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/*
 *  linux/mm/kmalloc.c
 *
 *  Copyright (C) 1994, 1995, 1996 R.M.King, ???, Linus Torvalds
 *
 * Changelog:
 *  4/1/96      RMK     Changed allocation sizes to suite requested
 *                      sizes.  On i386, and other 4k page machines,
 *                      it should use a around 2/3 of the memory
 *                      that it used to.
 *                      Allowed recursive mallocing for machines with
 *                      rediculously large page sizes to reduce
 *                      memory wastage.
 */
 
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/dma.h>
 
/*
 *
 * A study of the sizes requested of kmalloc in v1.3.35 shows the following pattern:
 *
 *                      Req.            ------- Allocd -------
 * Size   Times req.    Total(B)        size     Total   Pages          Wastage
 *   16          7        112             32       224     1              16
 *   36          3        108             64       192     1              28
 *   56         22       1232             64      1408     1               8
 *   68          3        204            128       384     1              60
 *  128         26       3328            256      6656     2               0
 *  512          5       2560           1020      5100     2             508
 *  516          4       2064           1020      4080     1             504
 *  752          4       3008           1020      4080     1             268
 * 1024          1       1024           2040      1024     1               0
 * 1060          4       4240           2040      8160     2             980
 * 2048          2       4096           4080      8160     2            2032
 * 2956          1       2956           4080      4080     1            1124
 * 4096          8      32768           8176     65408    16            4080
 * ---------------------------------------------------------------------------
 *      TOTALS          57700                   108956    32
 *                                                      (128k)
 *
 * On average, the old kmalloc uses twice the amount of memory required with a
 * page size of 4k.  On 32k (which is what I'm dealing with):
 *
 *                      Req.            ------- Allocd -------
 * Size   Times req.    Total(B)        size     Total   Pages          Wastage
 *   16          7        112             32       224     1               8
 *   36          3        108             64       192     1              20
 *   56         22       1232             64      1408     1               0
 *   68          3        204            128       384     1              52
 *  128         26       3328            256      6656     1             120
 *  512          5       2560           1020      5100     2             500
 *  516          4       2064           1020      4080     1             496
 *  752          4       3008           1020      4080     1             260
 * 1024          1       1024           2040      1024     1               0
 * 1060          4       4240           2040      8160     2             972
 * 2048          2       4096           4080      8160     2            2026
 * 2956          1       2956           4080      4080     1            1116
 * 4096          8      32768           8176     65408     2            4072
 * ---------------------------------------------------------------------------
 *      TOTALS          57700                   108956    17
 *                                                      (544k)
 *
 * Using the old kmalloc system, this ate up a lot of memory in the rounding
 * up of the sizes.
 * We now use a similar strategy to the old kmalloc, except we allocate in
 * sizes determined by looking at the use of kmalloc.  There is an overhead of
 * 2 words on each malloc for mallocs private data, and 4 words at the beginning
 * of the page/4k block.
 *
 *                      Req.            ------ Allocd --(pages)
 * Size   Times req.    Total(B)        size    total   4k  32k         wastage
 *   16          7        112             24      168    1                 0
 *   36          3        108             48      144    1                 0
 *   56         22       1232             64     1408    1                 0
 *   68          3        204             80      240    1                 4
 *  128         26       3328            136     3536    1                 0
 *  512          5       2560            580     2900    1   2            60
 *  516          4       2064            580     2320    1                56
 *  752          4       3008            816     3264    1                56
 * 1024          1       1024           1360     1360    1               328
 * 1060          4       4240           1360     5440    2              2048
 * 2048          2       4096           4096     8192    2              1140
 * 2956          1       2956           4096     4096    1                20
 * 4096          8      32768           4676    37408   10   2           582
 * --------------------------------------------------------------------------
 *      TOTALS          57700                   70476   24   4
 *                                                    (96k) (128k)
 *
 */
 
#define MF_USED  0xffaa0055
#define MF_DMA   0xff00aa55
#define MF_FREE  0x0055ffaa
#define MF_INUSE 0x00ff55aa
 
#define PAGE_MALLOC 4096
 
#undef DEBUG
 
struct mblk_header {
        unsigned long mb_flags;
        union {
                unsigned long vmb_size;
                struct mblk_header *vmb_next;
        } v;
};
#define mb_size v.vmb_size
#define mb_next v.vmb_next
 
struct page_header {
        unsigned long       ph_flags;
        struct page_header *ph_next;
        struct mblk_header *ph_free;
        unsigned char       ph_order;
        unsigned char       ph_dma;
        unsigned short      ph_nfree;
};
 
struct size_descriptor {
        struct page_header *sd_firstfree;
        struct page_header *sd_dmafree;
        struct page_header *sd_used;
        int sd_size;
        int sd_blocks;
 
        int sd_gfporder;
};
 
