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/sa11x0/assabet_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 
   49 #include <sys/cdefs.h>
   50 __FBSDID("$FreeBSD: releng/9.0/sys/arm/sa11x0/assabet_machdep.c 223562 2011-06-26 10:07:48Z kevlo $");
   51 
   52 #include "opt_md.h"
   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 <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 <machine/pmap.h>
   85 #include <machine/vmparam.h>
   86 #include <machine/pcb.h>
   87 #include <machine/undefined.h>
   88 #include <machine/machdep.h>
   89 #include <machine/metadata.h>
   90 #include <machine/armreg.h>
   91 #include <machine/bus.h>
   92 #include <sys/reboot.h>
   93 
   94 #include <arm/sa11x0/sa11x0_reg.h>
   95 
   96 #define MDROOT_ADDR 0xd0400000
   97 
   98 #define KERNEL_PT_VMEM          0       /* Page table for mapping video memory */
   99 #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
  100 #define KERNEL_PT_IO            3       /* Page table for mapping IO */
  101 #define KERNEL_PT_IRQ           2       /* Page table for mapping irq handler */
  102 #define KERNEL_PT_KERNEL        1       /* Page table for mapping kernel */
  103 #define KERNEL_PT_L1            4       /* Page table for mapping l1pt */
  104 #define KERNEL_PT_VMDATA        5       /* Page tables for mapping kernel VM */
  105 #define KERNEL_PT_VMDATA_NUM    7       /* start with 16MB of KVM */
  106 #define NUM_KERNEL_PTS          (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM)
  107 
  108 /* Define various stack sizes in pages */
  109 #define IRQ_STACK_SIZE  1
  110 #define ABT_STACK_SIZE  1
  111 #define UND_STACK_SIZE  1
  112 
  113 #define KERNEL_VM_BASE          (KERNBASE + 0x00100000)
  114 #define KERNEL_VM_SIZE          0x05000000
  115 
  116 extern u_int data_abort_handler_address;
  117 extern u_int prefetch_abort_handler_address;
  118 extern u_int undefined_handler_address;
  119 
  120 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  121 
  122 extern void *_end;
  123 
  124 extern vm_offset_t sa1110_uart_vaddr;
  125 
  126 extern vm_offset_t sa1_cache_clean_addr;
  127 
  128 extern int *end;
  129 
  130 struct pcpu __pcpu;
  131 struct pcpu *pcpup = &__pcpu;
  132 
  133 #ifndef MD_ROOT_SIZE
  134 #define MD_ROOT_SIZE 65535
  135 #endif
  136 /* Physical and virtual addresses for some global pages */
  137 
  138 vm_paddr_t phys_avail[10];
  139 vm_paddr_t dump_avail[4];
  140 vm_paddr_t physical_start;
  141 vm_paddr_t physical_end;
  142 vm_paddr_t physical_freestart;
  143 vm_offset_t physical_pages;
  144 
  145 struct pv_addr systempage;
  146 struct pv_addr irqstack;
  147 struct pv_addr undstack;
  148 struct pv_addr abtstack;
  149 struct pv_addr kernelstack;
  150 static struct trapframe proc0_tf;
  151 
  152 /* Static device mappings. */
  153 static const struct pmap_devmap assabet_devmap[] = {
  154         /*
  155          * Map the on-board devices VA == PA so that we can access them
  156          * with the MMU on or off.
