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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
generated by cgit v1.1 at 2024-12-19 10:17:29 +0000