static unsigned long bytes_wanted, bytes_malloced, pages_malloced;
/*
 * These are more suited to the sizes that the kernel will claim.
 * Note the two main ones for 56 and 128 bytes (64 and 136), which
 * get the most use.  gfporder has special values:
 *  -1 = don't get a free page, but malloc a small page.
 */
static struct size_descriptor sizes[32] = {
        { NULL, NULL, NULL,     24, 170, -1 }, /* was 32 - shrink so that we have more */
#if 1
        { NULL, NULL, NULL,     48,  85, -1 }, /* was 64 - shrink so that we have more, however... */
#endif
        { NULL, NULL, NULL,     64,  63, -1 }, /* contains 56 byte mallocs */
#if 1
        { NULL, NULL, NULL,     80,  51. -1 }, /* contains 68 byte mallocs + room for expansion */
#endif
        { NULL, NULL, NULL,    136,  30, -1 }, /* was 128 - swallow up 128B */
        { NULL, NULL, NULL,    580,   7, -1 }, /* was 512 - swallow up 516B and allow for expansion */
        { NULL, NULL, NULL,    816,   5, -1 }, /* was 1024 - we get an extra block */
        { NULL, NULL, NULL,   1360,   3, -1 }, /* was 2048 - we get an extra block */
        { NULL, NULL, NULL,   4096,   7, 0 }, /* we need this one for mallocing 4k */
        { NULL, NULL, NULL,   4676,   7, 0 },
        { NULL, NULL, NULL,   8188,   4, 0 },
        { NULL, NULL, NULL,  16368,   2, 0 },
        { NULL, NULL, NULL,  32752,   1, 0 },
        { NULL, NULL, NULL,  65520,   1, 1 },
        { NULL, NULL, NULL, 131056,   1, 2 },
        { NULL, NULL, NULL, 262128,   1, 3 },
        { NULL, NULL, NULL,      0,   0, 0 },
};
 
static int num_sizes = 32;
 
static inline int get_order (size_t size)
{
        int order;
 
        for (order = 0; sizes[order].sd_size; order ++)
                if (size <= sizes[order].sd_size && sizes[order].sd_gfporder != -3)
                        return order;
        return -1;
}
 
long kmalloc_init (long start_mem, long end_mem)
{
    int i, gfporder, errors = 0;
    /*
     * kmalloc_init is now a bit more intelligent.
     *
     * It now sets up the gfp orders.
     */
#ifndef PAGE_MALLOC
    gfporder = 0;
#else
    gfporder = -1;
#endif
    pages_malloced = bytes_wanted = bytes_malloced = 0;
 
    for (i = 0; i < num_sizes && sizes[i].sd_size; i++) {
        sizes[i].sd_firstfree = NULL;
        sizes[i].sd_dmafree = NULL;
        sizes[i].sd_used = NULL;
        if (gfporder >= 0 && sizes[i].sd_size > (PAGE_SIZE << gfporder))
            gfporder += 1;
#ifdef PAGE_MALLOC
        if (gfporder < 0 && sizes[i].sd_size >= PAGE_MALLOC)
            gfporder += 1;
        if (gfporder < 0)
            sizes[i].sd_blocks = (PAGE_MALLOC - sizeof(struct page_header)) / sizes[i].sd_size;
        else
#endif
            sizes[i].sd_blocks = ((PAGE_SIZE << gfporder) - sizeof(struct page_header)) /
                                        sizes[i].sd_size;
        sizes[i].sd_gfporder = gfporder;
    }
 
    for (i = 0; i < num_sizes && sizes[i].sd_size; i++) {
#ifdef PAGE_MALLOC
        if (sizes[i].sd_gfporder < 0) {
            if ((sizes[i].sd_size * sizes[i].sd_blocks + sizeof (struct page_header))
                <= PAGE_MALLOC)
                continue;
        } else
#endif
        {
            if ((sizes[i].sd_size * sizes[i].sd_blocks + sizeof (struct page_header))
                <= (PAGE_SIZE << sizes[i].sd_gfporder))
                continue;
        }
        printk ("Cannot use order %d (size %d, blocks %d)\n", i, sizes[i].sd_size, sizes[i].sd_blocks);
        errors ++;
    }
    if (errors)
        panic ("This only happens when someone messes with kmalloc");
 
    return start_mem;
}
 
/*
 * kmalloc of any size.
 *
 * if size < PAGE_MALLOC, then when we get a PAGE_MALLOC size, we malloc a
 * PAGE_MALLOC block and override the malloc header with our own.
 */
void *kmalloc (size_t size, int priority)
{
    int dma_flag, order, i;
    unsigned long flags;
    struct page_header *ph, **php;
    struct mblk_header *mb;
    struct size_descriptor *sz;
 
#ifdef DEBUG
    printk (KERN_DEBUG "km: s %4d ", size);
#endif
 
    {
        unsigned int realsize = size + sizeof (struct mblk_header);
 
        order = 0;
        sz = sizes;
        do {
            if (realsize <= sz->sd_size)
                break;
            order ++;
            sz ++;
            if (!sz->sd_size) {
                printk ("\n" KERN_ERR "kmalloc of too large a block (%d bytes).\n", (int) size);
                return NULL;
            }
        } while (1);
    }
#ifdef DEBUG
    printk ("o %2d ", order);
#endif
 
    dma_flag = priority & GFP_DMA;
    priority &= GFP_LEVEL_MASK;
 
