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How used: The operating system shall allocate an SMAP buffer in memory (20 bytes buffer). Then set registers as specified in "Input" table. On first call, EBX should be set to 0. Next step is to call INT 0x15. If no error, the interrupt call returns with CF clear and the buffer filled with data
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BIOSses dated August 23, 1994 or later. The caller sets AX to 0xE801 then executes int 0x15. If some error has happened, the routine returns with CF (Carry Flag) set to 1. If no error, the routine returns with CF clear and the state of registers is described as following:
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representing first region of the memory map. EBX is updated by BIOS so that when the OS calls the routine again, The next region is returned in the buffer. BIOS sets EBX to zero if all done.
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about memory layout. It contains the information regarding the size of total memory, any reserved regions and may also provide other details specific to the architecture.
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programs, a memory map refers to the mapping between loaded executable(or)library files and memory regions. These memory maps are used to resolve
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provides a set of routines that can be used by operating system or applications to get the memory layout. Some of the available routines are:
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This BIOS interrupt call is used to get the memory size for 64MB+ configurations. It is supported by
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is a structure of data (which usually resides in memory itself) that indicates how
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is laid out. The term "memory map" has different meanings in different contexts.
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Extended memory between 1M and 16M, in KB. (Maximum value: 0x3C00 = 15360KB).
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340:"INT 15 - Phoenix BIOS v4.0 - GET MEMORY SIZE FOR >64M CONFIGURATIONS"
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BIOS Function: INT 0x15, AX=0xE820 - GET SYSTEM MEMORY MAP:
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of some computers, a memory map may be passed on from the
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Continuation value or 0x0 to start at beginning of map.
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Base address of memory map region referred to by EBX.
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354:"INT 15 - newer BIOSes - GET SYSTEM MEMORY MAP"
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179:Configured memory 1M to 16M, in KB.
53:It is the fastest and most flexible
137:BIOS Function: INT 0x15, AX=0xE801:
387:. You can help Knowledge (XXG) by
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171:Count of 64K blocks above 16M.
239:0x534D4150 (ASCII for 'SMAP')
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320:RAMMap by Mark Russinovich
57:organization that uses an
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90:, a memory map refers to
30:Not to be confused with
298:Type of address range.
253:SMAP buffer structure:
88:memory management units
439:Computer science stubs
127:IBM Personal Computer
113:) to actual symbols.
86:implementations and
265:Value description
207:Value description
155:Value description
118:PC BIOS memory map
96:hardware registers
59:associative memory
32:Memory-mapped file
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131:compatibles
92:page tables
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326:References
101:In native
43:memory map
109:(such as
309:See also
204:Register
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125:for the
103:debugger
70:firmware
198:Input:
64:In the
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379:This
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55:cache
385:stub
315:BIOS
262:Size
129:and
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41:, a
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228:ECX
220:EBX
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