31139971b3
This allows cpus to be off-lined on 32-bit SMP powermacs. When a cpu is off-lined, it is put into sleep mode with interrupts disabled. It can be on-lined again by asserting its soft-reset pin, which is connected to a GPIO pin. With this I can off-line the second cpu in my dual G4 powermac, which means that I can then suspend the machine (the suspend/resume code refuses to suspend if more than one cpu is online, and making it cope with multiple cpus is surprisingly messy). Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* smp.h: PPC specific SMP stuff.
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*
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* Original was a copy of sparc smp.h. Now heavily modified
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* for PPC.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com>
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*/
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#ifdef __KERNEL__
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#ifndef _PPC_SMP_H
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#define _PPC_SMP_H
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/cpumask.h>
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#include <linux/threads.h>
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#ifdef CONFIG_SMP
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#ifndef __ASSEMBLY__
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struct cpuinfo_PPC {
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unsigned long loops_per_jiffy;
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unsigned long pvr;
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unsigned long *pgd_cache;
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unsigned long *pte_cache;
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unsigned long pgtable_cache_sz;
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};
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extern struct cpuinfo_PPC cpu_data[];
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_possible_map;
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extern unsigned long smp_proc_in_lock[];
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extern volatile unsigned long cpu_callin_map[];
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extern int smp_tb_synchronized;
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extern void smp_send_tlb_invalidate(int);
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extern void smp_send_xmon_break(int cpu);
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struct pt_regs;
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extern void smp_message_recv(int, struct pt_regs *);
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void cpu_die(void) __attribute__((noreturn));
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#define PROC_CHANGE_PENALTY 20
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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extern int __cpu_up(unsigned int cpu);
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extern int smp_hw_index[];
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#define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
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struct klock_info_struct {
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unsigned long kernel_flag;
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unsigned char akp;
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};
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extern struct klock_info_struct klock_info;
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#define KLOCK_HELD 0xffffffff
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#define KLOCK_CLEAR 0x0
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#endif /* __ASSEMBLY__ */
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#else /* !(CONFIG_SMP) */
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static inline void cpu_die(void) { }
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#endif /* !(CONFIG_SMP) */
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#endif /* !(_PPC_SMP_H) */
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#endif /* __KERNEL__ */
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