diff options
Diffstat (limited to 'arch/arm26/mm/memc.c')
| -rw-r--r-- | arch/arm26/mm/memc.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/arch/arm26/mm/memc.c b/arch/arm26/mm/memc.c deleted file mode 100644 index 42505541a9b1..000000000000 --- a/arch/arm26/mm/memc.c +++ /dev/null @@ -1,184 +0,0 @@ -/* - * linux/arch/arm26/mm/memc.c - * - * Copyright (C) 1998-2000 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Page table sludge for older ARM processor architectures. - */ -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/init.h> -#include <linux/bootmem.h> - -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/page.h> -#include <asm/memory.h> -#include <asm/hardware.h> - -#include <asm/map.h> - -#define MEMC_TABLE_SIZE (256*sizeof(unsigned long)) - -struct kmem_cache *pte_cache, *pgd_cache; -int page_nr; - -/* - * Allocate space for a page table and a MEMC table. - * Note that we place the MEMC - * table before the page directory. This means we can - * easily get to both tightly-associated data structures - * with a single pointer. - */ -static inline pgd_t *alloc_pgd_table(void) -{ - void *pg2k = kmem_cache_alloc(pgd_cache, GFP_KERNEL); - - if (pg2k) - pg2k += MEMC_TABLE_SIZE; - - return (pgd_t *)pg2k; -} - -/* - * Free a page table. this function is the counterpart to get_pgd_slow - * below, not alloc_pgd_table above. - */ -void free_pgd_slow(pgd_t *pgd) -{ - unsigned long tbl = (unsigned long)pgd; - - tbl -= MEMC_TABLE_SIZE; - - kmem_cache_free(pgd_cache, (void *)tbl); -} - -/* - * Allocate a new pgd and fill it in ready for use - * - * A new tasks pgd is completely empty (all pages !present) except for: - * - * o The machine vectors at virtual address 0x0 - * o The vmalloc region at the top of address space - * - */ -#define FIRST_KERNEL_PGD_NR (FIRST_USER_PGD_NR + USER_PTRS_PER_PGD) - -pgd_t *get_pgd_slow(struct mm_struct *mm) -{ - pgd_t *new_pgd, *init_pgd; - pmd_t *new_pmd, *init_pmd; - pte_t *new_pte, *init_pte; - - new_pgd = alloc_pgd_table(); - if (!new_pgd) - goto no_pgd; - - /* - * On ARM, first page must always be allocated since it contains - * the machine vectors. - */ - new_pmd = pmd_alloc(mm, new_pgd, 0); - if (!new_pmd) - goto no_pmd; - - new_pte = pte_alloc_map(mm, new_pmd, 0); - if (!new_pte) - goto no_pte; - - init_pgd = pgd_offset(&init_mm, 0); - init_pmd = pmd_offset(init_pgd, 0); - init_pte = pte_offset(init_pmd, 0); - - set_pte(new_pte, *init_pte); - pte_unmap(new_pte); - - /* - * the page table entries are zeroed - * when the table is created. (see the cache_ctor functions below) - * Now we need to plonk the kernel (vmalloc) area at the end of - * the address space. We copy this from the init thread, just like - * the init_pte we copied above... - */ - memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR, - (PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t)); - - /* update MEMC tables */ - cpu_memc_update_all(new_pgd); - return new_pgd; - -no_pte: - pmd_free(new_pmd); -no_pmd: - free_pgd_slow(new_pgd); -no_pgd: - return NULL; -} - -/* - * No special code is required here. - */ -void setup_mm_for_reboot(char mode) -{ -} - -/* - * This contains the code to setup the memory map on an ARM2/ARM250/ARM3 - * o swapper_pg_dir = 0x0207d000 - * o kernel proper starts at 0x0208000 - * o create (allocate) a pte to contain the machine vectors - * o populate the pte (points to 0x02078000) (FIXME - is it zeroed?) - * o populate the init tasks page directory (pgd) with the new pte - * o zero the rest of the init tasks pgdir (FIXME - what about vmalloc?!) - */ -void __init memtable_init(struct meminfo *mi) -{ - pte_t *pte; - int i; - - page_nr = max_low_pfn; - - pte = alloc_bootmem_low_pages(PTRS_PER_PTE * sizeof(pte_t)); - pte[0] = mk_pte_phys(PAGE_OFFSET + SCREEN_SIZE, PAGE_READONLY); - pmd_populate(&init_mm, pmd_offset(swapper_pg_dir, 0), pte); - - for (i = 1; i < PTRS_PER_PGD; i++) - pgd_val(swapper_pg_dir[i]) = 0; -} - -void __init iotable_init(struct map_desc *io_desc) -{ - /* nothing to do */ -} - -/* - * We never have holes in the memmap - */ -void __init create_memmap_holes(struct meminfo *mi) -{ -} - -static void pte_cache_ctor(void *pte, struct kmem_cache *cache, unsigned long flags) -{ - memzero(pte, sizeof(pte_t) * PTRS_PER_PTE); -} - -static void pgd_cache_ctor(void *pgd, struct kmem_cache *cache, unsigned long flags) -{ - memzero(pgd + MEMC_TABLE_SIZE, USER_PTRS_PER_PGD * sizeof(pgd_t)); -} - -void __init pgtable_cache_init(void) -{ - pte_cache = kmem_cache_create("pte-cache", - sizeof(pte_t) * PTRS_PER_PTE, - 0, SLAB_PANIC, pte_cache_ctor, NULL); - - pgd_cache = kmem_cache_create("pgd-cache", MEMC_TABLE_SIZE + - sizeof(pgd_t) * PTRS_PER_PGD, - 0, SLAB_PANIC, pgd_cache_ctor, NULL); -} |