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 <sys/cdefs.h>
   49 __FBSDID("$FreeBSD: releng/10.0/sys/arm/xscale/i8134x/crb_machdep.c 247564 2013-03-01 19:02:41Z alc $");
   50 
   51 #define _ARM32_BUS_DMA_PRIVATE
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/sysproto.h>
   55 #include <sys/signalvar.h>
   56 #include <sys/imgact.h>
   57 #include <sys/kernel.h>
   58 #include <sys/ktr.h>
   59 #include <sys/linker.h>
   60 #include <sys/lock.h>
   61 #include <sys/malloc.h>
   62 #include <sys/mutex.h>
   63 #include <sys/pcpu.h>
   64 #include <sys/proc.h>
   65 #include <sys/ptrace.h>
   66 #include <sys/cons.h>
   67 #include <sys/bio.h>
   68 #include <sys/bus.h>
   69 #include <sys/buf.h>
   70 #include <sys/exec.h>
   71 #include <sys/kdb.h>
   72 #include <sys/msgbuf.h>
   73 #include <machine/reg.h>
   74 #include <machine/cpu.h>
   75 
   76 #include <vm/vm.h>
   77 #include <vm/pmap.h>
   78 #include <vm/vm_object.h>
   79 #include <vm/vm_page.h>
   80 #include <vm/vm_map.h>
   81 #include <machine/vmparam.h>
   82 #include <machine/pcb.h>
   83 #include <machine/undefined.h>
   84 #include <machine/machdep.h>
   85 #include <machine/metadata.h>
   86 #include <machine/armreg.h>
   87 #include <machine/bus.h>
   88 #include <sys/reboot.h>
   89 
   90 
   91 #include <arm/xscale/i80321/i80321var.h> /* For i80321_calibrate_delay() */
   92 
   93 #include <arm/xscale/i8134x/i81342reg.h>
   94 #include <arm/xscale/i8134x/i81342var.h>
   95 #include <arm/xscale/i8134x/obiovar.h>
   96 
   97 
   98 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
   99 #define KERNEL_PT_IOPXS         1
  100 #define KERNEL_PT_BEFOREKERN    2
  101 #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
  102 #define KERNEL_PT_AFKERNEL_NUM  9
  103 
  104 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
  105 #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
  106 
  107 extern u_int data_abort_handler_address;
  108 extern u_int prefetch_abort_handler_address;
  109 extern u_int undefined_handler_address;
  110 
  111 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  112 
  113 /* Physical and virtual addresses for some global pages */
  114 
  115 vm_paddr_t phys_avail[10];
  116 vm_paddr_t dump_avail[4];
  117 
  118 struct pv_addr systempage;
  119 struct pv_addr msgbufpv;
  120 struct pv_addr irqstack;
  121 struct pv_addr undstack;
  122 struct pv_addr abtstack;
  123 struct pv_addr kernelstack;
  124 
  125 /* Static device mappings. */
  126 static const struct pmap_devmap iq81342_devmap[] = {
  127             {
  128                     IOP34X_VADDR,
  129                     IOP34X_HWADDR,
  130                     IOP34X_SIZE,
  131                     VM_PROT_READ|VM_PROT_WRITE,
  132                     PTE_NOCACHE,
  133             },
  134             {
  135                     /*
  136                      * Cheat and map a whole section, this will bring
  137                      * both PCI-X and PCI-E outbound I/O
  138                      */
  139                     IOP34X_PCIX_OIOBAR_VADDR &~ (0x100000 - 1),
  140                     IOP34X_PCIX_OIOBAR &~ (0x100000 - 1),
  141                     0x100000,
  142                     VM_PROT_READ|VM_PROT_WRITE,
  143                     PTE_NOCACHE,
  144             },
  145             {
  146                     IOP34X_PCE1_VADDR,
  147                     IOP34X_PCE1,
  148                     IOP34X_PCE1_SIZE,
  149                     VM_PROT_READ|VM_PROT_WRITE,
  150                     PTE_NOCACHE,
  151             },
  152             {   
  153                     0,
  154                     0,
  155                     0,
  156                     0,
  157                     0,
  158             }
  159 };
  160 
  161 #define SDRAM_START 0x00000000
  162 
  163 extern vm_offset_t xscale_cache_clean_addr;
  164 
