657 строки
17 KiB
ArmAsm
657 строки
17 KiB
ArmAsm
/*
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* Kernel execution entry point code.
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*
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* Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org>
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* Initial PowerPC version.
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* Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu>
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* Rewritten for PReP
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* Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
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* Low-level exception handers, MMU support, and rewrite.
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* Copyright (c) 1997 Dan Malek <dmalek@jlc.net>
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* PowerPC 8xx modifications.
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* Copyright (c) 1998-1999 TiVo, Inc.
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* PowerPC 403GCX modifications.
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* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
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* PowerPC 403GCX/405GP modifications.
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* Copyright 2000 MontaVista Software Inc.
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* PPC405 modifications
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* PowerPC 403GCX/405GP modifications.
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* Author: MontaVista Software, Inc.
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* frank_rowand@mvista.com or source@mvista.com
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* debbie_chu@mvista.com
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* Copyright 2002-2005 MontaVista Software, Inc.
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* PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include "head_booke.h"
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/* As with the other PowerPC ports, it is expected that when code
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* execution begins here, the following registers contain valid, yet
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* optional, information:
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*
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* r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
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* r4 - Starting address of the init RAM disk
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* r5 - Ending address of the init RAM disk
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* r6 - Start of kernel command line string (e.g. "mem=128")
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* r7 - End of kernel command line string
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*
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*/
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.section .text.head, "ax"
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_ENTRY(_stext);
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_ENTRY(_start);
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/*
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* Reserve a word at a fixed location to store the address
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* of abatron_pteptrs
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*/
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nop
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/*
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* Save parameters we are passed
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*/
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mr r31,r3
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mr r30,r4
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mr r29,r5
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mr r28,r6
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mr r27,r7
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li r24,0 /* CPU number */
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/*
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* Set up the initial MMU state
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*
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* We are still executing code at the virtual address
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* mappings set by the firmware for the base of RAM.
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*
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* We first invalidate all TLB entries but the one
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* we are running from. We then load the KERNELBASE
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* mappings so we can begin to use kernel addresses
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* natively and so the interrupt vector locations are
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* permanently pinned (necessary since Book E
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* implementations always have translation enabled).
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*
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* TODO: Use the known TLB entry we are running from to
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* determine which physical region we are located
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* in. This can be used to determine where in RAM
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* (on a shared CPU system) or PCI memory space
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* (on a DRAMless system) we are located.
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* For now, we assume a perfect world which means
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* we are located at the base of DRAM (physical 0).
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*/
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/*
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* Search TLB for entry that we are currently using.
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* Invalidate all entries but the one we are using.
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*/
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/* Load our current PID->MMUCR TID and MSR IS->MMUCR STS */
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mfspr r3,SPRN_PID /* Get PID */
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mfmsr r4 /* Get MSR */
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andi. r4,r4,MSR_IS@l /* TS=1? */
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beq wmmucr /* If not, leave STS=0 */
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oris r3,r3,PPC44x_MMUCR_STS@h /* Set STS=1 */
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wmmucr: mtspr SPRN_MMUCR,r3 /* Put MMUCR */
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sync
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bl invstr /* Find our address */
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invstr: mflr r5 /* Make it accessible */
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tlbsx r23,0,r5 /* Find entry we are in */
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li r4,0 /* Start at TLB entry 0 */
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li r3,0 /* Set PAGEID inval value */
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1: cmpw r23,r4 /* Is this our entry? */
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beq skpinv /* If so, skip the inval */
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tlbwe r3,r4,PPC44x_TLB_PAGEID /* If not, inval the entry */
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skpinv: addi r4,r4,1 /* Increment */
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cmpwi r4,64 /* Are we done? */
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bne 1b /* If not, repeat */
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isync /* If so, context change */
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/*
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* Configure and load pinned entry into TLB slot 63.
