1 /* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
3 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Based on sun4m's smp.c, which is:
6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/threads.h>
14 #include <linux/smp.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
20 #include <linux/swap.h>
21 #include <linux/profile.h>
22 #include <linux/delay.h>
24 #include <asm/ptrace.h>
25 #include <asm/atomic.h>
26 #include <asm/irq_regs.h>
30 #include <asm/pgalloc.h>
31 #include <asm/pgtable.h>
32 #include <asm/oplib.h>
34 #include <asm/tlbflush.h>
35 #include <asm/cacheflush.h>
36 #include <asm/cpudata.h>
39 #define IRQ_CROSS_CALL 15
41 extern ctxd_t *srmmu_ctx_table_phys;
43 static volatile int smp_processors_ready = 0;
44 static int smp_highest_cpu;
45 extern volatile unsigned long cpu_callin_map[NR_CPUS];
46 extern cpuinfo_sparc cpu_data[NR_CPUS];
47 extern unsigned char boot_cpu_id;
48 extern volatile int smp_process_available;
50 extern cpumask_t smp_commenced_mask;
52 extern int __smp4d_processor_id(void);
54 /* #define SMP_DEBUG */
57 #define SMP_PRINTK(x) printk x
62 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
64 __asm__ __volatile__("swap [%1], %0\n\t" :
65 "=&r" (val), "=&r" (ptr) :
66 "0" (val), "1" (ptr));
70 static void smp_setup_percpu_timer(void);
71 extern void cpu_probe(void);
72 extern void sun4d_distribute_irqs(void);
74 static unsigned char cpu_leds[32];
76 static inline void show_leds(int cpuid)
79 __asm__ __volatile__ ("stba %0, [%1] %2" : :
80 "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]),
81 "r" (ECSR_BASE(cpuid) | BB_LEDS),
85 void __init smp4d_callin(void)
87 int cpuid = hard_smp4d_processor_id();
88 extern spinlock_t sun4d_imsk_lock;
91 /* Show we are alive */
92 cpu_leds[cpuid] = 0x6;
95 /* Enable level15 interrupt, disable level14 interrupt for now */
96 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
98 local_flush_cache_all();
99 local_flush_tlb_all();
101 notify_cpu_starting(cpuid);
103 * Unblock the master CPU _only_ when the scheduler state
104 * of all secondary CPUs will be up-to-date, so after
105 * the SMP initialization the master will be just allowed
106 * to call the scheduler code.
108 /* Get our local ticker going. */
109 smp_setup_percpu_timer();
112 smp_store_cpu_info(cpuid);
113 local_flush_cache_all();
114 local_flush_tlb_all();
116 /* Allow master to continue. */
117 swap((unsigned long *)&cpu_callin_map[cpuid], 1);
118 local_flush_cache_all();
119 local_flush_tlb_all();
123 while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
126 while(current_set[cpuid]->cpu != cpuid)
129 /* Fix idle thread fields. */
130 __asm__ __volatile__("ld [%0], %%g6\n\t"
131 : : "r" (¤t_set[cpuid])
132 : "memory" /* paranoid */);
134 cpu_leds[cpuid] = 0x9;
137 /* Attach to the address space of init_task. */
138 atomic_inc(&init_mm.mm_count);
139 current->active_mm = &init_mm;
141 local_flush_cache_all();
142 local_flush_tlb_all();
144 local_irq_enable(); /* We don't allow PIL 14 yet */
146 while (!cpu_isset(cpuid, smp_commenced_mask))
149 spin_lock_irqsave(&sun4d_imsk_lock, flags);
150 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
151 spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
152 cpu_set(cpuid, cpu_online_map);
156 extern void init_IRQ(void);
157 extern void cpu_panic(void);
160 * Cycle through the processors asking the PROM to start each one.
