1dbafa8950
Tidied up debugging messages
2006-05-27 13:38:49 +00:00
aa2468babe
Added abstraction layer for a three-wire serial device (e.g. the EEPROM
...
used on RTL8139 cards).
2006-05-26 15:39:24 +00:00
9f86754f90
Updated to work with libprefix.
2006-05-25 22:04:47 +00:00
29340d7728
Documented the fact that the prefix can prot_call(main) without
...
worrying about its stack being destroyed during the Etherboot run.
2006-05-25 22:04:17 +00:00
0479e9f541
relocate.o is now dragged in by the objects that require it; there is no
...
need for a CONFIG_RELOCATE.
2006-05-25 01:34:13 +00:00
3204a1e941
Removed some obsolete INIT_XXX constants.
2006-05-25 01:09:06 +00:00
d82f71efd0
Also hide base memory region from E820 map.
2006-05-25 00:10:58 +00:00
89da833c5d
init_librm() and prot_call() are now real-mode far calls.
...
install() now calls relocate(), moves the protected-mode code to the new
location, and calls hide_etherboot().
2006-05-25 00:06:45 +00:00
4d81b48504
Has been obsolete for a while.
2006-05-25 00:04:37 +00:00
1966945a5d
Update relocate() to work with get_memmap().
...
Change semantics; relocate() now just finds a suitable location; it
doesn't actually perform the relocation itself. Code in libprefix does
the copy in flat real mode.
2006-05-25 00:04:13 +00:00
f939ff7cb5
Fix printf format warning error
2006-05-25 00:02:27 +00:00
3bd3c13c7b
Why should pushal/popal put the registers on the stack in a logical
...
order?
2006-05-25 00:01:46 +00:00
dd75965057
Typo.
2006-05-25 00:00:53 +00:00
e4f8d6eed7
Add a "count" field to struct memory_map.
2006-05-25 00:00:30 +00:00
986f6ffff1
Define a struct memory_map with a fixed number of entries, rather than
...
requiring each caller to decide how many entries it wants to permit.
2006-05-24 14:41:27 +00:00
edcf89e2b0
Remove the automatic segment register save and restore; most users of
...
REAL_CODE() don't need it.
2006-05-24 14:11:36 +00:00
02cf755f3f
Removed REAL_EXEC(); there is no longer any code using it.
2006-05-24 14:10:15 +00:00
103aff3ae2
Added potentially required "\n\t" on the end of asm_code_str
2006-05-24 14:06:28 +00:00
190276a8b6
NBI is due for removal
2006-05-24 13:53:35 +00:00
52125e158c
Will be replaced with a block-device implementation.
2006-05-24 13:52:46 +00:00
8110f9b082
Updated to REAL_CODE()
2006-05-24 13:50:40 +00:00
595f161b51
Updated to REAL_CODE().
...
int13_boot() now does its own segment register save and restore, ready
for the removal of segment register restoration from the libkir
generic code.
2006-05-24 13:48:16 +00:00
e8550035af
Updated to REAL_CODE()
2006-05-24 13:28:39 +00:00
c4d688c005
Updated to REAL_CODE().
2006-05-24 13:24:22 +00:00
04d6005d77
Update to REAL_CODE()
2006-05-24 12:45:50 +00:00
6631f46999
Updated to REAL_CODE().
2006-05-24 12:32:57 +00:00
53935e9dc6
Set carry flag before calling INT 15,e801 and INT 15,e820.
...
Ignore carry flag for INT 15,88; the Ralf Brown interrupt list says
that CF is unreliable for this call.
2006-05-24 12:19:16 +00:00
7a53d07027
Split out REAL_CODE() from REAL_EXEC(), preparatory to removing REAL_EXEC
...
completely.
2006-05-24 09:51:04 +00:00
83d80d9e79
Remove references to obsoleted REAL_CALL from documentation.
2006-05-24 09:16:48 +00:00
3b525385af
Removed REAL_FRAGMENT and REAL_CALL, and left just REAL_EXEC (which is
...
the only one we actually use). This allows REAL_EXEC fragments to
contain proper references to constraints (e.g. "%w0"), rather than having
to force the use of specific registers.
Note that the "num_constraints" parameter is now completely obsolete, and
that we can probably reduce the syntax to something like
__asm__ __volatile__ ( REAL_CODE ( "asm statements" )
: output constraints
: input constraints
: clobber );
which would look much more natural, and avoid the need to always specify
a clobber list.
