lib/buffer.c

#include <buffer.h>
#include <mempool.h>
#include <dmapool.h>
#include <physmem.h>

#ifdef CONFIG_NR_BUFFERS
struct mem_pool buffer_pool;

struct buffer *buffer_alloc(void)
{
        struct buffer   *buf;

        buf = mem_pool_alloc(&buffer_pool);
        dbg_printf("buffer_alloc: %p\n", buf);
        buf->dma_desc = NULL;

        return buf;
}

void buffer_free(struct buffer *buf)
{
        dbg_printf("buffer_free: %p\n", buf);

        mem_pool_free(&buffer_pool, buf);
}

void buffer_resize(struct buffer *buf, size_t new_size)
{
        assert(buf);

        buf->len = new_size;
}

#ifdef CONFIG_DMAPOOL_GENERIC_POOLS

struct buffer *buffer_dma_alloc(size_t size)
{
        struct buffer   *buf;
        void            *dma_data;
        phys_addr_t     dma_phys;

        buf = buffer_alloc();
        if (buf == NULL)
                return NULL;

        dma_data = dma_alloc(&dma_phys, size);
        if (dma_data == NULL) {
                buffer_free(buf);
                return NULL;
        }

        buf->addr.ptr = dma_data;
        buf->addr.phys = dma_phys;
        buf->len = size;

        return buf;
}

void buffer_dma_free(struct buffer *buf, size_t size)
{
        dma_free(buf->addr.ptr, size);
        buffer_free(buf);
}
#endif /* CONFIG_DMAPOOL_GENERIC_POOLS */

void buffer_pool_init(void)
{
        mem_pool_init_physmem(&buffer_pool, &cpu_sram_pool,
                        CONFIG_NR_BUFFERS, sizeof(struct buffer), 2);
}
#endif

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