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/econa/econa_machdep.c

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    1 /*-
    2  * Copyright (c) 2009 Yohanes Nugroho <yohanes@gmail.com>
    3  * Copyright (c) 1994-1998 Mark Brinicombe.
    4  * Copyright (c) 1994 Brini.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software written for Brini by Mark Brinicombe
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by Brini.
   20  * 4. The name of the company nor the name of the author may be used to
   21  *    endorse or promote products derived from this software without specific
   22  *    prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
   25  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   28  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   29  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   30  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/9.0/sys/arm/econa/econa_machdep.c 218666 2011-02-13 20:02:46Z cognet $");
   40 
   41 #define _ARM32_BUS_DMA_PRIVATE
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/sysproto.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/imgact.h>
   47 #include <sys/kernel.h>
   48 #include <sys/ktr.h>
   49 #include <sys/linker.h>
   50 #include <sys/lock.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mutex.h>
   53 #include <sys/pcpu.h>
   54 #include <sys/proc.h>
   55 #include <sys/ptrace.h>
   56 #include <sys/cons.h>
   57 #include <sys/bio.h>
   58 #include <sys/bus.h>
   59 #include <sys/buf.h>
   60 #include <sys/exec.h>
   61 #include <sys/kdb.h>
   62 #include <sys/msgbuf.h>
   63 #include <machine/reg.h>
   64 #include <machine/cpu.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/pmap.h>
   68 #include <vm/vm_object.h>
   69 #include <vm/vm_page.h>
   70 #include <vm/vm_pager.h>
   71 #include <vm/vm_map.h>
   72 #include <vm/vnode_pager.h>
   73 #include <machine/pmap.h>
   74 #include <machine/vmparam.h>
   75 #include <machine/pcb.h>
   76 #include <machine/undefined.h>
   77 #include <machine/machdep.h>
   78 #include <machine/metadata.h>
   79 #include <machine/armreg.h>
   80 #include <machine/bus.h>
   81 #include <sys/reboot.h>
   82 #include "econa_reg.h"
   83 
   84 /* Page table for mapping proc0 zero page */
   85 #define KERNEL_PT_SYS           0
   86 #define KERNEL_PT_KERN          1
   87 #define KERNEL_PT_KERN_NUM      22
   88 /* L2 table for mapping after kernel */
   89 #define KERNEL_PT_AFKERNEL      KERNEL_PT_KERN + KERNEL_PT_KERN_NUM
   90 #define KERNEL_PT_AFKERNEL_NUM  5
   91 
   92 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
   93 #define NUM_KERNEL_PTS  (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
   94 
   95 /* Define various stack sizes in pages */
   96 #define IRQ_STACK_SIZE  1
   97 #define ABT_STACK_SIZE  1
   98 #define UND_STACK_SIZE  1
   99 
  100 extern u_int data_abort_handler_address;
  101 extern u_int prefetch_abort_handler_address;
  102 extern u_int undefined_handler_address;
  103 
  104 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
  105 
  106 extern void *_end;
  107 
  108 extern int *end;
  109 
  110 struct pcpu __pcpu;
  111 struct pcpu *pcpup = &__pcpu;
  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 vm_offset_t physical_pages;
  118 
  119 struct pv_addr systempage;
  120 struct pv_addr msgbufpv;
  121 struct pv_addr irqstack;
  122 struct pv_addr undstack;
  123 struct pv_addr abtstack;
  124 struct pv_addr kernelstack;
  125 
  126 static void *boot_arg1;
  127 static void *boot_arg2;
  128 
  129 static struct trapframe proc0_tf;
  130 
  131 /* Static device mappings. */
  132 static const struct pmap_devmap econa_devmap[] = {
  133         {
  134                 /*
  135                  * This maps DDR SDRAM
  136                  */
  137                 ECONA_SDRAM_BASE, /*virtual*/
  138                 ECONA_SDRAM_BASE, /*physical*/
  139                 ECONA_SDRAM_SIZE, /*size*/
  140                 VM_PROT_READ|VM_PROT_WRITE,
  141                 PTE_NOCACHE,
  142         },
  143         /*
  144          * Map the on-board devices VA == PA so that we can access them
  145          * with the MMU on or off.
  146          */
  147         {
  148                 /*
  149                  * This maps the interrupt controller, the UART
  150                  * and the timer.
