Changeset 128

Timestamp:

Apr 8, 2017, 12:27:27 AM (8 years ago)

Author:

Ben Rietbroek

Message:

New storage method for disk information [v1.1.1-testing]

Having separate areas for BIOS, INT13(X) and LVM information makes
addressing them a bit tedious. Now all disk information is going to be
clustered in one structure with an instance of that structure for each
disk. The disk information will be gathered during the scanning phase
so it can be easily accessed afterwards.

CAUTION:
This is a testbuild !
AirBoot uses the BIOS to access disks and a small coding error can trash
partition tables or other vital disk structures. You are advised to make
backups of TRACK0 and EBRs before using this testbuild. More info at:
​https://rousseaux.github.io/netlabs.air-boot/pdf/AirBoot-v1.1.0-manual.pdf

File:

• trunk/bootcode/airboot.asm (modified) (3 diffs)

trunk/bootcode/airboot.asm

@@ -158 +158 @@
 TextChar_WinRep6            equ     0D8h
 
+
+; -----------------------------------------------------------------------------
+;                                                             DISK INFORMATION
+; -----------------------------------------------------------------------------
+; Offsets into the DISKINFO structures located in the array [DiskInformation]
+
+; BIOS disk number and MBR flags
+LocDISKINFO_DiskNum         equ     00h     ; BYTE  - BIOS disk number (80h etc)
+LocDISKINFO_MbrFlags        equ     01h     ; BYTE  - Valid MBR, etc
+
+; BIOS INT13 Info
+LocDISKINFO_I13_Secs        equ     02h     ; WORD  - Max 63
+LocDISKINFO_I13_Heads       equ     04h     ; WORD  - Max 16 or 255
+LocDISKINFO_I13_Cyls        equ     06h     ; WORD  - Max 1024
+
+; BIOS INT13X Info
+LocDISKINFO_I13X_Flags      equ     08h     ; WORD  - CHS valid, etc
+LocDISKINFO_I13X_SecSize    equ     0ah     ; WORD  - Normally 512 bytes
+LocDISKINFO_I13X_Secs       equ     0ch     ; DWORD - Max 63 ?
+LocDISKINFO_I13X_Heads      equ     10h     ; DWORD - Max 255 ?
+LocDISKINFO_I13X_Cyls       equ     14h     ; DWORD - Max 2_32 (4294967296)
+LocDISKINFO_I13X_SecsLBA    equ     18h     ; QWORD - Max 2^64 (4294967296^2)
+LocDISKINFO_I13X_HostBus    equ     20h     ; 4 bytes
+LocDISKINFO_I13X_Interface  equ     24h     ; 8 bytes
+
+; OS/2 LVM Info
+LocDISKINFO_LVM_Flags       equ     2ch     ; WORD  - OS/2 ext geo, etc
+LocDISKINFO_LVM_MasterLBA   equ     2eh     ; DWORD - Max 254
+LocDISKINFO_LVM_Secs        equ     32h     ; DWORD - Max 255
+LocDISKINFO_LVM_Heads       equ     36h     ; DWORD - Max 255
+LocDISKINFO_LVM_Cyls        equ     3ah     ; DWORD - Max 65536
+
+; Custom Info
+LocDISKINFO_Flags           equ     3eh     ; WORD  - Custom flags, dunno yet
+
+; Size of this structure
+DISKINFO_Size               equ     40h     ; Size to be allocated
 
 
@@ -180 +217 @@
 ; Signature relative to start of MBR/EBR
 LocBR_Magic                 equ     510 ; Offset of 0AA55h signature
+
 
 ; -----------------------------------------------------------------------------
@@ -2405 +2443 @@
                             ALIGN   16
 
+; Array of DISKINFO structures
+DiskInformation             db      MaxDisks  dup(DISKINFO_Size dup(?))
+                            ALIGN   16
 
 ; -----------------------------------------------------------------------------