FreeBSD/Linux Kernel Cross Reference
sys/powerpc/booke/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("$FreeBSD$");
    
    #include "opt_ddb.h"
    #include "opt_hwpmc_hooks.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_extern.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/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
   #include <ddb/ddb.h>
   #endif
   
   #ifdef  DEBUG
   #define debugf(fmt, args...) printf(fmt, ##args)
   #else
   #define debugf(fmt, args...)
   #endif
   
   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[];
   extern vm_offset_t __endkernel;
   extern vm_paddr_t kernload;
   
   /*
    * Bootinfo is passed to us by legacy loaders. Save the address of the
    * structure to handle backward compatibility.
    */
   uint32_t *bootinfo;
   
   void print_kernel_section_addr(void);
   void print_kenv(void);
   uintptr_t booke_init(u_long, u_long);
   void ivor_setup(void);
   
   extern void *interrupt_vector_base;
   extern void *int_critical_input;
   extern void *int_machine_check;
   extern void *int_data_storage;
   extern void *int_instr_storage;
   extern void *int_external_input;
   extern void *int_alignment;
   extern void *int_fpu;
   extern void *int_program;
   extern void *int_syscall;
   extern void *int_decrementer;
   extern void *int_fixed_interval_timer;
   extern void *int_watchdog;
   extern void *int_data_tlb_error;
   extern void *int_inst_tlb_error;
   extern void *int_debug;
   extern void *int_debug_ed;
   extern void *int_vec;
   extern void *int_vecast;
   #ifdef __SPE__
   extern void *int_spe_fpdata;
   extern void *int_spe_fpround;
   #endif
   #ifdef HWPMC_HOOKS
   extern void *int_performance_counter;
   #endif
   
   #define SET_TRAP(ivor, handler) \
           KASSERT(((uintptr_t)(&handler) & ~0xffffUL) == \
               ((uintptr_t)(&interrupt_vector_base) & ~0xffffUL), \
               ("Handler " #handler " too far from interrupt vector base")); \
           mtspr(ivor, (uintptr_t)(&handler) & 0xffffUL);
   
   uintptr_t powerpc_init(vm_offset_t fdt, vm_offset_t, vm_offset_t, void *mdp,
       uint32_t mdp_cookie);
   void booke_cpu_init(void);
   
   void
   booke_cpu_init(void)
   {
   
           cpu_features |= PPC_FEATURE_BOOKE;
   
           psl_kernset = PSL_CE | PSL_ME | PSL_EE;
   #ifdef __powerpc64__
           psl_kernset |= PSL_CM;
   #endif
           psl_userset = psl_kernset | PSL_PR;
   #ifdef __powerpc64__
           psl_userset32 = psl_userset & ~PSL_CM;
   #endif
           /*
            * Zeroed bits in this variable signify that the value of the bit
            * in its position is allowed to vary between userspace contexts.
            *
            * All other bits are required to be identical for every userspace
            * context. The actual *value* of the bit is determined by
            * psl_userset and/or psl_userset32, and is not allowed to change.
            *
            * Remember to update this set when implementing support for
            * *conditionally* enabling a processor facility. Failing to do
            * this will cause swapcontext() in userspace to break when a
            * process uses a conditionally-enabled facility.
            *
            * When *unconditionally* implementing support for a processor
            * facility, update psl_userset / psl_userset32 instead.
            *
            * See the access control check in set_mcontext().
            */
           psl_userstatic = ~(PSL_VEC | PSL_FP | PSL_FE0 | PSL_FE1);
   
           pmap_mmu_install(MMU_TYPE_BOOKE, BUS_PROBE_GENERIC);
   }
   
   void
   ivor_setup(void)
   {
   
           mtspr(SPR_IVPR, ((uintptr_t)&interrupt_vector_base) & ~0xffffUL);
   
