[ARM] Split ARM MM initialisation for !mmu
Move the MMU specific code from init.c into mmu.c, and add nommu fixups to nommu.c Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
Russell King
Родитель
456335e207
Коммит
d111e8f964
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@ -6,7 +6,7 @@ obj-y := consistent.o extable.o fault.o init.o \
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iomap.o
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obj-$(CONFIG_MMU) += fault-armv.o flush.o ioremap.o mmap.o \
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mm-armv.o
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mm-armv.o mmu.o
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ifneq ($(CONFIG_MMU),y)
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obj-y += nommu.o
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@ -27,10 +27,7 @@
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#include "mm.h"
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end;
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extern void _text, _etext, __data_start, _end, __init_begin, __init_end;
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extern unsigned long phys_initrd_start;
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extern unsigned long phys_initrd_size;
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@ -40,17 +37,6 @@ extern unsigned long phys_initrd_size;
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*/
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static struct meminfo meminfo __initdata = { 0, };
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/*
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* empty_zero_page is a special page that is used for
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* zero-initialized data and COW.
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*/
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struct page *empty_zero_page;
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/*
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* The pmd table for the upper-most set of pages.
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*/
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pmd_t *top_pmd;
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void show_mem(void)
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{
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int free = 0, total = 0, reserved = 0;
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@ -173,87 +159,9 @@ static int __init check_initrd(struct meminfo *mi)
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return initrd_node;
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}
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/*
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* Reserve the various regions of node 0
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*/
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static __init void reserve_node_zero(pg_data_t *pgdat)
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{
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unsigned long res_size = 0;
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/*
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* Register the kernel text and data with bootmem.
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* Note that this can only be in node 0.
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*/
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#ifdef CONFIG_XIP_KERNEL
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reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
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#else
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reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
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#endif
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/*
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* Reserve the page tables. These are already in use,
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* and can only be in node 0.
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*/
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reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
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PTRS_PER_PGD * sizeof(pgd_t));
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/*
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* Hmm... This should go elsewhere, but we really really need to
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* stop things allocating the low memory; ideally we need a better
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* implementation of GFP_DMA which does not assume that DMA-able
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* memory starts at zero.
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*/
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if (machine_is_integrator() || machine_is_cintegrator())
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res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
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/*
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* These should likewise go elsewhere. They pre-reserve the
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* screen memory region at the start of main system memory.
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*/
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if (machine_is_edb7211())
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res_size = 0x00020000;
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if (machine_is_p720t())
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res_size = 0x00014000;
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#ifdef CONFIG_SA1111
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/*
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* Because of the SA1111 DMA bug, we want to preserve our
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* precious DMA-able memory...
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*/
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res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
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#endif
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if (res_size)
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reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
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}
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static inline void prepare_page_table(struct meminfo *mi)
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{
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unsigned long addr;
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/*
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* Clear out all the mappings below the kernel image.
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*/
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for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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#ifdef CONFIG_XIP_KERNEL
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/* The XIP kernel is mapped in the module area -- skip over it */
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addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
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#endif
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for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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/*
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* Clear out all the kernel space mappings, except for the first
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* memory bank, up to the end of the vmalloc region.
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*/
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for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
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addr < VMALLOC_END; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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}
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static inline void map_memory_bank(struct membank *bank)
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{
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#ifdef CONFIG_MMU
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struct map_desc map;
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map.pfn = __phys_to_pfn(bank->start);
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@ -262,6 +170,7 @@ static inline void map_memory_bank(struct membank *bank)
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map.type = MT_MEMORY;
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create_mapping(&map);
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#endif
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}
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static unsigned long __init
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@ -373,7 +282,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
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return end_pfn;
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}
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static void __init bootmem_init(struct meminfo *mi)
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void __init bootmem_init(struct meminfo *mi)
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{
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unsigned long memend_pfn = 0;
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int node, initrd_node, i;
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@ -387,8 +296,6 @@ static void __init bootmem_init(struct meminfo *mi)
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memcpy(&meminfo, mi, sizeof(meminfo));
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prepare_page_table(mi);
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/*
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* Locate which node contains the ramdisk image, if any.