Add userptr_t to libkir.h, to allow it to at least compile.
2006-05-24 09:14:44 +00:00
77a65075a6
Replaced memsizes.c with smaller memmap.c, taking advantage of __data16,
...
and creating a memory map that's easier to work with than the E820 map.
2006-05-24 01:37:46 +00:00
5e80847827
Code to install the new E820 mangler (which doesn't require copying
...
down to base memory, since it is now in the base-memory-resident
.text16 section).
2006-05-23 23:47:05 +00:00
897313007b
Add __{text,data}16_array, since there's no way I can see to make the
...
usual __{text,data}16 trick work with arrays. gcc seems to accept the
__asm__ ( asmlabel ) only after the [] of the array declaration, not
before.
2006-05-23 23:42:45 +00:00
5ec2b2c251
Cope with regions bigger than 4GB.
...
We now split e820 regions around ourselves, rather than just
truncating the e820 region. This avoids the worst-case scenario of
losing all memory over 4GB.
It's more important to get the memory map right now that we're
expecting to still be loaded when the OS starts in several situations
(e.g. Linux with UNDI driver, any OS with iSCSI/AoE boot, etc.).
2006-05-23 23:33:37 +00:00
bef8874842
- implemented printw (formatted string output, a la printf)
...
- implemented hline/vline (part of wborder family)
- screen cursor now relocates at same time as window cursor when
restoring after a non-wrapping function
2006-05-22 17:03:41 +00:00
84a493b88d
Allow vcprintf() to be called by external code such as the curses library.
...
Also trim another eight bytes from vsprintf.o. :)
2006-05-22 15:41:01 +00:00
f778500739
- fixes to _wputch to get positioning and wrap working properly
...
- fixes to wborder (same)
- addition of a few minor functions
2006-05-22 13:10:19 +00:00
95956443e1
Fixed debug code
2006-05-21 16:04:41 +00:00
9dfb9d84b4
Made the LBA48 example clearer.
2006-05-21 16:02:38 +00:00
80958ff69c
Added (untested) support for ATA devices. This code should be generic
...
enough to support both real IDE chipsets and AoE.
2006-05-21 16:01:23 +00:00
ca2519cea3
Refactored to reduce code size; now down from 1304 to 1105 bytes.
...
Tidied up debug messages; the log now contains one line per INT 13
operation, looking like
INT 13,08 (80): Get drive parameters
INT 13,02 (80): Read: C/H/S 0/47/14 = LBA 0xb9e <-> 1084:0000 (count 106)
2006-05-20 15:33:32 +00:00
af4aacb978
Added missing @file block
2006-05-20 13:25:07 +00:00
4d0a0f822d
Use insb/outsb; it's marginally faster.
2006-05-20 12:28:44 +00:00
402ba15c64
READ CAPACITY (16) turns out to be an optional command (even though
...
READ(16) is mandatory); we must use READ CAPACITY (10) first and then
use READ CAPACITY (16) if the READ CAPACITY (10) returns "out of range".
2006-05-19 18:54:38 +00:00
444b885a7d
Add EOVERFLOW==ERANGE
2006-05-19 18:53:12 +00:00
b9cbae58fa
Expert advice tells me that we *do* have to explicitly state the
...
options even when we want to use the defaults.
2006-05-19 17:50:49 +00:00
acf572905c
- made some of the bit shifting attribute access simpler (in my mind)
...
- added extern declarations for global vars
- removed comments from static inlines (too time consuming to do them
all, considering all so far have been due to the ridiculous amount of
redundancy within the API spec)
- removed a few more extern func decls for funcs that cannot be
implemented at this time
2006-05-19 16:22:10 +00:00
d166dc57ab
- made _wputch wrap lines as well as cols (wraps back to line 0, as we have not way to scroll...)
...
- implemented color_content, wborder, wblrtobot, wclrtoeol, wcolor_set and several small functions
- added rest of expected global variables
2006-05-19 16:18:08 +00:00
d48d0fb1bb
Add the concept of a "user pointer" (similar to the void __user * in
...
the kernel), which encapsulates the information needed to refer to an
external buffer. Under normal operation, this can just be a void *
equivalent, but under -DKEEP_IT_REAL it would be a segoff_t equivalent.
