srt0.s revision 1.2
1 /* $NetBSD: srt0.s,v 1.2 2002/10/30 01:46:09 petrov Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <machine/psl.h> 35 #include <machine/param.h> 36 #include <machine/frame.h> 37 #include <machine/asm.h> 38 39 .register %g2,#ignore 40 .register %g3,#ignore 41 42 /* 43 * Globals 44 */ 45 .globl _esym 46 .data 47 _esym: .word 0 /* end of symbol table */ 48 .globl _C_LABEL(romp) 49 .align 8 50 _C_LABEL(romp): .xword 0 /* openfirmware entry point */ 51 52 /* 53 * Startup entry 54 */ 55 .text 56 .globl _start, _C_LABEL(kernel_text) 57 _C_LABEL(kernel_text) = _start 58 _start: 59 nop ! For some reason this is needed to fixup the text section 60 61 /* 62 * Step 1: Save rom entry pointer -- NOTE this probably needs to change 63 */ 64 65 mov %o4, %g7 ! save prom vector pointer 66 set _C_LABEL(romp), %g1 67 stx %o4, [%g1] ! It's initialized data, I hope 68 69 /* 70 * Start by creating a stack for ourselves. 71 */ 72 #ifdef _LP64 73 /* 64-bit stack */ 74 btst 1, %sp 75 set CC64FSZ, %g1 ! Frame Size (negative) 76 bnz 1f 77 set BIAS, %g2 ! Bias (negative) 78 andn %sp, 0x0f, %sp ! 16 byte align, per ELF spec. 79 add %g1, %g2, %g1 ! Frame + Bias 80 1: 81 sub %sp, %g1, %g1 82 save %g1, %g0, %sp 83 #else 84 /* 32-bit stack */ 85 btst 1, %sp 86 set CC64FSZ, %g1 ! Frame Size (negative) 87 bz 1f 88 set BIAS, %g2 89 sub %g1, %g2, %g1 90 1: 91 sub %sp, %g1, %g1 ! This is so we properly sign-extend things 92 andn %g1, 0x7, %g1 93 save %g1, %g0, %sp 94 #endif 95 96 ! mov %i0, %i4 ! Apparenty we get our CIF in i0 97 98 /* 99 * Set the psr into a known state: 100 * Set supervisor mode, interrupt level >= 13, traps enabled 101 */ 102 wrpr %g0, 0, %pil ! So I lied 103 wrpr %g0, PSTATE_PRIV+PSTATE_IE, %pstate 104 105 clr %g4 ! Point %g4 to start of data segment 106 ! only problem is that apparently the 107 ! start of the data segment is 0 108 109 /* 110 * XXXXXXXX Need to determine what params are passed 111 */ 112 call _C_LABEL(setup) 113 nop 114 mov %i1, %o1 115 call _C_LABEL(main) 116 mov %i2, %o0 117 call _C_LABEL(exit) 118 nop 119 call _C_LABEL(_rtt) 120 nop 121 122 /* 123 * void syncicache(void* start, int size) 124 * 125 * I$ flush. Really simple. Just flush over the whole range. 126 */ 127 .align 8 128 .globl _C_LABEL(syncicache) 129 _C_LABEL(syncicache): 130 dec 4, %o1 131 flush %o0 132 brgz,a,pt %o1, _C_LABEL(syncicache) 133 inc 4, %o0 134 retl 135 nop 136 137 /* 138 * openfirmware(cell* param); 139 * 140 * OpenFirmware entry point 141 * 142 * If we're running in 32-bit mode we need to convert to a 64-bit stack 143 * and 64-bit cells. The cells we'll allocate off the stack for simplicity. 144 */ 145 .align 8 146 .globl _C_LABEL(openfirmware) 147 .proc 1 148 FTYPE(openfirmware) 149 _C_LABEL(openfirmware): 150 andcc %sp, 1, %g0 151 bz,pt %icc, 1f 152 sethi %hi(_C_LABEL(romp)), %o1 153 154 ldx [%o1+%lo(_C_LABEL(romp))], %o4 ! v9 stack, just load the addr and callit 155 save %sp, -CC64FSZ, %sp 156 mov %i0, %o0 ! Copy over our parameter 157 mov %g1, %l1 158 mov %g2, %l2 159 mov %g3, %l3 160 mov %g4, %l4 161 mov %g5, %l5 162 mov %g6, %l6 163 mov %g7, %l7 164 rdpr %pstate, %l0 165 jmpl %i4, %o7 166 wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate 167 wrpr %l0, %g0, %pstate 168 mov %l1, %g1 169 mov %l2, %g2 170 mov %l3, %g3 171 mov %l4, %g4 172 mov %l5, %g5 173 mov %l6, %g6 174 mov %l7, %g7 175 ret 176 restore %o0, %g0, %o0 177 178 1: ! v8 -- need to screw with stack & params 179 save %sp, -CC64FSZ, %sp ! Get a new 64-bit stack frame 180 add %sp, -BIAS, %sp 181 sethi %hi(_C_LABEL(romp)), %o1 182 rdpr %pstate, %l0 183 ldx [%o1+%lo(_C_LABEL(romp))], %o1 ! Do the actual call 184 srl %sp, 0, %sp 185 mov %i0, %o0 186 mov %g1, %l1 187 mov %g2, %l2 188 mov %g3, %l3 189 mov %g4, %l4 190 mov %g5, %l5 191 mov %g6, %l6 192 mov %g7, %l7 193 jmpl %o1, %o7 194 wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate ! Enable 64-bit addresses for the prom 195 wrpr %l0, 0, %pstate 196 mov %l1, %g1 197 mov %l2, %g2 198 mov %l3, %g3 199 mov %l4, %g4 200 mov %l5, %g5 201 mov %l6, %g6 202 mov %l7, %g7 203 ret 204 restore %o0, %g0, %o0 205 206 #if 0 207 .data 208 .align 8 209 bootstack: 210 #define STACK_SIZE 0x14000 211 .skip STACK_SIZE 212 ebootstack: ! end (top) of boot stack 213 #endif 214
Indexes created Wed Oct 01 18:09:54 GMT 2025