lkml.org 
[lkml]   [2001]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: X15 alpha release: as fast as TUX but in user space (fwd)
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:52    [W:0.170 / U:0.220 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site