Use this concept to avoid the need for bounce buffers in int13.c,
which reduces memory usage and opens up the possibility of using
multi-sector reads.
Extend the block-device API and the SCSI block device implementation
to support multi-sector reads.
Update iscsi.c to use user buffers.
Move the obsolete portions of realmode.h to old_realmode.h.
MS-DOS now boots an order of magnitude faster over iSCSI (~10 seconds
from power-up to C:> prompt in bochs).
2006-05-19 15:06:51 +00:00
0ab92faedb
Use typeof(sizeof(...)) to define a size_t. This stops gcc complaining
...
about format errors for %zX arguments.
2006-05-19 14:51:59 +00:00
c69c1ec540
Documented login parameters that we negotiate.
2006-05-19 00:31:42 +00:00
a280587cde
iSCSI writes seem to be working (at least, the ethereal trace shows no
...
errors; still need to verify data integrity).
SCSI response PDUs are handled: status and sense data (if available) are
returned via the scsi_command structure.
Updated iSCSI session parameter usage.
2006-05-19 00:20:08 +00:00
b531bd2bda
All uses iscsi_state were removed some time ago; removing the
...
declaration.
2006-05-18 21:38:16 +00:00
53b682f3a2
Re-enable -Wformat, since our printf() is now more standards-conformant.
2006-05-18 21:23:38 +00:00
2814681d20
all window primitives implemented
2006-05-18 17:51:19 +00:00
813a052dc3
Set ErrorRecoveryLevel=0 (we don't want to have to handle it).
2006-05-17 17:41:50 +00:00
61d7b8a5ef
Added missing drivers/scsi
2006-05-17 17:31:18 +00:00
a4143e8c87
Split debug functions out into core/debug.c, so that they can be
...
automatically linked in on demand.
Corrected warnings in misc.c. strtoul() really should be
unsigned long strtoul ( const char *p, const char **endp, int base )
but such is not the ANSI standard.
2006-05-17 17:16:24 +00:00
6b6096d28b
Strip down i386 PCI configuration space I/O to the bare minimum. A
...
typical build will now include 880 bytes of PCI support code, compared to
2327 bytes in Etherboot 5.4.
(There is a slight cost of around 5 extra bytes per access to a
non-constant config space address; this should be an overall win.
Driver-specific accesses will usually be to constant addresses, for
which there is no additional cost.)
2006-05-17 01:12:11 +00:00
15ee09ed10
Restructured PCI subsystem to fit the new device model.
...
Generic PCI code now handles 64-bit BARs correctly when setting
"membase"; drivers should need to call pci_bar_start() only if they want
to use BARs other than the first memory or I/O BAR.
Split rarely-used PCI functions out into pciextra.c.
Core PCI code is now 662 bytes (down from 1308 bytes in Etherboot 5.4).
284 bytes of this saving comes from the pci/pciextra split.
Cosmetic changes to lots of drivers (e.g. vendor_id->vendor in order to
match the names used in Linux).
2006-05-16 15:12:06 +00:00
fcdab6299c
Missed a reference to heap.h.
2006-05-16 15:01:26 +00:00
0afa9db2de
Tear out old heap code, replace with code that simply allocates memory
...
for use by malloc().
This breaks the image-loading code (which previously used the heap to
allocate the buffer for downloading the image), but that's not a major
concern since I'm going to tear out all the image formats within the next
couple of days anyway. Byebye, NBI! :)
2006-05-16 15:00:36 +00:00
689218618f
Fix typo
2006-05-16 14:42:43 +00:00
441189c6f8
Kill off the "all devices are boot devices" idea
2006-05-16 14:42:15 +00:00
7cd0390013
Add list_for_each_entry_safe.
2006-05-16 14:14:31 +00:00
ceba6ecb75
Added generic device model.
2006-05-16 14:10:21 +00:00
6b514393d3
Change movetoyx(), putc() and getc() to methods of the screen.
2006-05-15 09:51:18 +00:00
a2799051b0
fixed build error (danjlynch, repeat: this is *not* perl, this is *not* perl...)
2006-05-15 09:34:27 +00:00
dccc6aed3a
lightweight xcurses implementation for etherboot (Michael made me do it...)
