The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/i8134x/crb_machdep.c

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    1 /*      $NetBSD: hpc_machdep.c,v 1.70 2003/09/16 08:18:22 agc Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1994-1998 Mark Brinicombe.
    5  * Copyright (c) 1994 Brini.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software written for Brini by Mark Brinicombe
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Brini.
   21  * 4. The name of the company nor the name of the author may be used to
   22  *    endorse or promote products derived from this software without specific
   23  *    prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
   26  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   27  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   29  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   30  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * RiscBSD kernel project
   38  *
   39  * machdep.c
   40  *
   41  * Machine dependant functions for kernel setup
   42  *
   43  * This file needs a lot of work. 
   44  *
   45  * Created      : 17/09/94
   46  */
   47 
   48 #include "opt_msgbuf.h"
   49 #include "opt_ddb.h"
   50 
   51 #include <sys/cdefs.h>
   52 __FBSDID("$FreeBSD$");
   53 
   54 #define _ARM32_BUS_DMA_PRIVATE
   55 #include <sys/param.h>
   56 #include <sys/systm.h>
   57 #include <sys/sysproto.h>
   58 #include <sys/signalvar.h>
   59 #include <sys/imgact.h>
   60 #include <sys/kernel.h>
   61 #include <sys/ktr.h>
   62 #include <sys/linker.h>
   63 #include <sys/lock.h>
   64 #include <sys/malloc.h>
   65 #include <sys/mutex.h>
   66 #include <sys/pcpu.h>
   67 #include <sys/proc.h>
   68 #include <sys/ptrace.h>
   69 #include <sys/cons.h>
   70 #include <sys/bio.h>
   71 #include <sys/bus.h>
   72 #include <sys/buf.h>
   73 #include <sys/exec.h>
   74 #include <sys/kdb.h>
   75 #include <sys/msgbuf.h>
   76 #include <machine/reg.h>
   77 #include <machine/cpu.h>
   78 
   79 #include <vm/vm.h>
   80 #include <vm/pmap.h>
   81 #include <vm/vm.h>
   82 #include <vm/vm_object.h>
   83 #include <vm/vm_page.h>
   84 #include <vm/vm_pager.h>
   85 #include <vm/vm_map.h>
   86 #include <vm/vnode_pager.h>
   87 #include <machine/pmap.h>
   88 #include <machine/vmparam.h>
   89 #include <machine/pcb.h>
   90 #include <machine/undefined.h>
   91 #include <machine/machdep.h>
   92 #include <machine/metadata.h>
   93 #include <machine/armreg.h>
   94 #include <machine/bus.h>
   95 #include <sys/reboot.h>
   96 
   97 
   98 #include <arm/xscale/i80321/i80321var.h> /* For i80321_calibrate_delay() */
   99 
  100 #include <arm/xscale/i8134x/i81342reg.h>
  101 #include <arm/xscale/i8134x/i81342var.h>
  102 #include <arm/xscale/i8134x/obiovar.h>
  103 
  104 
  105 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
  106 #define KERNEL_PT_IOPXS         1
  107 #define KERNEL_PT_BEFOREKERN    2
  108 #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
  109 #define KERNEL_PT_AFKERNEL_NUM  9
  110 
  111 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
  112 #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
  113 
  114 /* Define various stack sizes in pages */
  115 #define IRQ_STACK_SIZE  1
  116 #define ABT_STACK_SIZE  1
  117 #ifdef IPKDB
  118 #define UND_STACK_SIZE  2
  119 #else
  120 #define UND_STACK_SIZE  1
  121 #endif
  122 
  123 extern u_int data_abort_handler_address;
  124 extern u_int prefetch_abort_handler_address;
  125 extern u_int undefined_handler_address;
  126 
  127 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  128 
  129 extern void *_end;
  130 
  131 extern vm_offset_t sa1_cache_clean_addr;
  132 
  133 extern int *end;
  134 
  135 struct pcpu __pcpu;
  136 struct pcpu *pcpup = &__pcpu;
  137 
  138 /* Physical and virtual addresses for some global pages */
  139 
  140 vm_paddr_t phys_avail[10];
  141 vm_paddr_t dump_avail[4];
  142 vm_offset_t physical_pages;
  143 vm_offset_t clean_sva, clean_eva;
  144 
  145 struct pv_addr systempage;
  146 struct pv_addr msgbufpv;
  147 struct pv_addr irqstack;
  148 struct pv_addr undstack;
  149 struct pv_addr abtstack;
  150 struct pv_addr kernelstack;
  151 
  152 static struct trapframe proc0_tf;
  153 
  154 /* Static device mappings. */
  155 static const struct pmap_devmap iq81342_devmap[] = {
  156             {
  157                     IOP34X_VADDR,
  158                     IOP34X_HWADDR,
  159                     IOP34X_SIZE,
