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Annotation of XNU/bsd/dev/ppc/ppc_init.c, revision 1.1

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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