release/src-rt-6.x.4708/linux/linux-2.6.36/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 #ifdef CONFIG_PPC64
  18
  19 #include <linux/init.h>
  20 #include <asm/types.h>
  21 #include <asm/lppaca.h>
  22 #include <asm/mmu.h>
  23 #include <asm/page.h>
  24 #include <asm/exception-64e.h>
  25 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  26 #include <asm/kvm_book3s_asm.h>
  27 #endif
  28
  29 register struct paca_struct *local_paca asm("r13");
  30
  31 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
  32 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
  33 /*
  34  * Add standard checks that preemption cannot occur when using get_paca():
  35  * otherwise the paca_struct it points to may be the wrong one just after.
  36  */
  37 #define get_paca()      ((void) debug_smp_processor_id(), local_paca)
  38 #else
  39 #define get_paca()      local_paca
  40 #endif
  41
  42 #define get_lppaca()    (get_paca()->lppaca_ptr)
  43 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  44
  45 struct task_struct;
  46
  47 /*
  48  * Defines the layout of the paca.
  49  *
  50  * This structure is not directly accessed by firmware or the service
  51  * processor.
  52  */
  53 struct paca_struct {
  54 #ifdef CONFIG_PPC_BOOK3S
  55         /*
  56          * Because hw_cpu_id, unlike other paca fields, is accessed
  57          * routinely from other CPUs (from the IRQ code), we stick to
  58          * read-only (after boot) fields in the first cacheline to
  59          * avoid cacheline bouncing.
  60          */
  61
  62         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  63 #endif /* CONFIG_PPC_BOOK3S */
  64         /*
  65          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  66          * load lock_token and paca_index with a single lwz
  67          * instruction.  They must travel together and be properly
  68          * aligned.
  69          */
  70         u16 lock_token;                 /* Constant 0x8000, used in locks */
  71         u16 paca_index;                 /* Logical processor number */
  72
  73         u64 kernel_toc;                 /* Kernel TOC address */
  74         u64 kernelbase;                 /* Base address of kernel */
  75         u64 kernel_msr;                 /* MSR while running in kernel */
  76 #ifdef CONFIG_PPC_STD_MMU_64
  77         u64 stab_real;                  /* Absolute address of segment table */
  78         u64 stab_addr;                  /* Virtual address of segment table */
  79 #endif /* CONFIG_PPC_STD_MMU_64 */
  80         void *emergency_sp;             /* pointer to emergency stack */
  81         u64 data_offset;                /* per cpu data offset */
  82         s16 hw_cpu_id;                  /* Physical processor number */
  83         u8 cpu_start;                   /* At startup, processor spins until */
  84                                         /* this becomes non-zero. */
  85         u8 kexec_state;         /* set when kexec down has irqs off */
  86 #ifdef CONFIG_PPC_STD_MMU_64
  87         struct slb_shadow *slb_shadow_ptr;
  88
  89         /*
  90          * Now, starting in cacheline 2, the exception save areas
  91          */
  92         /* used for most interrupts/exceptions */
  93         u64 exgen[10] __attribute__((aligned(0x80)));
  94         u64 exmc[10];           /* used for machine checks */
  95         u64 exslb[10];          /* used for SLB/segment table misses
  96                                  * on the linear mapping */
  97         /* SLB related definitions */
  98         u16 vmalloc_sllp;
  99         u16 slb_cache_ptr;
 100         u16 slb_cache[SLB_CACHE_ENTRIES];
 101 #endif /* CONFIG_PPC_STD_MMU_64 */
 102
 103 #ifdef CONFIG_PPC_BOOK3E
 104         pgd_t *pgd;                     /* Current PGD */
 105         pgd_t *kernel_pgd;              /* Kernel PGD */
 106         u64 exgen[8] __attribute__((aligned(0x80)));
 107         u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
 108         u64 exmc[8];            /* used for machine checks */
 109         u64 excrit[8];          /* used for crit interrupts */
 110         u64 exdbg[8];           /* used for debug interrupts */
 111
 112         /* Kernel stack pointers for use by special exceptions */
 113         void *mc_kstack;
 114         void *crit_kstack;
 115         void *dbg_kstack;
 116 #endif /* CONFIG_PPC_BOOK3E */
 117
 118         mm_context_t context;
 119
 120         /*
 121          * then miscellaneous read-write fields
 122          */
 123         struct task_struct *__current;  /* Pointer to current */
 124         u64 kstack;                     /* Saved Kernel stack addr */
 125         u64 stab_rr;                    /* stab/slb round-robin counter */
 126         u64 saved_r1;                   /* r1 save for RTAS calls */
 127         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 128         u16 trap_save;                  /* Used when bad stack is encountered */
 129         u8 soft_enabled;                /* irq soft-enable flag */
 130         u8 hard_enabled;                /* set if irqs are enabled in MSR */
 131         u8 io_sync;                     /* writel() needs spin_unlock sync */
 132         u8 perf_event_pending;          /* PM interrupt while soft-disabled */
 133
 134         /* Stuff for accurate time accounting */
 135         u64 user_time;                  /* accumulated usermode TB ticks */
 136         u64 system_time;                /* accumulated system TB ticks */
 137         u64 startpurr;                  /* PURR/TB value snapshot */
 138         u64 startspurr;                 /* SPURR value snapshot */
 139
 140 #ifdef CONFIG_KVM_BOOK3S_HANDLER
 141         /* We use this to store guest state in */
 142         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 143 #endif
 144 };
 145
 146 extern struct paca_struct *paca;
 147 extern __initdata struct paca_struct boot_paca;
 148 extern void initialise_paca(struct paca_struct *new_paca, int cpu);
 149 extern void setup_paca(struct paca_struct *new_paca);
 150 extern void allocate_pacas(void);
 151 extern void free_unused_pacas(void);
 152
 153 #else /* CONFIG_PPC64 */
 154
 155 static inline void allocate_pacas(void) { };
 156 static inline void free_unused_pacas(void) { };
 157
 158 #endif /* CONFIG_PPC64 */
 159
 160 #endif /* __KERNEL__ */
 161 #endif /* _ASM_POWERPC_PACA_H */