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Yuri Tikhonov e12401222f powerpc/44x: Support for 256KB PAGE_SIZE 
This patch adds support for 256KB pages on ppc44x-based boards.

For simplification of implementation with 256KB pages we still assume
2-level paging. As a side effect this leads to wasting extra memory space
reserved for PTE tables: only 1/4 of pages allocated for PTEs are
actually used. But this may be an acceptable trade-off to achieve the
high performance we have with big PAGE_SIZEs in some applications (e.g.
RAID).

Also with 256KB PAGE_SIZE we increase THREAD_SIZE up to 32KB to minimize
the risk of stack overflows in the cases of on-stack arrays, which size
depends on the page size (e.g. multipage BIOs, NTFS, etc.).

With 256KB PAGE_SIZE we need to decrease the PKMAP_ORDER at least down
to 9, otherwise all high memory (2 ^ 10 * PAGE_SIZE == 256MB) we'll be
occupied by PKMAP addresses leaving no place for vmalloc. We do not
separate PKMAP_ORDER for 256K from 16K/64K PAGE_SIZE here; actually that
value of 10 in support for 16K/64K had been selected rather intuitively.
Thus now for all cases of PAGE_SIZE on ppc44x (including the default, 4KB,
one) we have 512 pages for PKMAP.

Because ELF standard supports only page sizes up to 64K, then you should
use binutils later than 2.17.50.0.3 with '-zmax-page-size' set to 256K
for building applications, which are to be run with the 256KB-page sized
kernel. If using the older binutils, then you should patch them like follows:

	--- binutils/bfd/elf32-ppc.c.orig
	+++ binutils/bfd/elf32-ppc.c

	-#define ELF_MAXPAGESIZE                0x10000
	+#define ELF_MAXPAGESIZE                0x40000

One more restriction we currently have with 256KB page sizes is inability
to use shmem safely, so, for now, the 256KB is available only if you turn
the CONFIG_SHMEM option off (another variant is to use BROKEN).
Though, if you need shmem with 256KB pages, you can always remove the !SHMEM
dependency in 'config PPC_256K_PAGES', and use the workaround available here:
 http://lkml.org/lkml/2008/12/19/20

