/*

   * include/asm-powerpc/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");
  #define get_paca()	local_paca

  #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 except for the first two pointers that point to the

   * lppaca area and the ItLpRegSave area for this CPU.  The lppaca
   * object is currently contained within the PACA but it doesn't need
   * to be.

   */
  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.
  	 */
  
  	/*
  	 * MAGIC: These first two pointers can't be moved - they're
  	 * accessed by the firmware
  	 */
  	struct lppaca *lppaca_ptr;	/* Pointer to LpPaca for PLIC */

  #ifdef CONFIG_PPC_ISERIES
  	void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */
  #endif /* CONFIG_PPC_ISERIES */

  
  	/*

  	 * 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 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 */

  };
  
  extern struct paca_struct paca[];

  void setup_boot_paca(void);

  #endif /* __KERNEL__ */

  #endif /* _ASM_POWERPC_PACA_H */