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

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Message-Id: <1224389697.4384.118.camel@koto.keithp.com>
Date:	Sat, 18 Oct 2008 21:14:57 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	keithp@...thp.com, Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sf.net, Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [git pull] drm patches for 2.6.27-rc1

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@...el.com

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