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Microprocessor Changes

Microprocessor Changes (Windows CE 5.0)

Windows CE 5.0
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When you reference microprocessors in Windows CE .NET 4.0 and later, keep the following changes in mind:

  • Microprocessor-specific defines, such as R4100, R4102, R4111, R4200, R4300, IDT32364, ARM720, and ARM920, should no longer be used outside of the kernel.
  • Although R4100 and IDT32364 are both MIPS II architectures, they are now built on slightly different translation look-aside buffers (TLBs).

    The MIPS II Sysgen variable creates two variants of the kernel Nk.bin file.

  • SHx is now in the SH microprocessor family.

    The DIRS_SHx environment variable is now DIRS_SH. Paths including SHx are now SH.

  • The _SH3_ macro previously applied to SH3 and SH4.

    It has been replaced by _SHX_. The SHx macro is also available.

  • Microprocessor types now represent microprocessor architectures and many environment variables are different. The following table shows the previous microprocessor names and the new names for Wince.bat.
    Previous microprocessor type and nameNew microprocessor name
    MIPS/R4100MIPSII
    MIPS/IDT32364MIPSII
    MIPS/R4300MIPSII_FP
    MIPS/MIPSIVMIPSIV
    MIPS/MIPSIV_FPMIPSIV_FP
    ARM/ARM720, ARM/ARM920, and other ARM variantsARMV4I
    SHx/SH4SH4
    x86/i486x86

The following table shows microprocessor-specific APIs that Windows CE requires. For a comprehensive list of all the required APIs, see the API reference topics.

Microprocessor:
language element
Description
All microprocessors: GetIdleTimeIn Windows CE 3.0 and later, supporting this function requires that you declare and calculate the following variables in the OAL:
// Translation constant in 1 ms units.
extern DWORD idleconv;
// 64-bit idle time in ms.
extern DWORD curridlehigh, curridlelow; 
x86: IOCTL_HAL_REBOOTIn Windows CE .NET 4.1 and later, the x86 microprocessor implementation of IOCTL_HAL_REBOOT is unique because the OS includes conditionally compiled code that offers the following implementations:
  • Sets a global variable flag that is noticed by the OAL ISR. This triggers a re-entry into the Eboot StartUp routine. Eboot still resides in RAM. This is the default implementation.
  • Writes to a hardware register on the x86 motherboard. This is selectable at build time based on a preprocessor flag or by uncommenting the code.

The hardware reset signal is therefore asserted. This is the same as pressing the reset button, which causes the BIOS to run.

x86: OEMFlushCacheIn Windows CE 3.0 and later, the OEMFlushCache function is needed for all x86 target devices. The kernel calls this function when the CacheSync function is called.
SHx: SH4CacheLinesIn Windows CE .NET 4.1 and later, this variable describes the number of cache lines supported by the SH4 microprocessor.
SHx: Nested interruptsIn Windows CE .NET 4.0 and later, in the SHx architecture, the IntrPrio structure provides the kernel with information about which interrupts are masked when the current interrupt is handled.

To gain access to the structure, you must declare the extern BYTE IntrPrio[]; variable in the OAL.

MIPS: Nested interruptsIn Windows CE .NET 4.0 and later, in the MIPS architecture, the kernel uses the IntrPriority and IntrMask structures to provide information about nested interrupts.

The structures provide the kernel with the information about which interrupts are masked when the current interrupt is handled.

ARM: OEMARMCacheModeIn Windows CE .NET 4.0 and later, this function allows you to change the cache bits settings in the page table entries for only the ARM processors. These bits determine cache mode and write buffer use.

The ARM kernels still default to their previous settings but in Windows CE you can change those settings and the ARM microprocessor supports the change.

This function is required in every ARM OAL.

ARM: OEMInterruptHandlerFIQIn Windows CE .NET 4.0 and later, Windows CE enables the routing of the fast Interrupt request (FIQ) OAL. To facilitate the routing, you must implement the OEMInterruptHandlerFIQ function.

This function must be part of the your OAL for any ARM build to succeed, even if it is just a stub.

ARM: OEMInterruptHandlerIn Windows CE .NET 4.0 and later, Windows CE enables nesting support.

The kernel calls the OEMInterruptHandler function when a typical interrupt occurs.

See Also

Migrating a Board Support Package | Debugging and Testing


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