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 
   50 #include <sys/cdefs.h>
   51 __FBSDID("$FreeBSD$");
   52 
   53 #define _ARM32_BUS_DMA_PRIVATE
   54 #include <sys/param.h>
   55 #include <sys/systm.h>
   56 #include <sys/sysproto.h>
   57 #include <sys/signalvar.h>
   58 #include <sys/imgact.h>
   59 #include <sys/kernel.h>
   60 #include <sys/ktr.h>
   61 #include <sys/linker.h>
   62 #include <sys/lock.h>
   63 #include <sys/malloc.h>
   64 #include <sys/mutex.h>
   65 #include <sys/pcpu.h>
   66 #include <sys/proc.h>
   67 #include <sys/ptrace.h>
   68 #include <sys/cons.h>
   69 #include <sys/bio.h>
   70 #include <sys/bus.h>
   71 #include <sys/buf.h>
   72 #include <sys/exec.h>
   73 #include <sys/kdb.h>
   74 #include <sys/msgbuf.h>
   75 #include <machine/reg.h>
   76 #include <machine/cpu.h>
   77 
   78 #include <vm/vm.h>
   79 #include <vm/pmap.h>
   80 #include <vm/vm_object.h>
   81 #include <vm/vm_page.h>
   82 #include <vm/vm_pager.h>
   83 #include <vm/vm_map.h>
   84 #include <vm/vnode_pager.h>
   85 #include <machine/pmap.h>
   86 #include <machine/vmparam.h>
   87 #include <machine/pcb.h>
   88 #include <machine/undefined.h>
   89 #include <machine/machdep.h>
   90 #include <machine/metadata.h>
   91 #include <machine/armreg.h>
   92 #include <machine/bus.h>
   93 #include <sys/reboot.h>
   94 
   95 
   96 #include <arm/xscale/i80321/i80321var.h> /* For i80321_calibrate_delay() */
   97 
   98 #include <arm/xscale/i8134x/i81342reg.h>
   99 #include <arm/xscale/i8134x/i81342var.h>
  100 #include <arm/xscale/i8134x/obiovar.h>
  101 
  102 
  103 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
  104 #define KERNEL_PT_IOPXS         1
  105 #define KERNEL_PT_BEFOREKERN    2
  106 #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
  107 #define KERNEL_PT_AFKERNEL_NUM  9
  108 
  109 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
  110 #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
  111 
  112 /* Define various stack sizes in pages */
  113 #define IRQ_STACK_SIZE  1
  114 #define ABT_STACK_SIZE  1
  115 #define UND_STACK_SIZE  1
  116 
  117 extern u_int data_abort_handler_address;
  118 extern u_int prefetch_abort_handler_address;
  119 extern u_int undefined_handler_address;
  120 
  121 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  122 extern int *end;
  123 
  124 struct pcpu __pcpu;
  125 struct pcpu *pcpup = &__pcpu;
  126 
  127 /* Physical and virtual addresses for some global pages */
  128 
  129 vm_paddr_t phys_avail[10];
  130 vm_paddr_t dump_avail[4];
  131 vm_offset_t physical_pages;
  132 
  133 struct pv_addr systempage;
  134 struct pv_addr msgbufpv;
  135 struct pv_addr irqstack;
  136 struct pv_addr undstack;
  137 struct pv_addr abtstack;
  138 struct pv_addr kernelstack;
  139 
  140 static struct trapframe proc0_tf;
  141 
  142 /* Static device mappings. */
  143 static const struct pmap_devmap iq81342_devmap[] = {
  144             {
  145                     IOP34X_VADDR,
  146                     IOP34X_HWADDR,
  147                     IOP34X_SIZE,
  148                     VM_PROT_READ|VM_PROT_WRITE,
  149                     PTE_NOCACHE,
  150             },
  151             {
  152                     /*
  153                      * Cheat and map a whole section, this will bring
  154                      * both PCI-X and PCI-E outbound I/O
  155                      */
  156                     IOP34X_PCIX_OIOBAR_VADDR &~ (0x100000 - 1),
  157                     IOP34X_PCIX_OIOBAR &~ (0x100000 - 1),
  158                     0x100000,
  159                     VM_PROT_READ|VM_PROT_WRITE,
  160                     PTE_NOCACHE,
  161             },
  162             {
  163                     IOP34X_PCE1_VADDR,
  164                     IOP34X_PCE1,
  165                     IOP34X_PCE1_SIZE,
  166                     VM_PROT_READ|VM_PROT_WRITE,
  167                     PTE_NOCACHE,
  168             },
  169             {       
  170                     0,
  171                     0,
  172                     0,
  173                     0,
  174                     0,
  175             }
  176 };
  177 
  178 #define SDRAM_START 0x00000000
  179 
  180 extern vm_offset_t xscale_cache_clean_addr;
  181 
  182 void *
  183 initarm(void *arg, void *arg2)
  184 {
  185         struct pv_addr  kernel_l1pt;
  186         int loop, i;
  187         u_int l1pagetable;
  188         vm_offset_t freemempos;
  189         vm_offset_t freemem_pt;
  190         vm_offset_t afterkern;
  191         vm_offset_t freemem_after;
  192         vm_offset_t lastaddr;
  193         uint32_t memsize, memstart;
  194 
  195         set_cpufuncs();
  196         lastaddr = fake_preload_metadata();
  197         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  198         PCPU_SET(curthread, &thread0);
  199 
  200         freemempos = 0x00200000;
  201         /* Define a macro to simplify memory allocation */
  202 #define valloc_pages(var, np)                   \