    /* Sanity check... */
    if (intr_count && priority != GFP_ATOMIC) {
        static int count = 0;
        if (++count < 5)
            printk ("\n" KERN_ERR "kmalloc called non-atomically from interrupt %p\n",
                __builtin_return_address(0));
        priority = GFP_ATOMIC;
    }
 
    save_flags_cli (flags);
 
    php = dma_flag ? &sz->sd_dmafree : &sz->sd_firstfree;
again:
    ph = *php;
    if (!ph)
        goto no_free_page;
#ifdef DEBUG
    printk ("ph %p n %p f %p ", ph, ph->ph_next, ph->ph_free);
#endif
 
    if (ph->ph_flags != MF_INUSE)
        goto major_problem;
 
    if ((mb = ph->ph_free) != NULL) {
        if (mb->mb_flags != MF_FREE)
            goto major_problem_2;
        ph->ph_free = mb->mb_next;
        if (--ph->ph_nfree == 0) {
#ifdef DEBUG
            printk ("nxp %p n %p f %p\n"KERN_DEBUG"    ", ph, ph->ph_next, ph->ph_free);
#endif
            *php = ph->ph_next;
            ph->ph_next = sz->sd_used;
            sz->sd_used = ph;
        }
        mb->mb_flags = MF_USED;
        mb->mb_size = size;
        bytes_wanted += size;
        bytes_malloced += sz->sd_size;
        restore_flags (flags);
#ifdef DEBUG
        printk (" -> %p malloced\n", mb);
#endif
        return mb + 1; /* increments past header */
    } else {
        printk ("\n" KERN_CRIT
                "kmalloc: problem: page %p has null free pointer - "
                "discarding page (pc=%p)\n", ph,
                __builtin_return_address(0));
        if (ph != ph->ph_next)
            *php = ph->ph_next;
        else
            *php = NULL;
        goto again;
    }
no_free_page:
    restore_flags (flags);
 
    /* We need to get a new 4k page.  Whether we get a new page or malloc 4k depends on
     * the page size
     */
#ifdef PAGE_MALLOC
    if (sz->sd_gfporder < 0) { /* malloc it */
#ifdef DEBUG
        printk ("nsp:\n" KERN_DEBUG "  ");
#endif
        mb = kmalloc (PAGE_MALLOC - sizeof (struct mblk_header), priority | dma_flag);
        /*
         * override malloc header with our own.  This means that we
         * destroy the size entry.  However, we change the flags entry
         * so that a free won't free it without the blocks inside it
         * are freed, and the data put back as it was.
         */
        if (mb)
            ph = (struct page_header *) (mb - 1);
        else
            ph = NULL;
#ifdef DEBUG
        printk (KERN_DEBUG);
#endif
    } else
#endif
    {
        unsigned long max_addr;
 
        max_addr = dma_flag ? MAX_DMA_ADDRESS : ~0UL;
#ifdef DEBUG
        printk ("nlp:\n" KERN_DEBUG "  ");
#endif
        ph = (struct page_header *) __get_free_pages (priority, sz->sd_gfporder, max_addr);
        if (ph)
            pages_malloced += PAGE_SIZE;
    }
 
    if (!ph) {
        static unsigned long last = 0;
        if (priority != GFP_BUFFER && (last + 10*HZ) < jiffies) {
            last = jiffies;
            printk ("\n" KERN_CRIT "kmalloc: couldn't get a free page.....\n");
        }
        return NULL;
    }
    ph->ph_flags = MF_INUSE;
    ph->ph_order = order;
    ph->ph_nfree = sz->sd_blocks;
    ph->ph_dma   = dma_flag;
 
    for (i = sz->sd_blocks, mb = (struct mblk_header *)(ph + 1); i  > 1;
                                i --, mb = mb->mb_next) {
        mb->mb_flags = MF_FREE;
        mb->mb_next = (struct mblk_header *) (((unsigned long)mb) + sz->sd_size);
    }
    ph->ph_free = (struct mblk_header *)(ph + 1);
    mb->mb_flags = MF_FREE;
    mb->mb_next = NULL;
 
    cli();
#ifdef DEBUG
    printk ("New page %p, next %p\n" KERN_DEBUG "                ", ph, *php);
#endif
    ph->ph_next = *php;
    *php = ph;
    goto again;
 
major_problem_2:
#ifdef DEBUG
    printk ("\n\nmb->flags = %08lX\n", mb->mb_flags);
#endif
    panic ("kmalloc: problem: block %p on freelist %p isn't free (pc=%p)\n",
        ph->ph_free, ph, __builtin_return_address(0));
major_problem:
    panic ("kmalloc: problem: page %p in freelist isn't real (pc=%p)\n",
        ph, __builtin_return_address(0));
}
 
void kfree (void *ptr)
{
    int order, size;
    unsigned long flags;
    struct page_header *ph;
    struct mblk_header *mb;
 
    mb = ((struct mblk_header *)ptr) - 1;
 
    if (mb->mb_flags != MF_USED) {
        printk (KERN_ERR "kfree of non-kmalloc'd memory: %p\n", ptr);
        return;
    }
    size = mb->mb_size;
    order = get_order (size + sizeof(struct mblk_header));
 
    if (order < 0) {
        printk (KERN_ERR "kfree of non-kmalloc'd memory: %p,"
                " size %d, order %d (pc=%p)\n", ptr, size, order, __builtin_return_address(0));
        return;
    }
 
