FreeBSD/Linux Kernel Cross Reference
sys/powerpc/booke/machdep.c

     /*-
      * Copyright (C) 2006-2012 Semihalf
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
     * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
     * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    /*-
     * Copyright (C) 2001 Benno Rice
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $
     */
    /*-
     * Copyright (C) 1995, 1996 Wolfgang Solfrank.
     * Copyright (C) 1995, 1996 TooLs GmbH.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by TooLs GmbH.
     * 4. The name of TooLs GmbH may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.1/sys/powerpc/booke/machdep.c 266003 2014-05-14 04:14:58Z ian $");
    
    #include "opt_compat.h"
    #include "opt_ddb.h"
    #include "opt_kstack_pages.h"
    #include "opt_platform.h"
    
    #include <sys/cdefs.h>
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    #include <sys/time.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/bus.h>
    #include <sys/cons.h>
    #include <sys/cpu.h>
   #include <sys/kdb.h>
   #include <sys/kernel.h>
   #include <sys/lock.h>
   #include <sys/mutex.h>
   #include <sys/rwlock.h>
   #include <sys/sysctl.h>
   #include <sys/exec.h>
   #include <sys/ktr.h>
   #include <sys/syscallsubr.h>
   #include <sys/sysproto.h>
   #include <sys/signalvar.h>
   #include <sys/sysent.h>
   #include <sys/imgact.h>
   #include <sys/msgbuf.h>
   #include <sys/ptrace.h>
   
   #include <vm/vm.h>
   #include <vm/pmap.h>
   #include <vm/vm_page.h>
   #include <vm/vm_object.h>
   #include <vm/vm_pager.h>
   
   #include <machine/cpu.h>
   #include <machine/kdb.h>
   #include <machine/reg.h>
   #include <machine/vmparam.h>
   #include <machine/spr.h>
   #include <machine/hid.h>
   #include <machine/psl.h>
   #include <machine/trap.h>
   #include <machine/md_var.h>
   #include <machine/mmuvar.h>
   #include <machine/sigframe.h>
   #include <machine/machdep.h>
   #include <machine/metadata.h>
   #include <machine/platform.h>
   
   #include <sys/linker.h>
   #include <sys/reboot.h>
   
   #include <contrib/libfdt/libfdt.h>
   #include <dev/fdt/fdt_common.h>
   #include <dev/ofw/openfirm.h>
   
   #ifdef DDB
   extern vm_offset_t ksym_start, ksym_end;
   #endif
   
   #ifdef  DEBUG
   #define debugf(fmt, args...) printf(fmt, ##args)
   #else
   #define debugf(fmt, args...)
   #endif
   
   extern unsigned char kernel_text[];
   extern unsigned char _etext[];
   extern unsigned char _edata[];
   extern unsigned char __bss_start[];
   extern unsigned char __sbss_start[];
   extern unsigned char __sbss_end[];
   extern unsigned char _end[];
   
   /*
    * Bootinfo is passed to us by legacy loaders. Save the address of the
    * structure to handle backward compatibility.
    */
   uint32_t *bootinfo;
   
   struct kva_md_info kmi;
   struct pcpu __pcpu[MAXCPU];
   struct trapframe frame0;
   int cold = 1;
   long realmem = 0;
   long Maxmem = 0;
   char machine[] = "powerpc";
   SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, "");
   
   int cacheline_size = 32;
   
   SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size,
              CTLFLAG_RD, &cacheline_size, 0, "");
   
   int hw_direct_map = 0;
   
   static void cpu_booke_startup(void *);
   SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_booke_startup, NULL);
   
   void print_kernel_section_addr(void);
   void print_kenv(void);
   u_int booke_init(uint32_t, uint32_t);
   
   extern int elf32_nxstack;
   
   static void
   cpu_booke_startup(void *dummy)
   {
           int indx;
           unsigned long size;
   
           /* Initialise the decrementer-based clock. */
           decr_init();
   
           /* Good {morning,afternoon,evening,night}. */
           cpu_setup(PCPU_GET(cpuid));
   
           printf("real memory  = %lu (%ld MB)\n", ptoa(physmem),
               ptoa(physmem) / 1048576);
           realmem = physmem;
   
           /* Display any holes after the first chunk of extended memory. */
           if (bootverbose) {
                   printf("Physical memory chunk(s):\n");
                   for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
                           size = phys_avail[indx + 1] - phys_avail[indx];
   
