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/arch/powerpc/include/asm/paca.h

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C Header | 183 lines | 109 code | 22 blank | 52 comment | 1 complexity | 7edc56e409a175afd282076e87e78449 MD5 | raw file
  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[11] __attribute__((aligned(0x80)));
 97	u64 exmc[11];		/* used for machine checks */
 98	u64 exslb[11];		/* 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	u16 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
140#ifdef CONFIG_PPC_POWERNV
141	/* Pointer to OPAL machine check event structure set by the
142	 * early exception handler for use by high level C handler
143	 */
144	struct opal_machine_check_event *opal_mc_evt;
145#endif
146
147	/* Stuff for accurate time accounting */
148	u64 user_time;			/* accumulated usermode TB ticks */
149	u64 system_time;		/* accumulated system TB ticks */
150	u64 user_time_scaled;		/* accumulated usermode SPURR ticks */
151	u64 starttime;			/* TB value snapshot */
152	u64 starttime_user;		/* TB value on exit to usermode */
153	u64 startspurr;			/* SPURR value snapshot */
154	u64 utime_sspurr;		/* ->user_time when ->startspurr set */
155	u64 stolen_time;		/* TB ticks taken by hypervisor */
156	u64 dtl_ridx;			/* read index in dispatch log */
157	struct dtl_entry *dtl_curr;	/* pointer corresponding to dtl_ridx */
158
159#ifdef CONFIG_KVM_BOOK3S_HANDLER
160#ifdef CONFIG_KVM_BOOK3S_PR
161	/* We use this to store guest state in */
162	struct kvmppc_book3s_shadow_vcpu shadow_vcpu;
163#endif
164	struct kvmppc_host_state kvm_hstate;
165#endif
166};
167
168extern struct paca_struct *paca;
169extern __initdata struct paca_struct boot_paca;
170extern void initialise_paca(struct paca_struct *new_paca, int cpu);
171extern void setup_paca(struct paca_struct *new_paca);
172extern void allocate_pacas(void);
173extern void free_unused_pacas(void);
174
175#else /* CONFIG_PPC64 */
176
177static inline void allocate_pacas(void) { };
178static inline void free_unused_pacas(void) { };
179
180#endif /* CONFIG_PPC64 */
181
182#endif /* __KERNEL__ */
183#endif /* _ASM_POWERPC_PACA_H */