#ifdef PAGE_MALLOC
    if (sizes[order].sd_gfporder < 0)
        ph = (struct page_header *) ((((unsigned long) mb) & ~(PAGE_MALLOC - 1)) +
                sizeof (struct page_header));
    else
#endif
        ph = (struct page_header *) (((unsigned long) mb) & PAGE_MASK);
#ifdef DEBUG
    printk (KERN_DEBUG "kfree: page starts at %p\n", ph);
#endif
 
    if (ph->ph_flags != MF_INUSE && ph->ph_order != order) {
        printk (KERN_ERR "kfree of non-kmalloc'd memory: %p,"
                " size %d, order %d (pc=%p)\n", ptr, size, order, __builtin_return_address(0));
        return;
    }
 
    mb->mb_flags = MF_FREE;
    save_flags (flags);
    cli ();
    bytes_wanted -= size;
    bytes_malloced -= sizes[order].sd_size;
    mb->mb_next = ph->ph_free;
    ph->ph_free = mb;
 
    if (++ph->ph_nfree == 1) {
        /*
         * Page went from full to one free block: put it on the free list.
         */
        struct page_header *pp;
 
        if (sizes[order].sd_used == ph)
            sizes[order].sd_used = ph->ph_next;
        else {
            for (pp = sizes[order].sd_used; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);
 
            if (pp->ph_next == ph)
                pp->ph_next = ph->ph_next;
            else {
                printk (KERN_ERR "kfree: page %p not found on used list (pc=%p)\n", ph,
                        __builtin_return_address(0));
                restore_flags (flags);
                return;
            }
        }
 
        ph->ph_next = sizes[order].sd_firstfree;
        sizes[order].sd_firstfree = ph;
    }
 
    if (ph->ph_nfree == sizes[order].sd_blocks) {
        if (sizes[order].sd_firstfree == ph)
            sizes[order].sd_firstfree = ph->ph_next;
        else if (sizes[order].sd_dmafree == ph)
            sizes[order].sd_dmafree = ph->ph_next;
        else {
            struct page_header *pp;
 
            for (pp = sizes[order].sd_firstfree; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);
 
            if (pp == NULL)
                for (pp = sizes[order].sd_dmafree; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);
 
            if (pp)
                pp->ph_next = ph->ph_next;
            else
                printk (KERN_ERR "Oops.  Page %p not found on free list\n", ph);
        }
        restore_flags (flags);
 
#ifdef PAGE_MALLOC
        if (sizes[order].sd_gfporder < 0) {
            mb = (struct mblk_header *)ph;
            mb->mb_flags = MF_USED;
            mb->mb_size = PAGE_MALLOC - sizeof (struct mblk_header);
            kfree (mb + 1);
        } else
#endif
        {
            pages_malloced -= PAGE_SIZE;
            free_pages ((unsigned long)ph, sizes[order].sd_gfporder);
        }
    }
}
 
 
void kmalloc_stats (void)
{
    printk ("kmalloc usage: %ld bytes requested of malloc, %ld actually malloced, %ld bytes claimed\n", bytes_wanted,
                bytes_malloced, pages_malloced);
}
 

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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [armnommu/] [mm/] [kmalloc-arm.c] - Blame information for rev 1782

