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/*

 * linux/include/asm-arm/proc-armo/mmap.h

 *

 * Copyright (C) 1996 Russell King

 *

 * This contains the code to setup the memory map on an ARM2/ARM250/ARM3

 * machine. This is both processor & architecture specific, and requires

 * some more work to get it to fit into our separate processor and

 * architecture structure.

 */

static unsigned long phys_screen_end;

int page_nr;

#define setup_processor_functions()

#define PTE_SIZE        (PTRS_PER_PTE * BYTES_PER_PTR)

static inline void setup_swapper_dir (int index, pte_t *ptep)

{

        set_pmd (pmd_offset (swapper_pg_dir + index, 0), mk_pmd (ptep));

}

/*

 * This routine needs more work to make it dynamically release/allocate mem!

 */

unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)

{

        static int updated = 0;

        if (updated)

                return 0;

        updated = update;

        if (update) {

                unsigned long address = log_start, offset;

                pgd_t *pgdp;

                kmem = (kmem + 3) & ~3;

                pgdp = pgd_offset (&init_mm, address);                          /* +31 */

                offset = SCREEN_START;

                while (address < SCREEN1_END) {

                        unsigned long addr_pmd, end_pmd;

                        pmd_t *pmdp;

                        /* if (pgd_none (*pgdp)) alloc pmd */

                        pmdp = pmd_offset (pgdp, address);                      /* +0 */

                        addr_pmd = address & ~PGDIR_MASK;                       /* 088000 */

                        end_pmd = addr_pmd + SCREEN1_END - address;             /* 100000 */

                        if (end_pmd > PGDIR_SIZE)

                                end_pmd = PGDIR_SIZE;

                        do {

                                unsigned long addr_pte, end_pte;

                                pte_t *ptep;

                                if (pmd_none (*pmdp)) {

                                        pte_t *new_pte = (pte_t *)kmem;

                                        kmem += PTRS_PER_PTE * BYTES_PER_PTR;

                                        memzero (new_pte, PTRS_PER_PTE * BYTES_PER_PTR);

                                        set_pmd (pmdp, mk_pmd(new_pte));

                                }

                                ptep = pte_offset (pmdp, addr_pmd);             /* +11 */

                                addr_pte = addr_pmd & ~PMD_MASK;                /* 088000 */

                                end_pte = addr_pte + end_pmd - addr_pmd;        /* 100000 */

                                if (end_pte > PMD_SIZE)

                                        end_pte = PMD_SIZE;

                                do {

                                        set_pte (ptep, mk_pte(offset, PAGE_KERNEL));

                                        addr_pte += PAGE_SIZE;

                                        offset += PAGE_SIZE;

                                        ptep++;

                                } while (addr_pte < end_pte);

                                pmdp++;

                                addr_pmd = (addr_pmd + PMD_SIZE) & PMD_MASK;

                        } while (addr_pmd < end_pmd);

                        address = (address + PGDIR_SIZE) & PGDIR_MASK;

                        pgdp ++;

                }

                phys_screen_end = offset;

                flush_tlb_all ();

                update_mm_cache_all ();

        }

        return kmem;

}

static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)

{

        unsigned int i;

        union {unsigned long l; pte_t *pte; } u;

        page_nr = MAP_NR(end_mem);

        /* map in pages for (0x0000 - 0x8000) */

        u.l = ((start_mem + (PTE_SIZE-1)) & ~(PTE_SIZE-1));

        start_mem = u.l + PTE_SIZE;

        memzero (u.pte, PTE_SIZE);

        u.pte[0] = mk_pte(PAGE_OFFSET + 491520, PAGE_READONLY);

        setup_swapper_dir (0, u.pte);

        for (i = 1; i < PTRS_PER_PGD; i++)

                pgd_val(swapper_pg_dir[i]) = 0;

        /* now map screen mem in */

        phys_screen_end = SCREEN2_END;

        map_screen_mem (SCREEN1_END - 480*1024, 0, 0);

        return start_mem;

}

static inline void mark_usable_memory_areas(unsigned long *start_mem, unsigned long end_mem)

{

        unsigned long smem;

        *start_mem = smem = PAGE_ALIGN(*start_mem);

        while (smem < end_mem) {

                clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);

                smem += PAGE_SIZE;

        }

        for (smem = phys_screen_end; smem < SCREEN2_END; smem += PAGE_SIZE)

                clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);

}