Displaying 4 results from an estimated 4 matches for "detect_bios_type".
2009 Mar 30
0
[PATCH 3/3] v2: isohdpfx: Ctrl-key press forces load from first hard disk
...+ /* Provide a way for the user to force boot from first hard-disk by pressing a Ctrl key */
+get_shift_keys: /* Provide a way for the user to force CHS addressing mode by pressing either Shift key */
+ testb $0x04, 0x0417 /* I/O memory-mapped keyboard shift flags: control key pressed? */
+ jz detect_bios_type
+force_first_hard_disk:
+ movb $0x80, -6(%bp) /* offset from top-of-stack to drive number; force it to be first hard disk */
+ movb $0x80, %dl /* change the drive number about to be used in detect_bios_type */
+
+detect_bios_type:
/* Check to see if we have EBIOS */
pushw %dx /* drive number...
2009 Mar 30
2
[PATCH 1/1] v3: Add Diagnostic MBR for trouble-shooting BIOS boot-order problems.
.../
+ testb $0x04, 0x0417 /* I/O memory-mapped keyboard shift flags: control key pressed? */
+ jz shift_test
+force_first_hard_disk:
+ movb $0x80, -6(%bp) /* offset from top-of-stack to drive number; force it to be first hard disk */
+ movb $0x80, %dl /* change the drive number about to be used in detect_bios_type */
+shift_test:
+ testb $0x03, 0x0417 /* left or right shift-keys pressed? */
+ jnz use_chs_addressing /* if so, skip detection of BIOS type */
+
+detect_bios_type:
+ /* try to use the BIOS extension for LBA (Logical Block Addressing). */
+ /* inherit drive number in DL from BIOS */
+ movw...
2009 Mar 30
2
[PATCH 1/1] v2 Add Diagnostic MBR for trouble-shooting
...S addressing mode by pressing either Shift key */
+ movb $0x02, %ah /* function: get keyboard shift flags */
+ int $0x16 /* read keys; shift flags returned in AL */
+ testb $0x03, %al /* left or right shift-keys pressed? */
+ jnz use_chs_addressing /* if so, skip detection of BIOS type */
+
+detect_bios_type:
+ /* try to use the BIOS extension for LBA (Logical Block Addressing). */
+ movb (drive_number), %dl
+ movw $0x55aa, %bx /* required */
+ movb $0x41, %ah /* query presence of extended BIOS functions (EBIOS) */
+ int $0x13 /* call BIOS */
+ jc use_chs_addressing /* carry flag will be se...
2009 Mar 30
0
[PATCH 1/1] Add Diagnostic MBR for trouble-shooting
...S addressing mode by pressing either Shift key */
+ movb $0x02, %ah /* function: get keyboard shift flags */
+ int $0x16 /* read keys; shift flags returned in AL */
+ testb $0x03, %al /* left or right shift-keys pressed? */
+ jnz use_chs_addressing /* if so, skip detection of BIOS type */
+
+detect_bios_type:
+ /* try to use the BIOS extension for LBA (Logical Block Addressing). */
+ movb (drive_number), %dl
+ movw $0x55aa, %bx /* required */
+ movb $0x41, %ah /* query presence of extended BIOS functions (EBIOS) */
+ int $0x13 /* call BIOS */
+ jc use_chs_addressing /* carry flag will be se...