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paca.h

/*
 * This control block defines the PACA which defines the processor
 * specific data for each logical processor on the system.
 * There are some pointers defined that are utilized by PLIC.
 *
 * C 2001 PPC 64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#ifndef _ASM_POWERPC_PACA_H
#define _ASM_POWERPC_PACA_H
#ifdef __KERNEL__

#include    <asm/types.h>
#include    <asm/lppaca.h>
#include    <asm/mmu.h>

register struct paca_struct *local_paca asm("r13");

#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
/*
 * Add standard checks that preemption cannot occur when using get_paca():
 * otherwise the paca_struct it points to may be the wrong one just after.
 */
#define get_paca()      ((void) debug_smp_processor_id(), local_paca)
#else
#define get_paca()      local_paca
#endif

#define get_lppaca()    (get_paca()->lppaca_ptr)
#define get_slb_shadow()      (get_paca()->slb_shadow_ptr)

struct task_struct;

/*
 * Defines the layout of the paca.
 *
 * This structure is not directly accessed by firmware or the service
 * processor.
 */
struct paca_struct {
      /*
       * Because hw_cpu_id, unlike other paca fields, is accessed
       * routinely from other CPUs (from the IRQ code), we stick to
       * read-only (after boot) fields in the first cacheline to
       * avoid cacheline bouncing.
       */

      struct lppaca *lppaca_ptr;    /* Pointer to LpPaca for PLIC */

      /*
       * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 
       * load lock_token and paca_index with a single lwz
       * instruction.  They must travel together and be properly
       * aligned.
       */
      u16 lock_token;               /* Constant 0x8000, used in locks */
      u16 paca_index;               /* Logical processor number */

      u64 kernel_toc;               /* Kernel TOC address */
      u64 kernelbase;               /* Base address of kernel */
      u64 kernel_msr;               /* MSR while running in kernel */
      u64 stab_real;                /* Absolute address of segment table */
      u64 stab_addr;                /* Virtual address of segment table */
      void *emergency_sp;           /* pointer to emergency stack */
      u64 data_offset;        /* per cpu data offset */
      s16 hw_cpu_id;                /* Physical processor number */
      u8 cpu_start;                 /* At startup, processor spins until */
                              /* this becomes non-zero. */
      struct slb_shadow *slb_shadow_ptr;

      /*
       * Now, starting in cacheline 2, the exception save areas
       */
      /* used for most interrupts/exceptions */
      u64 exgen[10] __attribute__((aligned(0x80)));
      u64 exmc[10];           /* used for machine checks */
      u64 exslb[10];          /* used for SLB/segment table misses
                         * on the linear mapping */

      mm_context_t context;
      u16 vmalloc_sllp;
      u16 slb_cache_ptr;
      u16 slb_cache[SLB_CACHE_ENTRIES];

      /*
       * then miscellaneous read-write fields
       */
      struct task_struct *__current;      /* Pointer to current */
      u64 kstack;             /* Saved Kernel stack addr */
      u64 stab_rr;                  /* stab/slb round-robin counter */
      u64 saved_r1;                 /* r1 save for RTAS calls */
      u64 saved_msr;                /* MSR saved here by enter_rtas */
      u16 trap_save;                /* Used when bad stack is encountered */
      u8 soft_enabled;        /* irq soft-enable flag */
      u8 hard_enabled;        /* set if irqs are enabled in MSR */
      u8 io_sync;             /* writel() needs spin_unlock sync */

      /* Stuff for accurate time accounting */
      u64 user_time;                /* accumulated usermode TB ticks */
      u64 system_time;        /* accumulated system TB ticks */
      u64 startpurr;                /* PURR/TB value snapshot */
      u64 startspurr;               /* SPURR value snapshot */
};

extern struct paca_struct paca[];
extern void initialise_pacas(void);

#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_PACA_H */

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