 0 &&
103 strcmp(mmu_type, "riscv,sv48") != 0)
104 return;
105 #endif
106
107 seq_printf(f, "mmu\t\t: %s\n", mmu_type+6);
108 }
109
110 static void *c_start(struct seq_file *m, loff_t *pos)
111 {
112 *pos = cpumask_next(*pos - 1, cpu_online_mask);
113 if ((*pos) < nr_cpu_ids)
114 return (void *)(uintptr_t)(1 + *pos);
115 return NULL;
116 }
117
118 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
119 {
120 (*pos)++;
121 return c_start(m, pos);
122 }
123
124 static void c_stop(struct seq_file *m, void *v)
125 {
126 }
127
128 static int c_show(struct seq_file *m, void *v)
129 {
130 unsigned long cpu_id = (unsigned long)v - 1;
131 struct device_node *node = of_get_cpu_node(cpu_id, NULL);
132 const char *compat, *isa, *mmu;
133
134 seq_printf(m, "processor\t: %lu\n", cpu_id);
135 seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
136 if (!of_property_read_string(node, "riscv,isa", &isa))
137 print_isa(m, isa);
138 if (!of_property_read_string(node, "mmu-type", &mmu))
139 print_mmu(m, mmu);
140 if (!of_property_read_string(node, "compatible", &compat)
141 && strcmp(compat, "riscv"))
142 seq_printf(m, "uarch\t\t: %s\n", compat);
143 seq_puts(m, "\n");
144 of_node_put(node);
145
146 return 0;
147 }
148
149 const struct seq_operations cpuinfo_op = {
150 .start = c_start,
151 .next = c_next,
152 .stop = c_stop,
153 .show = c_show
154 };
155
156 #endif