renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 12:43:55 +08:00
Code
f3aafa6c25
linux-next/include/asm-frv
History
Martin Schwidefsky 2f569afd9c CONFIG_HIGHPTE vs. sub-page page tables. 
Background: I've implemented 1K/2K page tables for s390.  These sub-page
page tables are required to properly support the s390 virtualization
instruction with KVM.  The SIE instruction requires that the page tables
have 256 page table entries (pte) followed by 256 page status table entries
(pgste).  The pgstes are only required if the process is using the SIE
instruction.  The pgstes are updated by the hardware and by the hypervisor
for a number of reasons, one of them is dirty and reference bit tracking.
To avoid wasting memory the standard pte table allocation should return
1K/2K (31/64 bit) and 2K/4K if the process is using SIE.

Problem: Page size on s390 is 4K, page table size is 1K or 2K.  That means
the s390 version for pte_alloc_one cannot return a pointer to a struct
page.  Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one
cannot return a pointer to a pte either, since that would require more than
32 bit for the return value of pte_alloc_one (and the pte * would not be
accessible since its not kmapped).

Solution: The only solution I found to this dilemma is a new typedef: a
pgtable_t.  For s390 pgtable_t will be a (pte *) - to be introduced with a
later patch.  For everybody else it will be a (struct page *).  The
additional problem with the initialization of the ptl lock and the
NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and
a destructor pgtable_page_dtor.  The page table allocation and free
functions need to call these two whenever a page table page is allocated or
freed.  pmd_populate will get a pgtable_t instead of a struct page pointer.
 To get the pgtable_t back from a pmd entry that has been installed with
pmd_populate a new function pmd_pgtable is added.  It replaces the pmd_page
call in free_pte_range and apply_to_pte_range.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 09:22:42 -08:00
..
atomic.h move frv docs one level up 2008-02-03 15:54:28 +02:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
ax88796.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
bitops.h move frv docs one level up 2008-02-03 15:54:28 +02:00
bug.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
bugs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
busctl-regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
byteorder.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cacheflush.h include/asm-frv/: Spelling fixes 2008-02-03 17:34:55 +02:00
checksum.h [NET]: FRV checksum annotations. 2006-12-02 21:23:03 -08:00
cpu-irqs.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
cpumask.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cputime.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
current.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
delay.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
div64.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dm9000.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-mapping.h FRV: move DMA macros to scatterlist.h for consistency. 2008-02-05 09:44:20 -08:00
dma.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
elf.h Cleanup asm/{elf,page,user}.h: #ifdef __KERNEL__ is no longer needed 2008-02-07 08:42:30 -08:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fpu.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
futex.h [PATCH] lightweight robust futexes updates 2006-03-27 08:44:49 -08:00
gdb-stub.h [PATCH] FRV: Introduce asm-offsets for FRV arch 2006-07-10 13:24:22 -07:00
gpio-regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hardirq.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
highmem.h move frv docs one level up 2008-02-03 15:54:28 +02:00
hw_irq.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ide.h ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
init.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
io.h [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ipcbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irc-regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
irq.h frv: Remove bogus NO_IRQ = -1 define 2007-11-09 15:11:44 -08:00
Kbuild Unexport asm/page.h 2008-02-07 08:42:30 -08:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
kmap_types.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
linkage.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
local.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
math-emu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mb86943a.h FRV: Enable the MB86943 PCI arbiter correctly 2007-08-01 20:48:17 -07:00
mb93091-fpga-irqs.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
mb93093-fpga-irqs.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
mb93493-irqs.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
mb93493-regs.h [PATCH] FRV: Use the generic IRQ stuff 2006-09-26 08:48:53 -07:00
mb-regs.h [PATCH] frv: basic __iomem annotations 2006-06-23 07:42:54 -07:00
mc146818rtc.h [PATCH] frv: miscellaneous changes 2006-01-08 20:13:38 -08:00
mem-layout.h move frv docs one level up 2008-02-03 15:54:28 +02:00
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu_context.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mmu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
module.h [PATCH] frv: add module support stubs 2006-01-08 20:13:37 -08:00
msgbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h fix file specification in comments 2006-10-03 23:01:26 +02:00
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
param.h avoid overflows in kernel/time.c 2008-02-08 09:22:39 -08:00
pci.h PCI: remove pci_dac_dma_... APIs 2007-07-11 16:02:11 -07:00
percpu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable.h add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
posix_types.h asm-*/posix_types.h: scrub __GLIBC__ 2008-02-08 09:22:34 -08:00
processor.h [PATCH] Make cpu_relax() imply barrier() on all arches 2006-07-12 12:56:45 -07:00
ptrace.h [PATCH] fix frv headers_check 2007-02-01 16:17:05 -08:00
registers.h [PATCH] FRV: Introduce asm-offsets for FRV arch 2006-07-10 13:24:22 -07:00
resource.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
scatterlist.h FRV: move DMA macros to scatterlist.h for consistency. 2008-02-05 09:44:20 -08:00
sections.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
segment.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
serial-regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
serial.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
setup.h [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
shmbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
shmparam.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sigcontext.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
siginfo.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.h [PATCH] irq-flags: FRV: Use the new IRQF_ constants 2006-07-02 13:58:46 -07:00
smp.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
socket.h [NET]: Introducing socket mark socket option. 2008-01-31 19:27:19 -08:00
sockios.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
spinlock.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spr-regs.h [PATCH] FRV: Use virtual interrupt disablement 2006-02-14 16:09:35 -08:00
stat.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
statfs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
string.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
suspend.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
system.h Add cmpxchg_local to frv 2008-02-07 08:42:32 -08:00
termbits.h lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
thread_info.h include/asm-frv/thread_info.h: kmalloc + memset conversion to kzalloc 2007-10-16 09:43:03 -07:00
timer-regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
timex.h [PATCH] ntp: cleanup defines and comments 2006-10-01 00:39:27 -07:00
tlb.h FRV: Replace pgd management via slabs through quicklists 2007-05-09 12:30:46 -07:00
tlbflush.h remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
topology.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
types.h remove strict ansi check from __u64 in asm/types.h 2007-10-17 08:42:53 -07:00
uaccess.h frv: missing __clear_user() 2007-07-15 16:40:52 -07:00
ucontext.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unaligned.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
unistd.h timerfd: fix remaining architectures 2008-02-05 14:37:15 -08:00
user.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vga.h [PATCH] frv: miscellaneous changes 2006-01-08 20:13:38 -08:00
virtconvert.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
xor.h [PATCH] frv: miscellaneous changes 2006-01-08 20:13:38 -08:00