Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * c 2001 PPC 64 Team, IBM Corp |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/threads.h> |
| 11 | #include <linux/module.h> |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/lppaca.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <asm/paca.h> |
Paul Mackerras | 549e815 | 2008-08-30 11:43:47 +1000 | [diff] [blame] | 15 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | /* This symbol is provided by the linker - let it fill in the paca |
| 18 | * field correctly */ |
| 19 | extern unsigned long __toc_start; |
| 20 | |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 21 | /* |
Stephen Rothwell | 30ff2e8 | 2008-04-10 16:43:47 +1000 | [diff] [blame] | 22 | * The structure which the hypervisor knows about - this structure |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 23 | * should not cross a page boundary. The vpa_init/register_vpa call |
| 24 | * is now known to fail if the lppaca structure crosses a page |
Stephen Rothwell | 30ff2e8 | 2008-04-10 16:43:47 +1000 | [diff] [blame] | 25 | * boundary. The lppaca is also used on legacy iSeries and POWER5 |
| 26 | * pSeries boxes. The lppaca is 640 bytes long, and cannot readily |
| 27 | * change since the hypervisor knows its layout, so a 1kB alignment |
| 28 | * will suffice to ensure that it doesn't cross a page boundary. |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 29 | */ |
| 30 | struct lppaca lppaca[] = { |
| 31 | [0 ... (NR_CPUS-1)] = { |
| 32 | .desc = 0xd397d781, /* "LpPa" */ |
| 33 | .size = sizeof(struct lppaca), |
| 34 | .dyn_proc_status = 2, |
| 35 | .decr_val = 0x00ff0000, |
| 36 | .fpregs_in_use = 1, |
| 37 | .end_of_quantum = 0xfffffffffffffffful, |
| 38 | .slb_count = 64, |
| 39 | .vmxregs_in_use = 0, |
Brian King | 4090019 | 2008-10-22 05:53:45 +0000 | [diff] [blame] | 40 | .page_ins = 0, |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 41 | }, |
| 42 | }; |
| 43 | |
Michael Neuling | 2f6093c | 2006-08-07 16:19:19 +1000 | [diff] [blame] | 44 | /* |
| 45 | * 3 persistent SLBs are registered here. The buffer will be zero |
| 46 | * initially, hence will all be invaild until we actually write them. |
| 47 | */ |
| 48 | struct slb_shadow slb_shadow[] __cacheline_aligned = { |
| 49 | [0 ... (NR_CPUS-1)] = { |
| 50 | .persistent = SLB_NUM_BOLTED, |
| 51 | .buffer_length = sizeof(struct slb_shadow), |
| 52 | }, |
| 53 | }; |
| 54 | |
David Gibson | 8882a4d | 2005-11-09 13:38:01 +1100 | [diff] [blame] | 55 | /* The Paca is an array with one entry per processor. Each contains an |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | * lppaca, which contains the information shared between the |
David Gibson | 1888e7b | 2005-11-24 16:34:45 +1100 | [diff] [blame] | 57 | * hypervisor and Linux. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * On systems with hardware multi-threading, there are two threads |
| 59 | * per processor. The Paca array must contain an entry for each thread. |
| 60 | * The VPD Areas will give a max logical processors = 2 * max physical |
| 61 | * processors. The processor VPD array needs one entry per physical |
| 62 | * processor (not thread). |
| 63 | */ |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 64 | struct paca_struct paca[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | EXPORT_SYMBOL(paca); |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 66 | |
| 67 | void __init initialise_pacas(void) |
| 68 | { |
| 69 | int cpu; |
| 70 | |
| 71 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB |
| 72 | * of the TOC can be addressed using a single machine instruction. |
| 73 | */ |
| 74 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
| 75 | |
| 76 | /* Can't use for_each_*_cpu, as they aren't functional yet */ |
| 77 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 78 | struct paca_struct *new_paca = &paca[cpu]; |
| 79 | |
| 80 | new_paca->lppaca_ptr = &lppaca[cpu]; |
| 81 | new_paca->lock_token = 0x8000; |
| 82 | new_paca->paca_index = cpu; |
| 83 | new_paca->kernel_toc = kernel_toc; |
Paul Mackerras | 549e815 | 2008-08-30 11:43:47 +1000 | [diff] [blame] | 84 | new_paca->kernelbase = (unsigned long) _stext; |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 85 | new_paca->kernel_msr = MSR_KERNEL; |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 86 | new_paca->hw_cpu_id = 0xffff; |
| 87 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
| 88 | new_paca->__current = &init_task; |
| 89 | |
| 90 | } |
| 91 | } |