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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22:
23:
24: #include <mach/vm_types.h>
25: #include <mach/vm_param.h>
26: #include <mach/thread_status.h>
27: #include <kern/misc_protos.h>
28: #include <kern/assert.h>
29: #include <kern/cpu_number.h>
30:
31: #include <ppc/proc_reg.h>
32: #include <ppc/boot.h>
33: #include <ppc/misc_protos.h>
34: #include <ppc/pmap.h>
35: #include <ppc/pmap_internals.h>
36: #include <ppc/mem.h>
37: #include <ppc/exception.h>
38: #include <ppc/gdb_defs.h>
39: #include <ppc/POWERMAC/video_board.h>
40: #include <ppc/POWERMAC/video_pdm.h>
41:
42: #ifdef __MACHO__
43: #include <mach-o/mach_header.h>
44: #endif
45:
46: /* External references */
47:
48: extern unsigned int intstack[]; /* declared in start.s */
49: extern unsigned int intstack_top_ss; /* declared in start.s */
50: #if MACH_KGDB
51: extern unsigned int gdbstackptr; /* declared in start.s */
52: extern unsigned int gdbstack_top_ss; /* declared in start.s */
53: #endif /* MACH_KGDB */
54:
55: /* Stuff declared in kern/bootstrap.c which we may need to initialise */
56:
57: extern vm_offset_t boot_start;
58: extern vm_size_t boot_size;
59: extern vm_offset_t boot_region_desc;
60: extern vm_size_t boot_region_count;
61: extern int boot_thread_state_flavor;
62: extern thread_state_t boot_thread_state;
63: extern unsigned int boot_thread_state_count;
64:
65: /* Trap handling function prototypes */
66:
67: extern void thandler(void); /* trap handler */
68: extern void ihandler(void); /* interrupt handler */
69: extern void shandler(void); /* syscall handler */
70: extern void gdbhandler(void); /* debugger handler */
71: extern void fpu_switch(void); /* fp handler */
72: extern void atomic_switch_trap(void); /* fast path atomic thread switch */
73:
74: /* definitions */
75:
76: struct ppc_thread_state boot_task_thread_state;
77:
78:
79:
80:
81:
82: #if 1 /* TODO NMGS - vm_map_steal_memory shouldn't use these - remove */
83: vm_offset_t avail_start;
84: vm_offset_t avail_end;
85: #endif
86: unsigned int avail_remaining = 0;
87: vm_offset_t first_avail;
88:
89: /*
90: * Mach-O Support
91: */
92:
93:
94: #ifdef __MACHO__
95: extern struct mach_header _mh_execute_header;
96: void *sectTEXTB;
97: int sectSizeTEXT;
98: void *sectDATAB;
99: int sectSizeDATA;
100: void *sectOBJCB;
101: int sectSizeOBJC;
102: void *sectLINKB;
103: int sectSizeLINK;
104:
105: vm_offset_t end, etext, edata;
106: #define ETEXT etext
107: #endif
108:
109:
110:
111: void ppc_vm_init(unsigned int memory_size, boot_args *args)
112: {
113: unsigned int htabmask;
114: unsigned int i;
115: vm_offset_t addr;
116: int boot_task_end_offset;
117: #if NCPUS > 1
118: const char *cpus;
119: #endif /* NCPUS > 1 */
120:
121: printf("mem_size = %d M\n",memory_size / (1024 * 1024));
122:
123: #ifdef __MACHO__
124: /* Now retrieve addresses for end, edata, and etext
125: * from MACH-O headers.
126: */
127:
128:
129: etext = (vm_offset_t) sectTEXTB + sectSizeTEXT;
130: edata = (vm_offset_t) sectDATAB + sectSizeDATA;
131: end = getlastaddr();
132: #endif
133:
134: /* Stitch valid memory regions together - they may be contiguous
135: * even though they're not already glued together
136: */
137:
138: /* Go through the list of memory regions passed in via the args
139: * and copy valid entries into the pmap_mem_regions table, adding
140: * further calculated entries.
141: */
142:
143:
144: /* Initialise the pmap system, using space above `first_avail'*/
145:
146: #ifndef __MACHO__
147: free_regions[free_regions_count].start =
148: round_page((unsigned int)&_ExceptionVectorsEnd -
149: (unsigned int)&_ExceptionVectorsStart);
150: #else
151: /* On MACH-O generated kernels, the Exception Vectors
152: * are already mapped and loaded at 0 -- no relocation
153: * or freeing of memory is needed
154: */
155:
156: free_regions[free_regions_count].start = round_page((unsigned int)&_ExceptionVectorsEnd) + 4096;
157: #endif
158:
159: /* If we are on a PDM machine memory at 1M might be used
160: * for video. TODO NMGS call video driver to do this
161: * somehow
162: */
163:
164:
165: /* For PowerMac, first_avail is set to above the bootstrap task.
