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 <linux/string.h>
20 #include <asm/types.h>
21 #include <asm/lppaca.h>
24 #include <asm/exception-64e.h>
25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
26 #include <asm/kvm_book3s_asm.h>
28 #include <asm/accounting.h>
30 register struct paca_struct *local_paca asm("r13");
32 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
33 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
35 * Add standard checks that preemption cannot occur when using get_paca():
36 * otherwise the paca_struct it points to may be the wrong one just after.
38 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
40 #define get_paca() local_paca
43 #define get_lppaca() (get_paca()->lppaca_ptr)
44 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
49 * Defines the layout of the paca.
51 * This structure is not directly accessed by firmware or the service
55 #ifdef CONFIG_PPC_BOOK3S
57 * Because hw_cpu_id, unlike other paca fields, is accessed
58 * routinely from other CPUs (from the IRQ code), we stick to
59 * read-only (after boot) fields in the first cacheline to
60 * avoid cacheline bouncing.
63 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
64 #endif /* CONFIG_PPC_BOOK3S */
66 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
67 * load lock_token and paca_index with a single lwz
68 * instruction. They must travel together and be properly
72 u16 lock_token; /* Constant 0x8000, used in locks */
73 u16 paca_index; /* Logical processor number */
75 u16 paca_index; /* Logical processor number */
76 u16 lock_token; /* Constant 0x8000, used in locks */
79 u64 kernel_toc; /* Kernel TOC address */
80 u64 kernelbase; /* Base address of kernel */
81 u64 kernel_msr; /* MSR while running in kernel */
82 void *emergency_sp; /* pointer to emergency stack */
83 u64 data_offset; /* per cpu data offset */
84 s16 hw_cpu_id; /* Physical processor number */
85 u8 cpu_start; /* At startup, processor spins until */
86 /* this becomes non-zero. */
87 u8 kexec_state; /* set when kexec down has irqs off */
88 #ifdef CONFIG_PPC_STD_MMU_64
89 struct slb_shadow *slb_shadow_ptr;
90 struct dtl_entry *dispatch_log;
91 struct dtl_entry *dispatch_log_end;
92 #endif /* CONFIG_PPC_STD_MMU_64 */
93 u64 dscr_default; /* per-CPU default DSCR */
95 #ifdef CONFIG_PPC_STD_MMU_64
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] __aligned(0x40);
112 /* Keep pgd in the same cacheline as the start of extlb */
113 pgd_t *pgd __aligned(0x40); /* Current PGD */
114 pgd_t *kernel_pgd; /* Kernel PGD */
116 /* Shared by all threads of a core -- points to tcd of first thread */
117 struct tlb_core_data *tcd_ptr;
120 * We can have up to 3 levels of reentrancy in the TLB miss handler,
121 * in each of four exception levels (normal, crit, mcheck, debug).
123 u64 extlb[12][EX_TLB_SIZE / sizeof(u64)];
124 u64 exmc[8]; /* used for machine checks */
125 u64 excrit[8]; /* used for crit interrupts */
126 u64 exdbg[8]; /* used for debug interrupts */
128 /* Kernel stack pointers for use by special exceptions */
133 struct tlb_core_data tcd;
134 #endif /* CONFIG_PPC_BOOK3E */
136 #ifdef CONFIG_PPC_BOOK3S
137 mm_context_id_t mm_ctx_id;
138 #ifdef CONFIG_PPC_MM_SLICES
139 u64 mm_ctx_low_slices_psize;
140 unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
142 u16 mm_ctx_user_psize;
148 * then miscellaneous read-write fields
150 struct task_struct *__current; /* Pointer to current */
151 u64 kstack; /* Saved Kernel stack addr */
152 u64 stab_rr; /* stab/slb round-robin counter */
153 u64 saved_r1; /* r1 save for RTAS calls or PM */
154 u64 saved_msr; /* MSR saved here by enter_rtas */
155 u16 trap_save; /* Used when bad stack is encountered */
156 u8 soft_enabled; /* irq soft-enable flag */
157 u8 irq_happened; /* irq happened while soft-disabled */
158 u8 io_sync; /* writel() needs spin_unlock sync */
159 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
160 u8 nap_state_lost; /* NV GPR values lost in power7_idle */
161 u64 sprg_vdso; /* Saved user-visible sprg */
162 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
163 u64 tm_scratch; /* TM scratch area for reclaim */
166 #ifdef CONFIG_PPC_POWERNV
167 /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
168 u32 *core_idle_state_ptr;
169 u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
170 /* Mask to indicate thread id in core */
172 /* Mask to denote subcore sibling threads */
173 u8 subcore_sibling_mask;
176 #ifdef CONFIG_PPC_BOOK3S_64
177 /* Exclusive emergency stack pointer for machine check exception. */
178 void *mc_emergency_sp;
180 * Flag to check whether we are in machine check early handler
181 * and already using emergency stack.
184 u8 hmi_event_available; /* HMI event is available */
187 /* Stuff for accurate time accounting */
188 struct cpu_accounting_data accounting;
189 u64 stolen_time; /* TB ticks taken by hypervisor */
190 u64 dtl_ridx; /* read index in dispatch log */
191 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
193 #ifdef CONFIG_KVM_BOOK3S_HANDLER
194 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
195 /* We use this to store guest state in */
196 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
198 struct kvmppc_host_state kvm_hstate;
202 #ifdef CONFIG_PPC_BOOK3S
203 static inline void copy_mm_to_paca(mm_context_t *context)
205 get_paca()->mm_ctx_id = context->id;
206 #ifdef CONFIG_PPC_MM_SLICES
207 get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
208 memcpy(&get_paca()->mm_ctx_high_slices_psize,
209 &context->high_slices_psize, SLICE_ARRAY_SIZE);
211 get_paca()->mm_ctx_user_psize = context->user_psize;
212 get_paca()->mm_ctx_sllp = context->sllp;
216 static inline void copy_mm_to_paca(mm_context_t *context){}
219 extern struct paca_struct *paca;
220 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
221 extern void setup_paca(struct paca_struct *new_paca);
222 extern void allocate_pacas(void);
223 extern void free_unused_pacas(void);
225 #else /* CONFIG_PPC64 */
227 static inline void allocate_pacas(void) { };
228 static inline void free_unused_pacas(void) { };
230 #endif /* CONFIG_PPC64 */
232 #endif /* __KERNEL__ */
233 #endif /* _ASM_POWERPC_PACA_H */