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dc21af99fa
linux/arch/arm/include/asm
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Russell King dc21af99fa ARM: P2V: introduce phys_to_virt/virt_to_phys runtime patching 
This idea came from Nicolas, Eric Miao produced an initial version,
which was then rewritten into this.

Patch the physical to virtual translations at runtime.  As we modify
the code, this makes it incompatible with XIP kernels, but allows us
to achieve this with minimal loss of performance.

As many translations are of the form:

	physical = virtual + (PHYS_OFFSET - PAGE_OFFSET)
	virtual = physical - (PHYS_OFFSET - PAGE_OFFSET)

we generate an 'add' instruction for __virt_to_phys(), and a 'sub'
instruction for __phys_to_virt().  We calculate at run time (PHYS_OFFSET
- PAGE_OFFSET) by comparing the address prior to MMU initialization with
where it should be once the MMU has been initialized, and place this
constant into the above add/sub instructions.

Once we have (PHYS_OFFSET - PAGE_OFFSET), we can calculate the real
PHYS_OFFSET as PAGE_OFFSET is a build-time constant, and save this for
the C-mode PHYS_OFFSET variable definition to use.

At present, we are unable to support Realview with Sparsemem enabled
as this uses a complex mapping function, and MSM as this requires a
constant which will not fit in our math instruction.

Add a module version magic string for this feature to prevent
incompatible modules being loaded.

Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-17 23:27:32 +00:00
..
hardware ARM: 6635/2: Configure reference clock for Versatile Express timers 2011-01-25 16:18:33 +00:00
mach Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00
a.out-core.h
a.out.h headers_check fix: arm, a.out.h 2009-02-01 11:01:22 +05:30
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
assembler.h Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00
atomic.h ARM: 6212/1: atomic ops: add memory constraints to inline asm 2010-07-09 11:29:35 +01:00
auxvec.h
bitops.h ARM: 6621/1: bitops: remove condition code clobber for CLZ 2011-01-12 14:22:25 +00:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h
bugs.h
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h ARM: implement support for read-mostly sections 2010-12-05 08:39:36 +00:00
cacheflush.h Merge branches 'at91', 'dcache', 'ftrace', 'hwbpt', 'misc', 'mmci', 's3c', 'st-ux' and 'unwind' into devel 2010-10-18 22:34:25 +01:00
cachetype.h ARM: 6385/1: setup: detect aliasing I-cache when D-cache is non-aliasing 2010-10-04 20:57:09 +01:00
checksum.h
clkdev.h ARM: 6483/1: arm & sh: factorised duplicated clkdev.c 2010-11-26 10:51:04 +00:00
cpu-multi32.h
cpu-single.h
cpu.h ARM: 5872/1: ARM: include needed linux/cpu.h in asm/cpu.h 2010-01-10 13:03:52 +00:00
cputime.h
cputype.h Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel 2009-09-21 16:02:30 +01:00
current.h
delay.h
device.h Driver Core: Add platform device arch data V3 2009-07-22 00:28:38 +02:00
div64.h
dma-mapping.h ARM: DMA: add support for DMA debugging 2011-01-06 22:31:11 +00:00
dma.h ARM: 5870/1: arch/arm: Fix build failure for defconfigs without CONFIG_ISA_DMA_API set 2010-01-10 00:08:03 +00:00
domain.h ARM: 6384/1: Remove the domain switching on ARMv6k/v7 CPUs 2010-11-04 15:44:31 +00:00
ecard.h
elf.h ARM: 6486/1: provide zero vmcore_elf64_check_arch() 2010-11-30 13:40:01 +00:00
emergency-restart.h
entry-macro-multi.S Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00
entry-macro-vic2.S ARM: Add common entry code for system with two VICs 2010-01-15 17:10:14 +09:00
errno.h
fb.h
fcntl.h
fiq.h
fixmap.h [ARM] fixmap support 2009-03-15 21:01:20 -04:00
flat.h flat: fix data sections alignment 2009-05-29 08:40:02 -07:00
floppy.h
fpstate.h
ftrace.h ARM: 6319/1: ftrace: add Thumb-2 support to dynamic ftrace 2010-09-02 15:28:43 +01:00
futex.h ARM: 6384/1: Remove the domain switching on ARMv6k/v7 CPUs 2010-11-04 15:44:31 +00:00
glue.h ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
gpio.h
hardirq.h ARM: SMP: collect IPI and local timer IRQs for /proc/stat 2010-12-20 15:08:01 +00:00
highmem.h ARM: get rid of kmap_high_l1_vipt() 2010-12-19 12:56:46 -05:00
hw_breakpoint.h ARM: hw_breakpoint: unify single-stepping code for watchpoints and breakpoints 2010-12-06 11:55:57 +00:00
hw_irq.h arm: Use ARCH_IRQ_INIT_FLAGS 2010-10-16 22:57:38 +02:00
hwcap.h ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6 2010-07-09 14:41:35 +01:00
ide.h
io.h ARM: io: ensure inb/outb() et.al. are properly ordered on ARMv6+ 2011-01-31 10:53:42 +00:00
ioctl.h
ioctls.h ioctl: Use asm-generic/ioctls.h on arm (enables termiox) 2010-10-22 10:19:59 -07:00
ipcbuf.h
irq_regs.h
irq.h ARM: 6197/2: preliminary support for sparse IRQ 2010-07-09 14:41:33 +01:00
irqflags.h Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
Kbuild archs: replace unifdef-y with header-y 2010-08-14 22:26:51 +02:00
kdebug.h
kexec.h ARM: 6518/1: kexec: Fix crash_setup_regs() for ARMv7 and CONFIG_THUMB2_KERNEL 2010-12-04 11:00:53 +00:00
kgdb.h kgdb,arm: fix register dump 2010-10-29 13:14:40 -05:00
kmap_types.h kdb: core for kgdb back end (2 of 2) 2010-05-20 21:04:21 -05:00
kprobes.h
leds.h
limits.h
linkage.h
local64.h arch: Implement local64_t 2010-06-09 11:12:36 +02:00
local.h
localtimer.h ARM: localtimer: clean up local timer on hot unplug 2010-12-20 15:09:16 +00:00
locks.h
mach-types.h arm: move mach-types to include/generated 2009-12-12 13:08:14 +01:00
mc146818rtc.h
memblock.h ARM: fix memblock breakage 2010-10-27 21:41:39 +01:00
memory.h ARM: P2V: introduce phys_to_virt/virt_to_phys runtime patching 2011-02-17 23:27:32 +00:00
mman.h arm: add arch_mmap_check(), get rid of sys_arm_mremap() 2009-12-11 06:34:09 -05:00
mmu_context.h ARM: add a vma entry for the user accessible vector page 2010-10-01 22:35:19 -04:00
