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/* First stage loader bootstrap for flash of a JavaStation.
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Copyright (C) 1996,1997,2000 Jakub Jelinek
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Copyright (C) 1999,2000 Pete Zaitcev
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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#define BLOCK_START 0x300 /* We are not a.out, so can use anything */
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#include "ieee32.h" /* IEEE32_OFFSET */
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#define LOAD_OFF 1024 /* Skip PROM interface buffer */
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sethi %hi(0x4000), buffer
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1: sethi %hi(0x10000), dest
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add buffer, %lo(chosen), %o1
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add buffer, %lo(finddevice), %o0
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add buffer, %lo(stdout), %o0
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ld [dest + 256], stdouth
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* Get phandle of flash memory.
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* Unlike other first stage loaders
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* we do not use "/chosen"."bootpath" value.
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* It's a feature, not a bug.
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add buffer, %lo(flashs), %o1
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add buffer, %lo(finddevice), %o0
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ld [dest + 16], fd /* phandle of /flash-memory */
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* Get "reg". We use it to find the base address,
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* which is different for 4MB, 8MB and 16MB SIMMs.
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add buffer, %lo(regs), %o0
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ld [dest + 260], %i2 /* 20400000 for 8MB SIMM */
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* Load 4 blocks of second stage loader with the map,
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* then all other blocks at 0x10000 (dest).
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* First of them will have an 'L' header embedded.
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or buffer, BLOCK_START, %l1
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add %l1, (3 * 512), %i5 /* Will read 4 blocks of block map */
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* But before we start the loop, get the block 0 number.
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* In other loaders we get it for free when 16 blocks of
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* bootstrap are loaded. In flash it is outside of ELF.
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add %i2, IEEE32_OFFSET, %i4
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sll %i3, 9, %o3 /* Convert blocks into bytes */
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/* srl %i3, 23, %o2 */ /* %o2 and %o3 make an 41 bits offset */
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* We use ASI=20 (BYPASS) to spare remapping work. Lazy, but works.
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* We do not unroll the loop because flash is slow and RAM is tight.
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mov 512, %i0 /* running cnt */
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mov %l1, %i1 /* running dest */
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add %i2, %o3, %i4 /* running source (physical addr) */
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/* We conviniently ignore upper bits of offset for flash is small. */
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add dest, LOAD_OFF, %l1
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ldub [dest + LOAD_OFF + 0x08], %o0
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/* flush dest + LOAD_OFF */ /* XXX Write-through cache on IIep */
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clr %o4 /* Important - not Ultra */
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or promvec, 1, %o0 /* XXX Gross... */
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jmpl dest + LOAD_OFF, %g0
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add buffer, %lo(exits), %o0
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* getprop(node:fd, name:%o0) {
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* cif_handler:promvec("getprops", node, name, dest+256, 1024);
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add buffer, %lo(getprops), %o2
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jmpl promvec + %g0, %g0
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ba prom31 /* one of many tail recustion -O's */
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add buffer, %lo(write), %o0
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jmpl promvec + %g0, %g0
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jmpl promvec + %g0, %g0
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.asciz "/flash-memory"
added
removed
first/ieee32.S
