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75b8247276
This patch has been reworked since RFC version. In the RFC, this patch was preceded by a patch clearing MSR RI for all PPC32 at all time at exception prologs. Now MSR RI clearing is done only when this 8xx perf events functionality is compiled in, it is therefore limited to 8xx and merged inside this patch. Other main changes have been to take into account detailed review from Peter Zijlstra. The instructions counter has been reworked to behave as a free running counter like the three other counters. The 8xx has no PMU, however some events can be emulated by other means. This patch implements the following events (as reported by 'perf list'): cpu-cycles OR cycles [Hardware event] instructions [Hardware event] dTLB-load-misses [Hardware cache event] iTLB-load-misses [Hardware cache event] 'cycles' event is implemented using the timebase clock. Timebase clock corresponds to CPU clock divided by 16, so number of cycles is approximatly 16 times the number of TB ticks On the 8xx, TLB misses are handled by software. It is therefore easy to count all TLB misses each time the TLB miss exception is called. 'instructions' is calculated by using instruction watchpoint counter. This patch sets counter A to count instructions at address greater than 0, hence we count all instructions executed while MSR RI bit is set. The counter is set to the maximum which is 0xffff. Every 65535 instructions, debug instruction breakpoint exception fires. The exception handler increments a counter in memory which then represent the upper part of the instruction counter. We therefore end up with a 48 bits counter. In order to avoid unnecessary overhead while no perf event is active, this counter is started when the first event referring to this counter is added, and the counter is stopped when the last event referring to it is deleted. In order to properly support breakpoint exceptions, MSR RI bit has to be unset in exception epilogs in order to avoid breakpoint exceptions during critical sections during changes to SRR0 and SRR1 would be problematic. All counters are handled as free running counters. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
1083 lines
31 KiB
ArmAsm
1083 lines
31 KiB
ArmAsm
/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
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* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
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* Low-level exception handlers and MMU support
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* rewritten by Paul Mackerras.
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* Copyright (C) 1996 Paul Mackerras.
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* MPC8xx modifications by Dan Malek
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* Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
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*
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* This file contains low-level support and setup for PowerPC 8xx
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* embedded processors, including trap and interrupt dispatch.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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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/cache.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 <asm/ptrace.h>
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#include <asm/fixmap.h>
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#include <asm/export.h>
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/* Macro to make the code more readable. */
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#ifdef CONFIG_8xx_CPU6
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#define SPRN_MI_TWC_ADDR 0x2b80
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#define SPRN_MI_RPN_ADDR 0x2d80
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#define SPRN_MD_TWC_ADDR 0x3b80
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#define SPRN_MD_RPN_ADDR 0x3d80
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#define MTSPR_CPU6(spr, reg, treg) \
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li treg, spr##_ADDR; \
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stw treg, 12(r0); \
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lwz treg, 12(r0); \
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mtspr spr, reg
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#else
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#define MTSPR_CPU6(spr, reg, treg) \
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mtspr spr, reg
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#endif
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/* Macro to test if an address is a kernel address */
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#if CONFIG_TASK_SIZE <= 0x80000000 && CONFIG_PAGE_OFFSET >= 0x80000000
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#define IS_KERNEL(tmp, addr) \
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andis. tmp, addr, 0x8000 /* Address >= 0x80000000 */
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#define BRANCH_UNLESS_KERNEL(label) beq label
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#else
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#define IS_KERNEL(tmp, addr) \
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rlwinm tmp, addr, 16, 16, 31; \
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cmpli cr0, tmp, PAGE_OFFSET >> 16
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#define BRANCH_UNLESS_KERNEL(label) blt label
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#endif
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/*
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* Value for the bits that have fixed value in RPN entries.
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* Also used for tagging DAR for DTLBerror.
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*/
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#ifdef CONFIG_PPC_16K_PAGES
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#define RPN_PATTERN (0x00f0 | MD_SPS16K)
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#else
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#define RPN_PATTERN 0x00f0
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#endif
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#define PAGE_SHIFT_512K 19
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#define PAGE_SHIFT_8M 23
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__HEAD
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_ENTRY(_stext);
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_ENTRY(_start);
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/* MPC8xx
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* This port was done on an MBX board with an 860. Right now I only
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* support an ELF compressed (zImage) boot from EPPC-Bug because the
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* code there loads up some registers before calling us:
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* r3: ptr to board info data
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* r4: initrd_start or if no initrd then 0
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* r5: initrd_end - unused if r4 is 0
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* r6: Start of command line string
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* r7: End of command line string
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*
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* I decided to use conditional compilation instead of checking PVR and
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* adding more processor specific branches around code I don't need.
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* Since this is an embedded processor, I also appreciate any memory
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* savings I can get.
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*
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* The MPC8xx does not have any BATs, but it supports large page sizes.
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* We first initialize the MMU to support 8M byte pages, then load one
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* entry into each of the instruction and data TLBs to map the first
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* 8M 1:1. I also mapped an additional I/O space 1:1 so we can get to
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* the "internal" processor registers before MMU_init is called.
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*
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* -- Dan
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*/
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.globl __start
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__start:
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mr r31,r3 /* save device tree ptr */
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/* We have to turn on the MMU right away so we get cache modes
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* set correctly.
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*/
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bl initial_mmu
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/* We now have the lower 8 Meg mapped into TLB entries, and the caches
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* ready to work.
