MZ is back!HEADmain

1 files changed, 571 insertions, 0 deletions

diff --git a/v4.0/src/MEMM/EMM/EMM40.C b/v4.0/src/MEMM/EMM/EMM40.C
new file mode 100644
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--- /dev/null
+++ b/v4.0/src/MEMM/EMM/EMM40.C
@@ -0,0 +1,571 @@
+/*******************************************************************************
+ * 
+ * (C) Copyright Microsoft Corp. 1986
+ * 
+ *    TITLE:    VDMM
+ *
+ *    MODULE:   EMM40.C - EMM 4.0 functions code.
+ *
+ *    VERSION:  0.00
+ *
+ *    DATE:     Feb 25, 1987
+ *
+ *******************************************************************************
+ *      CHANGE LOG
+ *  Date     Version       Description
+ * --------  --------   -------------------------------------------------------
+ * 02/25/87     0.00    Orignal
+ *
+ *******************************************************************************
+ *     FUNCTIONAL DESCRIPTION
+ *
+ * Paged EMM Driver for the iAPX 386.
+ * Extra functions defined in the 4.0 spec required by Windows.
+ * 
+ ******************************************************************************/ 
+
+/******************************************************************************
+        INCLUDE FILES
+ ******************************************************************************/ 
+#include "emm.h"
+/*#include "mem_mgr.h"*/
+
+
+/******************************************************************************
+        EXTERNAL DATA STRUCTURES
+ ******************************************************************************/ 
+/*
+ * handle_table
+ *      This is an array of handle pointers.
+ *      page_index of zero means free
+ */
+extern struct handle_ptr handle_table[];
+extern Handle_Name Handle_Name_Table[];         /* Handle names */
+extern unsigned short   handle_table_size;      /* number of entries */
+extern unsigned short   handle_count;           /* active handle count */
+
+/*
+ * EMM Page table
+ *      this array contains lists of indexes into the 386
+ *      Page Table.  Each list is pointed to by a handle
+ *      table entry and is sequential/contiguous.  This is
+ *      so that maphandlepage doesn't have to scan a list
+ *      for the specified entry.
+ */
+extern unsigned short *emm_page;        /* _emm_page array */
+extern int      free_count;             /* current free count */
+extern int      total_pages;            /* number being managed */
+extern unsigned emmpt_start;            /* next free entry in table */
+
+/*
+ * EMM free table
+ *      this array is a stack of available page table entries. 
+ *      each entry is an index into the pseudo page table
+ */
+/*extern        unsigned free_stack_count;      /* number of entries */
+
+/*
+ * Current status of `HW'. The way this is handled is that
+ * when returning status to caller, normal status is reported 
+ * via EMMstatus being moved into AX. Persistant errors
+ * (such as internal datastructure inconsistancies, etc) are
+ * placed in `EMMstatus' as HW failures. All other errors are 
+ * transient in nature (out of memory, handles, ...) and are 
+ * thus reported by directly setting AX. The EMMstatus variable
+ * is provided for expansion and is not currently being
+ * set to any other value.
