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-rw-r--r--arch/powerpc/mm/hash_utils_64.c775
1 files changed, 775 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
new file mode 100644
index 00000000000..706e8a63ced
--- /dev/null
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -0,0 +1,775 @@
+/*
+ * PowerPC64 port by Mike Corrigan and Dave Engebretsen
+ * {mikejc|engebret}@us.ibm.com
+ *
+ * Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
+ *
+ * SMP scalability work:
+ * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
+ *
+ * Module name: htab.c
+ *
+ * Description:
+ * PowerPC Hashed Page Table functions
+ *
+ * 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.
+ */
+
+#undef DEBUG
+#undef DEBUG_LOW
+
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/sysctl.h>
+#include <linux/ctype.h>
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+#include <asm/page.h>
+#include <asm/types.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/machdep.h>
+#include <asm/lmb.h>
+#include <asm/abs_addr.h>
+#include <asm/tlbflush.h>
+#include <asm/io.h>
+#include <asm/eeh.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+#include <asm/cputable.h>
+#include <asm/abs_addr.h>
+#include <asm/sections.h>
+
+#ifdef DEBUG
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+#ifdef DEBUG_LOW
+#define DBG_LOW(fmt...) udbg_printf(fmt)
+#else
+#define DBG_LOW(fmt...)
+#endif
+
+#define KB (1024)
+#define MB (1024*KB)
+
+/*
+ * Note: pte --> Linux PTE
+ * HPTE --> PowerPC Hashed Page Table Entry
+ *
+ * Execution context:
+ * htab_initialize is called with the MMU off (of course), but
+ * the kernel has been copied down to zero so it can directly
+ * reference global data. At this point it is very difficult
+ * to print debug info.
+ *
+ */
+
+#ifdef CONFIG_U3_DART
+extern unsigned long dart_tablebase;
+#endif /* CONFIG_U3_DART */
+
+static unsigned long _SDR1;
+struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
+
+hpte_t *htab_address;
+unsigned long htab_hash_mask;
+int mmu_linear_psize = MMU_PAGE_4K;
+int mmu_virtual_psize = MMU_PAGE_4K;
+#ifdef CONFIG_HUGETLB_PAGE
+int mmu_huge_psize = MMU_PAGE_16M;
+unsigned int HPAGE_SHIFT;
+#endif
+
+/* There are definitions of page sizes arrays to be used when none
+ * is provided by the firmware.
+ */
+
+/* Pre-POWER4 CPUs (4k pages only)
+ */
+struct mmu_psize_def mmu_psize_defaults_old[] = {
+ [MMU_PAGE_4K] = {
+ .shift = 12,
+ .sllp = 0,
+ .penc = 0,
+ .avpnm = 0,
+ .tlbiel = 0,
+ },
+};
+
+/* POWER4, GPUL, POWER5
+ *
+ * Support for 16Mb large pages
+ */
+struct mmu_psize_def mmu_psize_defaults_gp[] = {
+ [MMU_PAGE_4K] = {
+ .shift = 12,
+ .sllp = 0,
+ .penc = 0,
+ .avpnm = 0,
+ .tlbiel = 1,
+ },
+ [MMU_PAGE_16M] = {
+ .shift = 24,
+ .sllp = SLB_VSID_L,
+ .penc = 0,
+ .avpnm = 0x1UL,
+ .tlbiel = 0,
+ },
+};
+
+
+int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
+ unsigned long pstart, unsigned long mode, int psize)
+{
+ unsigned long vaddr, paddr;
+ unsigned int step, shift;
+ unsigned long tmp_mode;
+ int ret = 0;
+
+ shift = mmu_psize_defs[psize].shift;
+ step = 1 << shift;
+
+ for (vaddr = vstart, paddr = pstart; vaddr < vend;
+ vaddr += step, paddr += step) {
+ unsigned long vpn, hash, hpteg;
+ unsigned long vsid = get_kernel_vsid(vaddr);
+ unsigned long va = (vsid << 28) | (vaddr & 0x0fffffff);
+
+ vpn = va >> shift;
+ tmp_mode = mode;
+
+ /* Make non-kernel text non-executable */
+ if (!in_kernel_text(vaddr))
+ tmp_mode = mode | HPTE_R_N;
+
+ hash = hpt_hash(va, shift);
+ hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
+
+ /* The crap below can be cleaned once ppd_md.probe() can
+ * set up the hash callbacks, thus we can just used the
+ * normal insert callback here.
