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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/cris/mm
downloadvexpress-lsk-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/cris/mm')
-rw-r--r--arch/cris/mm/Makefile6
-rw-r--r--arch/cris/mm/fault.c387
-rw-r--r--arch/cris/mm/init.c225
-rw-r--r--arch/cris/mm/ioremap.c146
-rw-r--r--arch/cris/mm/tlb.c126
5 files changed, 890 insertions, 0 deletions
diff --git a/arch/cris/mm/Makefile b/arch/cris/mm/Makefile
new file mode 100644
index 00000000000..d3ae08c90b4
--- /dev/null
+++ b/arch/cris/mm/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the linux cris-specific parts of the memory manager.
+#
+
+obj-y := init.o fault.o tlb.o ioremap.o
+
diff --git a/arch/cris/mm/fault.c b/arch/cris/mm/fault.c
new file mode 100644
index 00000000000..03254b9eded
--- /dev/null
+++ b/arch/cris/mm/fault.c
@@ -0,0 +1,387 @@
+/*
+ * linux/arch/cris/mm/fault.c
+ *
+ * Copyright (C) 2000, 2001 Axis Communications AB
+ *
+ * Authors: Bjorn Wesen
+ *
+ * $Log: fault.c,v $
+ * Revision 1.11 2004/05/14 07:58:05 starvik
+ * Merge of changes from 2.4
+ *
+ * Revision 1.10 2003/10/27 14:51:24 starvik
+ * Removed debugcode
+ *
+ * Revision 1.9 2003/10/27 14:50:42 starvik
+ * Changed do_page_fault signature
+ *
+ * Revision 1.8 2003/07/04 13:02:48 tobiasa
+ * Moved code snippet from arch/cris/mm/fault.c that searches for fixup code
+ * to seperate function in arch-specific files.
+ *
+ * Revision 1.7 2003/01/22 06:48:38 starvik
+ * Fixed warnings issued by GCC 3.2.1
+ *
+ * Revision 1.6 2003/01/09 14:42:52 starvik
+ * Merge of Linux 2.5.55
+ *
+ * Revision 1.5 2002/12/11 14:44:48 starvik
+ * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
+ *
+ * Revision 1.4 2002/11/13 15:10:28 starvik
+ * pte_offset has been renamed to pte_offset_kernel
+ *
+ * Revision 1.3 2002/11/05 06:45:13 starvik
+ * Merge of Linux 2.5.45
+ *
+ * Revision 1.2 2001/12/18 13:35:22 bjornw
+ * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
+ *
+ * Revision 1.20 2001/11/22 13:34:06 bjornw
+ * * Bug workaround (LX TR89): force a rerun of the whole of an interrupted
+ * unaligned write, because the second half of the write will be corrupted
+ * otherwise. Affected unaligned writes spanning not-yet mapped pages.
+ * * Optimization: use the wr_rd bit in R_MMU_CAUSE to know whether a miss
+ * was due to a read or a write (before we didn't know this until the next
+ * restart of the interrupted instruction, thus wasting one fault-irq)
+ *
+ * Revision 1.19 2001/11/12 19:02:10 pkj
+ * Fixed compiler warnings.
+ *
+ * Revision 1.18 2001/07/18 22:14:32 bjornw
+ * Enable interrupts in the bulk of do_page_fault
+ *
+ * Revision 1.17 2001/07/18 13:07:23 bjornw
+ * * Detect non-existant PTE's in vmalloc pmd synchronization
+ * * Remove comment about fast-paths for VMALLOC_START etc, because all that
+ * was totally bogus anyway it turned out :)
+ * * Fix detection of vmalloc-area synchronization
+ * * Add some comments
+ *
+ * Revision 1.16 2001/06/13 00:06:08 bjornw
+ * current_pgd should be volatile
+ *
+ * Revision 1.15 2001/06/13 00:02:23 bjornw
+ * Use a separate variable to store the current pgd to avoid races in schedule
+ *
+ * Revision 1.14 2001/05/16 17:41:07 hp
+ * Last comment tweak further tweaked.
