/arch/powerpc/include/asm/paca.h

  1/*
  2 * This control block defines the PACA which defines the processor
  3 * specific data for each logical processor on the system.
  4 * There are some pointers defined that are utilized by PLIC.
  5 *
  6 * C 2001 PPC 64 Team, IBM Corp
  7 *
  8 * This program is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU General Public License
 10 * as published by the Free Software Foundation; either version
 11 * 2 of the License, or (at your option) any later version.
 12 */
 13#ifndef _ASM_POWERPC_PACA_H
 14#define _ASM_POWERPC_PACA_H
 15#ifdef __KERNEL__
 16
 17#ifdef CONFIG_PPC64
 18
 19#include <linux/init.h>
 20#include <asm/types.h>
 21#include <asm/lppaca.h>
 22#include <asm/mmu.h>
 23#include <asm/page.h>
 24#include <asm/exception-64e.h>
 25#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 26#include <asm/kvm_book3s_asm.h>
 27#endif
 28
 29register struct paca_struct *local_paca asm("r13");
 30
 31#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
 32extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
 33/*
 34 * Add standard checks that preemption cannot occur when using get_paca():
 35 * otherwise the paca_struct it points to may be the wrong one just after.
 36 */
 37#define get_paca()	((void) debug_smp_processor_id(), local_paca)
 38#else
 39#define get_paca()	local_paca
 40#endif
 41
 42#define get_lppaca()	(get_paca()->lppaca_ptr)
 43#define get_slb_shadow()	(get_paca()->slb_shadow_ptr)
 44
 45struct task_struct;
 46
 47/*
 48 * Defines the layout of the paca.
 49 *
 50 * This structure is not directly accessed by firmware or the service
 51 * processor.
 52 */
 53struct paca_struct {
 54#ifdef CONFIG_PPC_BOOK3S
 55	/*
 56	 * Because hw_cpu_id, unlike other paca fields, is accessed
 57	 * routinely from other CPUs (from the IRQ code), we stick to
 58	 * read-only (after boot) fields in the first cacheline to
 59	 * avoid cacheline bouncing.
 60	 */
 61
 62	struct lppaca *lppaca_ptr;	/* Pointer to LpPaca for PLIC */
 63#endif /* CONFIG_PPC_BOOK3S */
 64	/*
 65	 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 
 66	 * load lock_token and paca_index with a single lwz
 67	 * instruction.  They must travel together and be properly
 68	 * aligned.
 69	 */
 70	u16 lock_token;			/* Constant 0x8000, used in locks */
 71	u16 paca_index;			/* Logical processor number */
 72
 73	u64 kernel_toc;			/* Kernel TOC address */
 74	u64 kernelbase;			/* Base address of kernel */
 75	u64 kernel_msr;			/* MSR while running in kernel */
 76#ifdef CONFIG_PPC_STD_MMU_64
 77	u64 stab_real;			/* Absolute address of segment table */
 78	u64 stab_addr;			/* Virtual address of segment table */
 79#endif /* CONFIG_PPC_STD_MMU_64 */
 80	void *emergency_sp;		/* pointer to emergency stack */
 81	u64 data_offset;		/* per cpu data offset */
 82	s16 hw_cpu_id;			/* Physical processor number */
 83	u8 cpu_start;			/* At startup, processor spins until */
 84					/* this becomes non-zero. */
 85	u8 kexec_state;		/* set when kexec down has irqs off */
 86#ifdef CONFIG_PPC_STD_MMU_64
 87	struct slb_shadow *slb_shadow_ptr;
 88
 89	/*
 90	 * Now, starting in cacheline 2, the exception save areas
 91	 */
 92	/* used for most interrupts/exceptions */
 93	u64 exgen[10] __attribute__((aligned(0x80)));
 94	u64 exmc[10];		/* used for machine checks */
 95	u64 exslb[10];		/* used for SLB/segment table misses
 96 				 * on the linear mapping */
 97	/* SLB related definitions */
 98	u16 vmalloc_sllp;
 99	u16 slb_cache_ptr;
100	u16 slb_cache[SLB_CACHE_ENTRIES];
101#endif /* CONFIG_PPC_STD_MMU_64 */
102
103#ifdef CONFIG_PPC_BOOK3E
104	pgd_t *pgd;			/* Current PGD */
105	pgd_t *kernel_pgd;		/* Kernel PGD */
106	u64 exgen[8] __attribute__((aligned(0x80)));
107	u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
108	u64 exmc[8];		/* used for machine checks */
109	u64 excrit[8];		/* used for crit interrupts */
110	u64 exdbg[8];		/* used for debug interrupts */
111
112	/* Kernel stack pointers for use by special exceptions */
113	void *mc_kstack;
114	void *crit_kstack;
115	void *dbg_kstack;
116#endif /* CONFIG_PPC_BOOK3E */
117
118	mm_context_t context;
119
120	/*
121	 * then miscellaneous read-write fields
122	 */
123	struct task_struct *__current;	/* Pointer to current */
124	u64 kstack;			/* Saved Kernel stack addr */
125	u64 stab_rr;			/* stab/slb round-robin counter */
126	u64 saved_r1;			/* r1 save for RTAS calls */
127	u64 saved_msr;			/* MSR saved here by enter_rtas */
128	u16 trap_save;			/* Used when bad stack is encountered */
129	u8 soft_enabled;		/* irq soft-enable flag */
130	u8 hard_enabled;		/* set if irqs are enabled in MSR */
131	u8 io_sync;			/* writel() needs spin_unlock sync */
132	u8 perf_event_pending;		/* PM interrupt while soft-disabled */
133
134	/* Stuff for accurate time accounting */
135	u64 user_time;			/* accumulated usermode TB ticks */
136	u64 system_time;		/* accumulated system TB ticks */
137	u64 startpurr;			/* PURR/TB value snapshot */
138	u64 startspurr;			/* SPURR value snapshot */
139
140#ifdef CONFIG_KVM_BOOK3S_HANDLER
141	/* We use this to store guest state in */
142	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
143#endif
144};
145
146extern struct paca_struct *paca;
147extern __initdata struct paca_struct boot_paca;
148extern void initialise_paca(struct paca_struct *new_paca, int cpu);
149
150extern void allocate_pacas(void);
151extern void free_unused_pacas(void);
152
153#else /* CONFIG_PPC64 */
154
155static inline void allocate_pacas(void) { };
156static inline void free_unused_pacas(void) { };
157
158#endif /* CONFIG_PPC64 */
159
160#endif /* __KERNEL__ */
161#endif /* _ASM_POWERPC_PACA_H */