1109 lines
31 KiB
ArmAsm
1109 lines
31 KiB
ArmAsm
/* $NetBSD: locore.s,v 1.20 1997/05/13 17:25:54 gwr Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1980, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: locore.s 1.66 92/12/22$
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* @(#)locore.s 8.6 (Berkeley) 5/27/94
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*/
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#include "assym.h"
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#include <machine/asm.h>
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#include <machine/trap.h>
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| Remember this is a fun project!
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.data
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GLOBAL(mon_crp)
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.long 0,0
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| This is for kvm_mkdb, and should be the address of the beginning
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| of the kernel text segment (not necessarily the same as kernbase).
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.text
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GLOBAL(kernel_text)
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| This is the entry point, as well as the end of the temporary stack
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| used during process switch (one 8K page ending at start)
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ASGLOBAL(tmpstk)
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ASGLOBAL(start)
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| The first step, after disabling interrupts, is to map enough of the kernel
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| into high virtual address space so that we can use position dependent code.
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| This is a tricky task on the sun3x because the MMU is already enabled and
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| the ROM monitor provides no indication of where the root MMU table is mapped.
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| Therefore we must use one of the 68030's 'transparent translation' registers
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| to define a range in the address space where the MMU translation is
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| turned off. Once this is complete we can modify the MMU table directly
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| without the need for it to be mapped into virtual memory.
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| All code must be position independent until otherwise noted, as the
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| boot loader has loaded us into low memory but all the symbols in this
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| code have been linked high.
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movw #PSL_HIGHIPL, sr | no interrupts
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movl #KERNBASE, a5 | for vtop conversion
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lea _C_LABEL(mon_crp), a0 | where to store the CRP
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subl a5, a0
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| Note: borrowing mon_crp for tt0 setup...
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movl #0x3F8107, a0@ | map the low 1GB v=p with the
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.long 0xf0100800 | transparent translation reg0
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| [ pmove a0@, tt0 ]
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| In order to map the kernel into high memory we will copy the root table
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| entry which maps the 16 megabytes of memory starting at 0x0 into the
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| entry which maps the 16 megabytes starting at KERNBASE.
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pmove crp, a0@ | Get monitor CPU root pointer
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movl a0@(4), a1 | 2nd word is PA of level A table
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movl a1, a0 | compute the descriptor address
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addl #0x3e0, a1 | for VA starting at KERNBASE
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movl a0@, a1@ | copy descriptor type
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movl a0@(4), a1@(4) | copy physical address
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| Kernel is now double mapped at zero and KERNBASE.
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| Force a long jump to the relocated code (high VA).
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movl #IC_CLEAR, d0 | Flush the I-cache
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movc d0, cacr
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jmp L_high_code:l | long jump
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L_high_code:
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| We are now running in the correctly relocated kernel, so
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| we are no longer restricted to position-independent code.
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| It is handy to leave transparent translation enabled while
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| for the low 1GB while _bootstrap() is doing its thing.
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| Do bootstrap stuff needed before main() gets called.
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| Our boot loader leaves a copy of the kernel's exec header
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| just before the start of the kernel text segment, so the
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| kernel can sanity-check the DDB symbols at [end...esym].
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| Pass the struct exec at tmpstk-32 to _bootstrap().
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| Also, make sure the initial frame pointer is zero so that
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| the backtrace algorithm used by KGDB terminates nicely.
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lea _ASM_LABEL(tmpstk)-32, sp
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movl #0,a6
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jsr _C_LABEL(_bootstrap) | See _startup.c
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| Now turn off the transparent translation of the low 1GB.
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| (this also flushes the ATC)
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clrl sp@-
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.long 0xf0170800 | pmove sp@,tt0
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addql #4,sp
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| Now that _bootstrap() is done using the PROM functions,
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| we can safely set the sfc/dfc to something != FC_CONTROL
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moveq #FC_USERD, d0 | make movs access "user data"
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movc d0, sfc | space for copyin/copyout
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movc d0, dfc
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| Setup process zero user/kernel stacks.
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movl _C_LABEL(proc0paddr),a1 | get proc0 pcb addr
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lea a1@(USPACE-4),sp | set SSP to last word
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movl #USRSTACK-4,a2
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movl a2,usp | init user SP
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| Note curpcb was already set in _bootstrap().
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| Will do fpu initialization during autoconfig (see fpu.c)
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| The interrupt vector table and stack are now ready.
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| Interrupts will be enabled later, AFTER autoconfiguration
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| is finished, to avoid spurrious interrupts.
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/*
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* Final preparation for calling main.
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*
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* Create a fake exception frame that returns to user mode,
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* and save its address in p->p_md.md_regs for cpu_fork().
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* The new frames for process 1 and 2 will be adjusted by
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* cpu_set_kpc() to arrange for a call to a kernel function
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* before the new process does its rte out to user mode.
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*/
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clrw sp@- | tf_format,tf_vector
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clrl sp@- | tf_pc (filled in later)
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movw #PSL_USER,sp@- | tf_sr for user mode
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clrl sp@- | tf_stackadj
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lea sp@(-64),sp | tf_regs[16]
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movl sp,a1 | a1=trapframe
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lea _C_LABEL(proc0),a0 | proc0.p_md.md_regs =
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movl a1,a0@(P_MDREGS) | trapframe
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movl a2,a1@(FR_SP) | a2 == usp (from above)
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pea a1@ | push &trapframe
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jbsr _C_LABEL(main) | main(&trapframe)
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addql #4,sp | help DDB backtrace
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trap #15 | should not get here
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| This is used by cpu_fork() to return to user mode.