  160                     VM_PROT_READ|VM_PROT_WRITE,
  161                     PTE_NOCACHE,
  162             },
  163             {
  164                     /*
  165                      * Cheat and map a whole section, this will bring
  166                      * both PCI-X and PCI-E outbound I/O
  167                      */
  168                     IOP34X_PCIX_OIOBAR_VADDR &~ (0x100000 - 1),
  169                     IOP34X_PCIX_OIOBAR &~ (0x100000 - 1),
  170                     0x100000,
  171                     VM_PROT_READ|VM_PROT_WRITE,
  172                     PTE_NOCACHE,
  173             },
  174             {
  175                     IOP34X_PCE1_VADDR,
  176                     IOP34X_PCE1,
  177                     IOP34X_PCE1_SIZE,
  178                     VM_PROT_READ|VM_PROT_WRITE,
  179                     PTE_NOCACHE,
  180             },
  181             {       
  182                     0,
  183                     0,
  184                     0,
  185                     0,
  186                     0,
  187             }
  188 };
  189 
  190 #define SDRAM_START 0x00000000
  191 
  192 #ifdef DDB
  193 extern vm_offset_t ksym_start, ksym_end;
  194 #endif
  195 
  196 extern vm_offset_t xscale_cache_clean_addr;
  197 
  198 void *
  199 initarm(void *arg, void *arg2)
  200 {
  201         struct pv_addr  kernel_l1pt;
  202         int loop;
  203         u_int l1pagetable;
  204         vm_offset_t freemempos;
  205         vm_offset_t freemem_pt;
  206         vm_offset_t afterkern;
  207         vm_offset_t freemem_after;
  208         vm_offset_t lastaddr;
  209 #ifdef DDB
  210         vm_offset_t zstart = 0, zend = 0;
  211 #endif
  212         int i;
  213         uint32_t fake_preload[35];
  214         uint32_t memsize, memstart;
  215 
  216         i = 0;
  217 
  218         set_cpufuncs();
  219         fake_preload[i++] = MODINFO_NAME;
  220         fake_preload[i++] = strlen("elf kernel") + 1;
  221         strcpy((char*)&fake_preload[i++], "elf kernel");
  222         i += 2;
  223         fake_preload[i++] = MODINFO_TYPE;
  224         fake_preload[i++] = strlen("elf kernel") + 1;
  225         strcpy((char*)&fake_preload[i++], "elf kernel");
  226         i += 2;
  227         fake_preload[i++] = MODINFO_ADDR;
  228         fake_preload[i++] = sizeof(vm_offset_t);
  229         fake_preload[i++] = KERNBASE + 0x00200000;
  230         fake_preload[i++] = MODINFO_SIZE;
  231         fake_preload[i++] = sizeof(uint32_t);
  232         fake_preload[i++] = (uint32_t)&end - KERNBASE - 0x00200000;
  233 #ifdef DDB
  234         if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) {
  235                 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM;
  236                 fake_preload[i++] = sizeof(vm_offset_t);
  237                 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4);
  238                 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM;
  239                 fake_preload[i++] = sizeof(vm_offset_t);
  240                 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8);
  241                 lastaddr = *(uint32_t *)(KERNVIRTADDR + 8);
  242                 zend = lastaddr;
  243                 zstart = *(uint32_t *)(KERNVIRTADDR + 4);
  244                 ksym_start = zstart;
  245                 ksym_end = zend;
  246         } else
  247 #endif
  248                 lastaddr = (vm_offset_t)&end;
  249 
  250         fake_preload[i++] = 0;
  251         fake_preload[i] = 0;
  252         preload_metadata = (void *)fake_preload;
  253 
  254 
  255         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  256         PCPU_SET(curthread, &thread0);
  257 
  258 #define KERNEL_TEXT_BASE (KERNBASE + 0x00200000)
  259         freemempos = 0x00200000;
  260         /* Define a macro to simplify memory allocation */
  261 #define valloc_pages(var, np)                   \
  262         alloc_pages((var).pv_pa, (np));         \
  263         (var).pv_va = (var).pv_pa + 0xc0000000;
  264 
  265 #define alloc_pages(var, np)                    \
  266         freemempos -= (np * PAGE_SIZE);         \
  267         (var) = freemempos;             \
  268         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  269 
  270         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  271                 freemempos -= PAGE_SIZE;
