269 lines
7.0 KiB
C
269 lines
7.0 KiB
C
/*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/smp.h>
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#include <linux/export.h>
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#include <linux/memblock.h>
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#include <linux/sched/task.h>
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#include <asm/lppaca.h>
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#include <asm/paca.h>
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#include <asm/sections.h>
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#include <asm/pgtable.h>
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#include <asm/kexec.h>
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#ifdef CONFIG_PPC_BOOK3S
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/*
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* The structure which the hypervisor knows about - this structure
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* should not cross a page boundary. The vpa_init/register_vpa call
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* is now known to fail if the lppaca structure crosses a page
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* boundary. The lppaca is also used on POWER5 pSeries boxes.
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* The lppaca is 640 bytes long, and cannot readily
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* change since the hypervisor knows its layout, so a 1kB alignment
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* will suffice to ensure that it doesn't cross a page boundary.
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*/
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struct lppaca lppaca[] = {
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[0 ... (NR_LPPACAS-1)] = {
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.desc = cpu_to_be32(0xd397d781), /* "LpPa" */
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.size = cpu_to_be16(sizeof(struct lppaca)),
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.fpregs_in_use = 1,
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.slb_count = cpu_to_be16(64),
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.vmxregs_in_use = 0,
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.page_ins = 0,
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},
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};
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static struct lppaca *extra_lppacas;
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static long __initdata lppaca_size;
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static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
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{
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if (nr_cpus <= NR_LPPACAS)
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return;
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lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
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(nr_cpus - NR_LPPACAS));
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extra_lppacas = __va(memblock_alloc_base(lppaca_size,
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PAGE_SIZE, limit));
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}
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static struct lppaca * __init new_lppaca(int cpu)
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{
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struct lppaca *lp;
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if (cpu < NR_LPPACAS)
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return &lppaca[cpu];
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lp = extra_lppacas + (cpu - NR_LPPACAS);
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*lp = lppaca[0];
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return lp;
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}
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static void __init free_lppacas(void)
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{
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long new_size = 0, nr;
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if (!lppaca_size)
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return;
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nr = num_possible_cpus() - NR_LPPACAS;
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if (nr > 0)
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new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
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if (new_size >= lppaca_size)
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return;
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memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
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lppaca_size = new_size;
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}
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#else
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static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
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static inline void free_lppacas(void) { }
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#endif /* CONFIG_PPC_BOOK3S */
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#ifdef CONFIG_PPC_STD_MMU_64
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/*
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* 3 persistent SLBs are registered here. The buffer will be zero
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* initially, hence will all be invaild until we actually write them.
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*
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* If you make the number of persistent SLB entries dynamic, please also
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* update PR KVM to flush and restore them accordingly.
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*/
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static struct slb_shadow *slb_shadow;
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static void __init allocate_slb_shadows(int nr_cpus, int limit)
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{
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int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
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slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
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memset(slb_shadow, 0, size);
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}
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static struct slb_shadow * __init init_slb_shadow(int cpu)
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{
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struct slb_shadow *s = &slb_shadow[cpu];
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/*
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* When we come through here to initialise boot_paca, the slb_shadow
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* buffers are not allocated yet. That's OK, we'll get one later in
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* boot, but make sure we don't corrupt memory at 0.
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*/
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if (!slb_shadow)
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return NULL;
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s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
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s->buffer_length = cpu_to_be32(sizeof(*s));
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return s;
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}
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#else /* CONFIG_PPC_STD_MMU_64 */
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static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
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#endif /* CONFIG_PPC_STD_MMU_64 */
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/* The Paca is an array with one entry per processor. Each contains an
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* lppaca, which contains the information shared between the
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* hypervisor and Linux.
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* On systems with hardware multi-threading, there are two threads
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* per processor. The Paca array must contain an entry for each thread.
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* The VPD Areas will give a max logical processors = 2 * max physical
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* processors. The processor VPD array needs one entry per physical
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* processor (not thread).
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*/
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struct paca_struct *paca;
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EXPORT_SYMBOL(paca);
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void __init initialise_paca(struct paca_struct *new_paca, int cpu)
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{
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#ifdef CONFIG_PPC_BOOK3S
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new_paca->lppaca_ptr = new_lppaca(cpu);
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#else
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new_paca->kernel_pgd = swapper_pg_dir;
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#endif
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new_paca->lock_token = 0x8000;
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new_paca->paca_index = cpu;
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new_paca->kernel_toc = kernel_toc_addr();
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new_paca->kernelbase = (unsigned long) _stext;
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/* Only set MSR:IR/DR when MMU is initialized */
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new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
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new_paca->hw_cpu_id = 0xffff;
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new_paca->kexec_state = KEXEC_STATE_NONE;
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new_paca->__current = &init_task;
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new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
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#ifdef CONFIG_PPC_STD_MMU_64
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new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
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#endif /* CONFIG_PPC_STD_MMU_64 */
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#ifdef CONFIG_PPC_BOOK3E
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/* For now -- if we have threads this will be adjusted later */
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new_paca->tcd_ptr = &new_paca->tcd;
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#endif
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}
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/* Put the paca pointer into r13 and SPRG_PACA */
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void setup_paca(struct paca_struct *new_paca)
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{
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/* Setup r13 */
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local_paca = new_paca;
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#ifdef CONFIG_PPC_BOOK3E
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/* On Book3E, initialize the TLB miss exception frames */
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mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
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#else
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/* In HV mode, we setup both HPACA and PACA to avoid problems
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* if we do a GET_PACA() before the feature fixups have been
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* applied
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*/
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if (early_cpu_has_feature(CPU_FTR_HVMODE))
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mtspr(SPRN_SPRG_HPACA, local_paca);
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#endif
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mtspr(SPRN_SPRG_PACA, local_paca);
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}
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static int __initdata paca_size;
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void __init allocate_pacas(void)
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{
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u64 limit;
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int cpu;
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limit = ppc64_rma_size;
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* We can't take SLB misses on the paca, and we want to access them
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* in real mode, so allocate them within the RMA and also within
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* the first segment.
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*/
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limit = min(0x10000000ULL, limit);
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#endif
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paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
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paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
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memset(paca, 0, paca_size);
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printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
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paca_size, nr_cpu_ids, paca);
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allocate_lppacas(nr_cpu_ids, limit);
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allocate_slb_shadows(nr_cpu_ids, limit);
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/* Can't use for_each_*_cpu, as they aren't functional yet */
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for (cpu = 0; cpu < nr_cpu_ids; cpu++)
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initialise_paca(&paca[cpu], cpu);
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}
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void __init free_unused_pacas(void)
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{
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int new_size;
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new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
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if (new_size >= paca_size)
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return;
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memblock_free(__pa(paca) + new_size, paca_size - new_size);
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printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
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paca_size - new_size);
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paca_size = new_size;
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free_lppacas();
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}
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void copy_mm_to_paca(struct mm_struct *mm)
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{
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#ifdef CONFIG_PPC_BOOK3S
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mm_context_t *context = &mm->context;
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get_paca()->mm_ctx_id = context->id;
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#ifdef CONFIG_PPC_MM_SLICES
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VM_BUG_ON(!mm->context.addr_limit);
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get_paca()->addr_limit = mm->context.addr_limit;
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get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
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memcpy(&get_paca()->mm_ctx_high_slices_psize,
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&context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm));
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#else /* CONFIG_PPC_MM_SLICES */
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get_paca()->mm_ctx_user_psize = context->user_psize;
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get_paca()->mm_ctx_sllp = context->sllp;
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#endif
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#else /* CONFIG_PPC_BOOK3S */
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return;
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#endif
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}
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