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 29register struct paca_struct *local_paca asm("r13"); 30 31#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP) 32extern 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 45struct task_struct; 46struct opal_machine_check_event; 47 48/* 49 * Defines the layout of the paca. 50 * 51 * This structure is not directly accessed by firmware or the service 52 * processor. 53 */ 54struct paca_struct { 55#ifdef CONFIG_PPC_BOOK3S 56 /* 57 * Because hw_cpu_id, unlike other paca fields, is accessed 58 * routinely from other CPUs (from the IRQ code), we stick to 59 * read-only (after boot) fields in the first cacheline to 60 * avoid cacheline bouncing. 61 */ 62 63 struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ 64#endif /* CONFIG_PPC_BOOK3S */ 65 /* 66 * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c 67 * load lock_token and paca_index with a single lwz 68 * instruction. They must travel together and be properly 69 * aligned. 70 */ 71 u16 lock_token; /* Constant 0x8000, used in locks */ 72 u16 paca_index; /* Logical processor number */ 73 74 u64 kernel_toc; /* Kernel TOC address */ 75 u64 kernelbase; /* Base address of kernel */ 76 u64 kernel_msr; /* MSR while running in kernel */ 77#ifdef CONFIG_PPC_STD_MMU_64 78 u64 stab_real; /* Absolute address of segment table */ 79 u64 stab_addr; /* Virtual address of segment table */ 80#endif /* CONFIG_PPC_STD_MMU_64 */ 81 void *emergency_sp; /* pointer to emergency stack */ 82 u64 data_offset; /* per cpu data offset */ 83 s16 hw_cpu_id; /* Physical processor number */ 84 u8 cpu_start; /* At startup, processor spins until */ 85 /* this becomes non-zero. */ 86 u8 kexec_state; /* set when kexec down has irqs off */ 87#ifdef CONFIG_PPC_STD_MMU_64 88 struct slb_shadow *slb_shadow_ptr; 89 struct dtl_entry *dispatch_log; 90 struct dtl_entry *dispatch_log_end; 91 92 /* 93 * Now, starting in cacheline 2, the exception save areas 94 */ 95 /* used for most interrupts/exceptions */ 96 u64 exgen[12] __attribute__((aligned(0x80))); 97 u64 exmc[12]; /* used for machine checks */ 98 u64 exslb[12]; /* used for SLB/segment table misses 99 * on the linear mapping */ 100 /* SLB related definitions */ 101 u16 vmalloc_sllp; 102 u16 slb_cache_ptr; 103 u32 slb_cache[SLB_CACHE_ENTRIES]; 104#endif /* CONFIG_PPC_STD_MMU_64 */ 105 106#ifdef CONFIG_PPC_BOOK3E 107 u64 exgen[8] __attribute__((aligned(0x80))); 108 /* Keep pgd in the same cacheline as the start of extlb */ 109 pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */ 110 pgd_t *kernel_pgd; /* Kernel PGD */ 111 /* We can have up to 3 levels of reentrancy in the TLB miss handler */ 112 u64 extlb[3][EX_TLB_SIZE / sizeof(u64)]; 113 u64 exmc[8]; /* used for machine checks */ 114 u64 excrit[8]; /* used for crit interrupts */ 115 u64 exdbg[8]; /* used for debug interrupts */ 116 117 /* Kernel stack pointers for use by special exceptions */ 118 void *mc_kstack; 119 void *crit_kstack; 120 void *dbg_kstack; 121#endif /* CONFIG_PPC_BOOK3E */ 122 123 mm_context_t context; 124 125 /* 126 * then miscellaneous read-write fields 127 */ 128 struct task_struct *__current; /* Pointer to current */ 129 u64 kstack; /* Saved Kernel stack addr */ 130 u64 stab_rr; /* stab/slb round-robin counter */ 131 u64 saved_r1; /* r1 save for RTAS calls or PM */ 132 u64 saved_msr; /* MSR saved here by enter_rtas */ 133 u16 trap_save; /* Used when bad stack is encountered */ 134 u8 soft_enabled; /* irq soft-enable flag */ 135 u8 irq_happened; /* irq happened while soft-disabled */ 136 u8 io_sync; /* writel() needs spin_unlock sync */ 137 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 138 u8 nap_state_lost; /* NV GPR values lost in power7_idle */ 139 u64 sprg3; /* Saved user-visible sprg */ 140#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 141 u64 tm_scratch; /* TM scratch area for reclaim */ 142#endif 143 144#ifdef CONFIG_PPC_POWERNV 145 /* Pointer to OPAL machine check event structure set by the 146 * early exception handler for use by high level C handler 147 */ 148 struct opal_machine_check_event *opal_mc_evt; 149#endif 150 151 /* Stuff for accurate time accounting */ 152 u64 user_time; /* accumulated usermode TB ticks */ 153 u64 system_time; /* accumulated system TB ticks */ 154 u64 user_time_scaled; /* accumulated usermode SPURR ticks */ 155 u64 starttime; /* TB value snapshot */ 156 u64 starttime_user; /* TB value on exit to usermode */ 157 u64 startspurr; /* SPURR value snapshot */ 158 u64 utime_sspurr; /* ->user_time when ->startspurr set */ 159 u64 stolen_time; /* TB ticks taken by hypervisor */ 160 u64 dtl_ridx; /* read index in dispatch log */ 161 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 162 163#ifdef CONFIG_KVM_BOOK3S_HANDLER 164#ifdef CONFIG_KVM_BOOK3S_PR 165 /* We use this to store guest state in */ 166 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 167#endif 168 struct kvmppc_host_state kvm_hstate; 169#endif 170}; 171 172extern struct paca_struct *paca; 173extern void initialise_paca(struct paca_struct *new_paca, int cpu); 174extern void setup_paca(struct paca_struct *new_paca); 175extern void allocate_pacas(void); 176extern void free_unused_pacas(void); 177 178#else /* CONFIG_PPC64 */ 179 180static inline void allocate_pacas(void) { }; 181static inline void free_unused_pacas(void) { }; 182 183#endif /* CONFIG_PPC64 */ 184 185#endif /* __KERNEL__ */ 186#endif /* _ASM_POWERPC_PACA_H */ 187