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 #include <asm/pgtable.h> 17 18 /* This symbol is provided by the linker - let it fill in the paca 19 * field correctly */ 20 extern unsigned long __toc_start; 21 22 #ifdef CONFIG_PPC_BOOK3S 23 24 /* 25 * The structure which the hypervisor knows about - this structure 26 * should not cross a page boundary. The vpa_init/register_vpa call 27 * is now known to fail if the lppaca structure crosses a page 28 * boundary. The lppaca is also used on legacy iSeries and POWER5 29 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily 30 * change since the hypervisor knows its layout, so a 1kB alignment 31 * will suffice to ensure that it doesn't cross a page boundary. 32 */ 33 struct lppaca lppaca[] = { 34 [0 ... (NR_CPUS-1)] = { 35 .desc = 0xd397d781, /* "LpPa" */ 36 .size = sizeof(struct lppaca), 37 .dyn_proc_status = 2, 38 .decr_val = 0x00ff0000, 39 .fpregs_in_use = 1, 40 .end_of_quantum = 0xfffffffffffffffful, 41 .slb_count = 64, 42 .vmxregs_in_use = 0, 43 .page_ins = 0, 44 }, 45 }; 46 47 #endif /* CONFIG_PPC_BOOK3S */ 48 49 #ifdef CONFIG_PPC_STD_MMU_64 50 51 /* 52 * 3 persistent SLBs are registered here. The buffer will be zero 53 * initially, hence will all be invaild until we actually write them. 54 */ 55 struct slb_shadow slb_shadow[] __cacheline_aligned = { 56 [0 ... (NR_CPUS-1)] = { 57 .persistent = SLB_NUM_BOLTED, 58 .buffer_length = sizeof(struct slb_shadow), 59 }, 60 }; 61 62 #endif /* CONFIG_PPC_STD_MMU_64 */ 63 64 /* The Paca is an array with one entry per processor. Each contains an 65 * lppaca, which contains the information shared between the 66 * hypervisor and Linux. 67 * On systems with hardware multi-threading, there are two threads 68 * per processor. The Paca array must contain an entry for each thread. 69 * The VPD Areas will give a max logical processors = 2 * max physical 70 * processors. The processor VPD array needs one entry per physical 71 * processor (not thread). 72 */ 73 struct paca_struct paca[NR_CPUS]; 74 EXPORT_SYMBOL(paca); 75 76 void __init initialise_pacas(void) 77 { 78 int cpu; 79 80 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB 81 * of the TOC can be addressed using a single machine instruction. 82 */ 83 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; 84 85 /* Can't use for_each_*_cpu, as they aren't functional yet */ 86 for (cpu = 0; cpu < NR_CPUS; cpu++) { 87 struct paca_struct *new_paca = &paca[cpu]; 88 89 #ifdef CONFIG_PPC_BOOK3S 90 new_paca->lppaca_ptr = &lppaca[cpu]; 91 #else 92 new_paca->kernel_pgd = swapper_pg_dir; 93 #endif 94 new_paca->lock_token = 0x8000; 95 new_paca->paca_index = cpu; 96 new_paca->kernel_toc = kernel_toc; 97 new_paca->kernelbase = (unsigned long) _stext; 98 new_paca->kernel_msr = MSR_KERNEL; 99 new_paca->hw_cpu_id = 0xffff; 100 new_paca->__current = &init_task; 101 #ifdef CONFIG_PPC_STD_MMU_64 102 new_paca->slb_shadow_ptr = &slb_shadow[cpu]; 103 #endif /* CONFIG_PPC_STD_MMU_64 */ 104 105 } 106 } 107