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u-boot/cpu/leon3/start.S
Peter Tyser 561858ee7d Update U-Boot's build timestamp on every compile 
Use the GNU 'date' command to auto-generate a new U-Boot
timestamp on every compile.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2008-12-06 23:36:43 +01:00

618 lines
15 KiB
ArmAsm
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/* This is where the SPARC/LEON3 starts
* Copyright (C) 2007,
* Daniel Hellstrom, daniel@gaisler.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <asm/asmmacro.h>
#include <asm/winmacro.h>
#include <asm/psr.h>
#include <asm/stack.h>
#include <asm/leon.h>
#include <timestamp.h>
#include <version.h>
/* Entry for traps which jump to a programmer-specified trap handler. */
#define TRAPR(H) \
wr %g0, 0xfe0, %psr; \
mov %g0, %tbr; \
ba (H); \
mov %g0, %wim;
#define TRAP(H) \
mov %psr, %l0; \
ba (H); \
nop; nop;
#define TRAPI(ilevel) \
mov ilevel, %l7; \
mov %psr, %l0; \
b _irq_entry; \
mov %wim, %l3
/* Unexcpected trap will halt the processor by forcing it to error state */
#undef BAD_TRAP
#define BAD_TRAP ta 0; nop; nop; nop;
/* Software trap. Treat as BAD_TRAP for the time being... */
#define SOFT_TRAP TRAP(_hwerr)
#define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
#define WIM_INIT 2
/* All traps low-level code here must end with this macro. */
#define RESTORE_ALL b ret_trap_entry; clr %l6;
#define WRITE_PAUSE nop;nop;nop
WINDOWSIZE = (16 * 4)
ARGPUSHSIZE = (6 * 4)
ARGPUSH = (WINDOWSIZE + 4)
MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
/* Number of register windows */
#ifndef CONFIG_SYS_SPARC_NWINDOWS
#error Must define number of SPARC register windows, default is 8
#endif
#define STACK_ALIGN 8
#define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
.section ".start", "ax"
.globl _start, start, _trap_table
.globl _irq_entry, nmi_trap
.globl _reset_reloc
/* at address 0
* Hardware traps
*/
start:
_start:
_trap_table:
TRAPR(_hardreset); ! 00 reset trap
BAD_TRAP; ! 01 instruction_access_exception
BAD_TRAP; ! 02 illegal_instruction
BAD_TRAP; ! 03 priveleged_instruction
BAD_TRAP; ! 04 fp_disabled
TRAP(_window_overflow); ! 05 window_overflow
TRAP(_window_underflow); ! 06 window_underflow
BAD_TRAP; ! 07 Memory Address Not Aligned
BAD_TRAP; ! 08 Floating Point Exception
BAD_TRAP; ! 09 Data Miss Exception
BAD_TRAP; ! 0a Tagged Instruction Ovrflw
BAD_TRAP; ! 0b Watchpoint Detected
BAD_TRAP; ! 0c
BAD_TRAP; ! 0d
BAD_TRAP; ! 0e
BAD_TRAP; ! 0f
BAD_TRAP; ! 10
TRAPI(1); ! 11 IRQ level 1
TRAPI(2); ! 12 IRQ level 2
TRAPI(3); ! 13 IRQ level 3
TRAPI(4); ! 14 IRQ level 4
TRAPI(5); ! 15 IRQ level 5
TRAPI(6); ! 16 IRQ level 6
TRAPI(7); ! 17 IRQ level 7
TRAPI(8); ! 18 IRQ level 8
TRAPI(9); ! 19 IRQ level 9
TRAPI(10); ! 1a IRQ level 10
TRAPI(11); ! 1b IRQ level 11
TRAPI(12); ! 1c IRQ level 12
TRAPI(13); ! 1d IRQ level 13
TRAPI(14); ! 1e IRQ level 14
TRAP(_nmi_trap); ! 1f IRQ level 15 /
! NMI (non maskable interrupt)
BAD_TRAP; ! 20 r_register_access_error
BAD_TRAP; ! 21 instruction access error
BAD_TRAP; ! 22
BAD_TRAP; ! 23
BAD_TRAP; ! 24 co-processor disabled
BAD_TRAP; ! 25 uniplemented FLUSH
BAD_TRAP; ! 26
BAD_TRAP; ! 27
BAD_TRAP; ! 28 co-processor exception
BAD_TRAP; ! 29 data access error
BAD_TRAP; ! 2a division by zero
BAD_TRAP; ! 2b data store error
BAD_TRAP; ! 2c data access MMU miss
BAD_TRAP; ! 2d
BAD_TRAP; ! 2e
BAD_TRAP; ! 2f
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 30-33
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 34-37
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 38-3b
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 3c-3f
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 40-43
