1 /* This is where the SPARC/LEON3 starts
3 * Daniel Hellstrom, daniel@gaisler.com
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/asmmacro.h>
26 #include <asm/winmacro.h>
28 #include <asm/stack.h>
30 #include <timestamp.h>
33 /* Entry for traps which jump to a programmer-specified trap handler. */
35 wr %g0, 0xfe0, %psr; \
45 #define TRAPI(ilevel) \
51 /* Unexcpected trap will halt the processor by forcing it to error state */
53 #define BAD_TRAP ta 0; nop; nop; nop;
55 /* Software trap. Treat as BAD_TRAP for the time being... */
56 #define SOFT_TRAP TRAP(_hwerr)
58 #define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
61 /* All traps low-level code here must end with this macro. */
62 #define RESTORE_ALL b ret_trap_entry; clr %l6;
64 #define WRITE_PAUSE nop;nop;nop
68 ARGPUSH = (WINDOWSIZE + 4)
69 MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
71 /* Number of register windows */
72 #ifndef CONFIG_SYS_SPARC_NWINDOWS
73 #error Must define number of SPARC register windows, default is 8
77 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
79 .section ".start", "ax"
80 .globl _start, start, _trap_table
81 .globl _irq_entry, nmi_trap
90 TRAPR(_hardreset); ! 00 reset trap
91 BAD_TRAP; ! 01 instruction_access_exception
92 BAD_TRAP; ! 02 illegal_instruction
93 BAD_TRAP; ! 03 priveleged_instruction
94 BAD_TRAP; ! 04 fp_disabled
95 TRAP(_window_overflow); ! 05 window_overflow
96 TRAP(_window_underflow); ! 06 window_underflow
97 BAD_TRAP; ! 07 Memory Address Not Aligned
98 BAD_TRAP; ! 08 Floating Point Exception
99 BAD_TRAP; ! 09 Data Miss Exception
100 BAD_TRAP; ! 0a Tagged Instruction Ovrflw
101 BAD_TRAP; ! 0b Watchpoint Detected
107 TRAPI(1); ! 11 IRQ level 1
108 TRAPI(2); ! 12 IRQ level 2
109 TRAPI(3); ! 13 IRQ level 3
110 TRAPI(4); ! 14 IRQ level 4
111 TRAPI(5); ! 15 IRQ level 5
112 TRAPI(6); ! 16 IRQ level 6
113 TRAPI(7); ! 17 IRQ level 7
114 TRAPI(8); ! 18 IRQ level 8
115 TRAPI(9); ! 19 IRQ level 9
116 TRAPI(10); ! 1a IRQ level 10
117 TRAPI(11); ! 1b IRQ level 11
118 TRAPI(12); ! 1c IRQ level 12
119 TRAPI(13); ! 1d IRQ level 13
120 TRAPI(14); ! 1e IRQ level 14
121 TRAP(_nmi_trap); ! 1f IRQ level 15 /
122 ! NMI (non maskable interrupt)
123 BAD_TRAP; ! 20 r_register_access_error
124 BAD_TRAP; ! 21 instruction access error
127 BAD_TRAP; ! 24 co-processor disabled
128 BAD_TRAP; ! 25 uniplemented FLUSH
131 BAD_TRAP; ! 28 co-processor exception
132 BAD_TRAP; ! 29 data access error
133 BAD_TRAP; ! 2a division by zero
134 BAD_TRAP; ! 2b data store error
135 BAD_TRAP; ! 2c data access MMU miss
139 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 30-33
140 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 34-37
141 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 38-3b
142 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 3c-3f
143 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 40-43
144 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 44-47
145 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 48-4b
146 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 4c-4f
147 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 50-53
148 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 54-57
149 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 58-5b
150 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 5c-5f
152 /* implementaion dependent */
153 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 60-63
154 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 64-67
155 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 68-6b
156 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 6c-6f
157 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 70-73
158 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 74-77
159 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 78-7b
160 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 7c-7f
162 /* Software traps, not handled */
163 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 80-83
164 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84-87
165 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88-8b
166 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8c-8f
167 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90-93
168 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94-97
169 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 98-9b
170 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 9c-9f
171 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a0-a3
172 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a4-a7
173 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a8-ab
174 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ac-af
175 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b0-b3
176 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b4-b7
177 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b8-bb
178 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! bc-bf
179 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c0-c3
180 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c4-c7
181 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c8-cb
182 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! cc-cf
183 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d0-d3
184 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d4-d7
185 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d8-db
186 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! dc-df
187 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e0-e3
