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-/*
- * PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
- * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
- * Adapted for Power Macintosh by Paul Mackerras.
- * Low-level exception handlers and MMU support
- * rewritten by Paul Mackerras.
- * Copyright (C) 1996 Paul Mackerras.
- * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
- * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
- *
- * This file contains the low-level support and setup for the
- * PowerPC platform, including trap and interrupt dispatch.
- * (The PPC 8xx embedded CPUs use head_8xx.S instead.)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- */
-
-#include <asm/processor.h>
-#include <asm/page.h>
-#include <asm/mmu.h>
-#include <asm/pgtable.h>
-#include <asm/cputable.h>
-#include <asm/cache.h>
-#include <asm/thread_info.h>
-#include <asm/ppc_asm.h>
-#include <asm/asm-offsets.h>
-
-/* 601 only have IBAT; cr0.eq is set on 601 when using this macro */
-#define LOAD_BAT(n, reg, RA, RB) \
- /* see the comment for clear_bats() -- Cort */ \
- li RA,0; \
- mtspr SPRN_IBAT##n##U,RA; \
- mtspr SPRN_DBAT##n##U,RA; \
- lwz RA,(n*16)+0(reg); \
- lwz RB,(n*16)+4(reg); \
- mtspr SPRN_IBAT##n##U,RA; \
- mtspr SPRN_IBAT##n##L,RB; \
- beq 1f; \
- lwz RA,(n*16)+8(reg); \
- lwz RB,(n*16)+12(reg); \
- mtspr SPRN_DBAT##n##U,RA; \
- mtspr SPRN_DBAT##n##L,RB; \
-1:
-
- .text
- .stabs "arch/ppc/kernel/",N_SO,0,0,0f
- .stabs "head.S",N_SO,0,0,0f
-0:
- .globl _stext
-_stext:
-
-/*
- * _start is defined this way because the XCOFF loader in the OpenFirmware
- * on the powermac expects the entry point to be a procedure descriptor.
- */
- .text
- .globl _start
-_start:
- /*
- * These are here for legacy reasons, the kernel used to
- * need to look like a coff function entry for the pmac
- * but we're always started by some kind of bootloader now.
- * -- Cort
- */
- nop /* used by __secondary_hold on prep (mtx) and chrp smp */
- nop /* used by __secondary_hold on prep (mtx) and chrp smp */
- nop
-
-/* PMAC
- * Enter here with the kernel text, data and bss loaded starting at
- * 0, running with virtual == physical mapping.
- * r5 points to the prom entry point (the client interface handler
- * address). Address translation is turned on, with the prom
- * managing the hash table. Interrupts are disabled. The stack
- * pointer (r1) points to just below the end of the half-meg region
- * from 0x380000 - 0x400000, which is mapped in already.
- *
- * If we are booted from MacOS via BootX, we enter with the kernel
- * image loaded somewhere, and the following values in registers:
- * r3: 'BooX' (0x426f6f58)
- * r4: virtual address of boot_infos_t
- * r5: 0
- *
- * APUS
- * r3: 'APUS'
- * r4: physical address of memory base
- * Linux/m68k style BootInfo structure at &_end.
- *
- * PREP
- * This is jumped to on prep systems right after the kernel is relocated
- * to its proper place in memory by the boot loader. The expected layout
- * of the regs is:
- * r3: ptr to residual data
- * r4: initrd_start or if no initrd then 0
- * r5: initrd_end - unused if r4 is 0
- * r6: Start of command line string
- * r7: End of command line string
- *
- * This just gets a minimal mmu environment setup so we can call
- * start_here() to do the real work.
- * -- Cort
- */
-
- .globl __start
-__start:
- mr r31,r3 /* save parameters */
- mr r30,r4
- mr r29,r5
- mr r28,r6
- mr r27,r7
- li r24,0 /* cpu # */
-
-/*
- * early_init() does the early machine identification and does
- * the necessary low-level setup and clears the BSS
- * -- Cort <cort@fsmlabs.com>
- */
- bl early_init
-
-/* Switch MMU off, clear BATs and flush TLB. At this point, r3 contains
- * the physical address we are running at, returned by early_init()
- */
- bl mmu_off
-__after_mmu_off:
- bl clear_bats
- bl flush_tlbs
-
- bl initial_bats
-#ifdef CONFIG_BOOTX_TEXT
- bl setup_disp_bat
-#endif
-
-/*
- * Call setup_cpu for CPU 0 and initialize 6xx Idle
- */
- bl reloc_offset
- li r24,0 /* cpu# */
- bl call_setup_cpu /* Call setup_cpu for this CPU */
-#ifdef CONFIG_6xx
- bl reloc_offset
- bl init_idle_6xx
-#endif /* CONFIG_6xx */
-
-
-/*
- * We need to run with _start at physical address 0.
