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 #ifdef CONFIG_PPC_BOOK3S 22 23 /* 24 * The structure which the hypervisor knows about - this structure 25 * should not cross a page boundary. The vpa_init/register_vpa call 26 * is now known to fail if the lppaca structure crosses a page 27 * boundary. The lppaca is also used on legacy iSeries and POWER5 28 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily 29 * change since the hypervisor knows its layout, so a 1kB alignment 30 * will suffice to ensure that it doesn't cross a page boundary. 31 */ 32 struct lppaca lppaca[] = { 33 [0 ... (NR_CPUS-1)] = { 34 .desc = 0xd397d781, /* "LpPa" */ 35 .size = sizeof(struct lppaca), 36 .dyn_proc_status = 2, 37 .decr_val = 0x00ff0000, 38 .fpregs_in_use = 1, 39 .end_of_quantum = 0xfffffffffffffffful, 40 .slb_count = 64, 41 .vmxregs_in_use = 0, 42 .page_ins = 0, 43 }, 44 }; 45 46 #endif /* CONFIG_PPC_BOOK3S */ 47 48 #ifdef CONFIG_PPC_STD_MMU_64 49 50 /* 51 * 3 persistent SLBs are registered here. The buffer will be zero 52 * initially, hence will all be invaild until we actually write them. 53 */ 54 struct slb_shadow slb_shadow[] __cacheline_aligned = { 55 [0 ... (NR_CPUS-1)] = { 56 .persistent = SLB_NUM_BOLTED, 57 .buffer_length = sizeof(struct slb_shadow), 58 }, 59 }; 60 61 #endif /* CONFIG_PPC_STD_MMU_64 */ 62 63 /* The Paca is an array with one entry per processor. Each contains an 64 * lppaca, which contains the information shared between the 65 * hypervisor and Linux. 66 * On systems with hardware multi-threading, there are two threads 67 * per processor. The Paca array must contain an entry for each thread. 68 * The VPD Areas will give a max logical processors = 2 * max physical 69 * processors. The processor VPD array needs one entry per physical 70 * processor (not thread). 71 */ 72 struct paca_struct paca[NR_CPUS]; 73 EXPORT_SYMBOL(paca); 74 75 void __init initialise_pacas(void) 76 { 77 int cpu; 78 79 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB 80 * of the TOC can be addressed using a single machine instruction. 81 */ 82 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; 83 84 /* Can't use for_each_*_cpu, as they aren't functional yet */ 85 for (cpu = 0; cpu < NR_CPUS; cpu++) { 86 struct paca_struct *new_paca = &paca[cpu]; 87 88 #ifdef CONFIG_PPC_BOOK3S 89 new_paca->lppaca_ptr = &lppaca[cpu]; 90 #endif 91 new_paca->lock_token = 0x8000; 92 new_paca->paca_index = cpu; 93 new_paca->kernel_toc = kernel_toc; 94 new_paca->kernelbase = (unsigned long) _stext; 95 new_paca->kernel_msr = MSR_KERNEL; 96 new_paca->hw_cpu_id = 0xffff; 97 new_paca->__current = &init_task; 98 #ifdef CONFIG_PPC_STD_MMU_64 99 new_paca->slb_shadow_ptr = &slb_shadow[cpu]; 100 #endif /* CONFIG_PPC_STD_MMU_64 */ 101 102 } 103 } 104