166: * TODO NMGS - different screen modes - might free mem?
167: */
168:
169: first_avail = round_page(args->first_avail);
170:
171:
172: /* map in the exception vectors */
173: /*
174: * map the kernel text, data and bss. Don't forget other regions too
175: */
176: for (i = 0; i < args->kern_info.region_count; i++) {
177: #if MACH_KDB
178: if (args->kern_info.regions[i].prot == VM_PROT_NONE &&
179: i == args->kern_info.region_count - 1) {
180: /* assume that's the kernel symbol table */
181: kern_sym_start = args->kern_info.regions[i].addr;
182: kern_sym_size = args->kern_info.regions[i].size;
183: printf("kernel symbol table at 0x%x size 0x%x\n",
184: kern_sym_start, kern_sym_size);
185: args->kern_info.regions[i].prot |=
186: (VM_PROT_WRITE|VM_PROT_READ);
187: }
188: #endif /* MACH_KDB */
189:
190: #ifdef __MACHO__
191: /* Skip the VECTORS segment */
192: if (args->kern_info.regions[i].addr == 0)
193: continue;
194: #endif
195:
196: boot_region_count = args->task_info.region_count;
197: boot_size = 0;
198: boot_task_end_offset = 0;
199: /* Map bootstrap task pages 1-1 so that user_bootstrap can find it */
200: for (i = 0; i < boot_region_count; i++) {
201: if (args->task_info.regions[i].mapped) {
202: /* kernel requires everything page aligned */
203: #if DEBUG
204: printf("mapping virt 0x%08x to phys 0x%08x end 0x%x, prot=0x%b\n",
205: ppc_trunc_page(args->task_info.base_addr +
206: args->task_info.regions[i].offset),
207: ppc_trunc_page(args->task_info.base_addr +
208: args->task_info.regions[i].offset),
209: ppc_round_page(args->task_info.base_addr +
210: args->task_info.regions[i].offset +
211: args->task_info.regions[i].size),
212: args->task_info.regions[i].prot,
213: "\x10\1READ\2WRITE\3EXEC");
214: #endif /* DEBUG */
215:
216: (void)pmap_map(
217: ppc_trunc_page(args->task_info.base_addr +
218: args->task_info.regions[i].offset),
219: ppc_trunc_page(args->task_info.base_addr +
220: args->task_info.regions[i].offset),
221: ppc_round_page(args->task_info.base_addr +
222: args->task_info.regions[i].offset +
223: args->task_info.regions[i].size),
224: args->task_info.regions[i].prot);
225:
226: /* Count the size of mapped space */
227: boot_size += args->task_info.regions[i].size;
228:
229: /* There may be an overlapping physical page
230: * mapped to two different virtual addresses
231: */
232: if (boot_task_end_offset >
233: args->task_info.regions[i].offset) {
234: boot_size -= boot_task_end_offset -
235: args->task_info.regions[i].offset;
236: #if DEBUG
237: printf("WARNING - bootstrap overlaps regions\n");
238: #endif /* DEBUG */
239: }
240:
241: boot_task_end_offset =
242: args->task_info.regions[i].offset +
243: args->task_info.regions[i].size;
244: }
245: }
246:
247: if (boot_region_count) {
248:
249: /* Add a new region to the bootstrap task for it's stack */
250: args->task_info.regions[boot_region_count].addr =
251: BOOT_STACK_BASE;
252: args->task_info.regions[boot_region_count].size =
253: BOOT_STACK_SIZE;
254: args->task_info.regions[boot_region_count].mapped = FALSE;
255: boot_region_count++;
256:
257: boot_start = args->task_info.base_addr;
258: boot_region_desc = (vm_offset_t) args->task_info.regions;
259: /* TODO NMGS need to put param info onto top of boot stack */
260: boot_task_thread_state.r1 = BOOT_STACK_PTR-0x100;
261: boot_task_thread_state.srr0 = args->task_info.entry;
262: boot_task_thread_state.srr1 =
263: MSR_MARK_SYSCALL(MSR_EXPORT_MASK_SET);
264:
265: boot_thread_state_flavor = PPC_THREAD_STATE;
266: boot_thread_state_count = PPC_THREAD_STATE_COUNT;
267: boot_thread_state =
268: (thread_state_t)&boot_task_thread_state;
269: }
270:
271:
272:
273: }
274:
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