2 * include/asm-powerpc/paca.h
4 * This control block defines the PACA which defines the processor
5 * specific data for each logical processor on the system.
6 * There are some pointers defined that are utilized by PLIC.
8 * C 2001 PPC 64 Team, IBM Corp
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.
15 #ifndef _ASM_POWERPC_PACA_H
16 #define _ASM_POWERPC_PACA_H
19 #include <asm/types.h>
20 #include <asm/lppaca.h>
23 register struct paca_struct *local_paca asm("r13");
24 #define get_paca() local_paca
25 #define get_lppaca() (get_paca()->lppaca_ptr)
30 * Defines the layout of the paca.
32 * This structure is not directly accessed by firmware or the service
33 * processor except for the first two pointers that point to the
34 * lppaca area and the ItLpRegSave area for this CPU. The lppaca
35 * object is currently contained within the PACA but it doesn't need
40 * Because hw_cpu_id, unlike other paca fields, is accessed
41 * routinely from other CPUs (from the IRQ code), we stick to
42 * read-only (after boot) fields in the first cacheline to
43 * avoid cacheline bouncing.
47 * MAGIC: These first two pointers can't be moved - they're
48 * accessed by the firmware
50 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
51 #ifdef CONFIG_PPC_ISERIES
52 void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
53 #endif /* CONFIG_PPC_ISERIES */
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 stab_real; /* Absolute address of segment table */
66 u64 stab_addr; /* Virtual address of segment table */
67 void *emergency_sp; /* pointer to emergency stack */
68 u64 data_offset; /* per cpu data offset */
69 s16 hw_cpu_id; /* Physical processor number */
70 u8 cpu_start; /* At startup, processor spins until */
71 /* this becomes non-zero. */
74 * Now, starting in cacheline 2, the exception save areas
76 /* used for most interrupts/exceptions */
77 u64 exgen[10] __attribute__((aligned(0x80)));
78 u64 exmc[10]; /* used for machine checks */
79 u64 exslb[10]; /* used for SLB/segment table misses
80 * on the linear mapping */
81 #ifdef CONFIG_PPC_64K_PAGES
83 #endif /* CONFIG_PPC_64K_PAGES */
86 u16 slb_cache[SLB_CACHE_ENTRIES];
90 * then miscellaneous read-write fields
92 struct task_struct *__current; /* Pointer to current */
93 u64 kstack; /* Saved Kernel stack addr */
94 u64 stab_rr; /* stab/slb round-robin counter */
95 u64 saved_r1; /* r1 save for RTAS calls */
96 u64 saved_msr; /* MSR saved here by enter_rtas */
97 u8 proc_enabled; /* irq soft-enable flag */
99 /* Stuff for accurate time accounting */
100 u64 user_time; /* accumulated usermode TB ticks */
101 u64 system_time; /* accumulated system TB ticks */
102 u64 startpurr; /* PURR/TB value snapshot */
105 extern struct paca_struct paca[];
107 void setup_boot_paca(void);
109 #endif /* __KERNEL__ */
110 #endif /* _ASM_POWERPC_PACA_H */