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*/
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turn_on_mmu:
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mfmsr r0
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ori r0,r0,MSR_DR|MSR_IR
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mtspr SPRN_SRR1,r0
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lis r0,start_here@h
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ori r0,r0,start_here@l
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mtspr SPRN_SRR0,r0
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SYNC
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rfi /* enables MMU */
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/*
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* Exception entry code. This code runs with address translation
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* turned off, i.e. using physical addresses.
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* We assume sprg3 has the physical address of the current
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* task's thread_struct.
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*/
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#define EXCEPTION_PROLOG \
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EXCEPTION_PROLOG_0; \
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mfcr r10; \
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EXCEPTION_PROLOG_1; \
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EXCEPTION_PROLOG_2
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#define EXCEPTION_PROLOG_0 \
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mtspr SPRN_SPRG_SCRATCH0,r10; \
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mtspr SPRN_SPRG_SCRATCH1,r11
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#define EXCEPTION_PROLOG_1 \
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mfspr r11,SPRN_SRR1; /* check whether user or kernel */ \
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andi. r11,r11,MSR_PR; \
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tophys(r11,r1); /* use tophys(r1) if kernel */ \
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beq 1f; \
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mfspr r11,SPRN_SPRG_THREAD; \
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lwz r11,THREAD_INFO-THREAD(r11); \
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addi r11,r11,THREAD_SIZE; \
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tophys(r11,r11); \
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1: subi r11,r11,INT_FRAME_SIZE /* alloc exc. frame */
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#define EXCEPTION_PROLOG_2 \
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stw r10,_CCR(r11); /* save registers */ \
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stw r12,GPR12(r11); \
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stw r9,GPR9(r11); \
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mfspr r10,SPRN_SPRG_SCRATCH0; \
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stw r10,GPR10(r11); \
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mfspr r12,SPRN_SPRG_SCRATCH1; \
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stw r12,GPR11(r11); \
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mflr r10; \
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stw r10,_LINK(r11); \
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mfspr r12,SPRN_SRR0; \
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mfspr r9,SPRN_SRR1; \
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stw r1,GPR1(r11); \
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stw r1,0(r11); \
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tovirt(r1,r11); /* set new kernel sp */ \
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li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR); /* can take exceptions */ \
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MTMSRD(r10); /* (except for mach check in rtas) */ \
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stw r0,GPR0(r11); \
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SAVE_4GPRS(3, r11); \
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SAVE_2GPRS(7, r11)
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/*
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* Exception exit code.
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*/
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#define EXCEPTION_EPILOG_0 \
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mfspr r10,SPRN_SPRG_SCRATCH0; \
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mfspr r11,SPRN_SPRG_SCRATCH1
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/*
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* Note: code which follows this uses cr0.eq (set if from kernel),
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* r11, r12 (SRR0), and r9 (SRR1).
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*
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* Note2: once we have set r1 we are in a position to take exceptions
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* again, and we could thus set MSR:RI at that point.
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*/
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/*
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* Exception vectors.
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*/
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#define EXCEPTION(n, label, hdlr, xfer) \
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. = n; \
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label: \
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EXCEPTION_PROLOG; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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xfer(n, hdlr)
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#define EXC_XFER_TEMPLATE(n, hdlr, trap, copyee, tfer, ret) \
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li r10,trap; \
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stw r10,_TRAP(r11); \
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li r10,MSR_KERNEL; \
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copyee(r10, r9); \
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bl tfer; \
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i##n: \
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.long hdlr; \
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.long ret
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#define COPY_EE(d, s) rlwimi d,s,0,16,16
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#define NOCOPY(d, s)
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#define EXC_XFER_STD(n, hdlr) \
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EXC_XFER_TEMPLATE(n, hdlr, n, NOCOPY, transfer_to_handler_full, \
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ret_from_except_full)
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#define EXC_XFER_LITE(n, hdlr) \
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EXC_XFER_TEMPLATE(n, hdlr, n+1, NOCOPY, transfer_to_handler, \
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ret_from_except)
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#define EXC_XFER_EE(n, hdlr) \
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EXC_XFER_TEMPLATE(n, hdlr, n, COPY_EE, transfer_to_handler_full, \
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ret_from_except_full)
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#define EXC_XFER_EE_LITE(n, hdlr) \
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EXC_XFER_TEMPLATE(n, hdlr, n+1, COPY_EE, transfer_to_handler, \
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ret_from_except)
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/* System reset */
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EXCEPTION(0x100, Reset, system_reset_exception, EXC_XFER_STD)
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/* Machine check */
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. = 0x200
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MachineCheck:
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EXCEPTION_PROLOG
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mfspr r4,SPRN_DAR
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stw r4,_DAR(r11)
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li r5,RPN_PATTERN
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mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */
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mfspr r5,SPRN_DSISR
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stw r5,_DSISR(r11)
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addi r3,r1,STACK_FRAME_OVERHEAD
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EXC_XFER_STD(0x200, machine_check_exception)
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/* Data access exception.
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* This is "never generated" by the MPC8xx.
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*/
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. = 0x300
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DataAccess:
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/* Instruction access exception.
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* This is "never generated" by the MPC8xx.