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| It is called with SP pointing to a struct trapframe.
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GLOBAL(proc_do_uret)
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movl sp@(FR_SP),a0 | grab and load
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movl a0,usp | user SP
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moveml sp@+,#0x7FFF | load most registers (all but SSP)
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addql #8,sp | pop SSP and stack adjust count
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rte
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/*
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* proc_trampoline:
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* This is used by cpu_set_kpc() to "push" a function call onto the
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* kernel stack of some process, very much like a signal delivery.
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* When we get here, the stack has:
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*
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* SP+8: switchframe from before cpu_set_kpc
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* SP+4: void *proc;
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* SP: u_long func;
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*
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* On entry, the switchframe pushed by cpu_set_kpc has already been
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* popped off the stack, so all this needs to do is pop the function
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* pointer into a register, call it, then pop the arg, and finally
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* return using the switchframe that remains on the stack.
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*/
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GLOBAL(proc_trampoline)
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movl sp@+,a0 | function pointer
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jbsr a0@ | (*func)(procp)
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addql #4,sp | toss the arg
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rts | as cpu_switch would do
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| That is all the assembly startup code we need on the sun3x!
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| The rest of this is like the hp300/locore.s where possible.
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/*
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* Trap/interrupt vector routines
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*/
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#include <m68k/m68k/trap_subr.s>
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GLOBAL(buserr)
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tstl _C_LABEL(nofault) | device probe?
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jeq _C_LABEL(addrerr) | no, handle as usual
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movl _C_LABEL(nofault),sp@- | yes,
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jbsr _C_LABEL(longjmp) | longjmp(nofault)
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GLOBAL(addrerr)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save user registers
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movl usp,a0 | save the user SP
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movl a0,sp@(FR_SP) | in the savearea
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lea sp@(FR_HW),a1 | grab base of HW berr frame
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moveq #0,d0
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movw a1@(10),d0 | grab SSW for fault processing
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btst #12,d0 | RB set?
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jeq LbeX0 | no, test RC
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bset #14,d0 | yes, must set FB
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movw d0,a1@(10) | for hardware too
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LbeX0:
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btst #13,d0 | RC set?
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jeq LbeX1 | no, skip
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bset #15,d0 | yes, must set FC
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movw d0,a1@(10) | for hardware too
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LbeX1:
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btst #8,d0 | data fault?
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jeq Lbe0 | no, check for hard cases
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movl a1@(16),d1 | fault address is as given in frame
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jra Lbe10 | thats it
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Lbe0:
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btst #4,a1@(6) | long (type B) stack frame?
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jne Lbe4 | yes, go handle
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movl a1@(2),d1 | no, can use save PC
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btst #14,d0 | FB set?
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jeq Lbe3 | no, try FC
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addql #4,d1 | yes, adjust address
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jra Lbe10 | done
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Lbe3:
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btst #15,d0 | FC set?
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jeq Lbe10 | no, done
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addql #2,d1 | yes, adjust address
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jra Lbe10 | done
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Lbe4:
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movl a1@(36),d1 | long format, use stage B address
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btst #15,d0 | FC set?
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jeq Lbe10 | no, all done
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subql #2,d1 | yes, adjust address
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Lbe10:
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movl d1,sp@- | push fault VA
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movl d0,sp@- | and padded SSW
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movw a1@(6),d0 | get frame format/vector offset
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andw #0x0FFF,d0 | clear out frame format
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cmpw #12,d0 | address error vector?
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jeq Lisaerr | yes, go to it
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/* MMU-specific code to determine reason for bus error. */
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movl d1,a0 | fault address
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movl sp@,d0 | function code from ssw
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btst #8,d0 | data fault?
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jne Lbe10a
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movql #1,d0 | user program access FC
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| (we dont separate data/program)
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btst #5,a1@ | supervisor mode?
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jeq Lbe10a | if no, done
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movql #5,d0 | else supervisor program access
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Lbe10a:
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ptestr d0,a0@,#7 | do a table search
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pmove psr,sp@ | save result
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movb sp@,d1
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btst #2,d1 | invalid? (incl. limit viol and berr)
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jeq Lmightnotbemerr | no -> wp check
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btst #7,d1 | is it MMU table berr?
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jeq Lismerr | no, must be fast
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jra Lisberr1 | real bus err needs not be fast
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Lmightnotbemerr:
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btst #3,d1 | write protect bit set?
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jeq Lisberr1 | no, must be bus error
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movl sp@,d0 | ssw into low word of d0
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andw #0xc0,d0 | write protect is set on page:
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cmpw #0x40,d0 | was it read cycle?
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jeq Lisberr1 | yes, was not WPE, must be bus err
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/* End of MMU-specific bus error code. */
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Lismerr:
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movl #T_MMUFLT,sp@- | show that we are an MMU fault
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jra _ASM_LABEL(faultstkadj) | and deal with it
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Lisaerr:
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movl #T_ADDRERR,sp@- | mark address error
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jra _ASM_LABEL(faultstkadj) | and deal with it
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Lisberr1:
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clrw sp@ | re-clear pad word
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Lisberr:
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movl #T_BUSERR,sp@- | mark bus error
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jra _ASM_LABEL(faultstkadj) | and deal with it
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/*
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* FP exceptions.
