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Date: Mon, 30 Apr 2001 01:53:01 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: Jamie Lokier <lk@tantalophile.demon.co.uk>
Cc: "David S. Miller" <davem@redhat.com>,
        Jeff Garzik <jgarzik@mandrakesoft.com>,
        "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: X15 alpha release: as fast as TUX but in user space (fwd)
Message-ID: <20010430015301.D923@athlon.random>
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In-Reply-To: <20010429213804.D8512@pcep-jamie.cern.ch>; from lk@tantalophile.demon.co.uk on Sun, Apr 29, 2001 at 09:38:04PM +0200
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On Sun, Apr 29, 2001 at 09:38:04PM +0200, Jamie Lokier wrote:
> Fwiw, modern x86 has global TLB entries too.

my x86-64 implementation is marking the tlb entry global of course (so
it's not flushed during context switch):

#define __PAGE_KERNEL_VSYSCALL \
	(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)

static void __init map_vsyscall(void)
{
	extern char __vsyscall_0;
	unsigned long physaddr_page0 = (unsigned long) &__vsyscall_0 - __START_KERNEL_map;

	__set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL);
}

Andrea
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