- * If the MMU is already turned on, we copy stuff to KERNELBASE,
- * otherwise we copy it to 0.
- */
- bl reloc_offset
- mr r26,r3
- addis r4,r3,KERNELBASE@h /* current address of _start */
- cmpwi 0,r4,0 /* are we already running at 0? */
- bne relocate_kernel
-
-/*
- * we now have the 1st 16M of ram mapped with the bats.
- * prep needs the mmu to be turned on here, but pmac already has it on.
- * this shouldn't bother the pmac since it just gets turned on again
- * as we jump to our code at KERNELBASE. -- Cort
- * Actually no, pmac doesn't have it on any more. BootX enters with MMU
- * off, and in other cases, we now turn it off before changing BATs above.
- */
-turn_on_mmu:
- mfmsr r0
- ori r0,r0,MSR_DR|MSR_IR
- mtspr SPRN_SRR1,r0
- lis r0,start_here@h
- ori r0,r0,start_here@l
- mtspr SPRN_SRR0,r0
- SYNC
- RFI /* enables MMU */
-
-/*
- * We need __secondary_hold as a place to hold the other cpus on
- * an SMP machine, even when we are running a UP kernel.
- */
- . = 0xc0 /* for prep bootloader */
- li r3,1 /* MTX only has 1 cpu */
- .globl __secondary_hold
-__secondary_hold:
- /* tell the master we're here */
- stw r3,4(0)
-#ifdef CONFIG_SMP
-100: lwz r4,0(0)
- /* wait until we're told to start */
- cmpw 0,r4,r3
- bne 100b
- /* our cpu # was at addr 0 - go */
- mr r24,r3 /* cpu # */
- b __secondary_start
-#else
- b .
-#endif /* CONFIG_SMP */
-
-/*
- * Exception entry code. This code runs with address translation
- * turned off, i.e. using physical addresses.
- * We assume sprg3 has the physical address of the current
- * task's thread_struct.
- */
-#define EXCEPTION_PROLOG \
- mtspr SPRN_SPRG0,r10; \
- mtspr SPRN_SPRG1,r11; \
- mfcr r10; \
- EXCEPTION_PROLOG_1; \
- EXCEPTION_PROLOG_2
-
-#define EXCEPTION_PROLOG_1 \
- mfspr r11,SPRN_SRR1; /* check whether user or kernel */ \
- andi. r11,r11,MSR_PR; \
- tophys(r11,r1); /* use tophys(r1) if kernel */ \
- beq 1f; \
- mfspr r11,SPRN_SPRG3; \
- lwz r11,THREAD_INFO-THREAD(r11); \
- addi r11,r11,THREAD_SIZE; \
- tophys(r11,r11); \
-1: subi r11,r11,INT_FRAME_SIZE /* alloc exc. frame */
-
-
-#define EXCEPTION_PROLOG_2 \
- CLR_TOP32(r11); \
- stw r10,_CCR(r11); /* save registers */ \
- stw r12,GPR12(r11); \
- stw r9,GPR9(r11); \
- mfspr r10,SPRN_SPRG0; \
- stw r10,GPR10(r11); \
- mfspr r12,SPRN_SPRG1; \
- stw r12,GPR11(r11); \
- mflr r10; \
- stw r10,_LINK(r11); \
- mfspr r12,SPRN_SRR0; \
- mfspr r9,SPRN_SRR1; \
- stw r1,GPR1(r11); \
- stw r1,0(r11); \
- tovirt(r1,r11); /* set new kernel sp */ \
- li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR); /* can take exceptions */ \
- MTMSRD(r10); /* (except for mach check in rtas) */ \
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
-
-/*
- * Note: code which follows this uses cr0.eq (set if from kernel),
- * r11, r12 (SRR0), and r9 (SRR1).
- *
- * Note2: once we have set r1 we are in a position to take exceptions
- * again, and we could thus set MSR:RI at that point.
- */
-
-/*
- * Exception vectors.
