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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25:
26: #include <machdep/ppc/asm.h>
27: #include <machdep/ppc/proc_reg.h>
28: #include <mach/ppc/vm_param.h>
29: #include <assym.h>
30:
31: /*
32: * Interrupt and bootup stack for initial processor
33: */
34:
35: .file "start.s"
36:
37: .data
38: .align PPC_PGSHIFT /* Align on page boundry */
39: .set ., .+PPC_PGBYTES /* Red zone for interrupt stack*/
40: .globl EXT(intstack) /* intstack itself */
41: EXT(intstack):
42: .set ., .+INTSTACK_SIZE
43:
44: /*
45: * intstack_top_ss points to the topmost saved
46: * state structure in the intstack
47: */
48: .align ALIGNMENT
49: .globl EXT(intstack_top_ss)
50: EXT(intstack_top_ss):
51: .long EXT(intstack)+INTSTACK_SIZE-SS_SIZE
52:
53:
54: /* GDB stack - used by the debugger if present */
55: .globl EXT(gdbstack)
56: EXT(gdbstack):
57: .set ., .+KERNSTACK_SIZE
58:
59: /*
60: * gdbstack_top_ss points to the topmost saved
61: * state structure in the gdbstack
62: */
63: .align ALIGNMENT
64: .globl EXT(gdbstack_top_ss)
65: EXT(gdbstack_top_ss):
66: .long EXT(gdbstack)+KERNSTACK_SIZE-SS_SIZE
67:
68: .globl EXT(gdbstackptr)
69: EXT(gdbstackptr):
70: .long EXT(gdbstack)+KERNSTACK_SIZE-SS_SIZE
71:
72:
73: /*
74: * All CPUs start here.
75: *
76: * How we got to here (as of today 1997.02.27) in execution:
77: *
78: * OpenFirmware loaded the 'SecondaryLoader' from a bootp/tftp server
79: * on the same subnet as this machine. The SecondaryLoader brought
80: * this mach-o (MH_PRELOAD) image into memory and jumped to the
81: * start address.
82: *
83: * We expect that:
84: * we are in supervisor mode (of course!)
85: * Translations are off
86: * ARG0 == pointer to startup parameters
87: *
88: * We do the following:
89: * Force the MSR to a known state
90: * Switch to our stack
91: * Call into the C code.
92: *
93: */
94:
95: .data
96: .align 3
97: EXT(FloatInit):
98: .long 0xC24BC195 /* Initial value */
99: .long 0x87859393 /* of floating point registers */
100: .globl EXT(FloatInit)
101:
102: .text
103: .align 2
104:
105: ASENTRY(start)
106:
107:
108: #ifndef UseOpenFirmware
109: /* Make sure our MSR is valid */
110: li r0, MSR_VM_OFF
111: sync
112: mtmsr r0
113: isync
114: #ifdef UNCACHED_DATA_604
115: lis r28, 0x4 /* flush 128K */
116: lis r0, 0x2
117: .L_loop_flush:
118: lwzx r29, 0, r28
119: subic r28, r28, 32
120: cmpw r0, r28
121: bge+ .L_loop_flush
122: #endif /* UNCACHED_DATA_604 */
123:
124: /* li r28, 0x84 */ /* turn on branch prediction, turn of serial */
125: /* li r28, 0 */
126:
127: mfspr r28, hid0
128:
129: #ifdef UNCACHED_DATA_604
130: rlwinm r28, r28, 0, 21+1, 21-1 /* invalidate data cache */
131: rlwinm r28, r28, 0, 17+1, 17-1 /* turn off data cache */
132: #endif /* UNCACHED_DATA_604 */
133: #ifdef UNCACHED_INST_604
134: rlwinm r28, r28, 0, 20+1, 20-1 /* invalidate inst cache */
135: rlwinm r28, r28, 0, 16+1, 16-1 /* turn off inst cache */
136: #endif /* UNCACHED_INST_604 */
137:
138: //rlwinm r28, r28, 0, 24+1, 24-1 /* turn on serial execution */
139:
140: mtspr hid0,r28
141:
142: #endif /* UseOpenFirmware */
143:
144: li r0, MSR_VM_OFF|MASK(MSR_FP)
145: mtmsr r0
146: isync
147:
148: lis r29,hi16(EXT(FloatInit)) /* Get top of floating point init value */
149: ori r29,r29,lo16(EXT(FloatInit)) /* Slam bottom */
150: lfd f0,0(r29) /* Initialize FP0 */
151: fmr f1,f0 /* Ours is not */
152: fmr f2,f0 /* to wonder why, */
153: fmr f3,f0 /* ours is but to */
154: fmr f4,f0 /* do or die! */
155: fmr f5,f0
156: fmr f6,f0
157: fmr f7,f0
158: fmr f8,f0
159: fmr f9,f0
160: fmr f10,f0
161: fmr f11,f0
162: fmr f12,f0
163: fmr f13,f0
164: fmr f14,f0
165: fmr f15,f0
166: fmr f16,f0
167: fmr f17,f0
168: fmr f18,f0
169: fmr f19,f0
170: fmr f20,f0
171: fmr f21,f0
172: fmr f22,f0
173: fmr f23,f0
174: fmr f24,f0
175: fmr f25,f0
176: fmr f26,f0
177: fmr f27,f0
178: fmr f28,f0
179: fmr f29,f0
180: fmr f30,f0
181: fmr f31,f0
182:
183: li r0, MSR_VM_OFF
184: mtmsr r0
185: isync
186:
187: addis r29, 0, hi16(EXT(intstack_top_ss))
188: ori r29, r29, lo16(EXT(intstack_top_ss))
189: lwz r29, 0(r29)
190:
191: #ifdef GPROF
192: subi r29, r29, FM_REDZONE ; we save more state in ppc_init()
193: #endif
194:
195: li r28, 0
196: stw r28, FM_BACKPTR(r29) /* store a null frame backpointer */
197:
198: /* move onto new stack */
199:
200: mr r1, r29
201:
202: bl EXT(ppc_init)
203:
204: /* Should never return */
205:
206: BREAKPOINT_TRAP
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