1 /* sun4m_smp.c: Sparc SUN4M SMP support.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
8 #include <linux/kernel.h>
9 #include <linux/sched.h>
10 #include <linux/threads.h>
11 #include <linux/smp.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel_stat.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
17 #include <linux/swap.h>
18 #include <linux/profile.h>
19 #include <linux/delay.h>
20 #include <linux/cpu.h>
22 #include <asm/cacheflush.h>
23 #include <asm/tlbflush.h>
24 #include <asm/irq_regs.h>
26 #include <asm/ptrace.h>
27 #include <asm/atomic.h>
31 #include <asm/pgalloc.h>
32 #include <asm/pgtable.h>
33 #include <asm/oplib.h>
34 #include <asm/cpudata.h>
38 #define IRQ_CROSS_CALL 15
40 extern ctxd_t
*srmmu_ctx_table_phys
;
42 extern volatile unsigned long cpu_callin_map
[NR_CPUS
];
43 extern unsigned char boot_cpu_id
;
45 extern cpumask_t smp_commenced_mask
;
47 extern int __smp4m_processor_id(void);
52 #define SMP_PRINTK(x) printk x
57 static inline unsigned long swap(volatile unsigned long *ptr
, unsigned long val
)
59 __asm__
__volatile__("swap [%1], %0\n\t" :
60 "=&r" (val
), "=&r" (ptr
) :
61 "0" (val
), "1" (ptr
));
65 static void smp_setup_percpu_timer(void);
66 extern void cpu_probe(void);
68 void __cpuinit
smp4m_callin(void)
70 int cpuid
= hard_smp_processor_id();
72 local_flush_cache_all();
73 local_flush_tlb_all();
75 notify_cpu_starting(cpuid
);
77 /* Get our local ticker going. */
78 smp_setup_percpu_timer();
81 smp_store_cpu_info(cpuid
);
83 local_flush_cache_all();
84 local_flush_tlb_all();
87 * Unblock the master CPU _only_ when the scheduler state
88 * of all secondary CPUs will be up-to-date, so after
89 * the SMP initialization the master will be just allowed
90 * to call the scheduler code.
92 /* Allow master to continue. */
93 swap(&cpu_callin_map
[cpuid
], 1);
95 /* XXX: What's up with all the flushes? */
96 local_flush_cache_all();
97 local_flush_tlb_all();
101 /* Fix idle thread fields. */
102 __asm__
__volatile__("ld [%0], %%g6\n\t"
103 : : "r" (¤t_set
[cpuid
])
104 : "memory" /* paranoid */);
106 /* Attach to the address space of init_task. */
107 atomic_inc(&init_mm
.mm_count
);
108 current
->active_mm
= &init_mm
;
110 while (!cpu_isset(cpuid
, smp_commenced_mask
))
115 cpu_set(cpuid
, cpu_online_map
);
119 * Cycle through the processors asking the PROM to start each one.
122 extern struct linux_prom_registers smp_penguin_ctable
;
123 extern unsigned long trapbase_cpu1
[];
124 extern unsigned long trapbase_cpu2
[];
125 extern unsigned long trapbase_cpu3
[];
127 void __init
smp4m_boot_cpus(void)
129 smp_setup_percpu_timer();
130 local_flush_cache_all();
133 int __cpuinit
smp4m_boot_one_cpu(int i
)
135 extern unsigned long sun4m_cpu_startup
;
136 unsigned long *entry
= &sun4m_cpu_startup
;
137 struct task_struct
*p
;
141 cpu_find_by_mid(i
, &cpu_node
);
143 /* Cook up an idler for this guy. */
145 current_set
[i
] = task_thread_info(p
);
146 /* See trampoline.S for details... */
147 entry
+= ((i
-1) * 3);
150 * Initialize the contexts table
151 * Since the call to prom_startcpu() trashes the structure,
152 * we need to re-initialize it for each cpu
154 smp_penguin_ctable
.which_io
= 0;
155 smp_penguin_ctable
.phys_addr
= (unsigned int) srmmu_ctx_table_phys
;
156 smp_penguin_ctable
.reg_size
= 0;
158 /* whirrr, whirrr, whirrrrrrrrr... */
159 printk("Starting CPU %d at %p\n", i
, entry
);
160 local_flush_cache_all();
161 prom_startcpu(cpu_node
,
162 &smp_penguin_ctable
, 0, (char *)entry
);
164 /* wheee... it's going... */
165 for(timeout
= 0; timeout
< 10000; timeout
++) {
166 if(cpu_callin_map
[i
])
171 if (!(cpu_callin_map
[i
])) {
172 printk("Processor %d is stuck.\n", i
);
176 local_flush_cache_all();
180 void __init
smp4m_smp_done(void)
185 /* setup cpu list for irq rotation */
188 for (i
= 0; i
< NR_CPUS
; i
++) {
191 prev
= &cpu_data(i
).next
;
195 local_flush_cache_all();
197 /* Free unneeded trap tables */
198 if (!cpu_isset(1, cpu_present_map
)) {
199 ClearPageReserved(virt_to_page(trapbase_cpu1
));
200 init_page_count(virt_to_page(trapbase_cpu1
));
201 free_page((unsigned long)trapbase_cpu1
);
205 if (!cpu_isset(2, cpu_present_map
)) {
206 ClearPageReserved(virt_to_page(trapbase_cpu2
));
207 init_page_count(virt_to_page(trapbase_cpu2
));
208 free_page((unsigned long)trapbase_cpu2
);
212 if (!cpu_isset(3, cpu_present_map
)) {
213 ClearPageReserved(virt_to_page(trapbase_cpu3
));
214 init_page_count(virt_to_page(trapbase_cpu3
));
215 free_page((unsigned long)trapbase_cpu3
);
220 /* Ok, they are spinning and ready to go. */
223 /* At each hardware IRQ, we get this called to forward IRQ reception
224 * to the next processor. The caller must disable the IRQ level being
225 * serviced globally so that there are no double interrupts received.
