Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 335 insertions, 0 deletions

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
new file mode 100644
index 000000000..53e9eeecd
--- /dev/null
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -0,0 +1,335 @@
+/*
+ *  This file contains ioremap and related functions for 64-bit machines.
+ *
+ *  Derived from arch/ppc64/mm/init.c
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
+ *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ *    Copyright (C) 1996 Paul Mackerras
+ *
+ *  Derived from "arch/i386/mm/init.c"
+ *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ *  Dave Engebretsen <engebret@us.ibm.com>
+ *      Rework for PPC64 port.
+ *
+ *  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/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/hugetlb.h>
+
+#include <asm/pgalloc.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/smp.h>
+#include <asm/machdep.h>
+#include <asm/tlb.h>
+#include <asm/processor.h>
+#include <asm/cputable.h>
+#include <asm/sections.h>
+#include <asm/firmware.h>
+#include <asm/dma.h>
+
+#include "mmu_decl.h"
+
+
+#ifdef CONFIG_PPC_BOOK3S_64
+/*
+ * partition table and process table for ISA 3.0
+ */
+struct prtb_entry *process_tb;
+struct patb_entry *partition_tb;
+/*
+ * page table size
+ */
+unsigned long __pte_index_size;
+EXPORT_SYMBOL(__pte_index_size);
+unsigned long __pmd_index_size;
+EXPORT_SYMBOL(__pmd_index_size);
+unsigned long __pud_index_size;
+EXPORT_SYMBOL(__pud_index_size);
+unsigned long __pgd_index_size;
+EXPORT_SYMBOL(__pgd_index_size);
+unsigned long __pud_cache_index;
+EXPORT_SYMBOL(__pud_cache_index);
+unsigned long __pte_table_size;
+EXPORT_SYMBOL(__pte_table_size);
+unsigned long __pmd_table_size;
+EXPORT_SYMBOL(__pmd_table_size);
+unsigned long __pud_table_size;
+EXPORT_SYMBOL(__pud_table_size);
+unsigned long __pgd_table_size;
+EXPORT_SYMBOL(__pgd_table_size);
+unsigned long __pmd_val_bits;
+EXPORT_SYMBOL(__pmd_val_bits);
+unsigned long __pud_val_bits;
+EXPORT_SYMBOL(__pud_val_bits);
+unsigned long __pgd_val_bits;
+EXPORT_SYMBOL(__pgd_val_bits);
+unsigned long __kernel_virt_start;
+EXPORT_SYMBOL(__kernel_virt_start);
+unsigned long __kernel_virt_size;
+EXPORT_SYMBOL(__kernel_virt_size);
+unsigned long __vmalloc_start;
+EXPORT_SYMBOL(__vmalloc_start);
+unsigned long __vmalloc_end;
+EXPORT_SYMBOL(__vmalloc_end);
+unsigned long __kernel_io_start;
+EXPORT_SYMBOL(__kernel_io_start);
+struct page *vmemmap;
+EXPORT_SYMBOL(vmemmap);
+unsigned long __pte_frag_nr;
+EXPORT_SYMBOL(__pte_frag_nr);
+unsigned long __pte_frag_size_shift;
+EXPORT_SYMBOL(__pte_frag_size_shift);
+unsigned long ioremap_bot;
+#else /* !CONFIG_PPC_BOOK3S_64 */
+unsigned long ioremap_bot = IOREMAP_BASE;
+#endif
+
+/**
+ * __ioremap_at - Low level function to establish the page tables
+ *                for an IO mapping
+ */
+void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
+			    unsigned long flags)
+{
+	unsigned long i;
+
+	/* Make sure we have the base flags */
+	if ((flags & _PAGE_PRESENT) == 0)
+		flags |= pgprot_val(PAGE_KERNEL);
+
+	/* We don't support the 4K PFN hack with ioremap */
+	if (flags & H_PAGE_4K_PFN)
+		return NULL;
+
+	WARN_ON(pa & ~PAGE_MASK);
+	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
+	WARN_ON(size & ~PAGE_MASK);
+
+	for (i = 0; i < size; i += PAGE_SIZE)
+		if (map_kernel_page((unsigned long)ea+i, pa+i, flags))
+			return NULL;
+
+	return (void __iomem *)ea;
+}
+
+/**
+ * __iounmap_from - Low level function to tear down the page tables
+ *                  for an IO mapping. This is used for mappings that
+ *                  are manipulated manually, like partial unmapping of
+ *                  PCI IOs or ISA space.
+ */
+void __iounmap_at(void *ea, unsigned long size)
+{
+	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
+	WARN_ON(size & ~PAGE_MASK);
+
+	unmap_kernel_range((unsigned long)ea, size);
+}
+
+void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
+				unsigned long flags, void *caller)
+{
+	phys_addr_t paligned;
+	void __iomem *ret;
+
+	/*
+	 * Choose an address to map it to.
