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
17 #include <asm/types.h>
18 #include <asm/lppaca.h>
21 register struct paca_struct *local_paca asm("r13");
23 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
24 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
26 * Add standard checks that preemption cannot occur when using get_paca():
27 * otherwise the paca_struct it points to may be the wrong one just after.
29 #define get_paca() ((void) debug_smp_processor_id(), local_paca)
31 #define get_paca() local_paca
34 #define get_lppaca() (get_paca()->lppaca_ptr)
35 #define get_slb_shadow() (get_paca()->slb_shadow_ptr)
40 * Defines the layout of the paca.
42 * This structure is not directly accessed by firmware or the service
47 * Because hw_cpu_id, unlike other paca fields, is accessed
48 * routinely from other CPUs (from the IRQ code), we stick to
49 * read-only (after boot) fields in the first cacheline to
50 * avoid cacheline bouncing.
53 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
56 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
57 * load lock_token and paca_index with a single lwz
58 * instruction. They must travel together and be properly
61 u16 lock_token; /* Constant 0x8000, used in locks */
62 u16 paca_index; /* Logical processor number */
64 u64 kernel_toc; /* Kernel TOC address */
65 u64 kernelbase; /* Base address of kernel */
66 u64 kernel_msr; /* MSR while running in kernel */
67 u64 stab_real; /* Absolute address of segment table */
68 u64 stab_addr; /* Virtual address of segment table */
69 void *emergency_sp; /* pointer to emergency stack */
70 u64 data_offset; /* per cpu data offset */
71 s16 hw_cpu_id; /* Physical processor number */
72 u8 cpu_start; /* At startup, processor spins until */
73 /* this becomes non-zero. */
74 struct slb_shadow *slb_shadow_ptr;
77 * Now, starting in cacheline 2, the exception save areas
79 /* used for most interrupts/exceptions */
80 u64 exgen[10] __attribute__((aligned(0x80)));
81 u64 exmc[10]; /* used for machine checks */
82 u64 exslb[10]; /* used for SLB/segment table misses
83 * on the linear mapping */
88 u16 slb_cache[SLB_CACHE_ENTRIES];
91 * then miscellaneous read-write fields
93 struct task_struct *__current; /* Pointer to current */
94 u64 kstack; /* Saved Kernel stack addr */
95 u64 stab_rr; /* stab/slb round-robin counter */
96 u64 saved_r1; /* r1 save for RTAS calls */
97 u64 saved_msr; /* MSR saved here by enter_rtas */
98 u16 trap_save; /* Used when bad stack is encountered */
99 u8 soft_enabled; /* irq soft-enable flag */
100 u8 hard_enabled; /* set if irqs are enabled in MSR */
101 u8 io_sync; /* writel() needs spin_unlock sync */
102 u8 perf_counter_pending; /* PM interrupt while soft-disabled */
104 /* Stuff for accurate time accounting */
105 u64 user_time; /* accumulated usermode TB ticks */
106 u64 system_time; /* accumulated system TB ticks */
107 u64 startpurr; /* PURR/TB value snapshot */
108 u64 startspurr; /* SPURR value snapshot */
111 extern struct paca_struct paca[];
112 extern void initialise_pacas(void);
114 #endif /* __KERNEL__ */
115 #endif /* _ASM_POWERPC_PACA_H */