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*/
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GLOBAL(fpfline)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save registers
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moveq #T_FPEMULI,d0 | denote as FP emulation trap
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jra _ASM_LABEL(fault) | do it
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GLOBAL(fpunsupp)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save registers
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moveq #T_FPEMULD,d0 | denote as FP emulation trap
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jra _ASM_LABEL(fault) | do it
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/*
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* Handles all other FP coprocessor exceptions.
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* Note that since some FP exceptions generate mid-instruction frames
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* and may cause signal delivery, we need to test for stack adjustment
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* after the trap call.
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*/
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GLOBAL(fpfault)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save user registers
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movl usp,a0 | and save
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movl a0,sp@(FR_SP) | the user stack pointer
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clrl sp@- | no VA arg
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movl _C_LABEL(curpcb),a0 | current pcb
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lea a0@(PCB_FPCTX),a0 | address of FP savearea
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fsave a0@ | save state
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tstb a0@ | null state frame?
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jeq Lfptnull | yes, safe
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clrw d0 | no, need to tweak BIU
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movb a0@(1),d0 | get frame size
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bset #3,a0@(0,d0:w) | set exc_pend bit of BIU
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Lfptnull:
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fmovem fpsr,sp@- | push fpsr as code argument
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frestore a0@ | restore state
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movl #T_FPERR,sp@- | push type arg
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jra _ASM_LABEL(faultstkadj) | call trap and deal with stack cleanup
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/*
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* Other exceptions only cause four and six word stack frame and require
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* no post-trap stack adjustment.
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*/
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GLOBAL(badtrap)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save std frame regs
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jbsr _C_LABEL(straytrap) | report
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moveml sp@+,#0xFFFF | restore regs
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addql #4, sp | stack adjust count
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jra _ASM_LABEL(rei) | all done
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/*
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* Trap 0 is for system calls
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*/
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GLOBAL(trap0)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@- | save user registers
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movl usp,a0 | save the user SP
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movl a0,sp@(FR_SP) | in the savearea
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movl d0,sp@- | push syscall number
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jbsr _C_LABEL(syscall) | handle it
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addql #4,sp | pop syscall arg
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movl sp@(FR_SP),a0 | grab and restore
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movl a0,usp | user SP
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moveml sp@+,#0x7FFF | restore most registers
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addql #8,sp | pop SP and stack adjust
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jra _ASM_LABEL(rei) | all done
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/*
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* Trap 1 action depends on the emulation type:
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* NetBSD: sigreturn "syscall"
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* HPUX: user breakpoint
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*/
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GLOBAL(trap1)
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#if 0 /* COMPAT_HPUX */
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/* If process is HPUX, this is a user breakpoint. */
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jne _C_LABEL(trap15) | HPUX user breakpoint
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#endif
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jra _ASM_LABEL(sigreturn) | NetBSD
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/*
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* Trap 2 action depends on the emulation type:
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* NetBSD: user breakpoint -- See XXX below...
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* SunOS: cache flush
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* HPUX: sigreturn
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*/
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GLOBAL(trap2)
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#if 0 /* COMPAT_HPUX */
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/* If process is HPUX, this is a sigreturn call */
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jne _ASM_LABEL(sigreturn)
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#endif
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jra _C_LABEL(trap15) | NetBSD user breakpoint
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| XXX - Make NetBSD use trap 15 for breakpoints?
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| XXX - That way, we can allow this cache flush...
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| XXX SunOS trap #2 (and NetBSD?)
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| Flush on-chip cache (leave it enabled)
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| movl #CACHE_CLR,d0
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| movc d0,cacr
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| rte
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/*
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* Trap 12 is the entry point for the cachectl "syscall"
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* cachectl(command, addr, length)
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* command in d0, addr in a1, length in d1
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*/
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GLOBAL(trap12)
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movl d1,sp@- | push length
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movl a1,sp@- | push addr
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movl d0,sp@- | push command
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jbsr _C_LABEL(cachectl) | do it
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lea sp@(12),sp | pop args
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jra _ASM_LABEL(rei) | all done
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/*
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* Trace (single-step) trap. Kernel-mode is special.
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* User mode traps are simply passed on to trap().
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*/
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GLOBAL(trace)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@-
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moveq #T_TRACE,d0
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btst #5,sp@(FR_HW) | was supervisor mode?
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jne _ASM_LABEL(kbrkpt) | yes, kernel brkpt
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jra _ASM_LABEL(fault) | no, user-mode fault
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/*
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* Trap 15 is used for:
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* - GDB breakpoints (in user programs)
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* - KGDB breakpoints (in the kernel)
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* - trace traps for SUN binaries (not fully supported yet)
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* User mode traps are simply passed to trap().
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*/
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GLOBAL(trap15)
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clrl sp@- | stack adjust count
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moveml #0xFFFF,sp@-
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moveq #T_TRAP15,d0
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btst #5,sp@(FR_HW) | was supervisor mode?
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jne _ASM_LABEL(kbrkpt) | yes, kernel brkpt
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jra _ASM_LABEL(fault) | no, user-mode fault
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ASLOCAL(kbrkpt)
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| Kernel-mode breakpoint or trace trap. (d0=trap_type)
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| Save the system sp rather than the user sp.
