srt0.s revision 1.1
1 /* $NetBSD: srt0.s,v 1.1 2000/08/20 14:58:42 mrg 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 /* 40 * Globals 41 */ 42 .globl _esym 43 .data 44 _esym: .word 0 /* end of symbol table */ 45 .globl _C_LABEL(romp) 46 .align 8 47 _C_LABEL(romp): .xword 0 /* openfirmware entry point */ 48 49 /* 50 * Startup entry 51 */ 52 .text 53 .globl _start, _C_LABEL(kernel_text) 54 _C_LABEL(kernel_text) = _start 55 _start: 56 nop ! For some reason this is needed to fixup the text section 57 58 /* 59 * Step 1: Save rom entry pointer -- NOTE this probably needs to change 60 */ 61 62 mov %o4, %g7 ! save prom vector pointer 63 set _C_LABEL(romp), %g1 64 stx %o4, [%g1] ! It's initialized data, I hope 65 66 /* 67 * Start by creating a stack for ourselves. 68 */ 69 #ifdef _LP64 70 /* 64-bit stack */ 71 btst 1, %sp 72 set CC64FSZ, %g1 ! Frame Size (negative) 73 bnz 1f 74 set BIAS, %g2 ! Bias (negative) 75 andn %sp, 0x0f, %sp ! 16 byte align, per ELF spec. 76 add %g1, %g2, %g1 ! Frame + Bias 77 1: 78 sub %sp, %g1, %g1 79 save %g1, %g0, %sp 80 #else 81 /* 32-bit stack */ 82 btst 1, %sp 83 set CC64FSZ, %g1 ! Frame Size (negative) 84 bz 1f 85 set BIAS, %g2 86 sub %g1, %g2, %g1 87 1: 88 sub %sp, %g1, %g1 ! This is so we properly sign-extend things 89 andn %g1, 0x7, %g1 90 save %g1, %g0, %sp 91 #endif 92 93 ! mov %i0, %i4 ! Apparenty we get our CIF in i0 94 95 /* 96 * Set the psr into a known state: 97 * Set supervisor mode, interrupt level >= 13, traps enabled 98 */ 99 wrpr %g0, 0, %pil ! So I lied 100 wrpr %g0, PSTATE_PRIV+PSTATE_IE, %pstate 101 102 clr %g4 ! Point %g4 to start of data segment 103 ! only problem is that apparently the 104 ! start of the data segment is 0 105 106 /* 107 * XXXXXXXX Need to determine what params are passed 108 */ 109 call _C_LABEL(setup) 110 nop 111 mov %i1, %o1 112 call _C_LABEL(main) 113 mov %i2, %o0 114 call _C_LABEL(exit) 115 nop 116 call _C_LABEL(_rtt) 117 nop 118 119 /* 120 * void syncicache(void* start, int size) 121 * 122 * I$ flush. Really simple. Just flush over the whole range. 123 */ 124 .align 8 125 .globl _C_LABEL(syncicache) 126 _C_LABEL(syncicache): 127 dec 4, %o1 128 flush %o0 129 brgz,a,pt %o1, _C_LABEL(syncicache) 130 inc 4, %o0 131 retl 132 nop 133 134 /* 135 * openfirmware(cell* param); 136 * 137 * OpenFirmware entry point 138 * 139 * If we're running in 32-bit mode we need to convert to a 64-bit stack 140 * and 64-bit cells. The cells we'll allocate off the stack for simplicity. 141 */ 142 .align 8 143 .globl _C_LABEL(openfirmware) 144 .proc 1 145 FTYPE(openfirmware) 146 _C_LABEL(openfirmware): 147 andcc %sp, 1, %g0 148 bz,pt %icc, 1f 149 sethi %hi(_C_LABEL(romp)), %o1 150 151 ldx [%o1+%lo(_C_LABEL(romp))], %o4 ! v9 stack, just load the addr and callit 152 save %sp, -CC64FSZ, %sp 153 mov %i0, %o0 ! Copy over our parameter 154 mov %g1, %l1 155 mov %g2, %l2 156 mov %g3, %l3 157 mov %g4, %l4 158 mov %g5, %l5 159 mov %g6, %l6 160 mov %g7, %l7 161 rdpr %pstate, %l0 162 jmpl %i4, %o7 163 wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate 164 wrpr %l0, %g0, %pstate 165 mov %l1, %g1 166 mov %l2, %g2 167 mov %l3, %g3 168 mov %l4, %g4 169 mov %l5, %g5 170 mov %l6, %g6 171 mov %l7, %g7 172 ret 173 restore %o0, %g0, %o0 174 175 1: ! v8 -- need to screw with stack & params 176 save %sp, -CC64FSZ, %sp ! Get a new 64-bit stack frame 177 add %sp, -BIAS, %sp 178 sethi %hi(_C_LABEL(romp)), %o1 179 rdpr %pstate, %l0 180 ldx [%o1+%lo(_C_LABEL(romp))], %o1 ! Do the actual call 181 srl %sp, 0, %sp 182 mov %i0, %o0 183 mov %g1, %l1 184 mov %g2, %l2 185 mov %g3, %l3 186 mov %g4, %l4 187 mov %g5, %l5 188 mov %g6, %l6 189 mov %g7, %l7 190 jmpl %o1, %o7 191 wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate ! Enable 64-bit addresses for the prom 192 wrpr %l0, 0, %pstate 193 mov %l1, %g1 194 mov %l2, %g2 195 mov %l3, %g3 196 mov %l4, %g4 197 mov %l5, %g5 198 mov %l6, %g6 199 mov %l7, %g7 200 ret 201 restore %o0, %g0, %o0 202 203 #if 0 204 .data 205 .align 8 206 bootstack: 207 #define STACK_SIZE 0x14000 208 .skip STACK_SIZE 209 ebootstack: ! end (top) of boot stack 210 #endif 211
Indexes created Thu Oct 02 07:10:07 GMT 2025