83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
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//
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// The following memory address definitions apply to
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// indentity mapped objects for the x86 environment.
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//
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#define RM_PROTECT_BASE_VA 0x000000
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#define RM_PROTECT_BASE_PA 0x000000
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#define RM_PROTECT_SIZE 0x001000
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#define RM_PROTECT_ATTRIBUTES PAGE_ROSP
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#define BPB_BASE_VA 0x007000
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#define BPB_BASE_PA 0x007000
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#define BPB_SIZE 0x001000
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#define BPB_ATTRIBUTES PAGE_ROSP
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#define SU_MODULE_BASE_VA 0x020000
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#define SU_MODULE_BASE_PA 0x020000
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#define SU_MODULE_SIZE 0x020000
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#define SU_MODULE_ATTRIBUTES PAGE_RWSP
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#define LOADER_BASE_VA 0x040000
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#define LOADER_BASE_PA 0x040000
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#define LOADER_SIZE 0x020000
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#define LOADER_ATTRIBUTES PAGE_RWSP
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#define SYSTEM_STRUCTS_BASE_VA 0x80420000
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#define SYSTEM_STRUCTS_BASE_PA 0x00017000
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#define SYSTEM_STRUCTS_SIZE 0x002000
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#define SYSTEM_STRUCTS_ATTRIBUTES PAGE_RWSP + PAGE_PERSIST
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#define PAGE_TABLE_AREA_BASE_VA 0x00099000
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#define PAGE_TABLE_AREA_BASE_PA 0x00099000
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#define PAGE_TABLE_AREA_SIZE 0x002000
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#define PAGE_TABLE_AREA_ATTRIBUTES PAGE_RWSP + PAGE_PERSIST
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#define LDR_STACK_BASE_VA 0x09b000
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#define LDR_STACK_BASE_PA 0x09b000
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#define LDR_STACK_SIZE 0x001000
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#define LDR_STACK_ATTRIBUTES PAGE_RWSP
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#define LDR_STACK_POINTER 0x09bffe // in su.inc also
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#define VIDEO_BUFFER_BASE_VA 0x0B8000
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#define VIDEO_BUFFER_BASE_PA 0x0B8000
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#define VIDEO_BUFFER_SIZE 0x004000
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#define VIDEO_BUFFER_ATTRIBUTES PAGE_RWSP
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#define HYPER_PAGE_DIRECTORY 0xC0300C00
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#define HYPER_SPACE_BEGIN 0xC0000000 // points to 1st page table
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#define HYPER_SPACE_SIZE 0x8000L
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#define HYPER_SPACE_ENTRY 768
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#define PAGE_TABLE1_ADDRESS 0xC0000000L
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#define PD_PHYSICAL_ADDRESS PAGE_TABLE_AREA_BASE_PA // in su.inc also.
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#define PT_PHYSICAL_ADDRESS PAGE_TABLE_AREA_BASE_PA + PAGE_SIZE
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#define VIDEO_ENTRY 0xB8
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/*
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Switching to Realmode
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~~~~~~~~~~~~~~~~~~~~~
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When switching to realmode "sp" will be initialized to
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0xfffe and (ss) will be set to the base of the SU module's
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data segment. This has several effects.
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1) The stack will remain withing the 0x20000 - 0x3ffff range
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reserved for the original SU module and loader image prior to
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relocation, and since the loader will already have been relocated
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it is no longer necessary to preserve this area.
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2) This will preserve the SU module's small model character which
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requires that offsets can be used interchangably through (ss) or (ds).
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3) This allows for the maximum stack size for small model apps (which is
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what the SU module is). Bios calls should not be tromping on any
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data or code while in realmode.
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*/
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