mirror of https://gitee.com/openkylin/linux.git
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
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* Simple allocator for internal RAM in ETRAX FS
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*
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* Copyright (c) 2004 Axis Communications AB.
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <asm/arch/memmap.h>
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#define STATUS_FREE 0
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#define STATUS_ALLOCATED 1
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struct intmem_allocation {
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struct list_head entry;
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unsigned int size;
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unsigned offset;
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char status;
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};
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static struct list_head intmem_allocations;
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static void* intmem_virtual;
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static void crisv32_intmem_init(void)
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{
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static int initiated = 0;
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if (!initiated) {
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struct intmem_allocation* alloc =
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(struct intmem_allocation*)kmalloc(sizeof *alloc, GFP_KERNEL);
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INIT_LIST_HEAD(&intmem_allocations);
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intmem_virtual = ioremap(MEM_INTMEM_START, MEM_INTMEM_SIZE);
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initiated = 1;
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alloc->size = MEM_INTMEM_SIZE;
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alloc->offset = 0;
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alloc->status = STATUS_FREE;
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list_add_tail(&alloc->entry, &intmem_allocations);
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}
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}
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void* crisv32_intmem_alloc(unsigned size, unsigned align)
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{
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struct intmem_allocation* allocation;
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struct intmem_allocation* tmp;
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void* ret = NULL;
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preempt_disable();
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crisv32_intmem_init();
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list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
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int alignment = allocation->offset % align;
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alignment = alignment ? align - alignment : alignment;
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if (allocation->status == STATUS_FREE &&
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allocation->size >= size + alignment) {
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if (allocation->size > size + alignment) {
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struct intmem_allocation* alloc =
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(struct intmem_allocation*)
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kmalloc(sizeof *alloc, GFP_ATOMIC);
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alloc->status = STATUS_FREE;
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alloc->size = allocation->size - size - alignment;
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alloc->offset = allocation->offset + size;
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list_add(&alloc->entry, &allocation->entry);
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if (alignment) {
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struct intmem_allocation* tmp;
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tmp = (struct intmem_allocation*)
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kmalloc(sizeof *tmp, GFP_ATOMIC);
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tmp->offset = allocation->offset;
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tmp->size = alignment;
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tmp->status = STATUS_FREE;
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allocation->offset += alignment;
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list_add_tail(&tmp->entry, &allocation->entry);
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}
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}
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allocation->status = STATUS_ALLOCATED;
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allocation->size = size;
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ret = (void*)((int)intmem_virtual + allocation->offset);
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}
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}
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preempt_enable();
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return ret;
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}
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void crisv32_intmem_free(void* addr)
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{
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struct intmem_allocation* allocation;
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struct intmem_allocation* tmp;
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if (addr == NULL)
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return;
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preempt_disable();
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crisv32_intmem_init();
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list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
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if (allocation->offset == (int)(addr - intmem_virtual)) {
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struct intmem_allocation* prev =
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list_entry(allocation->entry.prev,
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struct intmem_allocation, entry);
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struct intmem_allocation* next =
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list_entry(allocation->entry.next,
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struct intmem_allocation, entry);
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allocation->status = STATUS_FREE;
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/* Join with prev and/or next if also free */
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if (prev->status == STATUS_FREE) {
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prev->size += allocation->size;
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list_del(&allocation->entry);
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kfree(allocation);
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allocation = prev;
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}
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if (next->status == STATUS_FREE) {
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allocation->size += next->size;
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list_del(&next->entry);
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kfree(next);
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}
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preempt_enable();
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return;
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}
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}
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preempt_enable();
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}
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void* crisv32_intmem_phys_to_virt(unsigned long addr)
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{
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return (void*)(addr - MEM_INTMEM_START+
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(unsigned long)intmem_virtual);
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}
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unsigned long crisv32_intmem_virt_to_phys(void* addr)
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{
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return (unsigned long)((unsigned long )addr -
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(unsigned long)intmem_virtual + MEM_INTMEM_START);
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}
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