  165 void *
  166 initarm(struct arm_boot_params *abp)
  167 {
  168         struct pv_addr  kernel_l1pt;
  169         struct pv_addr  dpcpu;
  170         int loop, i;
  171         u_int l1pagetable;
  172         vm_offset_t freemempos;
  173         vm_offset_t freemem_pt;
  174         vm_offset_t afterkern;
  175         vm_offset_t freemem_after;
  176         vm_offset_t lastaddr;
  177         uint32_t memsize, memstart;
  178 
  179         lastaddr = parse_boot_param(abp);
  180         set_cpufuncs();
  181         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  182         PCPU_SET(curthread, &thread0);
  183 
  184         /* Do basic tuning, hz etc */
  185         init_param1();
  186 
  187         freemempos = 0x00200000;
  188         /* Define a macro to simplify memory allocation */
  189 #define valloc_pages(var, np)                   \
  190         alloc_pages((var).pv_pa, (np));         \
  191         (var).pv_va = (var).pv_pa + 0xc0000000;
  192 
  193 #define alloc_pages(var, np)                    \
  194         freemempos -= (np * PAGE_SIZE);         \
  195         (var) = freemempos;             \
  196         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  197 
  198         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  199                 freemempos -= PAGE_SIZE;
  200         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  201         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  202                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  203                         valloc_pages(kernel_pt_table[loop],
  204                             L2_TABLE_SIZE / PAGE_SIZE);
  205                 } else {
  206                         kernel_pt_table[loop].pv_pa = freemempos +
  207                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  208                             L2_TABLE_SIZE_REAL;
  209                         kernel_pt_table[loop].pv_va =
  210                             kernel_pt_table[loop].pv_pa + 0xc0000000;
  211                 }
  212         }
  213         freemem_pt = freemempos;
  214         freemempos = 0x00100000;
  215         /*
  216          * Allocate a page for the system page mapped to V0x00000000
  217          * This page will just contain the system vectors and can be
  218          * shared by all processes.
  219          */
  220         valloc_pages(systempage, 1);
  221 
  222         /* Allocate dynamic per-cpu area. */
  223         valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
  224         dpcpu_init((void *)dpcpu.pv_va, 0);
  225 
  226         /* Allocate stacks for all modes */
  227         valloc_pages(irqstack, IRQ_STACK_SIZE);
  228         valloc_pages(abtstack, ABT_STACK_SIZE);
  229         valloc_pages(undstack, UND_STACK_SIZE);
  230         valloc_pages(kernelstack, KSTACK_PAGES);
  231         valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
  232 #ifdef ARM_USE_SMALL_ALLOC
  233         freemempos -= PAGE_SIZE;
  234         freemem_pt = trunc_page(freemem_pt);
  235         freemem_after = freemempos - ((freemem_pt - 0x00100000) /
  236             PAGE_SIZE) * sizeof(struct arm_small_page);
  237         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  238             , (void *)0xc0100000, freemem_pt - 0x00100000, 1);
  239         freemem_after -= ((freemem_after - 0x00001000) / PAGE_SIZE) *
  240             sizeof(struct arm_small_page);
  241 #if 0
  242         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  243         , (void *)0xc0001000, trunc_page(freemem_after) - 0x00001000, 0);
  244 #endif
  245         freemempos = trunc_page(freemem_after);
  246         freemempos -= PAGE_SIZE;
  247 #endif
  248         /*
  249          * Now we start construction of the L1 page table
  250          * We start by mapping the L2 page tables into the L1.
