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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/powerpc/include/asm/paca.h
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 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. */
72 struct slb_shadow
*slb_shadow_ptr
;
75 * Now, starting in cacheline 2, the exception save areas
77 /* used for most interrupts/exceptions */
78 u64 exgen
[10] __attribute__((aligned(0x80)));
79 u64 exmc
[10]; /* used for machine checks */
80 u64 exslb
[10]; /* used for SLB/segment table misses
81 * on the linear mapping */
86 u16 slb_cache
[SLB_CACHE_ENTRIES
];
89 * then miscellaneous read-write fields
91 struct task_struct
*__current
; /* Pointer to current */
92 u64 kstack
; /* Saved Kernel stack addr */
93 u64 stab_rr
; /* stab/slb round-robin counter */
94 u64 saved_r1
; /* r1 save for RTAS calls */
95 u64 saved_msr
; /* MSR saved here by enter_rtas */
96 u16 trap_save
; /* Used when bad stack is encountered */
97 u8 soft_enabled
; /* irq soft-enable flag */
98 u8 hard_enabled
; /* set if irqs are enabled in MSR */
99 u8 io_sync
; /* writel() needs spin_unlock sync */
101 /* Stuff for accurate time accounting */
102 u64 user_time
; /* accumulated usermode TB ticks */
103 u64 system_time
; /* accumulated system TB ticks */
104 u64 startpurr
; /* PURR/TB value snapshot */
105 u64 startspurr
; /* SPURR value snapshot */
108 extern struct paca_struct paca
[];
109 extern void initialise_pacas(void);
111 #endif /* __KERNEL__ */
112 #endif /* _ASM_POWERPC_PACA_H */