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movw #PSL_HIGHIPL,sr | lock out interrupts
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lea sp@(FR_SIZE),a6 | Save stack pointer
|
|
movl a6,sp@(FR_SP) | from before trap
|
|
|
|
| If we are not on tmpstk switch to it.
|
|
| (so debugger can change the stack pointer)
|
|
movl a6,d1
|
|
cmpl #_ASM_LABEL(tmpstk),d1
|
|
jls Lbrkpt2 | already on tmpstk
|
|
| Copy frame to the temporary stack
|
|
movl sp,a0 | a0=src
|
|
lea _ASM_LABEL(tmpstk)-96,a1 | a1=dst
|
|
movl a1,sp | sp=new frame
|
|
moveq #FR_SIZE,d1
|
|
Lbrkpt1:
|
|
movl a0@+,a1@+
|
|
subql #4,d1
|
|
bgt Lbrkpt1
|
|
|
|
Lbrkpt2:
|
|
| Call the trap handler for the kernel debugger.
|
|
| Do not call trap() to handle it, so that we can
|
|
| set breakpoints in trap() if we want. We know
|
|
| the trap type is either T_TRACE or T_BREAKPOINT.
|
|
movl d0,sp@- | push trap type
|
|
jbsr _C_LABEL(trap_kdebug)
|
|
addql #4,sp | pop args
|
|
|
|
| The stack pointer may have been modified, or
|
|
| data below it modified (by kgdb push call),
|
|
| so push the hardware frame at the current sp
|
|
| before restoring registers and returning.
|
|
movl sp@(FR_SP),a0 | modified sp
|
|
lea sp@(FR_SIZE),a1 | end of our frame
|
|
movl a1@-,a0@- | copy 2 longs with
|
|
movl a1@-,a0@- | ... predecrement
|
|
movl a0,sp@(FR_SP) | sp = h/w frame
|
|
moveml sp@+,#0x7FFF | restore all but sp
|
|
movl sp@,sp | ... and sp
|
|
rte | all done
|
|
|
|
/* Use common m68k sigreturn */
|
|
#include <m68k/m68k/sigreturn.s>
|
|
|
|
/*
|
|
* Interrupt handlers. Most are auto-vectored,
|
|
* and hard-wired the same way on all sun3 models.
|
|
* Format in the stack is:
|
|
* d0,d1,a0,a1, sr, pc, vo
|
|
*/
|
|
|
|
#define INTERRUPT_SAVEREG \
|
|
moveml #0xC0C0,sp@-
|
|
|
|
#define INTERRUPT_RESTORE \
|
|
moveml sp@+,#0x0303
|
|
|
|
/*
|
|
* This is the common auto-vector interrupt handler,
|
|
* for which the CPU provides the vector=0x18+level.
|
|
* These are installed in the interrupt vector table.
|
|
*/
|
|
.align 2
|
|
GLOBAL(_isr_autovec)
|
|
INTERRUPT_SAVEREG
|
|
jbsr _C_LABEL(isr_autovec)
|
|
INTERRUPT_RESTORE
|
|
jra _ASM_LABEL(rei)
|
|
|
|
/* clock: see clock.c */
|
|
.align 2
|
|
GLOBAL(_isr_clock)
|
|
INTERRUPT_SAVEREG
|
|
jbsr _C_LABEL(clock_intr)
|
|
INTERRUPT_RESTORE
|
|
jra _ASM_LABEL(rei)
|
|
|
|
| Handler for all vectored interrupts (i.e. VME interrupts)
|
|
.align 2
|
|
GLOBAL(_isr_vectored)
|
|
INTERRUPT_SAVEREG
|
|
jbsr _C_LABEL(isr_vectored)
|
|
INTERRUPT_RESTORE
|
|
jra _ASM_LABEL(rei)
|
|
|
|
#undef INTERRUPT_SAVEREG
|
|
#undef INTERRUPT_RESTORE
|
|
|
|
/* interrupt counters (needed by vmstat) */
|
|
GLOBAL(intrnames)
|
|
.asciz "spur" | 0
|
|
.asciz "lev1" | 1
|
|
.asciz "lev2" | 2
|
|
.asciz "lev3" | 3
|
|
.asciz "lev4" | 4
|
|
.asciz "clock" | 5
|
|
.asciz "lev6" | 6
|
|
.asciz "nmi" | 7
|
|
GLOBAL(eintrnames)
|
|
|
|
.data
|
|
.even
|
|
GLOBAL(intrcnt)
|
|
.long 0,0,0,0,0,0,0,0,0,0
|
|
GLOBAL(eintrcnt)
|
|
.text
|
|
|
|
/*
|
|
* Emulation of VAX REI instruction.
|
|
*
|
|
* This code is (mostly) un-altered from the hp300 code,
|
|
* except that sun machines do not need a simulated SIR
|
|
* because they have a real software interrupt register.
|
|
*
|
|
* This code deals with checking for and servicing ASTs
|
|
* (profiling, scheduling) and software interrupts (network, softclock).
|
|
* We check for ASTs first, just like the VAX. To avoid excess overhead
|
|
* the T_ASTFLT handling code will also check for software interrupts so we
|
|
* do not have to do it here. After identifying that we need an AST we
|
|
* drop the IPL to allow device interrupts.
|
|
*
|
|
* This code is complicated by the fact that sendsig may have been called
|
|
* necessitating a stack cleanup.