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/mm/kmalloc.c`
3			`*`
4			`* Copyright (C) 1994, 1995, 1996 R.M.King, ???, Linus Torvalds`
5			`*`
6			`* Changelog:`
7			`* 4/1/96 RMK Changed allocation sizes to suite requested`
8			`* sizes. On i386, and other 4k page machines,`
9			`* it should use a around 2/3 of the memory`
10			`* that it used to.`
11			`* Allowed recursive mallocing for machines with`
12			`* rediculously large page sizes to reduce`
13			`* memory wastage.`
14			`*/`
15
16			`#include <linux/mm.h>`
17			`#include <linux/delay.h>`
18			`#include <linux/interrupt.h>`
19			`#include <asm/system.h>`
20			`#include <asm/dma.h>`
21
22			`/*`
23			`*`
24			`* A study of the sizes requested of kmalloc in v1.3.35 shows the following pattern:`
25			`*`
26			`* Req. ------- Allocd -------`
27			`* Size Times req. Total(B) size Total Pages Wastage`
28			`* 16 7 112 32 224 1 16`
29			`* 36 3 108 64 192 1 28`
30			`* 56 22 1232 64 1408 1 8`
31			`* 68 3 204 128 384 1 60`
32			`* 128 26 3328 256 6656 2 0`
33			`* 512 5 2560 1020 5100 2 508`
34			`* 516 4 2064 1020 4080 1 504`
35			`* 752 4 3008 1020 4080 1 268`
36			`* 1024 1 1024 2040 1024 1 0`
37			`* 1060 4 4240 2040 8160 2 980`
38			`* 2048 2 4096 4080 8160 2 2032`
39			`* 2956 1 2956 4080 4080 1 1124`
40			`* 4096 8 32768 8176 65408 16 4080`
41			`* ---------------------------------------------------------------------------`
42			`* TOTALS 57700 108956 32`
43			`* (128k)`
44			`*`
45			`* On average, the old kmalloc uses twice the amount of memory required with a`
46			`* page size of 4k. On 32k (which is what I'm dealing with):`
47			`*`
48			`* Req. ------- Allocd -------`
49			`* Size Times req. Total(B) size Total Pages Wastage`
50			`* 16 7 112 32 224 1 8`
51			`* 36 3 108 64 192 1 20`
52			`* 56 22 1232 64 1408 1 0`
53			`* 68 3 204 128 384 1 52`
54			`* 128 26 3328 256 6656 1 120`
55			`* 512 5 2560 1020 5100 2 500`
56			`* 516 4 2064 1020 4080 1 496`
57			`* 752 4 3008 1020 4080 1 260`
58			`* 1024 1 1024 2040 1024 1 0`
59			`* 1060 4 4240 2040 8160 2 972`
60			`* 2048 2 4096 4080 8160 2 2026`
61			`* 2956 1 2956 4080 4080 1 1116`
62			`* 4096 8 32768 8176 65408 2 4072`
63			`* ---------------------------------------------------------------------------`
64			`* TOTALS 57700 108956 17`
65			`* (544k)`
66			`*`
67			`* Using the old kmalloc system, this ate up a lot of memory in the rounding`
68			`* up of the sizes.`
69			`* We now use a similar strategy to the old kmalloc, except we allocate in`
70			`* sizes determined by looking at the use of kmalloc. There is an overhead of`
71			`* 2 words on each malloc for mallocs private data, and 4 words at the beginning`
72			`* of the page/4k block.`
73			`*`
74			`* Req. ------ Allocd --(pages)`
75			`* Size Times req. Total(B) size total 4k 32k wastage`
76			`* 16 7 112 24 168 1 0`
77			`* 36 3 108 48 144 1 0`
78			`* 56 22 1232 64 1408 1 0`
79			`* 68 3 204 80 240 1 4`
80			`* 128 26 3328 136 3536 1 0`
81			`* 512 5 2560 580 2900 1 2 60`
82			`* 516 4 2064 580 2320 1 56`
83			`* 752 4 3008 816 3264 1 56`
84			`* 1024 1 1024 1360 1360 1 328`
85			`* 1060 4 4240 1360 5440 2 2048`
86			`* 2048 2 4096 4096 8192 2 1140`
87			`* 2956 1 2956 4096 4096 1 20`
88			`* 4096 8 32768 4676 37408 10 2 582`
89			`* --------------------------------------------------------------------------`
90			`* TOTALS 57700 70476 24 4`
91			`* (96k) (128k)`
92			`*`
93			`*/`
94
95			`#define MF_USED 0xffaa0055`
96			`#define MF_DMA 0xff00aa55`
97			`#define MF_FREE 0x0055ffaa`
98			`#define MF_INUSE 0x00ff55aa`
99
100			`#define PAGE_MALLOC 4096`
101
102			`#undef DEBUG`
103
104			`struct mblk_header {`
105			`unsigned long mb_flags;`
106			`union {`
107			`unsigned long vmb_size;`
108			`struct mblk_header *vmb_next;`
109			`} v;`
110			`};`
111			`#define mb_size v.vmb_size`
112			`#define mb_next v.vmb_next`
113
114			`struct page_header {`
115			`unsigned long ph_flags;`
116			`struct page_header *ph_next;`
117			`struct mblk_header *ph_free;`
118			`unsigned char ph_order;`
119			`unsigned char ph_dma;`
120			`unsigned short ph_nfree;`
121			`};`
122
123			`struct size_descriptor {`
124			`struct page_header *sd_firstfree;`
125			`struct page_header *sd_dmafree;`