227 * XXX See sparc64 irq.c.
229 void smp4m_irq_rotate(int cpu
)
231 int next
= cpu_data(cpu
).next
;
236 static struct smp_funcall
{
243 unsigned long processors_in
[SUN4M_NCPUS
]; /* Set when ipi entered. */
244 unsigned long processors_out
[SUN4M_NCPUS
]; /* Set when ipi exited. */
247 static DEFINE_SPINLOCK(cross_call_lock
);
249 /* Cross calls must be serialized, at least currently. */
250 static void smp4m_cross_call(smpfunc_t func
, cpumask_t mask
, unsigned long arg1
,
251 unsigned long arg2
, unsigned long arg3
,
254 register int ncpus
= SUN4M_NCPUS
;
257 spin_lock_irqsave(&cross_call_lock
, flags
);
259 /* Init function glue. */
260 ccall_info
.func
= func
;
261 ccall_info
.arg1
= arg1
;
262 ccall_info
.arg2
= arg2
;
263 ccall_info
.arg3
= arg3
;
264 ccall_info
.arg4
= arg4
;
267 /* Init receive/complete mapping, plus fire the IPI's off. */
271 cpu_clear(smp_processor_id(), mask
);
272 cpus_and(mask
, cpu_online_map
, mask
);
273 for(i
= 0; i
< ncpus
; i
++) {
274 if (cpu_isset(i
, mask
)) {
275 ccall_info
.processors_in
[i
] = 0;
276 ccall_info
.processors_out
[i
] = 0;
277 set_cpu_int(i
, IRQ_CROSS_CALL
);
279 ccall_info
.processors_in
[i
] = 1;
280 ccall_info
.processors_out
[i
] = 1;
290 if (!cpu_isset(i
, mask
))
292 while(!ccall_info
.processors_in
[i
])
294 } while(++i
< ncpus
);
298 if (!cpu_isset(i
, mask
))
300 while(!ccall_info
.processors_out
[i
])
302 } while(++i
< ncpus
);
305 spin_unlock_irqrestore(&cross_call_lock
, flags
);
308 /* Running cross calls. */
309 void smp4m_cross_call_irq(void)
311 int i
= smp_processor_id();
313 ccall_info
.processors_in
[i
] = 1;
314 ccall_info
.func(ccall_info
.arg1
, ccall_info
.arg2
, ccall_info
.arg3
,
315 ccall_info
.arg4
, ccall_info
.arg5
);
316 ccall_info
.processors_out
[i
] = 1;
319 extern void sun4m_clear_profile_irq(int cpu
);
321 void smp4m_percpu_timer_interrupt(struct pt_regs
*regs
)
323 struct pt_regs
*old_regs
;
324 int cpu
= smp_processor_id();
326 old_regs
= set_irq_regs(regs
);
328 sun4m_clear_profile_irq(cpu
);
330 profile_tick(CPU_PROFILING
);
332 if(!--prof_counter(cpu
)) {
333 int user
= user_mode(regs
);
336 update_process_times(user
);
339 prof_counter(cpu
) = prof_multiplier(cpu
);
341 set_irq_regs(old_regs
);
344 extern unsigned int lvl14_resolution
;
346 static void __cpuinit
smp_setup_percpu_timer(void)
348 int cpu
= smp_processor_id();
350 prof_counter(cpu
) = prof_multiplier(cpu
) = 1;
351 load_profile_irq(cpu
, lvl14_resolution
);
353 if(cpu
== boot_cpu_id
)
357 static void __init
smp4m_blackbox_id(unsigned *addr
)
359 int rd
= *addr
& 0x3e000000;
362 addr
[0] = 0x81580000 | rd
; /* rd %tbr, reg */
363 addr
[1] = 0x8130200c | rd
| rs1
; /* srl reg, 0xc, reg */
364 addr
[2] = 0x80082003 | rd
| rs1
; /* and reg, 3, reg */
367 static void __init
smp4m_blackbox_current(unsigned *addr
)
369 int rd
= *addr
& 0x3e000000;
372 addr
[0] = 0x81580000 | rd
; /* rd %tbr, reg */
373 addr
[2] = 0x8130200a | rd
| rs1
; /* srl reg, 0xa, reg */
374 addr
[4] = 0x8008200c | rd
| rs1
; /* and reg, 0xc, reg */
377 void __init
sun4m_init_smp(void)
379 BTFIXUPSET_BLACKBOX(hard_smp_processor_id
, smp4m_blackbox_id
);
380 BTFIXUPSET_BLACKBOX(load_current
, smp4m_blackbox_current
);
381 BTFIXUPSET_CALL(smp_cross_call
, smp4m_cross_call
, BTFIXUPCALL_NORM
);
382 BTFIXUPSET_CALL(__hard_smp_processor_id
, __smp4m_processor_id
, BTFIXUPCALL_NORM
);