While the BIOS support for INT10h emulation has been set up, any
modification of the display should wait until the kernel requests
video initialization with INBV/bootvid.
The latter will call HalResetDisplay() (that calls HalpBiosDisplayReset())
at the correct time.
This avoids an useless video mode change and reset when booting ReactOS.
- Don't use CONFIG_SMP, this isn't handled in (most of) hal
- Add a dummy HalpSetupProcessorsTable for UP
- Call HalpRegisterKdSupportFunctions only for processor 0
Co-authored-by: Victor Perevertkin <victor.perevertkin@reactos.org>
Introduce the initial changes needed to get other processors up and into kernel mode.
This only supports x86 as of now but is the first real step towards using other system processors.
This will be needed for compatibility with x86 Windows Vista/7 videoprt.sys builds.
Might be also useful in future for platforms (x86 , ...) where V86 mode is not available or buggy.
CORE-11954, CORE-18185
Simplify code, instead of adding 2 missing ObDereferenceObject().
(Note that ObInsertObject() always dereferences the object in case of failure.)
CORE-17904
* Call HalInitializeBios both in phase 0 and 1
* In phase 0 allocate some physical memory, instead of using arbitrary hardcoded pages, that then end up as page tables and get filled with VESA tables
- Change INIT_FUNCTION and INIT_SECTION to CODE_SEG("INIT") and DATA_SEG("INIT") respectively
- Remove INIT_FUNCTION from function prototypes
- Remove alloc_text pragma calls as they are not needed anymore
- Add boot video color constants
- Refactor palette initialization
- Move some common stuff in right place
- Get rid of some magic constants and hardcoded values
- Get rid of TopDelta variable (calculated at compile time)
- Update SAL annotations
Addendum to 5f2ca473. CORE-16216 CORE-16219
CORE-11921 CORE-13715
(Regression introduced by commit 2e1b82cf, r44841.)
In some cases the number of valid (!= 0xFFFF) entries in the IOPM can be
larger than the assumed size (32) of the entries cache. The maximum
possible number of entries is equal to IOPM_SIZE / sizeof(USHORT).
A way to reproduce the problem is as follows: start ReactOS in debugging
mode using '/DEBUG /DEBUGPORT=SCREEN' . Then manage to break into the
debugger exactly during the execution of Ke386CallBios() triggered by
display initialization (for example in my case, while a video driver was
being initialized via the HwInitialize() call done by videoport inside
IntVideoPortDispatchOpen() ).
When this happens, a "concurrent" execution between Ke386CallBios() and
the HAL function HalpStoreAndClearIopm() takes place. This is due to the
fact that when entering the debugger in SCREEN mode, the following
call-chain holds:
InbvResetDisplay() -> VidResetDisplay() -> HalResetDisplay() ->
HalpBiosDisplayReset() -> HalpSetupRealModeIoPermissionsAndTask() ->
HalpStoreAndClearIopm().
However, the code of Ke386CallBios() has reset the IOPM contents with
all zeroes instead of 0xFFFF, and this triggers the caching of all the
entries of the IOPM by HalpStoreAndClearIopm(), whose number is greater
than the wrongly assumed number of '32'.
As Thomas explained to me, "Windows supports [the maximum number of IOPM entries],
it just makes a full copy of the table instead of this indexed partial copy."
And I agree that this overengineered so-called "optimization" committed
in 2e1b82cf contributed in introducing an unnecessary bug and making the
code less clear. Also it makes the IOPM cache larger than the necessary
size by twice as much. Finally, Ke386CallBios() also caches IOPM entries
before doing a 16-bit call, and obviously uses the more straightforward
way of doing a direct copy of the IOPM table (using RtlCopyMemory()).
I wonder what kind of "optimization" this tried to achieve, knowing that
we are not doing like thousands of 32->16bit BIOS interrupt calls per second
in ReactOS...
* Add an NDK header to define INIT_FUNCTION/INIT_SECTION globally
* Use _declspec(allocate(x)) and _declspec(code_seg(x)) on MSVC versions that support it
* Use INIT_FUNCTION on functions only and INIT_SECTION on data only (required by MSVC)
* Place INIT_FUNCTION before the return type (required by MSVC)
* Make sure declarations and implementations share the same modifiers (required by MSVC)
* Add a global linker option to suppress warnings about defined but unused INIT section
* Merge INIT section into .text in freeldr