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*/
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lis r3,PAGE_OFFSET@h
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ori r3,r3,PAGE_OFFSET@l
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/* Kernel is at the base of RAM */
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li r4, 0 /* Load the kernel physical address */
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/* Load the kernel PID = 0 */
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li r0,0
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mtspr SPRN_PID,r0
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sync
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/* Initialize MMUCR */
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li r5,0
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mtspr SPRN_MMUCR,r5
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sync
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/* pageid fields */
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clrrwi r3,r3,10 /* Mask off the effective page number */
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ori r3,r3,PPC44x_TLB_VALID | PPC44x_TLB_256M
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/* xlat fields */
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clrrwi r4,r4,10 /* Mask off the real page number */
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/* ERPN is 0 for first 4GB page */
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/* attrib fields */
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/* Added guarded bit to protect against speculative loads/stores */
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li r5,0
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ori r5,r5,(PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G)
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li r0,63 /* TLB slot 63 */
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tlbwe r3,r0,PPC44x_TLB_PAGEID /* Load the pageid fields */
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tlbwe r4,r0,PPC44x_TLB_XLAT /* Load the translation fields */
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tlbwe r5,r0,PPC44x_TLB_ATTRIB /* Load the attrib/access fields */
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/* Force context change */
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mfmsr r0
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mtspr SPRN_SRR1, r0
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lis r0,3f@h
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ori r0,r0,3f@l
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mtspr SPRN_SRR0,r0
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sync
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rfi
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/* If necessary, invalidate original entry we used */
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3: cmpwi r23,63
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beq 4f
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li r6,0
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tlbwe r6,r23,PPC44x_TLB_PAGEID
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isync
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4:
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#ifdef CONFIG_PPC_EARLY_DEBUG_44x
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/* Add UART mapping for early debug. */
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/* pageid fields */
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lis r3,PPC44x_EARLY_DEBUG_VIRTADDR@h
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ori r3,r3,PPC44x_TLB_VALID|PPC44x_TLB_TS|PPC44x_TLB_64K
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/* xlat fields */
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lis r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW@h
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ori r4,r4,CONFIG_PPC_EARLY_DEBUG_44x_PHYSHIGH
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/* attrib fields */
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li r5,(PPC44x_TLB_SW|PPC44x_TLB_SR|PPC44x_TLB_I|PPC44x_TLB_G)
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li r0,62 /* TLB slot 0 */
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tlbwe r3,r0,PPC44x_TLB_PAGEID
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tlbwe r4,r0,PPC44x_TLB_XLAT
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tlbwe r5,r0,PPC44x_TLB_ATTRIB
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/* Force context change */
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isync
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#endif /* CONFIG_PPC_EARLY_DEBUG_44x */
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/* Establish the interrupt vector offsets */
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SET_IVOR(0, CriticalInput);
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SET_IVOR(1, MachineCheck);
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SET_IVOR(2, DataStorage);
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SET_IVOR(3, InstructionStorage);
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SET_IVOR(4, ExternalInput);
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SET_IVOR(5, Alignment);
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SET_IVOR(6, Program);
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SET_IVOR(7, FloatingPointUnavailable);
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SET_IVOR(8, SystemCall);
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SET_IVOR(9, AuxillaryProcessorUnavailable);
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SET_IVOR(10, Decrementer);
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SET_IVOR(11, FixedIntervalTimer);
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SET_IVOR(12, WatchdogTimer);
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SET_IVOR(13, DataTLBError);
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SET_IVOR(14, InstructionTLBError);
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SET_IVOR(15, DebugCrit);
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/* Establish the interrupt vector base */
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lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
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mtspr SPRN_IVPR,r4
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/*
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* This is where the main kernel code starts.
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*/
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/* ptr to current */
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lis r2,init_task@h
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ori r2,r2,init_task@l
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/* ptr to current thread */
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addi r4,r2,THREAD /* init task's THREAD */
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mtspr SPRN_SPRG3,r4
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/* stack */
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lis r1,init_thread_union@h
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ori r1,r1,init_thread_union@l
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li r0,0
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stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
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bl early_init
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/*
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* Decide what sort of machine this is and initialize the MMU.
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*/
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mr r3,r31
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mr r4,r30
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mr r5,r29
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mr r6,r28
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mr r7,r27
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bl machine_init
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bl MMU_init
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/* Setup PTE pointers for the Abatron bdiGDB */
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lis r6, swapper_pg_dir@h
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ori r6, r6, swapper_pg_dir@l
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lis r5, abatron_pteptrs@h
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ori r5, r5, abatron_pteptrs@l
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lis r4, KERNELBASE@h
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ori r4, r4, KERNELBASE@l
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stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
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stw r6, 0(r5)
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/* Let's move on */
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lis r4,start_kernel@h
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ori r4,r4,start_kernel@l
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lis r3,MSR_KERNEL@h
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ori r3,r3,MSR_KERNEL@l
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mtspr SPRN_SRR0,r4
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mtspr SPRN_SRR1,r3
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rfi /* change context and jump to start_kernel */
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/*
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* Interrupt vector entry code
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*
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* The Book E MMUs are always on so we don't need to handle
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* interrupts in real mode as with previous PPC processors. In
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* this case we handle interrupts in the kernel virtual address
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* space.
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*
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* Interrupt vectors are dynamically placed relative to the
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* interrupt prefix as determined by the address of interrupt_base.