2006-05-15 09:29:48 +00:00
295e11b2b0
Add INT 13,41 (extensions installation check). LILO's MBR now uses
...
linear calls to load the MS-DOS boot sector in my test setup.
2006-05-14 23:46:28 +00:00
f25731d08f
Split "iSCSI as a SCSI device" out from "iSCSI as a TCP protocol".
2006-05-14 23:29:16 +00:00
29fb77b0a4
Fix a couple of minor typos.
2006-05-14 18:17:29 +00:00
6e42cb95bd
Also capture INT 19 as a failure path, to allow for boot sectors that
...
don't conform to BBS (e.g. the one created by mkdosfs).
2006-05-14 14:13:55 +00:00
4435667a00
Add int13_boot(), to allow booting from INT 13 emulated drives.
2006-05-14 13:44:47 +00:00
b4f941b257
Specify attributes on .text16.
2006-05-14 13:39:27 +00:00
eb6b8e8d70
Handle the '"%c", 0' case correctly.
2006-05-14 11:55:30 +00:00
efd6281a35
Correctly handle zero-length buffers.
2006-05-14 11:18:42 +00:00
25f5d114a0
Updated documentation.
...
Shaved around 100 bytes off vsprintf.o. It's now 50 bytes smaller than
the old implementation and provides much more conformant semantics,
including the ability to return the number of characters that would have
been printed to the string had the buffer been big enough. (iSCSI needs
this functionality).
2006-05-14 03:31:20 +00:00
2421723a15
Rewrote printf and friends to better support standard C semantics.
2006-05-14 02:51:55 +00:00
f99e7a375e
At least cope with "%llx" by reading the correct-sized va_arg from the
...
stack, even if we don't yet print it out.
At some point, vsprintf() needs to be fixed up so that it can correctly
cope with limited-sized buffers (i.e. vsnprintf), long longs, and
standard format specifiers (e.g. "%04x"). We should also remove the
special types (MAC addresses and IP addresses). This would then enable
us to use gcc's ability to type-check printf format strings.
2006-05-13 11:50:52 +00:00
21493646c2
Moved to net/tcp/iscsi.c.
2006-05-13 11:45:49 +00:00
5080668704
Provide access to rm_cs and rm_ds from protected-mode code.
2006-05-13 11:45:31 +00:00
dc8d429ec6
Provide a global counter for the number of interrupts hooked.
2006-05-13 11:44:53 +00:00
63499e9cfd
Allow re-entrancy and provide a global counter of the number of
...
interrupts hooked.
2006-05-13 11:44:11 +00:00
d822b3d4cd
Define BIOS data segment in bios.h
2006-05-13 11:43:07 +00:00
a27defa483
Add flag definitions.
2006-05-13 11:42:07 +00:00
d2c22ec9bb
Add INT 13 emulation layer (which provides an interface to gPXE block
...
devices).
2006-05-13 11:41:36 +00:00
1ad72e0e79
Add 64-bit byte-swapping operations.
2006-05-13 11:40:39 +00:00
5009f8d6a2
Provide a SCSI device interface to the iSCSI protocol
2006-05-13 11:39:46 +00:00
f33f01c126
Defined SCSI device interface, and added SCSI block device
...
implementation.
2006-05-13 11:37:50 +00:00
8638a5e471
Defined a block device interface.
2006-05-13 11:36:30 +00:00
1838b58c3f
Add drivers/block and arch/i386/interface/pcbios
2006-05-13 11:35:29 +00:00
568cad0ddc
(Redoing check-in lost by SourceForge's failure.)
2006-05-13 11:30:03 +00:00
8a229a16f6
(Redoing check-in lost by SourceForge's failure.)
...
Moved to net/
2006-05-13 11:24:25 +00:00
847f38f4ac
(Redoing check-in lost by SourceForge's failure.)
...
Add method for hooking real-mode interrupt vectors.
2006-05-13 11:19:06 +00:00
f7b963da51
(Redoing check-in lost by SourceForge's failure.)
...
Use .text16.data section with "aw" attributes, to avoid section type
conflicts when placing both code and data into .text16.
Add __from_{text16,data16}.
2006-05-13 11:11:55 +00:00
97d265f8dc
(Redoing check-in lost by SourceForge's failure.)
...
Avoid optimisation errors under -fstrict-aliasing.
