Information processing apparatus and power supply control method
In standby mode, memory contents are saved to a hard disk. After AC power has been removed by disconnecting the AC plug, when the AC power is restored the data saved on the hard disk is automatically restored into memory to set the power-saving mode back to the standby mode. When the power is turned on next, quick resumption from standby mode can be accomplished.
1. A power supply control method for an information processing apparatus, comprising:
saving information stored in a volatile storage unit into a nonvolatile storage unit, when said information processing apparatus enters a hibernation state;
stopping an operating system working in said information processing apparatus;
setting first information indicating that said information processing apparatus is in a standby state through a process executed independently of said operating system;
setting said information processing apparatus in the standby state after setting said first information through said process executed independently of said operating system, to hold information on a peripheral device in said volatile storage unit;
checking whether or not said first information exists when said information processing apparatus is activated;
calling said operating system after checking the information on the peripheral device in said volatile storage unit and restoring said information saved in the nonvolatile storage unit into the volatile storage unit through said operating system, if said first information exists;
entering said information processing apparatus into a turn-on state; and,
entering said information processing apparatus from the hibernation state into the turn-on state, if said first information does not exist.
2. The power supply control method as claimed in claim 1 , wherein said nonvolatile storage unit is a hard disk.
3. An information processing apparatus, comprising;
a volatile storage unit storing information to use for said processing;
a nonvolatile storage unit storing information;
a power control unit controlling and detecting power supply into said information processing apparatus; and
a processing unit processing information stored in said volatile storage unit;
said processing unit further comprising,
means for saving information stored in the volatile storage unit into the nonvolatile storage unit, when said information processing apparatus enters a hibernation state;
means for setting first information indicating that said information processing apparatus is in a standby state through a process executed independently of an operating system,
means for setting said information processing apparatus in the standby state after setting said first information through said process executed independently of said operating system, to hold information on a peripheral device in said volatile storage unit;
means for checking whether or not said first information exists when said information processing apparatus is activated, and further calling said operating system after checking the information on the peripheral device in said volatile storage unit and restoring said information saved in the nonvolatile storage unit into the volatile storage unit through said operating system, if said first information exists;
means for entering said information processing apparatus into a turn-on state; and,
means for entering said information processing apparatus from the hibernation state into the turn-on state, if said first information does not exist.
4. The information processing apparatus as claimed in claim 3 , wherein said nonvolatile storage unit is a hard disk.