JPH0640293B2 - Information processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an information processing apparatus that executes a desired initialization process immediately after power-on or reset.

[Prior Art] Conventionally, in an information processing apparatus using a microcomputer, the processing performed immediately after power-on or the like has been uniform. For example, the following is known as the initialization process related to the start-up / reset, which is a factor that requires the initialization of the microprocessor.

(1) There is no distinction between a power supply and a reset, and both perform the same initialization processing and then start a specific control program.

(2) Although the power-on and the reset are distinguished from each other, the predetermined process is uniformly executed by using the power switch and the reset switch as activation factors. An example of the power-on process and the reset process in the case of (2) will be given below.

Power-on process ... Microprocessor test, base RA
M test, stack set, various BIOS initialization and tests, timer initialization, VRAM test,
RAM test, control program start, reset process ... Microprocessor test, base RA
M test, stack set, various BIOS initialization and test, timer initialization, control program start, and initialization processing at power-on and at reset by interrupt of reset are independent of the system. Exists as a request. When each request is generated, a predetermined interrupt vector is referred to and the corresponding initialization process is executed. Of course, in a system that does not distinguish between the two, the processing is moved to the same address where the initialization processing program is placed, and the same initialization processing is executed.

Also, recently, due to the development of backup technology, it is becoming possible to retain various information even after the power is cut off. If the amount of stored information increases even when the power is turned off, it is not enough to uniformly perform a simple process such as initializing everything when the power is turned on. Need to be carried out. However, no technique has been proposed yet that accurately deals with such a situation.

[Problems to be Solved by the Invention] As described above, in the conventional information processing apparatus, uniform processing is performed regardless of whether a power-on request is made or a reset request is made. For example, even when the same power is turned on, different processing cannot be performed depending on the situation when the power is turned off.

Also, if a reset interrupt occurs during the initialization process when the power is turned on, the process when the power is turned on is interrupted and the initialization process at the reset interrupt is executed. It has also been pointed out that there is a possibility that an error may occur when trying to launch the control program while the processing is incomplete. It was also considered that the system could not start up in a desired state.

[Object] An object of the present invention is to solve the above-mentioned problems and to realize an information processing apparatus capable of executing different initialization processing for power-on processing request information. Here, the power-on process request information is, for example, information set when the power is cut off.

[Summary of the Invention] An information processing apparatus of the present invention includes an information processing apparatus that includes a microprocessor that performs various processes based on a program prepared in advance, and a storage memory that stores written information even when power is turned off. A storage unit that stores initialization processing to be executed when a factor that requests activation of the microprocessor such as power-on or reset occurs, and processing after power-on to the storage memory when power is cut off. Request information storage means for storing power-on process request information indicating the type of power-on, and a power-source stored in the storage memory when the occurrence of a factor that requires the activation of the microprocessor, such as power-on or reset, is detected. Initialization processing executing means for executing a specific processing of the initialization processing stored in the storage unit based on the input processing request information. The gist.

As a result, the initialization process based on the power-on process request information is executed when a factor related to the start-up occurs.

[Examples] Examples of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic block diagram of an embodiment of the present invention.
In FIG. 1, 1 is a microprocessor (hereinafter, MP
U is abbreviated), 2 is a main memory such as RAM, and 3 is an initial program loader (hereinafter referred to as IPL) RO including a power-on processing program and a reset processing program.
M, 4 is a memory using CMOS with low power consumption (hereinafter referred to as CMOS), 5 is a power source for always backing up CMOS 4, 6 is a reset signal output from a circuit (not shown) for detecting operation of a reset button (not shown) Reference numeral 7 is a power-down signal line for detecting the interruption of the power supply before the voltage drop of a power supply unit (not shown) which supplies power to the system, and 8 is a data bus. The reset signal line 6 and the power-down signal line 7 are directly input to the MPU 1, both of which are high-priority interrupt factors with respect to the MPU 1.

Since the CMOS 4 is backed up by the power supply 5, it is used as a storage memory for storing the written data even after the power supply to the device is cut off.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to the flow charts shown in FIGS. It should be noted that in both figures, the numbers sandwiched by the symbol <> represent the step numbers of the processing.

When the power switch (not shown) is turned off during the operation of the MPU 1 (step 1), the power down signal line 7 causes a power down interrupt. Then, the operation shown in the flowchart of FIG. 2 starts, the interrupt routine at the time of power off is started (step 2), and then the power on processing request information is set in the CMOS 4. (Step 3).