  272         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  273         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  274                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  275                         valloc_pages(kernel_pt_table[loop],
  276                             L2_TABLE_SIZE / PAGE_SIZE);
  277                 } else {
  278                         kernel_pt_table[loop].pv_pa = freemempos +
  279                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  280                             L2_TABLE_SIZE_REAL;
  281                         kernel_pt_table[loop].pv_va = 
  282                             kernel_pt_table[loop].pv_pa + 0xc0000000;
  283                 }
  284         }
  285         freemem_pt = freemempos;
  286         freemempos = 0x00100000;
  287         /*
  288          * Allocate a page for the system page mapped to V0x00000000
  289          * This page will just contain the system vectors and can be
  290          * shared by all processes.
  291          */
  292         valloc_pages(systempage, 1);
  293 
  294         /* Allocate stacks for all modes */
  295         valloc_pages(irqstack, IRQ_STACK_SIZE);
  296         valloc_pages(abtstack, ABT_STACK_SIZE);
  297         valloc_pages(undstack, UND_STACK_SIZE);
  298         valloc_pages(kernelstack, KSTACK_PAGES);
  299         valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE);
  300 #ifdef ARM_USE_SMALL_ALLOC
  301         freemempos -= PAGE_SIZE;
  302         freemem_pt = trunc_page(freemem_pt);
  303         freemem_after = freemempos - ((freemem_pt - 0x00100000) /
  304             PAGE_SIZE) * sizeof(struct arm_small_page);
  305         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  306             , (void *)0xc0100000, freemem_pt - 0x00100000, 1);
  307         freemem_after -= ((freemem_after - 0x00001000) / PAGE_SIZE) *
  308             sizeof(struct arm_small_page);
  309 #if 0
  310         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  311         , (void *)0xc0001000, trunc_page(freemem_after) - 0x00001000, 0);
  312 #endif
  313         freemempos = trunc_page(freemem_after);
  314         freemempos -= PAGE_SIZE;
  315 #endif
  316         /*
  317          * Now we start construction of the L1 page table
  318          * We start by mapping the L2 page tables into the L1.
  319          * This means that we can replace L1 mappings later on if necessary
  320          */
  321         l1pagetable = kernel_l1pt.pv_va;
  322 
  323         /* Map the L2 pages tables in the L1 page table */
  324         pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH & ~(0x00100000 - 1),
  325             &kernel_pt_table[KERNEL_PT_SYS]);
  326         pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
  327             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  328 
  329         pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
  330             0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  331 
  332         pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
  333            (((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE) & ~(L1_S_SIZE - 1),
  334             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  335         freemem_after = ((int)lastaddr + PAGE_SIZE) & ~(PAGE_SIZE - 1);
  336         afterkern = round_page(((vm_offset_t)lastaddr + L1_S_SIZE) & ~(L1_S_SIZE 
  337             - 1));
  338         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  339                 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
  340                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  341         }
  342         
  343 
  344 #ifdef ARM_USE_SMALL_ALLOC
  345         if ((freemem_after + 2 * PAGE_SIZE) <= afterkern) {
  346                 arm_add_smallalloc_pages((void *)(freemem_after),
  347                     (void*)(freemem_after + PAGE_SIZE),
  348                     afterkern - (freemem_after + PAGE_SIZE), 0);
  349                     
  350         }
  351 #endif
  352 
  353         /* Map the vector page. */
  354         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  355             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  356         pmap_devmap_bootstrap(l1pagetable, iq81342_devmap);
  357         /*
  358          * Give the XScale global cache clean code an appropriately
  359          * sized chunk of unmapped VA space starting at 0xff000000
  360          * (our device mappings end before this address).
