| /* |
| * Copyright (c) 2011 Aeroflex Gaisler |
| * |
| * BSD license: |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| |
| /* The traptable has to be the first code in a boot PROM. */ |
| |
| #include <asm-leon/head.h> |
| |
| #define TRAP(H) mov %psr, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; |
| #define TRAPL(H) nop; sethi %hi(H), %g1; jmp %g1+%lo(H); nop; |
| #define TRAP_ENTRY(H) rd %psr, %l0; b H; rd %wim, %l3; nop; |
| |
| #define WIM_INIT 2 |
| #ifdef _SOFT_FLOAT |
| #define PSR_INIT 0x0e0 |
| #else |
| #define PSR_INIT 0x10e0 |
| #endif |
| |
| #define NUMREGWINDOWS 8 |
| |
| /* Unexcpected trap will halt the processor by forcing it to error state */ |
| #define BAD_TRAP ta 0; nop; nop; nop; |
| |
| /* Software trap. Treat as BAD_TRAP */ |
| #define SOFT_TRAP BAD_TRAP |
| |
| .seg "text" |
| .global _trap_table, start, _start, cpuinit, leonbare_irq_entry, _hardreset |
| .global _window_overflow, _window_underflow, _flush_windows, _fpdis_enable |
| /*.global _nwindows, _leon_version, _nwindows_min1*/ |
| |
| |
| ! |
| ! Startup code for standalone system. Wash IU and FPU (if present) registers. |
| ! The registers have to be written to initiate the parity bits. |
| ! |
| .section .text |
| /* ------- */ |
| .weak _hardreset |
| .set _hardreset,_hardreset_libgloss |
| /* ------- */ |
| |
| .global _hardreset_custom_weak, _hardreset_real, _cleanregs_custom_weak, _hardreset_custom_svt_weak |
| |
| _hardreset_real: |
| nop |
| _hardreset_libgloss: |
| set _hardreset_custom_weak, %g1 ! possible mkprom init code here, default links to dummy _hardreset_custom_dummy |
| call %g1 |
| nop |
| |
| set _trap_table, %g1 ! Initialize TBR |
| mov %g1, %tbr |
| |
| set _hardreset_custom_svt_weak, %g1 ! give mkprom svt chance to reset tbr |
| call %g1 |
| nop |
| |
| set _cleanregs_custom_weak, %g1 |
| call %g1 |
| nop |
| |
| #ifdef _FLAT |
| mov %g0, %wim |
| #else |
| /* ! assume that %sp is correct use cwp of psr to set the next window as invalid |
| mov %psr, %g2 ! extract cwp |
| and 0x1f, %g2,%g2 |
| set 0x1, %g3 |
| sll %g3,%g2,%g3 ! the bit mask for cwp |
| |
| sll %g3, 1, %g4 ! rotate one to left |
| sethi %hi(_nwindows_min1), %g5 ! NWINDOWS-1 |
| ld [%g5+%lo(_nwindows_min1)], %g5 |
| srl %g3, %g5, %g5 |
| or %g5, %g4, %g5 |
| mov %g5, %wim |
| nop; nop; nop */ |
| #endif |
| |
| /* |
| mov %psr, %g2 |
| set 0x202, %g3 |
| sll %g3, %g2, %g2 |
| mov %g2, %wim |
| nop; nop; nop |
| 1: |
| */ |
| ! ------------------------------- |
| ! only cpu 0 initializes |
| /* mov %psr, %g5 |
| srl %g5, 24, %g5 |
| and %g5, 3, %g5 |
| subcc %g5, 3, %g0 ! leon2: 0 or 2, leon3: 3 |
| bne callcpuinit |
| nop |
| */ |
| |
| rd %asr17,%g5 |
| srl %g5,28,%g5 |
| cmp %g5,%g0 |
| bne slavego |
| nop |
| |
| callcpuinit: |
| call cpuinit |
| nop |
| |
| call pnpinit |
| nop |
| |
| slavego: |
| ! ------------------------------- |
| |
| sub %sp, 0x40, %sp ! room for main to save args |
| call _start |
| nop |
| |
| mov 1, %g1 |
| ta 0 ! Halt if _main would return ... |
| nop |
| |
| .global _fpdis,_fpdis_svt |
| _fpdis_svt: |
| _fpdis: |
| set 0x1000, %l4 |
| andcc %l0, %l4, %l3 |
| bne,a 4f |
| andn %l0, %l4, %l0 |
| ta 0 |
| 4: |
| mov %l0, %psr ! restore %psr |
| nop; nop; nop |
| jmp %l2 ! Jump to nPC |
| rett %l2 + 4 |
| |
| |
| /* |
| !'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' |
| .section .bss |
| .global _nwindows, _leon_version, _nwindows_min1 |
| _nwindows: |
| .word 8 |
| _nwindows_min1: |
| .word 7 |
| _leon_version: |
| .word 3 |
| */ |