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*/
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@ -422,114 +329,6 @@ static void __init bootmem_init(struct meminfo *mi)
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max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
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}
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/*
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* Set up device the mappings. Since we clear out the page tables for all
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* mappings above VMALLOC_END, we will remove any debug device mappings.
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* This means you have to be careful how you debug this function, or any
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* called function. This means you can't use any function or debugging
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* method which may touch any device, otherwise the kernel _will_ crash.
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*/
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static void __init devicemaps_init(struct machine_desc *mdesc)
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{
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struct map_desc map;
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unsigned long addr;
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void *vectors;
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/*
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* Allocate the vector page early.
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*/
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vectors = alloc_bootmem_low_pages(PAGE_SIZE);
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BUG_ON(!vectors);
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for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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/*
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* Map the kernel if it is XIP.
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* It is always first in the modulearea.
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*/
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#ifdef CONFIG_XIP_KERNEL
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map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
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map.virtual = MODULE_START;
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map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
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map.type = MT_ROM;
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create_mapping(&map);
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#endif
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/*
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* Map the cache flushing regions.
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*/
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#ifdef FLUSH_BASE
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map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
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map.virtual = FLUSH_BASE;
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map.length = SZ_1M;
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map.type = MT_CACHECLEAN;
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create_mapping(&map);
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#endif
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#ifdef FLUSH_BASE_MINICACHE
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map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
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map.virtual = FLUSH_BASE_MINICACHE;
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map.length = SZ_1M;
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map.type = MT_MINICLEAN;
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create_mapping(&map);
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#endif
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/*
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* Create a mapping for the machine vectors at the high-vectors
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* location (0xffff0000). If we aren't using high-vectors, also
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* create a mapping at the low-vectors virtual address.
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*/
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map.pfn = __phys_to_pfn(virt_to_phys(vectors));
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map.virtual = 0xffff0000;
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map.length = PAGE_SIZE;
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map.type = MT_HIGH_VECTORS;
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create_mapping(&map);
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if (!vectors_high()) {
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map.virtual = 0;
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map.type = MT_LOW_VECTORS;
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create_mapping(&map);
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}
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/*
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* Ask the machine support to map in the statically mapped devices.
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*/
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if (mdesc->map_io)
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mdesc->map_io();
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/*
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* Finally flush the caches and tlb to ensure that we're in a
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* consistent state wrt the writebuffer. This also ensures that
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* any write-allocated cache lines in the vector page are written
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* back. After this point, we can start to touch devices again.
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*/
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local_flush_tlb_all();
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flush_cache_all();
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}
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/*
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* paging_init() sets up the page tables, initialises the zone memory
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* maps, and sets up the zero page, bad page and bad page tables.
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*/
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void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
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{
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void *zero_page;
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build_mem_type_table();
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bootmem_init(mi);
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devicemaps_init(mdesc);
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top_pmd = pmd_off_k(0xffff0000);
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/*
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* allocate the zero page. Note that we count on this going ok.
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*/
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zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
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memzero(zero_page, PAGE_SIZE);
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empty_zero_page = virt_to_page(zero_page);
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flush_dcache_page(empty_zero_page);
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}
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static inline void free_area(unsigned long addr, unsigned long end, char *s)
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{
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unsigned int size = (end - addr) >> 10;
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@ -14,6 +14,10 @@ static inline pmd_t *pmd_off_k(unsigned long virt)
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}
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struct map_desc;
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struct meminfo;
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struct pglist_data;
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void __init build_mem_type_table(void);
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void __init create_mapping(struct map_desc *md);
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void __init bootmem_init(struct meminfo *mi);
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void reserve_node_zero(struct pglist_data *pgdat);
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@ -0,0 +1,229 @@
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/*
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* linux/arch/arm/mm/mmu.c
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*
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* Copyright (C) 1995-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <asm/mach-types.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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extern void _stext, __data_start, _end;
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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/*
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* empty_zero_page is a special page that is used for
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* zero-initialized data and COW.