                           printf("0x%08x - 0x%08x, %lu bytes (%lu pages)\n",
                               phys_avail[indx], phys_avail[indx + 1] - 1,
                               size, size / PAGE_SIZE);
                   }
           }
   
           vm_ksubmap_init(&kmi);
   
           printf("avail memory = %lu (%ld MB)\n", ptoa(cnt.v_free_count),
               ptoa(cnt.v_free_count) / 1048576);
   
           /* Set up buffers, so they can be used to read disk labels. */
           bufinit();
           vm_pager_bufferinit();
   
           /* Cpu supports execution permissions on the pages. */
           elf32_nxstack = 1;
   }
   
   static char *
   kenv_next(char *cp)
   {
   
           if (cp != NULL) {
                   while (*cp != 0)
                           cp++;
                   cp++;
                   if (*cp == 0)
                           cp = NULL;
           }
           return (cp);
   }
   
   void
   print_kenv(void)
   {
           int len;
           char *cp;
   
           debugf("loader passed (static) kenv:\n");
           if (kern_envp == NULL) {
                   debugf(" no env, null ptr\n");
                   return;
           }
           debugf(" kern_envp = 0x%08x\n", (u_int32_t)kern_envp);
   
           len = 0;
           for (cp = kern_envp; cp != NULL; cp = kenv_next(cp))
                   debugf(" %x %s\n", (u_int32_t)cp, cp);
   }
   
   void
   print_kernel_section_addr(void)
   {
   
           debugf("kernel image addresses:\n");
           debugf(" kernel_text    = 0x%08x\n", (uint32_t)kernel_text);
           debugf(" _etext (sdata) = 0x%08x\n", (uint32_t)_etext);
           debugf(" _edata         = 0x%08x\n", (uint32_t)_edata);
           debugf(" __sbss_start   = 0x%08x\n", (uint32_t)__sbss_start);
           debugf(" __sbss_end     = 0x%08x\n", (uint32_t)__sbss_end);
           debugf(" __sbss_start   = 0x%08x\n", (uint32_t)__bss_start);
           debugf(" _end           = 0x%08x\n", (uint32_t)_end);
   }
   
   static int
   booke_check_for_fdt(uint32_t arg1, vm_offset_t *dtbp)
   {
           void *ptr;
   
           if (arg1 % 8 != 0)
                   return (-1);
   
           ptr = (void *)pmap_early_io_map(arg1, PAGE_SIZE);
           if (fdt_check_header(ptr) != 0)
                   return (-1);
   
           *dtbp = (vm_offset_t)ptr;
   
           return (0);
   }
   
   u_int
   booke_init(uint32_t arg1, uint32_t arg2)
   {
           struct pcpu *pc;
           void *kmdp, *mdp;
           vm_offset_t dtbp, end;
   
           kmdp = NULL;
   
           end = (uintptr_t)_end;
           dtbp = (vm_offset_t)NULL;
   
           /* Set up TLB initially */
           bootinfo = NULL;
           tlb1_init();
   
           /*
            * Handle the various ways we can get loaded and started:
            *  -   FreeBSD's loader passes the pointer to the metadata
            *      in arg1, with arg2 undefined. arg1 has a value that's
            *      relative to the kernel's link address (i.e. larger
            *      than 0xc0000000).
            *  -   Juniper's loader passes the metadata pointer in arg2
            *      and sets arg1 to zero. This is to signal that the
            *      loader maps the kernel and starts it at its link
            *      address (unlike the FreeBSD loader).
            *  -   U-Boot passes the standard argc and argv parameters
            *      in arg1 and arg2 (resp). arg1 is between 1 and some
            *      relatively small number, such as 64K. arg2 is the
            *      physical address of the argv vector.
            *  -   ePAPR loaders pass an FDT blob in r3 (arg1) and the magic hex
            *      string 0x45504150 ('ePAP') in r6 (which has been lost by now).
            *      r4 (arg2) is supposed to be set to zero, but is not always.
            */
           
           if (arg1 == 0)                          /* Juniper loader */
                   mdp = (void *)arg2;
           else if (booke_check_for_fdt(arg1, &dtbp) == 0) { /* ePAPR */
                   end = roundup(end, 8);
                   memmove((void *)end, (void *)dtbp, fdt_totalsize((void *)dtbp));
                   dtbp = end;
                   end += fdt_totalsize((void *)dtbp);
                   mdp = NULL;
           } else if (arg1 > (uintptr_t)kernel_text)       /* FreeBSD loader */
                   mdp = (void *)arg1;
           else                                    /* U-Boot */
                   mdp = NULL;
   
           /*
            * Parse metadata and fetch parameters.
            */
           if (mdp != NULL) {
                   preload_metadata = mdp;
                   kmdp = preload_search_by_type("elf kernel");
                   if (kmdp != NULL) {
                           boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
                           kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
                           dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
                           end = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
   
