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 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm-offsets.h>
13 #include <asm/asmmacro.h>
14 #include <asm/winmacro.h>
16 #include <asm/stack.h>
20 /* Entry for traps which jump to a programmer-specified trap handler. */
22 wr %g0, 0xfe0, %psr; \
32 #define TRAPI(ilevel) \
38 /* Unexcpected trap will halt the processor by forcing it to error state */
40 #define BAD_TRAP ta 0; nop; nop; nop;
42 /* Software trap. Treat as BAD_TRAP for the time being... */
43 #define SOFT_TRAP TRAP(_hwerr)
45 #define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
48 /* All traps low-level code here must end with this macro. */
49 #define RESTORE_ALL b ret_trap_entry; clr %l6;
51 #define WRITE_PAUSE nop;nop;nop
55 ARGPUSH = (WINDOWSIZE + 4)
56 MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
58 /* Number of register windows */
59 #ifndef CONFIG_SYS_SPARC_NWINDOWS
60 #error Must define number of SPARC register windows, default is 8
64 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
66 .section ".start", "ax"
67 .globl _start, start, _trap_table
68 .globl _irq_entry, nmi_trap
77 TRAPR(_hardreset); ! 00 reset trap
78 BAD_TRAP; ! 01 instruction_access_exception
79 BAD_TRAP; ! 02 illegal_instruction
80 BAD_TRAP; ! 03 priveleged_instruction
81 BAD_TRAP; ! 04 fp_disabled
82 TRAP(_window_overflow); ! 05 window_overflow
83 TRAP(_window_underflow); ! 06 window_underflow
84 BAD_TRAP; ! 07 Memory Address Not Aligned
85 BAD_TRAP; ! 08 Floating Point Exception
86 BAD_TRAP; ! 09 Data Miss Exception
87 BAD_TRAP; ! 0a Tagged Instruction Ovrflw
88 BAD_TRAP; ! 0b Watchpoint Detected
94 TRAPI(1); ! 11 IRQ level 1
95 TRAPI(2); ! 12 IRQ level 2
96 TRAPI(3); ! 13 IRQ level 3
97 TRAPI(4); ! 14 IRQ level 4
98 TRAPI(5); ! 15 IRQ level 5
99 TRAPI(6); ! 16 IRQ level 6
100 TRAPI(7); ! 17 IRQ level 7
101 TRAPI(8); ! 18 IRQ level 8
102 TRAPI(9); ! 19 IRQ level 9
103 TRAPI(10); ! 1a IRQ level 10
104 TRAPI(11); ! 1b IRQ level 11
105 TRAPI(12); ! 1c IRQ level 12
106 TRAPI(13); ! 1d IRQ level 13
107 TRAPI(14); ! 1e IRQ level 14
108 TRAP(_nmi_trap); ! 1f IRQ level 15 /
109 ! NMI (non maskable interrupt)
110 BAD_TRAP; ! 20 r_register_access_error
111 BAD_TRAP; ! 21 instruction access error
114 BAD_TRAP; ! 24 co-processor disabled
115 BAD_TRAP; ! 25 uniplemented FLUSH
118 BAD_TRAP; ! 28 co-processor exception
119 BAD_TRAP; ! 29 data access error
120 BAD_TRAP; ! 2a division by zero
121 BAD_TRAP; ! 2b data store error
122 BAD_TRAP; ! 2c data access MMU miss
126 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 30-33
127 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 34-37
128 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 38-3b
129 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 3c-3f
130 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 40-43
131 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 44-47
132 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 48-4b
133 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 4c-4f
134 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 50-53
135 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 54-57
136 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 58-5b
137 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 5c-5f
139 /* implementaion dependent */
140 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 60-63
141 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 64-67
142 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 68-6b
143 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 6c-6f
144 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 70-73
145 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 74-77
146 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 78-7b
147 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 7c-7f
149 /* Software traps, not handled */
150 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 80-83
151 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84-87
152 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88-8b
153 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8c-8f
154 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90-93
155 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94-97
156 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 98-9b
157 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 9c-9f
158 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a0-a3
159 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a4-a7
160 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a8-ab
161 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ac-af
162 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b0-b3
163 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b4-b7
164 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b8-bb
165 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! bc-bf
166 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c0-c3
167 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c4-c7
168 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c8-cb
169 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! cc-cf
170 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d0-d3
171 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d4-d7
172 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d8-db
173 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! dc-df
174 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e0-e3