+ */
+#ifdef CONFIG_PPC_ISERIES
+ if (_machine == PLATFORM_ISERIES_LPAR)
+ ret = iSeries_hpte_insert(hpteg, va,
+ virt_to_abs(paddr),
+ tmp_mode,
+ HPTE_V_BOLTED,
+ psize);
+ else
+#endif
+#ifdef CONFIG_PPC_PSERIES
+ if (_machine & PLATFORM_LPAR)
+ ret = pSeries_lpar_hpte_insert(hpteg, va,
+ virt_to_abs(paddr),
+ tmp_mode,
+ HPTE_V_BOLTED,
+ psize);
+ else
+#endif
+#ifdef CONFIG_PPC_MULTIPLATFORM
+ ret = native_hpte_insert(hpteg, va,
+ virt_to_abs(paddr),
+ tmp_mode, HPTE_V_BOLTED,
+ psize);
+#endif
+ if (ret < 0)
+ break;
+ }
+ return ret < 0 ? ret : 0;
+}
+
+static int __init htab_dt_scan_page_sizes(unsigned long node,
+ const char *uname, int depth,
+ void *data)
+{
+ char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+ u32 *prop;
+ unsigned long size = 0;
+
+ /* We are scanning "cpu" nodes only */
+ if (type == NULL || strcmp(type, "cpu") != 0)
+ return 0;
+
+ prop = (u32 *)of_get_flat_dt_prop(node,
+ "ibm,segment-page-sizes", &size);
+ if (prop != NULL) {
+ DBG("Page sizes from device-tree:\n");
+ size /= 4;
+ cur_cpu_spec->cpu_features &= ~(CPU_FTR_16M_PAGE);
+ while(size > 0) {
+ unsigned int shift = prop[0];
+ unsigned int slbenc = prop[1];
+ unsigned int lpnum = prop[2];
+ unsigned int lpenc = 0;
+ struct mmu_psize_def *def;
+ int idx = -1;
+
+ size -= 3; prop += 3;
+ while(size > 0 && lpnum) {
+ if (prop[0] == shift)
+ lpenc = prop[1];
+ prop += 2; size -= 2;
+ lpnum--;
+ }
+ switch(shift) {
+ case 0xc:
+ idx = MMU_PAGE_4K;
+ break;
+ case 0x10:
+ idx = MMU_PAGE_64K;
+ break;
+ case 0x14:
+ idx = MMU_PAGE_1M;
+ break;
+ case 0x18:
+ idx = MMU_PAGE_16M;
+ cur_cpu_spec->cpu_features |= CPU_FTR_16M_PAGE;
+ break;
+ case 0x22:
+ idx = MMU_PAGE_16G;
+ break;
+ }
+ if (idx < 0)
+ continue;
+ def = &mmu_psize_defs[idx];
+ def->shift = shift;
+ if (shift <= 23)
+ def->avpnm = 0;
+ else
+ def->avpnm = (1 << (shift - 23)) - 1;
+ def->sllp = slbenc;
+ def->penc = lpenc;
+ /* We don't know for sure what's up with tlbiel, so
+ * for now we only set it for 4K and 64K pages
+ */
+ if (idx == MMU_PAGE_4K || idx == MMU_PAGE_64K)
+ def->tlbiel = 1;
+ else
+ def->tlbiel = 0;
+
+ DBG(" %d: shift=%02x, sllp=%04x, avpnm=%08x, "
+ "tlbiel=%d, penc=%d\n",
+ idx, shift, def->sllp, def->avpnm, def->tlbiel,
+ def->penc);
+ }
+ return 1;
+ }
+ return 0;
+}
+
+
+static void __init htab_init_page_sizes(void)
+{
+ int rc;
+
+ /* Default to 4K pages only */
+ memcpy(mmu_psize_defs, mmu_psize_defaults_old,
+ sizeof(mmu_psize_defaults_old));
+
+ /*
+ * Try to find the available page sizes in the device-tree
+ */
+ rc = of_scan_flat_dt(htab_dt_scan_page_sizes, NULL);
+ if (rc != 0) /* Found */
+ goto found;
+
+ /*
+ * Not in the device-tree, let's fallback on known size
+ * list for 16M capable GP & GR
+ */
+ if ((_machine != PLATFORM_ISERIES_LPAR) &&
+ cpu_has_feature(CPU_FTR_16M_PAGE))
+ memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
+ sizeof(mmu_psize_defaults_gp));
+ found:
+ /*
+ * Pick a size for the linear mapping. Currently, we only support
+ * 16M, 1M and 4K which is the default
+ */
+ if (mmu_psize_defs[MMU_PAGE_16M].shift)
+ mmu_linear_psize = MMU_PAGE_16M;
+ else if (mmu_psize_defs[MMU_PAGE_1M].shift)
