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BIOS32_SERVICE (9) NetBSD/i386 Kernel Developer’s Manual BIOS32_SERVICE (9)NAMEbios32_service —locate BIOS32 serviceSYNOPSIS#include intbios32_service(uint32_t service , bios32_entry_t e , bios32_entry_info_t ei);DESCRIPTIONThe bios32_service() function calls the BIOS32 to locate the specified BIOS32 service service andfills in the entry point information e and ei.SEE ALSObioscall(9)NetBSD 3.0 June 17, 2001 1
BIOSCALL (9) NetBSD/i386 Kernel Developer’s Manual BIOSCALL (9)NAMEbioscall —call system BIOS function from real modeSYNOPSIS#include voidbioscall(int function , struct bioscallregs ∗regs);DESCRIPTIONThe bioscall function switches the processor into real mode, calls the BIOS interrupt numberedfunction, and returns to protected mode.This function is intended to be called during the initial system bootstrap when necessary to probe devices orpseudo-devices.The register values specified by ∗regs (with one exception) are installed before the BIOS interrupt is called.The processor flags are handled specially. Only the following flags are passed to the BIOS from the registersin regs (the remainder come from the processor’s flags register at the time of the call): PSL_C, PSL_PF,PSL_AF, PSL_Z, PSL_N, PSL_D, PSL_V.The bioscallregs structure is defined to contain structures for each register, toallow access to 32-, 16- or 8-bitwide sections of the registers. Definitions are provided which simplify access to the union members.RETURN VALUESbioscall fills in ∗regs with the processor registers as returned from the BIOS call.EXAMPLESThe Advanced Power Management driver calls bioscall by setting up a register structure with the APMinstallation check and device types in registers ax and bx, then calls the BIOS to fetch the details for callingthe APM support through a protected-mode interface. The BIOS returns these details in the registers:#include #include struct bioscallregs regs;regs.AX = APM_BIOS_FN(APM_INSTALLATION_CHECK);regs.BX = APM_DEV_APM_BIOS;regs.CX = regs.DX = 0;regs.ESI = regs.EDI = regs.EFLAGS = 0;bioscall(APM_SYSTEM_BIOS, &regs);CODE REFERENCESsys/arch/i386/i386/bioscall.s, sys/arch/i386/bioscall/biostramp.SREFERENCESapm(4)HISTORYbioscall first appeared in NetBSD 1.3.BUGSNot all BIOS functions are safe to call through the trampoline, as they may depend on system state which hasbeen disturbed or used for other purposes once the NetBSD kernel is running.NetBSD 3.0 October 1, 1998 1
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