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5a226c6f5c
linux/arch/mn10300/include/asm
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Mark Salter 5a226c6f5c MN10300: Map userspace atomic op regs as a vmalloc page 
The AM34 processor has an atomic operation that's the equivalent of LL/SC on
other architectures.  However, rather than being done through a pair of
instructions, it's driven by writing to a pair of memory-mapped CPU control
registers.

One set of these registers (AARU/ADRU/ASRU) is available for use by userspace,
but for userspace to access them a PTE must be set up to cover the region.
This is done by dedicating the first vmalloc region page to this purpose,
setting the permissions on its PTE such that userspace can access the page.

glibc is hardcoded to expect the registers to be there.

The way atomic ops are done through these registers is straightforward:

 (1) Write the address of the word you wish to access into AARU.  This causes
     the CPU to go and fetch that word and load it into ADRU.  The status bits
     are also cleared in ASRU.

 (2) The current data value is read from the ADRU register and modified.

 (3) To alter the data in RAM, the revised data is written back to the ADRU
     register, which causes the CPU to attempt to write it back.

 (4) The ASRU.RW flag (ASRU read watch), ASRU.LW flag (bus lock watch),
     ASRU.IW (interrupt watch) and the ASRU.BW (bus error watch) flags then
     must be checked to confirm that the operation wasn't aborted.  If any of
     the watches have been set to true, the operation was aborted.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2010-10-27 17:28:56 +01:00
..
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
atomic.h MN10300: Implement atomic ops using atomic ops unit 2010-10-27 17:28:52 +01:00
auxvec.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
bitops.h MN10300: Don't cast away the volatile in test_bit() 2010-10-27 17:28:36 +01:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h MN10300: Stop gcc from generating uninitialised variable warnings after BUG() 2009-04-15 13:55:13 -07:00
bugs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
busctl-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
byteorder.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
cache.h MN10300: Don't hard code the cacheline size in register defs 2010-10-27 17:28:39 +01:00
cacheflush.h MN10300: Allow some cacheflushes to be avoided if cache snooping is available 2010-10-27 17:28:46 +01:00
checksum.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
cpu-regs.h MN10300: Use the [ID]PTEL2 registers rather than [ID]PTEL for TLB control 2010-10-27 17:28:50 +01:00
cputime.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
current.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
delay.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
device.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
div64.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
dma-mapping.h dma-mapping: remove dma_is_consistent API 2010-08-11 08:59:21 -07:00
dma.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
dmactl-regs.h MN10300: Move DMA engine control reg defs to MN103E010 processor directory 2010-10-27 17:28:39 +01:00
elf.h MN10300: Make the FPU operate in non-lazy mode under SMP 2010-10-27 17:28:52 +01:00
emergency-restart.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
errno.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
exceptions.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
fb.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
fcntl.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
fpu.h MN10300: Make the FPU operate in non-lazy mode under SMP 2010-10-27 17:28:52 +01:00
frame.inc MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
ftrace.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
futex.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
gdb-stub.h MN10300: Provide a MN10300_CACHE_ENABLED config option 2010-10-27 17:28:42 +01:00
hardirq.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
highmem.h MN10300: Rename __flush_tlb*() to local_flush_tlb*() 2010-10-27 17:28:49 +01:00
hw_irq.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
intctl-regs.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
io.h MN10300: Add reads[bwl]() and writes[bwl]() 2010-10-27 17:28:37 +01:00
ioctl.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ioctls.h ioctl: Use asm-generic/ioctls.h on mn10300 (enables termiox) 2010-10-22 10:20:01 -07:00
ipc.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ipcbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
irq_regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
irq.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
irqflags.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
Kbuild Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
kdebug.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
linkage.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
local64.h arch: Implement local64_t 2010-06-09 11:12:36 +02:00
local.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mc146818rtc.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mman.h arch_mmap_check() on mn10300 2009-12-11 06:34:10 -05:00
mmu_context.h MN10300: SMP TLB flushing 2010-10-27 17:28:51 +01:00
mmu.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
module.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
msgbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mutex.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
nmi.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
page_offset.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
page.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
param.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
pci.h PCI: remove pcibios_scan_all_fns() 2009-09-09 13:29:18 -07:00
percpu.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable.h MN10300: Map userspace atomic op regs as a vmalloc page 2010-10-27 17:28:56 +01:00
pio-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
poll.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
posix_types.h MN10300: Fix size_t and ssize_t 2010-08-12 09:51:35 -07:00
processor.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
ptrace.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
reset-regs.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
resource.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
rtc-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
rtc.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
rwlock.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
scatterlist.h remove needless ISA_DMA_THRESHOLD 2010-08-07 18:15:50 +02:00
sections.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
sembuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
serial-regs.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
serial.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
setup.h headers_check fix: mn10300, setup.h 2009-06-14 11:51:12 +05:30
shmbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
shmparam.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
sigcontext.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
siginfo.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
signal.h MN10300: Fix SIGRTMAX 2010-09-23 10:20:57 -07:00
smp.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
spinlock_types.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
spinlock.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
stat.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
statfs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
string.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
swab.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
system.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
termbits.h tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
termios.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
thread_info.h add descriptive comment for TIF_MEMDIE task flag declaration. 2010-05-14 11:13:27 +02:00
timer-regs.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
timex.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
tlb.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
tlbflush.h MN10300: SMP TLB flushing 2010-10-27 17:28:51 +01:00
topology.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
types.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
uaccess.h MN10300: And Panasonic AM34 subarch and implement SMP 2010-10-27 17:28:55 +01:00
ucontext.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
unaligned.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
unistd.h Add generic sys_ipc wrapper 2010-03-12 15:52:32 -08:00
user.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
vga.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
xor.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00