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[hh.org.git] / arch / v850 / kernel / setup.c

/*
 * arch/v850/kernel/setup.c -- Arch-dependent initialization functions
 *
 *  Copyright (C) 2001,02,03,05,06  NEC Electronics Corporation
 *  Copyright (C) 2001,02,03,05,06  Miles Bader <miles@gnu.org>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of this
 * archive for more details.
 *
 * Written by Miles Bader <miles@gnu.org>
 */

#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/swap.h>         /* we don't have swap, but for nr_free_pages */
#include <linux/irq.h>
#include <linux/reboot.h>
#include <linux/personality.h>
#include <linux/major.h>
#include <linux/root_dev.h>
#include <linux/mtd/mtd.h>
#include <linux/init.h>

#include <asm/irq.h>
#include <asm/setup.h>

#include "mach.h"

/* These symbols are all defined in the linker map to delineate various
   statically allocated regions of memory.  */

extern char _intv_start, _intv_end;
/* `kram' is only used if the kernel uses part of normal user RAM.  */
extern char _kram_start __attribute__ ((__weak__));
extern char _kram_end __attribute__ ((__weak__));
extern char _init_start, _init_end;
extern char _bootmap;
extern char _stext, _etext, _sdata, _edata, _sbss, _ebss;
/* Many platforms use an embedded root image.  */
extern char _root_fs_image_start __attribute__ ((__weak__));
extern char _root_fs_image_end __attribute__ ((__weak__));


char command_line[COMMAND_LINE_SIZE];

/* Memory not used by the kernel.  */
static unsigned long total_ram_pages;

/* System RAM.  */
static unsigned long ram_start = 0, ram_len = 0;


#define ADDR_TO_PAGE_UP(x)   ((((unsigned long)x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define ADDR_TO_PAGE(x)      (((unsigned long)x) >> PAGE_SHIFT)
#define PAGE_TO_ADDR(x)      (((unsigned long)x) << PAGE_SHIFT)

static void init_mem_alloc (unsigned long ram_start, unsigned long ram_len);

void set_mem_root (void *addr, size_t len, char *cmd_line);


void __init setup_arch (char **cmdline)
{
        /* Keep a copy of command line */
        *cmdline = command_line;
        memcpy (saved_command_line, command_line, COMMAND_LINE_SIZE);
        saved_command_line[COMMAND_LINE_SIZE - 1] = '\0';

        console_verbose ();

        init_mm.start_code = (unsigned long) &_stext;
        init_mm.end_code = (unsigned long) &_etext;
        init_mm.end_data = (unsigned long) &_edata;
        init_mm.brk = (unsigned long) &_kram_end;

        /* Find out what mem this machine has.  */
        mach_get_physical_ram (&ram_start, &ram_len);
        /* ... and tell the kernel about it.  */
        init_mem_alloc (ram_start, ram_len);

        printk (KERN_INFO "CPU: %s\nPlatform: %s\n",
                CPU_MODEL_LONG, PLATFORM_LONG);

        /* do machine-specific setups.  */
        mach_setup (cmdline);

#ifdef CONFIG_MTD
        if (!ROOT_DEV && &_root_fs_image_end > &_root_fs_image_start)
                set_mem_root (&_root_fs_image_start,
                              &_root_fs_image_end - &_root_fs_image_start,
                              *cmdline);
#endif
}

void __init trap_init (void)
{
}

#ifdef CONFIG_MTD

/* From drivers/mtd/devices/slram.c */
#define SLRAM_BLK_SZ 0x4000

/* Set the root filesystem to be the given memory region.
   Some parameter may be appended to CMD_LINE.  */
void set_mem_root (void *addr, size_t len, char *cmd_line)
{
        /* Some sort of idiocy in MTD means we must supply a length that's
           a multiple of SLRAM_BLK_SZ.  We just round up the real length,
           as the file system shouldn't attempt to access anything beyond
           the end of the image anyway.  */
        len = (((len - 1) + SLRAM_BLK_SZ) / SLRAM_BLK_SZ) * SLRAM_BLK_SZ;

