* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
- * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
-#include <linux/delay.h>
#include <linux/bootmem.h>
-#include <linux/highmem.h>
-#include <linux/idr.h>
-#include <linux/nodemask.h>
-#include <linux/module.h>
+#include <linux/lmb.h>
+#include <linux/slab.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/prom.h>
-#include <asm/lmb.h>
-#include <asm/rtas.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
-#include <asm/uaccess.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/tlb.h>
-#include <asm/eeh.h>
#include <asm/processor.h>
-#include <asm/mmzone.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/system.h>
-#include <asm/iommu.h>
#include <asm/abs_addr.h>
-#include <asm/vdso.h>
+#include <asm/firmware.h>
#include "mmu_decl.h"
-unsigned long ioremap_bot = IMALLOC_BASE;
-static unsigned long phbs_io_bot = PHBS_IO_BASE;
+unsigned long ioremap_bot = IOREMAP_BASE;
-#ifdef CONFIG_PPC_ISERIES
-void __iomem *ioremap(unsigned long addr, unsigned long size)
+#ifdef CONFIG_PPC_MMU_NOHASH
+static void *early_alloc_pgtable(unsigned long size)
{
- return (void __iomem *)addr;
-}
+ void *pt;
-extern void __iomem *__ioremap(unsigned long addr, unsigned long size,
- unsigned long flags)
-{
- return (void __iomem *)addr;
-}
+ if (init_bootmem_done)
+ pt = __alloc_bootmem(size, size, __pa(MAX_DMA_ADDRESS));
+ else
+ pt = __va(lmb_alloc_base(size, size,
+ __pa(MAX_DMA_ADDRESS)));
+ memset(pt, 0, size);
-void iounmap(volatile void __iomem *addr)
-{
- return;
+ return pt;
}
-
-#else
+#endif /* CONFIG_PPC_MMU_NOHASH */
/*
- * map_io_page currently only called by __ioremap
- * map_io_page adds an entry to the ioremap page table
+ * map_kernel_page currently only called by __ioremap
+ * map_kernel_page adds an entry to the ioremap page table
* and adds an entry to the HPT, possibly bolting it
*/
-static int map_io_page(unsigned long ea, unsigned long pa, int flags)
+int map_kernel_page(unsigned long ea, unsigned long pa, int flags)
{
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
- if (mem_init_done) {
+ if (slab_is_available()) {
pgdp = pgd_offset_k(ea);
pudp = pud_alloc(&init_mm, pgdp, ea);
if (!pudp)
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
} else {
+#ifdef CONFIG_PPC_MMU_NOHASH
+ /* Warning ! This will blow up if bootmem is not initialized
+ * which our ppc64 code is keen to do that, we'll need to
+ * fix it and/or be more careful
+ */
+ pgdp = pgd_offset_k(ea);
+#ifdef PUD_TABLE_SIZE
+ if (pgd_none(*pgdp)) {
+ pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
+ BUG_ON(pudp == NULL);
+ pgd_populate(&init_mm, pgdp, pudp);
+ }
+#endif /* PUD_TABLE_SIZE */
+ pudp = pud_offset(pgdp, ea);
+ if (pud_none(*pudp)) {
+ pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
+ BUG_ON(pmdp == NULL);
+ pud_populate(&init_mm, pudp, pmdp);
+ }
+ pmdp = pmd_offset(pudp, ea);
+ if (!pmd_present(*pmdp)) {
+ ptep = early_alloc_pgtable(PAGE_SIZE);
+ BUG_ON(ptep == NULL);
+ pmd_populate_kernel(&init_mm, pmdp, ptep);
+ }
+ ptep = pte_offset_kernel(pmdp, ea);
+ set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
+ __pgprot(flags)));
+#else /* CONFIG_PPC_MMU_NOHASH */
/*
* If the mm subsystem is not fully up, we cannot create a
* linux page table entry for this mapping. Simply bolt an
*
*/
if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
- mmu_virtual_psize)) {
+ mmu_io_psize, mmu_kernel_ssize)) {
printk(KERN_ERR "Failed to do bolted mapping IO "
"memory at %016lx !\n", pa);
return -ENOMEM;
}
+#endif /* !CONFIG_PPC_MMU_NOHASH */
}
return 0;
}
-static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa,
- unsigned long ea, unsigned long size,
+/**
+ * __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);
+ /* Non-cacheable page cannot be coherent */
+ if (flags & _PAGE_NO_CACHE)
+ flags &= ~_PAGE_COHERENT;
+
+ /* We don't support the 4K PFN hack with ioremap */
+ if (flags & _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_io_page(ea+i, pa+i, flags))
+ if (map_kernel_page((unsigned long)ea+i, pa+i, flags))
return NULL;
- return (void __iomem *) (ea + (addr & ~PAGE_MASK));
+ return (void __iomem *)ea;
}
-
-void __iomem *
-ioremap(unsigned long addr, unsigned long size)
+/**
+ * __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)
{
- return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED);
+ WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
+ WARN_ON(size & ~PAGE_MASK);
+
+ unmap_kernel_range((unsigned long)ea, size);
}
-void __iomem * __ioremap(unsigned long addr, unsigned long size,
- unsigned long flags)
+void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
+ unsigned long flags, void *caller)
{
- unsigned long pa, ea;
+ phys_addr_t paligned;
void __iomem *ret;
/*
* IMALLOC_END
*
*/
- pa = addr & PAGE_MASK;
- size = PAGE_ALIGN(addr + size) - pa;
+ paligned = addr & PAGE_MASK;
+ size = PAGE_ALIGN(addr + size) - paligned;
- if ((size == 0) || (pa == 0))
