| file: boot_ustar.S
| author: chapuni(webmaster@chapuni.com)
| ITOH Yasufumi
| minoura@NetBSD.org
|
| $NetBSD: boot_ustar.S,v 1.8 2016/06/25 04:08:57 isaki Exp $
| supports floppy only
#include <sys/reboot.h>
#include <machine/asm.h>
#include <machine/bootinfo.h>
#include "iocscall.h"
#define BOOT_ERROR(s) jbsr boot_error; .asciz s; .even
#define SRAM_MEMSIZE (0x00ed0008)
.text
ASENTRY_NOPROFILE(start)
ASENTRY_NOPROFILE(top)
bras _ASM_LABEL(entry0)
.ascii "SHARP/"
.ascii "X680x0"
.word 0x8199,0x94e6,0x82ea,0x82bd
.word 0x8e9e,0x82c9,0x82cd,0x8cbb
.word 0x8ec0,0x93a6,0x94f0,0x8149
.word 0
ASENTRY_NOPROFILE(entry0)
IOCS(__BOOTINF)
lsll #8,%d0 | clear MSByte
lsrl #8,%d0 |
|
| 0x80...0x8F SASI
| 0x90...0x93 Floppy
| 0xED0000...0xED3FFE SRAM
| others ROM (SCSI?)
|
movel %d0,%d1
clrb %d1
tstl %d1
jne boot_dev_unsupported
bra _ASM_LABEL(entry)
| Disklabel= 404bytes
| Since LABELLOFFSET in <machine/disklabel.h> is 0x40,
| entry must be after 0x000001d4 (0x000021d4)
nop
GLOBAL(disklabel)
.space 404
ASENTRY_NOPROFILE(entry)
|
| SASI or Floppy
|
movel %d0,%d6
andib #0xFC,%d0
cmpib #0x90,%d0
jne boot_dev_unsupported | boot from SASI?
|
| Floppy
| read /boot.
|
| This boot_ustar has the 1KB size restriction and
| it is impossible to detect /boot's actual size in this
| restriction. So define BOOT_MAXSIZE (in Makefile) as
| the size enough to read /boot whole.
|
andib #0x03,%d0 | drive # (head=0)
jbsr check_fd_format
moveb %d6,%d2
lslw #8,%d2
moveq #0x70,%d1
orw %d2,%d1 | PDA*256 + MODE
movel %d0,%d2 | read position (first sector)
movel #(BOOT_MAXSIZE+8192+0x200),%d3 | read bytes
moval #(BOOT_TEXTADDR-8192-0x200-32),%a1
moval %a1,%a4 | save buffer addr
IOCS(__B_READ)
jra boot_read_done
#include "chkfmt.s"
boot_dev_unsupported:
BOOT_ERROR("unsupported boot device")
booterr_msg: .ascii "\r\n\n"
.ascii BOOT
.asciz ": "
reboot_msg: .asciz "\r\n[Hit key to reboot]"
.even
ASENTRY_NOPROFILE(boot_error)
lea %pc@(booterr_msg),%a1
IOCS(__B_PRINT)
moveal %sp@+,%a1
IOCS(__B_PRINT)
lea %pc@(reboot_msg),%a1
IOCS(__B_PRINT)
| wait for a key press (or release of a modifier)
IOCS(__B_KEYINP)
| issue software reset
trap #10
| NOTREACHED
boot_read_done:
lea %a4@(8192),%a1 | USTAR header
cmpl #0x55535441,%a1@ | filename `USTA
bne error_invalidname
cmpl #0x522e766f,%a1@(4) | R.vo...'
bne error_invalidname
cmpl #0x00757374,%a1@(256) | magic `\0ust'
bne error_invalidfs
cmpw #0x6172,%a1@(260) | magic `ar'
bne error_invalidfs
lea %a1@(0x200),%a2 | a.out header
movml %a2@+,%d0-%d4/%a5
addal #8,%a2 | start of text
cmpal #BOOT_TEXTADDR,%a5
bne error_invalidboot
cmpl #0x00870107,%d0 | a.out magic
bne error_invalidmagic
addl %d2,%d1 | a_text+a_data
movl %d3,%d4 | save a_bss
addl %d1,%d3 | a_text+a_data+a_bss
/* clear out bss */
lea %a2@(%d1),%a3
1: movb #0,%a3@+
subl #1,%d4
bne 1b
/* set args for /boot */
pea %a2@(%d3) | esym (unused)
movel SRAM_MEMSIZE,%sp@- | lastpa (unused)
pea %a2@ | firstpa (unused)
movq #0,%d0 | unused
movq #0,%d1 | unused
movq #0,%d2 | unused
movq #0,%d3 | unused
movq #0,%d4 | unused
movq #0,%d5 | unused
andil #3,%d6 | bootdev
swap %d6
addil #(B_DEVMAGIC+X68K_MAJOR_FD),%d6
movl #RB_SINGLE,%d7 | boothowto (unused)
moval %a2,%a0 | entry
moval %d0,%a1 | unused
moval %d0,%a2 | unused
moval %d0,%a3 | unused
moval %d0,%a4 | unused
moval %d0,%a5 | unused
moval %d0,%a6 | unused
jmp %a0@ | here we go
error_invalidboot:
error_invalidname: BOOT_ERROR("Illegal secondary boot");
error_invalidfs:
error_invalidmagic: BOOT_ERROR("Invalid magic")
ASGLOBAL(first_kbyte)