| /* |
| * c 2001 PPC 64 Team, IBM Corp |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/threads.h> |
| #include <linux/module.h> |
| #include <linux/memblock.h> |
| |
| #include <asm/firmware.h> |
| #include <asm/lppaca.h> |
| #include <asm/paca.h> |
| #include <asm/sections.h> |
| #include <asm/pgtable.h> |
| #include <asm/iseries/lpar_map.h> |
| #include <asm/iseries/hv_types.h> |
| #include <asm/kexec.h> |
| |
| /* This symbol is provided by the linker - let it fill in the paca |
| * field correctly */ |
| extern unsigned long __toc_start; |
| |
| #ifdef CONFIG_PPC_BOOK3S |
| |
| /* |
| * The structure which the hypervisor knows about - this structure |
| * should not cross a page boundary. The vpa_init/register_vpa call |
| * is now known to fail if the lppaca structure crosses a page |
| * boundary. The lppaca is also used on legacy iSeries and POWER5 |
| * pSeries boxes. The lppaca is 640 bytes long, and cannot readily |
| * change since the hypervisor knows its layout, so a 1kB alignment |
| * will suffice to ensure that it doesn't cross a page boundary. |
| */ |
| struct lppaca lppaca[] = { |
| [0 ... (NR_CPUS-1)] = { |
| .desc = 0xd397d781, /* "LpPa" */ |
| .size = sizeof(struct lppaca), |
| .dyn_proc_status = 2, |
| .decr_val = 0x00ff0000, |
| .fpregs_in_use = 1, |
| .end_of_quantum = 0xfffffffffffffffful, |
| .slb_count = 64, |
| .vmxregs_in_use = 0, |
| .page_ins = 0, |
| }, |
| }; |
| |
| #endif /* CONFIG_PPC_BOOK3S */ |
| |
| #ifdef CONFIG_PPC_STD_MMU_64 |
| |
| /* |
| * 3 persistent SLBs are registered here. The buffer will be zero |
| * initially, hence will all be invaild until we actually write them. |
| */ |
| struct slb_shadow slb_shadow[] __cacheline_aligned = { |
| [0 ... (NR_CPUS-1)] = { |
| .persistent = SLB_NUM_BOLTED, |
| .buffer_length = sizeof(struct slb_shadow), |
| }, |
| }; |
| |
| #endif /* CONFIG_PPC_STD_MMU_64 */ |
| |
| /* The Paca is an array with one entry per processor. Each contains an |
| * lppaca, which contains the information shared between the |
| * hypervisor and Linux. |
| * On systems with hardware multi-threading, there are two threads |
| * per processor. The Paca array must contain an entry for each thread. |
| * The VPD Areas will give a max logical processors = 2 * max physical |
| * processors. The processor VPD array needs one entry per physical |
| * processor (not thread). |
| */ |
| struct paca_struct *paca; |
| EXPORT_SYMBOL(paca); |
| |
| struct paca_struct boot_paca; |
| |
| void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
| { |
| /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB |
| * of the TOC can be addressed using a single machine instruction. |
| */ |
| unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
| |
| #ifdef CONFIG_PPC_BOOK3S |
| new_paca->lppaca_ptr = &lppaca[cpu]; |
| #else |
| new_paca->kernel_pgd = swapper_pg_dir; |
| #endif |
| new_paca->lock_token = 0x8000; |
| new_paca->paca_index = cpu; |
| new_paca->kernel_toc = kernel_toc; |
| new_paca->kernelbase = (unsigned long) _stext; |
| new_paca->kernel_msr = MSR_KERNEL; |
| new_paca->hw_cpu_id = 0xffff; |
| new_paca->kexec_state = KEXEC_STATE_NONE; |
| new_paca->__current = &init_task; |
| #ifdef CONFIG_PPC_STD_MMU_64 |
| new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
| #endif /* CONFIG_PPC_STD_MMU_64 */ |
| } |
| |
| /* Put the paca pointer into r13 and SPRG_PACA */ |
| void setup_paca(struct paca_struct *new_paca) |
| { |
| local_paca = new_paca; |
| mtspr(SPRN_SPRG_PACA, local_paca); |
| #ifdef CONFIG_PPC_BOOK3E |
| mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
| #endif |
| } |
| |
| static int __initdata paca_size; |
| |
| void __init allocate_pacas(void) |
| { |
| int nr_cpus, cpu, limit; |
| |
| /* |
| * We can't take SLB misses on the paca, and we want to access them |
| * in real mode, so allocate them within the RMA and also within |
| * the first segment. On iSeries they must be within the area mapped |
| * by the HV, which is HvPagesToMap * HVPAGESIZE bytes. |
| */ |
| limit = min(0x10000000ULL, memblock.rmo_size); |
| if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| limit = min(limit, HvPagesToMap * HVPAGESIZE); |
| |
| nr_cpus = NR_CPUS; |
| /* On iSeries we know we can never have more than 64 cpus */ |
| if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| nr_cpus = min(64, nr_cpus); |
| |
| paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus); |
| |
| paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); |
| memset(paca, 0, paca_size); |
| |
| printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", |
| paca_size, nr_cpus, paca); |
| |
| /* Can't use for_each_*_cpu, as they aren't functional yet */ |
| for (cpu = 0; cpu < nr_cpus; cpu++) |
| initialise_paca(&paca[cpu], cpu); |
| } |
| |
| void __init free_unused_pacas(void) |
| { |
| int new_size; |
| |
| new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus()); |
| |
| if (new_size >= paca_size) |
| return; |
| |
| memblock_free(__pa(paca) + new_size, paca_size - new_size); |
| |
| printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", |
| paca_size - new_size); |
| |
| paca_size = new_size; |
| } |