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Paul Burton 94c2b6aff4 mips_malta: support up to 2GiB RAM 
A Malta board can support up to 2GiB of RAM. Since the unmapped kseg0/1
regions are only 512MiB large & the latter 256MiB of those are taken up
by the IO region, access to RAM beyond 256MiB must be done through a
mapped region. In the case of a Linux guest this means we need to use
highmem.

The mainline Linux kernel does not support highmem for Malta at this
time, however this can be tested using the linux-mti-3.8 kernel branch
available from:

  git://git.linux-mips.org/pub/scm/linux-mti.git

You should be able to boot a Linux kernel built from the linux-mti-3.8
branch, with CONFIG_HIGHMEM enabled, using 2GiB RAM by passing "-m 2G"
to QEMU and appending the following kernel parameters:

  mem=256m@0x0 mem=256m@0x90000000 mem=1536m@0x20000000

Note that the upper half of the physical address space of a Malta
mirrors the lower half (hence the 2GiB limit) except that the IO region
(0x10000000-0x1fffffff in the lower half) is not mirrored in the upper
half. That is, physical addresses 0x90000000-0x9fffffff access RAM
rather than the IO region, resulting in a physical address space
resembling the following:

  0x00000000 -> 0x0fffffff  RAM
  0x10000000 -> 0x1fffffff  I/O
  0x20000000 -> 0x7fffffff  RAM
  0x80000000 -> 0x8fffffff  RAM (mirror of 0x00000000 -> 0x0fffffff)
  0x90000000 -> 0x9fffffff  RAM
  0xa0000000 -> 0xffffffff  RAM (mirror of 0x20000000 -> 0x7fffffff)

The second mem parameter provided to the kernel above accesses the
second 256MiB of RAM through the upper half of the physical address
space, making use of the aliasing described above in order to avoid
the IO region and use the whole 2GiB RAM.

The memory setup may be seen as 'backwards' in this commit since the
'real' memory is mapped in the upper half of the physical address space
and the lower half contains the aliases. On real hardware it would be
typical to see the upper half of the physical address space as the alias
since the bus addresses generated match the lower half of the physical
address space. However since the memory accessible in the upper half of
the physical address space is uninterrupted by the IO region it is
easiest to map the RAM as a whole there, and functionally it makes no
difference to the target code.

Due to the requirements of accessing the second 256MiB of RAM through
a mapping to the upper half of the physical address space it is usual
for the bootloader to indicate a maximum of 256MiB memory to a kernel.
This allows kernels which do not support such access to boot on systems
with more than 256MiB of RAM. It is also the behaviour assumed by Linux.
QEMUs small generated bootloader is modified to provide this behaviour.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
 		2013-09-09 18:42:22 +02:00
QMP net: add support of mac-programming over macvtap in QEMU side 2013-07-15 21:23:08 +03:00
audio aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
backends aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
block Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-09-03 12:32:46 -05:00
bsd-user gdbstub: Change gdb_handlesig() argument to CPUState 2013-07-23 02:41:33 +02:00
default-configs default-configs: Fix A9MP and A15MP config names 2013-08-20 14:54:32 +01:00
disas disas/ppc.c: Fix little endian disassembly 2013-09-02 10:06:41 +02:00
docs qcow2: Add corrupt bit 2013-08-30 15:48:43 +02:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu softfloat: Fix shift128Right for shift counts 64..127 2013-06-10 11:36:12 -05:00
fsdev fsdev: Fix potential memory leak 2013-07-09 13:38:56 -05:00
gdb-xml gdb-xml: fix hacks in powerpc register numbering 2009-07-12 23:42:05 +02:00
hw mips_malta: support up to 2GiB RAM 2013-09-09 18:42:22 +02:00
include memory: Provide separate handling of unassigned io ports accesses 2013-09-05 18:11:43 +02:00
libcacard misc: Fix some typos in names and comments 2013-09-01 18:59:24 +04:00
linux-headers misc: Fix some typos in names and comments 2013-09-01 18:59:24 +04:00
linux-user cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
net aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
pc-bios Update OpenBIOS images 2013-07-30 23:11:07 +01:00
pixman@97336fad32 qapi: move include files to include/qobject/ 2012-12-19 08:31:31 +01:00
po po: Update all *.po files 2013-08-07 12:48:00 -05:00
qapi OptsVisitor: don't try to flatten overlong integer ranges 2013-08-20 11:52:00 -04:00
qga qga: escape cmdline args when registering win32 service (CVE-2013-2231) 2013-07-25 14:49:04 -05:00
qobject Implement qdict_flatten() 2013-07-26 22:01:31 +02:00
qom QOM CPUState refactorings / X86CPU 2013-09-03 12:33:32 -05:00
roms Update OpenBIOS images 2013-07-30 23:11:07 +01:00
scripts qapi-types.py: Split off generate_struct_fields() 2013-08-30 15:28:52 +02:00
slirp slirp/arp_table.c: Avoid shifting into sign bit of signed integers 2013-09-01 19:09:09 +04:00
stubs aio / timers: Rearrange timer.h & make legacy functions call non-legacy 2013-08-22 19:14:24 +02:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-arm Merge remote-tracking branch 'mjt/trivial-patches' into staging 2013-09-03 12:31:44 -05:00
target-cris tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-i386 target-i386: Use #defines instead of magic numbers for CPUID cache info 2013-09-03 12:25:56 +02:00
target-lm32 target: Include softmmu_exec.h where forgotten 2013-09-02 09:08:30 -07:00
target-m68k tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-microblaze tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-mips cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
target-moxie target: Include softmmu_exec.h where forgotten 2013-09-02 09:08:30 -07:00
target-openrisc tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-ppc cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
target-s390x cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
target-sh4 tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-sparc tcg: Change tcg_gen_exit_tb argument to uintptr_t 2013-09-02 09:08:30 -07:00
target-unicore32 target: Include softmmu_exec.h where forgotten 2013-09-02 09:08:30 -07:00
target-xtensa target: Include softmmu_exec.h where forgotten 2013-09-02 09:08:30 -07:00
tcg Merge remote-tracking branch 'mjt/trivial-patches' into staging 2013-09-03 12:31:44 -05:00
tests Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-09-03 12:32:46 -05:00
trace trace: Add ftrace tracing backend 2013-05-03 13:58:09 +02:00
ui gtk: Remove unused include statements which are not portable 2013-08-27 14:21:16 +02:00
util option: Add assigned flag to QEMUOptionParameter 2013-08-30 15:28:52 +02:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore OptsVisitor: introduce unit tests, with test cases for range flattening 2013-08-20 11:52:00 -04:00
.gitmodules pc-bios: Update palcode-clipper 2013-07-18 08:17:42 -07:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
CODING_STYLE Replace Qemu by QEMU in internal documentation 2012-04-07 13:58:25 +00:00
COPYING
…
COPYING.LIB
…
Changelog fix some common typos 2012-05-14 07:27:24 +02:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
LICENSE LICENSE: clarify 2013-08-12 09:15:12 -05:00
MAINTAINERS MAINTAINERS: Take over 0.15 maintenance 2013-08-22 17:27:43 +02:00
Makefile w32: Fix broken out-of-tree builds (missing version.o) 2013-08-27 14:21:16 +02:00
Makefile.objs w32: Add missing version.o to all executables (fix regression) 2013-08-12 09:19:05 -05:00
Makefile.target build: do not use TARGET_ARCH 2013-06-14 15:33:10 +01:00
README Update README 2011-12-11 17:50:43 -06:00
VERSION Open up 1.7 development branch 2013-08-15 15:41:13 -05:00
aio-posix.c aio / timers: Convert aio_poll to use AioContext timers' deadline 2013-08-22 19:10:28 +02:00
aio-win32.c aio-win32: replace incorrect AioHandler->opaque usage with ->e 2013-08-22 22:04:54 +02:00
arch_init.c cpu: Replace qemu_for_each_cpu() 2013-09-03 12:25:55 +02:00
async.c aio / timers: aio_ctx_prepare sets timeout from AioContext timers 2013-08-22 19:10:28 +02:00
balloon.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
block-migration.c block-migration: efficiently encode zero blocks 2013-07-19 12:29:21 +08:00
block.c block: Remove redundant assertion 2013-08-30 15:28:52 +02:00
blockdev-nbd.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
blockdev.c Revert "block: Disable driver-specific options for 1.6" 2013-08-30 15:28:52 +02:00
blockjob.c aio / timers: convert block_job_sleep_ns and co_sleep_ns to new API 2013-08-22 19:14:24 +02:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
configure Merge remote-tracking branch 'mjt/trivial-patches' into staging 2013-09-03 12:31:44 -05:00
coroutine-gthread.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
coroutine-sigaltstack.c Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-02-26 07:44:39 -06:00
coroutine-ucontext.c Fix warnings suppressors to honor --disable-werror 2013-04-17 10:28:04 -05:00
coroutine-win32.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
cpu-exec.c tcg: Fix next_tb type in cpu_exec 2013-09-02 09:08:29 -07:00
cpus.c cpu: Replace qemu_for_each_cpu() 2013-09-03 12:25:55 +02:00
cputlb.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
device-hotplug.c hw: move device-hotplug.o to toplevel, compile it once 2013-03-01 13:57:13 +01:00
device_tree.c device_tree: Add qemu_devtree_setprop_sized_cells() utility functions 2013-07-19 12:58:46 +01:00
disas.c disas: Implement fallback to dump object code as hex 2013-08-24 07:26:45 +02:00
dma-helpers.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
dump.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
exec.c exec: do tcg_commit only when tcg_enabled 2013-09-05 18:11:52 +02:00
gdbstub.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
hmp-commands.hx Merge remote-tracking branch 'luiz/queue/qmp' into staging 2013-08-30 12:26:04 -05:00
hmp.c aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
hmp.h block: add drive_backup HMP command 2013-07-15 09:49:00 +02:00
iohandler.c iohandler: switch to GPollFD 2013-02-21 16:17:31 -06:00
ioport.c memory: Provide separate handling of unassigned io ports accesses 2013-09-05 18:11:43 +02:00
kvm-all.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
kvm-stub.c Merge remote-tracking branch 'qemu-kvm/uq/master' into stable-1.5 2013-08-29 17:21:51 -05:00
main-loop.c aio / timers: Rearrange timer.h & make legacy functions call non-legacy 2013-08-22 19:14:24 +02:00
memory.c Revert "memory: Return -1 again on reads from unsigned regions" 2013-09-05 18:11:48 +02:00
memory_mapping.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
migration-exec.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-fd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-rdma.c rdma: silly ipv6 bugfix 2013-09-01 19:03:43 +04:00
migration-tcp.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-unix.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration.c aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
monitor.c QOM CPUState refactorings / X86CPU 2013-09-03 12:33:32 -05:00
nbd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
os-posix.c Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
os-win32.c qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32 2013-04-12 18:27:16 +02:00
page_cache.c remove some double-includes 2013-05-18 16:35:12 +04:00
qapi-schema.json qapi: Rename ChardevBackend member "memory" to "ringbuf" 2013-07-29 10:37:12 -05:00
qdev-monitor.c qemu-help: Sort devices by logical functionality 2013-07-29 10:37:09 -05:00
qdict-test-data.txt Introduce QDict test data file 2009-09-04 09:37:34 -05:00
qemu-bridge-helper.c qemu-bridge-helper: force usage of a very high MAC address for the bridge 2013-03-28 12:58:52 -05:00
qemu-char.c Merge remote-tracking branch 'stefanha/block' into staging 2013-08-26 09:19:50 -05:00
qemu-coroutine-io.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-coroutine-lock.c block: Repair the throttling code. 2013-07-29 17:07:37 +02:00
qemu-coroutine-sleep.c aio / timers: convert block_job_sleep_ns and co_sleep_ns to new API 2013-08-22 19:14:24 +02:00
qemu-coroutine.c coroutine: stop using AioContext in CoQueue 2013-05-24 16:17:56 +02:00
qemu-doc.texi doc: we use seabios, not bochs bios 2013-06-28 22:10:34 +04:00
qemu-img-cmds.hx qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-img.c ignore SIGPIPE in qemu-img and qemu-io 2013-08-06 10:41:56 +02:00
qemu-img.texi qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-io-cmds.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-io.c ignore SIGPIPE in qemu-img and qemu-io 2013-08-06 10:41:56 +02:00
qemu-log.c qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
qemu-nbd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-nbd.texi Add -f FMT / --format FMT arg to qemu-nbd 2013-04-15 14:29:20 -05:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx Revert "chardev: Make the name of memory device consistent" 2013-07-29 10:37:11 -05:00
qemu-seccomp.c seccomp: add arch_prctl() to the syscall whitelist 2013-07-29 19:56:52 -05:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c aio / timers: Remove legacy interface 2013-08-22 19:14:24 +02:00
qemu.nsi w32, w64: Add build rule for installer 2013-07-29 11:43:37 +02:00
qemu.sasl Fix command example in qemu.sasl 2013-07-19 12:52:03 +04:00
qmp-commands.hx qmp: fix integer usage in examples 2013-09-01 19:46:58 +04:00
qmp.c QMP: Add cpu-add command 2013-05-01 13:06:07 +02:00
qtest.c qtest: Fix FMT_timeval vs time_t 2013-09-02 09:08:29 -07:00
readline.c monitor: avoid use of global *cur_mon in readline_completion() 2013-08-30 07:41:14 -04:00
rules.mak win32: fix compilation again 2013-05-03 12:04:40 -05:00
savevm.c aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
spice-qemu-char.c qemu-char: don't issue CHR_EVENT_OPEN in a BH 2013-06-10 11:38:37 -05:00
tcg-runtime.c tcg: Implement multiword multiply helpers 2013-02-23 17:25:28 +00:00
tci.c tcg: Change tcg_qemu_tb_exec return to uintptr_t 2013-09-02 09:08:29 -07:00
thread-pool.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
tpm.c tpm.c: Don't try to put -1 in a variable of type TpmModel 2013-07-29 10:37:10 -05:00
trace-events Merge remote-tracking branch 'kraxel/usb.88' into staging 2013-09-03 12:31:30 -05:00
translate-all.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
translate-all.h cputlb: Pass CPUState to cpu_unlink_tb() 2013-02-16 14:51:00 +01:00
user-exec.c linux-user: fix segmentation fault passing with h2g(x) != x 2013-07-23 17:28:28 +03:00
version.rc w32: Add an icon resource 2013-08-27 14:21:16 +02:00
vl.c pc,pci,virtio fixes and cleanups 2013-09-03 12:31:07 -05:00
xbzrle.c Move XBZRLE encoding code to a separate file to allow testing 2013-02-01 08:32:20 +01:00
xen-all.c aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
xen-mapcache.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
xen-stub.c Allow use of pc machine type (accel=xen) for Xen HVM domains. 2013-06-25 12:00:48 +00:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu.org

- QEMU team