+ mmu_linear_psize = MMU_PAGE_1M;
+
+ /*
+ * Pick a size for the ordinary pages. Default is 4K, we support
+ * 64K if cache inhibited large pages are supported by the
+ * processor
+ */
+#ifdef CONFIG_PPC_64K_PAGES
+ if (mmu_psize_defs[MMU_PAGE_64K].shift &&
+ cpu_has_feature(CPU_FTR_CI_LARGE_PAGE))
+ mmu_virtual_psize = MMU_PAGE_64K;
+#endif
+
+ printk(KERN_INFO "Page orders: linear mapping = %d, others = %d\n",
+ mmu_psize_defs[mmu_linear_psize].shift,
+ mmu_psize_defs[mmu_virtual_psize].shift);
+
+#ifdef CONFIG_HUGETLB_PAGE
+ /* Init large page size. Currently, we pick 16M or 1M depending
+ * on what is available
+ */
+ if (mmu_psize_defs[MMU_PAGE_16M].shift)
+ mmu_huge_psize = MMU_PAGE_16M;
+ /* With 4k/4level pagetables, we can't (for now) cope with a
+ * huge page size < PMD_SIZE */
+ else if (mmu_psize_defs[MMU_PAGE_1M].shift)
+ mmu_huge_psize = MMU_PAGE_1M;
+
+ /* Calculate HPAGE_SHIFT and sanity check it */
+ if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
+ mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
+ HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
+ else
+ HPAGE_SHIFT = 0; /* No huge pages dude ! */
+#endif /* CONFIG_HUGETLB_PAGE */
+}
+
+static int __init htab_dt_scan_pftsize(unsigned long node,
+ const char *uname, int depth,
+ void *data)
+{
+ char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+ u32 *prop;
+
+ /* We are scanning "cpu" nodes only */
+ if (type == NULL || strcmp(type, "cpu") != 0)
+ return 0;
+
+ prop = (u32 *)of_get_flat_dt_prop(node, "ibm,pft-size", NULL);
+ if (prop != NULL) {
+ /* pft_size[0] is the NUMA CEC cookie */
+ ppc64_pft_size = prop[1];
+ return 1;
+ }
+ return 0;
+}
+
+static unsigned long __init htab_get_table_size(void)
+{
+ unsigned long mem_size, rnd_mem_size, pteg_count;
+
+ /* If hash size isn't already provided by the platform, we try to
+ * retreive it from the device-tree. If it's not there neither, we
+ * calculate it now based on the total RAM size
+ */
+ if (ppc64_pft_size == 0)
+ of_scan_flat_dt(htab_dt_scan_pftsize, NULL);
+ if (ppc64_pft_size)
+ return 1UL << ppc64_pft_size;
+
+ /* round mem_size up to next power of 2 */
+ mem_size = lmb_phys_mem_size();
+ rnd_mem_size = 1UL << __ilog2(mem_size);
+ if (rnd_mem_size < mem_size)
+ rnd_mem_size <<= 1;
+
+ /* # pages / 2 */
+ pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
+
+ return pteg_count << 7;
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+void create_section_mapping(unsigned long start, unsigned long end)
+{
+ BUG_ON(htab_bolt_mapping(start, end, start,
+ _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX,
+ mmu_linear_psize));
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+void __init htab_initialize(void)
+{
+ unsigned long table, htab_size_bytes;
+ unsigned long pteg_count;
+ unsigned long mode_rw;
+ unsigned long base = 0, size = 0;
+ int i;
+
+ extern unsigned long tce_alloc_start, tce_alloc_end;
+
+ DBG(" -> htab_initialize()\n");
+
+ /* Initialize page sizes */
+ htab_init_page_sizes();
+
+ /*
+ * Calculate the required size of the htab. We want the number of
+ * PTEGs to equal one half the number of real pages.
