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Added .nbi as a format.

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This commit is contained in:
Michael Brown 2007-03-11 00:57:26 +00:00
parent 628f6eddcc
commit 37127ea90c
2 changed files with 69 additions and 0 deletions
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4
src/arch/i386/Makefile
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@ -80,6 +80,10 @@ MEDIA += dsk
OBJS_dskprefix = dskprefix zdskprefix
CFLAGS_zdskprefix = $(CFLAGS_ZPREFIX)
MEDIA += nbi
OBJS_nbiprefix = nbiprefix znbiprefix
CFLAGS_znbiprefix = $(CFLAGS_ZPREFIX)
MEDIA += hd
OBJS_hdprefix = hdprefix zhdprefix
CFLAGS_zhdprefix = $(CFLAGS_ZPREFIX)

65
src/arch/i386/prefix/nbiprefix.S Normal file
View File

@ -0,0 +1,65 @@
.text
.arch i386
.section ".prefix", "ax", @progbits
.section ".prefix.data", "aw", @progbits
.code16
.section ".prefix"
.org 0
nbi_header:
/*****************************************************************************
* NBI file header
*****************************************************************************
*/
file_header:
.long 0x1b031336 /* Signature */
.byte 0x04 /* 16 bytes header, no vendor info */
.byte 0
.byte 0
.byte 0 /* No flags */
.word 0x0000, 0x07c0 /* Load header to 0x07c0:0x0000 */
.word entry, 0x07c0 /* Start execution at 0x07c0:entry */
.size file_header, . - file_header
/*****************************************************************************
* NBI segment header
*****************************************************************************
*/
segment_header:
.byte 0x04 /* 16 bytes header, no vendor info */
.byte 0
.byte 0
.byte 0x04 /* Last segment */
.long 0x00007e00
.long _load_size - 512
.long _load_size - 512
.size segment_header, . - segment_header
/*****************************************************************************
* NBI entry point
*****************************************************************************
*/
entry:
/* Install low and high memory regions */
call install
/* Jump to .text16 segment */
pushw %ax
pushw $1f
lret
.section ".text16", "awx", @progbits
1:
pushl $main
pushw %cs
call prot_call
popl %eax /* discard */
/* Reboot system */
int $0x19
.previous
.size entry, . - entry
nbi_header_end:
.org 512