+	 * Once the imalloc system is running, we use it.
+	 * Before that, we map using addresses going
+	 * up from ioremap_bot.  imalloc will use
+	 * the addresses from ioremap_bot through
+	 * IMALLOC_END
+	 * 
+	 */
+	paligned = addr & PAGE_MASK;
+	size = PAGE_ALIGN(addr + size) - paligned;
+
+	if ((size == 0) || (paligned == 0))
+		return NULL;
+
+	if (slab_is_available()) {
+		struct vm_struct *area;
+
+		area = __get_vm_area_caller(size, VM_IOREMAP,
+					    ioremap_bot, IOREMAP_END,
+					    caller);
+		if (area == NULL)
+			return NULL;
+
+		area->phys_addr = paligned;
+		ret = __ioremap_at(paligned, area->addr, size, flags);
+		if (!ret)
+			vunmap(area->addr);
+	} else {
+		ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags);
+		if (ret)
+			ioremap_bot += size;
+	}
+
+	if (ret)
+		ret += addr & ~PAGE_MASK;
+	return ret;
+}
+
+void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
+			 unsigned long flags)
+{
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
+}
+
+void __iomem * ioremap(phys_addr_t addr, unsigned long size)
+{
+	unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0)));
+	void *caller = __builtin_return_address(0);
+
+	if (ppc_md.ioremap)
+		return ppc_md.ioremap(addr, size, flags, caller);
+	return __ioremap_caller(addr, size, flags, caller);
+}
+
+void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
+{
+	unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0)));
+	void *caller = __builtin_return_address(0);
+
+	if (ppc_md.ioremap)
+		return ppc_md.ioremap(addr, size, flags, caller);
+	return __ioremap_caller(addr, size, flags, caller);
+}
+
+void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
+			     unsigned long flags)
+{
+	void *caller = __builtin_return_address(0);
+
+	/* writeable implies dirty for kernel addresses */
+	if (flags & _PAGE_WRITE)
+		flags |= _PAGE_DIRTY;
+
+	/* we don't want to let _PAGE_EXEC leak out */
+	flags &= ~_PAGE_EXEC;
+	/*
+	 * Force kernel mapping.
+	 */
+	flags &= ~_PAGE_USER;
+	flags |= _PAGE_PRIVILEGED;
+
+	if (ppc_md.ioremap)
+		return ppc_md.ioremap(addr, size, flags, caller);
+	return __ioremap_caller(addr, size, flags, caller);
+}
+
+
+/*  
+ * Unmap an IO region and remove it from imalloc'd list.
+ * Access to IO memory should be serialized by driver.
+ */
+void __iounmap(volatile void __iomem *token)
+{
+	void *addr;
+
+	if (!slab_is_available())
+		return;
+	
+	addr = (void *) ((unsigned long __force)
+			 PCI_FIX_ADDR(token) & PAGE_MASK);
+	if ((unsigned long)addr < ioremap_bot) {
+		printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
+		       " at 0x%p\n", addr);
+		return;
+	}
+	vunmap(addr);
+}
+
+void iounmap(volatile void __iomem *token)
+{
+	if (ppc_md.iounmap)
+		ppc_md.iounmap(token);
+	else
+		__iounmap(token);
+}
+
+EXPORT_SYMBOL(ioremap);
+EXPORT_SYMBOL(ioremap_wc);
+EXPORT_SYMBOL(ioremap_prot);
+EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(__ioremap_at);
+EXPORT_SYMBOL(iounmap);
+EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(__iounmap_at);
+
+#ifndef __PAGETABLE_PUD_FOLDED
+/* 4 level page table */
+struct page *pgd_page(pgd_t pgd)
+{
+	if (pgd_huge(pgd))
+		return pte_page(pgd_pte(pgd));
+	return virt_to_page(pgd_page_vaddr(pgd));
+}
+#endif
+
+struct page *pud_page(pud_t pud)
+{
+	if (pud_huge(pud))
+		return pte_page(pud_pte(pud));
+	return virt_to_page(pud_page_vaddr(pud));
+}
+
+/*
+ * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
+ * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
+ */
+struct page *pmd_page(pmd_t pmd)
+{
+	if (pmd_trans_huge(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
+		return pte_page(pmd_pte(pmd));
+	return virt_to_page(pmd_page_vaddr(pmd));
+}
+
+#ifdef CONFIG_STRICT_KERNEL_RWX
+void mark_rodata_ro(void)
+{
+	if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
+		pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
+		return;
+	}
+
+	if (radix_enabled())
+		radix__mark_rodata_ro();
+	else
+		hash__mark_rodata_ro();
+}
+
+void mark_initmem_nx(void)
+{
+	if (radix_enabled())
+		radix__mark_initmem_nx();
+	else
+		hash__mark_initmem_nx();
+}
+#endif