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* The interrupt vectors offsets are programmed using the labels
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* for each interrupt vector entry.
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*
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* Interrupt vectors must be aligned on a 16 byte boundary.
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* We align on a 32 byte cache line boundary for good measure.
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*/
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interrupt_base:
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/* Critical Input Interrupt */
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CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception)
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/* Machine Check Interrupt */
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CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
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MCHECK_EXCEPTION(0x0210, MachineCheckA, machine_check_exception)
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/* Data Storage Interrupt */
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DATA_STORAGE_EXCEPTION
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/* Instruction Storage Interrupt */
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INSTRUCTION_STORAGE_EXCEPTION
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/* External Input Interrupt */
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EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE)
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/* Alignment Interrupt */
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ALIGNMENT_EXCEPTION
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/* Program Interrupt */
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PROGRAM_EXCEPTION
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/* Floating Point Unavailable Interrupt */
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#ifdef CONFIG_PPC_FPU
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FP_UNAVAILABLE_EXCEPTION
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#else
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EXCEPTION(0x2010, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE)
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#endif
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/* System Call Interrupt */
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START_EXCEPTION(SystemCall)
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NORMAL_EXCEPTION_PROLOG
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EXC_XFER_EE_LITE(0x0c00, DoSyscall)
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/* Auxillary Processor Unavailable Interrupt */
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EXCEPTION(0x2020, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE)
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/* Decrementer Interrupt */
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DECREMENTER_EXCEPTION
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/* Fixed Internal Timer Interrupt */
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/* TODO: Add FIT support */
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EXCEPTION(0x1010, FixedIntervalTimer, unknown_exception, EXC_XFER_EE)
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/* Watchdog Timer Interrupt */
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/* TODO: Add watchdog support */
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#ifdef CONFIG_BOOKE_WDT
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CRITICAL_EXCEPTION(0x1020, WatchdogTimer, WatchdogException)
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#else
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CRITICAL_EXCEPTION(0x1020, WatchdogTimer, unknown_exception)
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#endif
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/* Data TLB Error Interrupt */
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START_EXCEPTION(DataTLBError)
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mtspr SPRN_SPRG0, r10 /* Save some working registers */
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mtspr SPRN_SPRG1, r11
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mtspr SPRN_SPRG4W, r12
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mtspr SPRN_SPRG5W, r13
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mfcr r11
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mtspr SPRN_SPRG7W, r11
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mfspr r10, SPRN_DEAR /* Get faulting address */
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/* If we are faulting a kernel address, we have to use the
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* kernel page tables.
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*/
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lis r11, PAGE_OFFSET@h
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cmplw r10, r11
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blt+ 3f
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lis r11, swapper_pg_dir@h
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ori r11, r11, swapper_pg_dir@l
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mfspr r12,SPRN_MMUCR
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rlwinm r12,r12,0,0,23 /* Clear TID */
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b 4f
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/* Get the PGD for the current thread */
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3:
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mfspr r11,SPRN_SPRG3
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lwz r11,PGDIR(r11)
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/* Load PID into MMUCR TID */
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mfspr r12,SPRN_MMUCR
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mfspr r13,SPRN_PID /* Get PID */
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rlwimi r12,r13,0,24,31 /* Set TID */
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4:
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mtspr SPRN_MMUCR,r12
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/* Mask of required permission bits. Note that while we
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* do copy ESR:ST to _PAGE_RW position as trying to write
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* to an RO page is pretty common, we don't do it with
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* _PAGE_DIRTY. We could do it, but it's a fairly rare
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* event so I'd rather take the overhead when it happens
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* rather than adding an instruction here. We should measure
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* whether the whole thing is worth it in the first place
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* as we could avoid loading SPRN_ESR completely in the first
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* place...
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*
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* TODO: Is it worth doing that mfspr & rlwimi in the first
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* place or can we save a couple of instructions here ?