175 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e4-e7
176 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e8-eb
177 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ec-ef
178 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f0-f3
179 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7
180 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb
181 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff
187 .extern leon3_snooping_avail
188 .globl version_string
190 .ascii U_BOOT_VERSION_STRING, "\0"
199 /* Enable I/D-Cache and Snooping */
240 set CONFIG_SYS_INIT_SP_OFFSET, %fp
248 /* un relocated start address of monitor */
249 #define TEXT_START _text
251 /* un relocated end address of monitor */
252 #define DATA_END __init_end
257 set CONFIG_SYS_RELOC_MONITOR_BASE,%g4
274 /* register g4 contain address to start
275 * This means that BSS must be directly after data and code segments
277 * g3 is length of bss = (__bss_end-__bss_start)
282 /* clear bss area (the relocated) */
287 clr %g1 /* std %g0 uses g0 and g1 */
288 /* clearing 16byte a time ==> linker script need to align to 16 byte offset */
297 /* add offsets to GOT table */
302 * new got offset = (old GOT-PTR (read with ld) -
303 * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) +
304 * Destination Address (from define)
306 set CONFIG_SYS_RELOC_MONITOR_BASE,%g2
312 sub %g2,%g1,%g2 ! prepare register with (new base address) -
315 ld [%g4],%l0 ! load old GOT-PTR
316 add %l0,%g2,%l0 ! increase with (new base address) -
325 set __prom_start, %g2
327 set CONFIG_SYS_PROM_OFFSET, %g4
336 bne prom_relocate_loop
339 /* Trap table has been moved, lets tell CPU about
340 * the new trap table address
343 set CONFIG_SYS_RELOC_MONITOR_BASE, %g2
349 /* If CACHE snooping is available in hardware the
350 * variable leon3_snooping_avail will be set to
354 sethi %hi(0x00800000), %o0
357 sethi %hi(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o1
358 st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE)+%o1]
362 /* Call relocated init functions */
365 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
372 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
378 dead: ta 0 ! if call returns...
381 /* Interrupt handler caller,
382 * reg L7: interrupt number
383 * reg L0: psr after interrupt
396 mov %l7, %o0 ! irq level
398 set (CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o2
401 add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr
402 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
403 wr %g2, PSR_ET, %psr ! keep ET up
408 !Window overflow trap handler.
409 .global _window_overflow
413 mov %wim, %l3 ! Calculate next WIM
416 sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4
419 save ! Get into window to be saved.
440 restore ! Go back to trap window.
442 jmp %l1 ! Re-execute save.
445 /* Window underflow trap handler. */
447 .global _window_underflow
451 mov %wim, %l3 ! Calculate next WIM
453 srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5
457 restore ! Two restores to get into the
458 restore ! window to restore
459 ld [%sp + 0], %l0; ! Restore window from the stack
475 save ! Get back to the trap window.
477 jmp %l1 ! Re-execute restore.
491 b _hwerr ! loop infinite
494 /* Registers to not touch at all. */
495 #define t_psr l0 /* Set by caller */
496 #define t_pc l1 /* Set by caller */
497 #define t_npc l2 /* Set by caller */
498 #define t_wim l3 /* Set by caller */
499 #define t_twinmask l4 /* Set at beginning of this entry routine. */
500 #define t_kstack l5 /* Set right before pt_regs frame is built */
501 #define t_retpc l6 /* If you change this, change winmacro.h header file */
502 #define t_systable l7 /* Never touch this, could be the syscall table ptr. */
503 #define curptr g6 /* Set after pt_regs frame is built */
506 /* build a pt_regs trap frame. */
507 sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
508 PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2)
510 /* See if we are in the trap window. */
512 sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
513 andcc %t_twinmask, %t_wim, %g0
514 beq 1f ! in trap window, clean up
517 /*-------------------------------------------------
518 * Spill , adjust %wim and go.
520 srl %t_wim, 0x1, %g2 ! begin computation of new %wim
522 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
524 sll %t_wim, %g3, %t_wim ! NWINDOWS-1
528 save %g0, %g0, %g0 ! get in window to be saved
530 /* Set new %wim value */
533 /* Save the kernel window onto the corresponding stack. */
536 restore %g0, %g0, %g0
537 /*-------------------------------------------------*/
540 /* Trap from kernel with a window available.
543 jmpl %t_retpc + 0x8, %g0 ! return to caller
544 mov %t_kstack, %sp ! jump onto new stack
550 wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
552 /* Will the rett land us in the invalid window? */
556 set CONFIG_SYS_SPARC_NWINDOWS, %g2 !NWINDOWS
562 be 1f ! Nope, just return from the trap
565 /* We have to grab a window before returning. */
566 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
574 /* Grrr, make sure we load from the right %sp... */
575 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
577 restore %g0, %g0, %g0
582 /* Reload the entire frame in case this is from a
583 * kernel system call or whatever...
586 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
596 /* This is called from relocated C-code.
597 * It resets the system by jumping to _start