+ */
+extern unsigned short EMMstatus;
+
+/*
+ * 4.0 EXTRAS
+ */
+
+extern unsigned short emm40_info[5];            /* hardware information */
+extern struct mappable_page mappable_pages[];   /* mappable segments
+                                                   and corresponding pages */
+extern short    mappable_page_count;            /* number of entries in above */
+extern short    page_frame_pages;               /* pages in the page frame */
+extern short    physical_page_count;            /* number of physical pages */
+/*extern char   VM1_cntxt_pages;                /* pages in a VM1 context */
+/*extern char   VMn_cntxt_pages;                /* pages in a VM context */
+/*extern char   VM1_cntxt_bytes;                /* bytes in a VM1 context */
+/*extern char   VMn_cntxt_bytes;                /* bytes in a VM context */
+extern char cntxt_pages;                /* pages in context */
+extern char cntxt_bytes;                /* bytes in context */
+extern unsigned short PF_Base;
+extern unsigned short VM1_EMM_Pages;
+/*extern unsigned short VM1_EMM_Offset;*/
+extern long     page_frame_base[];
+extern char     EMM_MPindex[];
+extern long     OSEnabled;                      /* OS/E function flag */
+extern long     OSKey;                          /* Key for OS/E function */
+
+/******************************************************************************
+        EXTERNAL FUNCTIONS
+ ******************************************************************************/ 
+extern  struct handle_ptr       *valid_handle();        /* validate handle */
+extern  unsigned far    *source_addr();                 /* get DS:SI far ptr */
+extern  unsigned far    *dest_addr();                   /* get ES:DI far ptr */
+extern  unsigned        wcopyb();
+extern  unsigned        copyout();
+extern  unsigned short  Avail_Pages();
+
+
+/******************************************************************************
+        ROUTINES
+ ******************************************************************************/ 
+
+/*
+ * Reallocate Pages
+ *      parameters:
+ *              bx    -- new number of pages
+ *              dx    -- handle
+ *      returns:
+ *              bx    -- new number of pages
+ *
+ * Change the number of pages allocated to a handle.
+ *
+ * ISP 5/23/88 Updated for MEMM
+ */
+ReallocatePages() 
+{
+#define handle  ((unsigned short)regp->hregs.x.rdx)
+
+        register struct handle_ptr      *hp;
+        struct handle_ptr               *hp_save;
+        unsigned                        new_size;
+        register unsigned               n_pages;
+        register unsigned               next;
+
+        if ( (hp = valid_handle(handle)) == NULL_HANDLE )
+                return;         /* (error code already set) */
+
+        setAH((unsigned char)EMMstatus);        /* Assume success */
+        new_size = regp->hregs.x.rbx;
+        if ( new_size == hp->page_count )
+                return;                         /* do nothing... */
+
+        if ( new_size > hp->page_count ) {
+                if ( new_size > total_pages ) {
+                        setAH(NOT_ENOUGH_EXT_MEM);
+                        return;
+                }
+                n_pages = new_size - hp->page_count;
+                if ( n_pages > Avail_Pages() ) {
+                        setAH(NOT_ENOUGH_FREE_MEM);
+                        return;
+                }
+                if ( hp->page_count == 0 )
+                        next = hp->page_index = emmpt_start;
+                else
+                        next = hp->page_index + hp->page_count;
+                hp->page_count = new_size;
+                if ( next != emmpt_start ) {
+                                /*
+                                 * Must shuffle emm_page array to make room
+                                 * for the extra pages.  wcopyb correctly
+                                 * handles this case where the destination
+                                 * overlaps the source.
+                                 */
+                        wcopyb(emm_page+next, emm_page+next+n_pages,
+                               emmpt_start - next);
+                        /* Now tell other handles where their pages went */
+                        hp_save = hp;
+                        for ( hp = handle_table;
+                              hp < &handle_table[handle_table_size]; hp++ )
+                                if ( hp->page_index != NULL_PAGE &&
+                                     hp->page_index >= next )
+                                        hp->page_index += n_pages;
+                        hp = hp_save;
+                }
+                emmpt_start += n_pages;
+                if ( get_pages(n_pages, next) == NULL_PAGE) { /* strange failure */
+                        setAH(NOT_ENOUGH_FREE_MEM);
+                        new_size = hp->page_count - n_pages;  /* as it was! */
+                        setBX(new_size);
+                        goto shrink;                    /* and undo damage */
+                }
+        } else {
+                /* Shrinking - make handle point to unwanted pages */
+        shrink:
+                hp->page_count -= new_size;
+                hp->page_index += new_size;
+                free_pages(hp);    /* free space in emm_page array */
+                /* Undo damage to handle, the index was not changed */
+                hp->page_count = new_size;
+                hp->page_index -= new_size;
+        }
+
+#undef  handle
+}
+
+/*
+ * UndefinedFunction
+ *
+ * An undefined or unsupported function.