+ */
+ htab_size_bytes = htab_get_table_size();
+ pteg_count = htab_size_bytes >> 7;
+
+ htab_hash_mask = pteg_count - 1;
+
+ if (platform_is_lpar()) {
+ /* Using a hypervisor which owns the htab */
+ htab_address = NULL;
+ _SDR1 = 0;
+ } else {
+ /* Find storage for the HPT. Must be contiguous in
+ * the absolute address space.
+ */
+ table = lmb_alloc(htab_size_bytes, htab_size_bytes);
+ BUG_ON(table == 0);
+
+ DBG("Hash table allocated at %lx, size: %lx\n", table,
+ htab_size_bytes);
+
+ htab_address = abs_to_virt(table);
+
+ /* htab absolute addr + encoded htabsize */
+ _SDR1 = table + __ilog2(pteg_count) - 11;
+
+ /* Initialize the HPT with no entries */
+ memset((void *)table, 0, htab_size_bytes);
+
+ /* Set SDR1 */
+ mtspr(SPRN_SDR1, _SDR1);
+ }
+
+ mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
+
+ /* On U3 based machines, we need to reserve the DART area and
+ * _NOT_ map it to avoid cache paradoxes as it's remapped non
+ * cacheable later on
+ */
+
+ /* create bolted the linear mapping in the hash table */
+ for (i=0; i < lmb.memory.cnt; i++) {
+ base = lmb.memory.region[i].base + KERNELBASE;
+ size = lmb.memory.region[i].size;
+
+ DBG("creating mapping for region: %lx : %lx\n", base, size);
+
+#ifdef CONFIG_U3_DART
+ /* Do not map the DART space. Fortunately, it will be aligned
+ * in such a way that it will not cross two lmb regions and
+ * will fit within a single 16Mb page.
+ * The DART space is assumed to be a full 16Mb region even if
+ * we only use 2Mb of that space. We will use more of it later
+ * for AGP GART. We have to use a full 16Mb large page.
+ */
+ DBG("DART base: %lx\n", dart_tablebase);
+
+ if (dart_tablebase != 0 && dart_tablebase >= base
+ && dart_tablebase < (base + size)) {
+ if (base != dart_tablebase)
+ BUG_ON(htab_bolt_mapping(base, dart_tablebase,
+ base, mode_rw,
+ mmu_linear_psize));
+ if ((base + size) > (dart_tablebase + 16*MB))
+ BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
+ base + size,
+ dart_tablebase+16*MB,
+ mode_rw,
+ mmu_linear_psize));
+ continue;
+ }
+#endif /* CONFIG_U3_DART */
+ BUG_ON(htab_bolt_mapping(base, base + size, base,
+ mode_rw, mmu_linear_psize));
+ }
+
+ /*
+ * If we have a memory_limit and we've allocated TCEs then we need to
+ * explicitly map the TCE area at the top of RAM. We also cope with the
+ * case that the TCEs start below memory_limit.
+ * tce_alloc_start/end are 16MB aligned so the mapping should work
+ * for either 4K or 16MB pages.
