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91 lines
2.5 KiB
91 lines
2.5 KiB
/*--
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Module Name
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constant.h
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Author
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Thomas Parslow (tomp)
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--*/
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//
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// Debugging Level defines
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//
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#ifdef DEBUG0
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#define DBG0(x) x
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#define DBG1(x)
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#elif defined DEBUG1
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#define DBG0(x) x
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#define DBG1(x) x
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#else
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#define DBG0(x)
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#define DBG1(x)
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#endif
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#define WAITFOREVER while(1);
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#define BUGCHECK while(1);
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#define ENTRIES_PER_PAGETABLE 1024
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#define PAGE_SIZE 0x1000
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#define ENABLING 0
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#define RE_ENABLING 1
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//
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// Define page-table-entry bit definitions
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//
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// Dir Table
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// ----------==========
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// 00000000000000000000xxxxxxxxxxxx
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// ::::::+--- Present = 1 - Not Present = 0
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// :::::+---- ReadWrite = 1 - Read only = 0
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// ::::+----- UserAccess = 1 - Supervisor = 0
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// :::+------ Reserved
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// ::+------- Reserved
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// :+-------- Dirty = 1 - Not written = 0
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// +--------- Accessed = 1 - No accessed = 0
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#define PAGE_SUPERVISOR 0x0000
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#define PAGE_READ_ONLY 0x0000
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#define PAGE_PRESENT 0x0001
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#define PAGE_NOT_PRESENT 0x0000
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#define PAGE_READ_WRITE 0x0002
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#define PAGE_USER_ACCESS 0x0004
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#define PAGE_PERSIST 0x0200 // Tells kernel maintain
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//
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// Define RWSP (Read, Write, Supervisor, Present)
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//
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#define PAGE_RWSP 0L | PAGE_READ_WRITE | PAGE_SUPERVISOR | PAGE_PRESENT
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#define PAGE_ROSP 0L | PAGE_READ_ONLY | PAGE_SUPERVISOR | PAGE_PRESENT
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// Since the entire boot process occurs at ring 0, the only way we can
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// protext areas that we don't want trashed is too mark them not present
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#define PAGE_NO_ACCESS 0L | PAGE_READ_ONLY | PAGE_SUPERVISOR | PAGE_NOT_PRESENT
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//
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// Page-entry macros
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//
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#define PD_Entry(x) (USHORT)((x)>>22) & 0x3ff
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#define PT_Entry(x) (USHORT)((x)>>12) & 0x3ff
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#define PAGE_Count(x) (USHORT)((x)/PAGE_SIZE) + (((x) % PAGE_SIZE) ? 1 : 0)
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#define PhysToSeg(x) (USHORT)((x) >> 4) & 0xffff
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#define PhysToOff(x) (USHORT)((x) & 0x0f)
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#define MAKE_FP(p,a) FP_SEG(p) = (USHORT)((a) >> 4) & 0xffff; FP_OFF(p) = (USHORT)((a) & 0x0f)
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#define MAKE_FLAT_ADDRESS(fp) ( ((ULONG)FP_SEG(fp) * 16 ) + (ULONG)FP_OFF(fp) )
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//
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// Machine type definitions.
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// N.B. All the constants defined here
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// must match the ones defined in ntos\inc\i386.h
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//
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#define MACHINE_TYPE_ISA 0
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#define MACHINE_TYPE_EISA 1
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#define MACHINE_TYPE_MCA 2
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