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 #include <asm/sections.h> 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 21 /* 22 * The structure which the hypervisor knows about - this structure 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 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. 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, 40 .page_ins = 0, 41 }, 42 }; 43 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 55 /* The Paca is an array with one entry per processor. Each contains an 56 * lppaca, which contains the information shared between the 57 * hypervisor and Linux. 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 */ 64 struct paca_struct paca[NR_CPUS]; 65 EXPORT_SYMBOL(paca); 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; 84 new_paca->kernelbase = (unsigned long) _stext; 85 new_paca->kernel_msr = MSR_KERNEL; 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 } 92