+ *
+ * 05/10/88  ISP  No update needed
+ */
+UndefinedFunction() 
+{
+        setAH(INVALID_FUNCTION);
+}
+
+/*
+ * Get Mappable Physical Address Array
+ *      parameters:
+ *              al == 0
+ *              es:di -- destination
+ *      returns:
+ *              cx    -- number of mappable pages
+ *
+ *      parameters:
+ *              al == 1
+ *      returns:
+ *              cx    -- number of mappable pages
+ * 
+ * Get the number of mappable pages and the segment address for each
+ * physical page.
+ *
+ * ISP  5/23/88 Updated for MEMM.  u_ptr made into a far pointer.
+ */
+GetMappablePAddrArray() 
+{
+        unsigned far *u_ptr;
+        int     n_pages;
+        int     i;
+        struct mappable_page *mp = mappable_pages;
+
+                n_pages = mappable_page_count;
+
+        if ( regp->hregs.h.ral == 0 ) {
+                if ( n_pages > 0 ) {
+                        u_ptr = dest_addr();            /* ES:DI */
+                        for (i=0 ; i < 48 ; i++)
+                                if (EMM_MPindex[i] != -1)
+                                        copyout(((struct mappable_page far *)u_ptr)++,
+                                                mp + EMM_MPindex[i],
+                                                sizeof(struct mappable_page) );
+                }
+        } else if ( regp->hregs.h.ral != 1 ) {
+                setAH(INVALID_SUBFUNCTION);
+                return;
+        }
+        setCX(n_pages);
+        setAH((unsigned char)EMMstatus);
+}
+
+/*
+ * Get Expanded Memory Hardware Information
+ *      parameters:
+ *              al == 0
+ *              es:di -- user array
+ *      returns:
+ *              es:di[0] = raw page size in paragraphs
+ *              es:di[2] = number of EXTRA fast register sets
+ *              es:di[4] = number of bytes needed to save a context 
+ *              es:di[6] = number of settable DMA channels
+ *
+ *      parameters:
+ *              al == 1
+ *      returns:
+ *              bx = number of free raw pages
+ *              dx = total number of raw pages
+ *              
+ * ISP  5/23/88 Updated for MEMM. Made u_ptr into far ptr.
+ */
+GetInformation() 
+{
+        unsigned far *u_ptr;
+        unsigned pages;
+
+        if ( OSEnabled >= OS_DISABLED ) {
+                setAH(ACCESS_DENIED);           /* Denied by operating system */
+                return;
+        }
+
+        if ( regp->hregs.h.ral == 0 ) {
+                u_ptr = dest_addr();            /* ES:DI */
+                emm40_info[2] = (short)cntxt_bytes;     /* update size */
+                copyout(u_ptr, emm40_info, sizeof(emm40_info));
+                setAH((unsigned char)EMMstatus);
+        } else if ( regp->hregs.h.ral == 1 ) {
+                GetUnallocatedPageCount();      /* Use existing code */
+        } else
+                setAH(INVALID_SUBFUNCTION);
+}
+
+/*
+ * GetSetHandleAttribute
+ *
+ *      parameters:
+ *              al == 0
+ *      returns:
+ *              al == 0 -- volatile handles
+ *
+ *      parameters:
+ *              al == 1
+ *      returns:
+ *              ah = 91h -- Feature not supported
+ *
+ *      parameters:
+ *              al == 2
+ *      returns:
+ *              al == 0 -- Supports ONLY volatile handles
+ *
+ * 05/09/88 ISP No update needed
+ */
+GetSetHandleAttribute()
+{
+#define handle  ((unsigned short)regp->hregs.x.rdx)
+
+        if ( regp->hregs.h.ral == 0 ) {
+                if (valid_handle(handle) == NULL_HANDLE)
+                        return;                                         /* (error code already set) */
+                setAX(EMMstatus << 8);          /* AL = 0 [volatile attribute] */
+        } else if ( regp->hregs.h.ral == 1 ) {
+                setAH(FEATURE_NOT_SUPPORTED);
+        } else if ( regp->hregs.h.ral == 2 ) {
+                setAX(EMMstatus << 8);          /* AL = 0 [volatile attribute] */
+        } else
+                setAH(INVALID_SUBFUNCTION);
+
+#undef  handle
+}
+
+
+
+
+/*
+ * GetSetHandleName
+ *
+ *  Subfunction 0 Gets the name of a given handle
+ *  Subfunction 1 Sets a new name for handle
+ *
+ *      parameters:
+ *              al == 0
+ *              es:di == Data area to copy handle name to
+ *              dx    -- handle
+ *      returns:
+ *              [es:di] == Name of DX handle
+ *
+ *      parameters:
+ *              al == 1
+ *              ds:si == new handle name
+ *              dx    -- handle
+ *      returns:
+ *              ah = Status
+ *
+ * ISP 5/23/88 Updated for MEMM. Name made into far *. Copyin routine used
+ *             to copy name in into handle name table.
