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Diffstat (limited to 'include/asm-powerpc/paca.h')
| -rw-r--r-- | include/asm-powerpc/paca.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h new file mode 100644 index 00000000000..92c765c35bd --- /dev/null +++ b/include/asm-powerpc/paca.h @@ -0,0 +1,120 @@ +/* + * include/asm-powerpc/paca.h + * + * This control block defines the PACA which defines the processor + * specific data for each logical processor on the system. + * There are some pointers defined that are utilized by PLIC. + * + * C 2001 PPC 64 Team, IBM Corp + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _ASM_POWERPC_PACA_H +#define _ASM_POWERPC_PACA_H + +#include <linux/config.h> +#include <asm/types.h> +#include <asm/lppaca.h> +#include <asm/iseries/it_lp_reg_save.h> +#include <asm/mmu.h> + +register struct paca_struct *local_paca asm("r13"); +#define get_paca() local_paca + +struct task_struct; + +/* + * Defines the layout of the paca. + * + * This structure is not directly accessed by firmware or the service + * processor except for the first two pointers that point to the + * lppaca area and the ItLpRegSave area for this CPU. Both the + * lppaca and ItLpRegSave objects are currently contained within the + * PACA but they do not need to be. + */ +struct paca_struct { + /* + * Because hw_cpu_id, unlike other paca fields, is accessed + * routinely from other CPUs (from the IRQ code), we stick to + * read-only (after boot) fields in the first cacheline to + * avoid cacheline bouncing. + */ + + /* + * MAGIC: These first two pointers can't be moved - they're + * accessed by the firmware + */ + struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ + struct ItLpRegSave *reg_save_ptr; /* Pointer to LpRegSave for PLIC */ + + /* + * MAGIC: the spinlock functions in arch/ppc64/lib/locks.c + * load lock_token and paca_index with a single lwz + * instruction. They must travel together and be properly + * aligned. + */ + u16 lock_token; /* Constant 0x8000, used in locks */ + u16 paca_index; /* Logical processor number */ + + u32 default_decr; /* Default decrementer value */ + u64 kernel_toc; /* Kernel TOC address */ + u64 stab_real; /* Absolute address of segment table */ + u64 stab_addr; /* Virtual address of segment table */ + void *emergency_sp; /* pointer to emergency stack */ + s16 hw_cpu_id; /* Physical processor number */ + u8 cpu_start; /* At startup, processor spins until */ + /* this becomes non-zero. */ + + /* + * Now, starting in cacheline 2, the exception save areas + */ + /* used for most interrupts/exceptions */ + u64 exgen[10] __attribute__((aligned(0x80))); + u64 exmc[10]; /* used for machine checks */ + u64 exslb[10]; /* used for SLB/segment table misses + * on the linear mapping */ +#ifdef CONFIG_PPC_64K_PAGES + pgd_t *pgdir; +#endif /* CONFIG_PPC_64K_PAGES */ + + mm_context_t context; + u16 slb_cache[SLB_CACHE_ENTRIES]; + u16 slb_cache_ptr; + + /* + * then miscellaneous read-write fields + */ + struct task_struct *__current; /* Pointer to current */ + u64 kstack; /* Saved Kernel stack addr */ + u64 stab_rr; /* stab/slb round-robin counter */ + u64 next_jiffy_update_tb; /* TB value for next jiffy update */ + u64 saved_r1; /* r1 save for RTAS calls */ + u64 saved_msr; /* MSR saved here by enter_rtas */ + u8 proc_enabled; /* irq soft-enable flag */ + + /* not yet used */ + u64 exdsi[8]; /* used for linear mapping hash table misses */ + + /* + * iSeries structure which the hypervisor knows about - + * this structure should not cross a page boundary. + * The vpa_init/register_vpa call is now known to fail if the + * lppaca structure crosses a page boundary. + * The lppaca is also used on POWER5 pSeries boxes. + * The lppaca is 640 bytes long, and cannot readily change + * since the hypervisor knows its layout, so a 1kB + * alignment will suffice to ensure that it doesn't + * cross a page boundary. + */ + struct lppaca lppaca __attribute__((__aligned__(0x400))); +#ifdef CONFIG_PPC_ISERIES + struct ItLpRegSave reg_save; +#endif +}; + +extern struct paca_struct paca[]; + +#endif /* _ASM_POWERPC_PACA_H */ |