In brief, which is all I can do, the os2ldr contains some hardware dependent routines call DosHlp routines. Thanks to Pasha for pointing out that the ddk contains doshlp.inc which lists most of these (baseinc).<\/p>\n
The os2ldr contains a table of offsets that is passed to the kernel. The following is a structure I put together from this information and what I saw from a disassembled os2ldr (SMP v104a). The unknowns are not listed in the doshlp.inc.<\/p>\n
typedef struct _DOSHLPFUNCTIONS {
uint16_t TableVersion;
uint32_t DosHlpInit;
uint32_t DosHlpReboot;
uint32_t DosHlpNMI;
uint32_t DosHlpSizeMem;
uint32_t DosHlpConfig;
uint32_t DosHlpBaseDDList;
uint32_t DosHlpGetDriveParms;
uint32_t DosHlpInitSystemDump;
uint32_t DosHlpSystemDump;
uint32_t DosHlpReadSectors;
uint32_t DosHlpSerInit;
uint32_t DosHlpSetBaudRate;
uint32_t DosHlpSerIn;
uint32_t DosHlpSerOut;
uint32_t DosHlpToneOn;
uint32_t DosHlpToneOff;
uint32_t DosHlpGetMask;
uint32_t DosHlpSetMask;
uint32_t DosHlpSetRealMask;
uint32_t DosHlpSetProtMask;
uint32_t DosHlpSetDosEnv;
uint32_t DosHlpCallInt10;
uint32_t DosHlpProtGetMessage;
uint32_t DosHlpRealGetMessage;
uint32_t DosHlpRegisterTmrDD;
uint32_t DosHlpTmr16QueryTime;
uint32_t DosHlpEnableWatchdogNMI;
uint32_t DosHlpDisableWatchdogNMI;
uint32_t DosHlpInstallIRET;
uint32_t DosHlpDiscard;
uint32_t DosHlpInitInterrupts;
uint32_t DosHlpSetIRQMask;
uint32_t DosHlpSendEOI;
uint32_t DosHlpTmr32QueryTime;
uint32_t DosHlpTmrSetRollover;
uint32_t DosHlpInitNPX;
uint32_t DosHlpClrBusyNPX;
uint32_t DosHlpAckIntNPX;
uint32_t DosHlpWaitNPX;
uint32_t DosHlpValidNPXSwitch;
uint32_t DosHlpVNPXReset;
uint32_t DosHlpVNPXClrBusy;
uint32_t DosHlpWhyNMI;
uint32_t DosHlpAckNMI;
uint32_t DosHlpResetWatchdogNMI;
uint32_t DosHlpDisableCache;
uint32_t DosHlpFindParity;
uint32_t DosHlpEnableCache;
uint32_t DosHlpGetErrorLogPtr;
uint32_t DosHlpWriteErrorLog;
uint32_t DosHlpReadErrorLog;
uint32_t DosHlpResetParity;
uint32_t Unknown1;
uint32_t Unknown2;
uint32_t Unknown3;
uint32_t Unknown4;
uint32_t Unknown5;
uint32_t Unknown6;
uint32_t Unknown7;
uint32_t Unknown8;
uint32_t Unknown9;
uint32_t Unknown10;
uint32_t Unknown11;
} DOSHLPFUNCTIONS, *PDOSHLPFUNCTIONS;<\/p>\n","protected":false},"excerpt":{"rendered":"
In brief, which is all I can do, the os2ldr contains some hardware dependent routines call DosHlp routines. Thanks to Pasha for pointing out that the ddk contains doshlp.inc which […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_links_to":"","_links_to_target":""},"categories":[7,24,31],"tags":[],"class_list":["post-27","post","type-post","status-publish","format-standard","hentry","category-bootldr","category-os2","category-programming"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":32,"url":"https:\/\/www.mgreene.org\/?p=32","url_meta":{"origin":27,"position":0},"title":"My os2ldr project","author":"Mike","date":"June 29, 2008","format":false,"excerpt":"I have had sometime to play and committed the results to the SVN page:http:\/\/www.assembla.com\/wiki\/show\/os2ldr","rel":"","context":"In "bootldr"","block_context":{"text":"bootldr","link":"https:\/\/www.mgreene.org\/?cat=7"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":36,"url":"https:\/\/www.mgreene.org\/?p=36","url_meta":{"origin":27,"position":1},"title":"Entry into os2ldr","author":"Mike","date":"May 22, 2008","format":false,"excerpt":"Using Bochs I have the entry values into os2ldr when booted with BootJFS. One important note is that any of the filetable structure len fields will depend on the module version. Also, the 0x8800 segment might vary with machine types in the real world. It is calculated:uses INT 12 to\u2026","rel":"","context":"In "bootldr"","block_context":{"text":"bootldr","link":"https:\/\/www.mgreene.org\/?cat=7"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":37,"url":"https:\/\/www.mgreene.org\/?p=37","url_meta":{"origin":27,"position":2},"title":"ah… BootJFS and the process","author":"Mike","date":"May 18, 2008","format":false,"excerpt":"I\u2019m going to plagiarize from www.osfree.org and modify the text to fit my adventures with BootJFS.At the end of POST procedure the ROM BIOS initializes devices and gives control to int 19h interrupt routine, which loads 1st sector of the 1st boot device (a floopy, HDD or another). If the\u2026","rel":"","context":"In "bootldr"","block_context":{"text":"bootldr","link":"https:\/\/www.mgreene.org\/?cat=7"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":40,"url":"https:\/\/www.mgreene.org\/?p=40","url_meta":{"origin":27,"position":3},"title":"Easy gcc build environment","author":"Mike","date":"March 22, 2008","format":false,"excerpt":"Open Office for eCS-OS\/2 2.4 Beta1 is available (news post) and I installed it on my old SMP PIII box. Seems to work well! I guess the big milestone was just getting it going in the previous version.Also, Pasha has his updated os2ldr on hobbes (here). No chance to try\u2026","rel":"","context":"In "OS\/2"","block_context":{"text":"OS\/2","link":"https:\/\/www.mgreene.org\/?cat=24"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":859,"url":"https:\/\/www.mgreene.org\/?p=859","url_meta":{"origin":27,"position":4},"title":"New System76 Darter Pro 10 with Gentoo","author":"Mike","date":"December 28, 2024","format":false,"excerpt":"I decided to get a System76 Darter Pro 10. It was to replace my Thinkbook 14s which was over 5 years old. The Thinkbook had been a replacement for an IdeaPad Y470p purchased early in 2012. Before the IdeaPad and Thinkbook, there were Thinkpads of various types. I had a\u2026","rel":"","context":"In "Gentoo"","block_context":{"text":"Gentoo","link":"https:\/\/www.mgreene.org\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.mgreene.org\/wp-content\/uploads\/2024\/12\/system76_DP_spec.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.mgreene.org\/wp-content\/uploads\/2024\/12\/system76_DP_spec.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.mgreene.org\/wp-content\/uploads\/2024\/12\/system76_DP_spec.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.mgreene.org\/index.php?rest_route=\/wp\/v2\/posts\/27","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mgreene.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mgreene.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mgreene.org\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mgreene.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=27"}],"version-history":[{"count":0,"href":"https:\/\/www.mgreene.org\/index.php?rest_route=\/wp\/v2\/posts\/27\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.mgreene.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mgreene.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mgreene.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}