- */
-#define EXCEPTION(n, label, hdlr, xfer) \
- . = n; \
-label: \
- EXCEPTION_PROLOG; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- xfer(n, hdlr)
-
-#define EXC_XFER_TEMPLATE(n, hdlr, trap, copyee, tfer, ret) \
- li r10,trap; \
- stw r10,TRAP(r11); \
- li r10,MSR_KERNEL; \
- copyee(r10, r9); \
- bl tfer; \
-i##n: \
- .long hdlr; \
- .long ret
-
-#define COPY_EE(d, s) rlwimi d,s,0,16,16
-#define NOCOPY(d, s)
-
-#define EXC_XFER_STD(n, hdlr) \
- EXC_XFER_TEMPLATE(n, hdlr, n, NOCOPY, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(n, hdlr, n+1, NOCOPY, transfer_to_handler, \
- ret_from_except)
-
-#define EXC_XFER_EE(n, hdlr) \
- EXC_XFER_TEMPLATE(n, hdlr, n, COPY_EE, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_EE_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(n, hdlr, n+1, COPY_EE, transfer_to_handler, \
- ret_from_except)
-
-/* System reset */
-/* core99 pmac starts the seconary here by changing the vector, and
- putting it back to what it was (unknown_exception) when done. */
- EXCEPTION(0x100, Reset, unknown_exception, EXC_XFER_STD)
-
-/* Machine check */
- . = 0x200
- mtspr SPRN_SPRG0,r10
- mtspr SPRN_SPRG1,r11
- mfcr r10
- EXCEPTION_PROLOG_1
-7: EXCEPTION_PROLOG_2
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_STD(0x200, machine_check_exception)
-
-/* Data access exception. */
- . = 0x300
-DataAccess:
- EXCEPTION_PROLOG
- mfspr r10,SPRN_DSISR
- andis. r0,r10,0xa470 /* weird error? */
- bne 1f /* if not, try to put a PTE */
- mfspr r4,SPRN_DAR /* into the hash table */
- rlwinm r3,r10,32-15,21,21 /* DSISR_STORE -> _PAGE_RW */
- bl hash_page
-1: stw r10,_DSISR(r11)
- mr r5,r10
- mfspr r4,SPRN_DAR
- EXC_XFER_EE_LITE(0x300, handle_page_fault)
-
-/* Instruction access exception. */
- . = 0x400
-InstructionAccess:
- EXCEPTION_PROLOG
- andis. r0,r9,0x4000 /* no pte found? */
- beq 1f /* if so, try to put a PTE */
- li r3,0 /* into the hash table */
- mr r4,r12 /* SRR0 is fault address */
- bl hash_page
-1: mr r4,r12
- mr r5,r9
- EXC_XFER_EE_LITE(0x400, handle_page_fault)
-
-/* External interrupt */
- EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
-
-/* Alignment exception */
- . = 0x600
-Alignment:
- EXCEPTION_PROLOG
- mfspr r4,SPRN_DAR
- stw r4,_DAR(r11)
- mfspr r5,SPRN_DSISR
- stw r5,_DSISR(r11)
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_EE(0x600, alignment_exception)
-
-/* Program check exception */
- EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
-
-/* Floating-point unavailable */
- . = 0x800
-FPUnavailable:
- EXCEPTION_PROLOG
- bne load_up_fpu /* if from user, just load it up */
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
-
-/* Decrementer */
- EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
-
- EXCEPTION(0xa00, Trap_0a, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_EE)
-
-/* System call */
- . = 0xc00
-SystemCall:
- EXCEPTION_PROLOG
- EXC_XFER_EE_LITE(0xc00, DoSyscall)
-
-/* Single step - not used on 601 */
- EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
- EXCEPTION(0xe00, Trap_0e, unknown_exception, EXC_XFER_EE)
-
-/*
- * The Altivec unavailable trap is at 0x0f20. Foo.
- * We effectively remap it to 0x3000.
- * We include an altivec unavailable exception vector even if
- * not configured for Altivec, so that you can't panic a
- * non-altivec kernel running on a machine with altivec just
- * by executing an altivec instruction.
- */
- . = 0xf00
- b Trap_0f
-
- . = 0xf20
- b AltiVecUnavailable
-
-Trap_0f:
- EXCEPTION_PROLOG
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_EE(0xf00, unknown_exception)
-
-/*
- * Handle TLB miss for instruction on 603/603e.