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*/
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. = 0x400
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InstructionAccess:
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/* External interrupt */
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EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
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/* Alignment exception */
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. = 0x600
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Alignment:
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EXCEPTION_PROLOG
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mfspr r4,SPRN_DAR
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stw r4,_DAR(r11)
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li r5,RPN_PATTERN
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mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */
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mfspr r5,SPRN_DSISR
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stw r5,_DSISR(r11)
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addi r3,r1,STACK_FRAME_OVERHEAD
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EXC_XFER_EE(0x600, alignment_exception)
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/* Program check exception */
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EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
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/* No FPU on MPC8xx. This exception is not supposed to happen.
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*/
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EXCEPTION(0x800, FPUnavailable, unknown_exception, EXC_XFER_STD)
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/* Decrementer */
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EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
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EXCEPTION(0xa00, Trap_0a, unknown_exception, EXC_XFER_EE)
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EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_EE)
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/* System call */
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. = 0xc00
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SystemCall:
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EXCEPTION_PROLOG
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EXC_XFER_EE_LITE(0xc00, DoSyscall)
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/* Single step - not used on 601 */
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EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
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EXCEPTION(0xe00, Trap_0e, unknown_exception, EXC_XFER_EE)
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EXCEPTION(0xf00, Trap_0f, unknown_exception, EXC_XFER_EE)
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/* On the MPC8xx, this is a software emulation interrupt. It occurs
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* for all unimplemented and illegal instructions.
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*/
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EXCEPTION(0x1000, SoftEmu, SoftwareEmulation, EXC_XFER_STD)
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. = 0x1100
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/*
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* For the MPC8xx, this is a software tablewalk to load the instruction
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* TLB. The task switch loads the M_TW register with the pointer to the first
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* level table.
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* If we discover there is no second level table (value is zero) or if there
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* is an invalid pte, we load that into the TLB, which causes another fault
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* into the TLB Error interrupt where we can handle such problems.
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* We have to use the MD_xxx registers for the tablewalk because the
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* equivalent MI_xxx registers only perform the attribute functions.
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*/
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#ifdef CONFIG_8xx_CPU15
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#define INVALIDATE_ADJACENT_PAGES_CPU15(tmp, addr) \
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addi tmp, addr, PAGE_SIZE; \
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tlbie tmp; \
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addi tmp, addr, -PAGE_SIZE; \
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tlbie tmp
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#else
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#define INVALIDATE_ADJACENT_PAGES_CPU15(tmp, addr)
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#endif
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InstructionTLBMiss:
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#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
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mtspr SPRN_SPRG_SCRATCH2, r3
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#endif
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EXCEPTION_PROLOG_0
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#ifdef CONFIG_PPC_8xx_PERF_EVENT
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lis r10, (itlb_miss_counter - PAGE_OFFSET)@ha
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lwz r11, (itlb_miss_counter - PAGE_OFFSET)@l(r10)
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addi r11, r11, 1
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stw r11, (itlb_miss_counter - PAGE_OFFSET)@l(r10)
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#endif
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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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mfspr r10, SPRN_SRR0 /* Get effective address of fault */
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INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
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/* Only modules will cause ITLB Misses as we always
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* pin the first 8MB of kernel memory */
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#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
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mfcr r3
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#endif
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#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
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IS_KERNEL(r11, r10)
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#endif
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mfspr r11, SPRN_M_TW /* Get level 1 table */
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#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
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BRANCH_UNLESS_KERNEL(3f)
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lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
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3:
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#endif
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/* Insert level 1 index */
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rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
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lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
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/* Extract level 2 index */
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rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
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#ifdef CONFIG_HUGETLB_PAGE
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mtcr r11
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bt- 28, 10f /* bit 28 = Large page (8M) */
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bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
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#endif
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rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
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lwz r10, 0(r10) /* Get the pte */
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4:
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#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
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mtcr r3
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#endif
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/* Insert the APG into the TWC from the Linux PTE. */
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rlwimi r11, r10, 0, 25, 26
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/* Load the MI_TWC with the attributes for this "segment." */
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MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
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#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
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rlwimi r10, r11, 1, MI_SPS16K
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#endif
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#ifdef CONFIG_SWAP
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rlwinm r11, r10, 32-5, _PAGE_PRESENT
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and r11, r11, r10
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rlwimi r10, r11, 0, _PAGE_PRESENT
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#endif
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li r11, RPN_PATTERN
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/* The Linux PTE won't go exactly into the MMU TLB.
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* Software indicator bits 20-23 and 28 must be clear.
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* Software indicator bits 24, 25, 26, and 27 must be
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* set. All other Linux PTE bits control the behavior
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* of the MMU.
