/* Overlay manager for SPU.
Copyright (C) 2006-2014 Free Software Foundation, Inc.
This file is part of the GNU Binutils.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* MFC DMA defn's. */
#define MFC_GET_CMD 0x40
#define MFC_MAX_DMA_SIZE 0x4000
#define MFC_TAG_UPDATE_ALL 2
#define MFC_TAG_ID 0
/* Register usage. */
#define reserved1 $75
#define parm $75
#define tab1 reserved1
#define tab2 reserved1
#define vma reserved1
#define oldvma reserved1
#define newmask reserved1
#define map reserved1
#define reserved2 $76
#define off1 reserved2
#define off2 reserved2
#define present1 reserved2
#define present2 reserved2
#define sz reserved2
#define cmp reserved2
#define add64 reserved2
#define cgbits reserved2
#define off3 reserved2
#define off4 reserved2
#define addr4 reserved2
#define off5 reserved2
#define tagstat reserved2
#define reserved3 $77
#define size1 reserved3
#define size2 reserved3
#define rv3 reserved3
#define ealo reserved3
#define cmd reserved3
#define off64 reserved3
#define tab3 reserved3
#define tab4 reserved3
#define tab5 reserved3
#define reserved4 $78
#define ovl reserved4
#define rv2 reserved4
#define rv5 reserved4
#define cgshuf reserved4
#define newovl reserved4
#define irqtmp1 reserved4
#define irqtmp2 reserved4
#define reserved5 $79
#define target reserved5
#define save1 $74
#define rv4 save1
#define rv7 save1
#define tagid save1
#define maxsize save1
#define pbyte save1
#define pbit save1
#define save2 $73
#define cur save2
#define rv6 save2
#define osize save2
#define zovl save2
#define oldovl save2
#define newvma save2
#define save3 $72
#define rv1 save3
#define ea64 save3
#define buf3 save3
#define genwi save3
#define newmap save3
#define oldmask save3
#define save4 $71
#define irq_stat save4
.text
.align 4
.type __rv_pattern, @object
.size __rv_pattern, 16
__rv_pattern:
.word 0x00010203, 0x10111213, 0x80808080, 0x80808080
.type __cg_pattern, @object
.size __cg_pattern, 16
__cg_pattern:
.word 0x04050607, 0x80808080, 0x80808080, 0x80808080
.type __ovly_current, @object
.size __ovly_current, 16
__ovly_current:
.space 16
/*
* __ovly_return - stub for returning from overlay functions.
*
* On entry the four slots of $lr are:
* __ovly_return, prev ovl index, caller return addr, undefined.
*
* Load the previous overlay and jump to the caller return address.
* Updates __ovly_current.
*/
.align 4
.global __ovly_return
.type __ovly_return, @function
__ovly_return:
ila tab1, _ovly_table - 16 # 0,2 0
shlqbyi ovl, $lr, 4 # 1,4 0
#nop
shlqbyi target, $lr, 8 # 1,4 1
#nop; lnop
#nop; lnop
shli off1, ovl, 4 # 0,4 4
#lnop
#nop
hbr ovly_ret9, target # 1,15 5
#nop; lnop
#nop; lnop
#nop
lqx vma, tab1, off1 # 1,6 8
#ifdef OVLY_IRQ_SAVE
nop
stqd save4, -64($sp) # 1,6 9
#else
#nop; lnop
#endif
#nop; lnop
#nop; lnop
#nop; lnop
#nop; lnop
#nop
rotqbyi size1, vma, 4 # 1,4 14
#nop
stqd save3, -48($sp) # 1,6 15
#nop
stqd save2, -32($sp) # 1,6 16
#nop
stqd save1, -16($sp) # 1,6 17
andi present1, size1, 1 # 0,2 18
stqr ovl, __ovly_current # 1,6 18
#nop; lnop
#nop
brz present1, do_load # 1,4 20
ovly_ret9:
#nop
bi target # 1,4 21
/*
* __ovly_load - copy an overlay partion to local store.
*
* On entry $75 points to a word consisting of the overlay index in
* the top 14 bits, and the target address in the bottom 18 bits.
*
* Sets up $lr to return via __ovly_return. If $lr is already set
* to return via __ovly_return, don't change it. In that case we
* have a tail call from one overlay function to another.
* Updates __ovly_current.