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*/
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mfspr r12,SPRN_ESR
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li r13,_PAGE_PRESENT|_PAGE_ACCESSED
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rlwimi r13,r12,10,30,30
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/* Load the PTE */
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rlwinm r12, r10, 13, 19, 29 /* Compute pgdir/pmd offset */
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lwzx r11, r12, r11 /* Get pgd/pmd entry */
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rlwinm. r12, r11, 0, 0, 20 /* Extract pt base address */
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beq 2f /* Bail if no table */
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rlwimi r12, r10, 23, 20, 28 /* Compute pte address */
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lwz r11, 0(r12) /* Get high word of pte entry */
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lwz r12, 4(r12) /* Get low word of pte entry */
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lis r10,tlb_44x_index@ha
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andc. r13,r13,r12 /* Check permission */
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/* Load the next available TLB index */
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lwz r13,tlb_44x_index@l(r10)
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bne 2f /* Bail if permission mismach */
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/* Increment, rollover, and store TLB index */
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addi r13,r13,1
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/* Compare with watermark (instruction gets patched) */
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.globl tlb_44x_patch_hwater_D
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tlb_44x_patch_hwater_D:
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cmpwi 0,r13,1 /* reserve entries */
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ble 5f
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li r13,0
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5:
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/* Store the next available TLB index */
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stw r13,tlb_44x_index@l(r10)
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/* Re-load the faulting address */
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mfspr r10,SPRN_DEAR
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/* Jump to common tlb load */
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b finish_tlb_load
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2:
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/* The bailout. Restore registers to pre-exception conditions
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* and call the heavyweights to help us out.
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*/
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mfspr r11, SPRN_SPRG7R
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mtcr r11
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mfspr r13, SPRN_SPRG5R
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mfspr r12, SPRN_SPRG4R
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mfspr r11, SPRN_SPRG1
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mfspr r10, SPRN_SPRG0
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b DataStorage
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/* Instruction TLB Error Interrupt */
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/*
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* Nearly the same as above, except we get our
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* information from different registers and bailout
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* to a different point.
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*/
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START_EXCEPTION(InstructionTLBError)
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mtspr SPRN_SPRG0, r10 /* Save some working registers */
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mtspr SPRN_SPRG1, r11
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mtspr SPRN_SPRG4W, r12
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mtspr SPRN_SPRG5W, r13
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mfcr r11
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mtspr SPRN_SPRG7W, r11
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mfspr r10, SPRN_SRR0 /* Get faulting address */
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/* If we are faulting a kernel address, we have to use the
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* kernel page tables.
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*/
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lis r11, PAGE_OFFSET@h
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cmplw r10, r11
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blt+ 3f
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lis r11, swapper_pg_dir@h
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ori r11, r11, swapper_pg_dir@l
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mfspr r12,SPRN_MMUCR
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rlwinm r12,r12,0,0,23 /* Clear TID */
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b 4f
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/* Get the PGD for the current thread */
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3:
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mfspr r11,SPRN_SPRG3
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lwz r11,PGDIR(r11)
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/* Load PID into MMUCR TID */
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mfspr r12,SPRN_MMUCR
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mfspr r13,SPRN_PID /* Get PID */
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rlwimi r12,r13,0,24,31 /* Set TID */
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4:
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mtspr SPRN_MMUCR,r12
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/* Make up the required permissions */
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li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_HWEXEC
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rlwinm r12, r10, 13, 19, 29 /* Compute pgdir/pmd offset */
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lwzx r11, r12, r11 /* Get pgd/pmd entry */
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rlwinm. r12, r11, 0, 0, 20 /* Extract pt base address */
|
|
beq 2f /* Bail if no table */
|
|
|
|
rlwimi r12, r10, 23, 20, 28 /* Compute pte address */
|
|
lwz r11, 0(r12) /* Get high word of pte entry */
|
|
lwz r12, 4(r12) /* Get low word of pte entry */
|
|
|
|
lis r10,tlb_44x_index@ha
|
|
|
|
andc. r13,r13,r12 /* Check permission */
|
|
|
|
/* Load the next available TLB index */
|
|
lwz r13,tlb_44x_index@l(r10)
|
|
|
|
bne 2f /* Bail if permission mismach */
|
|
|
|
/* Increment, rollover, and store TLB index */
|
|
addi r13,r13,1
|
|
|
|
/* Compare with watermark (instruction gets patched) */
|
|
.globl tlb_44x_patch_hwater_I
|
|
tlb_44x_patch_hwater_I:
|
|
cmpwi 0,r13,1 /* reserve entries */
|
|
ble 5f
|
|
li r13,0
|
|
5:
|
|
/* Store the next available TLB index */
|
|
stw r13,tlb_44x_index@l(r10)
|
|
|
|
/* Re-load the faulting address */
|
|
mfspr r10,SPRN_SRR0
|
|
|
|
/* Jump to common TLB load point */
|
|
b finish_tlb_load
|
|
|
|
2:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out.