+ */
+ if (tce_alloc_start) {
+ tce_alloc_start += KERNELBASE;
+ tce_alloc_end += KERNELBASE;
+
+ if (base + size >= tce_alloc_start)
+ tce_alloc_start = base + size + 1;
+
+ BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
+ tce_alloc_start, mode_rw,
+ mmu_linear_psize));
+ }
+
+ DBG(" <- htab_initialize()\n");
+}
+#undef KB
+#undef MB
+
+void __init htab_initialize_secondary(void)
+{
+ if (!platform_is_lpar())
+ mtspr(SPRN_SDR1, _SDR1);
+}
+
+/*
+ * Called by asm hashtable.S for doing lazy icache flush
+ */
+unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
+{
+ struct page *page;
+
+ if (!pfn_valid(pte_pfn(pte)))
+ return pp;
+
+ page = pte_page(pte);
+
+ /* page is dirty */
+ if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) {
+ if (trap == 0x400) {
+ __flush_dcache_icache(page_address(page));
+ set_bit(PG_arch_1, &page->flags);
+ } else
+ pp |= HPTE_R_N;
+ }
+ return pp;
+}
+
+/* Result code is:
+ * 0 - handled
+ * 1 - normal page fault
+ * -1 - critical hash insertion error
+ */
+int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
+{
+ void *pgdir;
+ unsigned long vsid;
+ struct mm_struct *mm;
+ pte_t *ptep;
+ cpumask_t tmp;
+ int rc, user_region = 0, local = 0;
+
+ DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
+ ea, access, trap);
+
+ if ((ea & ~REGION_MASK) >= PGTABLE_RANGE) {
+ DBG_LOW(" out of pgtable range !\n");
+ return 1;
+ }
+
+ /* Get region & vsid */
+ switch (REGION_ID(ea)) {
+ case USER_REGION_ID:
+ user_region = 1;
+ mm = current->mm;
+ if (! mm) {
+ DBG_LOW(" user region with no mm !\n");
+ return 1;
+ }
+ vsid = get_vsid(mm->context.id, ea);
+ break;
+ case VMALLOC_REGION_ID:
+ mm = &init_mm;
+ vsid = get_kernel_vsid(ea);
+ break;
+ default:
+ /* Not a valid range
+ * Send the problem up to do_page_fault
+ */
+ return 1;
+ }
+ DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
+
+ /* Get pgdir */
+ pgdir = mm->pgd;
+ if (pgdir == NULL)
+ return 1;
+
+ /* Check CPU locality */
+ tmp = cpumask_of_cpu(smp_processor_id());
+ if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
+ local = 1;
+
+ /* Handle hugepage regions */
+ if (unlikely(in_hugepage_area(mm->context, ea))) {
+ DBG_LOW(" -> huge page !\n");
+ return hash_huge_page(mm, access, ea, vsid, local);
+ }
+
+ /* Get PTE and page size from page tables */
+ ptep = find_linux_pte(pgdir, ea);
+ if (ptep == NULL || !pte_present(*ptep)) {
+ DBG_LOW(" no PTE !\n");
+ return 1;
+ }
+
+#ifndef CONFIG_PPC_64K_PAGES
+ DBG_LOW(" i-pte: %016lx\n", pte_val(*ptep));
+#else
+ DBG_LOW(" i-pte: %016lx %016lx\n", pte_val(*ptep),
+ pte_val(*(ptep + PTRS_PER_PTE)));
+#endif
+ /* Pre-check access permissions (will be re-checked atomically
+ * in __hash_page_XX but this pre-check is a fast path
+ */
+ if (access & ~pte_val(*ptep)) {
+ DBG_LOW(" no access !\n");
+ return 1;
+ }
+
+ /* Do actual hashing */
+#ifndef CONFIG_PPC_64K_PAGES
+ rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
+#else
+ if (mmu_virtual_psize == MMU_PAGE_64K)
+ rc = __hash_page_64K(ea, access, vsid, ptep, trap, local);
+ else
+ rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
+#endif /* CONFIG_PPC_64K_PAGES */
+
+#ifndef CONFIG_PPC_64K_PAGES
+ DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep));
+#else
+ DBG_LOW(" o-pte: %016lx %016lx\n", pte_val(*ptep),
+ pte_val(*(ptep + PTRS_PER_PTE)));
+#endif
+ DBG_LOW(" -> rc=%d\n", rc);
+ return rc;
+}
+
+void hash_preload(struct mm_struct *mm, unsigned long ea,
+ unsigned long access, unsigned long trap)
+{
+ unsigned long vsid;
+ void *pgdir;
+ pte_t *ptep;