+ */
+GetSetHandleName()
+{
+        register unsigned short handle = ((unsigned short)regp->hregs.x.rdx);
+        register char far *Name;
+
+    /* Validate subfunction */
+        if ( (regp->hregs.h.ral != 0) && (regp->hregs.h.ral != 1) ) {
+                setAH(INVALID_SUBFUNCTION);
+                return;
+        }
+
+    /* Validate handle */
+
+        if ( valid_handle(handle) == NULL_HANDLE )
+                return;         /* (error code already set) */
+
+    /* Implement subfunctions 0 and 1 */
+        if ( regp->hregs.h.ral == 0 ) {
+                Name = (char far *)dest_addr();            /* ES:DI */
+                copyout(Name, Handle_Name_Table[handle & 0xFF], Handle_Name_Len);
+                setAH((unsigned char)EMMstatus);
+        } else if ( regp->hregs.h.ral == 1 ) {
+                GetHandleDirectory();           /* See if already there */
+                switch ( regp->hregs.h.rah ) {
+                case NAMED_HANDLE_NOT_FOUND:
+                        break;
+                case DUPLICATE_HANDLE_NAMES:
+                        return;
+                default:
+                        if ( handle == regp->hregs.x.rdx )
+                                break;          /* same handle, OK */
+                        regp->hregs.x.rdx = handle;
+                        setAH(DUPLICATE_HANDLE_NAMES);
+                        return;
+                }
+                Name = (char far *)source_addr();
+                copyin(Handle_Name_Table[handle & 0xFF], Name, Handle_Name_Len);
+                setAH((unsigned char)EMMstatus);
+        } else
+                setAH(INVALID_SUBFUNCTION);
+
+}
+
+
+
+
+/*
+ * GetHandleDirectory
+ *
+ *  Subfunction 0 Returns a directory of handles and handle names
+ *  Subfunction 1 Returns the handle specified by the name at [ds:si]
+ *
+ *      parameters:
+ *              al == 0
+ *              es:di == Data area to copy handle name to
+ *      returns:
+ *              al == Number of entries in the handle_dir array
+ *              [es:di] == Handle_Dir array
+ *
+ *      parameters:
+ *              al == 1
+ *              [ds:si] == Handle name to locate
+ *      returns:
+ *              ah == Status
+ *
+ *      parameters:
+ *              al == 2
+ *      returns:
+ *              bx == Total handles in system
+ *
+ * ISP 5/23/88 Updated for MEMM.  nameaddress and dir_entry made into far *
+ *             copyin routine used to copy name into local area for search.
