/*
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/*
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* linux/include/asm-arm/proc-armo/mmap.h
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* linux/include/asm-arm/proc-armo/mmap.h
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*
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*
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* Copyright (C) 1996 Russell King
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* Copyright (C) 1996 Russell King
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*
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*
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* This contains the code to setup the memory map on an ARM2/ARM250/ARM3
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* This contains the code to setup the memory map on an ARM2/ARM250/ARM3
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* machine. This is both processor & architecture specific, and requires
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* machine. This is both processor & architecture specific, and requires
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* some more work to get it to fit into our separate processor and
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* some more work to get it to fit into our separate processor and
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* architecture structure.
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* architecture structure.
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*/
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*/
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static unsigned long phys_screen_end;
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static unsigned long phys_screen_end;
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int page_nr;
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int page_nr;
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#define setup_processor_functions()
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#define setup_processor_functions()
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/*
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/*
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* This routine needs more work to make it dynamically release/allocate mem!
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* This routine needs more work to make it dynamically release/allocate mem!
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*/
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*/
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unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)
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unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)
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{
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{
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static int updated = 0;
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static int updated = 0;
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unsigned long address = SCREEN_START, i;
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unsigned long address = SCREEN_START, i;
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pgd_t *pg_dir;
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pgd_t *pg_dir;
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pmd_t *pm_dir;
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pmd_t *pm_dir;
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pte_t *pt_entry;
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pte_t *pt_entry;
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if (updated)
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if (updated)
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return 0;
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return 0;
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updated = update;
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updated = update;
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pg_dir = swapper_pg_dir + (SCREEN1_BASE >> PGDIR_SHIFT);
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pg_dir = swapper_pg_dir + (SCREEN1_BASE >> PGDIR_SHIFT);
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pm_dir = pmd_offset(pg_dir, SCREEN1_BASE);
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pm_dir = pmd_offset(pg_dir, SCREEN1_BASE);
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pt_entry = pte_offset(pm_dir, SCREEN1_BASE);
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pt_entry = pte_offset(pm_dir, SCREEN1_BASE);
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for (i = SCREEN1_BASE; i < SCREEN1_END; i += PAGE_SIZE) {
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for (i = SCREEN1_BASE; i < SCREEN1_END; i += PAGE_SIZE) {
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if (i >= log_start) {
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if (i >= log_start) {
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*pt_entry = mk_pte(address, __pgprot(_PAGE_PRESENT));
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*pt_entry = mk_pte(address, __pgprot(_PAGE_PRESENT));
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address += PAGE_SIZE;
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address += PAGE_SIZE;
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} else
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} else
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*pt_entry = mk_pte(0, __pgprot(0));
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*pt_entry = mk_pte(0, __pgprot(0));
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pt_entry++;
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pt_entry++;
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}
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}
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phys_screen_end = address;
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phys_screen_end = address;
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if (update)
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if (update)
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flush_tlb_all ();
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flush_tlb_all ();
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return kmem;
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return kmem;
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}
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}
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static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)
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static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)
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{
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{
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unsigned long address;
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unsigned long address;
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unsigned int spi;
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unsigned int spi;
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page_nr = MAP_NR(end_mem);
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page_nr = MAP_NR(end_mem);
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/* Allocate zero page */
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/* Allocate zero page */
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address = PAGE_OFFSET + 480*1024;
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address = PAGE_OFFSET + 480*1024;
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for (spi = 0; spi < 32768 >> PAGE_SHIFT; spi++) {
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for (spi = 0; spi < 32768 >> PAGE_SHIFT; spi++) {
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pgd_val(swapper_pg_dir[spi]) = pte_val(mk_pte(address, PAGE_READONLY));
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pgd_val(swapper_pg_dir[spi]) = pte_val(mk_pte(address, PAGE_READONLY));
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address += PAGE_SIZE;
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address += PAGE_SIZE;
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}
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}
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while (spi < (PAGE_OFFSET >> PGDIR_SHIFT))
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while (spi < (PAGE_OFFSET >> PGDIR_SHIFT))
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pgd_val(swapper_pg_dir[spi++]) = 0;
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pgd_val(swapper_pg_dir[spi++]) = 0;
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map_screen_mem (SCREEN1_END - 480*1024, 0, 0);
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map_screen_mem (SCREEN1_END - 480*1024, 0, 0);
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return start_mem;
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return start_mem;
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}
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}
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static inline void mark_usable_memory_areas(unsigned long *start_mem, unsigned long end_mem)
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static inline void mark_usable_memory_areas(unsigned long *start_mem, unsigned long end_mem)
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{
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{
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unsigned long smem = PAGE_ALIGN(*start_mem);
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unsigned long smem = PAGE_ALIGN(*start_mem);
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while (smem < end_mem) {
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while (smem < end_mem) {
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clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
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clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
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smem += PAGE_SIZE;
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smem += PAGE_SIZE;
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}
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}
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for (smem = phys_screen_end; smem < SCREEN2_END; smem += PAGE_SIZE)
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for (smem = phys_screen_end; smem < SCREEN2_END; smem += PAGE_SIZE)
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clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
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clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
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}
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}
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