  251          * This means that we can replace L1 mappings later on if necessary
  252          */
  253         l1pagetable = kernel_l1pt.pv_va;
  254 
  255         /* Map the L2 pages tables in the L1 page table */
  256         pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH & ~(0x00100000 - 1),
  257             &kernel_pt_table[KERNEL_PT_SYS]);
  258         pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
  259             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  260 
  261         pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
  262             0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  263 
  264         pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
  265            (((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE) & ~(L1_S_SIZE - 1),
  266             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  267         freemem_after = ((int)lastaddr + PAGE_SIZE) & ~(PAGE_SIZE - 1);
  268         afterkern = round_page(((vm_offset_t)lastaddr + L1_S_SIZE) & ~(L1_S_SIZE
  269             - 1));
  270         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  271                 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
  272                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  273         }
  274         
  275 
  276 #ifdef ARM_USE_SMALL_ALLOC
  277         if ((freemem_after + 2 * PAGE_SIZE) <= afterkern) {
  278                 arm_add_smallalloc_pages((void *)(freemem_after),
  279                     (void*)(freemem_after + PAGE_SIZE),
  280                     afterkern - (freemem_after + PAGE_SIZE), 0);
  281                 
  282         }
  283 #endif
  284 
  285         /* Map the vector page. */
  286         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  287             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  288         pmap_devmap_bootstrap(l1pagetable, iq81342_devmap);
  289         /*
  290          * Give the XScale global cache clean code an appropriately
  291          * sized chunk of unmapped VA space starting at 0xff000000
  292          * (our device mappings end before this address).
  293          */
  294         xscale_cache_clean_addr = 0xff000000U;
  295 
  296         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  297         setttb(kernel_l1pt.pv_pa);
  298         cpu_tlb_flushID();
  299         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  300         /*
  301          * Pages were allocated during the secondary bootstrap for the
  302          * stacks for different CPU modes.
  303          * We must now set the r13 registers in the different CPU modes to
  304          * point to these stacks.
  305          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  306          * of the stack memory.
  307          */
  308 
  309         set_stackptrs(0);
  310 
  311         /*
  312          * We must now clean the cache again....
  313          * Cleaning may be done by reading new data to displace any
  314          * dirty data in the cache. This will have happened in setttb()
  315          * but since we are boot strapping the addresses used for the read
  316          * may have just been remapped and thus the cache could be out
  317          * of sync. A re-clean after the switch will cure this.
  318          * After booting there are no gross relocations of the kernel thus
  319          * this problem will not occur after initarm().
  320          */
  321         cpu_idcache_wbinv_all();
  322         i80321_calibrate_delay();
  323         i81342_sdram_bounds(&obio_bs_tag, IOP34X_VADDR, &memstart, &memsize);
  324         physmem = memsize / PAGE_SIZE;
  325         cninit();
  326         /* Set stack for exception handlers */
  327         
  328         data_abort_handler_address = (u_int)data_abort_handler;
  329         prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
  330         undefined_handler_address = (u_int)undefinedinstruction_bounce;
  331         undefined_init();
  332                                 
  333         init_proc0(kernelstack.pv_va);
  334         
  335         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  336 
  337         pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
  338         /*
  339          * ARM_USE_SMALL_ALLOC uses dump_avail, so it must be filled before
  340          * calling pmap_bootstrap.
  341          */
  342         dump_avail[0] = 0x00000000;
  343         dump_avail[1] = 0x00000000 + memsize;
  344         dump_avail[2] = 0;
  345         dump_avail[3] = 0;
  346                                         
  347         vm_max_kernel_address = 0xd0000000;
  348         pmap_bootstrap(pmap_curmaxkvaddr, &kernel_l1pt);
  349         msgbufp = (void*)msgbufpv.pv_va;
  350         msgbufinit(msgbufp, msgbufsize);
  351         mutex_init();
  352         
  353         i = 0;
  354 #ifdef ARM_USE_SMALL_ALLOC
  355         phys_avail[i++] = 0x00001000;
  356         phys_avail[i++] = 0x00002000;   /*
  357                                          *XXX: Gross hack to get our
  358                                          * pages in the vm_page_array
  359                                          . */
  360 #endif
  361         phys_avail[i++] = round_page(virtual_avail - KERNBASE + SDRAM_START);
  362         phys_avail[i++] = trunc_page(0x00000000 + memsize - 1);
  363         phys_avail[i++] = 0;
  364         phys_avail[i] = 0;
  365         
  366         init_param2(physmem);
  367         kdb_init();
  368         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  369             sizeof(struct pcb)));
  370 }

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