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*/
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#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
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rlwimi r10, r11, 0, 0x0ff0 /* Set 24-27, clear 20-23 */
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#else
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rlwimi r10, r11, 0, 0x0ff8 /* Set 24-27, clear 20-23,28 */
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#endif
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MTSPR_CPU6(SPRN_MI_RPN, r10, r3) /* Update TLB entry */
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/* Restore registers */
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#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
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mfspr r3, SPRN_SPRG_SCRATCH2
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#endif
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EXCEPTION_EPILOG_0
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rfi
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#ifdef CONFIG_HUGETLB_PAGE
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10: /* 8M pages */
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#ifdef CONFIG_PPC_16K_PAGES
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/* Extract level 2 index */
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rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
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/* Add level 2 base */
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rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
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#else
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/* Level 2 base */
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rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
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#endif
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
|
|
20: /* 512k pages */
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
#endif
|
|
|
|
. = 0x1200
|
|
DataStoreTLBMiss:
|
|
mtspr SPRN_SPRG_SCRATCH2, r3
|
|
EXCEPTION_PROLOG_0
|
|
#ifdef CONFIG_PPC_8xx_PERF_EVENT
|
|
lis r10, (dtlb_miss_counter - PAGE_OFFSET)@ha
|
|
lwz r11, (dtlb_miss_counter - PAGE_OFFSET)@l(r10)
|
|
addi r11, r11, 1
|
|
stw r11, (dtlb_miss_counter - PAGE_OFFSET)@l(r10)
|
|
#endif
|
|
mfcr r3
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
mfspr r10, SPRN_MD_EPN
|
|
rlwinm r10, r10, 16, 0xfff8
|
|
cmpli cr0, r10, PAGE_OFFSET@h
|
|
mfspr r11, SPRN_M_TW /* Get level 1 table */
|
|
blt+ 3f
|
|
#ifndef CONFIG_PIN_TLB_IMMR
|
|
cmpli cr0, r10, VIRT_IMMR_BASE@h
|
|
#endif
|
|
_ENTRY(DTLBMiss_cmp)
|
|
cmpli cr7, r10, (PAGE_OFFSET + 0x1800000)@h
|
|
lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
|
|
#ifndef CONFIG_PIN_TLB_IMMR
|
|
_ENTRY(DTLBMiss_jmp)
|
|
beq- DTLBMissIMMR
|
|
#endif
|
|
blt cr7, DTLBMissLinear
|
|
3:
|
|
mfspr r10, SPRN_MD_EPN
|
|
|
|
/* Insert level 1 index */
|
|
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
|
|
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
|
|
|
|
/* We have a pte table, so load fetch the pte from the table.
|
|
*/
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
mtcr r11
|
|
bt- 28, 10f /* bit 28 = Large page (8M) */
|
|
bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
|
|
#endif
|
|
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
4:
|
|
mtcr r3
|
|
|
|
/* Insert the Guarded flag and APG into the TWC from the Linux PTE.
|
|
* It is bit 26-27 of both the Linux PTE and the TWC (at least
|
|
* I got that right :-). It will be better when we can put
|
|
* this into the Linux pgd/pmd and load it in the operation
|
|
* above.
|
|
*/
|
|
rlwimi r11, r10, 0, 26, 27
|
|
/* Insert the WriteThru flag into the TWC from the Linux PTE.
|
|
* It is bit 25 in the Linux PTE and bit 30 in the TWC
|
|
*/
|
|
rlwimi r11, r10, 32-5, 30, 30
|
|
MTSPR_CPU6(SPRN_MD_TWC, r11, r3)
|
|
|
|
/* In 4k pages mode, SPS (bit 28) in RPN must match PS[1] (bit 29)
|
|
* In 16k pages mode, SPS is always 1 */
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 1, MD_SPS16K
|
|
#endif
|
|
/* Both _PAGE_ACCESSED and _PAGE_PRESENT has to be set.
|
|
* We also need to know if the insn is a load/store, so:
|
|
* Clear _PAGE_PRESENT and load that which will
|
|
* trap into DTLB Error with store bit set accordinly.
|
|
*/
|
|
/* PRESENT=0x1, ACCESSED=0x20
|
|
* r11 = ((r10 & PRESENT) & ((r10 & ACCESSED) >> 5));
|
|
* r10 = (r10 & ~PRESENT) | r11;
|
|
*/
|
|
#ifdef CONFIG_SWAP
|
|
rlwinm r11, r10, 32-5, _PAGE_PRESENT
|
|
and r11, r11, r10
|
|
rlwimi r10, r11, 0, _PAGE_PRESENT
|
|
#endif
|
|
/* The Linux PTE won't go exactly into the MMU TLB.
|
|
* Software indicator bits 22 and 28 must be clear.
|
|
* Software indicator bits 24, 25, 26, and 27 must be
|
|
* set. All other Linux PTE bits control the behavior
|
|
* of the MMU.
|
|
*/
|
|
li r11, RPN_PATTERN
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 0, 24, 27 /* Set 24-27 */
|
|
#else
|
|
rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */
|
|
#endif
|
|
rlwimi r10, r11, 0, 20, 20 /* clear 20 */
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r3) /* Update TLB entry */
|
|
|
|
/* Restore registers */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
10: /* 8M pages */
|
|
/* Extract level 2 index */
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
|
|
#else
|
|
/* Level 2 base */
|
|
rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
|
|
#endif
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
|
|
20: /* 512k pages */
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
#endif
|
|
|
|
/* This is an instruction TLB error on the MPC8xx. This could be due
|
|
* to many reasons, such as executing guarded memory or illegal instruction
|
|
* addresses. There is nothing to do but handle a big time error fault.
|
|
*/
|
|
. = 0x1300
|
|
InstructionTLBError:
|
|
EXCEPTION_PROLOG
|
|
mr r4,r12
|
|
mr r5,r9
|
|
andis. r10,r5,0x4000
|
|
beq+ 1f
|
|
tlbie r4
|
|
itlbie:
|
|
/* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
|
|
1: EXC_XFER_LITE(0x400, handle_page_fault)
|
|
|
|
/* This is the data TLB error on the MPC8xx. This could be due to
|
|
* many reasons, including a dirty update to a pte. We bail out to
|
|
* a higher level function that can handle it.