+ *
+ * Revision 1.13 2001/05/15 00:58:44 hp
+ * Expand a bit on the comment why we compare address >= TASK_SIZE rather
+ * than >= VMALLOC_START.
+ *
+ * Revision 1.12 2001/04/04 10:51:14 bjornw
+ * mmap_sem is grabbed for reading
+ *
+ * Revision 1.11 2001/03/23 07:36:07 starvik
+ * Corrected according to review remarks
+ *
+ * Revision 1.10 2001/03/21 16:10:11 bjornw
+ * CRIS_FRAME_FIXUP not needed anymore, use FRAME_NORMAL
+ *
+ * Revision 1.9 2001/03/05 13:22:20 bjornw
+ * Spell-fix and fix in vmalloc_fault handling
+ *
+ * Revision 1.8 2000/11/22 14:45:31 bjornw
+ * * 2.4.0-test10 removed the set_pgdir instantaneous kernel global mapping
+ * into all processes. Instead we fill in the missing PTE entries on demand.
+ *
+ * Revision 1.7 2000/11/21 16:39:09 bjornw
+ * fixup switches frametype
+ *
+ * Revision 1.6 2000/11/17 16:54:08 bjornw
+ * More detailed siginfo reporting
+ *
+ *
+ */
+
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+extern int find_fixup_code(struct pt_regs *);
+extern void die_if_kernel(const char *, struct pt_regs *, long);
+
+/* debug of low-level TLB reload */
+#undef DEBUG
+
+#ifdef DEBUG
+#define D(x) x
+#else
+#define D(x)
+#endif
+
+/* debug of higher-level faults */
+#define DPG(x)
+
+/* current active page directory */
+
+volatile pgd_t *current_pgd;
+
+/*
+ * This routine handles page faults. It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ *
+ * Notice that the address we're given is aligned to the page the fault
+ * occurred in, since we only get the PFN in R_MMU_CAUSE not the complete
+ * address.
+ *
+ * error_code:
+ * bit 0 == 0 means no page found, 1 means protection fault
+ * bit 1 == 0 means read, 1 means write
+ *
+ * If this routine detects a bad access, it returns 1, otherwise it
+ * returns 0.
+ */
+
+asmlinkage void
+do_page_fault(unsigned long address, struct pt_regs *regs,
+ int protection, int writeaccess)
+{
+ struct task_struct *tsk;
+ struct mm_struct *mm;
+ struct vm_area_struct * vma;
+ siginfo_t info;
+
+ D(printk("Page fault for %X at %X, prot %d write %d\n",
+ address, regs->erp, protection, writeaccess));
+
+ tsk = current;
+
+ /*
+ * We fault-in kernel-space virtual memory on-demand. The
+ * 'reference' page table is init_mm.pgd.
+ *
+ * NOTE! We MUST NOT take any locks for this case. We may
+ * be in an interrupt or a critical region, and should
+ * only copy the information from the master page table,
+ * nothing more.
+ *
+ * NOTE2: This is done so that, when updating the vmalloc
+ * mappings we don't have to walk all processes pgdirs and
+ * add the high mappings all at once. Instead we do it as they
+ * are used. However vmalloc'ed page entries have the PAGE_GLOBAL
+ * bit set so sometimes the TLB can use a lingering entry.
+ *
+ * This verifies that the fault happens in kernel space
+ * and that the fault was not a protection error (error_code & 1).
+ */
+
+ if (address >= VMALLOC_START &&
+ !protection &&
+ !user_mode(regs))
+ goto vmalloc_fault;
+
+ /* we can and should enable interrupts at this point */
+ sti();
+
+ mm = tsk->mm;
+ info.si_code = SEGV_MAPERR;
+
+ /*
+ * If we're in an interrupt or have no user
+ * context, we must not take the fault..
+ */
+
+ if (in_interrupt() || !mm)
+ goto no_context;
+
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, address);
+ if (!vma)
+ goto bad_area;
+ if (vma->vm_start <= address)
+ goto good_area;
+ if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto bad_area;
+ if (user_mode(regs)) {
+ /*
+ * accessing the stack below usp is always a bug.
