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
58 swap_ulong(volatile unsigned long *ptr
, unsigned long val
)
60 __asm__
__volatile__("swap [%1], %0\n\t" :
61 "=&r" (val
), "=&r" (ptr
) :
62 "0" (val
), "1" (ptr
));
66 static void smp_setup_percpu_timer(void);
67 extern void cpu_probe(void);
69 void __cpuinit
smp4m_callin(void)
71 int cpuid
= hard_smp_processor_id();
73 local_flush_cache_all();
74 local_flush_tlb_all();
76 notify_cpu_starting(cpuid
);
78 /* Get our local ticker going. */
79 smp_setup_percpu_timer();
82 smp_store_cpu_info(cpuid
);
84 local_flush_cache_all();
85 local_flush_tlb_all();
88 * Unblock the master CPU _only_ when the scheduler state
89 * of all secondary CPUs will be up-to-date, so after
90 * the SMP initialization the master will be just allowed
91 * to call the scheduler code.
93 /* Allow master to continue. */
94 swap_ulong(&cpu_callin_map
[cpuid
], 1);
96 /* XXX: What's up with all the flushes? */
97 local_flush_cache_all();
98 local_flush_tlb_all();
102 /* Fix idle thread fields. */
103 __asm__
__volatile__("ld [%0], %%g6\n\t"
104 : : "r" (¤t_set
[cpuid
])
105 : "memory" /* paranoid */);
107 /* Attach to the address space of init_task. */
108 atomic_inc(&init_mm
.mm_count
);
109 current
->active_mm
= &init_mm
;
111 while (!cpu_isset(cpuid
, smp_commenced_mask
))
116 set_cpu_online(cpuid
, true);
120 * Cycle through the processors asking the PROM to start each one.
123 extern struct linux_prom_registers smp_penguin_ctable
;
124 extern unsigned long trapbase_cpu1
[];
125 extern unsigned long trapbase_cpu2
[];
126 extern unsigned long trapbase_cpu3
[];
128 void __init
smp4m_boot_cpus(void)
130 smp_setup_percpu_timer();
131 local_flush_cache_all();
134 int __cpuinit
smp4m_boot_one_cpu(int i
)
136 extern unsigned long sun4m_cpu_startup
;
137 unsigned long *entry
= &sun4m_cpu_startup
;
138 struct task_struct
*p
;
142 cpu_find_by_mid(i
, &cpu_node
);
144 /* Cook up an idler for this guy. */
146 current_set
[i
] = task_thread_info(p
);
147 /* See trampoline.S for details... */
148 entry
+= ((i
-1) * 3);
151 * Initialize the contexts table
152 * Since the call to prom_startcpu() trashes the structure,
153 * we need to re-initialize it for each cpu
155 smp_penguin_ctable
.which_io
= 0;
156 smp_penguin_ctable
.phys_addr
= (unsigned int) srmmu_ctx_table_phys
;
157 smp_penguin_ctable
.reg_size
= 0;
159 /* whirrr, whirrr, whirrrrrrrrr... */
160 printk("Starting CPU %d at %p\n", i
, entry
);
161 local_flush_cache_all();
162 prom_startcpu(cpu_node
,
163 &smp_penguin_ctable
, 0, (char *)entry
);
165 /* wheee... it's going... */
166 for(timeout
= 0; timeout
< 10000; timeout
++) {
167 if(cpu_callin_map
[i
])
172 if (!(cpu_callin_map
[i
])) {
173 printk("Processor %d is stuck.\n", i
);
177 local_flush_cache_all();
181 void __init
smp4m_smp_done(void)
186 /* setup cpu list for irq rotation */
189 for_each_online_cpu(i
) {
191 prev
= &cpu_data(i
).next
;
194 local_flush_cache_all();
196 /* Free unneeded trap tables */
197 if (!cpu_isset(1, cpu_present_map
)) {
198 ClearPageReserved(virt_to_page(trapbase_cpu1
));
199 init_page_count(virt_to_page(trapbase_cpu1
));
200 free_page((unsigned long)trapbase_cpu1
);
204 if (!cpu_isset(2, cpu_present_map
)) {
205 ClearPageReserved(virt_to_page(trapbase_cpu2
));
206 init_page_count(virt_to_page(trapbase_cpu2
));
207 free_page((unsigned long)trapbase_cpu2
);
211 if (!cpu_isset(3, cpu_present_map
)) {
212 ClearPageReserved(virt_to_page(trapbase_cpu3
));
213 init_page_count(virt_to_page(trapbase_cpu3
));
214 free_page((unsigned long)trapbase_cpu3
);
219 /* Ok, they are spinning and ready to go. */
222 /* At each hardware IRQ, we get this called to forward IRQ reception
223 * to the next processor. The caller must disable the IRQ level being
224 * serviced globally so that there are no double interrupts received.
