Annotation of sys/arch/sparc64/stand/ofwboot/srt0.s, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: srt0.s,v 1.6 2006/07/09 19:36:57 miod Exp $ */
! 2: /* $NetBSD: srt0.s,v 1.1 2000/08/20 14:58:42 mrg Exp $ */
! 3:
! 4: /*
! 5: * Copyright (C) 1995, 1996 Wolfgang Solfrank.
! 6: * Copyright (C) 1995, 1996 TooLs GmbH.
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This product includes software developed by TooLs GmbH.
! 20: * 4. The name of TooLs GmbH may not be used to endorse or promote products
! 21: * derived from this software without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
! 24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
! 27: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
! 28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
! 29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
! 30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
! 31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
! 32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: */
! 34:
! 35: #include <machine/psl.h>
! 36: #include <machine/param.h>
! 37: #include <machine/frame.h>
! 38: #include <machine/asm.h>
! 39:
! 40: /*
! 41: * Globals
! 42: */
! 43: .globl _esym
! 44: .data
! 45: _esym: .word 0 /* end of symbol table */
! 46: .globl _C_LABEL(romp)
! 47: .align 8
! 48: .register %g2, #scratch
! 49: .register %g3, #scratch
! 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: /* 64-bit stack */
! 73: btst 1, %sp
! 74: set CC64FSZ, %g1 ! Frame Size (negative)
! 75: bnz 1f
! 76: set BIAS, %g2 ! Bias (negative)
! 77: andn %sp, 0x0f, %sp ! 16 byte align, per ELF spec.
! 78: add %g1, %g2, %g1 ! Frame + Bias
! 79: 1:
! 80: sub %sp, %g1, %g1
! 81: save %g1, %g0, %sp
! 82:
! 83: ! mov %i0, %i4 ! Apparently we get our CIF in i0
! 84:
! 85: /*
! 86: * Set the psr into a known state:
! 87: * Set supervisor mode, interrupt level >= 13, traps enabled
! 88: */
! 89: wrpr %g0, 0, %pil ! So I lied
! 90: wrpr %g0, PSTATE_PRIV+PSTATE_IE, %pstate
! 91:
! 92: clr %g4 ! Point %g4 to start of data segment
! 93: ! only problem is that apparently the
! 94: ! start of the data segment is 0
! 95:
! 96: /*
! 97: * XXXXXXXX Need to determine what params are passed
! 98: */
! 99: call _C_LABEL(setup)
! 100: nop
! 101: mov %i1, %o1
! 102: call _C_LABEL(main)
! 103: mov %i2, %o0
! 104: call _C_LABEL(exit)
! 105: nop
! 106: call _C_LABEL(_rtt)
! 107: nop
! 108:
! 109: /*
! 110: * void syncicache(void *start, int size)
! 111: *
! 112: * I$ flush. Really simple. Just flush over the whole range.
! 113: */
! 114: .align 8
! 115: .globl _C_LABEL(syncicache)
! 116: _C_LABEL(syncicache):
! 117: dec 4, %o1
! 118: flush %o0
! 119: brgz,a,pt %o1, _C_LABEL(syncicache)
! 120: inc 4, %o0
! 121: retl
! 122: nop
! 123:
! 124: /*
! 125: * openfirmware(cell* param);
! 126: *
! 127: * OpenFirmware entry point
! 128: *
! 129: * If we're running in 32-bit mode we need to convert to a 64-bit stack
! 130: * and 64-bit cells. The cells we'll allocate off the stack for simplicity.
! 131: */
! 132: .align 8
! 133: .globl _C_LABEL(openfirmware)
! 134: .proc 1
! 135: FTYPE(openfirmware)
! 136: _C_LABEL(openfirmware):
! 137: andcc %sp, 1, %g0
! 138: bz,pt %icc, 1f
! 139: sethi %hi(_C_LABEL(romp)), %o1
! 140:
! 141: ldx [%o1+%lo(_C_LABEL(romp))], %o4 ! v9 stack, just load the addr and callit
! 142: save %sp, -CC64FSZ, %sp
! 143: mov %i0, %o0 ! Copy over our parameter
! 144: mov %g1, %l1
! 145: mov %g2, %l2
! 146: mov %g3, %l3
! 147: mov %g4, %l4
! 148: mov %g5, %l5
! 149: mov %g6, %l6
! 150: mov %g7, %l7
! 151: rdpr %pstate, %l0
! 152: jmpl %i4, %o7
! 153: wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate
! 154: wrpr %l0, %g0, %pstate
! 155: mov %l1, %g1
! 156: mov %l2, %g2
! 157: mov %l3, %g3
! 158: mov %l4, %g4
! 159: mov %l5, %g5
! 160: mov %l6, %g6
! 161: mov %l7, %g7
! 162: ret
! 163: restore %o0, %g0, %o0
! 164:
! 165: 1: ! v8 -- need to screw with stack & params
! 166: save %sp, -CC64FSZ, %sp ! Get a new 64-bit stack frame
! 167: add %sp, -BIAS, %sp
! 168: sethi %hi(_C_LABEL(romp)), %o1
! 169: rdpr %pstate, %l0
! 170: ldx [%o1+%lo(_C_LABEL(romp))], %o1 ! Do the actual call
! 171: srl %sp, 0, %sp
! 172: mov %i0, %o0
! 173: mov %g1, %l1
! 174: mov %g2, %l2
! 175: mov %g3, %l3
! 176: mov %g4, %l4
! 177: mov %g5, %l5
! 178: mov %g6, %l6
! 179: mov %g7, %l7
! 180: jmpl %o1, %o7
! 181: wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate ! Enable 64-bit addresses for the prom
! 182: wrpr %l0, 0, %pstate
! 183: mov %l1, %g1
! 184: mov %l2, %g2
! 185: mov %l3, %g3
! 186: mov %l4, %g4
! 187: mov %l5, %g5
! 188: mov %l6, %g6
! 189: mov %l7, %g7
! 190: ret
! 191: restore %o0, %g0, %o0
! 192:
! 193: #if 0
! 194: .data
! 195: .align 8
! 196: bootstack:
! 197: #define STACK_SIZE 0x14000
! 198: .skip STACK_SIZE
! 199: ebootstack: ! end (top) of boot stack
! 200: #endif
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