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 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  23 #include <asm/kvm_book3s_64_asm.h>
  24 #endif
  25
  26 register struct paca_struct *local_paca asm("r13");
  27
  28 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
  29 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
  30 /*
  31  * Add standard checks that preemption cannot occur when using get_paca():
  32  * otherwise the paca_struct it points to may be the wrong one just after.
  33  */
  34 #define get_paca()      ((void) debug_smp_processor_id(), local_paca)
  35 #else
  36 #define get_paca()      local_paca
  37 #endif
  38
  39 #define get_lppaca()    (get_paca()->lppaca_ptr)
  40 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)
  41
  42 struct task_struct;
  43
  44 /*
  45  * Defines the layout of the paca.
  46  *
  47  * This structure is not directly accessed by firmware or the service
  48  * processor.
  49  */
  50 struct paca_struct {
  51 #ifdef CONFIG_PPC_BOOK3S
  52         /*
  53          * Because hw_cpu_id, unlike other paca fields, is accessed
  54          * routinely from other CPUs (from the IRQ code), we stick to
  55          * read-only (after boot) fields in the first cacheline to
  56          * avoid cacheline bouncing.
  57          */
  58
  59         struct lppaca *lppaca_ptr;      /* Pointer to LpPaca for PLIC */
  60 #endif /* CONFIG_PPC_BOOK3S */
  61         /*
  62          * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c
  63          * load lock_token and paca_index with a single lwz
  64          * instruction.  They must travel together and be properly
  65          * aligned.
  66          */
  67         u16 lock_token;                 /* Constant 0x8000, used in locks */
  68         u16 paca_index;                 /* Logical processor number */
  69
  70         u64 kernel_toc;                 /* Kernel TOC address */
  71         u64 kernelbase;                 /* Base address of kernel */
  72         u64 kernel_msr;                 /* MSR while running in kernel */
  73 #ifdef CONFIG_PPC_STD_MMU_64
  74         u64 stab_real;                  /* Absolute address of segment table */
  75         u64 stab_addr;                  /* Virtual address of segment table */
  76 #endif /* CONFIG_PPC_STD_MMU_64 */
  77         void *emergency_sp;             /* pointer to emergency stack */
  78         u64 data_offset;                /* per cpu data offset */
  79         s16 hw_cpu_id;                  /* Physical processor number */
  80         u8 cpu_start;                   /* At startup, processor spins until */
  81                                         /* this becomes non-zero. */
  82 #ifdef CONFIG_PPC_STD_MMU_64
  83         struct slb_shadow *slb_shadow_ptr;
  84
  85         /*
  86          * Now, starting in cacheline 2, the exception save areas
  87          */
  88         /* used for most interrupts/exceptions */
  89         u64 exgen[10] __attribute__((aligned(0x80)));
  90         u64 exmc[10];           /* used for machine checks */
  91         u64 exslb[10];          /* used for SLB/segment table misses
  92                                  * on the linear mapping */
  93         /* SLB related definitions */
  94         u16 vmalloc_sllp;
  95         u16 slb_cache_ptr;
  96         u16 slb_cache[SLB_CACHE_ENTRIES];
  97 #endif /* CONFIG_PPC_STD_MMU_64 */
  98
  99 #ifdef CONFIG_PPC_BOOK3E
 100         pgd_t *pgd;                     /* Current PGD */
 101         pgd_t *kernel_pgd;              /* Kernel PGD */
 102         u64 exgen[8] __attribute__((aligned(0x80)));
 103         u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
 104         u64 exmc[8];            /* used for machine checks */
 105         u64 excrit[8];          /* used for crit interrupts */
 106         u64 exdbg[8];           /* used for debug interrupts */
 107
 108         /* Kernel stack pointers for use by special exceptions */
 109         void *mc_kstack;
 110         void *crit_kstack;
 111         void *dbg_kstack;
 112 #endif /* CONFIG_PPC_BOOK3E */
 113
 114         mm_context_t context;
 115
 116         /*
 117          * then miscellaneous read-write fields
 118          */
 119         struct task_struct *__current;  /* Pointer to current */
 120         u64 kstack;                     /* Saved Kernel stack addr */
 121         u64 stab_rr;                    /* stab/slb round-robin counter */
 122         u64 saved_r1;                   /* r1 save for RTAS calls */
 123         u64 saved_msr;                  /* MSR saved here by enter_rtas */
 124         u16 trap_save;                  /* Used when bad stack is encountered */
 125         u8 soft_enabled;                /* irq soft-enable flag */
 126         u8 hard_enabled;                /* set if irqs are enabled in MSR */
 127         u8 io_sync;                     /* writel() needs spin_unlock sync */
 128         u8 perf_event_pending;          /* PM interrupt while soft-disabled */
 129
 130         /* Stuff for accurate time accounting */
 131         u64 user_time;                  /* accumulated usermode TB ticks */
 132         u64 system_time;                /* accumulated system TB ticks */
 133         u64 startpurr;                  /* PURR/TB value snapshot */
 134         u64 startspurr;                 /* SPURR value snapshot */
 135
 136 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 137         struct  {
 138                 u64     esid;
 139                 u64     vsid;
 140         } kvm_slb[64];                  /* guest SLB */
 141         /* We use this to store guest state in */
 142         struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
 143         u8 kvm_slb_max;                 /* highest used guest slb entry */
 144         u8 kvm_in_guest;                /* are we inside the guest? */
 145 #endif
 146 };
 147
 148 extern struct paca_struct paca[];
 149 extern void initialise_pacas(void);
 150
 151 #endif /* __KERNEL__ */
 152 #endif /* _ASM_POWERPC_PACA_H */