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 44-47
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 48-4b
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 4c-4f
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 50-53
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 54-57
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 58-5b
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 5c-5f
/* implementaion dependent */
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 60-63
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 64-67
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 68-6b
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 6c-6f
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 70-73
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 74-77
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 78-7b
BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 7c-7f
/* Software traps, not handled */
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 80-83
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84-87
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88-8b
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8c-8f
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90-93
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94-97
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 98-9b
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 9c-9f
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a0-a3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a4-a7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a8-ab
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ac-af
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b0-b3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b4-b7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b8-bb
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! bc-bf
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c0-c3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c4-c7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c8-cb
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! cc-cf
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d0-d3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d4-d7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d8-db
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! dc-df
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e0-e3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e4-e7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e8-eb
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ec-ef
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f0-f3
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb
SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff
/*
* Version string
*/
.data
.extern leon3_snooping_avail
.globl version_string
version_string:
.ascii U_BOOT_VERSION
.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
.ascii CONFIG_IDENT_STRING, "\0"
.section ".text"
.align 4
_hardreset:
1000:
flush
/* Enable I/D-Cache and Snooping */
set 0x0081000f, %g2
sta %g2, [%g0] 2
mov %g0, %y
clr %g1
clr %g2
clr %g3
clr %g4
clr %g5
clr %g6
clr %g7
mov %asr17, %g3
and %g3, 0x1f, %g3
clear_window:
mov %g0, %l0
mov %g0, %l1
mov %g0, %l2
mov %g0, %l3
mov %g0, %l4
mov %g0, %l5
mov %g0, %l6
mov %g0, %l7
mov %g0, %o0
mov %g0, %o1
mov %g0, %o2
mov %g0, %o3
mov %g0, %o4
mov %g0, %o5
mov %g0, %o6
mov %g0, %o7
subcc %g3, 1, %g3
bge clear_window
save
wininit:
set WIM_INIT, %g3
mov %g3, %wim
stackp:
set CONFIG_SYS_INIT_SP_OFFSET, %fp
andn %fp, 0x0f, %fp
sub %fp, 64, %sp
cpu_init_unreloc:
call cpu_init_f
nop
/* un relocated start address of monitor */