           SET_TRAP(SPR_IVOR0, int_critical_input);
           SET_TRAP(SPR_IVOR1, int_machine_check);
           SET_TRAP(SPR_IVOR2, int_data_storage);
           SET_TRAP(SPR_IVOR3, int_instr_storage);
           SET_TRAP(SPR_IVOR4, int_external_input);
           SET_TRAP(SPR_IVOR5, int_alignment);
           SET_TRAP(SPR_IVOR6, int_program);
           SET_TRAP(SPR_IVOR8, int_syscall);
           SET_TRAP(SPR_IVOR10, int_decrementer);
           SET_TRAP(SPR_IVOR11, int_fixed_interval_timer);
           SET_TRAP(SPR_IVOR12, int_watchdog);
           SET_TRAP(SPR_IVOR13, int_data_tlb_error);
           SET_TRAP(SPR_IVOR14, int_inst_tlb_error);
           SET_TRAP(SPR_IVOR15, int_debug);
   #ifdef HWPMC_HOOKS
           SET_TRAP(SPR_IVOR35, int_performance_counter);
   #endif
           switch ((mfpvr() >> 16) & 0xffff) {
           case FSL_E6500:
                   SET_TRAP(SPR_IVOR32, int_vec);
                   SET_TRAP(SPR_IVOR33, int_vecast);
                   /* FALLTHROUGH */
           case FSL_E500mc:
           case FSL_E5500:
                   SET_TRAP(SPR_IVOR7, int_fpu);
                   SET_TRAP(SPR_IVOR15, int_debug_ed);
                   break;
           case FSL_E500v1:
           case FSL_E500v2:
                   SET_TRAP(SPR_IVOR32, int_vec);
   #ifdef __SPE__
                   SET_TRAP(SPR_IVOR33, int_spe_fpdata);
                   SET_TRAP(SPR_IVOR34, int_spe_fpround);
   #endif
                   break;
           }
   
   #ifdef __powerpc64__
           /* Set 64-bit interrupt mode. */
           mtspr(SPR_EPCR, mfspr(SPR_EPCR) | EPCR_ICM);
   #endif
   }
   
   static int
   booke_check_for_fdt(uint32_t arg1, vm_offset_t *dtbp)
   {
           void *ptr;
           int fdt_size;
   
           if (arg1 % 8 != 0)
                   return (-1);
   
           ptr = (void *)pmap_early_io_map(arg1, PAGE_SIZE);
           if (fdt_check_header(ptr) != 0)
                   return (-1);
   
           /*
            * Read FDT total size from the header of FDT.
            * This for sure hits within first page which is
            * already mapped.
            */
           fdt_size = fdt_totalsize((void *)ptr);
   
           /* 
            * Ok, arg1 points to FDT, so we need to map it in.
            * First, unmap this page and then map FDT again with full size
            */
           pmap_early_io_unmap((vm_offset_t)ptr, PAGE_SIZE);
           ptr = (void *)pmap_early_io_map(arg1, fdt_size); 
           *dtbp = (vm_offset_t)ptr;
   
           return (0);
   }
   
   uintptr_t
   booke_init(u_long arg1, u_long arg2)
   {
           uintptr_t ret;
           void *mdp;
           vm_offset_t dtbp, end;
   
           end = (uintptr_t)_end;
           dtbp = (vm_offset_t)NULL;
   
           /* Set up TLB initially */
           bootinfo = NULL;
           bzero(__sbss_start, __sbss_end - __sbss_start);
           bzero(__bss_start, _end - __bss_start);
           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);
                   __endkernel = end;
                   mdp = NULL;
           } else if (arg1 > (uintptr_t)kernload)  /* FreeBSD loader */
                   mdp = (void *)arg1;
           else                                    /* U-Boot */
                   mdp = NULL;
   
           /* Default to 32 byte cache line size. */
           switch ((mfpvr()) >> 16) {
           case FSL_E500mc:
           case FSL_E5500:
           case FSL_E6500:
                   cacheline_size = 64;
                   break;
           }
   
           /*
            * Last element is a magic cookie that indicates that the metadata
            * pointer is meaningful.
            */
           ret = powerpc_init(dtbp, 0, 0, mdp, (mdp == NULL) ? 0 : 0xfb5d104d);
   
           /* Enable caches */
           booke_enable_l1_cache();
           booke_enable_l2_cache();
   
           booke_enable_bpred();
   
           return (ret);
   }
   
   #define RES_GRANULE cacheline_size
   extern uintptr_t tlb0_miss_locks[];
   
   /* Initialise a struct pcpu. */
   void
   cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
   {
   
           pcpu->pc_booke.tid_next = TID_MIN;
   
   #ifdef SMP
           uintptr_t *ptr;
           int words_per_gran = RES_GRANULE / sizeof(uintptr_t);
   
           ptr = &tlb0_miss_locks[cpuid * words_per_gran];
           pcpu->pc_booke.tlb_lock = ptr;
           *ptr = TLB_UNLOCKED;
           *(ptr + 1) = 0;         /* recurse counter */
   #endif
   }
   
   /* 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_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;
   }

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