Specifications

AMD Geode™ GeodeROM Functional Specification 101
12
System Services 32087C
12.0System Services
GeodeROM supports INT 15h for certain standard system services (listed in Table 12-1). This section describes the inter-
faces for those services. INT 15h is used for Advanced Power Management (APM). See Section 17.0 "Power Management"
on page 239 for details. It is also used for backward compatibility with AMD’s Virtual System Architecture™ (VSA) technol-
ogy.:
Table 12-1. INT 15h System Services Support Functions
Function Subfunction Page Number
Function 24h - A20 Support 103
Subfunction 00h - Disable A20 Gate 103
Subfunction 01h - Enable A20 Gate 104
Subfunction 02h - Get A20 Gate Status 104
Subfunction 03h - A20 Support 105
Function 4Fh - Key Scan Hook 105
Function 53h 106
Subfunction 00h - APM Installation Check 106
Subfunction 01h - APM Real Mode Interface Connect 107
Subfunction 02h - APM Protected Mode 16-Bit Interface Connect 108
Subfunction 03h - APM Protected Mode 32-Bit Interface Connect 109
Subfunction 04h - APM Interface Disconnect 110
Subfunction 05h - CPU Idle 111
Subfunction 06h - CPU Busy 111
Subfunction 07h - Set Power State 112
Subfunction 08h - Enable/Disable Power Management 113
Subfunction 09h - Restore APM BIOS Power On 114
Subfunction 0Ah - Get Power Status 115
Subfunction 0Bh - Get PM Event 116
Subfunction 0Ch - Get Power State 117
Subfunction 0Dh - Enable/Disable Device Power Management 118
Subfunction 0Eh - APM Driver Version 119
Subfunction 0Fh - Engage/Disengage Power Management 120
Subfunction 10h - Get Capabilities 121
Subfunction 11h - Get/Set/Disable Resume Timer 122
Subfunction 12h - Enable/Disable Resume on Ring 123
Subfunction 13h - Enable/Disable Timer Based Requests 124
Function 86h - BIOS Wait 125