+ * we get page-aligned addresses so we can only check
+ * if we're within a page from usp, but that might be
+ * enough to catch brutal errors at least.
+ */
+ if (address + PAGE_SIZE < rdusp())
+ goto bad_area;
+ }
+ if (expand_stack(vma, address))
+ goto bad_area;
+
+ /*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+
+ good_area:
+ info.si_code = SEGV_ACCERR;
+
+ /* first do some preliminary protection checks */
+
+ if (writeaccess) {
+ if (!(vma->vm_flags & VM_WRITE))
+ goto bad_area;
+ } else {
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+ goto bad_area;
+ }
+
+ /*
+ * If for any reason at all we couldn't handle the fault,
+ * make sure we exit gracefully rather than endlessly redo
+ * the fault.
+ */
+
+ switch (handle_mm_fault(mm, vma, address, writeaccess)) {
+ case 1:
+ tsk->min_flt++;
+ break;
+ case 2:
+ tsk->maj_flt++;
+ break;
+ case 0:
+ goto do_sigbus;
+ default:
+ goto out_of_memory;
+ }
+
+ up_read(&mm->mmap_sem);
+ return;
+
+ /*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+
+ bad_area:
+ up_read(&mm->mmap_sem);
+
+ bad_area_nosemaphore:
+ DPG(show_registers(regs));
+
+ /* User mode accesses just cause a SIGSEGV */
+
+ if (user_mode(regs)) {
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ /* info.si_code has been set above */
+ info.si_addr = (void *)address;
+ force_sig_info(SIGSEGV, &info, tsk);
+ return;
+ }
+
+ no_context:
+
+ /* Are we prepared to handle this kernel fault?
+ *
+ * (The kernel has valid exception-points in the source
+ * when it acesses user-memory. When it fails in one
+ * of those points, we find it in a table and do a jump
+ * to some fixup code that loads an appropriate error
+ * code)
+ */
+
+ if (find_fixup_code(regs))
+ return;
+
+ /*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+
+ if ((unsigned long) (address) < PAGE_SIZE)
+ printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
+ else
+ printk(KERN_ALERT "Unable to handle kernel access");
+ printk(" at virtual address %08lx\n",address);
+
+ die_if_kernel("Oops", regs, (writeaccess << 1) | protection);
+
+ do_exit(SIGKILL);
+
+ /*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+
+ out_of_memory:
+ up_read(&mm->mmap_sem);
+ printk("VM: killing process %s\n", tsk->comm);
+ if (user_mode(regs))
+ do_exit(SIGKILL);
+ goto no_context;
+
+ do_sigbus:
+ up_read(&mm->mmap_sem);
+
+ /*
+ * Send a sigbus, regardless of whether we were in kernel
+ * or user mode.
+ */
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRERR;
+ info.si_addr = (void *)address;
+ force_sig_info(SIGBUS, &info, tsk);
+
+ /* Kernel mode? Handle exceptions or die */
+ if (!user_mode(regs))
+ goto no_context;
+ return;
+
+vmalloc_fault:
+ {
+ /*
+ * Synchronize this task's top level page-table
+ * with the 'reference' page table.
+ *
+ * Use current_pgd instead of tsk->active_mm->pgd
+ * since the latter might be unavailable if this
+ * code is executed in a misfortunately run irq
+ * (like inside schedule() between switch_mm and
+ * switch_to...).
+ */
+
+ int offset = pgd_index(address);
+ pgd_t *pgd, *pgd_k;
+ pmd_t *pmd, *pmd_k;
+ pte_t *pte_k;
+
+ pgd = (pgd_t *)current_pgd + offset;
+ pgd_k = init_mm.pgd + offset;
+
+ /* Since we're two-level, we don't need to do both
+ * set_pgd and set_pmd (they do the same thing). If
+ * we go three-level at some point, do the right thing
+ * with pgd_present and set_pgd here.
