diff options
Diffstat (limited to 'arch/m68k/mm/sun3mmu.c')
| -rw-r--r-- | arch/m68k/mm/sun3mmu.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c new file mode 100644 index 0000000000..c5e6a23e02 --- /dev/null +++ b/arch/m68k/mm/sun3mmu.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/m68k/mm/sun3mmu.c + * + * Implementations of mm routines specific to the sun3 MMU. + * + * Moved here 8/20/1999 Sam Creasey + * + */ + +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/memblock.h> + +#include <asm/setup.h> +#include <linux/uaccess.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/io.h> + +extern void mmu_emu_init (unsigned long bootmem_end); + +const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n"; + +extern unsigned long num_pages; + +/* For the sun3 we try to follow the i386 paging_init() more closely */ +/* start_mem and end_mem have PAGE_OFFSET added already */ +/* now sets up tables using sun3 PTEs rather than i386 as before. --m */ +void __init paging_init(void) +{ + pgd_t * pg_dir; + pte_t * pg_table; + int i; + unsigned long address; + unsigned long next_pgtable; + unsigned long bootmem_end; + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, }; + unsigned long size; + + empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!empty_zero_page) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE); + + address = PAGE_OFFSET; + pg_dir = swapper_pg_dir; + memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir)); + memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir)); + + size = num_pages * sizeof(pte_t); + size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1); + + next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE); + if (!next_pgtable) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, size, PAGE_SIZE); + bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK; + + /* Map whole memory from PAGE_OFFSET (0x0E000000) */ + pg_dir += PAGE_OFFSET >> PGDIR_SHIFT; + + while (address < (unsigned long)high_memory) { + pg_table = (pte_t *) __pa (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 */ + pg_table = (pte_t *) __va ((unsigned long) pg_table); + for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) { + pte_t pte = pfn_pte(virt_to_pfn((void *)address), PAGE_INIT); + if (address >= (unsigned long)high_memory) + pte_val (pte) = 0; + set_pte (pg_table, pte); + address += PAGE_SIZE; + } + } + + mmu_emu_init(bootmem_end); + + current->mm = NULL; + + /* memory sizing is a hack stolen from motorola.c.. hope it works for us */ + max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT; + + /* I really wish I knew why the following change made things better... -- Sam */ + free_area_init(max_zone_pfn); + + +} + +static const pgprot_t protection_map[16] = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READONLY, + [VM_WRITE] = PAGE_COPY, + [VM_WRITE | VM_READ] = PAGE_COPY, + [VM_EXEC] = PAGE_READONLY, + [VM_EXEC | VM_READ] = PAGE_READONLY, + [VM_EXEC | VM_WRITE] = PAGE_COPY, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READONLY, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, + [VM_SHARED | VM_EXEC] = PAGE_READONLY, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED +}; +DECLARE_VM_GET_PAGE_PROT |