+ if ((size == 0) || (paligned == 0))
return NULL;
if (mem_init_done) {
struct vm_struct *area;
- area = im_get_free_area(size);
+
+ area = __get_vm_area_caller(size, VM_IOREMAP,
+ ioremap_bot, IOREMAP_END,
+ caller);
if (area == NULL)
return NULL;
- ea = (unsigned long)(area->addr);
- ret = __ioremap_com(addr, pa, ea, size, flags);
+ ret = __ioremap_at(paligned, area->addr, size, flags);
if (!ret)
- im_free(area->addr);
+ vunmap(area->addr);
} else {
- ea = ioremap_bot;
- ret = __ioremap_com(addr, pa, ea, size, flags);
+ ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags);
if (ret)
ioremap_bot += size;
}
+
+ if (ret)
+ ret += addr & ~PAGE_MASK;
return ret;
}
-#define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
+void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
+ unsigned long flags)
+{
+ return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
+}
-int __ioremap_explicit(unsigned long pa, unsigned long ea,
- unsigned long size, unsigned long flags)
+void __iomem * ioremap(phys_addr_t addr, unsigned long size)
{
- struct vm_struct *area;
- void __iomem *ret;
-
- /* For now, require page-aligned values for pa, ea, and size */
- if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
- !IS_PAGE_ALIGNED(size)) {
- printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
- return 1;
- }
-
- if (!mem_init_done) {
- /* Two things to consider in this case:
- * 1) No records will be kept (imalloc, etc) that the region
- * has been remapped
- * 2) It won't be easy to iounmap() the region later (because
- * of 1)
- */
- ;
- } else {
- area = im_get_area(ea, size,
- IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
- if (area == NULL) {
- /* Expected when PHB-dlpar is in play */
- return 1;
- }
- if (ea != (unsigned long) area->addr) {
- printk(KERN_ERR "unexpected addr return from "
- "im_get_area\n");
- return 1;
- }
- }
-
- ret = __ioremap_com(pa, pa, ea, size, flags);
- if (ret == NULL) {
- printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
- return 1;
- }
- if (ret != (void *) ea) {
- printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
- return 1;
- }
+ unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED;
+ void *caller = __builtin_return_address(0);
- return 0;
+ if (ppc_md.ioremap)
+ return ppc_md.ioremap(addr, size, flags, caller);
+ return __ioremap_caller(addr, size, flags, caller);
+}
+
+void __iomem * ioremap_flags(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_RW)
+ flags |= _PAGE_DIRTY;
+
+ /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
+ flags &= ~(_PAGE_USER | _PAGE_EXEC);
+
+ 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.
- * This code is modeled after vmalloc code - unmap_vm_area()
- *
- * XXX what about calls before mem_init_done (ie python_countermeasures())
*/
-void iounmap(volatile void __iomem *token)
+void __iounmap(volatile void __iomem *token)
{
void *addr;
if (!mem_init_done)
return;
- addr = (void *) ((unsigned long __force) token & PAGE_MASK);
-
- im_free(addr);
-}
-
-static int iounmap_subset_regions(unsigned long addr, unsigned long size)
-{
- struct vm_struct *area;
-
- /* Check whether subsets of this region exist */
- area = im_get_area(addr, size, IM_REGION_SUPERSET);
- if (area == NULL)
- return 1;
-
- while (area) {
- iounmap((void __iomem *) area->addr);
- area = im_get_area(addr, size,
- IM_REGION_SUPERSET);
+ 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;
}
-
- return 0;
+ vunmap(addr);
}
-int iounmap_explicit(volatile void __iomem *start, unsigned long size)
+void iounmap(volatile void __iomem *token)
{
- struct vm_struct *area;
- unsigned long addr;
- int rc;
-
- addr = (unsigned long __force) start & PAGE_MASK;
-
- /* Verify that the region either exists or is a subset of an existing
- * region. In the latter case, split the parent region to create
- * the exact region
- */
- area = im_get_area(addr, size,
- IM_REGION_EXISTS | IM_REGION_SUBSET);
- if (area == NULL) {
- /* Determine whether subset regions exist. If so, unmap */
- rc = iounmap_subset_regions(addr, size);
- if (rc) {
- printk(KERN_ERR
- "%s() cannot unmap nonexistent range 0x%lx\n",
- __FUNCTION__, addr);
- return 1;
- }
- } else {
- iounmap((void __iomem *) area->addr);
- }
- /*
- * FIXME! This can't be right:
- iounmap(area->addr);
- * Maybe it should be "iounmap(area);"
- */
- return 0;
+ if (ppc_md.iounmap)
+ ppc_md.iounmap(token);
+ else
+ __iounmap(token);
}
-#endif
-
EXPORT_SYMBOL(ioremap);
+EXPORT_SYMBOL(ioremap_flags);
EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(__ioremap_at);
EXPORT_SYMBOL(iounmap);
-
-void __iomem * reserve_phb_iospace(unsigned long size)
-{
- void __iomem *virt_addr;
-
- if (phbs_io_bot >= IMALLOC_BASE)
- panic("reserve_phb_iospace(): phb io space overflow\n");
-
- virt_addr = (void __iomem *) phbs_io_bot;
- phbs_io_bot += size;
-
- return virt_addr;
-}
+EXPORT_SYMBOL(__iounmap);
+EXPORT_SYMBOL(__iounmap_at);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff