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+/*++
+
+Copyright (c) 1994 Digital Equipment Corporation
+
+Module Name:
+
+ ciaaddr.c
+
+Abstract:
+
+ This module contains the platform dependent code to create bus addreses
+ and QVAs for the Alcor system.
+
+Author:
+
+ Joe Notarangelo 30-Jun-1994
+ Steve Brooks 30-Jun-1994
+
+Environment:
+
+ Kernel mode
+
+Revision History:
+
+--*/
+
+#include "halp.h"
+#include "eisa.h"
+
+
+typedef PVOID QUASI_VIRTUAL_ADDRESS;
+
+QUASI_VIRTUAL_ADDRESS
+HalCreateQva(
+ IN PHYSICAL_ADDRESS PA,
+ IN PVOID VA
+ );
+
+
+BOOLEAN
+HalpTranslateSystemBusAddress(
+ IN PBUS_HANDLER BusHandler,
+ IN PBUS_HANDLER RootHandler,
+ IN PHYSICAL_ADDRESS BusAddress,
+ IN OUT PULONG AddressSpace,
+ OUT PPHYSICAL_ADDRESS TranslatedAddress
+ )
+
+/*++
+
+Routine Description:
+
+ This function returns the system physical address for a specified I/O bus
+ address. The return value is suitable for use in a subsequent call to
+ MmMapIoSpace.
+
+Arguments:
+
+ BusHandler - Registered BUSHANDLER for the target configuration space
+ Supplies the bus handler (bus no, interface type).
+
+ RootHandler - Registered BUSHANDLER for the orginating
+ HalTranslateBusAddress request.
+
+ BusAddress - Supplies the bus relative address.
+
+ AddressSpace - Supplies the address space number for the device: 0 for
+ memory and 1 for I/O space. If the desired access mode is user mode,
+ then bit 1 must be TRUE.
+
+ TranslatedAddress - Supplies a pointer to return the translated address
+
+
+Notes:
+
+ This is a variation of what began in the MIPS code. The intel code often
+ assumes that if an address is in I/O space, the bottom 32 bits of the
+ physical address can be used "like" a virtual address, and are returned
+ to the user. This doesn't work on MIPs machines where physical
+ addresses can be larger than 32 bits.
+
+ Since we are using superpage addresses for I/O on Alpha, we can do
+ almost what is done on intel. If AddressSpace is equal to 0 or 1, then
+ we assume the user is doing kernel I/O and we call HalCreateQva to
+ build a Quasi Virtual Address and return that to the caller. We then
+ set AddressSpace to a 1, so that the caller will not call MmMapIoSpace.
+ The Caller will use the low 32 bits of the physical address we return
+ as the VA. (Which we built a QVA in).
+
+ If the caller wants to access EISA I/O or Memory through user mode, then
+ the caller must set bit 1 in AddressSpace to a 1 (AddressSpace=2 or 3,
+ depending on whether EISA I/O or Memory), then the caller is returned the
+ 34 bit Physical address. The caller will then call MmMapIoSpace, or
+ ZwMapViewOfSection which in turn calls HalCreateQva to build a QVA out
+ of a VA mapped through the page tables.
+
+ **** Note ****
+
+ The QVA in user mode can only be used via the user-mode access macros.
+
+
+
+Return Value:
+
+ A return value of TRUE indicates that a system physical address
+ corresponding to the supplied bus relative address and bus address
+ number has been returned in TranslatedAddress.
+
+ A return value of FALSE occurs if the translation for the address was
+ not possible
+
+--*/
+
+{
+ INTERFACE_TYPE InterfaceType = BusHandler->InterfaceType;
+ ULONG BusNumber = BusHandler->BusNumber;
+
+ PVOID va = 0; // note, this is used for a placeholder
+
+ //
+ // The buses available on Alcor are EISA and PCI.
+ // We support any translations for ISA devices as well,
+ // since they can plug into EISA slots just fine.
+ //
+
+ if (InterfaceType != Isa &&
+ InterfaceType != Eisa &&
+ InterfaceType != PCIBus) {
+
+ //
+ // Not on this system; return nothing.
+ //
+
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+
+ }
+
+ //
+ // Determine the address based on whether the bus address is in I/O space
+ // or bus memory space.
+ //
+
+ switch ( (ADDRESS_SPACE_TYPE)(*AddressSpace) ) {
+
+ case BusMemory:
+
+ //
+ // The address is in PCI memory space, kernel mode.
+ //
+
+ switch( InterfaceType ) {
+
+ case Isa:
+
+ //
+ // Can't go above 16MB (24 Bits) for Isa Buses
+ //
+
+ if( BusAddress.LowPart >= __16MB ){
+
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+
+ }
+
+ break;
+
+ case PCIBus: {
+
+ if ( BusAddress.LowPart > PCI_MAX_DENSE_MEMORY_ADDRESS ) {
+
+ //
+ // Unsupported dense PCI bus address.
+ //
+#if HALDBG
+ DbgPrint ("Unsupported PCI address %x:%x\n",
+ BusAddress.HighPart,
+ BusAddress.LowPart);
+#endif
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+ }
+ else if( BusAddress.LowPart >= PCI_MIN_DENSE_MEMORY_ADDRESS &&
+ BusAddress.LowPart <= PCI_MAX_DENSE_MEMORY_ADDRESS ) {
+
+#if HALDBG
+ DbgPrint ("Translating PCI kernel dense address %x:%x\n",
+ BusAddress.HighPart,
+ BusAddress.LowPart);
+#endif
+ //
+ // Bus Address is in dense PCI memory space
+ //
+
+ //
+ // QVA, as such, is simply the PCI bus address
+ //
+
+ TranslatedAddress->LowPart = BusAddress.LowPart;
+
+ //
+ // clear high longword for QVA
+ //
+
+ TranslatedAddress->HighPart = 0;
+
+ //
+ // dont let the user call MmMapIoSpace
+ //
+
+ *AddressSpace = 1;
+
+ return (TRUE);
+
+
+ }
+
+ //
+ // Bus Address is in sparse PCI memory space
+ //
+
+
+#if HALDBG
+ DbgPrint ("Translating PCI kernel sparse address %x:%x\n",
+ BusAddress.HighPart,
+ BusAddress.LowPart);
+#endif
+
+ break;
+ } // case PCIBus
+
+ case Eisa:
+
+ break;
+
+ } // switch( InterfaceType )
+
+ //
+ // Start with the base physical address and add the
+ // bus address by converting it to the physical address.
+ //
+
+ TranslatedAddress->QuadPart = CIA_PCI_SPARSE_MEMORY_PHYSICAL;
+ TranslatedAddress->QuadPart +=
+ ((ULONGLONG)BusAddress.LowPart << IO_BIT_SHIFT);
+
+ //
+ // Now call HalCreateQva. This will create a QVA
+ // that we'll return to the caller. Then we will implicitly set
+ // AddressSpace to a 1. The caller then will not call MmMapIoSpace
+ // and will use the address we return as a VA.
+ //
+
+ TranslatedAddress->LowPart = (ULONG)HalCreateQva(
+ *TranslatedAddress,
+ va);
+ TranslatedAddress->HighPart = 0; // clear high longword for QVA
+
+ *AddressSpace = 1; // don't let the user call
+ // MmMapIoSpace
+ return(TRUE);
+
+ case BusIo:
+
+ //
+ // The address is in PCI I/O space, kernel mode.
+ //
+
+ switch( InterfaceType ) {
+
+ case Isa:
+
+ //
+ // Can't go above 64KB (16 Bits) for Isa Buses
+ //
+
+ if( BusAddress.LowPart >= __64K ){
+
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+
+ }
+
+ break;
+
+ case PCIBus:
+
+ //
+ // PCI IO space is always below 64MB (26 Bits) BusAddress
+ // If the address cannot be mapped, just return FALSE.
+ //
+
+ if( BusAddress.LowPart >= __64MB ){
+
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+
+ }
+
+ break;
+
+ case Eisa:
+
+ break;
+
+ } // switch( InterfaceType )
+
+ //
+ // Start with the base physical address and add the
+ // bus address by converting it to the physical address.
+ //
+
+ TranslatedAddress->QuadPart = CIA_PCI_SPARSE_IO_PHYSICAL;
+ TranslatedAddress->QuadPart +=
+ ((ULONGLONG)BusAddress.LowPart << IO_BIT_SHIFT);
+
+ //
+ // Now call HalCreateQva. This will create a QVA
+ // that we'll return to the caller. Then we will implicitly set
+ // AddressSpace to a 1. The caller then will not call MmMapIoSpace
+ // and will use the address we return as a VA.
+
+ TranslatedAddress->LowPart = (ULONG)HalCreateQva(
+ *TranslatedAddress,
+ va);
+ TranslatedAddress->HighPart = 0; // clear high longword for QVA
+
+ *AddressSpace = 1; // make sure user doesn't call
+ // MmMapIoSpace.
+ return(TRUE);
+
+ case UserBusMemory:
+
+ //
+ // The address is in PCI memory space, user mode.
+ //
+
+ //
+ // Start with the base physical address and add the
+ // bus address by converting it to the physical address.
+ //
+
+
+ TranslatedAddress->QuadPart = CIA_PCI_SPARSE_MEMORY_PHYSICAL;
+ TranslatedAddress->QuadPart |= EV5_USER_IO_ADDRESS_SPACE;
+ TranslatedAddress->QuadPart += (BusAddress.LowPart << IO_BIT_SHIFT);
+
+ *AddressSpace = 0; // Let the user call MmMapIoSpace
+
+ return(TRUE);
+
+ case UserBusIo:
+
+ //
+ // The address is in PCI I/O space, user mode.
+ //
+
+ //
+ // Start with the base physical address and add the
+ // bus address by converting it to the physical address.
+ //
+
+ TranslatedAddress->QuadPart = CIA_PCI_SPARSE_IO_PHYSICAL;
+ TranslatedAddress->QuadPart |= EV5_USER_IO_ADDRESS_SPACE;
+ TranslatedAddress->QuadPart += (BusAddress.LowPart << IO_BIT_SHIFT);
+
+ *AddressSpace = 0; // Let the user call MmMapIoSpace
+
+ return(TRUE);
+
+ case KernelPciDenseMemory:
+ case UserPciDenseMemory:
+
+ //
+ // The address is in PCI memory space, user mode.
+ //
+
+ //
+ // Start with the base physical address and add the
+ // bus address by converting it to the physical address.
+ //
+
+ TranslatedAddress->QuadPart = CIA_PCI_DENSE_MEMORY_PHYSICAL;
+ TranslatedAddress->QuadPart |= EV5_USER_IO_ADDRESS_SPACE;
+ TranslatedAddress->QuadPart += BusAddress.LowPart;
+
+ *AddressSpace = 0; // Let the user call MmMapIoSpace
+
+ return(TRUE);
+
+ default:
+
+ //
+ // Unsupported address space.
+ //
+
+ *AddressSpace = 0;
+ TranslatedAddress->LowPart = 0;
+ return(FALSE);
+
+ }
+}
+
+PVOID
+HalCreateQva(
+ IN PHYSICAL_ADDRESS PA,
+ IN PVOID VA
+ )
+
+/*++
+
+Routine Description:
+
+ This function is called two ways. First, from HalTranslateBusAddress,
+ if the caller is going to run in kernel mode and use superpages.
+ The second way is if the user is going to access in user mode.
+ MmMapIoSpace or ZwViewMapOfSection will call this.
+
+ If the input parameter VA is zero, then we assume super page and build
+ a QUASI virtual address that is only usable by calling the hal I/O
+ access routines.