- * Note: we get an alternate set of r0 - r3 to use automatically.
- */
- . = 0x1000
-InstructionTLBMiss:
-/*
- * r0: stored ctr
- * r1: linux style pte ( later becomes ppc hardware pte )
- * r2: ptr to linux-style pte
- * r3: scratch
- */
- mfctr r0
- /* Get PTE (linux-style) and check access */
- mfspr r3,SPRN_IMISS
- lis r1,KERNELBASE@h /* check if kernel address */
- cmplw 0,r3,r1
- mfspr r2,SPRN_SPRG3
- li r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
- lwz r2,PGDIR(r2)
- blt+ 112f
- lis r2,swapper_pg_dir@ha /* if kernel address, use */
- addi r2,r2,swapper_pg_dir@l /* kernel page table */
- mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
- rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
-112: tophys(r2,r2)
- rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
- lwz r2,0(r2) /* get pmd entry */
- rlwinm. r2,r2,0,0,19 /* extract address of pte page */
- beq- InstructionAddressInvalid /* return if no mapping */
- rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */
- lwz r3,0(r2) /* get linux-style pte */
- andc. r1,r1,r3 /* check access & ~permission */
- bne- InstructionAddressInvalid /* return if access not permitted */
- ori r3,r3,_PAGE_ACCESSED /* set _PAGE_ACCESSED in pte */
- /*
- * NOTE! We are assuming this is not an SMP system, otherwise
- * we would need to update the pte atomically with lwarx/stwcx.
- */
- stw r3,0(r2) /* update PTE (accessed bit) */
- /* Convert linux-style PTE to low word of PPC-style PTE */
- rlwinm r1,r3,32-10,31,31 /* _PAGE_RW -> PP lsb */
- rlwinm r2,r3,32-7,31,31 /* _PAGE_DIRTY -> PP lsb */
- and r1,r1,r2 /* writable if _RW and _DIRTY */
- rlwimi r3,r3,32-1,30,30 /* _PAGE_USER -> PP msb */
- rlwimi r3,r3,32-1,31,31 /* _PAGE_USER -> PP lsb */
- ori r1,r1,0xe14 /* clear out reserved bits and M */
- andc r1,r3,r1 /* PP = user? (rw&dirty? 2: 3): 0 */
- mtspr SPRN_RPA,r1
- mfspr r3,SPRN_IMISS
- tlbli r3
- mfspr r3,SPRN_SRR1 /* Need to restore CR0 */
- mtcrf 0x80,r3
- rfi
-InstructionAddressInvalid:
- mfspr r3,SPRN_SRR1
- rlwinm r1,r3,9,6,6 /* Get load/store bit */
-
- addis r1,r1,0x2000
- mtspr SPRN_DSISR,r1 /* (shouldn't be needed) */
- mtctr r0 /* Restore CTR */
- andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */
- or r2,r2,r1
- mtspr SPRN_SRR1,r2
- mfspr r1,SPRN_IMISS /* Get failing address */
- rlwinm. r2,r2,0,31,31 /* Check for little endian access */
- rlwimi r2,r2,1,30,30 /* change 1 -> 3 */
- xor r1,r1,r2
- mtspr SPRN_DAR,r1 /* Set fault address */
- mfmsr r0 /* Restore "normal" registers */
- xoris r0,r0,MSR_TGPR>>16
- mtcrf 0x80,r3 /* Restore CR0 */
- mtmsr r0
- b InstructionAccess
-
-/*
- * Handle TLB miss for DATA Load operation on 603/603e
- */
- . = 0x1100
-DataLoadTLBMiss:
-/*
- * r0: stored ctr
- * r1: linux style pte ( later becomes ppc hardware pte )
- * r2: ptr to linux-style pte
- * r3: scratch
- */
- mfctr r0
- /* Get PTE (linux-style) and check access */
- mfspr r3,SPRN_DMISS
- lis r1,KERNELBASE@h /* check if kernel address */
- cmplw 0,r3,r1
- mfspr r2,SPRN_SPRG3
- li r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
- lwz r2,PGDIR(r2)
- blt+ 112f
- lis r2,swapper_pg_dir@ha /* if kernel address, use */
- addi r2,r2,swapper_pg_dir@l /* kernel page table */
- mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
- rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
-112: tophys(r2,r2)
- rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
- lwz r2,0(r2) /* get pmd entry */
- rlwinm. r2,r2,0,0,19 /* extract address of pte page */
- beq- DataAddressInvalid /* return if no mapping */
- rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */
- lwz r3,0(r2) /* get linux-style pte */
- andc. r1,r1,r3 /* check access & ~permission */
- bne- DataAddressInvalid /* return if access not permitted */
- ori r3,r3,_PAGE_ACCESSED /* set _PAGE_ACCESSED in pte */
- /*
- * NOTE! We are assuming this is not an SMP system, otherwise
- * we would need to update the pte atomically with lwarx/stwcx.
