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Commit | Line | Data |
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a6a31139 | 1 | /* |
1da177e4 LT |
2 | * linux/arch/sh/kernel/irq.c |
3 | * | |
4 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar | |
5 | * | |
6 | * | |
7 | * SuperH version: Copyright (C) 1999 Niibe Yutaka | |
8 | */ | |
bf3a00f8 | 9 | #include <linux/irq.h> |
1da177e4 | 10 | #include <linux/interrupt.h> |
a6a31139 | 11 | #include <linux/module.h> |
bf3a00f8 | 12 | #include <linux/kernel_stat.h> |
1da177e4 | 13 | #include <linux/seq_file.h> |
ba93483f | 14 | #include <linux/ftrace.h> |
bf3a00f8 | 15 | #include <asm/processor.h> |
be782df5 | 16 | #include <asm/machvec.h> |
a6a31139 PM |
17 | #include <asm/uaccess.h> |
18 | #include <asm/thread_info.h> | |
f15cbe6f | 19 | #include <cpu/mmu_context.h> |
1da177e4 | 20 | |
35f3c518 PM |
21 | atomic_t irq_err_count; |
22 | ||
1da177e4 LT |
23 | /* |
24 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
25 | * each architecture has to answer this themselves, it doesn't deserve | |
26 | * a generic callback i think. | |
27 | */ | |
28 | void ack_bad_irq(unsigned int irq) | |
29 | { | |
baf4326e | 30 | atomic_inc(&irq_err_count); |
1da177e4 LT |
31 | printk("unexpected IRQ trap at vector %02x\n", irq); |
32 | } | |
33 | ||
34 | #if defined(CONFIG_PROC_FS) | |
fa1d43ab PM |
35 | /* |
36 | * /proc/interrupts printing: | |
37 | */ | |
38 | static int show_other_interrupts(struct seq_file *p, int prec) | |
39 | { | |
731ba330 PM |
40 | int j; |
41 | ||
42 | seq_printf(p, "%*s: ", prec, "NMI"); | |
43 | for_each_online_cpu(j) | |
44 | seq_printf(p, "%10u ", irq_stat[j].__nmi_count); | |
45 | seq_printf(p, " Non-maskable interrupts\n"); | |
46 | ||
fa1d43ab | 47 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
731ba330 | 48 | |
fa1d43ab PM |
49 | return 0; |
50 | } | |
51 | ||
1da177e4 LT |
52 | int show_interrupts(struct seq_file *p, void *v) |
53 | { | |
fa1d43ab PM |
54 | unsigned long flags, any_count = 0; |
55 | int i = *(loff_t *)v, j, prec; | |
56 | struct irqaction *action; | |
57 | struct irq_desc *desc; | |
58 | ||
59 | if (i > nr_irqs) | |
60 | return 0; | |
61 | ||
62 | for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) | |
63 | j *= 10; | |
64 | ||
65 | if (i == nr_irqs) | |
66 | return show_other_interrupts(p, prec); | |
1da177e4 LT |
67 | |
68 | if (i == 0) { | |
fa1d43ab | 69 | seq_printf(p, "%*s", prec + 8, ""); |
394e3902 | 70 | for_each_online_cpu(j) |
fa1d43ab | 71 | seq_printf(p, "CPU%-8d", j); |
1da177e4 LT |
72 | seq_putc(p, '\n'); |
73 | } | |
74 | ||
fa1d43ab PM |
75 | desc = irq_to_desc(i); |
76 | if (!desc) | |
77 | return 0; | |
78 | ||
239007b8 | 79 | raw_spin_lock_irqsave(&desc->lock, flags); |
fa1d43ab PM |
80 | for_each_online_cpu(j) |
81 | any_count |= kstat_irqs_cpu(i, j); | |
82 | action = desc->action; | |
83 | if (!action && !any_count) | |
84 | goto out; | |
1da177e4 | 85 | |
fa1d43ab PM |
86 | seq_printf(p, "%*d: ", prec, i); |
87 | for_each_online_cpu(j) | |
88 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); | |
89 | seq_printf(p, " %14s", desc->chip->name); | |
90 | seq_printf(p, "-%-8s", desc->name); | |
91 | ||
92 | if (action) { | |
93 | seq_printf(p, " %s", action->name); | |
94 | while ((action = action->next) != NULL) | |
1da177e4 | 95 | seq_printf(p, ", %s", action->name); |
fa1d43ab | 96 | } |
35f3c518 | 97 | |
fa1d43ab PM |
98 | seq_putc(p, '\n'); |
99 | out: | |
239007b8 | 100 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 LT |
101 | return 0; |
102 | } | |
103 | #endif | |
104 | ||
110ed282 | 105 | #ifdef CONFIG_IRQSTACKS |
a6a31139 PM |
106 | /* |
107 | * per-CPU IRQ handling contexts (thread information and stack) | |
108 | */ | |
109 | union irq_ctx { | |
110 | struct thread_info tinfo; | |
111 | u32 stack[THREAD_SIZE/sizeof(u32)]; | |
112 | }; | |
113 | ||
1dc41e58 PM |
114 | static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly; |
115 | static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly; | |
a6a31139 PM |
116 | #endif |
117 | ||
ba93483f | 118 | asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs) |
bf3a00f8 | 119 | { |
f0bc814c | 120 | struct pt_regs *old_regs = set_irq_regs(regs); |
110ed282 | 121 | #ifdef CONFIG_IRQSTACKS |
a6a31139 PM |
122 | union irq_ctx *curctx, *irqctx; |
123 | #endif | |
1da177e4 LT |
124 | |
125 | irq_enter(); | |
1e1030dc | 126 | irq = irq_demux(irq); |
a6a31139 | 127 | |
110ed282 | 128 | #ifdef CONFIG_IRQSTACKS |
a6a31139 PM |
129 | curctx = (union irq_ctx *)current_thread_info(); |
130 | irqctx = hardirq_ctx[smp_processor_id()]; | |
131 | ||
132 | /* | |
133 | * this is where we switch to the IRQ stack. However, if we are | |
134 | * already using the IRQ stack (because we interrupted a hardirq | |
135 | * handler) we can't do that and just have to keep using the | |
136 | * current stack (which is the irq stack already after all) | |
137 | */ | |
138 | if (curctx != irqctx) { | |
139 | u32 *isp; | |
140 | ||
141 | isp = (u32 *)((char *)irqctx + sizeof(*irqctx)); | |
142 | irqctx->tinfo.task = curctx->tinfo.task; | |
143 | irqctx->tinfo.previous_sp = current_stack_pointer; | |
144 | ||
1dc41e58 PM |
145 | /* |
146 | * Copy the softirq bits in preempt_count so that the | |
147 | * softirq checks work in the hardirq context. | |
148 | */ | |
149 | irqctx->tinfo.preempt_count = | |
150 | (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) | | |
151 | (curctx->tinfo.preempt_count & SOFTIRQ_MASK); | |
152 | ||
a6a31139 PM |
153 | __asm__ __volatile__ ( |
154 | "mov %0, r4 \n" | |
1dc41e58 | 155 | "mov r15, r8 \n" |
baf4326e | 156 | "jsr @%1 \n" |
a6a31139 | 157 | /* swith to the irq stack */ |
baf4326e | 158 | " mov %2, r15 \n" |
a6a31139 | 159 | /* restore the stack (ring zero) */ |
1dc41e58 | 160 | "mov r8, r15 \n" |
a6a31139 | 161 | : /* no outputs */ |
35f3c518 | 162 | : "r" (irq), "r" (generic_handle_irq), "r" (isp) |
a6a31139 PM |
163 | : "memory", "r0", "r1", "r2", "r3", "r4", |
164 | "r5", "r6", "r7", "r8", "t", "pr" | |
165 | ); | |
166 | } else | |
167 | #endif | |
35f3c518 | 168 | generic_handle_irq(irq); |
a6a31139 | 169 | |
1da177e4 | 170 | irq_exit(); |
a6a31139 | 171 | |
35f3c518 | 172 | set_irq_regs(old_regs); |
1da177e4 LT |
173 | return 1; |
174 | } | |
a6a31139 | 175 | |
110ed282 | 176 | #ifdef CONFIG_IRQSTACKS |
02b7da37 | 177 | static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss; |
a6a31139 | 178 | |
02b7da37 | 179 | static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss; |
a6a31139 PM |
180 | |
181 | /* | |
182 | * allocate per-cpu stacks for hardirq and for softirq processing | |
183 | */ | |
184 | void irq_ctx_init(int cpu) | |
185 | { | |
186 | union irq_ctx *irqctx; | |
187 | ||
188 | if (hardirq_ctx[cpu]) | |
189 | return; | |
190 | ||
191 | irqctx = (union irq_ctx *)&hardirq_stack[cpu * THREAD_SIZE]; | |
192 | irqctx->tinfo.task = NULL; | |
193 | irqctx->tinfo.exec_domain = NULL; | |
194 | irqctx->tinfo.cpu = cpu; | |
195 | irqctx->tinfo.preempt_count = HARDIRQ_OFFSET; | |
196 | irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); | |
197 | ||
198 | hardirq_ctx[cpu] = irqctx; | |
199 | ||
200 | irqctx = (union irq_ctx *)&softirq_stack[cpu * THREAD_SIZE]; | |
201 | irqctx->tinfo.task = NULL; | |
202 | irqctx->tinfo.exec_domain = NULL; | |
203 | irqctx->tinfo.cpu = cpu; | |
1dc41e58 | 204 | irqctx->tinfo.preempt_count = 0; |
a6a31139 PM |
205 | irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); |
206 | ||
207 | softirq_ctx[cpu] = irqctx; | |
208 | ||
209 | printk("CPU %u irqstacks, hard=%p soft=%p\n", | |
210 | cpu, hardirq_ctx[cpu], softirq_ctx[cpu]); | |
211 | } | |
212 | ||
213 | void irq_ctx_exit(int cpu) | |
214 | { | |
215 | hardirq_ctx[cpu] = NULL; | |
216 | } | |
217 | ||
a6a31139 PM |
218 | asmlinkage void do_softirq(void) |
219 | { | |
220 | unsigned long flags; | |
221 | struct thread_info *curctx; | |
222 | union irq_ctx *irqctx; | |
223 | u32 *isp; | |
224 | ||
225 | if (in_interrupt()) | |
226 | return; | |
227 | ||
228 | local_irq_save(flags); | |
229 | ||
230 | if (local_softirq_pending()) { | |
231 | curctx = current_thread_info(); | |
232 | irqctx = softirq_ctx[smp_processor_id()]; | |
233 | irqctx->tinfo.task = curctx->task; | |
234 | irqctx->tinfo.previous_sp = current_stack_pointer; | |
235 | ||
236 | /* build the stack frame on the softirq stack */ | |
237 | isp = (u32 *)((char *)irqctx + sizeof(*irqctx)); | |
238 | ||
239 | __asm__ __volatile__ ( | |
240 | "mov r15, r9 \n" | |
241 | "jsr @%0 \n" | |
242 | /* switch to the softirq stack */ | |
243 | " mov %1, r15 \n" | |
244 | /* restore the thread stack */ | |
245 | "mov r9, r15 \n" | |
246 | : /* no outputs */ | |
247 | : "r" (__do_softirq), "r" (isp) | |
a6a31139 PM |
248 | : "memory", "r0", "r1", "r2", "r3", "r4", |
249 | "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr" | |
250 | ); | |
1dc41e58 PM |
251 | |
252 | /* | |
253 | * Shouldnt happen, we returned above if in_interrupt(): | |
254 | */ | |
255 | WARN_ON_ONCE(softirq_count()); | |
a6a31139 PM |
256 | } |
257 | ||
258 | local_irq_restore(flags); | |
259 | } | |
a6a31139 | 260 | #endif |
ea0f8fea JL |
261 | |
262 | void __init init_IRQ(void) | |
263 | { | |
90015c89 | 264 | plat_irq_setup(); |
ea0f8fea | 265 | |
45b9deaf PM |
266 | /* |
267 | * Pin any of the legacy IRQ vectors that haven't already been | |
268 | * grabbed by the platform | |
269 | */ | |
270 | reserve_irq_legacy(); | |
271 | ||
ea0f8fea JL |
272 | /* Perform the machine specific initialisation */ |
273 | if (sh_mv.mv_init_irq) | |
274 | sh_mv.mv_init_irq(); | |
275 | ||
276 | irq_ctx_init(smp_processor_id()); | |
277 | } | |
d8586ba6 PM |
278 | |
279 | #ifdef CONFIG_SPARSE_IRQ | |
280 | int __init arch_probe_nr_irqs(void) | |
281 | { | |
282 | nr_irqs = sh_mv.mv_nr_irqs; | |
283 | return 0; | |
284 | } | |
285 | #endif |