  203         alloc_pages((var).pv_pa, (np));         \
  204         (var).pv_va = (var).pv_pa + 0xc0000000;
  205 
  206 #define alloc_pages(var, np)                    \
  207         freemempos -= (np * PAGE_SIZE);         \
  208         (var) = freemempos;             \
  209         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  210 
  211         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  212                 freemempos -= PAGE_SIZE;
  213         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  214         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  215                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  216                         valloc_pages(kernel_pt_table[loop],
  217                             L2_TABLE_SIZE / PAGE_SIZE);
  218                 } else {
  219                         kernel_pt_table[loop].pv_pa = freemempos +
  220                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  221                             L2_TABLE_SIZE_REAL;
  222                         kernel_pt_table[loop].pv_va = 
  223                             kernel_pt_table[loop].pv_pa + 0xc0000000;
  224                 }
  225         }
  226         freemem_pt = freemempos;
  227         freemempos = 0x00100000;
  228         /*
  229          * Allocate a page for the system page mapped to V0x00000000
  230          * This page will just contain the system vectors and can be
  231          * shared by all processes.
  232          */
  233         valloc_pages(systempage, 1);
  234 
  235         /* Allocate stacks for all modes */
  236         valloc_pages(irqstack, IRQ_STACK_SIZE);
  237         valloc_pages(abtstack, ABT_STACK_SIZE);
  238         valloc_pages(undstack, UND_STACK_SIZE);
  239         valloc_pages(kernelstack, KSTACK_PAGES);
  240         valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE);
  241 #ifdef ARM_USE_SMALL_ALLOC
  242         freemempos -= PAGE_SIZE;
  243         freemem_pt = trunc_page(freemem_pt);
  244         freemem_after = freemempos - ((freemem_pt - 0x00100000) /
  245             PAGE_SIZE) * sizeof(struct arm_small_page);
  246         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  247             , (void *)0xc0100000, freemem_pt - 0x00100000, 1);
  248         freemem_after -= ((freemem_after - 0x00001000) / PAGE_SIZE) *
  249             sizeof(struct arm_small_page);
  250 #if 0
  251         arm_add_smallalloc_pages((void *)(freemem_after + 0xc0000000)
  252         , (void *)0xc0001000, trunc_page(freemem_after) - 0x00001000, 0);
  253 #endif
  254         freemempos = trunc_page(freemem_after);
  255         freemempos -= PAGE_SIZE;
  256 #endif
  257         /*
  258          * Now we start construction of the L1 page table
  259          * We start by mapping the L2 page tables into the L1.
  260          * This means that we can replace L1 mappings later on if necessary
  261          */
  262         l1pagetable = kernel_l1pt.pv_va;
  263 
  264         /* Map the L2 pages tables in the L1 page table */
  265         pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH & ~(0x00100000 - 1),
  266             &kernel_pt_table[KERNEL_PT_SYS]);
  267         pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
  268             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  269 
  270         pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
  271             0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  272 
  273         pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
  274            (((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE) & ~(L1_S_SIZE - 1),
  275             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  276         freemem_after = ((int)lastaddr + PAGE_SIZE) & ~(PAGE_SIZE - 1);
  277         afterkern = round_page(((vm_offset_t)lastaddr + L1_S_SIZE) & ~(L1_S_SIZE 
  278             - 1));
  279         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  280                 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
  281                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  282         }
  283         
  284 
  285 #ifdef ARM_USE_SMALL_ALLOC
  286         if ((freemem_after + 2 * PAGE_SIZE) <= afterkern) {
  287                 arm_add_smallalloc_pages((void *)(freemem_after),
  288                     (void*)(freemem_after + PAGE_SIZE),
  289                     afterkern - (freemem_after + PAGE_SIZE), 0);
  290                     
  291         }
  292 #endif
  293 
  294         /* Map the vector page. */
  295         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  296             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  297         pmap_devmap_bootstrap(l1pagetable, iq81342_devmap);
  298         /*
  299          * Give the XScale global cache clean code an appropriately
  300          * sized chunk of unmapped VA space starting at 0xff000000
  301          * (our device mappings end before this address).