On the other hand, when the reset button is pressed and a reset interrupt signal is generated on the reset signal line 6, the CMOS 4 is powered on.
No processing request information is set.

As a result, the power-on processing request information is set in the CMOS 4 when the power is cut off, and is not set when the power is reset. After the power is turned off and the power is next turned on, or after the reset time which is determined by hardware by operating the reset button has elapsed, the processing shown in the flowchart of FIG. 3 is executed (step 11). ).

When the power is turned on or the reset button is pressed (step 11), the system initialization routine of FIG. 3 (step 12) is executed. In step 12, this process is common to the power-on and the reset button operation. The program of this system initialization routine is stored in the IPLROM 3, and starts processing from the same position both when the power is turned on and when it is reset, and after performing common processing such as base RAM test or stack set, On the way, the power-on processing request information in the CMOS 4 is checked (step 13).

Here, if the power-on processing request information is set, the power-on-only processing (step 14, left in FIG. 3)
If it is not set, a reset-only process is performed (step 14, right in FIG. 3). And
After the power-on processing is completed, the power-on processing request information in the CMOS 4 is cleared (step 15).

After this processing (step 15) or the reset processing (step 14) is completed, the system initialization routine is ended (step 16). Furthermore, after that, IPLR
Then, the control program stored in the OM3 is executed.
(Step 17).

As described above, in the information processing apparatus of this embodiment, if the processing shown in FIG. 2 is executed when the power is cut off, the power ON processing request information is set when the power is cut off, and then the power is turned on. When is turned on, the power-on process is executed according to this information. As the power-on process, not only the item for checking the memory is different from that at the time of operating the reset button, but also a process for reproducing the same usage environment as the previous time can be considered.

The power-on processing request information is cleared after the power-on processing is executed. On the other hand, when the reset button is operated, the power-on processing request information is not set, so the reset processing is performed. That is, even if the processing routine of the same processing is activated, whether the activation is caused by the power-on or the reset is the power-on state stored in the CMOS 4 whose power is always backed up.
It is distinguished according to the processing request information, and the processing is executed according to the power-on or the operation of the reset V button. Further, if it is specified that the power-on process request information is not set when the power is turned off, even if the initialization process is the same when the power is turned on, the same initialization process as when the reset button is operated is performed.

If the interrupt mask shown in FIG. 2 is masked so that the interrupt process shown in FIG. 2 is not activated when the power is turned off, the same process as the reset process is executed when the power is turned on because the power-on process request information is not set. Will be done. That is, regardless of the activation factor of the initialization processing routine, the required initialization processing is executed based on the power-on processing request information.

Further, according to this embodiment, even if the reset button is pressed during the execution of the power-on process, the reset process is not performed, and the initialization process is the same as the process performed when the power is turned on. Also has the advantage that

Although not explicitly shown in FIG. 1, an interrupt routine for setting power-on processing request information in the CMOS 4 at power-off and a CMOS after power-on processing is completed.
The means for clearing the power-on processing request information 4 is stored in the IPLROM 3 of FIG. 1 as a program, for example. Further, in the present embodiment, the power-on process and the reset process have been described as the processes up to the start of the control program, but this is merely an example, and the initialization process, for example, sets the power-on process request information. In this case, it is possible to execute the control program from the middle after the power-on process.

[Effects of the Invention] As described in detail above, according to the information processing apparatus of the present invention, a specific initial state is determined based on the power-on process request information with respect to initialization request factors such as power-on and reset. The excellent effect that the conversion process can be executed is achieved. Further, since the power-on process request information is stored in the storage memory, it is possible to surely execute the specific process when returning from the power shutdown.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of an information processing apparatus according to an embodiment of the present invention. FIG. 2 and FIG. 3 are flowcharts showing each processing executed in the information processing apparatus of the embodiment. 1 ... MPU, 2 ... main memory 3 ... IPL ROM, 4 ... CMOS 5 ... backup power supply

Claims (1)

[Claims] 1. An information processing apparatus comprising: a microprocessor for performing various processes based on a program prepared in advance; and a storage memory for storing written information even when power is turned off. A storage unit that stores initialization processing that is executed when a factor that requests the activation of the microprocessor, such as a reset, occurs, and a power-on processing that indicates the type of processing after power-on to the storage memory when the power is shut off Request information storage means for storing request information, and based on the power-on process request information stored in the storage memory when the occurrence of a factor requesting activation of the microprocessor such as power-on or reset is detected. An initialization process executing means for executing a specific process among the initialization processes stored in the storage section.