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*/
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struct page *empty_zero_page;
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/*
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* The pmd table for the upper-most set of pages.
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*/
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pmd_t *top_pmd;
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static inline void prepare_page_table(struct meminfo *mi)
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{
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unsigned long addr;
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/*
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* Clear out all the mappings below the kernel image.
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*/
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for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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#ifdef CONFIG_XIP_KERNEL
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/* The XIP kernel is mapped in the module area -- skip over it */
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addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
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#endif
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for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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/*
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* Clear out all the kernel space mappings, except for the first
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* memory bank, up to the end of the vmalloc region.
|
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*/
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for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
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addr < VMALLOC_END; addr += PGDIR_SIZE)
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pmd_clear(pmd_off_k(addr));
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}
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/*
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* Reserve the various regions of node 0
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*/
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void __init reserve_node_zero(pg_data_t *pgdat)
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{
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unsigned long res_size = 0;
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/*
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* Register the kernel text and data with bootmem.
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* Note that this can only be in node 0.
|
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*/
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#ifdef CONFIG_XIP_KERNEL
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reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
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#else
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reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
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#endif
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/*
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* Reserve the page tables. These are already in use,
|
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* and can only be in node 0.
|
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*/
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reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
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PTRS_PER_PGD * sizeof(pgd_t));
|
||||
|
||||
/*
|
||||
* Hmm... This should go elsewhere, but we really really need to
|
||||
* stop things allocating the low memory; ideally we need a better
|
||||
* implementation of GFP_DMA which does not assume that DMA-able
|
||||
* memory starts at zero.
|
||||
*/
|
||||
if (machine_is_integrator() || machine_is_cintegrator())
|
||||
res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
|
||||
|
||||
/*
|
||||
* These should likewise go elsewhere. They pre-reserve the
|
||||
* screen memory region at the start of main system memory.
|
||||
*/
|
||||
if (machine_is_edb7211())
|
||||
res_size = 0x00020000;
|
||||
if (machine_is_p720t())
|
||||
res_size = 0x00014000;
|
||||
|
||||
#ifdef CONFIG_SA1111
|
||||
/*
|
||||
* Because of the SA1111 DMA bug, we want to preserve our
|
||||
* precious DMA-able memory...
|
||||
*/
|
||||
res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
|
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#endif
|
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if (res_size)
|
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reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
|
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}
|
||||
|
||||
/*
|
||||
* Set up device the mappings. Since we clear out the page tables for all
|
||||
* mappings above VMALLOC_END, we will remove any debug device mappings.
|
||||
* This means you have to be careful how you debug this function, or any
|
||||
* called function. This means you can't use any function or debugging
|
||||
* method which may touch any device, otherwise the kernel _will_ crash.
|
||||
*/
|
||||
static void __init devicemaps_init(struct machine_desc *mdesc)
|
||||
{
|
||||
struct map_desc map;
|
||||
unsigned long addr;
|
||||
void *vectors;
|
||||
|
||||
/*
|
||||
* Allocate the vector page early.
|
||||
*/
|
||||
vectors = alloc_bootmem_low_pages(PAGE_SIZE);
|
||||
BUG_ON(!vectors);
|
||||
|
||||
for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
|
||||
pmd_clear(pmd_off_k(addr));
|
||||
|
||||
/*
|
||||
* Map the kernel if it is XIP.
|
||||
* It is always first in the modulearea.
|
||||
*/
|
||||
#ifdef CONFIG_XIP_KERNEL
|
||||
map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
|
||||
map.virtual = MODULE_START;
|
||||
map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
|
||||
map.type = MT_ROM;
|
||||
create_mapping(&map);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Map the cache flushing regions.
