BIOS
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'''BIOS''' (Basic Input Output System), is a [[Read Only Memory|ROM]] chip containing code (firmware) to control peripherals attached to a [[wikipedia:PC]]. | '''BIOS''' (Basic Input Output System), is a [[Read Only Memory|ROM]] chip containing code (firmware) to control peripherals attached to a [[wikipedia:PC]]. | ||
| − | The x86 BIOS entry point is located at physical address <code>0xfffffff0</code> (usually corresponding to 16 bytes from the end of the BIOS image) and is executed in 16-bit real mode; it usually contains a | + | The x86 BIOS entry point is located at physical address <code>0xfffffff0</code> (usually corresponding to 16 bytes from the end of the BIOS image) and is executed in 16-bit real mode; it usually contains a jump instruction (either far or near). There are no other guarantees about BIOS image layout, although many vendors have developed in-house formats. |
[[UEFI]] firmware images usually contain an embedded [[Firmware File System]]. | [[UEFI]] firmware images usually contain an embedded [[Firmware File System]]. | ||
Revision as of 22:25, 7 March 2015
BIOS (Basic Input Output System), is a ROM chip containing code (firmware) to control peripherals attached to a wikipedia:PC.
The x86 BIOS entry point is located at physical address 0xfffffff0 (usually corresponding to 16 bytes from the end of the BIOS image) and is executed in 16-bit real mode; it usually contains a jump instruction (either far or near). There are no other guarantees about BIOS image layout, although many vendors have developed in-house formats.
UEFI firmware images usually contain an embedded Firmware File System.
