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; 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 */ 53struct 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 struct dtl_entry *dispatch_log; 89 struct dtl_entry *dispatch_log_end; 90 91 /* 92 * Now, starting in cacheline 2, the exception save areas 93 */ 94 /* used for most interrupts/exceptions */ 95 u64 exgen[10] __attribute__((aligned(0x80))); 96 u64 exmc[10]; /* used for machine checks */ 97 u64 exslb[10]; /* used for SLB/segment table misses 98 * on the linear mapping */ 99 /* SLB related definitions */ 100 u16 vmalloc_sllp; 101 u16 slb_cache_ptr; 102 u16 slb_cache[SLB_CACHE_ENTRIES]; 103#endif /* CONFIG_PPC_STD_MMU_64 */ 104 105#ifdef CONFIG_PPC_BOOK3E 106 pgd_t *pgd; /* Current PGD */ 107 pgd_t *kernel_pgd; /* Kernel PGD */ 108 u64 exgen[8] __attribute__((aligned(0x80))); 109 u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80))); 110 u64 exmc[8]; /* used for machine checks */ 111 u64 excrit[8]; /* used for crit interrupts */ 112 u64 exdbg[8]; /* used for debug interrupts */ 113 114 /* Kernel stack pointers for use by special exceptions */ 115 void *mc_kstack; 116 void *crit_kstack; 117 void *dbg_kstack; 118#endif /* CONFIG_PPC_BOOK3E */ 119 120 mm_context_t context; 121 122 /* 123 * then miscellaneous read-write fields 124 */ 125 struct task_struct *__current; /* Pointer to current */ 126 u64 kstack; /* Saved Kernel stack addr */ 127 u64 stab_rr; /* stab/slb round-robin counter */ 128 u64 saved_r1; /* r1 save for RTAS calls */ 129 u64 saved_msr; /* MSR saved here by enter_rtas */ 130 u16 trap_save; /* Used when bad stack is encountered */ 131 u8 soft_enabled; /* irq soft-enable flag */ 132 u8 hard_enabled; /* set if irqs are enabled in MSR */ 133 u8 io_sync; /* writel() needs spin_unlock sync */ 134 u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ 135 136 /* Stuff for accurate time accounting */ 137 u64 user_time; /* accumulated usermode TB ticks */ 138 u64 system_time; /* accumulated system TB ticks */ 139 u64 user_time_scaled; /* accumulated usermode SPURR ticks */ 140 u64 starttime; /* TB value snapshot */ 141 u64 starttime_user; /* TB value on exit to usermode */ 142 u64 startspurr; /* SPURR value snapshot */ 143 u64 utime_sspurr; /* ->user_time when ->startspurr set */ 144 u64 stolen_time; /* TB ticks taken by hypervisor */ 145 u64 dtl_ridx; /* read index in dispatch log */ 146 struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */ 147 148#ifdef CONFIG_KVM_BOOK3S_HANDLER 149 /* We use this to store guest state in */ 150 struct kvmppc_book3s_shadow_vcpu shadow_vcpu; 151#endif 152}; 153 154extern struct paca_struct *paca; 155extern __initdata struct paca_struct boot_paca; 156extern void initialise_paca(struct paca_struct *new_paca, int cpu); 157extern void setup_paca(struct paca_struct *new_paca); 158extern void allocate_pacas(void); 159extern void free_unused_pacas(void); 160 161#else /* CONFIG_PPC64 */ 162 163static inline void allocate_pacas(void) { }; 164static inline void free_unused_pacas(void) { }; 165 166#endif /* CONFIG_PPC64 */ 167 168#endif /* __KERNEL__ */ 169#endif /* _ASM_POWERPC_PACA_H */ 170