  151                  */
  152                 ECONA_IO_BASE, /*virtual*/
  153                 ECONA_IO_BASE, /*physical*/
  154                 ECONA_IO_SIZE, /*size*/
  155                 VM_PROT_READ|VM_PROT_WRITE,
  156                 PTE_NOCACHE,
  157         },
  158         {
  159                 /*
  160                  * OHCI + EHCI
  161                  */
  162                 ECONA_OHCI_VBASE, /*virtual*/
  163                 ECONA_OHCI_PBASE, /*physical*/
  164                 ECONA_USB_SIZE, /*size*/
  165                 VM_PROT_READ|VM_PROT_WRITE,
  166                 PTE_NOCACHE,
  167         },
  168         {
  169                 /*
  170                  * CFI
  171                  */
  172                 ECONA_CFI_VBASE, /*virtual*/
  173                 ECONA_CFI_PBASE, /*physical*/
  174                 ECONA_CFI_SIZE,
  175                 VM_PROT_READ|VM_PROT_WRITE,
  176                 PTE_NOCACHE,
  177         },
  178         {
  179                 0,
  180                 0,
  181                 0,
  182                 0,
  183                 0,
  184         }
  185 };
  186 
  187 
  188 void *
  189 initarm(void *arg, void *arg2)
  190 {
  191         struct pv_addr  kernel_l1pt;
  192         volatile uint32_t * ddr = (uint32_t *)0x4000000C;
  193         int loop, i;
  194         u_int l1pagetable;
  195         vm_offset_t afterkern;
  196         vm_offset_t freemempos;
  197         vm_offset_t lastaddr;
  198         uint32_t memsize;
  199         int mem_info;
  200 
  201 
  202         boot_arg1 = arg;
  203         boot_arg2 = arg2;
  204         boothowto = RB_VERBOSE;
  205 
  206         set_cpufuncs();
  207         lastaddr = fake_preload_metadata();
  208         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  209         PCPU_SET(curthread, &thread0);
  210 
  211         /* Do basic tuning, hz etc */
  212         init_param1();
  213                 
  214 
  215         freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;
  216         /* Define a macro to simplify memory allocation */
  217 #define valloc_pages(var, np)                   \
  218         alloc_pages((var).pv_va, (np));         \
  219         (var).pv_pa = (var).pv_va + (KERNPHYSADDR - KERNVIRTADDR);
  220 
  221 #define alloc_pages(var, np)                    \
  222         (var) = freemempos;             \
  223         freemempos += (np * PAGE_SIZE);         \
  224         memset((char *)(var), 0, ((np) * PAGE_SIZE));
  225 
  226         while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
  227                 freemempos += PAGE_SIZE;
  228         valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
  229         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  230                 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
  231                         valloc_pages(kernel_pt_table[loop],
  232                             L2_TABLE_SIZE / PAGE_SIZE);
  233                 } else {
  234                         kernel_pt_table[loop].pv_va = freemempos -
  235                             (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
  236                             L2_TABLE_SIZE_REAL;
  237                         kernel_pt_table[loop].pv_pa =
  238                             kernel_pt_table[loop].pv_va - KERNVIRTADDR +
  239                             KERNPHYSADDR;
  240                 }
  241                 i++;
  242         }
  243         /*
  244          * Allocate a page for the system page mapped to V0x00000000
  245          * This page will just contain the system vectors and can be
  246          * shared by all processes.
