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 dependent 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/11.0/sys/arm/xscale/i8134x/crb_machdep.c 299069 2016-05-04 15:48:59Z pfg $");
   50 
   51 #include "opt_kstack_pages.h"
   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 <sys/devmap.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_object.h>
   82 #include <vm/vm_page.h>
   83 #include <vm/vm_map.h>
   84 #include <machine/vmparam.h>
   85 #include <machine/pcb.h>
   86 #include <machine/undefined.h>
   87 #include <machine/machdep.h>
   88 #include <machine/metadata.h>
   89 #include <machine/armreg.h>
   90 #include <machine/bus.h>
   91 #include <machine/physmem.h>
   92 #include <sys/reboot.h>
   93 
   94 
   95 #include <arm/xscale/i8134x/i80321var.h> /* For i80321_calibrate_delay() */
   96 
   97 #include <arm/xscale/i8134x/i81342reg.h>
   98 #include <arm/xscale/i8134x/i81342var.h>
   99 #include <arm/xscale/i8134x/obiovar.h>
  100 
  101 
  102 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
  103 #define KERNEL_PT_IOPXS         1
  104 #define KERNEL_PT_BEFOREKERN    2
  105 #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
  106 #define KERNEL_PT_AFKERNEL_NUM  9
  107 
  108 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
  109 #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
  110 
  111 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  112 
  113 /* Physical and virtual addresses for some global pages */
  114 
  115 struct pv_addr systempage;
  116 struct pv_addr msgbufpv;
  117 struct pv_addr irqstack;
  118 struct pv_addr undstack;
  119 struct pv_addr abtstack;
  120 struct pv_addr kernelstack;
  121 
  122 /* Static device mappings. */
  123 static const struct devmap_entry iq81342_devmap[] = {
  124             {
  125                     IOP34X_VADDR,
  126                     IOP34X_HWADDR,
  127                     IOP34X_SIZE,
  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                     rounddown2(IOP34X_PCIX_OIOBAR_VADDR, 0x100000),
  135                     rounddown2(IOP34X_PCIX_OIOBAR, 0x100000),
  136                     0x100000,
  137             },
  138             {
  139                     IOP34X_PCE1_VADDR,
  140                     IOP34X_PCE1,
  141                     IOP34X_PCE1_SIZE,
  142             },
  143             {   
  144                     0,
  145                     0,
  146                     0,
  147             }
  148 };
  149 
  150 #define SDRAM_START 0x00000000
  151 
  152 extern vm_offset_t xscale_cache_clean_addr;
  153 
  154 void *
  155 initarm(struct arm_boot_params *abp)
  156 {
  157         struct pv_addr  kernel_l1pt;
  158         struct pv_addr  dpcpu;
  159         int loop, i;
  160         u_int l1pagetable;
  161         vm_offset_t freemempos;
  162         vm_offset_t freemem_pt;
  163         vm_offset_t afterkern;
  164         vm_offset_t freemem_after;
  165         vm_offset_t lastaddr;
  166         uint32_t memsize, memstart;
  167 
  168         lastaddr = parse_boot_param(abp);
  169         arm_physmem_kernaddr = abp->abp_physaddr;
  170         set_cpufuncs();
  171         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  172         PCPU_SET(curthread, &thread0);
  173 
  174         /* Do basic tuning, hz etc */
  175         init_param1();
  176 
  177         freemempos = 0x00200000;
  178         /* Define a macro to simplify memory allocation */
  179 #define valloc_pages(var, np)                   \
  180         alloc_pages((var).pv_pa, (np));         \
  181         (var).pv_va = (var).pv_pa + 0xc0000000;
  182 
  183 #define alloc_pages(var, np)                    \
  184         freemempos -= (np * PAGE_SIZE);         \
  185         (var) = freemempos;             \
  186         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  187 
  188         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  189                 freemempos -= PAGE_SIZE;
  190         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  191         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  192                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  193                         valloc_pages(kernel_pt_table[loop],
  194                             L2_TABLE_SIZE / PAGE_SIZE);
  195                 } else {
  196                         kernel_pt_table[loop].pv_pa = freemempos +
  197                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  198                             L2_TABLE_SIZE_REAL;
  199                         kernel_pt_table[loop].pv_va =
  200                             kernel_pt_table[loop].pv_pa + 0xc0000000;
  201                 }
  202         }
  203         freemem_pt = freemempos;
  204         freemempos = 0x00100000;
  205         /*
  206          * Allocate a page for the system page mapped to V0x00000000
  207          * This page will just contain the system vectors and can be
  208          * shared by all processes.
