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 10 #include <linux/threads.h> 11 #include <linux/module.h> 12 13 #include <asm/lppaca.h> 14 #include <asm/paca.h> 15 16 /* This symbol is provided by the linker - let it fill in the paca 17 * field correctly */ 18 extern unsigned long __toc_start; 19 20 /* 21 * The structure which the hypervisor knows about - this structure 22 * should not cross a page boundary. The vpa_init/register_vpa call 23 * is now known to fail if the lppaca structure crosses a page 24 * boundary. The lppaca is also used on legacy iSeries and POWER5 25 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily 26 * change since the hypervisor knows its layout, so a 1kB alignment 27 * will suffice to ensure that it doesn't cross a page boundary. 28 */ 29 struct lppaca lppaca[] = { 30 [0 ... (NR_CPUS-1)] = { 31 .desc = 0xd397d781, /* "LpPa" */ 32 .size = sizeof(struct lppaca), 33 .dyn_proc_status = 2, 34 .decr_val = 0x00ff0000, 35 .fpregs_in_use = 1, 36 .end_of_quantum = 0xfffffffffffffffful, 37 .slb_count = 64, 38 .vmxregs_in_use = 0, 39 }, 40 }; 41 42 /* 43 * 3 persistent SLBs are registered here. The buffer will be zero 44 * initially, hence will all be invaild until we actually write them. 45 */ 46 struct slb_shadow slb_shadow[] __cacheline_aligned = { 47 [0 ... (NR_CPUS-1)] = { 48 .persistent = SLB_NUM_BOLTED, 49 .buffer_length = sizeof(struct slb_shadow), 50 }, 51 }; 52 53 /* The Paca is an array with one entry per processor. Each contains an 54 * lppaca, which contains the information shared between the 55 * hypervisor and Linux. 56 * On systems with hardware multi-threading, there are two threads 57 * per processor. The Paca array must contain an entry for each thread. 58 * The VPD Areas will give a max logical processors = 2 * max physical 59 * processors. The processor VPD array needs one entry per physical 60 * processor (not thread). 61 */ 62 struct paca_struct paca[NR_CPUS]; 63 EXPORT_SYMBOL(paca); 64 65 void __init initialise_pacas(void) 66 { 67 int cpu; 68 69 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB 70 * of the TOC can be addressed using a single machine instruction. 71 */ 72 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; 73 74 /* Can't use for_each_*_cpu, as they aren't functional yet */ 75 for (cpu = 0; cpu < NR_CPUS; cpu++) { 76 struct paca_struct *new_paca = &paca[cpu]; 77 78 new_paca->lppaca_ptr = &lppaca[cpu]; 79 new_paca->lock_token = 0x8000; 80 new_paca->paca_index = cpu; 81 new_paca->kernel_toc = kernel_toc; 82 new_paca->hw_cpu_id = 0xffff; 83 new_paca->slb_shadow_ptr = &slb_shadow[cpu]; 84 new_paca->__current = &init_task; 85 86 } 87 } 88