  247          */
  248         valloc_pages(systempage, 1);
  249 
  250         /* Allocate stacks for all modes */
  251         valloc_pages(irqstack, IRQ_STACK_SIZE);
  252         valloc_pages(abtstack, ABT_STACK_SIZE);
  253         valloc_pages(undstack, UND_STACK_SIZE);
  254         valloc_pages(kernelstack, KSTACK_PAGES);
  255         valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
  256 
  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,
  266             &kernel_pt_table[KERNEL_PT_SYS]);
  267         for (i = 0; i < KERNEL_PT_KERN_NUM; i++)
  268                 pmap_link_l2pt(l1pagetable, KERNBASE + i * L1_S_SIZE,
  269                     &kernel_pt_table[KERNEL_PT_KERN + i]);
  270         pmap_map_chunk(l1pagetable, KERNBASE, PHYSADDR,
  271            (((uint32_t)lastaddr - KERNBASE) + PAGE_SIZE) & ~(PAGE_SIZE - 1),
  272             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  273         afterkern = round_page((lastaddr + L1_S_SIZE) & ~(L1_S_SIZE - 1));
  274         for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
  275                 pmap_link_l2pt(l1pagetable, afterkern + i * L1_S_SIZE,
  276                     &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
  277         }
  278 
  279         /* Map the vector page. */
  280         pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
  281             VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  282 
  283 
  284         /* Map the stack pages */
  285         pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa,
  286             IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  287         pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
  288             ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  289         pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
  290             UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  291         pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
  292             KSTACK_PAGES * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  293 
  294         pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
  295             L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  296         pmap_map_chunk(l1pagetable, msgbufpv.pv_va, msgbufpv.pv_pa,
  297             msgbufsize, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
  298 
  299         for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
  300                 pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va,
  301                     kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE,
  302                     VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
  303         }
  304 
  305         pmap_devmap_bootstrap(l1pagetable, econa_devmap);
  306         cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
  307         setttb(kernel_l1pt.pv_pa);
  308         cpu_tlb_flushID();
  309         cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
  310         cninit();
  311         mem_info = ((*ddr) >> 4) & 0x3;
  312         memsize = (8<<mem_info)*1024*1024;
  313         physmem = memsize / PAGE_SIZE;
  314 
  315         /*
  316          * Pages were allocated during the secondary bootstrap for the
  317          * stacks for different CPU modes.
  318          * We must now set the r13 registers in the different CPU modes to
  319          * point to these stacks.
  320          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  321          * of the stack memory.
  322          */
  323         cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);
  324 
  325         set_stackptr(PSR_IRQ32_MODE,
  326             irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
  327         set_stackptr(PSR_ABT32_MODE,
  328             abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
  329         set_stackptr(PSR_UND32_MODE,
  330             undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
  331 
  332         /*
  333          * We must now clean the cache again....
  334          * Cleaning may be done by reading new data to displace any
  335          * dirty data in the cache. This will have happened in setttb()
  336          * but since we are boot strapping the addresses used for the read
  337          * may have just been remapped and thus the cache could be out
  338          * of sync. A re-clean after the switch will cure this.
  339          * After booting there are no gross relocations of the kernel thus
  340          * this problem will not occur after initarm().
  341          */
  342         cpu_idcache_wbinv_all();
  343 
  344         /* Set stack for exception handlers */
  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         proc_linkup0(&proc0, &thread0);
  351         thread0.td_kstack = kernelstack.pv_va;
  352         thread0.td_pcb = (struct pcb *)
  353                 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  354         thread0.td_pcb->pcb_flags = 0;
  355         thread0.td_frame = &proc0_tf;
  356         pcpup->pc_curpcb = thread0.td_pcb;
  357 
  358         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  359 
  360         pmap_curmaxkvaddr = afterkern + L1_S_SIZE * (KERNEL_PT_KERN_NUM - 1);
  361 
  362         /*
  363          * ARM_USE_SMALL_ALLOC uses dump_avail, so it must be filled before
  364          * calling pmap_bootstrap.
  365          */
  366         dump_avail[0] = PHYSADDR;
  367         dump_avail[1] = PHYSADDR + memsize;
  368         dump_avail[2] = 0;
  369         dump_avail[3] = 0;
  370 
  371         pmap_bootstrap(freemempos,
  372             KERNVIRTADDR + 3 * memsize,
  373             &kernel_l1pt);
  374 
  375         msgbufp = (void*)msgbufpv.pv_va;
  376         msgbufinit(msgbufp, msgbufsize);
  377 
  378         mutex_init();
  379 
  380         i = 0;
  381 #if PHYSADDR != KERNPHYSADDR
  382         phys_avail[i++] = PHYSADDR;
  383         phys_avail[i++] = KERNPHYSADDR;
  384 #endif
  385         phys_avail[i++] = virtual_avail - KERNVIRTADDR + KERNPHYSADDR;
  386 
  387         phys_avail[i++] = PHYSADDR + memsize;
  388         phys_avail[i++] = 0;
  389         phys_avail[i++] = 0;
  390         init_param2(physmem);
  391         kdb_init();
  392 
  393         return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
  394             sizeof(struct pcb)));
  395 }

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