+ cpumask_t mask;
+ unsigned long flags;
+ int local = 0;
+
+ /* We don't want huge pages prefaulted for now
+ */
+ if (unlikely(in_hugepage_area(mm->context, ea)))
+ return;
+
+ DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx,"
+ " trap=%lx\n", mm, mm->pgd, ea, access, trap);
+
+ /* Get PTE, VSID, access mask */
+ pgdir = mm->pgd;
+ if (pgdir == NULL)
+ return;
+ ptep = find_linux_pte(pgdir, ea);
+ if (!ptep)
+ return;
+ vsid = get_vsid(mm->context.id, ea);
+
+ /* Hash it in */
+ local_irq_save(flags);
+ mask = cpumask_of_cpu(smp_processor_id());
+ if (cpus_equal(mm->cpu_vm_mask, mask))
+ local = 1;
+#ifndef CONFIG_PPC_64K_PAGES
+ __hash_page_4K(ea, access, vsid, ptep, trap, local);
+#else
+ if (mmu_virtual_psize == MMU_PAGE_64K)
+ __hash_page_64K(ea, access, vsid, ptep, trap, local);
+ else
+ __hash_page_4K(ea, access, vsid, ptep, trap, local);
+#endif /* CONFIG_PPC_64K_PAGES */
+ local_irq_restore(flags);
+}
+
+void flush_hash_page(unsigned long va, real_pte_t pte, int psize, int local)
+{
+ unsigned long hash, index, shift, hidx, slot;
+
+ DBG_LOW("flush_hash_page(va=%016x)\n", va);
+ pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
+ hash = hpt_hash(va, shift);
+ hidx = __rpte_to_hidx(pte, index);
+ if (hidx & _PTEIDX_SECONDARY)
+ hash = ~hash;
+ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot += hidx & _PTEIDX_GROUP_IX;
+ DBG_LOW(" sub %d: hash=%x, hidx=%x\n", index, slot, hidx);
+ ppc_md.hpte_invalidate(slot, va, psize, local);
+ } pte_iterate_hashed_end();
+}
+
+void flush_hash_range(unsigned long number, int local)
+{
+ if (ppc_md.flush_hash_range)
+ ppc_md.flush_hash_range(number, local);
+ else {
+ int i;
+ struct ppc64_tlb_batch *batch =
+ &__get_cpu_var(ppc64_tlb_batch);
+
+ for (i = 0; i < number; i++)
+ flush_hash_page(batch->vaddr[i], batch->pte[i],
+ batch->psize, local);
+ }
+}
+
+static inline void make_bl(unsigned int *insn_addr, void *func)
+{
+ unsigned long funcp = *((unsigned long *)func);
+ int offset = funcp - (unsigned long)insn_addr;
+
+ *insn_addr = (unsigned int)(0x48000001 | (offset & 0x03fffffc));
+ flush_icache_range((unsigned long)insn_addr, 4+
+ (unsigned long)insn_addr);
+}
+
+/*
+ * low_hash_fault is called when we the low level hash code failed
+ * to instert a PTE due to an hypervisor error
+ */
+void low_hash_fault(struct pt_regs *regs, unsigned long address)
+{
+ if (user_mode(regs)) {
+ siginfo_t info;
+
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRERR;
+ info.si_addr = (void __user *)address;
+ force_sig_info(SIGBUS, &info, current);
+ return;
+ }
+ bad_page_fault(regs, address, SIGBUS);
+}
+
+void __init htab_finish_init(void)
+{
+ extern unsigned int *htab_call_hpte_insert1;
+ extern unsigned int *htab_call_hpte_insert2;
+ extern unsigned int *htab_call_hpte_remove;
+ extern unsigned int *htab_call_hpte_updatepp;
+
+#ifdef CONFIG_PPC_64K_PAGES
+ extern unsigned int *ht64_call_hpte_insert1;
+ extern unsigned int *ht64_call_hpte_insert2;
+ extern unsigned int *ht64_call_hpte_remove;
+ extern unsigned int *ht64_call_hpte_updatepp;
+
+ make_bl(ht64_call_hpte_insert1, ppc_md.hpte_insert);
+ make_bl(ht64_call_hpte_insert2, ppc_md.hpte_insert);
+ make_bl(ht64_call_hpte_remove, ppc_md.hpte_remove);
+ make_bl(ht64_call_hpte_updatepp, ppc_md.hpte_updatepp);
+#endif /* CONFIG_PPC_64K_PAGES */
+
+ make_bl(htab_call_hpte_insert1, ppc_md.hpte_insert);
+ make_bl(htab_call_hpte_insert2, ppc_md.hpte_insert);
+ make_bl(htab_call_hpte_remove, ppc_md.hpte_remove);
+ make_bl(htab_call_hpte_updatepp, ppc_md.hpte_updatepp);
+}