                           bootinfo = (uint32_t *)preload_search_info(kmdp,
                               MODINFO_METADATA | MODINFOMD_BOOTINFO);
   
   #ifdef DDB
                           ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
                           ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
   #endif
                   }
           } else {
                   bzero(__sbss_start, __sbss_end - __sbss_start);
                   bzero(__bss_start, _end - __bss_start);
           }
   
   #if defined(FDT_DTB_STATIC)
           /*
            * In case the device tree blob was not retrieved (from metadata) try
            * to use the statically embedded one.
            */
           if (dtbp == (vm_offset_t)NULL)
                   dtbp = (vm_offset_t)&fdt_static_dtb;
   #endif
   
           if (OF_install(OFW_FDT, 0) == FALSE)
                   while (1);
   
           if (OF_init((void *)dtbp) != 0)
                   while (1);
   
           OF_interpret("perform-fixup", 0);
           
           /* Reset TLB1 to get rid of temporary mappings */
           tlb1_init();
   
           /* Reset Time Base */
           mttb(0);
   
           /* Init params/tunables that can be overridden by the loader. */
           init_param1();
   
           /* Start initializing proc0 and thread0. */
           proc_linkup0(&proc0, &thread0);
           thread0.td_frame = &frame0;
   
           /* Set up per-cpu data and store the pointer in SPR general 0. */
           pc = &__pcpu[0];
           pcpu_init(pc, 0, sizeof(struct pcpu));
           pc->pc_curthread = &thread0;
   #ifdef __powerpc64__
           __asm __volatile("mr 13,%0" :: "r"(pc->pc_curthread));
   #else
           __asm __volatile("mr 2,%0" :: "r"(pc->pc_curthread));
   #endif
           __asm __volatile("mtsprg 0, %0" :: "r"(pc));
   
           /* Initialize system mutexes. */
           mutex_init();
   
           /* Initialize the console before printing anything. */
           cninit();
   
           /* Print out some debug info... */
           debugf("%s: console initialized\n", __func__);
           debugf(" arg3 mdp = 0x%08x\n", (u_int32_t)mdp);
           debugf(" end = 0x%08x\n", (u_int32_t)end);
           debugf(" boothowto = 0x%08x\n", boothowto);
           debugf(" kernel ccsrbar = 0x%08x\n", CCSRBAR_VA);
           debugf(" MSR = 0x%08x\n", mfmsr());
   #if defined(BOOKE_E500)
           debugf(" HID0 = 0x%08x\n", mfspr(SPR_HID0));
           debugf(" HID1 = 0x%08x\n", mfspr(SPR_HID1));
           debugf(" BUCSR = 0x%08x\n", mfspr(SPR_BUCSR));
   #endif
   
           debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
   
           print_kernel_section_addr();
           print_kenv();
   #if defined(BOOKE_E500)
           //tlb1_print_entries();
           //tlb1_print_tlbentries();
   #endif
   
           kdb_init();
   
   #ifdef KDB
           if (boothowto & RB_KDB)
                   kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
   #endif
   
           /* Initialise platform module */
           platform_probe_and_attach();
   
           /* Initialise virtual memory. */
           pmap_mmu_install(MMU_TYPE_BOOKE, 0);
           pmap_bootstrap((uintptr_t)kernel_text, end);
           pmap_bootstrapped = 1;
           debugf("MSR = 0x%08x\n", mfmsr());
   #if defined(BOOKE_E500)
           //tlb1_print_entries();
           //tlb1_print_tlbentries();
   #endif
   
           /* Initialize params/tunables that are derived from memsize. */
           init_param2(physmem);
   
           /* Finish setting up thread0. */
           thread0.td_pcb = (struct pcb *)
               ((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE -
               sizeof(struct pcb)) & ~15);
           bzero((void *)thread0.td_pcb, sizeof(struct pcb));
           pc->pc_curpcb = thread0.td_pcb;
   
           /* Initialise the message buffer. */
           msgbufinit(msgbufp, msgbufsize);
   
           /* Enable Machine Check interrupt. */
           mtmsr(mfmsr() | PSL_ME);
           isync();
   
           /* Enable L1 caches */
           booke_enable_l1_cache();
   
           debugf("%s: SP = 0x%08x\n", __func__,
               ((uintptr_t)thread0.td_pcb - 16) & ~15);
   
           return (((uintptr_t)thread0.td_pcb - 16) & ~15);
   }
   
   #define RES_GRANULE 32
   extern uint32_t tlb0_miss_locks[];
   
