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    Subject[PATCH][PPC32] Make PPC40x large tlb mapping optional
    This makes the PPC40x lowmem large tlb mapping selectable via
    a cmdline option. This allows use of the normal page-sized mapping
    so that kernel text can be read only if desired.

    Signed-off-by: Josh Boyer <jwboyer@charter.net>
    Signed-off-by: Matt Porter <mporter@kernel.crashing.org>

    diff -Naur -x '*.swp' linux-2.6.orig/arch/ppc/mm/4xx_mmu.c linux-2.6/arch/ppc/mm/4xx_mmu.c
    --- linux-2.6.orig/arch/ppc/mm/4xx_mmu.c 2004-06-16 00:18:37.000000000 -0500
    +++ linux-2.6/arch/ppc/mm/4xx_mmu.c 2004-08-11 08:25:11.000000000 -0500
    @@ -52,6 +52,7 @@
    #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.
    */
    @@ -102,6 +103,10 @@
    p = PPC_MEMSTART;
    s = 0;

    + if (__map_without_ltlbs) {
    + return s;
    + }
    +
    while (s <= (total_lowmem - LARGE_PAGE_SIZE_16M)) {
    pmd_t *pmdp;
    unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
    diff -Naur -x '*.swp' linux-2.6.orig/arch/ppc/mm/init.c linux-2.6/arch/ppc/mm/init.c
    --- linux-2.6.orig/arch/ppc/mm/init.c 2004-08-11 08:03:55.000000000 -0500
    +++ linux-2.6/arch/ppc/mm/init.c 2004-08-11 08:11:24.000000000 -0500
    @@ -104,6 +104,7 @@
    * -- Cort
    */
    int __map_without_bats;
    +int __map_without_ltlbs;

    /* max amount of RAM to use */
    unsigned long __max_memory;
    @@ -204,6 +205,10 @@
    __map_without_bats = 1;
    }

    + if (strstr(cmd_line, "noltlbs")) {
    + __map_without_ltlbs = 1;
    + }
    +
    /* Look for mem= option on command line */
    if (strstr(cmd_line, "mem=")) {
    char *p, *q;
    -
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