|
|
*/
|
|
|
|
ASGLOBAL(rei)
|
|
#ifdef DIAGNOSTIC
|
|
tstl _C_LABEL(panicstr) | have we paniced?
|
|
jne Ldorte | yes, do not make matters worse
|
|
#endif
|
|
tstl _C_LABEL(astpending) | AST pending?
|
|
jeq Ldorte | no, done
|
|
Lrei1:
|
|
btst #5,sp@ | yes, are we returning to user mode?
|
|
jne Ldorte | no, done
|
|
movw #PSL_LOWIPL,sr | lower SPL
|
|
clrl sp@- | stack adjust
|
|
moveml #0xFFFF,sp@- | save all registers
|
|
movl usp,a1 | including
|
|
movl a1,sp@(FR_SP) | the users SP
|
|
clrl sp@- | VA == none
|
|
clrl sp@- | code == none
|
|
movl #T_ASTFLT,sp@- | type == async system trap
|
|
jbsr _C_LABEL(trap) | go handle it
|
|
lea sp@(12),sp | pop value args
|
|
movl sp@(FR_SP),a0 | restore user SP
|
|
movl a0,usp | from save area
|
|
movw sp@(FR_ADJ),d0 | need to adjust stack?
|
|
jne Laststkadj | yes, go to it
|
|
moveml sp@+,#0x7FFF | no, restore most user regs
|
|
addql #8,sp | toss SP and stack adjust
|
|
rte | and do real RTE
|
|
Laststkadj:
|
|
lea sp@(FR_HW),a1 | pointer to HW frame
|
|
addql #8,a1 | source pointer
|
|
movl a1,a0 | source
|
|
addw d0,a0 | + hole size = dest pointer
|
|
movl a1@-,a0@- | copy
|
|
movl a1@-,a0@- | 8 bytes
|
|
movl a0,sp@(FR_SP) | new SSP
|
|
moveml sp@+,#0x7FFF | restore user registers
|
|
movl sp@,sp | and our SP
|
|
Ldorte:
|
|
rte | real return
|
|
|
|
/*
|
|
* Initialization is at the beginning of this file, because the
|
|
* kernel entry point needs to be at zero for compatibility with
|
|
* the Sun boot loader. This works on Sun machines because the
|
|
* interrupt vector table for reset is NOT at address zero.
|
|
* (The MMU has a "boot" bit that forces access to the PROM)
|
|
*/
|
|
|
|
/*
|
|
* Use common m68k sigcode.
|
|
*/
|
|
#include <m68k/m68k/sigcode.s>
|
|
|
|
.text
|
|
|
|
/*
|
|
* Primitives
|
|
*/
|
|
|
|
/*
|
|
* Use common m68k support routines.
|
|
*/
|
|
#include <m68k/m68k/support.s>
|
|
|
|
BSS(want_resched,4)
|
|
|
|
/*
|
|
* Use common m68k process manipulation routines.
|
|
*/
|
|
#include <m68k/m68k/proc_subr.s>
|
|
|
|
| Message for Lbadsw panic
|
|
Lsw0:
|
|
.asciz "cpu_switch"
|
|
.even
|
|
|
|
.data
|
|
GLOBAL(masterpaddr) | XXX compatibility (debuggers)
|
|
GLOBAL(curpcb)
|
|
.long 0
|
|
ASBSS(nullpcb,SIZEOF_PCB)
|
|
.text
|
|
|
|
/*
|
|
* At exit of a process, do a cpu_switch for the last time.
|
|
* Switch to a safe stack and PCB, and deallocate the process's resources.
|
|
* The ipl is high enough to prevent the memory from being reallocated.
|
|
*/
|
|
ENTRY(switch_exit)
|
|
movl sp@(4),a0 | struct proc *p
|
|
| save state into garbage pcb
|
|
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
|
|
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
|
|
movl a0,sp@- | pass proc ptr down
|
|
|
|
/* Free old process's u-area. */
|
|
movl #USPACE,sp@- | size of u-area
|
|
movl a0@(P_ADDR),sp@- | address of process's u-area
|
|
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
|
|
jbsr _C_LABEL(kmem_free) | deallocate it
|
|
lea sp@(12),sp | pop args
|
|
|
|
jra _C_LABEL(cpu_switch)
|
|
|
|
/*
|
|
* When no processes are on the runq, cpu_switch() branches to idle
|
|
* to wait for something to come ready.
|
|
*/
|
|
.data
|
|
GLOBAL(Idle_count)
|
|
.long 0
|
|
.text
|
|
|
|
Lidle:
|
|
stop #PSL_LOWIPL
|
|
GLOBAL(_Idle) | See clock.c
|
|
movw #PSL_HIGHIPL,sr
|
|
addql #1, _C_LABEL(Idle_count)
|
|
tstl _C_LABEL(whichqs)
|
|
jeq Lidle
|
|
movw #PSL_LOWIPL,sr
|
|
jra Lsw1
|
|
|
|
Lbadsw:
|
|
movl #Lsw0,sp@-
|
|
jbsr _C_LABEL(panic)
|
|
/*NOTREACHED*/
|
|
|
|
/*
|
|
* cpu_switch()
|
|
* Hacked for sun3
|
|
* XXX - Arg 1 is a proc pointer (curproc) but this doesn't use it.