226 * XXX See sparc64 irq.c.
228 void smp4m_irq_rotate(int cpu
)
230 int next
= cpu_data(cpu
).next
;
235 static struct smp_funcall
{
242 unsigned long processors_in
[SUN4M_NCPUS
]; /* Set when ipi entered. */
243 unsigned long processors_out
[SUN4M_NCPUS
]; /* Set when ipi exited. */
246 static DEFINE_SPINLOCK(cross_call_lock
);
248 /* Cross calls must be serialized, at least currently. */
249 static void smp4m_cross_call(smpfunc_t func
, cpumask_t mask
, unsigned long arg1
,
250 unsigned long arg2
, unsigned long arg3
,
253 register int ncpus
= SUN4M_NCPUS
;
256 spin_lock_irqsave(&cross_call_lock
, flags
);
258 /* Init function glue. */
259 ccall_info
.func
= func
;
260 ccall_info
.arg1
= arg1
;
261 ccall_info
.arg2
= arg2
;
262 ccall_info
.arg3
= arg3
;
263 ccall_info
.arg4
= arg4
;
266 /* Init receive/complete mapping, plus fire the IPI's off. */
270 cpu_clear(smp_processor_id(), mask
);
271 cpus_and(mask
, cpu_online_map
, mask
);
272 for(i
= 0; i
< ncpus
; i
++) {
273 if (cpu_isset(i
, mask
)) {
274 ccall_info
.processors_in
[i
] = 0;
275 ccall_info
.processors_out
[i
] = 0;
276 set_cpu_int(i
, IRQ_CROSS_CALL
);
278 ccall_info
.processors_in
[i
] = 1;
279 ccall_info
.processors_out
[i
] = 1;
289 if (!cpu_isset(i
, mask
))
291 while(!ccall_info
.processors_in
[i
])
293 } while(++i
< ncpus
);
297 if (!cpu_isset(i
, mask
))
299 while(!ccall_info
.processors_out
[i
])
301 } while(++i
< ncpus
);
304 spin_unlock_irqrestore(&cross_call_lock
, flags
);
307 /* Running cross calls. */
308 void smp4m_cross_call_irq(void)
310 int i
= smp_processor_id();
312 ccall_info
.processors_in
[i
] = 1;
313 ccall_info
.func(ccall_info
.arg1
, ccall_info
.arg2
, ccall_info
.arg3
,
314 ccall_info
.arg4
, ccall_info
.arg5
);
315 ccall_info
.processors_out
[i
] = 1;
318 extern void sun4m_clear_profile_irq(int cpu
);
320 void smp4m_percpu_timer_interrupt(struct pt_regs
*regs
)
322 struct pt_regs
*old_regs
;
323 int cpu
= smp_processor_id();
325 old_regs
= set_irq_regs(regs
);
327 sun4m_clear_profile_irq(cpu
);
329 profile_tick(CPU_PROFILING
);
331 if(!--prof_counter(cpu
)) {
332 int user
= user_mode(regs
);
335 update_process_times(user
);
338 prof_counter(cpu
) = prof_multiplier(cpu
);
340 set_irq_regs(old_regs
);
343 extern unsigned int lvl14_resolution
;
345 static void __cpuinit
smp_setup_percpu_timer(void)
347 int cpu
= smp_processor_id();
349 prof_counter(cpu
) = prof_multiplier(cpu
) = 1;
350 load_profile_irq(cpu
, lvl14_resolution
);
352 if(cpu
== boot_cpu_id
)
356 static void __init
smp4m_blackbox_id(unsigned *addr
)
358 int rd
= *addr
& 0x3e000000;
361 addr
[0] = 0x81580000 | rd
; /* rd %tbr, reg */
362 addr
[1] = 0x8130200c | rd
| rs1
; /* srl reg, 0xc, reg */
363 addr
[2] = 0x80082003 | rd
| rs1
; /* and reg, 3, reg */
366 static void __init
smp4m_blackbox_current(unsigned *addr
)
368 int rd
= *addr
& 0x3e000000;
371 addr
[0] = 0x81580000 | rd
; /* rd %tbr, reg */
372 addr
[2] = 0x8130200a | rd
| rs1
; /* srl reg, 0xa, reg */
373 addr
[4] = 0x8008200c | rd
| rs1
; /* and reg, 0xc, reg */
376 void __init
sun4m_init_smp(void)
378 BTFIXUPSET_BLACKBOX(hard_smp_processor_id
, smp4m_blackbox_id
);
379 BTFIXUPSET_BLACKBOX(load_current
, smp4m_blackbox_current
);
380 BTFIXUPSET_CALL(smp_cross_call
, smp4m_cross_call
, BTFIXUPCALL_NORM
);
381 BTFIXUPSET_CALL(__hard_smp_processor_id
, __smp4m_processor_id
, BTFIXUPCALL_NORM
);