+ *
+ * Also, since the vmalloc area is global, we don't
+ * need to copy individual PTE's, it is enough to
+ * copy the pgd pointer into the pte page of the
+ * root task. If that is there, we'll find our pte if
+ * it exists.
+ */
+
+ pmd = pmd_offset(pgd, address);
+ pmd_k = pmd_offset(pgd_k, address);
+
+ if (!pmd_present(*pmd_k))
+ goto bad_area_nosemaphore;
+
+ set_pmd(pmd, *pmd_k);
+
+ /* Make sure the actual PTE exists as well to
+ * catch kernel vmalloc-area accesses to non-mapped
+ * addresses. If we don't do this, this will just
+ * silently loop forever.
+ */
+
+ pte_k = pte_offset_kernel(pmd_k, address);
+ if (!pte_present(*pte_k))
+ goto no_context;
+
+ return;
+ }
+}
diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c
new file mode 100644
index 00000000000..31a0018b525
--- /dev/null
+++ b/arch/cris/mm/init.c
@@ -0,0 +1,225 @@
+/*
+ * linux/arch/cris/mm/init.c
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 2000,2001 Axis Communications AB
+ *
+ * Authors: Bjorn Wesen (bjornw@axis.com)
+ *
+ * $Log: init.c,v $
+ * Revision 1.11 2004/05/28 09:28:56 starvik
+ * Calculation of loops_per_usec moved because initalization order has changed
+ * in Linux 2.6.
+ *
+ * Revision 1.10 2004/05/14 07:58:05 starvik
+ * Merge of changes from 2.4
+ *
+ * Revision 1.9 2003/07/04 08:27:54 starvik
+ * Merge of Linux 2.5.74
+ *
+ * Revision 1.8 2003/04/09 05:20:48 starvik
+ * Merge of Linux 2.5.67
+ *
+ * Revision 1.7 2003/01/22 06:48:38 starvik
+ * Fixed warnings issued by GCC 3.2.1
+ *
+ * Revision 1.6 2002/12/11 14:44:48 starvik
+ * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
+ *
+ * Revision 1.5 2002/11/18 07:37:37 starvik
+ * Added cache bug workaround (from Linux 2.4)
+ *
+ * Revision 1.4 2002/11/13 15:40:24 starvik
+ * Removed the page table cache stuff (as done in other archs)
+ *
+ * Revision 1.3 2002/11/05 06:45:13 starvik
+ * Merge of Linux 2.5.45
+ *
+ * Revision 1.2 2001/12/18 13:35:22 bjornw
+ * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
+ *
+ * Revision 1.31 2001/11/13 16:22:00 bjornw
+ * Skip calculating totalram and sharedram in si_meminfo
+ *
+ * Revision 1.30 2001/11/12 19:02:10 pkj
+ * Fixed compiler warnings.