|
|
*/
|
|
. = 0x1400
|
|
DataTLBError:
|
|
EXCEPTION_PROLOG_0
|
|
mfcr r10
|
|
|
|
mfspr r11, SPRN_DAR
|
|
cmpwi cr0, r11, RPN_PATTERN
|
|
beq- FixupDAR /* must be a buggy dcbX, icbi insn. */
|
|
DARFixed:/* Return from dcbx instruction bug workaround */
|
|
EXCEPTION_PROLOG_1
|
|
EXCEPTION_PROLOG_2
|
|
mfspr r5,SPRN_DSISR
|
|
stw r5,_DSISR(r11)
|
|
mfspr r4,SPRN_DAR
|
|
andis. r10,r5,0x4000
|
|
beq+ 1f
|
|
tlbie r4
|
|
dtlbie:
|
|
1: li r10,RPN_PATTERN
|
|
mtspr SPRN_DAR,r10 /* Tag DAR, to be used in DTLB Error */
|
|
/* 0x300 is DataAccess exception, needed by bad_page_fault() */
|
|
EXC_XFER_LITE(0x300, handle_page_fault)
|
|
|
|
EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1a00, Trap_1a, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1b00, Trap_1b, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* On the MPC8xx, these next four traps are used for development
|
|
* support of breakpoints and such. Someday I will get around to
|
|
* using them.
|
|
*/
|
|
. = 0x1c00
|
|
DataBreakpoint:
|
|
EXCEPTION_PROLOG_0
|
|
mfcr r10
|
|
mfspr r11, SPRN_SRR0
|
|
cmplwi cr0, r11, (dtlbie - PAGE_OFFSET)@l
|
|
cmplwi cr7, r11, (itlbie - PAGE_OFFSET)@l
|
|
beq- cr0, 11f
|
|
beq- cr7, 11f
|
|
EXCEPTION_PROLOG_1
|
|
EXCEPTION_PROLOG_2
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
mfspr r4,SPRN_BAR
|
|
stw r4,_DAR(r11)
|
|
mfspr r5,SPRN_DSISR
|
|
EXC_XFER_EE(0x1c00, do_break)
|
|
11:
|
|
mtcr r10
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
#ifdef CONFIG_PPC_8xx_PERF_EVENT
|
|
. = 0x1d00
|
|
InstructionBreakpoint:
|
|
EXCEPTION_PROLOG_0
|
|
lis r10, (instruction_counter - PAGE_OFFSET)@ha
|
|
lwz r11, (instruction_counter - PAGE_OFFSET)@l(r10)
|
|
addi r11, r11, -1
|
|
stw r11, (instruction_counter - PAGE_OFFSET)@l(r10)
|
|
lis r10, 0xffff
|
|
ori r10, r10, 0x01
|
|
mtspr SPRN_COUNTA, r10
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
#else
|
|
EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_EE)
|
|
#endif
|
|
EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_EE)
|
|
|
|
. = 0x2000
|
|
|
|
/*
|
|
* Bottom part of DataStoreTLBMiss handlers for IMMR area and linear RAM.
|
|
* not enough space in the DataStoreTLBMiss area.
|
|
*/
|
|
DTLBMissIMMR:
|
|
mtcr r3
|
|
/* Set 512k byte guarded page and mark it valid */
|
|
li r10, MD_PS512K | MD_GUARDED | MD_SVALID
|
|
MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
|
|
mfspr r10, SPRN_IMMR /* Get current IMMR */
|
|
rlwinm r10, r10, 0, 0xfff80000 /* Get 512 kbytes boundary */
|
|
ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
|
|
_PAGE_PRESENT | _PAGE_NO_CACHE
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
|
|
|
|
li r11, RPN_PATTERN
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
DTLBMissLinear:
|
|
mtcr r3
|
|
/* Set 8M byte page and mark it valid */
|
|
li r11, MD_PS8MEG | MD_SVALID
|
|
MTSPR_CPU6(SPRN_MD_TWC, r11, r3)
|
|
rlwinm r10, r10, 16, 0x0f800000 /* 8xx supports max 256Mb RAM */
|
|
ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
|
|
_PAGE_PRESENT
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
|
|
|
|
li r11, RPN_PATTERN
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
/* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions
|
|
* by decoding the registers used by the dcbx instruction and adding them.
|
|
* DAR is set to the calculated address.