- */
- stw r3,0(r2) /* update PTE (accessed bit) */
- /* Convert linux-style PTE to low word of PPC-style PTE */
- rlwinm r1,r3,32-10,31,31 /* _PAGE_RW -> PP lsb */
- rlwinm r2,r3,32-7,31,31 /* _PAGE_DIRTY -> PP lsb */
- and r1,r1,r2 /* writable if _RW and _DIRTY */
- rlwimi r3,r3,32-1,30,30 /* _PAGE_USER -> PP msb */
- rlwimi r3,r3,32-1,31,31 /* _PAGE_USER -> PP lsb */
- ori r1,r1,0xe14 /* clear out reserved bits and M */
- andc r1,r3,r1 /* PP = user? (rw&dirty? 2: 3): 0 */
- mtspr SPRN_RPA,r1
- mfspr r3,SPRN_DMISS
- tlbld r3
- mfspr r3,SPRN_SRR1 /* Need to restore CR0 */
- mtcrf 0x80,r3
- rfi
-DataAddressInvalid:
- mfspr r3,SPRN_SRR1
- rlwinm r1,r3,9,6,6 /* Get load/store bit */
- addis r1,r1,0x2000
- mtspr SPRN_DSISR,r1
- mtctr r0 /* Restore CTR */
- andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */
- mtspr SPRN_SRR1,r2
- mfspr r1,SPRN_DMISS /* Get failing address */
- rlwinm. r2,r2,0,31,31 /* Check for little endian access */
- beq 20f /* Jump if big endian */
- xori r1,r1,3
-20: mtspr SPRN_DAR,r1 /* Set fault address */
- mfmsr r0 /* Restore "normal" registers */
- xoris r0,r0,MSR_TGPR>>16
- mtcrf 0x80,r3 /* Restore CR0 */
- mtmsr r0
- b DataAccess
-
-/*
- * Handle TLB miss for DATA Store on 603/603e
- */
- . = 0x1200
-DataStoreTLBMiss:
-/*
- * r0: stored ctr
- * r1: linux style pte ( later becomes ppc hardware pte )
- * r2: ptr to linux-style pte
- * r3: scratch
- */
- mfctr r0
- /* Get PTE (linux-style) and check access */
- mfspr r3,SPRN_DMISS
- lis r1,KERNELBASE@h /* check if kernel address */
- cmplw 0,r3,r1
- mfspr r2,SPRN_SPRG3
- li r1,_PAGE_RW|_PAGE_USER|_PAGE_PRESENT /* access flags */
- lwz r2,PGDIR(r2)
- blt+ 112f
- lis r2,swapper_pg_dir@ha /* if kernel address, use */
- addi r2,r2,swapper_pg_dir@l /* kernel page table */
- mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
- rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
-112: tophys(r2,r2)
- rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
- lwz r2,0(r2) /* get pmd entry */
- rlwinm. r2,r2,0,0,19 /* extract address of pte page */
- beq- DataAddressInvalid /* return if no mapping */
- rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */
- lwz r3,0(r2) /* get linux-style pte */
- andc. r1,r1,r3 /* check access & ~permission */
- bne- DataAddressInvalid /* return if access not permitted */
- ori r3,r3,_PAGE_ACCESSED|_PAGE_DIRTY
- /*
- * NOTE! We are assuming this is not an SMP system, otherwise
- * we would need to update the pte atomically with lwarx/stwcx.