        /* The only way to pass info to the MTD slram driver is via
           the command line.  */
        if (*cmd_line) {
                cmd_line += strlen (cmd_line);
                *cmd_line++ = ' ';
        }
        sprintf (cmd_line, "slram=root,0x%x,+0x%x", (u32)addr, (u32)len);

        ROOT_DEV = MKDEV (MTD_BLOCK_MAJOR, 0);
}
#endif

\f
static void irq_nop (unsigned irq) { }
static unsigned irq_zero (unsigned irq) { return 0; }

static void nmi_end (unsigned irq)
{
        if (irq != IRQ_NMI (0)) {
                printk (KERN_CRIT "NMI %d is unrecoverable; restarting...",
                        irq - IRQ_NMI (0));
                machine_restart (0);
        }
}

static struct hw_interrupt_type nmi_irq_type = {
        .typename = "NMI",
        .startup = irq_zero,            /* startup */
        .shutdown = irq_nop,            /* shutdown */
        .enable = irq_nop,              /* enable */
        .disable = irq_nop,             /* disable */
        .ack = irq_nop,         /* ack */
        .end = nmi_end,         /* end */
};

void __init init_IRQ (void)
{
        init_irq_handlers (0, NUM_MACH_IRQS, 1, 0);
        init_irq_handlers (IRQ_NMI (0), NUM_NMIS, 1, &nmi_irq_type);
        mach_init_irqs ();
}

\f
void __init mem_init (void)
{
        max_mapnr = MAP_NR (ram_start + ram_len);

        num_physpages = ADDR_TO_PAGE (ram_len);

        total_ram_pages = free_all_bootmem ();

        printk (KERN_INFO
                "Memory: %luK/%luK available"
                " (%luK kernel code, %luK data)\n",
                PAGE_TO_ADDR (nr_free_pages()) / 1024,
                ram_len / 1024,
                ((unsigned long)&_etext - (unsigned long)&_stext) / 1024,
                ((unsigned long)&_ebss - (unsigned long)&_sdata) / 1024);
}

void free_initmem (void)
{
        unsigned long ram_end = ram_start + ram_len;
        unsigned long start = PAGE_ALIGN ((unsigned long)(&_init_start));

        if (start >= ram_start && start < ram_end) {
                unsigned long addr;
                unsigned long end = PAGE_ALIGN ((unsigned long)(&_init_end));

                if (end > ram_end)
                        end = ram_end;

                printk("Freeing unused kernel memory: %ldK freed\n",
                       (end - start) / 1024);

                for (addr = start; addr < end; addr += PAGE_SIZE) {
                        struct page *page = virt_to_page (addr);
                        ClearPageReserved (page);
                        init_page_count (page);
                        __free_page (page);
                        total_ram_pages++;
                }
        }
}

\f
/* Initialize the `bootmem allocator'.  RAM_START and RAM_LEN identify
   what RAM may be used.  */
static void __init
init_bootmem_alloc (unsigned long ram_start, unsigned long ram_len)
{
        /* The part of the kernel that's in the same managed RAM space
           used for general allocation.  */
        unsigned long kram_start = (unsigned long)&_kram_start;
        unsigned long kram_end = (unsigned long)&_kram_end;
        /* End of the managed RAM space.  */
        unsigned long ram_end = ram_start + ram_len;
        /* Address range of the interrupt vector table.  */
        unsigned long intv_start = (unsigned long)&_intv_start;
        unsigned long intv_end = (unsigned long)&_intv_end;
        /* True if the interrupt vectors are in the managed RAM area.  */
        int intv_in_ram = (intv_end > ram_start && intv_start < ram_end);
        /* True if the interrupt vectors are inside the kernel's RAM.  */
        int intv_in_kram = (intv_end > kram_start && intv_start < kram_end);
        /* A pointer to an optional function that reserves platform-specific
           memory regions.  We declare the pointer `volatile' to avoid gcc
           turning the call into a static call (the problem is that since
           it's a weak symbol, a static call may end up trying to reference
           the location 0x0, which is not always reachable).  */
        void (*volatile mrb) (void) = mach_reserve_bootmem;
        /* The bootmem allocator's allocation bitmap.  */
        unsigned long bootmap = (unsigned long)&_bootmap;
        unsigned long bootmap_len;