|
|
*/
|
|
/* define if you don't want to use self modifying code */
|
|
#define NO_SELF_MODIFYING_CODE
|
|
FixupDAR:/* Entry point for dcbx workaround. */
|
|
mtspr SPRN_SPRG_SCRATCH2, r10
|
|
/* fetch instruction from memory. */
|
|
mfspr r10, SPRN_SRR0
|
|
IS_KERNEL(r11, r10)
|
|
mfspr r11, SPRN_M_TW /* Get level 1 table */
|
|
BRANCH_UNLESS_KERNEL(3f)
|
|
rlwinm r11, r10, 16, 0xfff8
|
|
_ENTRY(FixupDAR_cmp)
|
|
cmpli cr7, r11, (PAGE_OFFSET + 0x1800000)@h
|
|
/* create physical page address from effective address */
|
|
tophys(r11, r10)
|
|
blt- cr7, 201f
|
|
lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
|
|
/* Insert level 1 index */
|
|
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
|
|
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
|
|
mtcr r11
|
|
bt 28,200f /* bit 28 = Large page (8M) */
|
|
bt 29,202f /* bit 29 = Large page (8M or 512K) */
|
|
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
|
|
/* Insert level 2 index */
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
|
|
201: lwz r11,0(r11)
|
|
/* Check if it really is a dcbx instruction. */
|
|
/* dcbt and dcbtst does not generate DTLB Misses/Errors,
|
|
* no need to include them here */
|
|
xoris r10, r11, 0x7c00 /* check if major OP code is 31 */
|
|
rlwinm r10, r10, 0, 21, 5
|
|
cmpwi cr0, r10, 2028 /* Is dcbz? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 940 /* Is dcbi? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 108 /* Is dcbst? */
|
|
beq+ 144f /* Fix up store bit! */
|
|
cmpwi cr0, r10, 172 /* Is dcbf? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 1964 /* Is icbi? */
|
|
beq+ 142f
|
|
141: mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Nope, go back to normal TLB processing */
|
|
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
200:
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
rlwinm r11, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT_8M - 2), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
|
|
#else
|
|
rlwinm r11, r10, 0, ~HUGEPD_SHIFT_MASK
|
|
#endif
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
|
|
b 201b
|
|
|
|
202:
|
|
rlwinm r11, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT_512K - 2), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_512K, 31
|
|
b 201b
|
|
|
|
144: mfspr r10, SPRN_DSISR
|
|
rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */
|
|
mtspr SPRN_DSISR, r10
|
|
142: /* continue, it was a dcbx, dcbi instruction. */
|
|
#ifndef NO_SELF_MODIFYING_CODE
|
|
andis. r10,r11,0x1f /* test if reg RA is r0 */
|
|
li r10,modified_instr@l
|
|
dcbtst r0,r10 /* touch for store */
|
|
rlwinm r11,r11,0,0,20 /* Zero lower 10 bits */
|
|
oris r11,r11,640 /* Transform instr. to a "add r10,RA,RB" */
|
|
ori r11,r11,532
|
|
stw r11,0(r10) /* store add/and instruction */
|
|
dcbf 0,r10 /* flush new instr. to memory. */
|
|
icbi 0,r10 /* invalidate instr. cache line */
|
|
mfspr r11, SPRN_SPRG_SCRATCH1 /* restore r11 */
|
|
mfspr r10, SPRN_SPRG_SCRATCH0 /* restore r10 */
|
|
isync /* Wait until new instr is loaded from memory */
|
|
modified_instr:
|
|
.space 4 /* this is where the add instr. is stored */
|
|
bne+ 143f
|
|
subf r10,r0,r10 /* r10=r10-r0, only if reg RA is r0 */
|
|
143: mtdar r10 /* store faulting EA in DAR */
|
|
mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Go back to normal TLB handling */
|
|
#else
|
|
mfctr r10
|
|
mtdar r10 /* save ctr reg in DAR */
|
|
rlwinm r10, r11, 24, 24, 28 /* offset into jump table for reg RB */
|
|
addi r10, r10, 150f@l /* add start of table */
|
|
mtctr r10 /* load ctr with jump address */
|
|
xor r10, r10, r10 /* sum starts at zero */
|
|
bctr /* jump into table */
|
|
150:
|
|
add r10, r10, r0 ;b 151f
|
|
add r10, r10, r1 ;b 151f
|
|
add r10, r10, r2 ;b 151f
|
|
add r10, r10, r3 ;b 151f
|
|
add r10, r10, r4 ;b 151f
|
|
add r10, r10, r5 ;b 151f
|
|
add r10, r10, r6 ;b 151f
|
|
add r10, r10, r7 ;b 151f
|
|
add r10, r10, r8 ;b 151f
|
|
add r10, r10, r9 ;b 151f
|
|
mtctr r11 ;b 154f /* r10 needs special handling */
|
|
mtctr r11 ;b 153f /* r11 needs special handling */
|
|
add r10, r10, r12 ;b 151f
|
|
add r10, r10, r13 ;b 151f
|
|
add r10, r10, r14 ;b 151f
|
|
add r10, r10, r15 ;b 151f
|
|
add r10, r10, r16 ;b 151f
|
|
add r10, r10, r17 ;b 151f
|
|
add r10, r10, r18 ;b 151f
|
|
add r10, r10, r19 ;b 151f
|
|
add r10, r10, r20 ;b 151f
|
|
add r10, r10, r21 ;b 151f
|
|
add r10, r10, r22 ;b 151f
|
|
add r10, r10, r23 ;b 151f
|
|
add r10, r10, r24 ;b 151f
|
|
add r10, r10, r25 ;b 151f
|
|
add r10, r10, r26 ;b 151f
|
|
add r10, r10, r27 ;b 151f
|
|
add r10, r10, r28 ;b 151f
|
|
add r10, r10, r29 ;b 151f
|
|
add r10, r10, r30 ;b 151f
|
|
add r10, r10, r31
|
|
151:
|
|
rlwinm. r11,r11,19,24,28 /* offset into jump table for reg RA */
|
|
beq 152f /* if reg RA is zero, don't add it */
|
|
addi r11, r11, 150b@l /* add start of table */
|
|
mtctr r11 /* load ctr with jump address */
|
|
rlwinm r11,r11,0,16,10 /* make sure we don't execute this more than once */
|
|
bctr /* jump into table */
|
|
152:
|
|
mfdar r11
|
|
mtctr r11 /* restore ctr reg from DAR */
|
|
mtdar r10 /* save fault EA to DAR */
|
|
mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Go back to normal TLB handling */
|
|
|
|
/* special handling for r10,r11 since these are modified already */
|
|
153: mfspr r11, SPRN_SPRG_SCRATCH1 /* load r11 from SPRN_SPRG_SCRATCH1 */
|
|
add r10, r10, r11 /* add it */
|
|
mfctr r11 /* restore r11 */
|
|
b 151b
|
|
154: mfspr r11, SPRN_SPRG_SCRATCH0 /* load r10 from SPRN_SPRG_SCRATCH0 */
|
|
add r10, r10, r11 /* add it */
|
|
mfctr r11 /* restore r11 */
|
|
b 151b
|
|
#endif
|
|
|
|
/*
|
|
* This is where the main kernel code starts.