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2009-02-14 14:40:04 -05:00
..
vdso32 powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
vdso64 powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
.gitignore powerpc: Ignore generated vmlinux.lds in git 2008-10-07 14:26:18 +11:00
align.c powerpc: Fix uninitialised variable in VSX alignment code 2008-09-03 20:53:14 +10:00
asm-offsets.c Merge commit 'kumar/kumar-next' into next 2009-01-13 13:59:03 +11:00
audit.c
btext.c powerpc: Use the common ascii hex helpers 2008-08-20 16:34:57 +10:00
cacheinfo.c powerpc/cacheinfo: Rename cache_dir per-cpu variable 2009-01-13 14:48:02 +11:00
cacheinfo.h powerpc: Rewrite sysfs processor cache info code 2009-01-08 16:25:10 +11:00
clock.c
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S powerpc/virtex5: Fix Virtex5 machine check handling 2008-12-05 14:34:26 -05:00
cpu_setup_fsl_booke.S powerpc/fsl-booke: Cleanup init/exception setup to be runtime 2009-01-28 18:16:50 -06:00
cpu_setup_pa6t.S
cpu_setup_ppc970.S powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit 2008-09-15 11:08:35 -07:00
cputable.c powerpc/fsl-booke: Cleanup init/exception setup to be runtime 2009-01-28 18:16:50 -06:00
crash.c powerpc: Increase CRASH_HANDLER_MAX 2008-06-30 22:31:00 +10:00
crash_dump.c powerpc: Support for relocatable kdump kernel 2008-10-22 15:01:22 +11:00
dma-iommu.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
dma.c powerpc: Add sync_*_for_* to dma_ops 2008-12-03 20:46:36 +11:00
entry_32.S powerpc: ftrace, do nothing in mcount call for dyn ftrace 2008-11-28 14:07:45 +01:00
entry_64.S Merge commit 'v2.6.28-rc7' into tracing/core 2008-12-04 09:07:19 +01:00
firmware.c
fpu.S powerpc: Add VSX context save/restore, ptrace and signal support 2008-07-01 11:28:50 +10:00
ftrace.c powerpc/ftrace: Fix math to calculate offset in TOC 2009-02-10 14:39:08 +11:00
head_8xx.S
head_32.S powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M 2008-12-23 15:13:29 +11:00
head_40x.S [POWERPC] 40x/Book-E: Save/restore volatile exception registers 2008-06-02 14:56:35 -05:00
head_44x.S powerpc/44x: Support 16K/64K base page sizes on 44x 2008-12-29 09:53:25 +11:00
head_64.S powerpc/powermac: Fix occasional SMP boot failure 2009-01-13 14:48:03 +11:00
head_booke.h powerpc/44x: Support for 256KB PAGE_SIZE 2009-02-14 14:40:04 -05:00
head_fsl_booke.S powerpc/fsl-booke: Cleanup init/exception setup to be runtime 2009-01-28 18:16:50 -06:00
ibmebus.c powerpc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:38 +11:00
idle.c powerpc: ftrace, do not latency trace idle 2008-11-20 10:51:15 -08:00
idle_6xx.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_e500.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_power4.S
init_task.c take init_fs to saner place 2008-12-31 18:07:42 -05:00
io.c ftrace: support for PowerPC 2008-05-23 22:43:11 +02:00
iomap.c
iommu.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
irq.c cpumask: make irq_set_affinity() take a const struct cpumask 2008-12-13 21:20:26 +10:30
isa-bridge.c [POWERPC] Remove leftover printk in isa-bridge.c 2008-05-09 20:22:59 +10:00
kgdb.c kgdb, x86, arm, mips, powerpc: ignore user space single stepping 2008-09-26 10:36:41 -05:00
kprobes.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-01-07 11:31:52 -08:00
l2cr_6xx.S
legacy_serial.c powerpc/powermac: Fixup default serial port device for pmac_zilog 2008-07-28 16:30:53 +10:00
lparcfg.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
machine_kexec.c powerpc/kexec: Check crash_base for relocatable kernel 2009-01-13 14:47:59 +11:00
machine_kexec_32.c kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
machine_kexec_64.c powerpc/32: Setup OF properties for kdump 2008-12-23 15:13:29 +11:00
Makefile powerpc/fsl-booke: Cleanup init/exception setup to be runtime 2009-01-28 18:16:50 -06:00
misc.S powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit 2008-09-15 11:08:35 -07:00
misc_32.S powerpc/44x: Support 16K/64K base page sizes on 44x 2008-12-29 09:53:25 +11:00
misc_64.S powerpc: Kexec exit should not use magic numbers 2008-10-31 16:11:44 +11:00
module.c powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
module_32.c powerpc/ppc32: ftrace, dynamic ftrace to handle modules 2008-11-20 10:52:53 -08:00
