Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 2 | * include/asm-powerpc/paca.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 4 | * This control block defines the PACA which defines the processor |
| 5 | * specific data for each logical processor on the system. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * There are some pointers defined that are utilized by PLIC. |
| 7 | * |
| 8 | * C 2001 PPC 64 Team, IBM Corp |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 14 | */ |
| 15 | #ifndef _ASM_POWERPC_PACA_H |
| 16 | #define _ASM_POWERPC_PACA_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 17 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <linux/config.h> |
| 20 | #include <asm/types.h> |
| 21 | #include <asm/lppaca.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/mmu.h> |
| 23 | |
| 24 | register struct paca_struct *local_paca asm("r13"); |
| 25 | #define get_paca() local_paca |
| 26 | |
| 27 | struct task_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | /* |
| 30 | * Defines the layout of the paca. |
| 31 | * |
| 32 | * This structure is not directly accessed by firmware or the service |
| 33 | * processor except for the first two pointers that point to the |
David Gibson | 1888e7b | 2005-11-24 16:34:45 +1100 | [diff] [blame] | 34 | * lppaca area and the ItLpRegSave area for this CPU. The lppaca |
| 35 | * object is currently contained within the PACA but it doesn't need |
| 36 | * to be. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | */ |
| 38 | struct paca_struct { |
| 39 | /* |
| 40 | * Because hw_cpu_id, unlike other paca fields, is accessed |
| 41 | * routinely from other CPUs (from the IRQ code), we stick to |
| 42 | * read-only (after boot) fields in the first cacheline to |
| 43 | * avoid cacheline bouncing. |
| 44 | */ |
| 45 | |
| 46 | /* |
| 47 | * MAGIC: These first two pointers can't be moved - they're |
| 48 | * accessed by the firmware |
| 49 | */ |
| 50 | struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ |
David Gibson | 1888e7b | 2005-11-24 16:34:45 +1100 | [diff] [blame] | 51 | #ifdef CONFIG_PPC_ISERIES |
| 52 | void *reg_save_ptr; /* Pointer to LpRegSave for PLIC */ |
| 53 | #endif /* CONFIG_PPC_ISERIES */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | /* |
| 56 | * MAGIC: the spinlock functions in arch/ppc64/lib/locks.c |
| 57 | * load lock_token and paca_index with a single lwz |
| 58 | * instruction. They must travel together and be properly |
| 59 | * aligned. |
| 60 | */ |
| 61 | u16 lock_token; /* Constant 0x8000, used in locks */ |
| 62 | u16 paca_index; /* Logical processor number */ |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | u64 kernel_toc; /* Kernel TOC address */ |
| 65 | u64 stab_real; /* Absolute address of segment table */ |
| 66 | u64 stab_addr; /* Virtual address of segment table */ |
| 67 | void *emergency_sp; /* pointer to emergency stack */ |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame^] | 68 | u64 data_offset; /* per cpu data offset */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | s16 hw_cpu_id; /* Physical processor number */ |
| 70 | u8 cpu_start; /* At startup, processor spins until */ |
| 71 | /* this becomes non-zero. */ |
| 72 | |
| 73 | /* |
| 74 | * Now, starting in cacheline 2, the exception save areas |
| 75 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 76 | /* used for most interrupts/exceptions */ |
| 77 | u64 exgen[10] __attribute__((aligned(0x80))); |
| 78 | u64 exmc[10]; /* used for machine checks */ |
| 79 | u64 exslb[10]; /* used for SLB/segment table misses |
| 80 | * on the linear mapping */ |
| 81 | #ifdef CONFIG_PPC_64K_PAGES |
| 82 | pgd_t *pgdir; |
| 83 | #endif /* CONFIG_PPC_64K_PAGES */ |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | mm_context_t context; |
| 86 | u16 slb_cache[SLB_CACHE_ENTRIES]; |
| 87 | u16 slb_cache_ptr; |
| 88 | |
| 89 | /* |
| 90 | * then miscellaneous read-write fields |
| 91 | */ |
| 92 | struct task_struct *__current; /* Pointer to current */ |
| 93 | u64 kstack; /* Saved Kernel stack addr */ |
| 94 | u64 stab_rr; /* stab/slb round-robin counter */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | u64 saved_r1; /* r1 save for RTAS calls */ |
| 96 | u64 saved_msr; /* MSR saved here by enter_rtas */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | u8 proc_enabled; /* irq soft-enable flag */ |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | /* |
| 100 | * iSeries structure which the hypervisor knows about - |
| 101 | * this structure should not cross a page boundary. |
| 102 | * The vpa_init/register_vpa call is now known to fail if the |
| 103 | * lppaca structure crosses a page boundary. |
| 104 | * The lppaca is also used on POWER5 pSeries boxes. |
| 105 | * The lppaca is 640 bytes long, and cannot readily change |
| 106 | * since the hypervisor knows its layout, so a 1kB |
| 107 | * alignment will suffice to ensure that it doesn't |
| 108 | * cross a page boundary. |
| 109 | */ |
| 110 | struct lppaca lppaca __attribute__((__aligned__(0x400))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | extern struct paca_struct paca[]; |
| 114 | |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 115 | #endif /* __KERNEL__ */ |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 116 | #endif /* _ASM_POWERPC_PACA_H */ |