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Linux/arch/m68k/atari/stram.c

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  1 /*
  2  * Functions for ST-RAM allocations
  3  *
  4  * Copyright 1994-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
  5  *
  6  * This file is subject to the terms and conditions of the GNU General Public
  7  * License.  See the file COPYING in the main directory of this archive
  8  * for more details.
  9  */
 10 
 11 #include <linux/types.h>
 12 #include <linux/kernel.h>
 13 #include <linux/mm.h>
 14 #include <linux/kdev_t.h>
 15 #include <linux/major.h>
 16 #include <linux/init.h>
 17 #include <linux/slab.h>
 18 #include <linux/vmalloc.h>
 19 #include <linux/pagemap.h>
 20 #include <linux/bootmem.h>
 21 #include <linux/mount.h>
 22 #include <linux/blkdev.h>
 23 #include <linux/module.h>
 24 
 25 #include <asm/setup.h>
 26 #include <asm/machdep.h>
 27 #include <asm/page.h>
 28 #include <asm/pgtable.h>
 29 #include <asm/atarihw.h>
 30 #include <asm/atari_stram.h>
 31 #include <asm/io.h>
 32 
 33 
 34 /*
 35  * The ST-RAM allocator allocates memory from a pool of reserved ST-RAM of
 36  * configurable size, set aside on ST-RAM init.
 37  * As long as this pool is not exhausted, allocation of real ST-RAM can be
 38  * guaranteed.
 39  */
 40 
 41 /* set if kernel is in ST-RAM */
 42 static int kernel_in_stram;
 43 
 44 static struct resource stram_pool = {
 45         .name = "ST-RAM Pool"
 46 };
 47 
 48 static unsigned long pool_size = 1024*1024;
 49 
 50 
 51 static int __init atari_stram_setup(char *arg)
 52 {
 53         if (!MACH_IS_ATARI)
 54                 return 0;
 55 
 56         pool_size = memparse(arg, NULL);
 57         return 0;
 58 }
 59 
 60 early_param("stram_pool", atari_stram_setup);
 61 
 62 
 63 /*
 64  * This init function is called very early by atari/config.c
 65  * It initializes some internal variables needed for stram_alloc()
 66  */
 67 void __init atari_stram_init(void)
 68 {
 69         int i;
 70         void *stram_start;
 71 
 72         /*
 73          * determine whether kernel code resides in ST-RAM
 74          * (then ST-RAM is the first memory block at virtual 0x0)
 75          */
 76         stram_start = phys_to_virt(0);
 77         kernel_in_stram = (stram_start == 0);
 78 
 79         for (i = 0; i < m68k_num_memory; ++i) {
 80                 if (m68k_memory[i].addr == 0) {
 81                         return;
 82                 }
 83         }
 84 
 85         /* Should never come here! (There is always ST-Ram!) */
 86         panic("atari_stram_init: no ST-RAM found!");
 87 }
 88 
 89 
 90 /*
 91  * This function is called from setup_arch() to reserve the pages needed for
 92  * ST-RAM management.
 93  */
 94 void __init atari_stram_reserve_pages(void *start_mem)
 95 {
 96         /*
 97          * always reserve first page of ST-RAM, the first 2 KiB are
 98          * supervisor-only!
 99          */
100         if (!kernel_in_stram)
101                 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
102 
103         stram_pool.start = (resource_size_t)alloc_bootmem_low_pages(pool_size);
104         stram_pool.end = stram_pool.start + pool_size - 1;
105         request_resource(&iomem_resource, &stram_pool);
106 
107         pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n",
108                  pool_size, &stram_pool);
109 }
110 
111 
112 void *atari_stram_alloc(unsigned long size, const char *owner)
113 {
114         struct resource *res;
115         int error;
116 
117         pr_debug("atari_stram_alloc: allocate %lu bytes\n", size);
118 
119         /* round up */
120         size = PAGE_ALIGN(size);
121 
122         res = kzalloc(sizeof(struct resource), GFP_KERNEL);
123         if (!res)
124                 return NULL;
125 
126         res->name = owner;
127         error = allocate_resource(&stram_pool, res, size, 0, UINT_MAX,
128                                   PAGE_SIZE, NULL, NULL);
129         if (error < 0) {
130                 pr_err("atari_stram_alloc: allocate_resource() failed %d!\n",
131                        error);
132                 kfree(res);
133                 return NULL;
134         }
135 
136         pr_debug("atari_stram_alloc: returning %pR\n", res);
137         return (void *)res->start;
138 }
139 EXPORT_SYMBOL(atari_stram_alloc);
140 
141 
142 void atari_stram_free(void *addr)
143 {
144         unsigned long start = (unsigned long)addr;
145         struct resource *res;
146         unsigned long size;
147 
148         res = lookup_resource(&stram_pool, start);
149         if (!res) {
150                 pr_err("atari_stram_free: trying to free nonexistent region "
151                        "at %p\n", addr);
152                 return;
153         }
154 
155         size = resource_size(res);
156         pr_debug("atari_stram_free: free %lu bytes at %p\n", size, addr);
157         release_resource(res);
158         kfree(res);
159 }
160 EXPORT_SYMBOL(atari_stram_free);
161 

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