+ *
+ * Revision 1.29 2001/07/25 16:09:50 bjornw
+ * val->sharedram will stay 0
+ *
+ * Revision 1.28 2001/06/28 16:30:17 bjornw
+ * Oops. This needs to wait until 2.4.6 is merged
+ *
+ * Revision 1.27 2001/06/28 14:04:07 bjornw
+ * Fill in sharedram
+ *
+ * Revision 1.26 2001/06/18 06:36:02 hp
+ * Enable free_initmem of __init-type pages
+ *
+ * Revision 1.25 2001/06/13 00:02:23 bjornw
+ * Use a separate variable to store the current pgd to avoid races in schedule
+ *
+ * Revision 1.24 2001/05/15 00:52:20 hp
+ * Only map segment 0xa as seg if CONFIG_JULIETTE
+ *
+ * Revision 1.23 2001/04/04 14:35:40 bjornw
+ * * Removed get_pte_slow and friends (2.4.3 change)
+ * * Removed bad_pmd handling (2.4.3 change)
+ *
+ * Revision 1.22 2001/04/04 13:38:04 matsfg
+ * Moved ioremap to a separate function instead
+ *
+ * Revision 1.21 2001/03/27 09:28:33 bjornw
+ * ioremap used too early - lets try it in mem_init instead
+ *
+ * Revision 1.20 2001/03/23 07:39:21 starvik
+ * Corrected according to review remarks
+ *
+ * Revision 1.19 2001/03/15 14:25:17 bjornw
+ * More general shadow registers and ioremaped addresses for external I/O
+ *
+ * Revision 1.18 2001/02/23 12:46:44 bjornw
+ * * 0xc was not CSE1; 0x8 is, same as uncached flash, so we move the uncached
+ * flash during CRIS_LOW_MAP from 0xe to 0x8 so both the flash and the I/O
+ * is mapped straight over (for !CRIS_LOW_MAP the uncached flash is still 0xe)
+ *
+ * Revision 1.17 2001/02/22 15:05:21 bjornw
+ * Map 0x9 straight over during LOW_MAP to allow for memory mapped LEDs
+ *
+ * Revision 1.16 2001/02/22 15:02:35 bjornw
+ * Map 0xc straight over during LOW_MAP to allow for memory mapped I/O
+ *
+ * Revision 1.15 2001/01/10 21:12:10 bjornw
+ * loops_per_sec -> loops_per_jiffy
+ *
+ * Revision 1.14 2000/11/22 16:23:20 bjornw
+ * Initialize totalhigh counters to 0 to make /proc/meminfo look nice.
+ *
+ * Revision 1.13 2000/11/21 16:37:51 bjornw
+ * Temporarily disable initmem freeing
+ *
+ * Revision 1.12 2000/11/21 13:55:07 bjornw
+ * Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
+ *
+ * Revision 1.11 2000/10/06 12:38:22 bjornw
+ * Cast empty_bad_page correctly (should really be of * type from the start..
+ *
+ * Revision 1.10 2000/10/04 16:53:57 bjornw
+ * Fix memory-map due to LX features
+ *
+ * Revision 1.9 2000/09/13 15:47:49 bjornw
+ * Wrong count in reserved-pages loop
+ *
+ * Revision 1.8 2000/09/13 14:35:10 bjornw
+ * 2.4.0-test8 added a new arg to free_area_init_node
+ *
+ * Revision 1.7 2000/08/17 15:35:55 bjornw
+ * 2.4.0-test6 removed MAP_NR and inserted virt_to_page
+ *
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+unsigned long empty_zero_page;
+
+extern char _stext, _edata, _etext; /* From linkerscript */
+extern char __init_begin, __init_end;
+
+void
+show_mem(void)
+{
+ int i,free = 0,total = 0,cached = 0, reserved = 0, nonshared = 0;
+ int shared = 0;
+
+ printk("\nMem-info:\n");
+ show_free_areas();
+ printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (!page_count(mem_map+i))
+ free++;
+ else if (page_count(mem_map+i) == 1)
+ nonshared++;
+ else
+ shared += page_count(mem_map+i) - 1;
+ }
+ printk("%d pages of RAM\n",total);
+ printk("%d free pages\n",free);
+ printk("%d reserved pages\n",reserved);
+ printk("%d pages nonshared\n",nonshared);
+ printk("%d pages shared\n",shared);
+ printk("%d pages swap cached\n",cached);
+}
+
+void __init
+mem_init(void)
+{
+ int codesize, reservedpages, datasize, initsize;
+ unsigned long tmp;
+
+ if(!mem_map)
+ BUG();
+
+ /* max/min_low_pfn was set by setup.c
+ * now we just copy it to some other necessary places...
