2 * Simple allocator for internal RAM in ETRAX FS
4 * Copyright (c) 2004 Axis Communications AB.
7 #include <linux/list.h>
8 #include <linux/slab.h>
13 #define STATUS_ALLOCATED 1
15 #ifdef CONFIG_ETRAX_L2CACHE
16 #define RESERVED_SIZE 66*1024
18 #define RESERVED_SIZE 0
21 struct intmem_allocation {
22 struct list_head entry;
29 static struct list_head intmem_allocations;
30 static void* intmem_virtual;
32 static void crisv32_intmem_init(void)
34 static int initiated = 0;
36 struct intmem_allocation* alloc;
37 alloc = kmalloc(sizeof *alloc, GFP_KERNEL);
38 INIT_LIST_HEAD(&intmem_allocations);
39 intmem_virtual = ioremap(MEM_INTMEM_START + RESERVED_SIZE,
40 MEM_INTMEM_SIZE - RESERVED_SIZE);
42 alloc->size = MEM_INTMEM_SIZE - RESERVED_SIZE;
44 alloc->status = STATUS_FREE;
45 list_add_tail(&alloc->entry, &intmem_allocations);
49 void* crisv32_intmem_alloc(unsigned size, unsigned align)
51 struct intmem_allocation* allocation;
52 struct intmem_allocation* tmp;
56 crisv32_intmem_init();
58 list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
59 int alignment = allocation->offset % align;
60 alignment = alignment ? align - alignment : alignment;
62 if (allocation->status == STATUS_FREE &&
63 allocation->size >= size + alignment) {
64 if (allocation->size > size + alignment) {
65 struct intmem_allocation* alloc;
66 alloc = kmalloc(sizeof *alloc, GFP_ATOMIC);
67 alloc->status = STATUS_FREE;
68 alloc->size = allocation->size - size -
70 alloc->offset = allocation->offset + size +
72 list_add(&alloc->entry, &allocation->entry);
75 struct intmem_allocation *tmp;
76 tmp = kmalloc(sizeof *tmp, GFP_ATOMIC);
77 tmp->offset = allocation->offset;
78 tmp->size = alignment;
79 tmp->status = STATUS_FREE;
80 allocation->offset += alignment;
81 list_add_tail(&tmp->entry,
85 allocation->status = STATUS_ALLOCATED;
86 allocation->size = size;
87 ret = (void*)((int)intmem_virtual + allocation->offset);
94 void crisv32_intmem_free(void* addr)
96 struct intmem_allocation* allocation;
97 struct intmem_allocation* tmp;
103 crisv32_intmem_init();
105 list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
106 if (allocation->offset == (int)(addr - intmem_virtual)) {
107 struct intmem_allocation *prev =
108 list_entry(allocation->entry.prev,
109 struct intmem_allocation, entry);
110 struct intmem_allocation *next =
111 list_entry(allocation->entry.next,
112 struct intmem_allocation, entry);
114 allocation->status = STATUS_FREE;
115 /* Join with prev and/or next if also free */
116 if ((&prev->entry != &intmem_allocations) &&
117 (prev->status == STATUS_FREE)) {
118 prev->size += allocation->size;
119 list_del(&allocation->entry);
123 if ((&next->entry != &intmem_allocations) &&
124 (next->status == STATUS_FREE)) {
125 allocation->size += next->size;
126 list_del(&next->entry);
136 void* crisv32_intmem_phys_to_virt(unsigned long addr)
138 return (void *)(addr - (MEM_INTMEM_START + RESERVED_SIZE) +
139 (unsigned long)intmem_virtual);
142 unsigned long crisv32_intmem_virt_to_phys(void* addr)
144 return (unsigned long)((unsigned long )addr -
145 (unsigned long)intmem_virtual + MEM_INTMEM_START +
149 static int __init crisv32_intmem_setup(void)
151 crisv32_intmem_init();
155 device_initcall(crisv32_intmem_setup);