|
|
*/
|
|
start_here:
|
|
/* ptr to current */
|
|
lis r2,init_task@h
|
|
ori r2,r2,init_task@l
|
|
|
|
/* ptr to phys current thread */
|
|
tophys(r4,r2)
|
|
addi r4,r4,THREAD /* init task's THREAD */
|
|
mtspr SPRN_SPRG_THREAD,r4
|
|
|
|
/* stack */
|
|
lis r1,init_thread_union@ha
|
|
addi r1,r1,init_thread_union@l
|
|
li r0,0
|
|
stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
|
|
|
|
bl early_init /* We have to do this with MMU on */
|
|
|
|
/*
|
|
* Decide what sort of machine this is and initialize the MMU.
|
|
*/
|
|
li r3,0
|
|
mr r4,r31
|
|
bl machine_init
|
|
bl MMU_init
|
|
|
|
/*
|
|
* Go back to running unmapped so we can load up new values
|
|
* and change to using our exception vectors.
|
|
* On the 8xx, all we have to do is invalidate the TLB to clear
|
|
* the old 8M byte TLB mappings and load the page table base register.
|
|
*/
|
|
/* The right way to do this would be to track it down through
|
|
* init's THREAD like the context switch code does, but this is
|
|
* easier......until someone changes init's static structures.
|
|
*/
|
|
lis r6, swapper_pg_dir@ha
|
|
tophys(r6,r6)
|
|
#ifdef CONFIG_8xx_CPU6
|
|
lis r4, cpu6_errata_word@h
|
|
ori r4, r4, cpu6_errata_word@l
|
|
li r3, 0x3f80
|
|
stw r3, 12(r4)
|
|
lwz r3, 12(r4)
|
|
#endif
|
|
mtspr SPRN_M_TW, r6
|
|
lis r4,2f@h
|
|
ori r4,r4,2f@l
|
|
tophys(r4,r4)
|
|
li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
|
|
mtspr SPRN_SRR0,r4
|
|
mtspr SPRN_SRR1,r3
|
|
rfi
|
|
/* Load up the kernel context */
|
|
2:
|
|
SYNC /* Force all PTE updates to finish */
|
|
tlbia /* Clear all TLB entries */
|
|
sync /* wait for tlbia/tlbie to finish */
|
|
TLBSYNC /* ... on all CPUs */
|
|
|
|
/* set up the PTE pointers for the Abatron bdiGDB.
|
|
*/
|
|
tovirt(r6,r6)
|
|
lis r5, abatron_pteptrs@h
|
|
ori r5, r5, abatron_pteptrs@l
|
|
stw r5, 0xf0(r0) /* Must match your Abatron config file */
|
|
tophys(r5,r5)
|
|
stw r6, 0(r5)
|
|
|
|
/* Now turn on the MMU for real! */
|
|
li r4,MSR_KERNEL
|
|
lis r3,start_kernel@h
|
|
ori r3,r3,start_kernel@l
|
|
mtspr SPRN_SRR0,r3
|
|
mtspr SPRN_SRR1,r4
|
|
rfi /* enable MMU and jump to start_kernel */
|
|
|
|
/* Set up the initial MMU state so we can do the first level of
|
|
* kernel initialization. This maps the first 8 MBytes of memory 1:1
|
|
* virtual to physical. Also, set the cache mode since that is defined
|
|
* by TLB entries and perform any additional mapping (like of the IMMR).
|
|
* If configured to pin some TLBs, we pin the first 8 Mbytes of kernel,
|
|
* 24 Mbytes of data, and the 512k IMMR space. Anything not covered by
|
|
* these mappings is mapped by page tables.