+ *
+ * high_memory was also set in setup.c
+ */
+
+ max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
+
+ /* this will put all memory onto the freelists */
+ totalram_pages = free_all_bootmem();
+
+ reservedpages = 0;
+ for (tmp = 0; tmp < max_mapnr; tmp++) {
+ /*
+ * Only count reserved RAM pages
+ */
+ if (PageReserved(mem_map + tmp))
+ reservedpages++;
+ }
+
+ codesize = (unsigned long) &_etext - (unsigned long) &_stext;
+ datasize = (unsigned long) &_edata - (unsigned long) &_etext;
+ initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+ printk(KERN_INFO
+ "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
+ "%dk init)\n" ,
+ (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+ max_mapnr << (PAGE_SHIFT-10),
+ codesize >> 10,
+ reservedpages << (PAGE_SHIFT-10),
+ datasize >> 10,
+ initsize >> 10
+ );
+}
+
+/* free the pages occupied by initialization code */
+
+void
+free_initmem(void)
+{
+ unsigned long addr;
+
+ addr = (unsigned long)(&__init_begin);
+ for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ totalram_pages++;
+ }
+ printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
+ (unsigned long)((&__init_end - &__init_begin) >> 10));
+}
diff --git a/arch/cris/mm/ioremap.c b/arch/cris/mm/ioremap.c
new file mode 100644
index 00000000000..6b9130bfb6c
--- /dev/null
+++ b/arch/cris/mm/ioremap.c
@@ -0,0 +1,146 @@
+/*
+ * arch/cris/mm/ioremap.c
+ *
+ * Re-map IO memory to kernel address space so that we can access it.
+ * Needed for memory-mapped I/O devices mapped outside our normal DRAM
+ * window (that is, all memory-mapped I/O devices).
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * CRIS-port by Axis Communications AB
+ */
+
+#include <linux/vmalloc.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+extern inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
+ unsigned long phys_addr, unsigned long flags)
+{
+ unsigned long end;
+
+ address &= ~PMD_MASK;
+ end = address + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ if (address >= end)
+ BUG();
+ do {
+ if (!pte_none(*pte)) {
+ printk("remap_area_pte: page already exists\n");
+ BUG();
+ }
+ set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | __READABLE |
+ __WRITEABLE | _PAGE_GLOBAL |
+ _PAGE_KERNEL | flags)));
+ address += PAGE_SIZE;
+ phys_addr += PAGE_SIZE;
+ pte++;
+ } while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
+ unsigned long phys_addr, unsigned long flags)
+{
+ unsigned long end;
+
+ address &= ~PGDIR_MASK;
+ end = address + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ phys_addr -= address;
+ if (address >= end)
+ BUG();
+ do {
+ pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
+ if (!pte)
+ return -ENOMEM;
+ remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+ address = (address + PMD_SIZE) & PMD_MASK;
+ pmd++;
+ } while (address && (address < end));
+ return 0;
+}
+
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+ unsigned long size, unsigned long flags)
+{
+ int error;
+ pgd_t * dir;
+ unsigned long end = address + size;
+
+ phys_addr -= address;
+ dir = pgd_offset(&init_mm, address);
+ flush_cache_all();
+ if (address >= end)
+ BUG();
+ spin_lock(&init_mm.page_table_lock);
+ do {
+ pmd_t *pmd;
+ pmd = pmd_alloc(&init_mm, dir, address);
+ error = -ENOMEM;
+ if (!pmd)
+ break;
+ if (remap_area_pmd(pmd, address, end - address,
+ phys_addr + address, flags))
+ break;
+ error = 0;
+ address = (address + PGDIR_SIZE) & PGDIR_MASK;
+ dir++;
+ } while (address && (address < end));
+ spin_unlock(&init_mm.page_table_lock);
+ flush_tlb_all();
+ return error;
+}
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+ void * addr;
+ struct vm_struct * area;
+ unsigned long offset, last_addr;
+
+ /* Don't allow wraparound or zero size */
+ last_addr = phys_addr + size - 1;
+ if (!size || last_addr < phys_addr)
+ return NULL;
+
+ /*
+ * Mappings have to be page-aligned
+ */
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr+1) - phys_addr;
+
+ /*
+ * Ok, go for it..
