mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
e8a8bab52c
The SPDX tag conversion ate part of this file, put things back to the way they should be. Signed-off-by: Tom Rini <trini@ti.com>
602 lines
14 KiB
ArmAsm
602 lines
14 KiB
ArmAsm
/* 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.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/winmacro.h>
|
|
#include <asm/psr.h>
|
|
#include <asm/stack.h>
|
|
#include <asm/leon.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_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-CONFIG_SYS_TEXT_BASE), %o1
|
|
st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_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-CONFIG_SYS_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
|