2006-05-13 11:10:24 +00:00
fdb983d473
Preserve the whole of %esp across prot_call(). We have to split this
...
between the low half stored in the static variable rm_sp, and the high
half stored on the prot_call() stack, because:
Just using the stack would screw up when a prot_call()ed routine
executes a real_call(); it would have no way to find the current top of
the RM stack.
Extending rm_sp to rm_esp would not be safe, because the guarantee that
rm_sp must return to the correct value by the time an external
real-mode call returns applies only to %sp, not to %esp.
2006-05-06 19:44:23 +00:00
f8e087767b
Allow access to variables in .text16 as well as .data16. Chained
...
interrupt vectors, for example, will be easiest to handle if placed in
.text16.
2006-05-06 18:57:31 +00:00
c10d1aa9d7
Preserve GDT across prot_call().
2006-05-06 18:52:27 +00:00
dcc1b0054e
This line should not have been checked in
2006-05-04 23:22:42 +00:00
832807726a
Add infrastructure to support access to .data16 (and .text16) variables
...
from protected-mode code.
Set up %ds to point to .data16 in prot_to_real, so that code specified
via REAL_EXEC() and friends can access variables in .data16.
Move most real-mode librm variables from .text16 to .data16.
2006-05-04 23:14:06 +00:00
f4429533a6
Added methods for efficiently declaring and accessing variables in
...
.data16. librm will need to supply "char *data16", i.e. the virtual
address of the start of .data16.
2006-05-04 17:00:20 +00:00
f8f75cef5b
BSS is now zeroed by libprefix (along with the otherwise non-zeroable
...
portions such as the stack) during the installation process.
init_fns() are called from main(). We need to think about initial
control flow some more.
2006-05-02 21:10:45 +00:00
cc23057b59
Typo
2006-05-02 21:09:29 +00:00
10c28a51bd
Create two easy-to-use entry points in libprefix: install and
...
install_prealloc. I *think* these will suffice for all the 16-bit
prefixes.
2006-05-02 20:51:07 +00:00
9e1dd6402d
<name>_size variable is no longer needed, since we don't copy the code.
...
However, it's worth adding a .size directive so that objdump reports the
correct sizes for the code fragments.
2006-05-02 16:38:46 +00:00
9fcded3d23
Towards a(nother) new real-mode infrastructure, in which we take
...
advantage of the fact that we have to have a permanently-resident block
in base memory.
2006-05-02 15:41:21 +00:00
8f62b39c03
Move stack out to separate object, so that having a stack doesn't drag in
...
setup.S.
2006-05-02 14:57:48 +00:00
5463169c1a
Verified as working
2006-05-02 14:04:21 +00:00
d081d65d48
This should be much more elegant: we use flat real mode for the
...
highmem data, so decompress16 will be able to unpack blocks bigger
than 64kB.
2006-05-01 22:35:19 +00:00
cc8821a443
Checking in because I don't want to lose this rather neat code for
...
running the decompresser in 16:16 protected mode using the real-mode
stack. However, there's an even simpler way to do it...
2006-05-01 21:26:44 +00:00
2462047128
Typo
2006-04-30 18:19:39 +00:00
9e1becaf8a
Merge TCP aborted(), timedout() and closed() methods into a single
...
closed() method with a reason code.
2006-04-30 16:59:45 +00:00
8afb6303fb
Half-way tidy
2006-04-30 15:23:29 +00:00
04b6a1e004
Make all TCP methods optional; at least FTP data is a read-only
...
connection and so legitimately ignores acked() and senddata().
2006-04-30 13:20:40 +00:00
aec0e127d2
Proof-of-concept FTP implementation
2006-04-30 12:02:07 +00:00
a42092d2a0
Add a temporary snprintf, so that safely-written code can at least
...
compile, even if it won't yet be safe.
2006-04-30 12:01:31 +00:00
8df7e74990
Fix up prototype of strtoul() to match POSIX.
2006-04-30 11:45:38 +00:00
01bd78d62a
Created net/tcp and moved hello.c there
2006-04-30 09:34:11 +00:00
7af478b30d
Make tcp_connect() void; it will eventually have no failure case.
2006-04-30 02:13:52 +00:00
9c9208a132
Put the TCP connection periodic processing in tcp.c, where it belongs.