  157          */
  158         {
  159                 SACOM1_VBASE,
  160                 SACOM1_BASE,
  161                 SACOM1_SIZE,
  162                 VM_PROT_READ|VM_PROT_WRITE,
  163                 PTE_NOCACHE,
  164         },
  165         {
  166                 SAIPIC_BASE,
  167                 SAIPIC_BASE,
  168                 SAIPIC_SIZE,
  169                 VM_PROT_READ|VM_PROT_WRITE,
  170                 PTE_NOCACHE,
  171         },
  172         {
  173                 0,
  174                 0,
  175                 0,
  176                 0,
  177                 0,
  178         }
  179 };
  180 
  181 struct arm32_dma_range *
  182 bus_dma_get_range(void)
  183 {
  184 
  185         return (NULL);
  186 }
  187 
  188 int
  189 bus_dma_get_range_nb(void)
  190 {
  191         return (0);
  192 }
  193 
  194 void
  195 cpu_reset()
  196 {
  197         cpu_halt();
  198         while (1);
  199 }
  200 
  201 #define CPU_SA110_CACHE_CLEAN_SIZE (0x4000 * 2)
  202 
  203 void *
  204 initarm(void *arg, void *arg2)
  205 {
  206         struct pcpu *pc;
  207         struct pv_addr  kernel_l1pt;
  208         struct pv_addr  md_addr;
  209         struct pv_addr  md_bla;
  210         struct pv_addr  dpcpu;
  211         int loop;
  212         u_int l1pagetable;
  213         vm_offset_t freemempos;
  214         vm_offset_t lastalloced;
  215         vm_offset_t lastaddr;
  216         uint32_t memsize = 32 * 1024 * 1024;
  217         sa1110_uart_vaddr = SACOM1_VBASE;
  218 
  219         boothowto = RB_VERBOSE | RB_SINGLE;
  220         cninit();
  221         set_cpufuncs();
  222         lastaddr = fake_preload_metadata();
  223         physmem = memsize / PAGE_SIZE;
  224         pc = &__pcpu;
  225         pcpu_init(pc, 0, sizeof(struct pcpu));
  226         PCPU_SET(curthread, &thread0);
  227 
  228         /* Do basic tuning, hz etc */
  229         init_param1();
  230                 
  231         physical_start = (vm_offset_t) KERNBASE;
  232         physical_end =  lastaddr;
  233         physical_freestart = (((vm_offset_t)physical_end) + PAGE_MASK) & ~PAGE_MASK;
  234         md_addr.pv_va = md_addr.pv_pa = MDROOT_ADDR;
  235         freemempos = (vm_offset_t)round_page(physical_freestart);
  236         memset((void *)freemempos, 0, 256*1024);
  237                 /* Define a macro to simplify memory allocation */
  238 #define valloc_pages(var, np)                   \
  239         alloc_pages((var).pv_pa, (np));         \
  240         (var).pv_va = (var).pv_pa;
  241 
  242 #define alloc_pages(var, np)                    \
  243         (var) = freemempos;             \
  244         freemempos += ((np) * PAGE_SIZE);\
  245         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  246 
  247         while ((freemempos & (L1_TABLE_SIZE - 1)) != 0)
  248                 freemempos += PAGE_SIZE;
  249         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  250         valloc_pages(md_bla, L2_TABLE_SIZE / PAGE_SIZE);
  251         alloc_pages(sa1_cache_clean_addr, CPU_SA110_CACHE_CLEAN_SIZE / PAGE_SIZE);
  252 
  253         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  254                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  255                         valloc_pages(kernel_pt_table[loop],
  256                             L2_TABLE_SIZE / PAGE_SIZE);
  257                 } else {
  258                         kernel_pt_table[loop].pv_pa = freemempos +
  259                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  260                             L2_TABLE_SIZE_REAL;
  261                         kernel_pt_table[loop].pv_va = 
  262                             kernel_pt_table[loop].pv_pa;
  263                 }
  264         }
  265 
  266         /*
  267          * Allocate a page for the system page mapped to V0x00000000
  268          * This page will just contain the system vectors and can be
  269          * shared by all processes.
  270          */
  271         valloc_pages(systempage, 1);
  272 
  273         /* Allocate dynamic per-cpu area. */
  274         valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
  275         dpcpu_init((void *)dpcpu.pv_va, 0);
  276 
  277         /* Allocate stacks for all modes */
  278         valloc_pages(irqstack, IRQ_STACK_SIZE);
  279         valloc_pages(abtstack, ABT_STACK_SIZE);
  280         valloc_pages(undstack, UND_STACK_SIZE);
  281         valloc_pages(kernelstack, KSTACK_PAGES);
  282         lastalloced = kernelstack.pv_va;
  283 
  284         /*
  285          * Allocate memory for the l1 and l2 page tables. The scheme to avoid
  286          * wasting memory by allocating the l1pt on the first 16k memory was
  287          * taken from NetBSD rpc_machdep.c. NKPT should be greater than 12 for
  288          * this to work (which is supposed to be the case).
  289          */
  290 
  291         /*
  292          * Now we start construction of the L1 page table
  293          * We start by mapping the L2 page tables into the L1.