*/
.align 3
.global __ovly_load
.type __ovly_load, @function
__ovly_load:
#if OVL_STUB_SIZE == 8
########
#nop
lqd target, 0(parm) # 1,6 -11
#nop; lnop
#nop; lnop
#nop; lnop
#nop; lnop
#nop; lnop
#nop
rotqby target, target, parm # 1,4 -5
ila tab2, _ovly_table - 16 # 0,2 -4
stqd save3, -48($sp) # 1,6 -4
#nop
stqd save2, -32($sp) # 1,6 -3
#nop
stqd save1, -16($sp) # 1,6 -2
rotmi ovl, target, -18 # 0,4 -1
hbr ovly_load9, target # 1,15 -1
ila rv1, __ovly_return # 0,2 0
#lnop
#nop; lnop
#nop
lqr cur, __ovly_current # 1,6 2
shli off2, ovl, 4 # 0,4 3
stqr ovl, __ovly_current # 1,6 3
ceq rv2, $lr, rv1 # 0,2 4
lqr rv3, __rv_pattern # 1,6 4
#nop; lnop
#nop; lnop
#nop
lqx vma, tab2, off2 # 1,6 7
########
#else /* OVL_STUB_SIZE == 16 */
########
ila tab2, _ovly_table - 16 # 0,2 0
stqd save3, -48($sp) # 1,6 0
ila rv1, __ovly_return # 0,2 1
stqd save2, -32($sp) # 1,6 1
shli off2, ovl, 4 # 0,4 2
lqr cur, __ovly_current # 1,6 2
nop
stqr ovl, __ovly_current # 1,6 3
ceq rv2, $lr, rv1 # 0,2 4
lqr rv3, __rv_pattern # 1,6 4
#nop
hbr ovly_load9, target # 1,15 5
#nop
lqx vma, tab2, off2 # 1,6 6
#nop
stqd save1, -16($sp) # 1,6 7
########
#endif
#nop; lnop
#nop; lnop
#nop
shufb rv4, rv1, cur, rv3 # 1,4 10
#nop
fsmb rv5, rv2 # 1,4 11
#nop
rotqmbyi rv6, $lr, -8 # 1,4 12
#nop
rotqbyi size2, vma, 4 # 1,4 13
#nop
lqd save3, -48($sp) # 1,6 14
#nop; lnop
or rv7, rv4, rv6 # 0,2 16
lqd save2, -32($sp) # 1,6 16
andi present2, size2, 1 # 0,2 17
#ifdef OVLY_IRQ_SAVE
stqd save4, -64($sp) # 1,6 17
#else
lnop # 1,0 17
#endif
selb $lr, rv7, $lr, rv5 # 0,2 18
lqd save1, -16($sp) # 1,6 18
#nop
brz present2, do_load # 1,4 19
ovly_load9:
#nop
bi target # 1,4 20
/* If we get here, we are about to load a new overlay.
* "vma" contains the relevant entry from _ovly_table[].
* extern struct {
* u32 vma;
* u32 size;
* u32 file_offset;
* u32 buf;
* } _ovly_table[];
*/
.align 3
.global __ovly_load_event
.type __ovly_load_event, @function
__ovly_load_event:
do_load:
#ifdef OVLY_IRQ_SAVE
ila irqtmp1, do_load10 # 0,2 -5
rotqbyi sz, vma, 8 # 1,4 -5
#nop
rdch irq_stat, $SPU_RdMachStat # 1,6 -4
#nop
bid irqtmp1 # 1,4 -3
do_load10:
nop
#else
#nop
rotqbyi sz, vma, 8 # 1,4 0
#endif
rotqbyi osize, vma, 4 # 1,4 1
#nop
lqa ea64, _EAR_ # 1,6 2
#nop
lqr cgshuf, __cg_pattern # 1,6 3
/* We could predict the branch at the end of this loop by adding a few
instructions, and there are plenty of free cycles to do so without
impacting loop execution time. However, it doesn't make a great
deal of sense since we need to wait for the dma to complete anyway. */
__ovly_xfer_loop:
#nop
rotqmbyi off64, sz, -4 # 1,4 4
#nop; lnop
#nop; lnop
#nop; lnop
cg cgbits, ea64, off64 # 0,2 8
#lnop
#nop; lnop
#nop
shufb add64, cgbits, cgbits, cgshuf # 1,4 10
#nop; lnop
#nop; lnop
#nop; lnop
addx add64, ea64, off64 # 0,2 14
#lnop
ila maxsize, MFC_MAX_DMA_SIZE # 0,2 15
lnop
ori ea64, add64, 0 # 0,2 16
rotqbyi ealo, add64, 4 # 1,4 16
cgt cmp, osize, maxsize # 0,2 17
wrch $MFC_LSA, vma # 1,6 17
#nop; lnop
selb sz, osize, maxsize, cmp # 0,2 19
wrch $MFC_EAH, ea64 # 1,6 19
ila tagid, MFC_TAG_ID # 0,2 20
wrch $MFC_EAL, ealo # 1,6 20
ila cmd, MFC_GET_CMD # 0,2 21
wrch $MFC_Size, sz # 1,6 21
sf osize, sz, osize # 0,2 22
wrch $MFC_TagId, tagid # 1,6 22
a vma, vma, sz # 0,2 23
wrch $MFC_Cmd, cmd # 1,6 23
#nop
brnz osize, __ovly_xfer_loop # 1,4 24
/* Now update our data structions while waiting for DMA to complete.
