1 /* This is where the SPARC/LEON3 starts
3 * Daniel Hellstrom, daniel@gaisler.com
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm-offsets.h>
10 #include <asm/asmmacro.h>
11 #include <asm/winmacro.h>
13 #include <asm/stack.h>
17 /* Entry for traps which jump to a programmer-specified trap handler. */
19 wr %g0, 0xfe0, %psr; \
29 #define TRAPI(ilevel) \
35 /* Unexcpected trap will halt the processor by forcing it to error state */
37 #define BAD_TRAP ta 0; nop; nop; nop;
39 /* Software trap. Treat as BAD_TRAP for the time being... */
40 #define SOFT_TRAP TRAP(_hwerr)
42 #define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
45 /* All traps low-level code here must end with this macro. */
46 #define RESTORE_ALL b ret_trap_entry; clr %l6;
48 #define WRITE_PAUSE nop;nop;nop
52 ARGPUSH = (WINDOWSIZE + 4)
53 MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
55 /* Number of register windows */
56 #ifndef CONFIG_SYS_SPARC_NWINDOWS
57 #error Must define number of SPARC register windows, default is 8
61 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
63 .section ".start", "ax"
64 .globl _start, start, _trap_table
65 .globl _irq_entry, nmi_trap
74 TRAPR(_hardreset); ! 00 reset trap
75 BAD_TRAP; ! 01 instruction_access_exception
76 BAD_TRAP; ! 02 illegal_instruction
77 BAD_TRAP; ! 03 priveleged_instruction
78 BAD_TRAP; ! 04 fp_disabled
79 TRAP(_window_overflow); ! 05 window_overflow
80 TRAP(_window_underflow); ! 06 window_underflow
81 BAD_TRAP; ! 07 Memory Address Not Aligned
82 BAD_TRAP; ! 08 Floating Point Exception
83 BAD_TRAP; ! 09 Data Miss Exception
84 BAD_TRAP; ! 0a Tagged Instruction Ovrflw
85 BAD_TRAP; ! 0b Watchpoint Detected
91 TRAPI(1); ! 11 IRQ level 1
92 TRAPI(2); ! 12 IRQ level 2
93 TRAPI(3); ! 13 IRQ level 3
94 TRAPI(4); ! 14 IRQ level 4
95 TRAPI(5); ! 15 IRQ level 5
96 TRAPI(6); ! 16 IRQ level 6
97 TRAPI(7); ! 17 IRQ level 7
98 TRAPI(8); ! 18 IRQ level 8
99 TRAPI(9); ! 19 IRQ level 9
100 TRAPI(10); ! 1a IRQ level 10
101 TRAPI(11); ! 1b IRQ level 11
102 TRAPI(12); ! 1c IRQ level 12
103 TRAPI(13); ! 1d IRQ level 13
104 TRAPI(14); ! 1e IRQ level 14
105 TRAP(_nmi_trap); ! 1f IRQ level 15 /
106 ! NMI (non maskable interrupt)
107 BAD_TRAP; ! 20 r_register_access_error
108 BAD_TRAP; ! 21 instruction access error
111 BAD_TRAP; ! 24 co-processor disabled
112 BAD_TRAP; ! 25 uniplemented FLUSH
115 BAD_TRAP; ! 28 co-processor exception
116 BAD_TRAP; ! 29 data access error
117 BAD_TRAP; ! 2a division by zero
118 BAD_TRAP; ! 2b data store error
119 BAD_TRAP; ! 2c data access MMU miss
123 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 30-33
124 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 34-37
125 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 38-3b
126 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 3c-3f
127 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 40-43
128 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 44-47
129 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 48-4b
130 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 4c-4f
131 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 50-53
132 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 54-57
133 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 58-5b
134 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 5c-5f
136 /* implementaion dependent */
137 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 60-63
138 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 64-67
139 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 68-6b
140 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 6c-6f
141 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 70-73
142 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 74-77
143 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 78-7b
144 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 7c-7f
146 /* Software traps, not handled */
147 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 80-83
148 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84-87
149 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88-8b
150 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8c-8f
151 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90-93
152 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94-97
153 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 98-9b
154 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 9c-9f
155 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a0-a3
156 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a4-a7
157 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a8-ab
158 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ac-af
159 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b0-b3
160 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b4-b7
161 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b8-bb
162 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! bc-bf
163 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c0-c3
164 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c4-c7
165 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c8-cb
166 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! cc-cf
167 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d0-d3
168 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d4-d7
169 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d8-db
170 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! dc-df
171 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e0-e3
172 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e4-e7
173 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e8-eb
174 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ec-ef
175 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f0-f3
176 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7
