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
29 register struct paca_struct *local_paca asm("r13");
30
31 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
32 extern 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
45 struct 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 */
53 struct 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 struct dtl_entry *dispatch_log;
89 struct dtl_entry *dispatch_log_end;
90
91 /*
92 * Now, starting in cacheline 2, the exception save areas
93 */
94 /* used for most interrupts/exceptions */
95 u64 exgen[10] __attribute__((aligned(0x80)));
96 u64 exmc[10]; /* used for machine checks */
97 u64 exslb[10]; /* used for SLB/segment table misses
98 * on the linear mapping */
99 /* SLB related definitions */
100 u16 vmalloc_sllp;
101 u16 slb_cache_ptr;
102 u16 slb_cache[SLB_CACHE_ENTRIES];
103 #endif /* CONFIG_PPC_STD_MMU_64 */
104
105 #ifdef CONFIG_PPC_BOOK3E
106 pgd_t *pgd; /* Current PGD */
107 pgd_t *kernel_pgd; /* Kernel PGD */
108 u64 exgen[8] __attribute__((aligned(0x80)));
109 u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
110 u64 exmc[8]; /* used for machine checks */
111 u64 excrit[8]; /* used for crit interrupts */
112 u64 exdbg[8]; /* used for debug interrupts */
113
114 /* Kernel stack pointers for use by special exceptions */
115 void *mc_kstack;
116 void *crit_kstack;
117 void *dbg_kstack;
118 #endif /* CONFIG_PPC_BOOK3E */
119
120 mm_context_t context;
121
122 /*
123 * then miscellaneous read-write fields
124 */
125 struct task_struct *__current; /* Pointer to current */
126 u64 kstack; /* Saved Kernel stack addr */
127 u64 stab_rr; /* stab/slb round-robin counter */
128 u64 saved_r1; /* r1 save for RTAS calls */
129 u64 saved_msr; /* MSR saved here by enter_rtas */
130 u16 trap_save; /* Used when bad stack is encountered */
131 u8 soft_enabled; /* irq soft-enable flag */
132 u8 hard_enabled; /* set if irqs are enabled in MSR */
133 u8 io_sync; /* writel() needs spin_unlock sync */
134 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
135
136 /* Stuff for accurate time accounting */
137 u64 user_time; /* accumulated usermode TB ticks */
138 u64 system_time; /* accumulated system TB ticks */
139 u64 user_time_scaled; /* accumulated usermode SPURR ticks */
140 u64 starttime; /* TB value snapshot */
141 u64 starttime_user; /* TB value on exit to usermode */
142 u64 startspurr; /* SPURR value snapshot */
143 u64 utime_sspurr; /* ->user_time when ->startspurr set */
144 u64 stolen_time; /* TB ticks taken by hypervisor */
145 u64 dtl_ridx; /* read index in dispatch log */
146 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
147
148 #ifdef CONFIG_KVM_BOOK3S_HANDLER
149 /* We use this to store guest state in */
150 struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
151 #endif
152 };
153
154 extern struct paca_struct *paca;
155 extern __initdata struct paca_struct boot_paca;
156 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
157 extern void setup_paca(struct paca_struct *new_paca);
158 extern void allocate_pacas(void);
159 extern void free_unused_pacas(void);
160
161 #else /* CONFIG_PPC64 */
162
allocate_pacas(void)163 static inline void allocate_pacas(void) { };
free_unused_pacas(void)164 static inline void free_unused_pacas(void) { };
165
166 #endif /* CONFIG_PPC64 */
167
168 #endif /* __KERNEL__ */
169 #endif /* _ASM_POWERPC_PACA_H */
170