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/*

 * linux/include/asm-arm/proc-armv/mm-init.h

 *

 * Copyright (C) 1996 Russell King

 *

 * This contains the code to setup the memory map on an ARM v3 or v4 machine.

 * This is both processor & architecture specific, and requires some

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

 * structure.

 */

/*

 * On ebsa, we want the memory map set up so:

 *

 *   PHYS         VIRT

 * 00000000     00000000        Zero page

 * 000003ff     000003ff        Zero page end

 * 00000000     c0000000        Kernel and all physical memory

 * 01ffffff     c1ffffff        End of physical (32MB)

 * e0000000     e0000000        IO start

 * ffffffff     ffffffff        IO end

 *

 * On rpc, we want:

 *

 *   PHYS         VIRT

 * 10000000     00000000        Zero page

 * 100003ff     000003ff        Zero page end

 * 10000000     c0000000        Kernel and all physical memory

 * 1fffffff     cfffffff        End of physical (32MB)

 * 02000000     d?000000        Screen memory (first image)

 * 02000000     d8000000        Screen memory (second image)

 * 00000000     df000000        StrongARM cache invalidation area

 * 03000000     e0000000        IO start

 * 03ffffff     e0ffffff        IO end

 *

 * We set it up using the section page table entries.

 */

#include <asm/arch/mmap.h>

#include <asm/pgtable.h>

#define V2P(x)  __virt_to_phys(x)

#define PTE_SIZE (PTRS_PER_PTE * 4)

#define PMD_SECT        (PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) | PMD_SECT_CACHEABLE)

static inline void setup_swapper_dir (int index, unsigned long entry)

{

        pmd_t pmd;

        pmd_val(pmd) = entry;

        set_pmd (pmd_offset (swapper_pg_dir + index, 0), pmd);

}

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

{

        unsigned long address;

        unsigned int spi;

        union { unsigned long l; unsigned long *p; } u;

        /* map in zero page */

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

        start_mem = u.l + PTE_SIZE;

        memzero (u.p, PTE_SIZE);

        *u.p = V2P(PAGE_OFFSET) | PTE_CACHEABLE | PTE_TYPE_SMALL | PTE_AP_WRITE;

        setup_swapper_dir (0, V2P(u.l) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL));

        for (spi = 1; spi < (PAGE_OFFSET >> PGDIR_SHIFT); spi++)

                pgd_val(swapper_pg_dir[spi]) = 0;

        /* map in physical ram & kernel */

        address = PAGE_OFFSET;

        while (spi < end_mem >> PGDIR_SHIFT) {

                setup_swapper_dir (spi++,

                                V2P(address) | PMD_SECT |

                                PMD_SECT_BUFFERABLE | PMD_SECT_AP_WRITE);

                address += PGDIR_SIZE;

        }

        while (spi < PTRS_PER_PGD)

                pgd_val(swapper_pg_dir[spi++]) = 0;

        /*

         * An area to invalidate the cache

         */

        setup_swapper_dir (0xdf0, SAFE_ADDR | PMD_SECT | PMD_SECT_AP_READ);

        /* map in IO */

        address = IO_START;

        spi = IO_BASE >> PGDIR_SHIFT;

        while (address - IO_START < IO_SIZE && address) {

                pgd_val(swapper_pg_dir[spi++]) = address |

                                                PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) |

                                                PMD_SECT_AP_WRITE;

                address += PGDIR_SIZE;

        }

#ifdef EASI_BASE

        /* map in IO */

        address = EASI_START;

        spi = EASI_BASE >> PGDIR_SHIFT;

        while (address < EASI_START + EASI_SIZE && address) {

                pgd_val(swapper_pg_dir[spi++]) = address |

                                                PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) |

                                                PMD_SECT_AP_WRITE;

                address += PGDIR_SIZE;

        }

#endif

#ifdef HAVE_MAP_VID_MEM

        map_screen_mem(0, 0, 0);

#endif

        flush_cache_all();

        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;

        }

}