|
|
* XXX - Sould we use p->p_addr instead of curpcb? -gwr
|
|
*/
|
|
ENTRY(cpu_switch)
|
|
movl _C_LABEL(curpcb),a1 | current pcb
|
|
movw sr,a1@(PCB_PS) | save sr before changing ipl
|
|
#ifdef notyet
|
|
movl _C_LABEL(curproc),sp@- | remember last proc running
|
|
#endif
|
|
clrl _C_LABEL(curproc)
|
|
|
|
Lsw1:
|
|
/*
|
|
* Find the highest-priority queue that isn't empty,
|
|
* then take the first proc from that queue.
|
|
*/
|
|
clrl d0
|
|
lea _C_LABEL(whichqs),a0
|
|
movl a0@,d1
|
|
Lswchk:
|
|
btst d0,d1
|
|
jne Lswfnd
|
|
addqb #1,d0
|
|
cmpb #32,d0
|
|
jne Lswchk
|
|
jra _C_LABEL(_Idle)
|
|
Lswfnd:
|
|
movw #PSL_HIGHIPL,sr | lock out interrupts
|
|
movl a0@,d1 | and check again...
|
|
bclr d0,d1
|
|
jeq Lsw1 | proc moved, rescan
|
|
movl d1,a0@ | update whichqs
|
|
moveq #1,d1 | double check for higher priority
|
|
lsll d0,d1 | process (which may have snuck in
|
|
subql #1,d1 | while we were finding this one)
|
|
andl a0@,d1
|
|
jeq Lswok | no one got in, continue
|
|
movl a0@,d1
|
|
bset d0,d1 | otherwise put this one back
|
|
movl d1,a0@
|
|
jra Lsw1 | and rescan
|
|
Lswok:
|
|
movl d0,d1
|
|
lslb #3,d1 | convert queue number to index
|
|
addl #_qs,d1 | locate queue (q)
|
|
movl d1,a1
|
|
cmpl a1@(P_FORW),a1 | anyone on queue?
|
|
jeq Lbadsw | no, panic
|
|
movl a1@(P_FORW),a0 | p = q->p_forw
|
|
movl a0@(P_FORW),a1@(P_FORW) | q->p_forw = p->p_forw
|
|
movl a0@(P_FORW),a1 | q = p->p_forw
|
|
movl a0@(P_BACK),a1@(P_BACK) | q->p_back = p->p_back
|
|
cmpl a0@(P_FORW),d1 | anyone left on queue?
|
|
jeq Lsw2 | no, skip
|
|
movl _C_LABEL(whichqs),d1
|
|
bset d0,d1 | yes, reset bit
|
|
movl d1,_C_LABEL(whichqs)
|
|
Lsw2:
|
|
movl a0,_C_LABEL(curproc)
|
|
clrl _C_LABEL(want_resched)
|
|
#ifdef notyet
|
|
movl sp@+,a1 | XXX - Make this work!
|
|
cmpl a0,a1 | switching to same proc?
|
|
jeq Lswdone | yes, skip save and restore
|
|
#endif
|
|
/*
|
|
* Save state of previous process in its pcb.
|
|
*/
|
|
movl _C_LABEL(curpcb),a1
|
|
moveml #0xFCFC,a1@(PCB_REGS) | save non-scratch registers
|
|
movl usp,a2 | grab USP (a2 has been saved)
|
|
movl a2,a1@(PCB_USP) | and save it
|
|
|
|
tstl _C_LABEL(fputype) | Do we have an fpu?
|
|
jeq Lswnofpsave | No? Then don't try save.
|
|
lea a1@(PCB_FPCTX),a2 | pointer to FP save area
|
|
fsave a2@ | save FP state
|
|
tstb a2@ | null state frame?
|
|
jeq Lswnofpsave | yes, all done
|
|
fmovem fp0-fp7,a2@(FPF_REGS) | save FP general regs
|
|
fmovem fpcr/fpsr/fpi,a2@(FPF_FPCR) | save FP control regs
|
|
Lswnofpsave:
|
|
|
|
/*
|
|
* Now that we have saved all the registers that must be
|
|
* preserved, we are free to use those registers until
|
|
* we load the registers for the switched-to process.
|
|
* In this section, keep: a0=curproc, a1=curpcb
|
|
*/
|
|
|
|
#ifdef DIAGNOSTIC
|
|
tstl a0@(P_WCHAN)
|
|
jne Lbadsw
|
|
cmpb #SRUN,a0@(P_STAT)
|
|
jne Lbadsw
|
|
#endif
|
|
clrl a0@(P_BACK) | clear back link
|
|
movl a0@(P_ADDR),a1 | get p_addr
|
|
movl a1,_C_LABEL(curpcb)
|
|
|
|
/*
|
|
* Load the new VM context (new MMU root pointer)
|
|
*/
|
|
movl a0@(P_VMSPACE),a2 | vm = p->p_vmspace
|
|
#ifdef DIAGNOSTIC
|
|
tstl a2 | vm == VM_MAP_NULL?
|
|
jeq Lbadsw | panic
|
|
#endif
|
|
#ifdef PMAP_DEBUG
|
|
/*
|
|
* Just call pmap_activate() for now. Later on,
|
|
* use the in-line version below (for speed).
