mmu.c (7961239599de71130c852ecfa9a4140f3f60547b) mmu.c (be370302742ff9948f2a42b15cb2ba174d97b930)
1/*
2 * linux/arch/arm/mm/mmu.c
3 *
4 * Copyright (C) 1995-2005 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.

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822 * memory bank, up to the end of the vmalloc region.
823 */
824 for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0]));
825 addr < VMALLOC_END; addr += PGDIR_SIZE)
826 pmd_clear(pmd_off_k(addr));
827}
828
829/*
1/*
2 * linux/arch/arm/mm/mmu.c
3 *
4 * Copyright (C) 1995-2005 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.

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822 * memory bank, up to the end of the vmalloc region.
823 */
824 for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0]));
825 addr < VMALLOC_END; addr += PGDIR_SIZE)
826 pmd_clear(pmd_off_k(addr));
827}
828
829/*
830 * Reserve the various regions of node 0
830 * Reserve the various regions
831 */
831 */
832void __init reserve_node_zero(pg_data_t *pgdat)
832void __init reserve_special_regions(void)
833{
834 unsigned long res_size = 0;
835
836 /*
837 * Register the kernel text and data with bootmem.
838 * Note that this can only be in node 0.
839 */
840#ifdef CONFIG_XIP_KERNEL
833{
834 unsigned long res_size = 0;
835
836 /*
837 * Register the kernel text and data with bootmem.
838 * Note that this can only be in node 0.
839 */
840#ifdef CONFIG_XIP_KERNEL
841 reserve_bootmem_node(pgdat, __pa(_data), _end - _data,
842 BOOTMEM_DEFAULT);
841 reserve_bootmem(__pa(_data), _end - _data, BOOTMEM_DEFAULT);
843#else
842#else
844 reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext,
845 BOOTMEM_DEFAULT);
843 reserve_bootmem(__pa(_stext), _end - _stext, BOOTMEM_DEFAULT);
846#endif
847
848 /*
849 * Reserve the page tables. These are already in use,
850 * and can only be in node 0.
851 */
844#endif
845
846 /*
847 * Reserve the page tables. These are already in use,
848 * and can only be in node 0.
849 */
852 reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
853 PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT);
850 reserve_bootmem(__pa(swapper_pg_dir),
851 PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT);
854
855 /*
856 * Hmm... This should go elsewhere, but we really really need to
857 * stop things allocating the low memory; ideally we need a better
858 * implementation of GFP_DMA which does not assume that DMA-able
859 * memory starts at zero.
860 */
861 if (machine_is_integrator() || machine_is_cintegrator())

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869 res_size = 0x00020000;
870 if (machine_is_p720t())
871 res_size = 0x00014000;
872
873 /* H1940, RX3715 and RX1950 need to reserve this for suspend */
874
875 if (machine_is_h1940() || machine_is_rx3715()
876 || machine_is_rx1950()) {
852
853 /*
854 * Hmm... This should go elsewhere, but we really really need to
855 * stop things allocating the low memory; ideally we need a better
856 * implementation of GFP_DMA which does not assume that DMA-able
857 * memory starts at zero.
858 */
859 if (machine_is_integrator() || machine_is_cintegrator())

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867 res_size = 0x00020000;
868 if (machine_is_p720t())
869 res_size = 0x00014000;
870
871 /* H1940, RX3715 and RX1950 need to reserve this for suspend */
872
873 if (machine_is_h1940() || machine_is_rx3715()
874 || machine_is_rx1950()) {
877 reserve_bootmem_node(pgdat, 0x30003000, 0x1000,
878 BOOTMEM_DEFAULT);
879 reserve_bootmem_node(pgdat, 0x30081000, 0x1000,
880 BOOTMEM_DEFAULT);
875 reserve_bootmem(0x30003000, 0x1000, BOOTMEM_DEFAULT);
876 reserve_bootmem(0x30081000, 0x1000, BOOTMEM_DEFAULT);
881 }
882
883 if (machine_is_palmld() || machine_is_palmtx()) {
877 }
878
879 if (machine_is_palmld() || machine_is_palmtx()) {
884 reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
885 BOOTMEM_EXCLUSIVE);
886 reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
887 BOOTMEM_EXCLUSIVE);
880 reserve_bootmem(0xa0000000, 0x1000, BOOTMEM_EXCLUSIVE);
881 reserve_bootmem(0xa0200000, 0x1000, BOOTMEM_EXCLUSIVE);
888 }
889
890 if (machine_is_treo680() || machine_is_centro()) {
882 }
883
884 if (machine_is_treo680() || machine_is_centro()) {
891 reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
892 BOOTMEM_EXCLUSIVE);
893 reserve_bootmem_node(pgdat, 0xa2000000, 0x1000,
894 BOOTMEM_EXCLUSIVE);
885 reserve_bootmem(0xa0000000, 0x1000, BOOTMEM_EXCLUSIVE);
886 reserve_bootmem(0xa2000000, 0x1000, BOOTMEM_EXCLUSIVE);
895 }
896
897 if (machine_is_palmt5())
887 }
888
889 if (machine_is_palmt5())
898 reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
899 BOOTMEM_EXCLUSIVE);
890 reserve_bootmem(0xa0200000, 0x1000, BOOTMEM_EXCLUSIVE);
900
901 /*
902 * U300 - This platform family can share physical memory
903 * between two ARM cpus, one running Linux and the other
904 * running another OS.
905 */
906 if (machine_is_u300()) {
907#ifdef CONFIG_MACH_U300_SINGLE_RAM

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915#ifdef CONFIG_SA1111
916 /*
917 * Because of the SA1111 DMA bug, we want to preserve our
918 * precious DMA-able memory...
919 */
920 res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
921#endif
922 if (res_size)
891
892 /*
893 * U300 - This platform family can share physical memory
894 * between two ARM cpus, one running Linux and the other
895 * running another OS.
896 */
897 if (machine_is_u300()) {
898#ifdef CONFIG_MACH_U300_SINGLE_RAM

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906#ifdef CONFIG_SA1111
907 /*
908 * Because of the SA1111 DMA bug, we want to preserve our
909 * precious DMA-able memory...
910 */
911 res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
912#endif
913 if (res_size)
923 reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size,
924 BOOTMEM_DEFAULT);
914 reserve_bootmem(PHYS_OFFSET, res_size, BOOTMEM_DEFAULT);
925}
926
927/*
928 * Set up device the mappings. Since we clear out the page tables for all
929 * mappings above VMALLOC_END, we will remove any debug device mappings.
930 * This means you have to be careful how you debug this function, or any
931 * called function. This means you can't use any function or debugging
932 * method which may touch any device, otherwise the kernel _will_ crash.

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916
917/*
918 * Set up device the mappings. Since we clear out the page tables for all
919 * mappings above VMALLOC_END, we will remove any debug device mappings.
920 * This means you have to be careful how you debug this function, or any
921 * called function. This means you can't use any function or debugging
922 * method which may touch any device, otherwise the kernel _will_ crash.

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