207 lines
13 KiB
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207 lines
13 KiB
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<TITLE>Int 15/AX=D042h/BL=01h
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<META NAME="Description" CONTENT="
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Int 15/AX=D042h/BL=01h - Intel Pentium Pro BIOS UPDATE - WRITE BIOS UPDATE AREA -
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AX = D042h
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BL = 01h
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ES:DI - microcode update block (see #00533)
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CX,DX,SI = segments of three 64K scratchpad areas for BIOS use
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Return: CF clear if successful
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CF set on error
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AH = status (see #00532)
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AL = OEM error (if AH is not 00h or 86h, otherwise undefined)
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00h successful
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Notes: a microcode update may also be initiated by a WRMSR instruction
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<h2>Int 15/AX=D042h/BL=01h
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<h3><font color=#C00040>Intel Pentium Pro BIOS UPDATE - WRITE BIOS UPDATE AREA</font></h3>
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<PRE>
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AX = D042h
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BL = 01h
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ES:DI -> microcode update block <a href="rb-1623.htm#Table533" tppabs="http://www.ctyme.com/intr/rb-1623.htm#Table533">(see #00533)</a>
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CX,DX,SI = segments of three 64K scratchpad areas for BIOS use<br>
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<p><b>Return:</b><br>CF clear if successful
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CF set on error
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AH = status <a href="rb-1623.htm#Table532" tppabs="http://www.ctyme.com/intr/rb-1623.htm#Table532">(see #00532)</a>
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AL = OEM error (if AH is not 00h or 86h, otherwise undefined)
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00h successful
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</PRE>
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<p><b>Notes:</b>
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A microcode update may also be initiated by a WRMSR instruction
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with ECX=0079h, EDX=00000000h, and EAX=linear address of update
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block <a href="rb-1623.htm#Table533" tppabs="http://www.ctyme.com/intr/rb-1623.htm#Table533">(see #00533)</a>.
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At least 32K stack space must be available when this function is called
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<p><b>See Also:</b>
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<a href="rb-1622.htm" tppabs="http://www.ctyme.com/intr/rb-1622.htm">AX=D042h/BL=00h</a> - <a href="rb-1624.htm" tppabs="http://www.ctyme.com/intr/rb-1624.htm">AX=D042h/BL=02h</a> - <a href="rb-1625.htm" tppabs="http://www.ctyme.com/intr/rb-1625.htm">AX=D042h/BL=03h</a> - MSR 00000079h
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<PRE>
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<p>
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<a name=table532></a>
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(Table 00532)
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Values for Pentium Pro BIOS update status:
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00h successful
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86h not implemented
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90h unable to erase NVRAM device
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91h unable to write to NVRAM device
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92h unable to read storage
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93h NVRAM is full
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94h specified processor stepping is not present in system
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95h invalid header or loader version
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96h wrong checksum in header
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97h processor rejected the update
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98h the same or a more recent update is already stored
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99h update block number was out of range
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<p>
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Format of Pentium Pro microcode update block:
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<a name=table533></a>
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Offset Size Description (Table 00533)
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00h DWORD update header version number (currently 00000001h)
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FFFFFFFFh = unused block
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04h DWORD revision number of this microcode update
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08h DWORD update creation date, as BCD mmddyyyy (month,day,year)
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0Ch DWORD family/model/stepping of processor to which update applied
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(same value as returned by CPUID instruction)
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10h DWORD checksum (used to force sum of all 512 DWORDs of the update
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block to 00000000h)
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14h DWORD revision number of loader needed to install update
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(currently 00000001h)
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18h 24 BYTEs reserved for future expansion
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30h 2000 BYTEs encrypted microcode data
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</PRE>
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<p><b>See Also:</b>
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MSR 00000079h - <a href="int-15.htm" tppabs="http://www.ctyme.com/intr/int-15.htm">OPCODE </a>"CPUID"
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<p>
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Uncatagorized</a>
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I</a>
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