2006-04-30 02:08:42 +00:00
178b0a7e5e
Consistency
2006-04-30 01:35:01 +00:00
592a5a99c8
Moved uIP and tcp.c from proto/ to net/
2006-04-30 01:16:37 +00:00
352bf1bda2
Move init.h to gpxe/init.h.
2006-04-30 01:08:52 +00:00
bac97eb979
Change semantics of network API so that packet-absorbing calls *always*
...
take ownership of the packet, rather than doing so only if they return
success. This breaks semantic compatibility with Linux's
hard_start_xmit() method, but means that we don't have to worry so much
about error cases.
Split mechanism of processing received packets (net_rx_process()) out
from policy (net_step()), preparatory to putting net_step() in a separate
object.
2006-04-29 17:17:43 +00:00
23c494d14e
Added basic code for implementing co-operative multitasking.
...
Yes, you really can do it in 65 bytes.
2006-04-29 16:42:09 +00:00
5fe31f1014
Give uIP a static IP address for proof-of-concept testing
2006-04-28 14:15:21 +00:00
129c6c3968
Network layer now works as a proof of concept
2006-04-28 14:13:50 +00:00
1488cd3b73
Fix a couple of broken assertions, and align the buffer correctly.
2006-04-28 14:09:31 +00:00
79f64eea55
Transmit the buffer contents, not the buffer descriptor...
2006-04-28 14:08:41 +00:00
51feeab445
Add an explicit failure debug message
2006-04-28 14:07:41 +00:00
084f6b18f7
Exclude bin directory from tags generation.
...
Create something that might be usable as a symbol list for bochs'
internal debugger.
2006-04-28 14:07:08 +00:00
d8e99bf28f
Gave up on adding POSIX errno's as required, and just added (almost) all
...
of them in one go.
EBADIMG has been replaced by ENOEXEC, and EIMGRET by ECANCELED.
2006-04-28 13:44:34 +00:00
cfae86f6c8
Glenn managed to shrink .text by 5 more bytes.
2006-04-25 21:48:16 +00:00
fee8b91015
D'oh
2006-04-25 12:56:18 +00:00
7a82c3eca3
Added missing ssize_t
2006-04-25 12:55:23 +00:00
cf3783b4ca
Actually, it's probably a good idea to have packet buffers avoid 4kB
...
crossings.
2006-04-25 12:11:36 +00:00
00a1de964d
Update to use POSIX-like API.
2006-04-25 12:04:07 +00:00
face774c4c
Fixed erroneous comparison
2006-04-25 11:54:58 +00:00
95f8a42930
Removed incorrect comment; malloc() is inefficient only when the
...
alignment and size are both powers of two, and there's no way to
specify an alignment through the malloc() interface anyway.
2006-04-25 10:41:49 +00:00
4e92f29c9e
Now passes trivial tests. free_memblock() needs neatening up.
2006-04-25 04:01:58 +00:00
b601a7d355
Updated memory allocator to improve support for unaligned or partially
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aligned blocks.
Moved header to include/malloc.h, since we now also provide the
POSIX-like malloc()/free() pair.
Not yet tested.
2006-04-25 03:30:46 +00:00
2f0d412210
Add __constant_flsl(), because it's useful for finding out the next
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power-of-two up from a given constant via
( 1 << fls ( constant - 1 ) )
fls(), flsl(), ffs() and ffsl() appear in strings.h according to
POSIX.
2006-04-24 23:00:32 +00:00
a81f96998b
Added missing headers required for compilation in Etherboot.
2006-04-24 19:35:10 +00:00
455b76980f
Added pkb_reserve().
2006-04-24 19:34:51 +00:00
26749951dc
We have our own ARP layer now.
2006-04-24 19:19:13 +00:00
fcf765e42d
Add missing {register,free}_netdev().
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Tie into existing driver API; we'll fix that up soon.
2006-04-24 18:44:50 +00:00
832e86246b
gcc is rather over-aggressive about optimising out static data structures
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even when __atribute__ (( unused )) is correctly set...
2006-04-24 18:31:37 +00:00
4c4e4de18f
(librm_base-1b) is already an offset; no need to apply OFFSET().
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Doing so, in fact, seems to expose an assembler bug; (a-b-0) is
apparently not the same as (a-b). Go figure.
2006-04-24 18:29:47 +00:00
Michael Brown
Dan Lynch