126			`struct page_header *sd_used;`
127			`int sd_size;`
128			`int sd_blocks;`
129
130			`int sd_gfporder;`
131			`};`
132
133			`static unsigned long bytes_wanted, bytes_malloced, pages_malloced;`
134			`/*`
135			`* These are more suited to the sizes that the kernel will claim.`
136			`* Note the two main ones for 56 and 128 bytes (64 and 136), which`
137			`* get the most use. gfporder has special values:`
138			`* -1 = don't get a free page, but malloc a small page.`
139			`*/`
140			`static struct size_descriptor sizes[32] = {`
141			`{ NULL, NULL, NULL, 24, 170, -1 }, /* was 32 - shrink so that we have more */`
142			`#if 1`
143			`{ NULL, NULL, NULL, 48, 85, -1 }, /* was 64 - shrink so that we have more, however... */`
144			`#endif`
145			`{ NULL, NULL, NULL, 64, 63, -1 }, /* contains 56 byte mallocs */`
146			`#if 1`
147			`{ NULL, NULL, NULL, 80, 51. -1 }, /* contains 68 byte mallocs + room for expansion */`
148			`#endif`
149			`{ NULL, NULL, NULL, 136, 30, -1 }, /* was 128 - swallow up 128B */`
150			`{ NULL, NULL, NULL, 580, 7, -1 }, /* was 512 - swallow up 516B and allow for expansion */`
151			`{ NULL, NULL, NULL, 816, 5, -1 }, /* was 1024 - we get an extra block */`
152			`{ NULL, NULL, NULL, 1360, 3, -1 }, /* was 2048 - we get an extra block */`
153			`{ NULL, NULL, NULL, 4096, 7, 0 }, /* we need this one for mallocing 4k */`
154			`{ NULL, NULL, NULL, 4676, 7, 0 },`
155			`{ NULL, NULL, NULL, 8188, 4, 0 },`
156			`{ NULL, NULL, NULL, 16368, 2, 0 },`
157			`{ NULL, NULL, NULL, 32752, 1, 0 },`
158			`{ NULL, NULL, NULL, 65520, 1, 1 },`
159			`{ NULL, NULL, NULL, 131056, 1, 2 },`
160			`{ NULL, NULL, NULL, 262128, 1, 3 },`
161			`{ NULL, NULL, NULL, 0, 0, 0 },`
162			`};`
163
164			`static int num_sizes = 32;`
165
166			`static inline int get_order (size_t size)`
167			`{`
168			`int order;`
169
170			`for (order = 0; sizes[order].sd_size; order ++)`
171			`if (size <= sizes[order].sd_size && sizes[order].sd_gfporder != -3)`
172			`return order;`
173			`return -1;`
174			`}`
175
176			`long kmalloc_init (long start_mem, long end_mem)`
177			`{`
178			`int i, gfporder, errors = 0;`
179			`/*`
180			`* kmalloc_init is now a bit more intelligent.`
181			`*`
182			`* It now sets up the gfp orders.`
183			`*/`
184			`#ifndef PAGE_MALLOC`
185			`gfporder = 0;`
186			`#else`
187			`gfporder = -1;`
188			`#endif`
189			`pages_malloced = bytes_wanted = bytes_malloced = 0;`
190
191			`for (i = 0; i < num_sizes && sizes[i].sd_size; i++) {`
192			`sizes[i].sd_firstfree = NULL;`
193			`sizes[i].sd_dmafree = NULL;`
194			`sizes[i].sd_used = NULL;`
195			`if (gfporder >= 0 && sizes[i].sd_size > (PAGE_SIZE << gfporder))`
196			`gfporder += 1;`
197			`#ifdef PAGE_MALLOC`
198			`if (gfporder < 0 && sizes[i].sd_size >= PAGE_MALLOC)`
199			`gfporder += 1;`
200			`if (gfporder < 0)`
201			`sizes[i].sd_blocks = (PAGE_MALLOC - sizeof(struct page_header)) / sizes[i].sd_size;`
202			`else`
203			`#endif`
204			`sizes[i].sd_blocks = ((PAGE_SIZE << gfporder) - sizeof(struct page_header)) /`
205			`sizes[i].sd_size;`
206			`sizes[i].sd_gfporder = gfporder;`
207			`}`
208
209			`for (i = 0; i < num_sizes && sizes[i].sd_size; i++) {`
210			`#ifdef PAGE_MALLOC`
211			`if (sizes[i].sd_gfporder < 0) {`
212			`if ((sizes[i].sd_size * sizes[i].sd_blocks + sizeof (struct page_header))`
213			`<= PAGE_MALLOC)`
214			`continue;`
215			`} else`
216			`#endif`
217			`{`
218			`if ((sizes[i].sd_size * sizes[i].sd_blocks + sizeof (struct page_header))`
219			`<= (PAGE_SIZE << sizes[i].sd_gfporder))`
220			`continue;`
221			`}`
222			`printk ("Cannot use order %d (size %d, blocks %d)\n", i, sizes[i].sd_size, sizes[i].sd_blocks);`
223			`errors ++;`
224			`}`
225			`if (errors)`
226			`panic ("This only happens when someone messes with kmalloc");`
227
228			`return start_mem;`
229			`}`
230
231			`/*`
232			`* kmalloc of any size.`
233			`*`
234			`* if size < PAGE_MALLOC, then when we get a PAGE_MALLOC size, we malloc a`
235			`* PAGE_MALLOC block and override the malloc header with our own.`
236			`*/`
237			`void *kmalloc (size_t size, int priority)`
238			`{`
239			`int dma_flag, order, i;`
240			`unsigned long flags;`
241			`struct page_header ph, *php;`
242			`struct mblk_header *mb;`
