diff options
Diffstat (limited to 'arch/ppc/mm/4xx_mmu.c')
| -rw-r--r-- | arch/ppc/mm/4xx_mmu.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/arch/ppc/mm/4xx_mmu.c b/arch/ppc/mm/4xx_mmu.c deleted file mode 100644 index ea785dbaac7..00000000000 --- a/arch/ppc/mm/4xx_mmu.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - * This file contains the routines for initializing the MMU - * on the 4xx series of chips. - * -- paulus - * - * Derived from arch/ppc/mm/init.c: - * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) - * - * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) - * 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 - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - */ - -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/swap.h> -#include <linux/stddef.h> -#include <linux/vmalloc.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/highmem.h> - -#include <asm/pgalloc.h> -#include <asm/prom.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/bootx.h> -#include <asm/machdep.h> -#include <asm/setup.h> -#include "mmu_decl.h" - -extern int __map_without_ltlbs; -/* - * MMU_init_hw does the chip-specific initialization of the MMU hardware. - */ -void __init MMU_init_hw(void) -{ - /* - * The Zone Protection Register (ZPR) defines how protection will - * be applied to every page which is a member of a given zone. At - * present, we utilize only two of the 4xx's zones. - * The zone index bits (of ZSEL) in the PTE are used for software - * indicators, except the LSB. For user access, zone 1 is used, - * for kernel access, zone 0 is used. We set all but zone 1 - * to zero, allowing only kernel access as indicated in the PTE. - * For zone 1, we set a 01 binary (a value of 10 will not work) - * to allow user access as indicated in the PTE. This also allows - * kernel access as indicated in the PTE. - */ - - mtspr(SPRN_ZPR, 0x10000000); - - flush_instruction_cache(); - - /* - * Set up the real-mode cache parameters for the exception vector - * handlers (which are run in real-mode). - */ - - mtspr(SPRN_DCWR, 0x00000000); /* All caching is write-back */ - - /* - * Cache instruction and data space where the exception - * vectors and the kernel live in real-mode. - */ - - mtspr(SPRN_DCCR, 0xF0000000); /* 512 MB of data space at 0x0. */ - mtspr(SPRN_ICCR, 0xF0000000); /* 512 MB of instr. space at 0x0. */ -} - -#define LARGE_PAGE_SIZE_16M (1<<24) -#define LARGE_PAGE_SIZE_4M (1<<22) - -unsigned long __init mmu_mapin_ram(void) -{ - unsigned long v, s; - phys_addr_t p; - - v = KERNELBASE; - p = PPC_MEMSTART; - s = total_lowmem; - - if (__map_without_ltlbs) - return 0; - - while (s >= LARGE_PAGE_SIZE_16M) { - pmd_t *pmdp; - unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE; - - pmdp = pmd_offset(pgd_offset_k(v), v); - pmd_val(*pmdp++) = val; - pmd_val(*pmdp++) = val; - pmd_val(*pmdp++) = val; - pmd_val(*pmdp++) = val; - - v += LARGE_PAGE_SIZE_16M; - p += LARGE_PAGE_SIZE_16M; - s -= LARGE_PAGE_SIZE_16M; - } - - while (s >= LARGE_PAGE_SIZE_4M) { - pmd_t *pmdp; - unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE; - - pmdp = pmd_offset(pgd_offset_k(v), v); - pmd_val(*pmdp) = val; - - v += LARGE_PAGE_SIZE_4M; - p += LARGE_PAGE_SIZE_4M; - s -= LARGE_PAGE_SIZE_4M; - } - - return total_lowmem - s; -} |