#define TEXT_START _text
/* un relocated end address of monitor */
#define DATA_END __init_end
reloc:
set TEXT_START,%g2
set DATA_END,%g3
set CONFIG_SYS_RELOC_MONITOR_BASE,%g4
reloc_loop:
ldd [%g2],%l0
ldd [%g2+8],%l2
std %l0,[%g4]
std %l2,[%g4+8]
inc 16,%g2
subcc %g3,%g2,%g0
bne reloc_loop
inc 16,%g4
clr %l0
clr %l1
clr %l2
clr %l3
clr %g2
/* register g4 contain address to start
* This means that BSS must be directly after data and code segments
*
* g3 is length of bss = (__bss_end-__bss_start)
*
*/
clr_bss:
/* clear bss area (the relocated) */
set __bss_start,%g2
set __bss_end,%g3
sub %g3,%g2,%g3
add %g3,%g4,%g3
clr %g1 /* std %g0 uses g0 and g1 */
/* clearing 16byte a time ==> linker script need to align to 16 byte offset */
clr_bss_16:
std %g0,[%g4]
std %g0,[%g4+8]
inc 16,%g4
cmp %g3,%g4
bne clr_bss_16
nop
/* add offsets to GOT table */
fixup_got:
set __got_start,%g4
set __got_end,%g3
/*
* new got offset = (old GOT-PTR (read with ld) -
* CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) +
* Destination Address (from define)
*/
set CONFIG_SYS_RELOC_MONITOR_BASE,%g2
set TEXT_START, %g1
add %g4,%g2,%g4
sub %g4,%g1,%g4
add %g3,%g2,%g3
sub %g3,%g1,%g3
sub %g2,%g1,%g2 ! prepare register with (new base address) -
! (old base address)
got_loop:
ld [%g4],%l0 ! load old GOT-PTR
add %l0,%g2,%l0 ! increase with (new base address) -
! (old base)
st %l0,[%g4]
inc 4,%g4
cmp %g3,%g4
bne got_loop
nop
prom_relocate:
set __prom_start, %g2
set __prom_end, %g3
set CONFIG_SYS_PROM_OFFSET, %g4
prom_relocate_loop:
ldd [%g2],%l0
ldd [%g2+8],%l2
std %l0,[%g4]
std %l2,[%g4+8]
inc 16,%g2
subcc %g3,%g2,%g0
bne prom_relocate_loop
inc 16,%g4
/* Trap table has been moved, lets tell CPU about
* the new trap table address
*/
set CONFIG_SYS_RELOC_MONITOR_BASE, %g2
wr %g0, %g2, %tbr
nop
nop
nop
/* If CACHE snooping is available in hardware the
* variable leon3_snooping_avail will be set to
* 0x800000 else 0.
*/
snoop_detect:
sethi %hi(0x00800000), %o0
lda [%g0] 2, %o1
and %o0, %o1, %o0
sethi %hi(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o1
st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE)+%o1]
/* call relocate*/
nop
/* Call relocated init functions */
jump:
set cpu_init_f2,%o1
set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
add %o1,%o2,%o1
sub %o1,%g1,%o1
call %o1
clr %o0
set board_init_f,%o1
set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
add %o1,%o2,%o1
sub %o1,%g1,%o1
call %o1
clr %o0
dead: ta 0 ! if call returns...
nop
/* Interrupt handler caller,
* reg L7: interrupt number
* reg L0: psr after interrupt
* reg L1: PC
* reg L2: next PC
* reg L3: wim
*/
_irq_entry:
SAVE_ALL
or %l0, PSR_PIL, %g2
wr %g2, 0x0, %psr
WRITE_PAUSE
wr %g2, PSR_ET, %psr
WRITE_PAUSE
mov %l7, %o0 ! irq level
set handler_irq, %o1
set (CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o2
add %o1, %o2, %o1
call %o1
add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr
or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
wr %g2, PSR_ET, %psr ! keep ET up
WRITE_PAUSE
RESTORE_ALL
!Window overflow trap handler.
.global _window_overflow
_window_overflow:
mov %wim, %l3 ! Calculate next WIM
mov %g1, %l7
srl %l3, 1, %g1
sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4
or %l4, %g1, %g1
save ! Get into window to be saved.
mov %g1, %wim
nop;
nop;
nop
st %l0, [%sp + 0];
st %l1, [%sp + 4];
st %l2, [%sp + 8];
st %l3, [%sp + 12];
st %l4, [%sp + 16];
st %l5, [%sp + 20];
st %l6, [%sp + 24];
st %l7, [%sp + 28];
st %i0, [%sp + 32];
st %i1, [%sp + 36];
st %i2, [%sp + 40];
st %i3, [%sp + 44];
st %i4, [%sp + 48];
st %i5, [%sp + 52];
st %i6, [%sp + 56];
st %i7, [%sp + 60];
restore ! Go back to trap window.
mov %l7, %g1
jmp %l1 ! Re-execute save.