   /* Initialise a struct pcpu. */
   void
   cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
   {
   
           pcpu->pc_tid_next = TID_MIN;
   
   #ifdef SMP
           uint32_t *ptr;
           int words_per_gran = RES_GRANULE / sizeof(uint32_t);
   
           ptr = &tlb0_miss_locks[cpuid * words_per_gran];
           pcpu->pc_booke_tlb_lock = ptr;
           *ptr = TLB_UNLOCKED;
           *(ptr + 1) = 0;         /* recurse counter */
   #endif
   }
   
   /*
    * Flush the D-cache for non-DMA I/O so that the I-cache can
    * be made coherent later.
    */
   void
   cpu_flush_dcache(void *ptr, size_t len)
   {
           register_t addr, off;
   
           /*
            * Align the address to a cacheline and adjust the length
            * accordingly. Then round the length to a multiple of the
            * cacheline for easy looping.
            */
           addr = (uintptr_t)ptr;
           off = addr & (cacheline_size - 1);
           addr -= off;
           len = (len + off + cacheline_size - 1) & ~(cacheline_size - 1);
   
           while (len > 0) {
                   __asm __volatile ("dcbf 0,%0" :: "r"(addr));
                   __asm __volatile ("sync");
                   addr += cacheline_size;
                   len -= cacheline_size;
           }
   }
   
   void
   spinlock_enter(void)
   {
           struct thread *td;
           register_t msr;
   
           td = curthread;
           if (td->td_md.md_spinlock_count == 0) {
                   msr = intr_disable();
                   td->td_md.md_spinlock_count = 1;
                   td->td_md.md_saved_msr = msr;
           } else
                   td->td_md.md_spinlock_count++;
           critical_enter();
   }
   
   void
   spinlock_exit(void)
   {
           struct thread *td;
           register_t msr;
   
           td = curthread;
           critical_exit();
           msr = td->td_md.md_saved_msr;
           td->td_md.md_spinlock_count--;
           if (td->td_md.md_spinlock_count == 0)
                   intr_restore(msr);
   }
   
   /* Shutdown the CPU as much as possible. */
   void
   cpu_halt(void)
   {
   
           mtmsr(mfmsr() & ~(PSL_CE | PSL_EE | PSL_ME | PSL_DE));
           while (1)
                   ;
   }
   
   int
   ptrace_set_pc(struct thread *td, unsigned long addr)
   {
           struct trapframe *tf;
   
           tf = td->td_frame;
           tf->srr0 = (register_t)addr;
   
           return (0);
   }
   
   int
   ptrace_single_step(struct thread *td)
   {
           struct trapframe *tf;
   
           tf = td->td_frame;
           tf->srr1 |= PSL_DE;
           tf->cpu.booke.dbcr0 |= (DBCR0_IDM | DBCR0_IC);
           return (0);
   }
   
   int
   ptrace_clear_single_step(struct thread *td)
   {
           struct trapframe *tf;
   
           tf = td->td_frame;
           tf->srr1 &= ~PSL_DE;
           tf->cpu.booke.dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
           return (0);
   }
   
   void
   kdb_cpu_clear_singlestep(void)
   {
           register_t r;
   
           r = mfspr(SPR_DBCR0);
           mtspr(SPR_DBCR0, r & ~DBCR0_IC);
           kdb_frame->srr1 &= ~PSL_DE;
   }
   
   void
   kdb_cpu_set_singlestep(void)
   {
           register_t r;
   
           r = mfspr(SPR_DBCR0);
           mtspr(SPR_DBCR0, r | DBCR0_IC | DBCR0_IDM);
           kdb_frame->srr1 |= PSL_DE;
   }
   
   void
   bzero(void *buf, size_t len)
   {
           caddr_t p;
   
           p = buf;
   
           while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) {
                   *p++ = 0;
                   len--;
           }
   
           while (len >= sizeof(u_long) * 8) {
                   *(u_long*) p = 0;
                   *((u_long*) p + 1) = 0;
                   *((u_long*) p + 2) = 0;
                   *((u_long*) p + 3) = 0;
                   len -= sizeof(u_long) * 8;
                   *((u_long*) p + 4) = 0;
                   *((u_long*) p + 5) = 0;
                   *((u_long*) p + 6) = 0;
                   *((u_long*) p + 7) = 0;
                   p += sizeof(u_long) * 8;
           }
   
           while (len >= sizeof(u_long)) {
                   *(u_long*) p = 0;
                   len -= sizeof(u_long);
                   p += sizeof(u_long);
           }
   
           while (len) {
                   *p++ = 0;
                   len--;
           }
   }
   

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