#ifndef DIRTY_H
#define DIRTY_H

#include "compiler.h"
#include "ioregs.h"

#define DIRTY_PAGE_BITS		12
#define DIRTY_PAGE_SIZE		(1U << DIRTY_PAGE_BITS)
#define DIRTY_PAGES		(1U << (SDRAM_BITS - DIRTY_PAGE_BITS))
#define DIRTY_PAGE_MASK		(DIRTY_PAGES - 1)

static inline size_t dirty_page_num(const void *addr)
{
    return ((size_t)addr - SDRAM_ADDR) >> DIRTY_PAGE_BITS;
}

static inline volatile bool *dirty_page_reg(size_t page)
{
    return (volatile bool *)(&DIRTY_PAGE_REG + page);
}

static inline bool is_dirty_page(size_t page)
{
    volatile bool *dreg = dirty_page_reg(page);
    return *dreg;
}

static inline bool mem_dirty(const void *addr)
{
    return is_dirty_page(dirty_page_num(addr));
}

static inline bool is_dirty_page_clear(size_t page)
{
    volatile bool *dreg = dirty_page_reg(page);
    bool d = *dreg;
    *dreg = d;
    return d;
}

static inline bool mem_dirty_clear(const void *addr)
{
    return is_dirty_page_clear(dirty_page_num(addr));
}

#endif /* DIRTY_H */