m68k: ColdFire V4e MMU paging init code and miss handler

The different ColdFire V4e MMU requires its own dedicated paging init
code, and a TLB miss handler for its software driven TLB.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>

1 files changed, 198 insertions, 0 deletions

diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
new file mode 100644
index 000000000000..babd5a97cdcb
--- /dev/null
+++ b/arch/m68k/mm/mcfmmu.c
@@ -0,0 +1,198 @@
+/*
+ * Based upon linux/arch/m68k/mm/sun3mmu.c
+ * Based upon linux/arch/ppc/mm/mmu_context.c
+ *
+ * Implementations of mm routines specific to the Coldfire MMU.
+ *
+ * Copyright (c) 2008 Freescale Semiconductor, Inc.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/bootmem.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/mmu_context.h>
+#include <asm/mcf_pgalloc.h>
+#include <asm/tlbflush.h>
+
+#define KMAPAREA(x)     ((x >= VMALLOC_START) && (x < KMAP_END))
+
+mm_context_t next_mmu_context;
+unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
+atomic_t nr_free_contexts;
+struct mm_struct *context_mm[LAST_CONTEXT+1];
+extern unsigned long num_pages;
+
+void free_initmem(void)
+{
+}
+
+/*
+ * ColdFire paging_init derived from sun3.
+ */
+void __init paging_init(void)
+{
+        pgd_t *pg_dir;
+        pte_t *pg_table;
+        unsigned long address, size;
+        unsigned long next_pgtable, bootmem_end;
+        unsigned long zones_size[MAX_NR_ZONES];
+        enum zone_type zone;
+        int i;
+
+        empty_zero_page = (void *) alloc_bootmem_pages(PAGE_SIZE);
+        memset((void *) empty_zero_page, 0, PAGE_SIZE);
+
+        pg_dir = swapper_pg_dir;
+        memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
+
+        size = num_pages * sizeof(pte_t);
+        size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
+        next_pgtable = (unsigned long) alloc_bootmem_pages(size);
+
+        bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
+        pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
+
+        address = PAGE_OFFSET;
+        while (address < (unsigned long)high_memory) {
+                pg_table = (pte_t *) next_pgtable;
+                next_pgtable += PTRS_PER_PTE * sizeof(pte_t);
+                pgd_val(*pg_dir) = (unsigned long) pg_table;
+                pg_dir++;
+
+                /* now change pg_table to kernel virtual addresses */
+                for (i = 0; i < PTRS_PER_PTE; ++i, ++pg_table) {
+                        pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
+                        if (address >= (unsigned long) high_memory)
+                                pte_val(pte) = 0;
+
+                        set_pte(pg_table, pte);
+                        address += PAGE_SIZE;
+                }
+        }
+
+        current->mm = NULL;
+
+        for (zone = 0; zone < MAX_NR_ZONES; zone++)
+                zones_size[zone] = 0x0;
+        zones_size[ZONE_DMA] = num_pages;
+        free_area_init(zones_size);
+}
+
+int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
+{
+        unsigned long flags, mmuar;
+        struct mm_struct *mm;
+        pgd_t *pgd;
+        pmd_t *pmd;
+        pte_t *pte;
+        int asid;
+
+        local_irq_save(flags);
+
+        mmuar = (dtlb) ? mmu_read(MMUAR) :
+                regs->pc + (extension_word * sizeof(long));
+
+        mm = (!user_mode(regs) && KMAPAREA(mmuar)) ? &init_mm : current->mm;
+        if (!mm) {
+                local_irq_restore(flags);
+                return -1;
+        }
+
+        pgd = pgd_offset(mm, mmuar);
+        if (pgd_none(*pgd))  {
+                local_irq_restore(flags);
+                return -1;
+        }
+
+        pmd = pmd_offset(pgd, mmuar);
+        if (pmd_none(*pmd)) {
+                local_irq_restore(flags);
+                return -1;
+        }
+
+        pte = (KMAPAREA(mmuar)) ? pte_offset_kernel(pmd, mmuar)
+                                : pte_offset_map(pmd, mmuar);
+        if (pte_none(*pte) || !pte_present(*pte)) {
+                local_irq_restore(flags);
+                return -1;
+        }
+
+        if (write) {
+                if (!pte_write(*pte)) {
+                        local_irq_restore(flags);
+                        return -1;
+                }
+                set_pte(pte, pte_mkdirty(*pte));
+        }
+
+        set_pte(pte, pte_mkyoung(*pte));
+        asid = mm->context & 0xff;
+        if (!pte_dirty(*pte) && !KMAPAREA(mmuar))
+                set_pte(pte, pte_wrprotect(*pte));
+
+        mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
+                (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
+                >> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
+
+        mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
+                ((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
+
+        if (dtlb)
+                mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA);
+        else
+                mmu_write(MMUOR, MMUOR_ITLB | MMUOR_ACC | MMUOR_UAA);
+
+        local_irq_restore(flags);
+        return 0;
+}
+
+/*
+ * Initialize the context management stuff.
+ * The following was taken from arch/ppc/mmu_context.c
+ */
+void __init mmu_context_init(void)
+{
+        /*
+         * Some processors have too few contexts to reserve one for
+         * init_mm, and require using context 0 for a normal task.
+         * Other processors reserve the use of context zero for the kernel.
+         * This code assumes FIRST_CONTEXT < 32.
+         */
+        context_map[0] = (1 << FIRST_CONTEXT) - 1;
+        next_mmu_context = FIRST_CONTEXT;
+        atomic_set(&nr_free_contexts, LAST_CONTEXT - FIRST_CONTEXT + 1);
+}
+
+/*
+ * Steal a context from a task that has one at the moment.
+ * This is only used on 8xx and 4xx and we presently assume that
+ * they don't do SMP.  If they do then thicfpgalloc.hs will have to check
+ * whether the MM we steal is in use.
+ * We also assume that this is only used on systems that don't
+ * use an MMU hash table - this is true for 8xx and 4xx.
+ * This isn't an LRU system, it just frees up each context in
+ * turn (sort-of pseudo-random replacement :).  This would be the
+ * place to implement an LRU scheme if anyone was motivated to do it.
+ *  -- paulus
+ */
+void steal_context(void)
+{
+        struct mm_struct *mm;
+        /*
+         * free up context `next_mmu_context'
+         * if we shouldn't free context 0, don't...
+         */
+        if (next_mmu_context < FIRST_CONTEXT)
+                next_mmu_context = FIRST_CONTEXT;
+        mm = context_mm[next_mmu_context];
+        flush_tlb_mm(mm);
+        destroy_context(mm);
+}
+