163 extern struct linux_prom_registers smp_penguin_ctable;
164 extern unsigned long trapbase_cpu1[];
165 extern unsigned long trapbase_cpu2[];
166 extern unsigned long trapbase_cpu3[];
168 void __init smp4d_boot_cpus(void)
171 current_set[0] = NULL;
172 smp_setup_percpu_timer();
173 local_flush_cache_all();
176 int __cpuinit smp4d_boot_one_cpu(int i)
178 extern unsigned long sun4d_cpu_startup;
179 unsigned long *entry = &sun4d_cpu_startup;
180 struct task_struct *p;
184 cpu_find_by_instance(i, &cpu_node,NULL);
185 /* Cook up an idler for this guy. */
187 current_set[i] = task_thread_info(p);
190 * Initialize the contexts table
191 * Since the call to prom_startcpu() trashes the structure,
192 * we need to re-initialize it for each cpu
194 smp_penguin_ctable.which_io = 0;
195 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
196 smp_penguin_ctable.reg_size = 0;
198 /* whirrr, whirrr, whirrrrrrrrr... */
199 SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
200 local_flush_cache_all();
201 prom_startcpu(cpu_node,
202 &smp_penguin_ctable, 0, (char *)entry);
204 SMP_PRINTK(("prom_startcpu returned :)\n"));
206 /* wheee... it's going... */
207 for(timeout = 0; timeout < 10000; timeout++) {
208 if(cpu_callin_map[i])
213 if (!(cpu_callin_map[i])) {
214 printk("Processor %d is stuck.\n", i);
218 local_flush_cache_all();
222 void __init smp4d_smp_done(void)
227 /* setup cpu list for irq rotation */
230 for (i = 0; i < NR_CPUS; i++)
233 prev = &cpu_data(i).next;
236 local_flush_cache_all();
238 /* Free unneeded trap tables */
239 ClearPageReserved(virt_to_page(trapbase_cpu1));
240 init_page_count(virt_to_page(trapbase_cpu1));
241 free_page((unsigned long)trapbase_cpu1);
245 ClearPageReserved(virt_to_page(trapbase_cpu2));
246 init_page_count(virt_to_page(trapbase_cpu2));
247 free_page((unsigned long)trapbase_cpu2);
251 ClearPageReserved(virt_to_page(trapbase_cpu3));
252 init_page_count(virt_to_page(trapbase_cpu3));
253 free_page((unsigned long)trapbase_cpu3);
257 /* Ok, they are spinning and ready to go. */
258 smp_processors_ready = 1;
259 sun4d_distribute_irqs();
262 static struct smp_funcall {
269 unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */
270 unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
271 } ccall_info __attribute__((aligned(8)));
273 static DEFINE_SPINLOCK(cross_call_lock);
275 /* Cross calls must be serialized, at least currently. */
276 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
277 unsigned long arg2, unsigned long arg3,
280 if(smp_processors_ready) {
281 register int high = smp_highest_cpu;
284 spin_lock_irqsave(&cross_call_lock, flags);
287 /* If you make changes here, make sure gcc generates proper code... */
288 register smpfunc_t f asm("i0") = func;
289 register unsigned long a1 asm("i1") = arg1;
290 register unsigned long a2 asm("i2") = arg2;
291 register unsigned long a3 asm("i3") = arg3;
292 register unsigned long a4 asm("i4") = arg4;
293 register unsigned long a5 asm("i5") = 0;
295 __asm__ __volatile__(
297 "std %2, [%6 + 8]\n\t"
298 "std %4, [%6 + 16]\n\t" : :
299 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
300 "r" (&ccall_info.func));
303 /* Init receive/complete mapping, plus fire the IPI's off. */
307 cpu_clear(smp_processor_id(), mask);
308 cpus_and(mask, cpu_online_map, mask);
309 for(i = 0; i <= high; i++) {
310 if (cpu_isset(i, mask)) {
311 ccall_info.processors_in[i] = 0;
312 ccall_info.processors_out[i] = 0;
313 sun4d_send_ipi(i, IRQ_CROSS_CALL);
323 if (!cpu_isset(i, mask))
325 while(!ccall_info.processors_in[i])
327 } while(++i <= high);
331 if (!cpu_isset(i, mask))
333 while(!ccall_info.processors_out[i])
335 } while(++i <= high);
338 spin_unlock_irqrestore(&cross_call_lock, flags);
342 /* Running cross calls. */
343 void smp4d_cross_call_irq(void)
345 int i = hard_smp4d_processor_id();
347 ccall_info.processors_in[i] = 1;
348 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
349 ccall_info.arg4, ccall_info.arg5);
350 ccall_info.processors_out[i] = 1;
353 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
355 struct pt_regs *old_regs;
356 int cpu = hard_smp4d_processor_id();
357 static int cpu_tick[NR_CPUS];
358 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
360 old_regs = set_irq_regs(regs);
361 bw_get_prof_limit(cpu);
362 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
365 if (!(cpu_tick[cpu] & 15)) {
366 if (cpu_tick[cpu] == 0x60)
368 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
372 profile_tick(CPU_PROFILING);
374 if(!--prof_counter(cpu)) {
375 int user = user_mode(regs);
378 update_process_times(user);
381 prof_counter(cpu) = prof_multiplier(cpu);
383 set_irq_regs(old_regs);
386 extern unsigned int lvl14_resolution;
388 static void __init smp_setup_percpu_timer(void)
390 int cpu = hard_smp4d_processor_id();
392 prof_counter(cpu) = prof_multiplier(cpu) = 1;
393 load_profile_irq(cpu, lvl14_resolution);
396 void __init smp4d_blackbox_id(unsigned *addr)
398 int rd = *addr & 0x3e000000;
400 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
401 addr[1] = 0x01000000; /* nop */
402 addr[2] = 0x01000000; /* nop */
405 void __init smp4d_blackbox_current(unsigned *addr)
407 int rd = *addr & 0x3e000000;
409 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
410 addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
411 addr[4] = 0x01000000; /* nop */
414 void __init sun4d_init_smp(void)
417 extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
419 /* Patch ipi15 trap table */
420 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
422 /* And set btfixup... */
423 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
424 BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
425 BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
426 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
428 for (i = 0; i < NR_CPUS; i++) {
429 ccall_info.processors_in[i] = 1;
430 ccall_info.processors_out[i] = 1;