243			`struct size_descriptor *sz;`
244
245			`#ifdef DEBUG`
246			`printk (KERN_DEBUG "km: s %4d ", size);`
247			`#endif`
248
249			`{`
250			`unsigned int realsize = size + sizeof (struct mblk_header);`
251
252			`order = 0;`
253			`sz = sizes;`
254			`do {`
255			`if (realsize <= sz->sd_size)`
256			`break;`
257			`order ++;`
258			`sz ++;`
259			`if (!sz->sd_size) {`
260			`printk ("\n" KERN_ERR "kmalloc of too large a block (%d bytes).\n", (int) size);`
261			`return NULL;`
262			`}`
263			`} while (1);`
264			`}`
265			`#ifdef DEBUG`
266			`printk ("o %2d ", order);`
267			`#endif`
268
269			`dma_flag = priority & GFP_DMA;`
270			`priority &= GFP_LEVEL_MASK;`
271
272			`/* Sanity check... */`
273			`if (intr_count && priority != GFP_ATOMIC) {`
274			`static int count = 0;`
275			`if (++count < 5)`
276			`printk ("\n" KERN_ERR "kmalloc called non-atomically from interrupt %p\n",`
277			`__builtin_return_address(0));`
278			`priority = GFP_ATOMIC;`
279			`}`
280
281			`save_flags_cli (flags);`
282
283			`php = dma_flag ? &sz->sd_dmafree : &sz->sd_firstfree;`
284			`again:`
285			`ph = *php;`
286			`if (!ph)`
287			`goto no_free_page;`
288			`#ifdef DEBUG`
289			`printk ("ph %p n %p f %p ", ph, ph->ph_next, ph->ph_free);`
290			`#endif`
291
292			`if (ph->ph_flags != MF_INUSE)`
293			`goto major_problem;`
294
295			`if ((mb = ph->ph_free) != NULL) {`
296			`if (mb->mb_flags != MF_FREE)`
297			`goto major_problem_2;`
298			`ph->ph_free = mb->mb_next;`
299			`if (--ph->ph_nfree == 0) {`
300			`#ifdef DEBUG`
301			`printk ("nxp %p n %p f %p\n"KERN_DEBUG" ", ph, ph->ph_next, ph->ph_free);`
302			`#endif`
303			`*php = ph->ph_next;`
304			`ph->ph_next = sz->sd_used;`
305			`sz->sd_used = ph;`
306			`}`
307			`mb->mb_flags = MF_USED;`
308			`mb->mb_size = size;`
309			`bytes_wanted += size;`
310			`bytes_malloced += sz->sd_size;`
311			`restore_flags (flags);`
312			`#ifdef DEBUG`
313			`printk (" -> %p malloced\n", mb);`
314			`#endif`
315			`return mb + 1; /* increments past header */`
316			`} else {`
317			`printk ("\n" KERN_CRIT`
318			`"kmalloc: problem: page %p has null free pointer - "`
319			`"discarding page (pc=%p)\n", ph,`
320			`__builtin_return_address(0));`
321			`if (ph != ph->ph_next)`
322			`*php = ph->ph_next;`
323			`else`
324			`*php = NULL;`
325			`goto again;`
326			`}`
327			`no_free_page:`
328			`restore_flags (flags);`
329
330			`/* We need to get a new 4k page. Whether we get a new page or malloc 4k depends on`
331			`* the page size`
332			`*/`
333			`#ifdef PAGE_MALLOC`
334			`if (sz->sd_gfporder < 0) { /* malloc it */`
335			`#ifdef DEBUG`
336			`printk ("nsp:\n" KERN_DEBUG " ");`
337			`#endif`
338			`mb = kmalloc (PAGE_MALLOC - sizeof (struct mblk_header), priority \| dma_flag);`
339			`/*`
340			`* override malloc header with our own. This means that we`
341			`* destroy the size entry. However, we change the flags entry`
342			`* so that a free won't free it without the blocks inside it`
343			`* are freed, and the data put back as it was.`
344			`*/`
345			`if (mb)`
346			`ph = (struct page_header *) (mb - 1);`
347			`else`
348			`ph = NULL;`
349			`#ifdef DEBUG`
350			`printk (KERN_DEBUG);`
351			`#endif`
352			`} else`
353			`#endif`
354			`{`
355			`unsigned long max_addr;`
356
357			`max_addr = dma_flag ? MAX_DMA_ADDRESS : ~0UL;`
358			`#ifdef DEBUG`
359			`printk ("nlp:\n" KERN_DEBUG " ");`
360			`#endif`
361			`ph = (struct page_header *) __get_free_pages (priority, sz->sd_gfporder, max_addr);`
362			`if (ph)`
363			`pages_malloced += PAGE_SIZE;`
364			`}`
365
366			`if (!ph) {`
367			`static unsigned long last = 0;`
368			`if (priority != GFP_BUFFER && (last + 10*HZ) < jiffies) {`
369			`last = jiffies;`
370			`printk ("\n" KERN_CRIT "kmalloc: couldn't get a free page.....\n");`
371			`}`
372			`return NULL;`
373			`}`
374			`ph->ph_flags = MF_INUSE;`
375			`ph->ph_order = order;`
376			`ph->ph_nfree = sz->sd_blocks;`
377			`ph->ph_dma = dma_flag;`
378
379			`for (i = sz->sd_blocks, mb = (struct mblk_header *)(ph + 1); i > 1;`
380			`i --, mb = mb->mb_next) {`
381			`mb->mb_flags = MF_FREE;`
382			`mb->mb_next = (struct mblk_header *) (((unsigned long)mb) + sz->sd_size);`
383			`}`
384			`ph->ph_free = (struct mblk_header *)(ph + 1);`