177 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb
178 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff
184 .globl version_string
186 .ascii U_BOOT_VERSION_STRING, "\0"
199 set (LEON2_PREGS+LEON_REG_CACHECTRL_OFFSET), %g1
236 /* LEON2 Register Base in g1 */
240 /* Set Cache control register */
246 /* Clear LEON2 registers */
247 st %g0, [%g1 + LEON2_ECTRL]
248 st %g0, [%g1 + LEON2_IMASK]
249 st %g0, [%g1 + LEON2_IPEND]
250 st %g0, [%g1 + LEON2_IFORCE]
251 st %g0, [%g1 + LEON2_ICLEAR]
252 st %g0, [%g1 + LEON2_IOREG]
253 st %g0, [%g1 + LEON2_IODIR]
254 st %g0, [%g1 + LEON2_IOICONF]
255 st %g0, [%g1 + LEON2_UCTRL0]
256 st %g0, [%g1 + LEON2_UCTRL1]
259 /* I/O port initialization */
261 st %g2, [%g1 + LEON2_IOREG]
265 /* memory config register 1 */
266 set CONFIG_SYS_GRLIB_MEMCFG1, %g2
270 st %g2, [%g1 + LEON2_MCFG1]
271 set CONFIG_SYS_GRLIB_MEMCFG2, %g2 ! Load memory config register 2
272 #if !( defined(TSIM) || !defined(BZIMAGE))
273 st %g2, [%g1 + LEON2_MCFG2] ! only for prom version, else done by "dumon -i"
275 set CONFIG_SYS_GRLIB_MEMCFG3, %g2 ! Init FT register
276 st %g2, [%g1 + LEON2_ECTRL]
277 ld [%g1 + LEON2_ECTRL], %g2
281 mov %g0, %asr16 ! clear err_reg
296 set CONFIG_SYS_INIT_SP_OFFSET, %fp
304 /* un relocated start address of monitor */
305 #define TEXT_START _text
307 /* un relocated end address of monitor */
308 #define DATA_END __init_end
313 set CONFIG_SYS_RELOC_MONITOR_BASE,%g4
330 /* register g4 contain address to start
331 * This means that BSS must be directly after data and code segments
333 * g3 is length of bss = (__bss_end-__bss_start)
338 /* clear bss area (the relocated) */
343 clr %g1 /* std %g0 uses g0 and g1 */
344 /* clearing 16byte a time ==> linker script need to align to 16 byte offset */
353 /* add offsets to GOT table */
358 * new got offset = (old GOT-PTR (read with ld) -
359 * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) +
360 * Destination Address (from define)
362 set CONFIG_SYS_RELOC_MONITOR_BASE,%g2
368 sub %g2,%g1,%g2 ! prepare register with (new base address) -
371 ld [%g4],%l0 ! load old GOT-PTR
372 add %l0,%g2,%l0 ! increase with (new base address) -
381 set __prom_start, %g2
383 set CONFIG_SYS_PROM_OFFSET, %g4
392 bne prom_relocate_loop
395 /* Trap table has been moved, lets tell CPU about
396 * the new trap table address
399 set CONFIG_SYS_RELOC_MONITOR_BASE, %g2
404 /* Call relocated init functions */
407 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
414 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
420 dead: ta 0 ! if call returns...
423 /* Interrupt handler caller,
424 * reg L7: interrupt number
425 * reg L0: psr after interrupt
438 mov %l7, %o0 ! irq level
440 set (CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o2
443 add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr
444 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
445 wr %g2, PSR_ET, %psr ! keep ET up
450 !Window overflow trap handler.
451 .global _window_overflow
455 mov %wim, %l3 ! Calculate next WIM
458 sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4
461 save ! Get into window to be saved.
482 restore ! Go back to trap window.
484 jmp %l1 ! Re-execute save.
487 /* Window underflow trap handler. */
489 .global _window_underflow
493 mov %wim, %l3 ! Calculate next WIM
495 srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5
499 restore ! Two restores to get into the
500 restore ! window to restore
501 ld [%sp + 0], %l0; ! Restore window from the stack
517 save ! Get back to the trap window.
519 jmp %l1 ! Re-execute restore.
533 b _hwerr ! loop infinite
536 /* Registers to not touch at all. */
537 #define t_psr l0 /* Set by caller */
538 #define t_pc l1 /* Set by caller */
539 #define t_npc l2 /* Set by caller */
540 #define t_wim l3 /* Set by caller */
541 #define t_twinmask l4 /* Set at beginning of this entry routine. */
542 #define t_kstack l5 /* Set right before pt_regs frame is built */
543 #define t_retpc l6 /* If you change this, change winmacro.h header file */
544 #define t_systable l7 /* Never touch this, could be the syscall table ptr. */
545 #define curptr g6 /* Set after pt_regs frame is built */
548 /* build a pt_regs trap frame. */
549 sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
550 PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2)
552 /* See if we are in the trap window. */
554 sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
555 andcc %t_twinmask, %t_wim, %g0
556 beq 1f ! in trap window, clean up
559 /*-------------------------------------------------
560 * Spill , adjust %wim and go.
562 srl %t_wim, 0x1, %g2 ! begin computation of new %wim
564 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
566 sll %t_wim, %g3, %t_wim ! NWINDOWS-1
570 save %g0, %g0, %g0 ! get in window to be saved
572 /* Set new %wim value */
575 /* Save the kernel window onto the corresponding stack. */
578 restore %g0, %g0, %g0
579 /*-------------------------------------------------*/
582 /* Trap from kernel with a window available.
585 jmpl %t_retpc + 0x8, %g0 ! return to caller
586 mov %t_kstack, %sp ! jump onto new stack
592 wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
594 /* Will the rett land us in the invalid window? */
598 set CONFIG_SYS_SPARC_NWINDOWS, %g2 !NWINDOWS
604 be 1f ! Nope, just return from the trap
607 /* We have to grab a window before returning. */
608 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
616 /* Grrr, make sure we load from the right %sp... */
617 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
619 restore %g0, %g0, %g0
624 /* Reload the entire frame in case this is from a
625 * kernel system call or whatever...
628 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
638 /* This is called from relocated C-code.
639 * It resets the system by jumping to _start