  361          */
  362         xscale_cache_clean_addr = 0xff000000U;
  363 
  364         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  365         setttb(kernel_l1pt.pv_pa);
  366         cpu_tlb_flushID();
  367         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  368         /*
  369          * Pages were allocated during the secondary bootstrap for the
  370          * stacks for different CPU modes.
  371          * We must now set the r13 registers in the different CPU modes to
  372          * point to these stacks.
  373          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  374          * of the stack memory.
  375          */
  376 
  377                                    
  378         set_stackptr(PSR_IRQ32_MODE,
  379             irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
  380         set_stackptr(PSR_ABT32_MODE,
  381             abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
  382         set_stackptr(PSR_UND32_MODE,
  383             undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
  384 
  385 
  386 
  387         /*
  388          * We must now clean the cache again....
  389          * Cleaning may be done by reading new data to displace any
  390          * dirty data in the cache. This will have happened in setttb()
  391          * but since we are boot strapping the addresses used for the read
  392          * may have just been remapped and thus the cache could be out
  393          * of sync. A re-clean after the switch will cure this.
  394          * After booting there are no gross reloations of the kernel thus
  395          * this problem will not occur after initarm().
  396          */
  397         cpu_idcache_wbinv_all();
  398         i80321_calibrate_delay();
  399         i81342_sdram_bounds(&obio_bs_tag, IOP34X_VADDR, &memstart, &memsize);
  400         physmem = memsize / PAGE_SIZE;
  401         cninit();
  402         /* Set stack for exception handlers */
  403         
  404         data_abort_handler_address = (u_int)data_abort_handler;
  405         prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
  406         undefined_handler_address = (u_int)undefinedinstruction_bounce;
  407         undefined_init();
  408                                 
  409 #ifdef KSE
  410         proc_linkup(&proc0, &ksegrp0, &thread0);
  411 #else
  412         proc_linkup0(&proc0, &thread0);
  413 #endif
  414         thread0.td_kstack = kernelstack.pv_va;
  415         thread0.td_pcb = (struct pcb *)
  416                 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  417         thread0.td_pcb->pcb_flags = 0;
  418         thread0.td_frame = &proc0_tf;
  419         pcpup->pc_curpcb = thread0.td_pcb;
  420         
  421         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  422 
  423         pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
  424         /*
  425          * ARM_USE_SMALL_ALLOC uses dump_avail, so it must be filled before
  426          * calling pmap_bootstrap.
  427          */
  428         dump_avail[0] = 0x00000000;
  429         dump_avail[1] = 0x00000000 + memsize;
  430         dump_avail[2] = 0;
  431         dump_avail[3] = 0;
  432                                         
  433         pmap_bootstrap(pmap_curmaxkvaddr, 
  434             0xd0000000, &kernel_l1pt);
  435         msgbufp = (void*)msgbufpv.pv_va;
  436         msgbufinit(msgbufp, MSGBUF_SIZE);
  437         mutex_init();
  438         
  439         i = 0;
  440 #ifdef ARM_USE_SMALL_ALLOC
  441         phys_avail[i++] = 0x00000000;
  442         phys_avail[i++] = 0x00001000;   /*
  443                                          *XXX: Gross hack to get our
  444                                          * pages in the vm_page_array
  445                                          . */
  446 #endif
  447         phys_avail[i++] = round_page(virtual_avail - KERNBASE + SDRAM_START);
  448         phys_avail[i++] = trunc_page(0x00000000 + memsize - 1);
  449         phys_avail[i++] = 0;
  450         phys_avail[i] = 0;
  451         
  452         /* Do basic tuning, hz etc */
  453         init_param1();
  454         init_param2(physmem);
  455         kdb_init();
  456         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  457             sizeof(struct pcb)));
  458 }

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