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/* $Id: init.c,v 1.1.1.1 2004-04-15 01:17:15 phoenix Exp $

 *

 *  linux/arch/sh/mm/init.c

 *

 *  Copyright (C) 1999  Niibe Yutaka

 *

 *  Based on linux/arch/i386/mm/init.c:

 *   Copyright (C) 1995  Linus Torvalds

 */

#include <linux/config.h>

#include <linux/signal.h>

#include <linux/sched.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/types.h>

#include <linux/ptrace.h>

#include <linux/mman.h>

#include <linux/mm.h>

#include <linux/swap.h>

#include <linux/smp.h>

#include <linux/init.h>

#ifdef CONFIG_BLK_DEV_INITRD

#include <linux/blk.h>

#endif

#include <linux/highmem.h>

#include <linux/bootmem.h>

#include <asm/processor.h>

#include <asm/system.h>

#include <asm/uaccess.h>

#include <asm/pgtable.h>

#include <asm/pgalloc.h>

#include <asm/mmu_context.h>

#include <asm/io.h>

#include <asm/tlb.h>

mmu_gather_t mmu_gathers[NR_CPUS];

/*

 * Cache of MMU context last used.

 */

unsigned long mmu_context_cache;

#ifdef CONFIG_DISCONTIGMEM

pg_data_t discontig_page_data[NR_NODES];

bootmem_data_t discontig_node_bdata[NR_NODES];

#endif

static unsigned long totalram_pages;

static unsigned long totalhigh_pages;

void show_mem(void)

{

        int i, total = 0, reserved = 0;

        int shared = 0, cached = 0;

        printk("Mem-info:\n");

        show_free_areas();

        printk("Free swap:       %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));

        i = max_mapnr;

        while (i-- > 0) {

                total++;

                if (PageReserved(mem_map+i))

                        reserved++;

                else if (PageSwapCache(mem_map+i))

                        cached++;

                else if (page_count(mem_map+i))

                        shared += page_count(mem_map+i) - 1;

        }

        printk("%d pages of RAM\n",total);

        printk("%d reserved pages\n",reserved);

        printk("%d pages shared\n",shared);

        printk("%d pages swap cached\n",cached);

        show_buffers();

}

/* References to section boundaries */

extern char _text, _etext, _edata, __bss_start, _end;

extern char __init_begin, __init_end;

pgd_t swapper_pg_dir[PTRS_PER_PGD];

/* It'd be good if these lines were in the standard header file. */

#define START_PFN       (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)

#define MAX_LOW_PFN     (NODE_DATA(0)->bdata->node_low_pfn)

/*

 * paging_init() sets up the page tables

 *

 * This routines also unmaps the page at virtual kernel address 0, so

 * that we can trap those pesky NULL-reference errors in the kernel.

 */

void __init paging_init(void)

{

        int i;

        pgd_t * pg_dir;

        /* We don't need kernel mapping as hardware support that. */

        pg_dir = swapper_pg_dir;

        for (i=0; i < PTRS_PER_PGD; i++)

                pgd_val(pg_dir[i]) = 0;

        /* Enable MMU */

        ctrl_outl(MMU_CONTROL_INIT, MMUCR);

        /* The manual suggests doing some nops after turning on the MMU */

        asm volatile("nop;nop;nop;nop;nop;nop;");

        mmu_context_cache = MMU_CONTEXT_FIRST_VERSION;

        set_asid(mmu_context_cache & MMU_CONTEXT_ASID_MASK);

        {

                unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};

                unsigned long max_dma, low, start_pfn;

                start_pfn = START_PFN;

                max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;

                low = MAX_LOW_PFN;

                if (low < max_dma)

                        zones_size[ZONE_DMA] = low - start_pfn;

                else {

                        zones_size[ZONE_DMA] = max_dma - start_pfn;

                        zones_size[ZONE_NORMAL] = low - max_dma;

                }

                free_area_init_node(0, NODE_DATA(0), 0, zones_size, __MEMORY_START, 0);

#ifdef CONFIG_DISCONTIGMEM

                zones_size[ZONE_DMA] = __MEMORY_SIZE_2ND >> PAGE_SHIFT;

                zones_size[ZONE_NORMAL] = 0;

                free_area_init_node(1, NODE_DATA(1), 0, zones_size, __MEMORY_START_2ND, 0);

#endif

        }

}

void __init mem_init(void)

{

        extern unsigned long empty_zero_page[1024];

        int codesize, reservedpages, datasize, bsssize, initsize, pagemapsize;

        int tmp;

        max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;

        high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);

        /* clear the zero-page */

        memset(empty_zero_page, 0, PAGE_SIZE);

        __flush_wback_region(empty_zero_page, PAGE_SIZE);

        /* this will put all low memory onto the freelists */

        totalram_pages += free_all_bootmem_node(NODE_DATA(0));

#ifdef CONFIG_DISCONTIGMEM

        totalram_pages += free_all_bootmem_node(NODE_DATA(1));

#endif

        reservedpages = 0;

        for (tmp = 0; tmp < num_physpages; tmp++)

                /*

                 * Only count reserved RAM pages

                 */

                if (PageReserved(mem_map+tmp))

                        reservedpages++;

        codesize =  (unsigned long) &_etext - (unsigned long) &_text;

        datasize =  (unsigned long) &_edata - (unsigned long) &_etext;

        bsssize  =  (unsigned long) &_end - (unsigned long) &__bss_start;

        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

        pagemapsize = (max_mapnr + 1)*sizeof(struct page);

        printk("Memory: %luk/%luk available (%dk reserved including: %dk kernel code, %dk data, %dk BSS, %dk init, %dk page map)\n",

               (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),

               max_mapnr << (PAGE_SHIFT-10),

               reservedpages << (PAGE_SHIFT-10),

               codesize >> 10,

               datasize >> 10,

               bsssize >> 10,

               initsize >> 10,

               pagemapsize >> 10);

        p3_cache_init();

}

void free_initmem(void)

{

        unsigned long addr;

        addr = (unsigned long)(&__init_begin);

        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {

                ClearPageReserved(virt_to_page(addr));

                set_page_count(virt_to_page(addr), 1);

                free_page(addr);

                totalram_pages++;

        }

        printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);

}

#ifdef CONFIG_BLK_DEV_INITRD

void free_initrd_mem(unsigned long start, unsigned long end)

{

        unsigned long p;

        for (p = start; p < end; p += PAGE_SIZE) {

                ClearPageReserved(virt_to_page(p));

                set_page_count(virt_to_page(p), 1);

                free_page(p);

                totalram_pages++;

        }

        printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);

}

#endif

void si_meminfo(struct sysinfo *val)

{

        val->totalram = totalram_pages;

        val->sharedram = 0;

        val->freeram = nr_free_pages();

        val->bufferram = atomic_read(&buffermem_pages);

        val->totalhigh = totalhigh_pages;

        val->freehigh = nr_free_highpages();

        val->mem_unit = PAGE_SIZE;

        return;

}