|
|
*/
|
|
initial_mmu:
|
|
li r8, 0
|
|
mtspr SPRN_MI_CTR, r8 /* remove PINNED ITLB entries */
|
|
lis r10, MD_RESETVAL@h
|
|
#ifndef CONFIG_8xx_COPYBACK
|
|
oris r10, r10, MD_WTDEF@h
|
|
#endif
|
|
mtspr SPRN_MD_CTR, r10 /* remove PINNED DTLB entries */
|
|
|
|
tlbia /* Invalidate all TLB entries */
|
|
/* Always pin the first 8 MB ITLB to prevent ITLB
|
|
misses while mucking around with SRR0/SRR1 in asm
|
|
*/
|
|
lis r8, MI_RSV4I@h
|
|
ori r8, r8, 0x1c00
|
|
|
|
mtspr SPRN_MI_CTR, r8 /* Set instruction MMU control */
|
|
|
|
#ifdef CONFIG_PIN_TLB
|
|
oris r10, r10, MD_RSV4I@h
|
|
mtspr SPRN_MD_CTR, r10 /* Set data TLB control */
|
|
#endif
|
|
|
|
/* Now map the lower 8 Meg into the ITLB. */
|
|
lis r8, KERNELBASE@h /* Create vaddr for TLB */
|
|
ori r8, r8, MI_EVALID /* Mark it valid */
|
|
mtspr SPRN_MI_EPN, r8
|
|
li r8, MI_PS8MEG | (2 << 5) /* Set 8M byte page, APG 2 */
|
|
ori r8, r8, MI_SVALID /* Make it valid */
|
|
mtspr SPRN_MI_TWC, r8
|
|
li r8, MI_BOOTINIT /* Create RPN for address 0 */
|
|
mtspr SPRN_MI_RPN, r8 /* Store TLB entry */
|
|
|
|
lis r8, MI_APG_INIT@h /* Set protection modes */
|
|
ori r8, r8, MI_APG_INIT@l
|
|
mtspr SPRN_MI_AP, r8
|
|
lis r8, MD_APG_INIT@h
|
|
ori r8, r8, MD_APG_INIT@l
|
|
mtspr SPRN_MD_AP, r8
|
|
|
|
/* Map a 512k page for the IMMR to get the processor
|
|
* internal registers (among other things).
|
|
*/
|
|
#ifdef CONFIG_PIN_TLB_IMMR
|
|
ori r10, r10, 0x1c00
|
|
mtspr SPRN_MD_CTR, r10
|
|
|
|
mfspr r9, 638 /* Get current IMMR */
|
|
andis. r9, r9, 0xfff8 /* Get 512 kbytes boundary */
|
|
|
|
lis r8, VIRT_IMMR_BASE@h /* Create vaddr for TLB */
|
|
ori r8, r8, MD_EVALID /* Mark it valid */
|
|
mtspr SPRN_MD_EPN, r8
|
|
li r8, MD_PS512K | MD_GUARDED /* Set 512k byte page */
|
|
ori r8, r8, MD_SVALID /* Make it valid */
|
|
mtspr SPRN_MD_TWC, r8
|
|
mr r8, r9 /* Create paddr for TLB */
|
|
ori r8, r8, MI_BOOTINIT|0x2 /* Inhibit cache -- Cort */
|
|
mtspr SPRN_MD_RPN, r8
|
|
#endif
|
|
|
|
/* Since the cache is enabled according to the information we
|
|
* just loaded into the TLB, invalidate and enable the caches here.
|
|
* We should probably check/set other modes....later.
|
|
*/
|
|
lis r8, IDC_INVALL@h
|
|
mtspr SPRN_IC_CST, r8
|
|
mtspr SPRN_DC_CST, r8
|
|
lis r8, IDC_ENABLE@h
|
|
mtspr SPRN_IC_CST, r8
|
|
#ifdef CONFIG_8xx_COPYBACK
|
|
mtspr SPRN_DC_CST, r8
|
|
#else
|
|
/* For a debug option, I left this here to easily enable
|
|
* the write through cache mode
|
|
*/
|
|
lis r8, DC_SFWT@h
|
|
mtspr SPRN_DC_CST, r8
|
|
lis r8, IDC_ENABLE@h
|
|
mtspr SPRN_DC_CST, r8
|
|
#endif
|
|
/* Disable debug mode entry on breakpoints */
|
|
mfspr r8, SPRN_DER
|
|
#ifdef CONFIG_PPC_8xx_PERF_EVENT
|
|
rlwinm r8, r8, 0, ~0xc
|
|
#else
|
|
rlwinm r8, r8, 0, ~0x8
|
|
#endif
|
|
mtspr SPRN_DER, r8
|
|
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
|
|
.globl sdata
|
|
sdata:
|
|
.globl empty_zero_page
|
|
.align PAGE_SHIFT
|
|
empty_zero_page:
|
|
.space PAGE_SIZE
|
|
EXPORT_SYMBOL(empty_zero_page)
|
|
|
|
.globl swapper_pg_dir
|
|
swapper_pg_dir:
|
|
.space PGD_TABLE_SIZE
|
|
|
|
/* Room for two PTE table poiners, usually the kernel and current user
|
|
* pointer to their respective root page table (pgdir).
|
|
*/
|
|
abatron_pteptrs:
|
|
.space 8
|
|
|
|
#ifdef CONFIG_8xx_CPU6
|
|
.globl cpu6_errata_word
|
|
cpu6_errata_word:
|
|
.space 16
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_8xx_PERF_EVENT
|
|
.globl itlb_miss_counter
|
|
itlb_miss_counter:
|
|
.space 4
|
|
|
|
.globl dtlb_miss_counter
|
|
dtlb_miss_counter:
|
|
.space 4
|
|
|
|
.globl instruction_counter
|
|
instruction_counter:
|
|
.space 4
|
|
#endif
|