Low bit of .size needs to be cleared on the _ovly_table entry
corresponding to the evicted overlay, and set on the entry for the
newly loaded overlay. Note that no overlay may in fact be evicted
as _ovly_buf_table[] starts with all zeros. Don't zap .size entry
for zero index! Also of course update the _ovly_buf_table entry. */
#nop
lqr newovl, __ovly_current # 1,6 25
#nop; lnop
#nop; lnop
#nop; lnop
#nop; lnop
#nop; lnop
shli off3, newovl, 4 # 0,4 31
#lnop
ila tab3, _ovly_table - 16 # 0,2 32
#lnop
#nop
fsmbi pbyte, 0x100 # 1,4 33
#nop; lnop
#nop
lqx vma, tab3, off3 # 1,6 35
#nop; lnop
andi pbit, pbyte, 1 # 0,2 37
lnop
#nop; lnop
#nop; lnop
#nop; lnop
or newvma, vma, pbit # 0,2 41
rotqbyi buf3, vma, 12 # 1,4 41
#nop; lnop
#nop
stqx newvma, tab3, off3 # 1,6 43
#nop; lnop
shli off4, buf3, 2 # 1,4 45
#lnop
ila tab4, _ovly_buf_table - 4 # 0,2 46
#lnop
#nop; lnop
#nop; lnop
#nop
lqx map, tab4, off4 # 1,6 49
#nop
cwx genwi, tab4, off4 # 1,4 50
a addr4, tab4, off4 # 0,2 51
#lnop
#nop; lnop
#nop; lnop
#nop; lnop
#nop
rotqby oldovl, map, addr4 # 1,4 55
#nop
shufb newmap, newovl, map, genwi # 0,4 56
#if MFC_TAG_ID < 16
ila newmask, 1 << MFC_TAG_ID # 0,2 57
#else
ilhu newmask, 1 << (MFC_TAG_ID - 16) # 0,2 57
#endif
#lnop
#nop; lnop
#nop; lnop
stqd newmap, 0(addr4) # 1,6 60
/* Save app's tagmask, wait for DMA complete, restore mask. */
ila tagstat, MFC_TAG_UPDATE_ALL # 0,2 61
rdch oldmask, $MFC_RdTagMask # 1,6 61
#nop
wrch $MFC_WrTagMask, newmask # 1,6 62
#nop
wrch $MFC_WrTagUpdate, tagstat # 1,6 63
#nop
rdch tagstat, $MFC_RdTagStat # 1,6 64
#nop
sync # 1,4 65
/* Any hint prior to the sync is lost. A hint here allows the branch
to complete 15 cycles after the hint. With no hint the branch will
take 18 or 19 cycles. */
ila tab5, _ovly_table - 16 # 0,2 66
hbr do_load99, target # 1,15 66
shli off5, oldovl, 4 # 0,4 67
wrch $MFC_WrTagMask, oldmask # 1,6 67
ceqi zovl, oldovl, 0 # 0,2 68
#lnop
#nop; lnop
#nop
fsm zovl, zovl # 1,4 70
#nop
lqx oldvma, tab5, off5 # 1,6 71
#nop
lqd save3, -48($sp) # 1,6 72
#nop; lnop
andc pbit, pbit, zovl # 0,2 74
lqd save2, -32($sp) # 1,6 74
#ifdef OVLY_IRQ_SAVE
ila irqtmp2, do_load90 # 0,2 75
#lnop
andi irq_stat, irq_stat, 1 # 0,2 76
#lnop
#else
#nop; lnop
#nop; lnop
#endif
andc oldvma, oldvma, pbit # 0,2 77
lqd save1, -16($sp) # 1,6 77
nop # 0,0 78
#lnop
#nop
stqx oldvma, tab5, off5 # 1,6 79
#nop
#ifdef OVLY_IRQ_SAVE
binze irq_stat, irqtmp2 # 1,4 80
do_load90:
#nop
lqd save4, -64($sp) # 1,6 84
#else
#nop; lnop
#endif
.global _ovly_debug_event
.type _ovly_debug_event, @function
_ovly_debug_event:
nop
/* Branch to target address. */
do_load99:
bi target # 1,4 81/85
.size __ovly_load, . - __ovly_load