|
|
*/
|
|
mfspr r11, SPRN_SPRG7R
|
|
mtcr r11
|
|
mfspr r13, SPRN_SPRG5R
|
|
mfspr r12, SPRN_SPRG4R
|
|
mfspr r11, SPRN_SPRG1
|
|
mfspr r10, SPRN_SPRG0
|
|
b InstructionStorage
|
|
|
|
/* Debug Interrupt */
|
|
DEBUG_CRIT_EXCEPTION
|
|
|
|
/*
|
|
* Local functions
|
|
*/
|
|
|
|
/*
|
|
|
|
* Both the instruction and data TLB miss get to this
|
|
* point to load the TLB.
|
|
* r10 - EA of fault
|
|
* r11 - PTE high word value
|
|
* r12 - PTE low word value
|
|
* r13 - TLB index
|
|
* MMUCR - loaded with proper value when we get here
|
|
* Upon exit, we reload everything and RFI.
|
|
*/
|
|
finish_tlb_load:
|
|
/* Combine RPN & ERPN an write WS 0 */
|
|
rlwimi r11,r12,0,0,19
|
|
tlbwe r11,r13,PPC44x_TLB_XLAT
|
|
|
|
/*
|
|
* Create WS1. This is the faulting address (EPN),
|
|
* page size, and valid flag.
|
|
*/
|
|
li r11,PPC44x_TLB_VALID | PPC44x_TLB_4K
|
|
rlwimi r10,r11,0,20,31 /* Insert valid and page size*/
|
|
tlbwe r10,r13,PPC44x_TLB_PAGEID /* Write PAGEID */
|
|
|
|
/* And WS 2 */
|
|
li r10,0xf85 /* Mask to apply from PTE */
|
|
rlwimi r10,r12,29,30,30 /* DIRTY -> SW position */
|
|
and r11,r12,r10 /* Mask PTE bits to keep */
|
|
andi. r10,r12,_PAGE_USER /* User page ? */
|
|
beq 1f /* nope, leave U bits empty */
|
|
rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */
|
|
1: tlbwe r11,r13,PPC44x_TLB_ATTRIB /* Write ATTRIB */
|
|
|
|
/* Done...restore registers and get out of here.
|
|
*/
|
|
mfspr r11, SPRN_SPRG7R
|
|
mtcr r11
|
|
mfspr r13, SPRN_SPRG5R
|
|
mfspr r12, SPRN_SPRG4R
|
|
mfspr r11, SPRN_SPRG1
|
|
mfspr r10, SPRN_SPRG0
|
|
rfi /* Force context change */
|
|
|
|
/*
|
|
* Global functions
|
|
*/
|
|
|
|
/*
|
|
* Adjust the machine check IVOR on 440A cores
|
|
*/
|
|
_GLOBAL(__fixup_440A_mcheck)
|
|
li r3,MachineCheckA@l
|
|
mtspr SPRN_IVOR1,r3
|
|
sync
|
|
blr
|
|
|
|
/*
|
|
* extern void giveup_altivec(struct task_struct *prev)
|
|
*
|
|
* The 44x core does not have an AltiVec unit.
|
|
*/
|
|
_GLOBAL(giveup_altivec)
|
|
blr
|
|
|
|
/*
|
|
* extern void giveup_fpu(struct task_struct *prev)
|
|
*
|
|
* The 44x core does not have an FPU.
|
|
*/
|
|
#ifndef CONFIG_PPC_FPU
|
|
_GLOBAL(giveup_fpu)
|
|
blr
|
|
#endif
|
|
|
|
_GLOBAL(set_context)
|
|
|
|
#ifdef CONFIG_BDI_SWITCH
|
|
/* Context switch the PTE pointer for the Abatron BDI2000.
|
|
* The PGDIR is the second parameter.
|
|
*/
|
|
lis r5, abatron_pteptrs@h
|
|
ori r5, r5, abatron_pteptrs@l
|
|
stw r4, 0x4(r5)
|
|
#endif
|
|
mtspr SPRN_PID,r3
|
|
isync /* Force context change */
|
|
blr
|
|
|
|
/*
|
|
* We put a few things here that have to be page-aligned. This stuff
|
|
* goes at the beginning of the data segment, which is page-aligned.
|
|
*/
|
|
.data
|
|
.align 12
|
|
.globl sdata
|
|
sdata:
|
|
.globl empty_zero_page
|
|
empty_zero_page:
|
|
.space 4096
|
|
|
|
/*
|
|
* To support >32-bit physical addresses, we use an 8KB pgdir.
|
|
*/
|
|
.globl swapper_pg_dir
|
|
swapper_pg_dir:
|
|
.space PGD_TABLE_SIZE
|
|
|
|
/*
|
|
* Room for two PTE pointers, usually the kernel and current user pointers
|
|
* to their respective root page table.
|
|
*/
|
|
abatron_pteptrs:
|
|
.space 8
|