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/10.4/sys/arm/xscale/i8134x/crb_machdep.c 278727 2015-02-13 22:32:02Z ian $");
   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/devmap.h>
   82 #include <machine/vmparam.h>
   83 #include <machine/pcb.h>
   84 #include <machine/undefined.h>
   85 #include <machine/machdep.h>
   86 #include <machine/metadata.h>
   87 #include <machine/armreg.h>
   88 #include <machine/bus.h>
   89 #include <machine/physmem.h>
   90 #include <sys/reboot.h>
   91 
   92 
   93 #include <arm/xscale/i80321/i80321var.h> /* For i80321_calibrate_delay() */
   94 
   95 #include <arm/xscale/i8134x/i81342reg.h>
   96 #include <arm/xscale/i8134x/i81342var.h>
   97 #include <arm/xscale/i8134x/obiovar.h>
   98 
   99 
  100 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
  101 #define KERNEL_PT_IOPXS         1
  102 #define KERNEL_PT_BEFOREKERN    2
  103 #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
  104 #define KERNEL_PT_AFKERNEL_NUM  9
  105 
  106 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
  107 #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
  108 
  109 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  110 
  111 /* Physical and virtual addresses for some global pages */
  112 
  113 struct pv_addr systempage;
  114 struct pv_addr msgbufpv;
  115 struct pv_addr irqstack;
  116 struct pv_addr undstack;
  117 struct pv_addr abtstack;
  118 struct pv_addr kernelstack;
  119 
  120 /* Static device mappings. */
  121 static const struct arm_devmap_entry iq81342_devmap[] = {
  122             {
  123                     IOP34X_VADDR,
  124                     IOP34X_HWADDR,
  125                     IOP34X_SIZE,
  126                     VM_PROT_READ|VM_PROT_WRITE,
  127                     PTE_DEVICE,
  128             },
  129             {
  130                     /*
  131                      * Cheat and map a whole section, this will bring
  132                      * both PCI-X and PCI-E outbound I/O
  133                      */
  134                     IOP34X_PCIX_OIOBAR_VADDR &~ (0x100000 - 1),
  135                     IOP34X_PCIX_OIOBAR &~ (0x100000 - 1),
  136                     0x100000,
  137                     VM_PROT_READ|VM_PROT_WRITE,
  138                     PTE_DEVICE,
  139             },
  140             {
  141                     IOP34X_PCE1_VADDR,
  142                     IOP34X_PCE1,
  143                     IOP34X_PCE1_SIZE,
  144                     VM_PROT_READ|VM_PROT_WRITE,
  145                     PTE_DEVICE,
  146             },
  147             {   
  148                     0,
  149                     0,
  150                     0,
  151                     0,
  152                     0,
  153             }
  154 };
  155 
  156 #define SDRAM_START 0x00000000
  157 
  158 extern vm_offset_t xscale_cache_clean_addr;
  159 
  160 void *
  161 initarm(struct arm_boot_params *abp)
  162 {
  163         struct pv_addr  kernel_l1pt;
  164         struct pv_addr  dpcpu;
  165         int loop, i;
  166         u_int l1pagetable;
  167         vm_offset_t freemempos;
  168         vm_offset_t freemem_pt;
  169         vm_offset_t afterkern;
  170         vm_offset_t freemem_after;
  171         vm_offset_t lastaddr;
  172         uint32_t memsize, memstart;
  173 
  174         lastaddr = parse_boot_param(abp);
  175         arm_physmem_kernaddr = abp->abp_physaddr;
  176         set_cpufuncs();
  177         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  178         PCPU_SET(curthread, &thread0);
  179 
  180         /* Do basic tuning, hz etc */
  181         init_param1();
  182 
  183         freemempos = 0x00200000;
  184         /* Define a macro to simplify memory allocation */
  185 #define valloc_pages(var, np)                   \
  186         alloc_pages((var).pv_pa, (np));         \
  187         (var).pv_va = (var).pv_pa + 0xc0000000;
  188 
  189 #define alloc_pages(var, np)                    \
  190         freemempos -= (np * PAGE_SIZE);         \
  191         (var) = freemempos;             \
  192         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  193 
  194         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  195                 freemempos -= PAGE_SIZE;
  196         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  197         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  198                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  199                         valloc_pages(kernel_pt_table[loop],
  200                             L2_TABLE_SIZE / PAGE_SIZE);
  201                 } else {
  202                         kernel_pt_table[loop].pv_pa = freemempos +
  203                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  204                             L2_TABLE_SIZE_REAL;
  205                         kernel_pt_table[loop].pv_va =
  206                             kernel_pt_table[loop].pv_pa + 0xc0000000;
  207                 }
  208         }
  209         freemem_pt = freemempos;
  210         freemempos = 0x00100000;
  211         /*
  212          * Allocate a page for the system page mapped to V0x00000000
  213          * This page will just contain the system vectors and can be
  214          * shared by all processes.