  302          */
  303         xscale_cache_clean_addr = 0xff000000U;
  304 
  305         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  306         setttb(kernel_l1pt.pv_pa);
  307         cpu_tlb_flushID();
  308         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  309         /*
  310          * Pages were allocated during the secondary bootstrap for the
  311          * stacks for different CPU modes.
  312          * We must now set the r13 registers in the different CPU modes to
  313          * point to these stacks.
  314          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  315          * of the stack memory.
  316          */
  317 
  318                                    
  319         set_stackptr(PSR_IRQ32_MODE,
  320             irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
  321         set_stackptr(PSR_ABT32_MODE,
  322             abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
  323         set_stackptr(PSR_UND32_MODE,
  324             undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
  325 
  326 
  327 
  328         /*
  329          * We must now clean the cache again....
  330          * Cleaning may be done by reading new data to displace any
  331          * dirty data in the cache. This will have happened in setttb()
  332          * but since we are boot strapping the addresses used for the read
  333          * may have just been remapped and thus the cache could be out
  334          * of sync. A re-clean after the switch will cure this.
  335          * After booting there are no gross reloations of the kernel thus
  336          * this problem will not occur after initarm().
  337          */
  338         cpu_idcache_wbinv_all();
  339         i80321_calibrate_delay();
  340         i81342_sdram_bounds(&obio_bs_tag, IOP34X_VADDR, &memstart, &memsize);
  341         physmem = memsize / PAGE_SIZE;
  342         cninit();
  343         /* Set stack for exception handlers */
  344         
  345         data_abort_handler_address = (u_int)data_abort_handler;
  346         prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
  347         undefined_handler_address = (u_int)undefinedinstruction_bounce;
  348         undefined_init();
  349                                 
  350 #ifdef KSE
  351         proc_linkup(&proc0, &ksegrp0, &thread0);
  352 #else
  353         proc_linkup0(&proc0, &thread0);
  354 #endif
  355         thread0.td_kstack = kernelstack.pv_va;
  356         thread0.td_pcb = (struct pcb *)
  357                 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  358         thread0.td_pcb->pcb_flags = 0;
  359         thread0.td_frame = &proc0_tf;
  360         pcpup->pc_curpcb = thread0.td_pcb;
  361         
  362         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  363 
  364         pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
  365         /*
  366          * ARM_USE_SMALL_ALLOC uses dump_avail, so it must be filled before
  367          * calling pmap_bootstrap.
  368          */
  369         dump_avail[0] = 0x00000000;
  370         dump_avail[1] = 0x00000000 + memsize;
  371         dump_avail[2] = 0;
  372         dump_avail[3] = 0;
  373                                         
  374         pmap_bootstrap(pmap_curmaxkvaddr, 
  375             0xd0000000, &kernel_l1pt);
  376         msgbufp = (void*)msgbufpv.pv_va;
  377         msgbufinit(msgbufp, MSGBUF_SIZE);
  378         mutex_init();
  379         
  380         i = 0;
  381 #ifdef ARM_USE_SMALL_ALLOC
  382         phys_avail[i++] = 0x00000000;
  383         phys_avail[i++] = 0x00001000;   /*
  384                                          *XXX: Gross hack to get our
  385                                          * pages in the vm_page_array
  386                                          . */
  387 #endif
  388         phys_avail[i++] = round_page(virtual_avail - KERNBASE + SDRAM_START);
  389         phys_avail[i++] = trunc_page(0x00000000 + memsize - 1);
  390         phys_avail[i++] = 0;
  391         phys_avail[i] = 0;
  392         
  393         /* Do basic tuning, hz etc */
  394         init_param1();
  395         init_param2(physmem);
  396         kdb_init();
  397         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  398             sizeof(struct pcb)));
  399 }

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