- */
- stw r3,0(r2) /* update PTE (accessed/dirty bits) */
- /* Convert linux-style PTE to low word of PPC-style PTE */
- rlwimi r3,r3,32-1,30,30 /* _PAGE_USER -> PP msb */
- li r1,0xe15 /* clear out reserved bits and M */
- andc r1,r3,r1 /* PP = user? 2: 0 */
- mtspr SPRN_RPA,r1
- mfspr r3,SPRN_DMISS
- tlbld r3
- mfspr r3,SPRN_SRR1 /* Need to restore CR0 */
- mtcrf 0x80,r3
- rfi
-
-#ifndef CONFIG_ALTIVEC
-#define altivec_assist_exception unknown_exception
-#endif
-
- EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception, EXC_XFER_EE)
- EXCEPTION(0x1400, SMI, SMIException, EXC_XFER_EE)
- EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x1600, Trap_16, altivec_assist_exception, EXC_XFER_EE)
- EXCEPTION(0x1700, Trap_17, TAUException, EXC_XFER_STD)
- 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)
- EXCEPTION(0x1c00, Trap_1c, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2000, RunMode, RunModeException, EXC_XFER_EE)
- EXCEPTION(0x2100, Trap_21, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2200, Trap_22, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2300, Trap_23, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2400, Trap_24, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2500, Trap_25, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2600, Trap_26, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2700, Trap_27, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2800, Trap_28, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2900, Trap_29, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2a00, Trap_2a, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2b00, Trap_2b, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2c00, Trap_2c, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2d00, Trap_2d, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2e00, Trap_2e, unknown_exception, EXC_XFER_EE)
- EXCEPTION(0x2f00, MOLTrampoline, unknown_exception, EXC_XFER_EE_LITE)
-
- .globl mol_trampoline
- .set mol_trampoline, i0x2f00
-
- . = 0x3000
-
-AltiVecUnavailable:
- EXCEPTION_PROLOG
-#ifdef CONFIG_ALTIVEC
- bne load_up_altivec /* if from user, just load it up */
-#endif /* CONFIG_ALTIVEC */
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_EE_LITE(0xf20, altivec_unavailable_exception)
-
-#ifdef CONFIG_ALTIVEC
-/* Note that the AltiVec support is closely modeled after the FP
- * support. Changes to one are likely to be applicable to the
- * other! */
-load_up_altivec:
-/*
- * Disable AltiVec for the task which had AltiVec previously,
- * and save its AltiVec registers in its thread_struct.
- * Enables AltiVec for use in the kernel on return.
- * On SMP we know the AltiVec units are free, since we give it up every
- * switch. -- Kumar
- */
- mfmsr r5
- oris r5,r5,MSR_VEC@h
- MTMSRD(r5) /* enable use of AltiVec now */
- isync
-/*
- * For SMP, we don't do lazy AltiVec switching because it just gets too
- * horrendously complex, especially when a task switches from one CPU
- * to another. Instead we call giveup_altivec in switch_to.
- */
-#ifndef CONFIG_SMP
- tophys(r6,0)
- addis r3,r6,last_task_used_altivec@ha
- lwz r4,last_task_used_altivec@l(r3)
- cmpwi 0,r4,0
- beq 1f
- add r4,r4,r6
- addi r4,r4,THREAD /* want THREAD of last_task_used_altivec */
- SAVE_32VRS(0,r10,r4)
- mfvscr vr0
- li r10,THREAD_VSCR
- stvx vr0,r10,r4
- lwz r5,PT_REGS(r4)
- add r5,r5,r6
- lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- lis r10,MSR_VEC@h
- andc r4,r4,r10 /* disable altivec for previous task */
- stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* CONFIG_SMP */
- /* enable use of AltiVec after return */
- oris r9,r9,MSR_VEC@h
- mfspr r5,SPRN_SPRG3 /* current task's THREAD (phys) */
- li r4,1
- li r10,THREAD_VSCR
- stw r4,THREAD_USED_VR(r5)
- lvx vr0,r10,r5
- mtvscr vr0
- REST_32VRS(0,r10,r5)
-#ifndef CONFIG_SMP
- subi r4,r5,THREAD
- sub r4,r4,r6
- stw r4,last_task_used_altivec@l(r3)
-#endif /* CONFIG_SMP */
- /* restore registers and return */
- /* we haven't used ctr or xer or lr */
- b fast_exception_return
-
-/*
- * giveup_altivec(tsk)
- * Disable AltiVec for the task given as the argument,
- * and save the AltiVec registers in its thread_struct.
- * Enables AltiVec for use in the kernel on return.
