blob: 2d4585f062099da36e7ac6fdc8085e68faae1969 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
David Gibson8882a4d2005-11-09 13:38:01 +11002 * include/asm-powerpc/paca.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
David Gibson8882a4d2005-11-09 13:38:01 +11004 * This control block defines the PACA which defines the processor
5 * specific data for each logical processor on the system.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * 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.
David Gibson8882a4d2005-11-09 13:38:01 +110014 */
15#ifndef _ASM_POWERPC_PACA_H
16#define _ASM_POWERPC_PACA_H
Arnd Bergmann88ced032005-12-16 22:43:46 +010017#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/types.h>
20#include <asm/lppaca.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/mmu.h>
22
23register struct paca_struct *local_paca asm("r13");
24#define get_paca() local_paca
David Gibson3356bb92006-01-13 10:26:42 +110025#define get_lppaca() (get_paca()->lppaca_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29/*
30 * Defines the layout of the paca.
31 *
32 * This structure is not directly accessed by firmware or the service
33 * processor except for the first two pointers that point to the
David Gibson1888e7b2005-11-24 16:34:45 +110034 * lppaca area and the ItLpRegSave area for this CPU. The lppaca
35 * object is currently contained within the PACA but it doesn't need
36 * to be.
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 */
38struct paca_struct {
39 /*
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.
44 */
45
46 /*
47 * MAGIC: These first two pointers can't be moved - they're
48 * accessed by the firmware
49 */
50 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */
David Gibson1888e7b2005-11-24 16:34:45 +110051#ifdef CONFIG_PPC_ISERIES
52 void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
53#endif /* CONFIG_PPC_ISERIES */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55 /*
Jon Mason2ef94812006-01-23 10:58:20 -060056 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 * load lock_token and paca_index with a single lwz
58 * instruction. They must travel together and be properly
59 * aligned.
60 */
61 u16 lock_token; /* Constant 0x8000, used in locks */
62 u16 paca_index; /* Logical processor number */
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 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 */
Anton Blanchard7a0268f2006-01-11 13:16:44 +110068 u64 data_offset; /* per cpu data offset */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 s16 hw_cpu_id; /* Physical processor number */
70 u8 cpu_start; /* At startup, processor spins until */
71 /* this becomes non-zero. */
72
73 /*
74 * Now, starting in cacheline 2, the exception save areas
75 */
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110076 /* 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 */
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 mm_context_t context;
Paul Mackerrasbf72aeb2006-06-15 10:45:18 +100083 u16 vmalloc_sllp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 u16 slb_cache[SLB_CACHE_ENTRIES];
85 u16 slb_cache_ptr;
86
87 /*
88 * then miscellaneous read-write fields
89 */
90 struct task_struct *__current; /* Pointer to current */
91 u64 kstack; /* Saved Kernel stack addr */
92 u64 stab_rr; /* stab/slb round-robin counter */
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 u64 saved_r1; /* r1 save for RTAS calls */
94 u64 saved_msr; /* MSR saved here by enter_rtas */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 u8 proc_enabled; /* irq soft-enable flag */
Paul Mackerrasc6622f62006-02-24 10:06:59 +110096
97 /* Stuff for accurate time accounting */
98 u64 user_time; /* accumulated usermode TB ticks */
99 u64 system_time; /* accumulated system TB ticks */
100 u64 startpurr; /* PURR/TB value snapshot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101};
102
103extern struct paca_struct paca[];
104
Anton Blanchard4df20462006-03-25 17:25:17 +1100105void setup_boot_paca(void);
106
Arnd Bergmann88ced032005-12-16 22:43:46 +0100107#endif /* __KERNEL__ */
David Gibson8882a4d2005-11-09 13:38:01 +1100108#endif /* _ASM_POWERPC_PACA_H */