module_64.c powerpc/ppc64: ftrace, handle module trampolines for dyn ftrace 2008-11-20 10:52:28 -08:00
msi.c [POWERPC] Fix sparse warnings in arch/powerpc/kernel 2008-05-14 22:31:59 +10:00
nvram_64.c
of_device.c powerpc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:38 +11:00
of_platform.c powerpc: Add missing reference to coherent_dma_mask 2008-07-08 21:06:35 -07:00
paca.c powerpc: Update page-in counter for CMM 2008-11-05 22:08:28 +11:00
pci-common.c powerpc/pci: mmap anonymous memory when legacy_mem doesn't exist 2009-02-10 14:39:08 +11:00
pci_32.c powerpc: Remove `have_of' global variable 2008-12-16 15:52:57 +11:00
pci_64.c powerpc: Cleanup from l64 to ll64 change: arch code 2009-01-13 14:47:59 +11:00
pci_dn.c
pmc.c
ppc32.h powerpc: Add VSX context save/restore, ptrace and signal support 2008-07-01 11:28:50 +10:00
ppc_ksyms.c powerpc: Export cacheable_memzero as its now used in a driver 2009-01-08 16:25:17 +11:00
ppc_save_regs.S powerpc: Prepare xmon_save_regs for use with kdump 2008-12-23 15:13:28 +11:00
proc_ppc64.c
process.c [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
prom.c powerpc: Allow debugging of LMBs with lmb=debug 2009-02-11 13:38:00 +11:00
prom_init.c powerpc: Use correct type in prom_init.c 2009-01-08 16:25:16 +11:00
prom_init_check.sh powerpc: Fix build issue with CONFIG_RELOCATABLE=y 2008-10-21 15:17:49 +11:00
prom_parse.c PCI: powerpc: use generic pci_swizzle_interrupt_pin() 2009-01-07 11:12:52 -08:00
ptrace.c powerpc: Don't use the wrong thread_struct for ptrace get/set VSX regs 2008-07-30 15:26:54 +10:00
ptrace32.c powerpc: Correctly hookup PTRACE_GET/SETVSRREGS for 32 bit processes 2008-07-30 15:26:54 +10:00
reloc_64.S powerpc: Make the 64-bit kernel as a position-independent executable 2008-09-15 11:08:38 -07:00
rtas-proc.c [POWERPC] Fix sparse warnings in arch/powerpc/kernel 2008-05-14 22:31:59 +10:00
rtas-rtc.c
rtas.c powerpc/pseries: Check for GIQ indicator before calling set-indicator 2008-12-16 15:53:13 +11:00
rtas_flash.c SL*B: drop kmem cache argument from constructor 2008-07-26 12:00:07 -07:00
rtas_pci.c powerpc/pci: Fix various pseries PCI hotplug issues 2008-11-06 09:31:52 +11:00
setup-common.c powerpc: Move memory size print into common show_cpuinfo for 32-bit 2008-10-22 11:00:25 +11:00
setup.h
setup_32.c powerpc/32: Wire up the trampoline code for kdump 2008-12-23 15:13:29 +11:00
setup_64.c powerpc: Remove unused ppc64_terminate_msg() 2009-02-11 13:38:00 +11:00
signal.c powerpc: Add TIF_NOTIFY_RESUME support for tracehook 2008-07-28 16:30:50 +10:00
signal.h x86, um: get rid of uml signal.h 2008-10-22 22:55:20 -07:00
signal_32.c powerpc: Fix msr check in compat_sys_swapcontext 2008-11-11 19:42:22 +11:00
signal_64.c powerpc: Fix swapcontext system for VSX + old ucontext size 2008-10-31 16:12:00 +11:00
smp-tbsync.c powerpc: Silence software timebase sync 2008-11-05 22:08:28 +11:00
smp.c Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
softemu8xx.c Remove asm/a.out.h files for all architectures without a.out support. 2008-09-06 19:30:24 +01:00
stacktrace.c powerpc: Removed duplicated include in stacktrace.c 2008-07-28 16:30:47 +10:00
suspend.c PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
swsusp.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
swsusp_32.S powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
swsusp_64.c
swsusp_asm64.S powerpc: Fix 64-bit hibernation with 64k pages 2008-10-07 14:26:20 +11:00
sys_ppc32.c compat: generic compat get/settimeofday 2008-10-16 11:21:33 -07:00
syscalls.c powerpc/mm: Add Strong Access Ordering support 2008-07-09 16:30:45 +10:00
sysfs.c powerpc: Rewrite sysfs processor cache info code 2009-01-08 16:25:10 +11:00
systbl.S
systbl_chk.c
systbl_chk.sh
tau_6xx.c on_each_cpu(): kill unused 'retry' parameter 2008-06-26 11:24:38 +02:00
time.c Merge branch 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2009-01-03 11:56:24 -08:00
traps.c powerpc: Add SPE/EFP math emulation for E500v1/v2 processors. 2008-12-03 08:19:16 -06:00
udbg.c
udbg_16550.c powerpc: Unsigned speed cannot be negative in udbg_16559.c 2008-10-21 15:17:47 +11:00
vdso.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
vecemu.c
vector.S
vio.c powerpc/pseries: Correct VIO bus accounting problem in CMO env. 2009-01-28 17:15:52 +11:00
vmlinux.lds.S powerpc: Make dummy section a valid note header 2009-01-13 14:47:58 +11:00