- */
-
- .globl giveup_altivec
-giveup_altivec:
- mfmsr r5
- oris r5,r5,MSR_VEC@h
- SYNC
- MTMSRD(r5) /* enable use of AltiVec now */
- isync
- cmpwi 0,r3,0
- beqlr- /* if no previous owner, done */
- addi r3,r3,THREAD /* want THREAD of task */
- lwz r5,PT_REGS(r3)
- cmpwi 0,r5,0
- SAVE_32VRS(0, r4, r3)
- mfvscr vr0
- li r4,THREAD_VSCR
- stvx vr0,r4,r3
- beq 1f
- lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- lis r3,MSR_VEC@h
- andc r4,r4,r3 /* disable AltiVec for previous task */
- stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#ifndef CONFIG_SMP
- li r5,0
- lis r4,last_task_used_altivec@ha
- stw r5,last_task_used_altivec@l(r4)
-#endif /* CONFIG_SMP */
- blr
-#endif /* CONFIG_ALTIVEC */
-
-/*
- * This code is jumped to from the startup code to copy
- * the kernel image to physical address 0.
- */
-relocate_kernel:
- addis r9,r26,klimit@ha /* fetch klimit */
- lwz r25,klimit@l(r9)
- addis r25,r25,-KERNELBASE@h
- li r3,0 /* Destination base address */
- li r6,0 /* Destination offset */
- li r5,0x4000 /* # bytes of memory to copy */
- bl copy_and_flush /* copy the first 0x4000 bytes */
- addi r0,r3,4f@l /* jump to the address of 4f */
- mtctr r0 /* in copy and do the rest. */
- bctr /* jump to the copy */
-4: mr r5,r25
- bl copy_and_flush /* copy the rest */
- b turn_on_mmu
-
-/*
- * Copy routine used to copy the kernel to start at physical address 0
- * and flush and invalidate the caches as needed.
- * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
- * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
- */
-copy_and_flush:
- addi r5,r5,-4
- addi r6,r6,-4
-4: li r0,L1_CACHE_BYTES/4
- mtctr r0
-3: addi r6,r6,4 /* copy a cache line */
- lwzx r0,r6,r4
- stwx r0,r6,r3
- bdnz 3b
- dcbst r6,r3 /* write it to memory */
- sync
- icbi r6,r3 /* flush the icache line */
- cmplw 0,r6,r5
- blt 4b
- sync /* additional sync needed on g4 */
- isync
- addi r5,r5,4
- addi r6,r6,4
- blr
-
-#ifdef CONFIG_SMP
- .globl __secondary_start_pmac_0
-__secondary_start_pmac_0:
- /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
- li r24,0
- b 1f
- li r24,1
- b 1f
- li r24,2
- b 1f
- li r24,3
-1:
- /* on powersurge, we come in here with IR=0 and DR=1, and DBAT 0
- set to map the 0xf0000000 - 0xffffffff region */
- mfmsr r0
- rlwinm r0,r0,0,28,26 /* clear DR (0x10) */
- SYNC
- mtmsr r0
- isync
-
- .globl __secondary_start
-__secondary_start:
- /* Copy some CPU settings from CPU 0 */
- bl __restore_cpu_setup
-
- lis r3,-KERNELBASE@h
- mr r4,r24
- bl call_setup_cpu /* Call setup_cpu for this CPU */
-#ifdef CONFIG_6xx
- lis r3,-KERNELBASE@h
- bl init_idle_6xx
-#endif /* CONFIG_6xx */
-
- /* get current_thread_info and current */
- lis r1,secondary_ti@ha
- tophys(r1,r1)
- lwz r1,secondary_ti@l(r1)
- tophys(r2,r1)
- lwz r2,TI_TASK(r2)
-
- /* stack */
- addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
- li r0,0
- tophys(r3,r1)
- stw r0,0(r3)
-
- /* load up the MMU */
- bl load_up_mmu
-
- /* ptr to phys current thread */
- tophys(r4,r2)
- addi r4,r4,THREAD /* phys address of our thread_struct */
- CLR_TOP32(r4)
- mtspr SPRN_SPRG3,r4
- li r3,0
- mtspr SPRN_SPRG2,r3 /* 0 => not in RTAS */
-
- /* enable MMU and jump to start_secondary */
- li r4,MSR_KERNEL
- FIX_SRR1(r4,r5)
- lis r3,start_secondary@h
- ori r3,r3,start_secondary@l
- mtspr SPRN_SRR0,r3
- mtspr SPRN_SRR1,r4
- SYNC
- RFI
-#endif /* CONFIG_SMP */
-
-/*
- * Those generic dummy functions are kept for CPUs not
- * included in CONFIG_6xx
- */
-#if !defined(CONFIG_6xx)
-_GLOBAL(__save_cpu_setup)
- blr
-_GLOBAL(__restore_cpu_setup)
- blr
-#endif /* !defined(CONFIG_6xx) */
-
-
-/*
- * Load stuff into the MMU. Intended to be called with
- * IR=0 and DR=0.