        /* Round bootmap location up to next page.  */
        bootmap = PAGE_TO_ADDR (ADDR_TO_PAGE_UP (bootmap));

        /* Initialize bootmem allocator.  */
        bootmap_len = init_bootmem_node (NODE_DATA (0),
                                         ADDR_TO_PAGE (bootmap),
                                         ADDR_TO_PAGE (PAGE_OFFSET),
                                         ADDR_TO_PAGE (ram_end));

        /* Now make the RAM actually allocatable (it starts out `reserved'). */
        free_bootmem (ram_start, ram_len);

        if (kram_end > kram_start)
                /* Reserve the RAM part of the kernel's address space, so it
                   doesn't get allocated.  */
                reserve_bootmem (kram_start, kram_end - kram_start);
        
        if (intv_in_ram && !intv_in_kram)
                /* Reserve the interrupt vector space.  */
                reserve_bootmem (intv_start, intv_end - intv_start);

        if (bootmap >= ram_start && bootmap < ram_end)
                /* Reserve the bootmap space.  */
                reserve_bootmem (bootmap, bootmap_len);

        /* Reserve the memory used by the root filesystem image if it's
           in RAM.  */
        if (&_root_fs_image_end > &_root_fs_image_start
            && (unsigned long)&_root_fs_image_start >= ram_start
            && (unsigned long)&_root_fs_image_start < ram_end)
                reserve_bootmem ((unsigned long)&_root_fs_image_start,
                                 &_root_fs_image_end - &_root_fs_image_start);

        /* Let the platform-dependent code reserve some too.  */
        if (mrb)
                (*mrb) ();
}

/* Tell the kernel about what RAM it may use for memory allocation.  */
static void __init
init_mem_alloc (unsigned long ram_start, unsigned long ram_len)
{
        unsigned i;
        unsigned long zones_size[MAX_NR_ZONES];

        init_bootmem_alloc (ram_start, ram_len);

        for (i = 0; i < MAX_NR_ZONES; i++)
                zones_size[i] = 0;

        /* We stuff all the memory into one area, which includes the
           initial gap from PAGE_OFFSET to ram_start.  */
        zones_size[ZONE_DMA]
                = ADDR_TO_PAGE (ram_len + (ram_start - PAGE_OFFSET));

        /* The allocator is very picky about the address of the first
           allocatable page -- it must be at least as aligned as the
           maximum allocation -- so try to detect cases where it will get
           confused and signal them at compile time (this is a common
           problem when porting to a new platform with ).  There is a
           similar runtime check in free_area_init_core.  */
#if ((PAGE_OFFSET >> PAGE_SHIFT) & ((1UL << (MAX_ORDER - 1)) - 1))
#error MAX_ORDER is too large for given PAGE_OFFSET (use CONFIG_FORCE_MAX_ZONEORDER to change it)
#endif
        NODE_DATA(0)->node_mem_map = NULL;
        free_area_init_node (0, NODE_DATA(0), zones_size,
                             ADDR_TO_PAGE (PAGE_OFFSET), 0);
}

\f

/* Taken from m68knommu */
void show_mem(void)
{
    unsigned long i;
    int free = 0, total = 0, reserved = 0, shared = 0;
    int cached = 0;

    printk(KERN_INFO "\nMem-info:\n");
    show_free_areas();
    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))
            free++;
        else
            shared += page_count(mem_map+i) - 1;
    }
    printk(KERN_INFO "%d pages of RAM\n",total);
    printk(KERN_INFO "%d free pages\n",free);
    printk(KERN_INFO "%d reserved pages\n",reserved);
    printk(KERN_INFO "%d pages shared\n",shared);
    printk(KERN_INFO "%d pages swap cached\n",cached);
}