  294          * This means that we can replace L1 mappings later on if necessary
  295          */
  296         l1pagetable = kernel_l1pt.pv_pa;
  297 
  298 
  299         /* Map the L2 pages tables in the L1 page table */
  300         pmap_link_l2pt(l1pagetable, 0x00000000,
  301             &kernel_pt_table[KERNEL_PT_SYS]);
  302         pmap_link_l2pt(l1pagetable, KERNBASE,
  303             &kernel_pt_table[KERNEL_PT_KERNEL]);
  304         pmap_link_l2pt(l1pagetable, 0xd0000000,
  305             &kernel_pt_table[KERNEL_PT_IO]);
  306         pmap_link_l2pt(l1pagetable, lastalloced & ~((L1_S_SIZE * 4) - 1),
  307             &kernel_pt_table[KERNEL_PT_L1]);
  308         pmap_link_l2pt(l1pagetable, 0x90000000, &kernel_pt_table[KERNEL_PT_IRQ]);
  309         pmap_link_l2pt(l1pagetable, MDROOT_ADDR,
  310             &md_bla);
  311         for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; ++loop)
  312                 pmap_link_l2pt(l1pagetable, KERNEL_VM_BASE + loop * 0x00100000,
  313                     &kernel_pt_table[KERNEL_PT_VMDATA + loop]);
  314         pmap_map_chunk(l1pagetable, KERNBASE, KERNBASE,
  315             ((uint32_t)lastaddr - KERNBASE), VM_PROT_READ|VM_PROT_WRITE,
  316             PTE_CACHE);
  317         /* Map the DPCPU pages */
  318         pmap_map_chunk(l1pagetable, dpcpu.pv_va, dpcpu.pv_pa, DPCPU_SIZE,
  319             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  320         /* Map the stack pages */
  321         pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa,
  322             IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  323         pmap_map_chunk(l1pagetable, md_addr.pv_va, md_addr.pv_pa,
  324             MD_ROOT_SIZE * 1024, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  325         pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
  326             ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  327         pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
  328             UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  329         pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
  330             KSTACK_PAGES * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  331 
  332         pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
  333             L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  334 
  335         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  336                 pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va,
  337                     kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE,
  338                     VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  339         }
  340         pmap_map_chunk(l1pagetable, md_bla.pv_va, md_bla.pv_pa, L2_TABLE_SIZE,
  341             VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  342         /* Map the vector page. */
  343         pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
  344             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  345         /* Map the statically mapped devices. */
  346         pmap_devmap_bootstrap(l1pagetable, assabet_devmap);
  347         pmap_map_chunk(l1pagetable, sa1_cache_clean_addr, 0xf0000000, 
  348             CPU_SA110_CACHE_CLEAN_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  349 
  350         data_abort_handler_address = (u_int)data_abort_handler;
  351         prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
  352         undefined_handler_address = (u_int)undefinedinstruction_bounce;
  353         undefined_init();
  354         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  355         setttb(kernel_l1pt.pv_pa);
  356         cpu_tlb_flushID();
  357         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  358 
  359         /*
  360          * Pages were allocated during the secondary bootstrap for the
  361          * stacks for different CPU modes.
  362          * We must now set the r13 registers in the different CPU modes to
  363          * point to these stacks.
  364          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  365          * of the stack memory.
  366          */
  367         set_stackptr(PSR_IRQ32_MODE,
  368             irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
  369         set_stackptr(PSR_ABT32_MODE,
  370             abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
  371         set_stackptr(PSR_UND32_MODE,
  372             undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
  373 
  374         /*
  375          * We must now clean the cache again....
  376          * Cleaning may be done by reading new data to displace any
  377          * dirty data in the cache. This will have happened in setttb()
  378          * but since we are boot strapping the addresses used for the read
  379          * may have just been remapped and thus the cache could be out
  380          * of sync. A re-clean after the switch will cure this.
  381          * After booting there are no gross relocations of the kernel thus
  382          * this problem will not occur after initarm().
  383          */
  384         cpu_idcache_wbinv_all();
  385 
  386         bootverbose = 1;
  387 
  388         /* Set stack for exception handlers */
  389         
  390         proc_linkup0(&proc0, &thread0);
  391         thread0.td_kstack = kernelstack.pv_va;
  392         thread0.td_pcb = (struct pcb *)
  393                 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  394         thread0.td_pcb->pcb_flags = 0;
  395         thread0.td_frame = &proc0_tf;
  396         
  397         
  398         /* Enable MMU, I-cache, D-cache, write buffer. */
  399 
  400         cpufunc_control(0x337f, 0x107d);
  401         arm_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL);
  402 
  403         pmap_curmaxkvaddr = freemempos + KERNEL_PT_VMDATA_NUM * 0x400000;
  404 
  405         dump_avail[0] = phys_avail[0] = round_page(virtual_avail);
  406         dump_avail[1] = phys_avail[1] = 0xc0000000 + 0x02000000 - 1;
  407         dump_avail[2] = phys_avail[2] = 0;
  408         dump_avail[3] = phys_avail[3] = 0;
  409                                         
  410         mutex_init();
  411         pmap_bootstrap(freemempos, 0xd0000000, &kernel_l1pt);
  412 
  413         init_param2(physmem);
  414         kdb_init();
  415         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  416             sizeof(struct pcb)));
  417 }

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This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.