Re: [git pull] drm patches for 2.6.27-rc1

[Keith Packard <keithp@keithp.com>]

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On Sun, 2008-10-19 at 00:32 +0200, Ingo Molnar wrote:

> Mind sending patches for this? :-)

Here's what these functions would look like as wrappers on top of the
existing APIs:

/* x86_64 style */
static inline struct io_reserve *
iomap_reserve(unsigned long base, unsigned long size)
{
        return (struct io_reserve *) ioremap_wc(base, size);
}

static inline void *
iomap_atomic(struct io_reserve *reserve, unsigned long offset)
{
        return ((char *) reserve) + offset;
}

static inline void
iounmap_atomic(void *vaddr)
{
}

static inline void
iomap_unreserve(struct io_reserve *reserve)
{
        iounmap(reserve);
}

/* HIGHMEM style */
#if 0
static inline struct io_reserve *
iomap_reserve(unsigned long base, unsigned long size)
{
        return (struct io_reserve *) base;
}

static inline void *
iomap_atomic(struct io_reserve *reserve, unsigned long offset)
{
        offset += (unsigned long) reserve;
        return kmap_atomic(offset >> PAGE_SHIFT, KM_USER0);
}

static inline void
iounmap_atomic(void *vaddr)
{
        kunmap_atomic(vaddr, KM_USER0);
}

static inline void
iomap_unreserve(struct io_reserve *reserve)
{
}
#endif

/* 32-bit non-HIGHMEM style */
#if 0
static inline struct io_reserve *
iomap_reserve(unsigned long base, unsigned long size)
{
        return NULL;
}

static inline void *
iomap_atomic(struct io_reserve *reserve, unsigned long offset)
{
        return NULL;
}

static inline void
iounmap_atomic(void *vaddr)
{
}

static inline void
iomap_unreserve(struct io_reserve *reserve)
{
}
#endif

> 
> 	Ingo
-- 
keith.packard@intel.com

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