188 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e4-e7
189 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e8-eb
190 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ec-ef
191 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f0-f3
192 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7
193 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb
194 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff
200 .extern leon3_snooping_avail
201 .globl version_string
203 .ascii U_BOOT_VERSION
204 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
205 .ascii CONFIG_IDENT_STRING, "\0"
214 /* Enable I/D-Cache and Snooping */
255 set CONFIG_SYS_INIT_SP_OFFSET, %fp
263 /* un relocated start address of monitor */
264 #define TEXT_START _text
266 /* un relocated end address of monitor */
267 #define DATA_END __init_end
272 set CONFIG_SYS_RELOC_MONITOR_BASE,%g4
289 /* register g4 contain address to start
290 * This means that BSS must be directly after data and code segments
292 * g3 is length of bss = (__bss_end-__bss_start)
297 /* clear bss area (the relocated) */
302 clr %g1 /* std %g0 uses g0 and g1 */
303 /* clearing 16byte a time ==> linker script need to align to 16 byte offset */
312 /* add offsets to GOT table */
317 * new got offset = (old GOT-PTR (read with ld) -
318 * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) +
319 * Destination Address (from define)
321 set CONFIG_SYS_RELOC_MONITOR_BASE,%g2
327 sub %g2,%g1,%g2 ! prepare register with (new base address) -
330 ld [%g4],%l0 ! load old GOT-PTR
331 add %l0,%g2,%l0 ! increase with (new base address) -
340 set __prom_start, %g2
342 set CONFIG_SYS_PROM_OFFSET, %g4
351 bne prom_relocate_loop
354 /* Trap table has been moved, lets tell CPU about
355 * the new trap table address
358 set CONFIG_SYS_RELOC_MONITOR_BASE, %g2
364 /* If CACHE snooping is available in hardware the
365 * variable leon3_snooping_avail will be set to
369 sethi %hi(0x00800000), %o0
372 sethi %hi(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o1
373 st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE)+%o1]
377 /* Call relocated init functions */
380 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
387 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
393 dead: ta 0 ! if call returns...
396 /* Interrupt handler caller,
397 * reg L7: interrupt number
398 * reg L0: psr after interrupt
411 mov %l7, %o0 ! irq level
413 set (CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o2
416 add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr
417 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
418 wr %g2, PSR_ET, %psr ! keep ET up
423 !Window overflow trap handler.
424 .global _window_overflow
428 mov %wim, %l3 ! Calculate next WIM
431 sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4
434 save ! Get into window to be saved.
455 restore ! Go back to trap window.
457 jmp %l1 ! Re-execute save.
460 /* Window underflow trap handler. */
462 .global _window_underflow
466 mov %wim, %l3 ! Calculate next WIM
468 srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5
472 restore ! Two restores to get into the
473 restore ! window to restore
474 ld [%sp + 0], %l0; ! Restore window from the stack
490 save ! Get back to the trap window.
492 jmp %l1 ! Re-execute restore.
506 b _hwerr ! loop infinite
509 /* Registers to not touch at all. */
510 #define t_psr l0 /* Set by caller */
511 #define t_pc l1 /* Set by caller */
512 #define t_npc l2 /* Set by caller */
513 #define t_wim l3 /* Set by caller */
514 #define t_twinmask l4 /* Set at beginning of this entry routine. */
515 #define t_kstack l5 /* Set right before pt_regs frame is built */
516 #define t_retpc l6 /* If you change this, change winmacro.h header file */
517 #define t_systable l7 /* Never touch this, could be the syscall table ptr. */
518 #define curptr g6 /* Set after pt_regs frame is built */
521 /* build a pt_regs trap frame. */
522 sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
523 PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2)
525 /* See if we are in the trap window. */
527 sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
528 andcc %t_twinmask, %t_wim, %g0
529 beq 1f ! in trap window, clean up
532 /*-------------------------------------------------
533 * Spill , adjust %wim and go.
535 srl %t_wim, 0x1, %g2 ! begin computation of new %wim
537 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
539 sll %t_wim, %g3, %t_wim ! NWINDOWS-1
543 save %g0, %g0, %g0 ! get in window to be saved
545 /* Set new %wim value */
548 /* Save the kernel window onto the corresponding stack. */
551 restore %g0, %g0, %g0
552 /*-------------------------------------------------*/
555 /* Trap from kernel with a window available.
558 jmpl %t_retpc + 0x8, %g0 ! return to caller
559 mov %t_kstack, %sp ! jump onto new stack
565 wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
567 /* Will the rett land us in the invalid window? */
571 set CONFIG_SYS_SPARC_NWINDOWS, %g2 !NWINDOWS
577 be 1f ! Nope, just return from the trap
580 /* We have to grab a window before returning. */
581 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
589 /* Grrr, make sure we load from the right %sp... */
590 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
592 restore %g0, %g0, %g0
597 /* Reload the entire frame in case this is from a
598 * kernel system call or whatever...
601 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
611 /* This is called from relocated C-code.
612 * It resets the system by jumping to _start