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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_64_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#ifdef CONFIG_PPC_STD_MMU_64
86 struct slb_shadow *slb_shadow_ptr;
87
88 /*
89 * Now, starting in cacheline 2, the exception save areas
90 */
91 /* used for most interrupts/exceptions */
92 u64 exgen[10] __attribute__((aligned(0x80)));
93 u64 exmc[10]; /* used for machine checks */
94 u64 exslb[10]; /* used for SLB/segment table misses
95 * on the linear mapping */
96 /* SLB related definitions */
97 u16 vmalloc_sllp;
98 u16 slb_cache_ptr;
99 u16 slb_cache[SLB_CACHE_ENTRIES];
100#endif /* CONFIG_PPC_STD_MMU_64 */
101
102#ifdef CONFIG_PPC_BOOK3E
103 pgd_t *pgd; /* Current PGD */
104 pgd_t *kernel_pgd; /* Kernel PGD */
105 u64 exgen[8] __attribute__((aligned(0x80)));
106 u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
107 u64 exmc[8]; /* used for machine checks */
108 u64 excrit[8]; /* used for crit interrupts */
109 u64 exdbg[8]; /* used for debug interrupts */
110
111 /* Kernel stack pointers for use by special exceptions */
112 void *mc_kstack;
113 void *crit_kstack;
114 void *dbg_kstack;
115#endif /* CONFIG_PPC_BOOK3E */
116
117 mm_context_t context;
118
119 /*
120 * then miscellaneous read-write fields
121 */
122 struct task_struct *__current; /* Pointer to current */
123 u64 kstack; /* Saved Kernel stack addr */
124 u64 stab_rr; /* stab/slb round-robin counter */
125 u64 saved_r1; /* r1 save for RTAS calls */
126 u64 saved_msr; /* MSR saved here by enter_rtas */
127 u16 trap_save; /* Used when bad stack is encountered */
128 u8 soft_enabled; /* irq soft-enable flag */
129 u8 hard_enabled; /* set if irqs are enabled in MSR */
130 u8 io_sync; /* writel() needs spin_unlock sync */
131 u8 perf_event_pending; /* PM interrupt while soft-disabled */
132
133 /* Stuff for accurate time accounting */
134 u64 user_time; /* accumulated usermode TB ticks */
135 u64 system_time; /* accumulated system TB ticks */
136 u64 startpurr; /* PURR/TB value snapshot */
137 u64 startspurr; /* SPURR value snapshot */
138
139#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
140 struct {
141 u64 esid;
142 u64 vsid;
143 } kvm_slb[64]; /* guest SLB */
144 /* We use this to store guest state in */
145 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
146 u8 kvm_slb_max; /* highest used guest slb entry */
147 u8 kvm_in_guest; /* are we inside the guest? */
148#endif
149};
150
151extern struct paca_struct *paca;
152extern __initdata struct paca_struct boot_paca;
153extern void initialise_paca(struct paca_struct *new_paca, int cpu);
154
155extern void allocate_pacas(void);
156extern void free_unused_pacas(void);
157
158#else /* CONFIG_PPC64 */
159
160static inline void allocate_pacas(void) { };
161static inline void free_unused_pacas(void) { };
162
163#endif /* CONFIG_PPC64 */
164
165#endif /* __KERNEL__ */
166#endif /* _ASM_POWERPC_PACA_H */