+
+ if the input parameter VA is non-zero, we assume the user has either
+ called MmMapIoSpace or ZwMapViewOfSection and will use the user mode
+ access macros.
+
+ If the PA is not a sparse I/O space address (PCI I/O, PCI Memory),
+ then return the VA as the QVA.
+
+Arguments:
+
+ PA - the physical address generated by HalTranslateBusAddress
+
+ VA - the virtual address returned by MmMapIoSpace
+
+Return Value:
+
+ The returned value is a quasi virtual address in that it can be
+ added to and subtracted from, but it cannot be used to access the
+ bus directly. The top bits are set so that we can trap invalid
+ accesses in the memory management subsystem. All access should be
+ done through the Hal Access Routines in *ioacc.s if it was a superpage
+ kernel mode access. If it is usermode, then the user mode access
+ macros must be used.
+
+--*/
+{
+
+ PHYSICAL_ADDRESS PhysicalOffset;
+ PVOID qva;
+
+ if( (PA.QuadPart >= CIA_PCI_DENSE_MEMORY_PHYSICAL) &&
+ (PA.QuadPart <= (CIA_PCI_DENSE_MEMORY_PHYSICAL +
+ PCI_MAX_DENSE_MEMORY_ADDRESS)) ){
+
+ //
+ // Kernel-mode physical dense address, return VA.
+ //
+
+ return(VA);
+
+ } else if( (PA.QuadPart >=
+ (CIA_PCI_DENSE_MEMORY_PHYSICAL | EV5_USER_IO_ADDRESS_SPACE) ) &&
+ (PA.QuadPart <
+ (CIA_PCI_DENSE_MEMORY_PHYSICAL | EV5_USER_IO_ADDRESS_SPACE +
+ PCI_MAX_DENSE_MEMORY_ADDRESS) ) ){
+
+ //
+ // User-mode physical dense address, return VA.
+ //
+
+ return(VA);
+
+ } else {
+
+ //
+ // The physical address is within one of the sparse I/O spaces.
+ //
+
+ if (VA == 0) {
+
+ PhysicalOffset.QuadPart = PA.QuadPart - CIA_QVA_PHYSICAL_BASE;
+ qva = (PVOID)(PhysicalOffset.QuadPart >> IO_BIT_SHIFT);
+ } else {
+
+ qva = (PVOID)((ULONG)VA >> IO_BIT_SHIFT);
+ }
+
+ qva = (PVOID)((ULONG)qva | QVA_ENABLE);
+
+ return(qva);
+ }
+
+
+}
+
+
+PVOID
+HalDereferenceQva(
+ PVOID Qva,
+ INTERFACE_TYPE InterfaceType,
+ ULONG BusNumber
+ )
+/*++
+
+Routine Description:
+
+ This function performs the inverse of the HalCreateQva for I/O addresses
+ that are memory-mapped (i.e. the quasi-virtual address was created from
+ a virtual address rather than a physical address).
+
+Arguments:
+
+ Qva - Supplies the quasi-virtual address to be converted back to a
+ virtual address.
+
+ InterfaceType - Supplies the interface type of the bus to which the
+ Qva pertains.
+
+ BusNumber - Supplies the bus number of the bus to which the Qva pertains.
+
+Return Value:
+
+ The Virtual Address from which the quasi-address was originally created
+ is returned.
+
+--*/
+{
+
+ //
+ // For Alcor we support three bus types:
+ //
+ // Isa
+ // Eisa
+ // PCIBus
+ //
+
+ switch (InterfaceType ){
+
+ case Isa:
+ case Eisa:
+ case PCIBus:
+
+ //
+ // Support PCI Dense space: check to see if it's really
+ // a QVA.
+ //
+
+ if ( ((ULONG) Qva & QVA_SELECTORS) == QVA_ENABLE ) {
+ return( (PVOID)( (ULONG)Qva << IO_BIT_SHIFT ) );
+ } else {
+ return (Qva);
+ }
+
+ break;
+
+ default:
+
+ return NULL;
+ }
+}
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