Commit | Line | Data |
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1da177e4 | 1 | /* |
217bbd81 | 2 | * Functions for ST-RAM allocations |
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/pagemap.h> | |
1da177e4 LT |
20 | #include <linux/bootmem.h> |
21 | #include <linux/mount.h> | |
22 | #include <linux/blkdev.h> | |
a3b2004a | 23 | #include <linux/module.h> |
1da177e4 LT |
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> | |
1da177e4 | 32 | |
1da177e4 | 33 | |
f9c98d02 | 34 | /* |
217bbd81 MS |
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. | |
1da177e4 LT |
39 | */ |
40 | ||
1da177e4 LT |
41 | /* set if kernel is in ST-RAM */ |
42 | static int kernel_in_stram; | |
43 | ||
217bbd81 MS |
44 | static struct resource stram_pool = { |
45 | .name = "ST-RAM Pool" | |
46 | }; | |
1da177e4 | 47 | |
217bbd81 | 48 | static unsigned long pool_size = 1024*1024; |
1da177e4 | 49 | |
1da177e4 | 50 | |
217bbd81 MS |
51 | static int __init atari_stram_setup(char *arg) |
52 | { | |
53 | if (!MACH_IS_ATARI) | |
54 | return 0; | |
1da177e4 | 55 | |
217bbd81 MS |
56 | pool_size = memparse(arg, NULL); |
57 | return 0; | |
58 | } | |
1da177e4 | 59 | |
217bbd81 | 60 | early_param("stram_pool", atari_stram_setup); |
1da177e4 | 61 | |
1da177e4 LT |
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; | |
217bbd81 | 70 | void *stram_start; |
1da177e4 | 71 | |
217bbd81 MS |
72 | /* |
73 | * determine whether kernel code resides in ST-RAM | |
74 | * (then ST-RAM is the first memory block at virtual 0x0) | |
75 | */ | |
1da177e4 LT |
76 | stram_start = phys_to_virt(0); |
77 | kernel_in_stram = (stram_start == 0); | |
78 | ||
217bbd81 | 79 | for (i = 0; i < m68k_num_memory; ++i) { |
1da177e4 | 80 | if (m68k_memory[i].addr == 0) { |
1da177e4 LT |
81 | return; |
82 | } | |
83 | } | |
217bbd81 | 84 | |
1da177e4 | 85 | /* Should never come here! (There is always ST-Ram!) */ |
217bbd81 | 86 | panic("atari_stram_init: no ST-RAM found!"); |
1da177e4 LT |
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 | { | |
217bbd81 MS |
96 | /* |
97 | * always reserve first page of ST-RAM, the first 2 KiB are | |
98 | * supervisor-only! | |
99 | */ | |
1da177e4 | 100 | if (!kernel_in_stram) |
72a7fe39 | 101 | reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT); |
1da177e4 | 102 | |
217bbd81 MS |
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); | |
1da177e4 | 106 | |
217bbd81 MS |
107 | pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n", |
108 | pool_size, &stram_pool); | |
1da177e4 LT |
109 | } |
110 | ||
111 | ||
217bbd81 | 112 | void *atari_stram_alloc(unsigned long size, const char *owner) |
1da177e4 | 113 | { |
217bbd81 MS |
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; | |
1da177e4 LT |
134 | } |
135 | ||
217bbd81 MS |
136 | pr_debug("atari_stram_alloc: returning %pR\n", res); |
137 | return (void *)res->start; | |
1da177e4 | 138 | } |
a3b2004a | 139 | EXPORT_SYMBOL(atari_stram_alloc); |
1da177e4 | 140 | |
1da177e4 | 141 | |
217bbd81 | 142 | void atari_stram_free(void *addr) |
1da177e4 | 143 | { |
217bbd81 MS |
144 | unsigned long start = (unsigned long)addr; |
145 | struct resource *res; | |
146 | unsigned long size; | |
1da177e4 | 147 | |
217bbd81 MS |
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); | |
1da177e4 LT |
152 | return; |
153 | } | |
f9c98d02 | 154 | |
217bbd81 MS |
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); | |
1da177e4 | 159 | } |
a3b2004a | 160 | EXPORT_SYMBOL(atari_stram_free); |