|
||||
*/
|
||||
#ifdef FLUSH_BASE
|
||||
map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
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||||
map.virtual = FLUSH_BASE;
|
||||
map.length = SZ_1M;
|
||||
map.type = MT_CACHECLEAN;
|
||||
create_mapping(&map);
|
||||
#endif
|
||||
#ifdef FLUSH_BASE_MINICACHE
|
||||
map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
|
||||
map.virtual = FLUSH_BASE_MINICACHE;
|
||||
map.length = SZ_1M;
|
||||
map.type = MT_MINICLEAN;
|
||||
create_mapping(&map);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Create a mapping for the machine vectors at the high-vectors
|
||||
* location (0xffff0000). If we aren't using high-vectors, also
|
||||
* create a mapping at the low-vectors virtual address.
|
||||
*/
|
||||
map.pfn = __phys_to_pfn(virt_to_phys(vectors));
|
||||
map.virtual = 0xffff0000;
|
||||
map.length = PAGE_SIZE;
|
||||
map.type = MT_HIGH_VECTORS;
|
||||
create_mapping(&map);
|
||||
|
||||
if (!vectors_high()) {
|
||||
map.virtual = 0;
|
||||
map.type = MT_LOW_VECTORS;
|
||||
create_mapping(&map);
|
||||
}
|
||||
|
||||
/*
|
||||
* Ask the machine support to map in the statically mapped devices.
|
||||
*/
|
||||
if (mdesc->map_io)
|
||||
mdesc->map_io();
|
||||
|
||||
/*
|
||||
* Finally flush the caches and tlb to ensure that we're in a
|
||||
* consistent state wrt the writebuffer. This also ensures that
|
||||
* any write-allocated cache lines in the vector page are written
|
||||
* back. After this point, we can start to touch devices again.
|
||||
*/
|
||||
local_flush_tlb_all();
|
||||
flush_cache_all();
|
||||
}
|
||||
|
||||
/*
|
||||
* paging_init() sets up the page tables, initialises the zone memory
|
||||
* maps, and sets up the zero page, bad page and bad page tables.
|
||||
*/
|
||||
void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
|
||||
{
|
||||
void *zero_page;
|
||||
|
||||
build_mem_type_table();
|
||||
prepare_page_table(mi);
|
||||
bootmem_init(mi);
|
||||
devicemaps_init(mdesc);
|
||||
|
||||
top_pmd = pmd_off_k(0xffff0000);
|
||||
|
||||
/*
|
||||
* allocate the zero page. Note that we count on this going ok.
|
||||
*/
|
||||
zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
|
||||
memzero(zero_page, PAGE_SIZE);
|
||||
empty_zero_page = virt_to_page(zero_page);
|
||||
flush_dcache_page(empty_zero_page);
|
||||
}
|
||||
|
|
@ -11,6 +11,42 @@
|
|||
#include <asm/io.h>
|
||||
#include <asm/page.h>
|
||||
|
||||
#include "mm.h"
|
||||
|
||||
extern void _stext, __data_start, _end;
|
||||
|
||||
/*
|
||||
* Reserve the various regions of node 0
|
||||
*/
|
||||
void __init reserve_node_zero(pg_data_t *pgdat)
|
||||
{
|
||||
/*
|
||||
* Register the kernel text and data with bootmem.
|
||||
* Note that this can only be in node 0.
|
||||
*/
|
||||
#ifdef CONFIG_XIP_KERNEL
|
||||
reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
|
||||
#else
|
||||
reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Register the exception vector page.
|
||||
* some architectures which the DRAM is the exception vector to trap,
|
||||
* alloc_page breaks with error, although it is not NULL, but "0."
|
||||
*/
|
||||
reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE);
|
||||
}
|
||||
|
||||
/*
|
||||
* paging_init() sets up the page tables, initialises the zone memory
|
||||
* maps, and sets up the zero page, bad page and bad page tables.
|
||||
*/
|
||||
void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
|
||||
{
|
||||
bootmem_init(mi);
|
||||
}
|
||||
|
||||
void flush_dcache_page(struct page *page)
|
||||
{
|
||||
__cpuc_flush_dcache_page(page_address(page));
|
||||
|
|
|
|||
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