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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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329:"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.
236:segment:offset location of the buffer for result.
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343:"INT 15 - newer BIOSes - GET SYSTEM MEMORY MAP"
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176:Count of configured 64K blocks above 16M.
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220:Size of buffer for result (20 bytes).
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168:Configured memory 1M to 16M, in KB.
42:It is the fastest and most flexible
126:BIOS Function: INT 0x15, AX=0xE801:
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160:Count of 64K blocks above 16M.
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228:0x534D4150 (ASCII for 'SMAP')
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376:. You can help Knowledge by
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309:RAMMap by Mark Russinovich
46:organization that uses an
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79:, a memory map refers to
19:Not to be confused with
287:Type of address range.
242:SMAP buffer structure:
77:memory management units
428:Computer science stubs
116:IBM Personal Computer
102:) to actual symbols.
75:implementations and
254:Value description
196:Value description
144:Value description
107:PC BIOS memory map
85:hardware registers
48:associative memory
21:Memory-mapped file
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120:compatibles
81:page tables
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315:References
90:In native
32:memory map
98:(such as
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193:Register
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187:Input:
53:In the
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36:memory
368:This
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374:stub
304:BIOS
251:Size
118:and
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225:EDX
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209:EBX
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