  215          */
  216         valloc_pages(systempage, 1);
  217 
  218         /* Allocate dynamic per-cpu area. */
  219         valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
  220         dpcpu_init((void *)dpcpu.pv_va, 0);
  221 
  222         /* Allocate stacks for all modes */
  223         valloc_pages(irqstack, IRQ_STACK_SIZE);
  224         valloc_pages(abtstack, ABT_STACK_SIZE);
  225         valloc_pages(undstack, UND_STACK_SIZE);
  226         valloc_pages(kernelstack, KSTACK_PAGES);
  227         valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
  228         /*
  229          * Now we start construction of the L1 page table
  230          * We start by mapping the L2 page tables into the L1.
  231          * This means that we can replace L1 mappings later on if necessary
  232          */
  233         l1pagetable = kernel_l1pt.pv_va;
  234 
  235         /* Map the L2 pages tables in the L1 page table */
  236         pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH & ~(0x00100000 - 1),
  237             &kernel_pt_table[KERNEL_PT_SYS]);
  238         pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
  239             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  240 
  241         pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
  242             0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  243 
  244         pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
  245            (((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE) & ~(L1_S_SIZE - 1),
  246             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  247         freemem_after = ((int)lastaddr + PAGE_SIZE) & ~(PAGE_SIZE - 1);
  248         afterkern = round_page(((vm_offset_t)lastaddr + L1_S_SIZE) & ~(L1_S_SIZE
  249             - 1));
  250         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  251                 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
  252                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  253         }
  254         
  255 
  256         /* Map the vector page. */
  257         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  258             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  259         arm_devmap_bootstrap(l1pagetable, iq81342_devmap);
  260         /*
  261          * Give the XScale global cache clean code an appropriately
  262          * sized chunk of unmapped VA space starting at 0xff000000
  263          * (our device mappings end before this address).
  264          */
  265         xscale_cache_clean_addr = 0xff000000U;
  266 
  267         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  268         setttb(kernel_l1pt.pv_pa);
  269         cpu_tlb_flushID();
  270         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  271         /*
  272          * Pages were allocated during the secondary bootstrap for the
  273          * stacks for different CPU modes.
  274          * We must now set the r13 registers in the different CPU modes to
  275          * point to these stacks.
  276          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  277          * of the stack memory.
  278          */
  279 
  280         set_stackptrs(0);
  281 
  282         /*
  283          * We must now clean the cache again....
  284          * Cleaning may be done by reading new data to displace any
  285          * dirty data in the cache. This will have happened in setttb()
  286          * but since we are boot strapping the addresses used for the read
  287          * may have just been remapped and thus the cache could be out
  288          * of sync. A re-clean after the switch will cure this.
  289          * After booting there are no gross relocations of the kernel thus
  290          * this problem will not occur after initarm().
  291          */
  292         cpu_idcache_wbinv_all();
  293         cpu_setup("");
  294 
  295         i80321_calibrate_delay();
  296         i81342_sdram_bounds(obio_bs_tag, IOP34X_VADDR, &memstart, &memsize);
  297         physmem = memsize / PAGE_SIZE;
  298         cninit();
  299         /* Set stack for exception handlers */
  300         
  301         undefined_init();
  302                                 
  303         init_proc0(kernelstack.pv_va);
  304         
  305         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  306 
  307         pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
  308 
  309         vm_max_kernel_address = 0xd0000000;
  310         pmap_bootstrap(pmap_curmaxkvaddr, &kernel_l1pt);
  311         msgbufp = (void*)msgbufpv.pv_va;
  312         msgbufinit(msgbufp, msgbufsize);
  313         mutex_init();
  314 
  315         /*
  316          * Add the physical ram we have available.
  317          *
  318          * Exclude the kernel (and all the things we allocated which immediately
  319          * follow the kernel) from the VM allocation pool but not from crash
  320          * dumps.  virtual_avail is a global variable which tracks the kva we've
  321          * "allocated" while setting up pmaps.
  322          *
  323          * Prepare the list of physical memory available to the vm subsystem.
  324          */
  325         arm_physmem_hardware_region(SDRAM_START, memsize);
  326         arm_physmem_exclude_region(abp->abp_physaddr, 
  327             virtual_avail - KERNVIRTADDR, EXFLAG_NOALLOC);
  328         arm_physmem_init_kernel_globals();
  329 
  330         init_param2(physmem);
  331         kdb_init();
  332         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  333             sizeof(struct pcb)));
  334 }

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