385			`mb->mb_flags = MF_FREE;`
386			`mb->mb_next = NULL;`
387
388			`cli();`
389			`#ifdef DEBUG`
390			`printk ("New page %p, next %p\n" KERN_DEBUG " ", ph, *php);`
391			`#endif`
392			`ph->ph_next = *php;`
393			`*php = ph;`
394			`goto again;`
395
396			`major_problem_2:`
397			`#ifdef DEBUG`
398			`printk ("\n\nmb->flags = %08lX\n", mb->mb_flags);`
399			`#endif`
400			`panic ("kmalloc: problem: block %p on freelist %p isn't free (pc=%p)\n",`
401			`ph->ph_free, ph, __builtin_return_address(0));`
402			`major_problem:`
403			`panic ("kmalloc: problem: page %p in freelist isn't real (pc=%p)\n",`
404			`ph, __builtin_return_address(0));`
405			`}`
406
407			`void kfree (void *ptr)`
408			`{`
409			`int order, size;`
410			`unsigned long flags;`
411			`struct page_header *ph;`
412			`struct mblk_header *mb;`
413
414			`mb = ((struct mblk_header *)ptr) - 1;`
415
416			`if (mb->mb_flags != MF_USED) {`
417			`printk (KERN_ERR "kfree of non-kmalloc'd memory: %p\n", ptr);`
418			`return;`
419			`}`
420			`size = mb->mb_size;`
421			`order = get_order (size + sizeof(struct mblk_header));`
422
423			`if (order < 0) {`
424			`printk (KERN_ERR "kfree of non-kmalloc'd memory: %p,"`
425			`" size %d, order %d (pc=%p)\n", ptr, size, order, __builtin_return_address(0));`
426			`return;`
427			`}`
428
429			`#ifdef PAGE_MALLOC`
430			`if (sizes[order].sd_gfporder < 0)`
431			`ph = (struct page_header *) ((((unsigned long) mb) & ~(PAGE_MALLOC - 1)) +`
432			`sizeof (struct page_header));`
433			`else`
434			`#endif`
435			`ph = (struct page_header *) (((unsigned long) mb) & PAGE_MASK);`
436			`#ifdef DEBUG`
437			`printk (KERN_DEBUG "kfree: page starts at %p\n", ph);`
438			`#endif`
439
440			`if (ph->ph_flags != MF_INUSE && ph->ph_order != order) {`
441			`printk (KERN_ERR "kfree of non-kmalloc'd memory: %p,"`
442			`" size %d, order %d (pc=%p)\n", ptr, size, order, __builtin_return_address(0));`
443			`return;`
444			`}`
445
446			`mb->mb_flags = MF_FREE;`
447			`save_flags (flags);`
448			`cli ();`
449			`bytes_wanted -= size;`
450			`bytes_malloced -= sizes[order].sd_size;`
451			`mb->mb_next = ph->ph_free;`
452			`ph->ph_free = mb;`
453
454			`if (++ph->ph_nfree == 1) {`
455			`/*`
456			`* Page went from full to one free block: put it on the free list.`
457			`*/`
458			`struct page_header *pp;`
459
460			`if (sizes[order].sd_used == ph)`
461			`sizes[order].sd_used = ph->ph_next;`
462			`else {`
463			`for (pp = sizes[order].sd_used; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);`
464
465			`if (pp->ph_next == ph)`
466			`pp->ph_next = ph->ph_next;`
467			`else {`
468			`printk (KERN_ERR "kfree: page %p not found on used list (pc=%p)\n", ph,`
469			`__builtin_return_address(0));`
470			`restore_flags (flags);`
471			`return;`
472			`}`
473			`}`
474
475			`ph->ph_next = sizes[order].sd_firstfree;`
476			`sizes[order].sd_firstfree = ph;`
477			`}`
478
479			`if (ph->ph_nfree == sizes[order].sd_blocks) {`
480			`if (sizes[order].sd_firstfree == ph)`
481			`sizes[order].sd_firstfree = ph->ph_next;`
482			`else if (sizes[order].sd_dmafree == ph)`
483			`sizes[order].sd_dmafree = ph->ph_next;`
484			`else {`
485			`struct page_header *pp;`
486
487			`for (pp = sizes[order].sd_firstfree; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);`
488
489			`if (pp == NULL)`
490			`for (pp = sizes[order].sd_dmafree; pp != NULL && pp->ph_next != ph; pp = pp->ph_next);`
491
492			`if (pp)`
493			`pp->ph_next = ph->ph_next;`
494			`else`
495			`printk (KERN_ERR "Oops. Page %p not found on free list\n", ph);`
496			`}`
497			`restore_flags (flags);`
498
499			`#ifdef PAGE_MALLOC`
500			`if (sizes[order].sd_gfporder < 0) {`
501			`mb = (struct mblk_header *)ph;`
502			`mb->mb_flags = MF_USED;`
503			`mb->mb_size = PAGE_MALLOC - sizeof (struct mblk_header);`
504			`kfree (mb + 1);`
505			`} else`
506			`#endif`
507			`{`
508			`pages_malloced -= PAGE_SIZE;`
509			`free_pages ((unsigned long)ph, sizes[order].sd_gfporder);`
510			`}`
511			`}`
512			`}`
513
514
515			`void kmalloc_stats (void)`
516			`{`
517			`printk ("kmalloc usage: %ld bytes requested of malloc, %ld actually malloced, %ld bytes claimed\n", bytes_wanted,`
518			`bytes_malloced, pages_malloced);`
519			`}`
520