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/* First stage loader bootstrap for SUNW,Ultra's IEEE 1275 PROM
Copyright (C) 1996,1997 Jakub Jelinek
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#define BLOCK_START 0x1dc
#define promvec %l5
#define buffer %l0
#define fd %l6
#define stdouth %l7
#define dest %l4
.text
.align 4
.global _start, letter_here
_start:
sethi %hi(0x4000), buffer
or buffer, (BLOCK_START + 3 * 512), %i5
sethi %hi(0x10000), dest
mov %o4, promvec
add buffer, %lo(chosen), %o1
call prom11
add buffer, %lo(finddevice), %o0
ldx [dest + 32], fd
call getprop
add buffer, %lo(stdout), %o0
lduw [dest + 256], stdouth
call putchar
mov 'S', %o0
call getprop
add buffer, %lo(bootpath), %o0
add dest, 256, %o0
mov ':', %o4
2:
ldub [%o0], %o3
brz,pn %o3, 3f
cmp %o3, %o4
bne,a,pt %icc, 2b
inc %o0
3:
stb %o4, [%o0]
letter_here:
mov 0xDD, %o4
stb %o4, [%o0 + 1]
stb %g0, [%o0 + 2]
add dest, 256, %o1
call prom11
add buffer, %lo(open), %o0
ldx [dest + 32], fd
or buffer, BLOCK_START, %l1
mov %l1, %l2
5:
lduw [%l2], %l3
add %l2, 4, %l2
brz,pn %l3, 7f
sll %l3, 9, %o3
srl %l3, 23, %o2
call rwprom31
add buffer, %lo(seek), %o0
ldx [dest + 48], %o0
brlz,pn %o0, 9f
mov 512, %o3
mov %l1, %o2
call rwprom31
add buffer, %lo(read), %o0
ldx [dest + 48], %o0
cmp %o0, 512
bne,pn %icc, 9f
cmp %l1, %i5
bne,pt %xcc, 5b
add %l1, 512, %l1
call putchar
mov 'I', %o0
ba,pt %xcc, 5b
add dest, 1024, %l1
7:
mov fd, %o1
call prom11
add buffer, %lo(close), %o0
ldub [dest + 1024 + 0x08], %o0
cmp %o0, 'L'
bne,a,pn %icc, 10f
add buffer, %lo(exit), %o0
call putchar
flush dest + 1024
jmpl dest + 1024, %g0
mov promvec, %o4
putchar:
stb %o0, [buffer]
mov stdouth, %o1
mov buffer, %o2
mov 1, %o3
ba,pt %xcc, prom31
add buffer, %lo(write), %o0
9:
add buffer, %lo(exit), %o0
10:
call prom11
getprop:
stx %o0, [dest + 32]
add dest, 256, %o0
stx %o0, [dest + 40]
mov 1024, %o0
stx %o0, [dest + 48]
mov fd, %o1
add buffer, %lo(getprops), %o0
mov 4, %o2
stx %o2, [dest + 8]
2:
ba,pt %xcc, 1f
prom11:
mov 1, %o2
stx %o2, [dest + 8]
1:
stx %o0, [dest]
stx %o2, [dest + 16]
stx %o1, [dest + 24]
jmpl promvec + %g0, %g0
mov dest, %o0
rwprom31:
mov fd, %o1
prom31:
mov 3, %o4
stx %o4, [dest + 8]
stx %o2, [dest + 32]
ba,pt %xcc, 2b
stx %o3, [dest + 40]
finddevice:
.asciz "finddevice"
getprops:
.asciz "getprop"
bootpath:
.asciz "bootpath"
stdout:
.asciz "stdout"
open:
.asciz "open"
close:
.asciz "close"
seek:
.asciz "seek"
read:
.asciz "read"
write:
.asciz "write"
chosen:
.asciz "/chosen"
exit:
.asciz "exit"
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