  209          */
  210         valloc_pages(systempage, 1);
  211 
  212         /* Allocate dynamic per-cpu area. */
  213         valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
  214         dpcpu_init((void *)dpcpu.pv_va, 0);
  215 
  216         /* Allocate stacks for all modes */
  217         valloc_pages(irqstack, IRQ_STACK_SIZE);
  218         valloc_pages(abtstack, ABT_STACK_SIZE);
  219         valloc_pages(undstack, UND_STACK_SIZE);
  220         valloc_pages(kernelstack, kstack_pages);
  221         valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
  222         /*
  223          * Now we start construction of the L1 page table
  224          * We start by mapping the L2 page tables into the L1.
  225          * This means that we can replace L1 mappings later on if necessary
  226          */
  227         l1pagetable = kernel_l1pt.pv_va;
  228 
  229         /* Map the L2 pages tables in the L1 page table */
  230         pmap_link_l2pt(l1pagetable, rounddown2(ARM_VECTORS_HIGH, 0x00100000),
  231                        &kernel_pt_table[KERNEL_PT_SYS]);
  232         pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
  233             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  234 
  235         pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
  236             0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  237 
  238         pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
  239            rounddown2(((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE, L1_S_SIZE),
  240            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  241         freemem_after = rounddown2((int)lastaddr + PAGE_SIZE, PAGE_SIZE);
  242         afterkern = round_page(rounddown2((vm_offset_t)lastaddr + L1_S_SIZE, L1_S_SIZE));
  243         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  244                 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
  245                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  246         }
  247         
  248 
  249         /* Map the vector page. */
  250         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  251             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  252         devmap_bootstrap(l1pagetable, iq81342_devmap);
  253         /*
  254          * Give the XScale global cache clean code an appropriately
  255          * sized chunk of unmapped VA space starting at 0xff000000
  256          * (our device mappings end before this address).
  257          */
  258         xscale_cache_clean_addr = 0xff000000U;
  259 
  260         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  261         cpu_setttb(kernel_l1pt.pv_pa);
  262         cpu_tlb_flushID();
  263         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  264         /*
  265          * Pages were allocated during the secondary bootstrap for the
  266          * stacks for different CPU modes.
  267          * We must now set the r13 registers in the different CPU modes to
  268          * point to these stacks.
  269          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  270          * of the stack memory.
  271          */
  272 
  273         set_stackptrs(0);
  274 
  275         /*
  276          * We must now clean the cache again....
  277          * Cleaning may be done by reading new data to displace any
  278          * dirty data in the cache. This will have happened in cpu_setttb()
  279          * but since we are boot strapping the addresses used for the read
  280          * may have just been remapped and thus the cache could be out
  281          * of sync. A re-clean after the switch will cure this.
  282          * After booting there are no gross relocations of the kernel thus
  283          * this problem will not occur after initarm().
  284          */
  285         cpu_idcache_wbinv_all();
  286         cpu_setup();
  287 
  288         i80321_calibrate_delay();
  289         i81342_sdram_bounds(obio_bs_tag, IOP34X_VADDR, &memstart, &memsize);
  290         physmem = memsize / PAGE_SIZE;
  291         cninit();
  292         /* Set stack for exception handlers */
  293         
  294         undefined_init();
  295                                 
  296         init_proc0(kernelstack.pv_va);
  297         
  298         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  299 
  300         pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
  301 
  302         vm_max_kernel_address = 0xe0000000;
  303         pmap_bootstrap(pmap_curmaxkvaddr, &kernel_l1pt);
  304         msgbufp = (void*)msgbufpv.pv_va;
  305         msgbufinit(msgbufp, msgbufsize);
  306         mutex_init();
  307 
  308         /*
  309          * Add the physical ram we have available.
  310          *
  311          * Exclude the kernel (and all the things we allocated which immediately
  312          * follow the kernel) from the VM allocation pool but not from crash
  313          * dumps.  virtual_avail is a global variable which tracks the kva we've
  314          * "allocated" while setting up pmaps.
  315          *
  316          * Prepare the list of physical memory available to the vm subsystem.
  317          */
  318         arm_physmem_hardware_region(SDRAM_START, memsize);
  319         arm_physmem_exclude_region(freemem_pt, abp->abp_physaddr -
  320             freemem_pt, EXFLAG_NOALLOC);
  321         arm_physmem_exclude_region(freemempos, abp->abp_physaddr - 0x100000 -
  322             freemempos, EXFLAG_NOALLOC);
  323         arm_physmem_exclude_region(abp->abp_physaddr, 
  324             virtual_avail - KERNVIRTADDR, EXFLAG_NOALLOC);
  325         arm_physmem_init_kernel_globals();
  326 
  327         init_param2(physmem);
  328         kdb_init();
  329         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  330             sizeof(struct pcb)));
  331 }

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