+ */
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+ addr = area->addr;
+ if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
+ vfree(addr);
+ return NULL;
+ }
+ return (void *) (offset + (char *)addr);
+}
+
+void iounmap(void *addr)
+{
+ if (addr > high_memory)
+ return vfree((void *) (PAGE_MASK & (unsigned long) addr));
+}
diff --git a/arch/cris/mm/tlb.c b/arch/cris/mm/tlb.c
new file mode 100644
index 00000000000..23eca5ad738
--- /dev/null
+++ b/arch/cris/mm/tlb.c
@@ -0,0 +1,126 @@
+/*
+ * linux/arch/cris/mm/tlb.c
+ *
+ * Copyright (C) 2000, 2001 Axis Communications AB
+ *
+ * Authors: Bjorn Wesen (bjornw@axis.com)
+ *
+ */
+
+#include <linux/init.h>
+#include <asm/tlb.h>
+
+#define D(x)
+
+/* The TLB can host up to 64 different mm contexts at the same time.
+ * The running context is R_MMU_CONTEXT, and each TLB entry contains a
+ * page_id that has to match to give a hit. In page_id_map, we keep track
+ * of which mm's we have assigned which page_id's, so that we know when
+ * to invalidate TLB entries.
+ *
+ * The last page_id is never running - it is used as an invalid page_id
+ * so we can make TLB entries that will never match.
+ *
+ * Notice that we need to make the flushes atomic, otherwise an interrupt
+ * handler that uses vmalloced memory might cause a TLB load in the middle
+ * of a flush causing.
+ */
+
+struct mm_struct *page_id_map[NUM_PAGEID];
+static int map_replace_ptr = 1; /* which page_id_map entry to replace next */
+
+/*
+ * Initialize the context related info for a new mm_struct
+ * instance.
+ */
+
+int
+init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+ mm->context = NO_CONTEXT;
+ return 0;
+}
+
+/* the following functions are similar to those used in the PPC port */
+
+static inline void
+alloc_context(struct mm_struct *mm)
+{
+ struct mm_struct *old_mm;
+
+ D(printk("tlb: alloc context %d (%p)\n", map_replace_ptr, mm));
+
+ /* did we replace an mm ? */
+
+ old_mm = page_id_map[map_replace_ptr];
+
+ if(old_mm) {
+ /* throw out any TLB entries belonging to the mm we replace
+ * in the map
+ */
+ flush_tlb_mm(old_mm);
+
+ old_mm->context = NO_CONTEXT;
+ }
+
+ /* insert it into the page_id_map */
+
+ mm->context = map_replace_ptr;
+ page_id_map[map_replace_ptr] = mm;
+
+ map_replace_ptr++;
+
+ if(map_replace_ptr == INVALID_PAGEID)
+ map_replace_ptr = 0; /* wrap around */
+}
+
+/*
+ * if needed, get a new MMU context for the mm. otherwise nothing is done.
+ */
+
+void
+get_mmu_context(struct mm_struct *mm)
+{
+ if(mm->context == NO_CONTEXT)
+ alloc_context(mm);
+}
+
+/* called by __exit_mm to destroy the used MMU context if any before
+ * destroying the mm itself. this is only called when the last user of the mm
+ * drops it.
+ *
+ * the only thing we really need to do here is mark the used PID slot
+ * as empty.
+ */
+
+void
+destroy_context(struct mm_struct *mm)
+{
+ if(mm->context != NO_CONTEXT) {
+ D(printk("destroy_context %d (%p)\n", mm->context, mm));
+ flush_tlb_mm(mm); /* TODO this might be redundant ? */
+ page_id_map[mm->context] = NULL;
+ /* mm->context = NO_CONTEXT; redundant.. mm will be freed */
+ }
+}
+
+/* called once during VM initialization, from init.c */
+
+void __init
+tlb_init(void)
+{
+ int i;
+
+ /* clear the page_id map */
+
+ for (i = 1; i < sizeof (page_id_map) / sizeof (page_id_map[0]); i++)
+ page_id_map[i] = NULL;
+
+ /* invalidate the entire TLB */
+
+ flush_tlb_all();
+
+ /* the init_mm has context 0 from the boot */
+
+ page_id_map[0] = &init_mm;
+}