4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
7 #include <linux/interrupt.h>
8 #include <linux/profile.h>
9 #include <linux/delay.h>
10 #include <linux/cpu.h>
12 #include <asm/cacheflush.h>
13 #include <asm/tlbflush.h>
18 #define IRQ_CROSS_CALL 15
20 static inline unsigned long
21 swap_ulong(volatile unsigned long *ptr, unsigned long val)
23 __asm__ __volatile__("swap [%1], %0\n\t" :
24 "=&r" (val), "=&r" (ptr) :
25 "0" (val), "1" (ptr));
29 static void smp_setup_percpu_timer(void);
31 void __cpuinit smp4m_callin(void)
33 int cpuid = hard_smp_processor_id();
35 local_flush_cache_all();
36 local_flush_tlb_all();
38 notify_cpu_starting(cpuid);
40 /* Get our local ticker going. */
41 smp_setup_percpu_timer();
44 smp_store_cpu_info(cpuid);
46 local_flush_cache_all();
47 local_flush_tlb_all();
50 * Unblock the master CPU _only_ when the scheduler state
51 * of all secondary CPUs will be up-to-date, so after
52 * the SMP initialization the master will be just allowed
53 * to call the scheduler code.
55 /* Allow master to continue. */
56 swap_ulong(&cpu_callin_map[cpuid], 1);
58 /* XXX: What's up with all the flushes? */
59 local_flush_cache_all();
60 local_flush_tlb_all();
64 /* Fix idle thread fields. */
65 __asm__ __volatile__("ld [%0], %%g6\n\t"
66 : : "r" (¤t_set[cpuid])
67 : "memory" /* paranoid */);
69 /* Attach to the address space of init_task. */
70 atomic_inc(&init_mm.mm_count);
71 current->active_mm = &init_mm;
73 while (!cpu_isset(cpuid, smp_commenced_mask))
78 set_cpu_online(cpuid, true);
82 * Cycle through the processors asking the PROM to start each one.
84 void __init smp4m_boot_cpus(void)
86 smp_setup_percpu_timer();
87 local_flush_cache_all();
90 int __cpuinit smp4m_boot_one_cpu(int i)
92 unsigned long *entry = &sun4m_cpu_startup;
93 struct task_struct *p;
97 cpu_find_by_mid(i, &cpu_node);
99 /* Cook up an idler for this guy. */
101 current_set[i] = task_thread_info(p);
102 /* See trampoline.S for details... */
103 entry += ((i - 1) * 3);
106 * Initialize the contexts table
107 * Since the call to prom_startcpu() trashes the structure,
108 * we need to re-initialize it for each cpu
110 smp_penguin_ctable.which_io = 0;
111 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
112 smp_penguin_ctable.reg_size = 0;
114 /* whirrr, whirrr, whirrrrrrrrr... */
115 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
116 local_flush_cache_all();
117 prom_startcpu(cpu_node, &smp_penguin_ctable, 0, (char *)entry);
119 /* wheee... it's going... */
120 for (timeout = 0; timeout < 10000; timeout++) {
121 if (cpu_callin_map[i])
126 if (!(cpu_callin_map[i])) {
127 printk(KERN_ERR "Processor %d is stuck.\n", i);
131 local_flush_cache_all();
135 void __init smp4m_smp_done(void)
140 /* setup cpu list for irq rotation */
143 for_each_online_cpu(i) {
145 prev = &cpu_data(i).next;
148 local_flush_cache_all();
150 /* Ok, they are spinning and ready to go. */
153 /* At each hardware IRQ, we get this called to forward IRQ reception
154 * to the next processor. The caller must disable the IRQ level being
155 * serviced globally so that there are no double interrupts received.
157 * XXX See sparc64 irq.c.
159 void smp4m_irq_rotate(int cpu)
161 int next = cpu_data(cpu).next;
167 static struct smp_funcall {
174 unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */
175 unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
178 static DEFINE_SPINLOCK(cross_call_lock);
180 /* Cross calls must be serialized, at least currently. */
181 static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
182 unsigned long arg2, unsigned long arg3,
185 register int ncpus = SUN4M_NCPUS;
188 spin_lock_irqsave(&cross_call_lock, flags);
190 /* Init function glue. */
191 ccall_info.func = func;
192 ccall_info.arg1 = arg1;
193 ccall_info.arg2 = arg2;
194 ccall_info.arg3 = arg3;
195 ccall_info.arg4 = arg4;
198 /* Init receive/complete mapping, plus fire the IPI's off. */
202 cpu_clear(smp_processor_id(), mask);
203 cpus_and(mask, cpu_online_map, mask);
204 for (i = 0; i < ncpus; i++) {
205 if (cpu_isset(i, mask)) {
206 ccall_info.processors_in[i] = 0;
207 ccall_info.processors_out[i] = 0;
208 set_cpu_int(i, IRQ_CROSS_CALL);
210 ccall_info.processors_in[i] = 1;
211 ccall_info.processors_out[i] = 1;
221 if (!cpu_isset(i, mask))
223 while (!ccall_info.processors_in[i])
225 } while (++i < ncpus);
229 if (!cpu_isset(i, mask))
231 while (!ccall_info.processors_out[i])
233 } while (++i < ncpus);
235 spin_unlock_irqrestore(&cross_call_lock, flags);
238 /* Running cross calls. */
239 void smp4m_cross_call_irq(void)
241 int i = smp_processor_id();
243 ccall_info.processors_in[i] = 1;
244 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
245 ccall_info.arg4, ccall_info.arg5);
246 ccall_info.processors_out[i] = 1;
249 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
251 struct pt_regs *old_regs;
252 int cpu = smp_processor_id();
254 old_regs = set_irq_regs(regs);
256 sun4m_clear_profile_irq(cpu);
258 profile_tick(CPU_PROFILING);
260 if (!--prof_counter(cpu)) {
261 int user = user_mode(regs);
264 update_process_times(user);
267 prof_counter(cpu) = prof_multiplier(cpu);
269 set_irq_regs(old_regs);
272 static void __cpuinit smp_setup_percpu_timer(void)
274 int cpu = smp_processor_id();
276 prof_counter(cpu) = prof_multiplier(cpu) = 1;
277 load_profile_irq(cpu, lvl14_resolution);
279 if (cpu == boot_cpu_id)
283 static void __init smp4m_blackbox_id(unsigned *addr)
285 int rd = *addr & 0x3e000000;
288 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */
289 addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */
290 addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */
293 static void __init smp4m_blackbox_current(unsigned *addr)
295 int rd = *addr & 0x3e000000;
298 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */
299 addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */
300 addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */
303 void __init sun4m_init_smp(void)
305 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
306 BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
307 BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
308 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);