|
|
*/
|
|
movl a2@(VM_PMAP),a2 | pmap = vm->vm_map.pmap
|
|
pea a2@ | push pmap
|
|
jbsr _C_LABEL(pmap_activate) | pmap_activate(pmap)
|
|
addql #4,sp
|
|
movl _C_LABEL(curpcb),a1 | restore p_addr
|
|
#else
|
|
/* XXX - Later, use this inline version. */
|
|
/* Just load the new CPU Root Pointer (MMU) */
|
|
lea _C_LABEL(kernel_crp), a3 | our CPU Root Ptr. (CRP)
|
|
movl a2@(VM_PMAP),a2 | pmap = vm->vm_map.pmap
|
|
movl a2@(PM_A_PHYS),d0 | phys = pmap->pm_a_phys
|
|
cmpl a3@(4),d0 | == kernel_crp.rp_addr ?
|
|
jeq Lsame_mmuctx | skip loadcrp/flush
|
|
/* OK, it is a new MMU context. Load it up. */
|
|
movl d0,a3@(4)
|
|
movl #CACHE_CLR,d0
|
|
movc d0,cacr | invalidate cache(s)
|
|
pflusha | flush entire TLB
|
|
pmove a3@,crp | load new user root pointer
|
|
Lsame_mmuctx:
|
|
#endif
|
|
|
|
/*
|
|
* Reload the registers for the new process.
|
|
* After this point we can only use d0,d1,a0,a1
|
|
*/
|
|
moveml a1@(PCB_REGS),#0xFCFC | reload registers
|
|
movl a1@(PCB_USP),a0
|
|
movl a0,usp | and USP
|
|
|
|
tstl _C_LABEL(fputype) | If we don't have an fpu,
|
|
jeq Lres_skip | don't try to restore it.
|
|
lea a1@(PCB_FPCTX),a0 | pointer to FP save area
|
|
tstb a0@ | null state frame?
|
|
jeq Lresfprest | yes, easy
|
|
fmovem a0@(FPF_FPCR),fpcr/fpsr/fpi | restore FP control regs
|
|
fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general regs
|
|
Lresfprest:
|
|
frestore a0@ | restore state
|
|
Lres_skip:
|
|
movw a1@(PCB_PS),d0 | no, restore PS
|
|
#ifdef DIAGNOSTIC
|
|
btst #13,d0 | supervisor mode?
|
|
jeq Lbadsw | no? panic!
|
|
#endif
|
|
movw d0,sr | OK, restore PS
|
|
moveq #1,d0 | return 1 (for alternate returns)
|
|
rts
|
|
|
|
/*
|
|
* savectx(pcb)
|
|
* Update pcb, saving current processor state.
|
|
*/
|
|
ENTRY(savectx)
|
|
movl sp@(4),a1
|
|
movw sr,a1@(PCB_PS)
|
|
movl usp,a0 | grab USP
|
|
movl a0,a1@(PCB_USP) | and save it
|
|
moveml #0xFCFC,a1@(PCB_REGS) | save non-scratch registers
|
|
|
|
tstl _C_LABEL(fputype) | Do we have FPU?
|
|
jeq Lsavedone | No? Then don't save state.
|
|
lea a1@(PCB_FPCTX),a0 | pointer to FP save area
|
|
fsave a0@ | save FP state
|
|
tstb a0@ | null state frame?
|
|
jeq Lsavedone | yes, all done
|
|
fmovem fp0-fp7,a0@(FPF_REGS) | save FP general regs
|
|
fmovem fpcr/fpsr/fpi,a0@(FPF_FPCR) | save FP control regs
|
|
Lsavedone:
|
|
moveq #0,d0 | return 0
|
|
rts
|
|
|
|
/* suline() */
|
|
|
|
#ifdef DEBUG
|
|
.data
|
|
ASGLOBAL(fulltflush)
|
|
.long 0
|
|
ASGLOBAL(fullcflush)
|
|
.long 0
|
|
.text
|
|
#endif
|
|
|
|
/*
|
|
* Invalidate entire TLB.
|
|
*/
|
|
ENTRY(TBIA)
|
|
_C_LABEL(_TBIA):
|
|
pflusha
|
|
movl #DC_CLEAR,d0
|
|
movc d0,cacr | invalidate on-chip d-cache
|
|
rts
|
|
|
|
/*
|
|
* Invalidate any TLB entry for given VA (TB Invalidate Single)
|
|
*/
|
|
ENTRY(TBIS)
|
|
#ifdef DEBUG
|
|
tstl _ASM_LABEL(fulltflush) | being conservative?
|
|
jne _C_LABEL(_TBIA) | yes, flush entire TLB
|
|
#endif
|
|
movl sp@(4),a0
|
|
pflush #0,#0,a0@ | flush address from both sides
|
|
movl #DC_CLEAR,d0
|
|
movc d0,cacr | invalidate on-chip data cache
|
|
rts
|
|
|
|
/*
|
|
* Invalidate supervisor side of TLB
|
|
*/
|
|
ENTRY(TBIAS)
|
|
#ifdef DEBUG
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tstl _ASM_LABEL(fulltflush) | being conservative?
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jne _C_LABEL(_TBIA) | yes, flush everything
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#endif
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pflush #4,#4 | flush supervisor TLB entries
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movl #DC_CLEAR,d0
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movc d0,cacr | invalidate on-chip d-cache
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rts
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/*
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* Invalidate user side of TLB
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*/
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ENTRY(TBIAU)
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#ifdef DEBUG
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tstl _ASM_LABEL(fulltflush) | being conservative?
