| 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 | |
| 109 | /* Stuff for accurate time accounting */ |
| 110 | u64 user_time; /* accumulated usermode TB ticks */ |
| 111 | u64 system_time; /* accumulated system TB ticks */ |
| 112 | u64 startpurr; /* PURR/TB value snapshot */ |
| 113 | u64 startspurr; /* SPURR value snapshot */ |
| 114 | }; |
| 115 | |
| 116 | extern struct paca_struct paca[]; |
| 117 | extern void initialise_pacas(void); |
| 118 | |
| 119 | #endif /* __KERNEL__ */ |
| 120 | #endif /* _ASM_POWERPC_PACA_H */ |