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 21 register struct paca_struct *local_paca asm("r13"); 22 23 #if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) 24 extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */ 25 /* 26 * Add standard checks that preemption cannot occur when using get_paca(): 27 * otherwise the paca_struct it points to may be the wrong one just after. 28 */ 29 #define get_paca() ((void) debug_smp_processor_id(), local_paca) 30 #else 31 #define get_paca() local_paca 32 #endif 33 34 #define get_lppaca() (get_paca()->lppaca_ptr) 35 #define get_slb_shadow() (get_paca()->slb_shadow_ptr) 36 37 struct task_struct; 38 39 /* 40 * Defines the layout of the paca. 41 * 42 * This structure is not directly accessed by firmware or the service 43 * processor. 44 */ 45 struct paca_struct { 46 #ifdef CONFIG_PPC_BOOK3S 47 /* 48 * Because hw_cpu_id, unlike other paca fields, is accessed 49 * routinely from other CPUs (from the IRQ code), we stick to 50 * read-only (after boot) fields in the first cacheline to 51 * avoid cacheline bouncing. 52 */ 53 54 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ 55 #endif /* CONFIG_PPC_BOOK3S */ 56 /* 57 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 58 * load lock_token and paca_index with a single lwz 59 * instruction. They must travel together and be properly 60 * aligned. 61 */ 62 u16 lock_token; /* Constant 0x8000, used in locks */ 63 u16 paca_index; /* Logical processor number */ 64 65 u64 kernel_toc; /* Kernel TOC address */ 66 u64 kernelbase; /* Base address of kernel */ 67 u64 kernel_msr; /* MSR while running in kernel */ 68 #ifdef CONFIG_PPC_STD_MMU_64 69 u64 stab_real; /* Absolute address of segment table */ 70 u64 stab_addr; /* Virtual address of segment table */ 71 #endif /* CONFIG_PPC_STD_MMU_64 */ 72 void *emergency_sp; /* pointer to emergency stack */ 73 u64 data_offset; /* per cpu data offset */ 74 s16 hw_cpu_id; /* Physical processor number */ 75 u8 cpu_start; /* At startup, processor spins until */ 76 /* this becomes non-zero. */ 77 #ifdef CONFIG_PPC_STD_MMU_64 78 struct slb_shadow *slb_shadow_ptr; 79 80 /* 81 * Now, starting in cacheline 2, the exception save areas 82 */ 83 /* used for most interrupts/exceptions */ 84 u64 exgen[10] __attribute__((aligned(0x80))); 85 u64 exmc[10]; /* used for machine checks */ 86 u64 exslb[10]; /* used for SLB/segment table misses 87 * on the linear mapping */ 88 /* SLB related definitions */ 89 u16 vmalloc_sllp; 90 u16 slb_cache_ptr; 91 u16 slb_cache[SLB_CACHE_ENTRIES]; 92 #endif /* CONFIG_PPC_STD_MMU_64 */ 93 94 mm_context_t context; 95 96 /* 97 * then miscellaneous read-write fields 98 */ 99 struct task_struct *__current; /* Pointer to current */ 100 u64 kstack; /* Saved Kernel stack addr */ 101 u64 stab_rr; /* stab/slb round-robin counter */ 102 u64 saved_r1; /* r1 save for RTAS calls */ 103 u64 saved_msr; /* MSR saved here by enter_rtas */ 104 u16 trap_save; /* Used when bad stack is encountered */ 105 u8 soft_enabled; /* irq soft-enable flag */ 106 u8 hard_enabled; /* set if irqs are enabled in MSR */ 107 u8 io_sync; /* writel() needs spin_unlock sync */ 108 u8 perf_counter_pending; /* PM interrupt while soft-disabled */ 109 110 /* Stuff for accurate time accounting */ 111 u64 user_time; /* accumulated usermode TB ticks */ 112 u64 system_time; /* accumulated system TB ticks */ 113 u64 startpurr; /* PURR/TB value snapshot */ 114 u64 startspurr; /* SPURR value snapshot */ 115 }; 116 117 extern struct paca_struct paca[]; 118 extern void initialise_pacas(void); 119 120 #endif /* __KERNEL__ */ 121 #endif /* _ASM_POWERPC_PACA_H */ 122