Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
8882a4da | 2 | * include/asm-powerpc/paca.h |
1da177e4 | 3 | * |
8882a4da DG |
4 | * This control block defines the PACA which defines the processor |
5 | * specific data for each logical processor on the system. | |
1da177e4 LT |
6 | * There are some pointers defined that are utilized by PLIC. |
7 | * | |
8 | * C 2001 PPC 64 Team, IBM Corp | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
8882a4da DG |
14 | */ |
15 | #ifndef _ASM_POWERPC_PACA_H | |
16 | #define _ASM_POWERPC_PACA_H | |
88ced031 | 17 | #ifdef __KERNEL__ |
1da177e4 | 18 | |
1da177e4 LT |
19 | #include <asm/types.h> |
20 | #include <asm/lppaca.h> | |
1da177e4 LT |
21 | #include <asm/mmu.h> |
22 | ||
23 | register struct paca_struct *local_paca asm("r13"); | |
048c8bc9 HD |
24 | |
25 | #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) | |
26 | extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */ | |
27 | /* | |
28 | * Add standard checks that preemption cannot occur when using get_paca(): | |
29 | * otherwise the paca_struct it points to may be the wrong one just after. | |
30 | */ | |
31 | #define get_paca() ((void) debug_smp_processor_id(), local_paca) | |
32 | #else | |
1da177e4 | 33 | #define get_paca() local_paca |
048c8bc9 HD |
34 | #endif |
35 | ||
3356bb9f | 36 | #define get_lppaca() (get_paca()->lppaca_ptr) |
2f6093c8 | 37 | #define get_slb_shadow() (get_paca()->slb_shadow_ptr) |
1da177e4 LT |
38 | |
39 | struct task_struct; | |
1da177e4 LT |
40 | |
41 | /* | |
42 | * Defines the layout of the paca. | |
43 | * | |
44 | * This structure is not directly accessed by firmware or the service | |
45 | * processor except for the first two pointers that point to the | |
1888e7b5 DG |
46 | * lppaca area and the ItLpRegSave area for this CPU. The lppaca |
47 | * object is currently contained within the PACA but it doesn't need | |
48 | * to be. | |
1da177e4 LT |
49 | */ |
50 | struct paca_struct { | |
51 | /* | |
52 | * Because hw_cpu_id, unlike other paca fields, is accessed | |
53 | * routinely from other CPUs (from the IRQ code), we stick to | |
54 | * read-only (after boot) fields in the first cacheline to | |
55 | * avoid cacheline bouncing. | |
56 | */ | |
57 | ||
58 | /* | |
59 | * MAGIC: These first two pointers can't be moved - they're | |
60 | * accessed by the firmware | |
61 | */ | |
62 | struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ | |
1888e7b5 DG |
63 | #ifdef CONFIG_PPC_ISERIES |
64 | void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */ | |
65 | #endif /* CONFIG_PPC_ISERIES */ | |
1da177e4 LT |
66 | |
67 | /* | |
2ef9481e | 68 | * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c |
1da177e4 LT |
69 | * load lock_token and paca_index with a single lwz |
70 | * instruction. They must travel together and be properly | |
71 | * aligned. | |
72 | */ | |
73 | u16 lock_token; /* Constant 0x8000, used in locks */ | |
74 | u16 paca_index; /* Logical processor number */ | |
75 | ||
1da177e4 LT |
76 | u64 kernel_toc; /* Kernel TOC address */ |
77 | u64 stab_real; /* Absolute address of segment table */ | |
78 | u64 stab_addr; /* Virtual address of segment table */ | |
79 | void *emergency_sp; /* pointer to emergency stack */ | |
7a0268fa | 80 | u64 data_offset; /* per cpu data offset */ |
1da177e4 LT |
81 | s16 hw_cpu_id; /* Physical processor number */ |
82 | u8 cpu_start; /* At startup, processor spins until */ | |
83 | /* this becomes non-zero. */ | |
e91948fd | 84 | struct slb_shadow *slb_shadow_ptr; |
1da177e4 LT |
85 | |
86 | /* | |
87 | * Now, starting in cacheline 2, the exception save areas | |
88 | */ | |
3c726f8d BH |
89 | /* used for most interrupts/exceptions */ |
90 | u64 exgen[10] __attribute__((aligned(0x80))); | |
91 | u64 exmc[10]; /* used for machine checks */ | |
92 | u64 exslb[10]; /* used for SLB/segment table misses | |
93 | * on the linear mapping */ | |
3c726f8d | 94 | |
1da177e4 | 95 | mm_context_t context; |
bf72aeba | 96 | u16 vmalloc_sllp; |
1da177e4 | 97 | u16 slb_cache_ptr; |
d0f13e3c | 98 | u16 slb_cache[SLB_CACHE_ENTRIES]; |
1da177e4 LT |
99 | |
100 | /* | |
101 | * then miscellaneous read-write fields | |
102 | */ | |
103 | struct task_struct *__current; /* Pointer to current */ | |
104 | u64 kstack; /* Saved Kernel stack addr */ | |
105 | u64 stab_rr; /* stab/slb round-robin counter */ | |
1da177e4 LT |
106 | u64 saved_r1; /* r1 save for RTAS calls */ |
107 | u64 saved_msr; /* MSR saved here by enter_rtas */ | |
68730401 | 108 | u16 trap_save; /* Used when bad stack is encountered */ |
d04c56f7 PM |
109 | u8 soft_enabled; /* irq soft-enable flag */ |
110 | u8 hard_enabled; /* set if irqs are enabled in MSR */ | |
f007cacf | 111 | u8 io_sync; /* writel() needs spin_unlock sync */ |
c6622f63 PM |
112 | |
113 | /* Stuff for accurate time accounting */ | |
114 | u64 user_time; /* accumulated usermode TB ticks */ | |
115 | u64 system_time; /* accumulated system TB ticks */ | |
116 | u64 startpurr; /* PURR/TB value snapshot */ | |
4603ac18 | 117 | u64 startspurr; /* SPURR value snapshot */ |
1da177e4 LT |
118 | }; |
119 | ||
120 | extern struct paca_struct paca[]; | |
121 | ||
88ced031 | 122 | #endif /* __KERNEL__ */ |
8882a4da | 123 | #endif /* _ASM_POWERPC_PACA_H */ |