Skip to main content

Browse the archive

Revision 9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b authored by Len Brown on 06 February 2009, 19:00:56 UTC, committed by Len Brown on 06 February 2009, 19:00:56 UTC 
ACPI: disable ACPI cleanly when bad RSDP found
 
When ACPI is disabled in the BIOS of this VIA C3 box,
it invalidates the RSDP, which Linux notices:

ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926]

Bug Linux neglected to disable ACPI at that stage,
and later scribbled on smp_found_config:

ACPI: No APIC-table, disabling MPS

But this box doesn't run well in legacy PIC mode,
it needed IOAPIC mode to perform correctly:

http://lkml.org/lkml/2009/2/5/39

So exit ACPI mode cleanly when we first detect
that it is hopeless.

Signed-off-by: Len Brown <len.brown@intel.com>
1 parent f3b39f1
Raw File
shm.h 
#ifndef _M68K_SHM_H
#define _M68K_SHM_H


/* format of page table entries that correspond to shared memory pages
   currently out in swap space (see also mm/swap.c):
   bits 0-1 (PAGE_PRESENT) is  = 0
   bits 8..2 (SWP_TYPE) are = SHM_SWP_TYPE
   bits 31..9 are used like this:
   bits 15..9 (SHM_ID) the id of the shared memory segment
   bits 30..16 (SHM_IDX) the index of the page within the shared memory segment
                    (actually only bits 25..16 get used since SHMMAX is so low)
   bit 31 (SHM_READ_ONLY) flag whether the page belongs to a read-only attach
*/
/* on the m68k both bits 0 and 1 must be zero */
/* format on the sun3 is similar, but bits 30, 31 are set to zero and all
   others are reduced by 2. --m */

#ifndef CONFIG_SUN3
#define SHM_ID_SHIFT	9
#else
#define SHM_ID_SHIFT	7
#endif
#define _SHM_ID_BITS	7
#define SHM_ID_MASK	((1<<_SHM_ID_BITS)-1)

#define SHM_IDX_SHIFT	(SHM_ID_SHIFT+_SHM_ID_BITS)
#define _SHM_IDX_BITS	15
#define SHM_IDX_MASK	((1<<_SHM_IDX_BITS)-1)

#endif /* _M68K_SHM_H */
back to top