mmu.h ARM: 6490/1: MM: bugfix: initialize spinlock for init_mm.context 2010-11-23 22:46:12 +00:00
module.h ARM: P2V: introduce phys_to_virt/virt_to_phys runtime patching 2011-02-17 23:27:32 +00:00
msgbuf.h
mtd-xip.h
mutex.h
nwflash.h
outercache.h arm: Disable outer (L2) cache in kexec 2010-10-26 11:39:56 +05:30
page-nommu.h nommu: Remove the memory_start/end variables from ARM page-nommu.h 2009-07-24 12:35:01 +01:00
page.h ARM: pgtable: introduce pteval_t to represent a pte value 2010-11-26 20:45:47 +00:00
param.h
parport.h
pci.h ARM: 6058/1: Add support for PCI domains 2010-04-22 21:38:11 +01:00
percpu.h
perf_event.h irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
pgalloc.h ARM: pgtable: switch order of Linux vs hardware page tables 2010-12-22 11:05:32 +00:00
pgtable-hwdef.h
pgtable-nommu.h ARM: 5988/1: pgprot_dmacoherent() for non-mmu builds 2010-03-13 10:48:22 +00:00
pgtable.h ARM: pgtable: provide RDONLY page table bit rather than WRITE bit 2010-12-22 11:05:35 +00:00
pmu.h ARM: 6064/1: pmu: register IRQs at runtime 2010-05-17 11:53:57 +01:00
poll.h
posix_types.h
proc-fns.h ARM: Kill CONFIG_CPU_32 2009-12-18 16:07:53 +00:00
processor.h ARM: 6357/1: hw-breakpoint: add new ptrace requests for hw-breakpoint interaction 2010-09-08 10:05:00 +01:00
procinfo.h
ptrace.h ARM: 6357/1: hw-breakpoint: add new ptrace requests for hw-breakpoint interaction 2010-09-08 10:05:00 +01:00
resource.h
scatterlist.h asm-generic: remove ARCH_HAS_SG_CHAIN in scatterlist.h 2010-05-27 09:12:54 -07:00
sched_clock.h ARM: sched_clock: allow init_sched_clock() to be called early 2011-01-11 16:23:04 +00:00
seccomp.h ARM: SECCOMP support 2010-10-01 22:32:18 -04:00
sections.h
segment.h
sembuf.h
serial.h
setup.h ARM: Remove DISCONTIGMEM support 2010-07-16 10:57:35 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
sizes.h ARM: 6536/1: Add missing SZ_{32,64,128} 2010-12-24 09:37:58 +00:00
smp_plat.h Merge branches 'at91', 'dcache', 'ftrace', 'hwbpt', 'misc', 'mmci', 's3c', 'st-ux' and 'unwind' into devel 2010-10-18 22:34:25 +01:00
smp_scu.h [ARM] smp: separate SCU support code from realview 2009-05-17 19:00:37 +01:00
smp_twd.h ARM: localtimer: clean up local timer on hot unplug 2010-12-20 15:09:16 +00:00
smp.h ARM: SMP: consolidate the common parts of smp_prepare_cpus() 2010-12-20 15:09:08 +00:00
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h
sparsemem.h
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
spinlock.h ARM: 5897/1: spinlock: don't use deprecated barriers on ARMv7 2010-02-15 21:39:50 +00:00
stackprotector.h ARM: initial stack protector (-fstack-protector) support 2010-06-14 21:31:00 -04:00
stacktrace.h [ARM] 5382/1: unwind: Reorganise the stacktrace support 2009-02-12 13:21:17 +00:00
stat.h
statfs.h
string.h
swab.h ARM: 5772/1: Use REV and REV16 for byte swapping on ARMv6+ 2009-10-25 15:59:53 +00:00
system.h Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
tcm.h ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3 2009-09-15 22:11:05 +01:00
termbits.h tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
termios.h
therm.h
thread_info.h ARM: SECCOMP support 2010-10-01 22:32:18 -04:00
thread_notify.h ARM: Convert VFP/Crunch/XscaleCP thread_release() to exit_thread() 2009-12-18 14:53:41 +00:00
timex.h
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h Merge branches 'at91', 'dcache', 'ftrace', 'hwbpt', 'misc', 'mmci', 's3c', 'st-ux' and 'unwind' into devel 2010-10-18 22:34:25 +01:00
tls.h ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6 2010-07-09 14:41:35 +01:00
topology.h
traps.h Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
types.h
uaccess.h ARM: 6384/1: Remove the domain switching on ARMv6k/v7 CPUs 2010-11-04 15:44:31 +00:00
ucontext.h ARM: 6051/1: VFP: preserve the HW context when calling signal handlers 2010-04-14 11:11:30 +01:00
unaligned.h
unified.h Fix "W" macro in arch/arm/include/asm/unified.h 2009-09-18 23:30:11 +01:00
unistd.h ARM: 6343/1: wire up fanotify and prlimit64 syscalls on ARM 2010-09-01 10:06:08 +01:00
unwind.h [ARM] 5383/2: unwind: Add core support for ARM stack unwinding 2009-02-19 11:26:24 +00:00
user.h ARM: 6051/1: VFP: preserve the HW context when calling signal handlers 2010-04-14 11:11:30 +01:00
vfp.h
vfpmacros.h ARM: 6203/1: Make VFPv3 usable on ARMv6 2010-07-09 14:41:34 +01:00
vga.h
xor.h