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.
6 * C 2001 PPC 64 Team, IBM Corp
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.
13 #ifndef _ASM_POWERPC_PACA_H
14 #define _ASM_POWERPC_PACA_H
19 #include <asm/types.h>
20 #include <asm/lppaca.h>
23 #include <asm/exception-64e.h>
24 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
25 #include <asm/kvm_book3s_asm.h>
28 register struct paca_struct *local_paca asm("r13");
30 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
31 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
33 * Add standard checks that preemption cannot occur when using get_paca():
34 * otherwise the paca_struct it points to may be the wrong one just after.
36 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
38 #define get_paca() local_paca
41 #define get_lppaca() (get_paca()->lppaca_ptr)
42 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
45 struct opal_machine_check_event;
48 * Defines the layout of the paca.
50 * This structure is not directly accessed by firmware or the service
54 #ifdef CONFIG_PPC_BOOK3S
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.
62 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
63 #endif /* CONFIG_PPC_BOOK3S */
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
71 u16 lock_token; /* Constant 0x8000, used in locks */
72 u16 paca_index; /* Logical processor number */
74 u16 paca_index; /* Logical processor number */
75 u16 lock_token; /* Constant 0x8000, used in locks */
78 u64 kernel_toc; /* Kernel TOC address */
79 u64 kernelbase; /* Base address of kernel */
80 u64 kernel_msr; /* MSR while running in kernel */
81 #ifdef CONFIG_PPC_STD_MMU_64
82 u64 stab_real; /* Absolute address of segment table */
83 u64 stab_addr; /* Virtual address of segment table */
84 #endif /* CONFIG_PPC_STD_MMU_64 */
85 void *emergency_sp; /* pointer to emergency stack */
86 u64 data_offset; /* per cpu data offset */
87 s16 hw_cpu_id; /* Physical processor number */
88 u8 cpu_start; /* At startup, processor spins until */
89 /* this becomes non-zero. */
90 u8 kexec_state; /* set when kexec down has irqs off */
91 #ifdef CONFIG_PPC_STD_MMU_64
92 struct slb_shadow *slb_shadow_ptr;
93 struct dtl_entry *dispatch_log;
94 struct dtl_entry *dispatch_log_end;
97 * Now, starting in cacheline 2, the exception save areas
99 /* used for most interrupts/exceptions */
100 u64 exgen[13] __attribute__((aligned(0x80)));
101 u64 exmc[13]; /* used for machine checks */
102 u64 exslb[13]; /* used for SLB/segment table misses
103 * on the linear mapping */
104 /* SLB related definitions */
107 u32 slb_cache[SLB_CACHE_ENTRIES];
108 #endif /* CONFIG_PPC_STD_MMU_64 */
110 #ifdef CONFIG_PPC_BOOK3E
111 u64 exgen[8] __attribute__((aligned(0x80)));
112 /* Keep pgd in the same cacheline as the start of extlb */
113 pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
114 pgd_t *kernel_pgd; /* Kernel PGD */
115 /* We can have up to 3 levels of reentrancy in the TLB miss handler */
116 u64 extlb[3][EX_TLB_SIZE / sizeof(u64)];
117 u64 exmc[8]; /* used for machine checks */
118 u64 excrit[8]; /* used for crit interrupts */
119 u64 exdbg[8]; /* used for debug interrupts */
121 /* Kernel stack pointers for use by special exceptions */
125 #endif /* CONFIG_PPC_BOOK3E */
127 mm_context_t context;
130 * then miscellaneous read-write fields
132 struct task_struct *__current; /* Pointer to current */
133 u64 kstack; /* Saved Kernel stack addr */
134 u64 stab_rr; /* stab/slb round-robin counter */
135 u64 saved_r1; /* r1 save for RTAS calls or PM */
136 u64 saved_msr; /* MSR saved here by enter_rtas */
137 u16 trap_save; /* Used when bad stack is encountered */
138 u8 soft_enabled; /* irq soft-enable flag */
139 u8 irq_happened; /* irq happened while soft-disabled */
140 u8 io_sync; /* writel() needs spin_unlock sync */
141 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
142 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
143 u64 sprg3; /* Saved user-visible sprg */
144 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
145 u64 tm_scratch; /* TM scratch area for reclaim */
148 #ifdef CONFIG_PPC_POWERNV
149 /* Pointer to OPAL machine check event structure set by the
150 * early exception handler for use by high level C handler
152 struct opal_machine_check_event *opal_mc_evt;
154 #ifdef CONFIG_PPC_BOOK3S_64
155 /* Exclusive emergency stack pointer for machine check exception. */
156 void *mc_emergency_sp;
158 * Flag to check whether we are in machine check early handler
159 * and already using emergency stack.
164 /* Stuff for accurate time accounting */
165 u64 user_time; /* accumulated usermode TB ticks */
166 u64 system_time; /* accumulated system TB ticks */
167 u64 user_time_scaled; /* accumulated usermode SPURR ticks */
168 u64 starttime; /* TB value snapshot */
169 u64 starttime_user; /* TB value on exit to usermode */
170 u64 startspurr; /* SPURR value snapshot */
171 u64 utime_sspurr; /* ->user_time when ->startspurr set */
172 u64 stolen_time; /* TB ticks taken by hypervisor */
173 u64 dtl_ridx; /* read index in dispatch log */
174 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
176 #ifdef CONFIG_KVM_BOOK3S_HANDLER
177 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
178 /* We use this to store guest state in */
179 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
181 struct kvmppc_host_state kvm_hstate;
185 extern struct paca_struct *paca;
186 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
187 extern void setup_paca(struct paca_struct *new_paca);
188 extern void allocate_pacas(void);
189 extern void free_unused_pacas(void);
191 #else /* CONFIG_PPC64 */
193 static inline void allocate_pacas(void) { };
194 static inline void free_unused_pacas(void) { };
196 #endif /* CONFIG_PPC64 */
198 #endif /* __KERNEL__ */
199 #endif /* _ASM_POWERPC_PACA_H */