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jne _C_LABEL(_TBIA) | yes, flush everything
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#endif
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pflush #0,#4 | flush user TLB entries
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movl #DC_CLEAR,d0
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movc d0,cacr | invalidate on-chip d-cache
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rts
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/*
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* Invalidate instruction cache
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*/
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ENTRY(ICIA)
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movl #IC_CLEAR,d0
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movc d0,cacr | invalidate i-cache
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rts
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/*
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* Invalidate data cache.
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* NOTE: we do not flush 68030 on-chip cache as there are no aliasing
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* problems with DC_WA. The only cases we have to worry about are context
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* switch and TLB changes, both of which are handled "in-line" in resume
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* and TBI*.
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*/
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ENTRY(DCIA)
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__DCIA:
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rts
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ENTRY(DCIS)
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__DCIS:
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rts
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/*
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* Invalidate data cache.
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*/
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ENTRY(DCIU)
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movl #DC_CLEAR,d0
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movc d0,cacr | invalidate on-chip d-cache
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rts
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/* ICPL, ICPP, DCPL, DCPP, DCPA, DCFL, DCFP */
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ENTRY(PCIA)
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movl #DC_CLEAR,d0
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movc d0,cacr | invalidate on-chip d-cache
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rts
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ENTRY(ecacheon)
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rts
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ENTRY(ecacheoff)
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rts
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/*
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* Get callers current SP value.
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* Note that simply taking the address of a local variable in a C function
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* doesn't work because callee saved registers may be outside the stack frame
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* defined by A6 (e.g. GCC generated code).
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*
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* [I don't think the ENTRY() macro will do the right thing with this -- glass]
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*/
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GLOBAL(getsp)
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movl sp,d0 | get current SP
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addql #4,d0 | compensate for return address
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rts
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ENTRY(getsfc)
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movc sfc,d0
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rts
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ENTRY(getdfc)
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movc dfc,d0
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rts
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ENTRY(getvbr)
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movc vbr, d0
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rts
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ENTRY(setvbr)
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movl sp@(4), d0
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movc d0, vbr
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rts
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/*
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* Load a new CPU Root Pointer (CRP) into the MMU.
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* void loadcrp(struct mmu_rootptr *);
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*/
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ENTRY(loadcrp)
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movl sp@(4),a0 | arg1: &CRP
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movl #CACHE_CLR,d0
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movc d0,cacr | invalidate cache(s)
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pflusha | flush entire TLB
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pmove a0@,crp | load new user root pointer
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rts
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/*
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* Get the physical address of the PTE for a given VA.
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*/
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ENTRY(ptest_addr)
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movl sp@(4),a0 | VA
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ptestr #5,a0@,#7,a1 | a1 = addr of PTE
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movl a1,d0
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rts
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/*
|
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* Set processor priority level calls. Most are implemented with
|
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* inline asm expansions. However, we need one instantiation here
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* in case some non-optimized code makes external references.
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* Most places will use the inlined function param.h supplies.
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*/
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ENTRY(_spl)
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movl sp@(4),d1
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clrl d0
|
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movw sr,d0
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movw d1,sr
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rts
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ENTRY(getsr)
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moveq #0, d0
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movw sr, d0
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rts
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|
|
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/*
|
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* Save and restore 68881 state.
|
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*/
|
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ENTRY(m68881_save)
|
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movl sp@(4),a0 | save area pointer
|
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fsave a0@ | save state
|
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tstb a0@ | null state frame?
|
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jeq Lm68881sdone | yes, all done
|
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fmovem fp0-fp7,a0@(FPF_REGS) | save FP general regs
|
|
fmovem fpcr/fpsr/fpi,a0@(FPF_FPCR) | save FP control regs
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|
Lm68881sdone:
|
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rts
|
|
|
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ENTRY(m68881_restore)
|
|
movl sp@(4),a0 | save area pointer
|
|
tstb a0@ | null state frame?
|
|
jeq Lm68881rdone | yes, easy
|
|
fmovem a0@(FPF_FPCR),fpcr/fpsr/fpi | restore FP control regs
|
|
fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general regs
|
|
Lm68881rdone:
|
|
frestore a0@ | restore state
|
|
rts
|
|
|
|
/*
|
|
* _delay(unsigned N)
|
|
* Delay for at least (N/256) microseconds.
|
|
* This routine depends on the variable: delay_divisor
|
|
* which should be set based on the CPU clock rate.
|
|
* XXX: Currently this is set in sun3_startup.c based on the
|
|
* XXX: CPU model but this should be determined at run time...
|
|
*/
|
|
GLOBAL(_delay)
|
|
| d0 = arg = (usecs << 8)
|
|
movl sp@(4),d0
|
|
| d1 = delay_divisor;
|
|
movl _C_LABEL(delay_divisor),d1
|
|
L_delay:
|
|
subl d1,d0
|
|
jgt L_delay
|
|
rts
|
|
|
|
|
|
| Define some addresses, mostly so DDB can print useful info.
|
|
.globl _C_LABEL(kernbase)
|
|
.set _C_LABEL(kernbase),KERNBASE
|
|
.globl _C_LABEL(dvma_base)
|
|
.set _C_LABEL(dvma_base),DVMA_SPACE_START
|
|
.globl _C_LABEL(prom_start)
|
|
.set _C_LABEL(prom_start),MONSTART
|
|
.globl _C_LABEL(prom_base)
|
|
.set _C_LABEL(prom_base),PROM_BASE
|
|
|
|
|The end!
|