arch/powerpc/include/asm/paca.h

   1 /*
   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.
   5  *
   6  * C 2001 PPC 64 Team, IBM Corp
   7  *
   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.
  12  */
  13 #ifndef _ASM_POWERPC_PACA_H
  14 #define _ASM_POWERPC_PACA_H
  15 #ifdef __KERNEL__
  16
  17 #include <asm/types.h>
  18 #include <asm/lppaca.h>
  19 #include <asm/mmu.h>
  20 #include <asm/page.h>
  21 #include <asm/exception-64e.h>
  22
  23 register struct paca_struct *local_paca asm("r13");
  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
  33 #define get_paca()      local_paca
  34 #endif
  35
  36 #define get_lppaca()    (get_paca()->lppaca_ptr)
  37 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  38
  39 struct task_struct;
  40
  41 /*
  42  * Defines the layout of the paca.
  43  *
  44  * This structure is not directly accessed by firmware or the service
  45  * processor.
  46  */
  47 struct paca_struct {
  48 #ifdef CONFIG_PPC_BOOK3S
  49         /*
  50          * Because hw_cpu_id, unlike other paca fields, is accessed
  51          * routinely from other CPUs (from the IRQ code), we stick to
  52          * read-only (after boot) fields in the first cacheline to
  53          * avoid cacheline bouncing.
  54          */
  55
  56         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  57 #endif /* CONFIG_PPC_BOOK3S */
  58         /*
  59          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  60          * load lock_token and paca_index with a single lwz
  61          * instruction.  They must travel together and be properly
  62          * aligned.
  63          */
  64         u16 lock_token;                 /* Constant 0x8000, used in locks */
  65         u16 paca_index;                 /* Logical processor number */
  66
  67         u64 kernel_toc;                 /* Kernel TOC address */
  68         u64 kernelbase;                 /* Base address of kernel */
  69         u64 kernel_msr;                 /* MSR while running in kernel */
  70 #ifdef CONFIG_PPC_STD_MMU_64
  71         u64 stab_real;                  /* Absolute address of segment table */
  72         u64 stab_addr;                  /* Virtual address of segment table */
  73 #endif /* CONFIG_PPC_STD_MMU_64 */
  74         void *emergency_sp;             /* pointer to emergency stack */
  75         u64 data_offset;                /* per cpu data offset */
  76         s16 hw_cpu_id;                  /* Physical processor number */
  77         u8 cpu_start;                   /* At startup, processor spins until */
  78                                         /* this becomes non-zero. */
  79 #ifdef CONFIG_PPC_STD_MMU_64
  80         struct slb_shadow *slb_shadow_ptr;
  81
  82         /*
  83          * Now, starting in cacheline 2, the exception save areas
  84          */
  85         /* used for most interrupts/exceptions */
  86         u64 exgen[10] __attribute__((aligned(0x80)));
  87         u64 exmc[10];           /* used for machine checks */
  88         u64 exslb[10];          /* used for SLB/segment table misses
  89                                  * on the linear mapping */
  90         /* SLB related definitions */
  91         u16 vmalloc_sllp;
  92         u16 slb_cache_ptr;
  93         u16 slb_cache[SLB_CACHE_ENTRIES];
  94 #endif /* CONFIG_PPC_STD_MMU_64 */
  95
  96 #ifdef CONFIG_PPC_BOOK3E
  97         pgd_t *pgd;                     /* Current PGD */
  98         pgd_t *kernel_pgd;              /* Kernel PGD */
  99         u64 exgen[8] __attribute__((aligned(0x80)));
 100         u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
 101         u64 exmc[8];            /* used for machine checks */
 102         u64 excrit[8];          /* used for crit interrupts */
 103         u64 exdbg[8];           /* used for debug interrupts */
 104
 105         /* Kernel stack pointers for use by special exceptions */
 106         void *mc_kstack;
 107         void *crit_kstack;
 108         void *dbg_kstack;
 109 #endif /* CONFIG_PPC_BOOK3E */
 110
 111         mm_context_t context;
 112
 113         /*
 114          * then miscellaneous read-write fields
 115          */
 116         struct task_struct *__current;  /* Pointer to current */
 117         u64 kstack;                     /* Saved Kernel stack addr */
 118         u64 stab_rr;                    /* stab/slb round-robin counter */
 119         u64 saved_r1;                   /* r1 save for RTAS calls */
 120         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 121         u16 trap_save;                  /* Used when bad stack is encountered */
 122         u8 soft_enabled;                /* irq soft-enable flag */
 123         u8 hard_enabled;                /* set if irqs are enabled in MSR */
 124         u8 io_sync;                     /* writel() needs spin_unlock sync */
 125         u8 perf_event_pending;          /* PM interrupt while soft-disabled */
 126
 127         /* Stuff for accurate time accounting */
 128         u64 user_time;                  /* accumulated usermode TB ticks */
 129         u64 system_time;                /* accumulated system TB ticks */
 130         u64 startpurr;                  /* PURR/TB value snapshot */
 131         u64 startspurr;                 /* SPURR value snapshot */
 132 };
 133
 134 extern struct paca_struct paca[];
 135 extern void initialise_pacas(void);
 136
 137 #endif /* __KERNEL__ */
 138 #endif /* _ASM_POWERPC_PACA_H */