+ */
+GetHandleDirectory()
+{
+        char far                        *NameAddress;
+        register struct handle_ptr      *hp;
+        struct Handle_Dir_Entry far     *Dir_Entry;
+        unsigned short                  Handle_Num, Found;
+/*
+ * since all local variables are allocated on stack (SS seg)
+ * and DS and SS has grown apart (ie DS != SS),
+ * we need variables in DS seg (ie static variables) to pass
+ * to copyout(),copyin() and Names_Match() which expects those
+ * parameters that are near pointers to be in DS
+ *
+ * PC 08/03/88
+ */
+        static Handle_Name                      Name;
+        static unsigned short           Real_Handle;
+
+        if ( regp->hregs.h.ral == 0 ) {
+                Dir_Entry = (struct Handle_Dir_Entry far *)dest_addr();
+                hp = handle_table;
+                for (Handle_Num = 0; Handle_Num < handle_table_size; Handle_Num++) {
+                    if ( hp->page_index != NULL_PAGE) {
+                        Real_Handle =  Handle_Num;
+                        copyout(Dir_Entry, &Real_Handle, sizeof(short));
+                        copyout(Dir_Entry->Dir_Handle_Name, Handle_Name_Table[Handle_Num], Handle_Name_Len);
+                        Dir_Entry++;
+                    } hp++;
+                } setAX((EMMstatus << 8) + handle_count);
+        } else if ( regp->hregs.h.ral == 1 ) {
+                NameAddress = (char far *)source_addr();
+                copyin(Name, NameAddress, Handle_Name_Len);
+                hp = handle_table;
+                Found = 0;
+                Handle_Num = 0;
+                while ((Handle_Num < handle_table_size) && (Found < 2)) {
+                    if ( hp->page_index != NULL_PAGE ) {
+                        if (Names_Match(Name, Handle_Name_Table[Handle_Num])) {
+                            Found++;
+                            Real_Handle = Handle_Num;
+                        }
+                    } hp++;
+                    Handle_Num++;
+                }
+                switch (Found) {
+                    case 0:
+                        setAH((unsigned char)NAMED_HANDLE_NOT_FOUND);
+                        break;
+                    case 1:
+                        setDX(Real_Handle);
+                        setAH((unsigned char)EMMstatus);
+                        break;
+                    default:
+                        setAH((unsigned char)DUPLICATE_HANDLE_NAMES);
+                }
+
+        } else if ( regp->hregs.h.ral == 2 ) {
+                setBX(handle_table_size);
+                setAH((unsigned char)EMMstatus);
+        } else
+                setAH(INVALID_SUBFUNCTION);
+
+#undef  handle
+}
+
+/*
+ * Prepare For Warm Boot
+ *
+ *      Always ready to reboot the system so just return status = OK
+ *
+ *      parameters:
+ *              None
+ *      returns:
+ *              AH = EMMstatus
+ *
+ * 05/09/88 ISP No update needed.
+ *
+ */
+PrepareForWarmBoot()
+{
+        setAH((unsigned char)EMMstatus);
+}
+
+/*
+ * Enable/Disable OS/E Function Set Functions
+ *
+ *      Enable/Disable access to functions 26, 28 and 30
+ *
+ *      parameters:
+ *              AL = 0          Enable Functions
+ *              AL = 1          Disable Functions
+ *              AL = 2          Return Access Key
+ *              BX, CX          Access Key
+ *      returns:
+ *              AH = EMMstatus
+ *              BX, CX          Access Key if successful
+ *
+ * 05/09/88 ISP Updated for MEMM. Removed check for pCurVMID
+ *
+ */
+OSDisable()
+{
+        unsigned char function = regp->hregs.h.ral;
+
+        if ( function > 2 ) {
+                setAH(INVALID_SUBFUNCTION);
+                return;
+        }
+
+        if ( OSEnabled == OS_IDLE ) {           /* First invocation */
+                if ( function == 2 ) {
+                        setAH(ACCESS_DENIED);
+                        return;
+                }
+                OSKey = Get_Key_Val();          /* Suitably random number */
+                regp->hregs.x.rbx = (short)OSKey;
+                regp->hregs.x.rcx = (short)(OSKey >> 16);
+        } else {                                /* Check Key */
+                if ( (short)OSKey != regp->hregs.x.rbx
+                     || (short)(OSKey >> 16) != regp->hregs.x.rcx ) {
+                        setAH(ACCESS_DENIED);
+                        return;
+                }
+        }
+        if ( function == 0 )                    /* enable */
+                OSEnabled = 1;
+        else if ( function == 1 )               /* disable */
+                OSEnabled = 2;
+        else if ( function == 2 )               /* return key */
+                OSEnabled = 0;
+
+        setAH((unsigned char)EMMstatus);
+}
+
+
+
\ No newline at end of file