rett %l2
/* Window underflow trap handler. */
.global _window_underflow
_window_underflow:
mov %wim, %l3 ! Calculate next WIM
sll %l3, 1, %l4
srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5
or %l5, %l4, %l5
mov %l5, %wim
nop; nop; nop
restore ! Two restores to get into the
restore ! window to restore
ld [%sp + 0], %l0; ! Restore window from the stack
ld [%sp + 4], %l1;
ld [%sp + 8], %l2;
ld [%sp + 12], %l3;
ld [%sp + 16], %l4;
ld [%sp + 20], %l5;
ld [%sp + 24], %l6;
ld [%sp + 28], %l7;
ld [%sp + 32], %i0;
ld [%sp + 36], %i1;
ld [%sp + 40], %i2;
ld [%sp + 44], %i3;
ld [%sp + 48], %i4;
ld [%sp + 52], %i5;
ld [%sp + 56], %i6;
ld [%sp + 60], %i7;
save ! Get back to the trap window.
save
jmp %l1 ! Re-execute restore.
rett %l2
retl
_nmi_trap:
nop
jmp %l1
rett %l2
_hwerr:
ta 0
nop
nop
b _hwerr ! loop infinite
nop
/* Registers to not touch at all. */
#define t_psr l0 /* Set by caller */
#define t_pc l1 /* Set by caller */
#define t_npc l2 /* Set by caller */
#define t_wim l3 /* Set by caller */
#define t_twinmask l4 /* Set at beginning of this entry routine. */
#define t_kstack l5 /* Set right before pt_regs frame is built */
#define t_retpc l6 /* If you change this, change winmacro.h header file */
#define t_systable l7 /* Never touch this, could be the syscall table ptr. */
#define curptr g6 /* Set after pt_regs frame is built */
trap_setup:
/* build a pt_regs trap frame. */
sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2)
/* See if we are in the trap window. */
mov 1, %t_twinmask
sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
andcc %t_twinmask, %t_wim, %g0
beq 1f ! in trap window, clean up
nop
/*-------------------------------------------------
* Spill , adjust %wim and go.
*/
srl %t_wim, 0x1, %g2 ! begin computation of new %wim
set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
sll %t_wim, %g3, %t_wim ! NWINDOWS-1
or %t_wim, %g2, %g2
and %g2, 0xff, %g2
save %g0, %g0, %g0 ! get in window to be saved
/* Set new %wim value */
wr %g2, 0x0, %wim
/* Save the kernel window onto the corresponding stack. */
RW_STORE(sp)
restore %g0, %g0, %g0
/*-------------------------------------------------*/
1:
/* Trap from kernel with a window available.
* Just do it...
*/
jmpl %t_retpc + 0x8, %g0 ! return to caller
mov %t_kstack, %sp ! jump onto new stack
#define twin_tmp1 l4
#define glob_tmp g4
#define curptr g6
ret_trap_entry:
wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
/* Will the rett land us in the invalid window? */
mov 2, %g1
sll %g1, %t_psr, %g1
set CONFIG_SYS_SPARC_NWINDOWS, %g2 !NWINDOWS
srl %g1, %g2, %g2
or %g1, %g2, %g1
rd %wim, %g2
andcc %g2, %g1, %g0
be 1f ! Nope, just return from the trap
sll %g2, 0x1, %g1
/* We have to grab a window before returning. */
set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
srl %g2, %g3, %g2
or %g1, %g2, %g1
and %g1, 0xff, %g1
wr %g1, 0x0, %wim
/* Grrr, make sure we load from the right %sp... */
PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
restore %g0, %g0, %g0
RW_LOAD(sp)
b 2f
save %g0, %g0, %g0
/* Reload the entire frame in case this is from a
* kernel system call or whatever...
*/
1:
PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
2:
wr %t_psr, 0x0, %psr
nop;
nop;
nop
jmp %t_pc
rett %t_npc
/* This is called from relocated C-code.
* It resets the system by jumping to _start
*/
_reset_reloc:
set start, %l0
call %l0
nop
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