- */
-load_up_mmu:
- sync /* Force all PTE updates to finish */
- isync
- tlbia /* Clear all TLB entries */
- sync /* wait for tlbia/tlbie to finish */
- TLBSYNC /* ... on all CPUs */
- /* Load the SDR1 register (hash table base & size) */
- lis r6,_SDR1@ha
- tophys(r6,r6)
- lwz r6,_SDR1@l(r6)
- mtspr SPRN_SDR1,r6
- li r0,16 /* load up segment register values */
- mtctr r0 /* for context 0 */
- lis r3,0x2000 /* Ku = 1, VSID = 0 */
- li r4,0
-3: mtsrin r3,r4
- addi r3,r3,0x111 /* increment VSID */
- addis r4,r4,0x1000 /* address of next segment */
- bdnz 3b
-
-/* Load the BAT registers with the values set up by MMU_init.
- MMU_init takes care of whether we're on a 601 or not. */
- mfpvr r3
- srwi r3,r3,16
- cmpwi r3,1
- lis r3,BATS@ha
- addi r3,r3,BATS@l
- tophys(r3,r3)
- LOAD_BAT(0,r3,r4,r5)
- LOAD_BAT(1,r3,r4,r5)
- LOAD_BAT(2,r3,r4,r5)
- LOAD_BAT(3,r3,r4,r5)
-
- blr
-
-/*
- * This is where the main kernel code starts.
- */
-start_here:
- /* ptr to current */
- lis r2,init_task@h
- ori r2,r2,init_task@l
- /* Set up for using our exception vectors */
- /* ptr to phys current thread */
- tophys(r4,r2)
- addi r4,r4,THREAD /* init task's THREAD */
- CLR_TOP32(r4)
- mtspr SPRN_SPRG3,r4
- li r3,0
- mtspr SPRN_SPRG2,r3 /* 0 => not in RTAS */
-
- /* 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)
-/*
- * Do early bootinfo parsing, platform-specific initialization,
- * and set up the MMU.
- */
- mr r3,r31
- mr r4,r30
- mr r5,r29
- mr r6,r28
- mr r7,r27
- bl machine_init
- bl MMU_init
-
-/*
- * Go back to running unmapped so we can load up new values
- * for SDR1 (hash table pointer) and the segment registers
- * and change to using our exception vectors.
- */
- lis r4,2f@h
- ori r4,r4,2f@l
- tophys(r4,r4)
- li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
- FIX_SRR1(r3,r5)
- mtspr SPRN_SRR0,r4
- mtspr SPRN_SRR1,r3
- SYNC
- RFI
-/* Load up the kernel context */
-2: bl load_up_mmu
-
-#ifdef CONFIG_BDI_SWITCH
- /* Add helper information for the Abatron bdiGDB debugger.
- * We do this here because we know the mmu is disabled, and
- * will be enabled for real in just a few instructions.
- */
- lis r5, abatron_pteptrs@h
- ori r5, r5, abatron_pteptrs@l
- stw r5, 0xf0(r0) /* This much match your Abatron config */
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
- tophys(r5, r5)
- stw r6, 0(r5)
-#endif /* CONFIG_BDI_SWITCH */
-
-/* Now turn on the MMU for real! */
- li r4,MSR_KERNEL
- FIX_SRR1(r4,r5)
- lis r3,start_kernel@h
- ori r3,r3,start_kernel@l
- mtspr SPRN_SRR0,r3
- mtspr SPRN_SRR1,r4
- SYNC
- RFI
-
-/*
- * Set up the segment registers for a new context.
- */
-_GLOBAL(set_context)
- mulli r3,r3,897 /* multiply context by skew factor */
- rlwinm r3,r3,4,8,27 /* VSID = (context & 0xfffff) << 4 */
- addis r3,r3,0x6000 /* Set Ks, Ku bits */
- li r0,NUM_USER_SEGMENTS
- mtctr r0
-
-#ifdef CONFIG_BDI_SWITCH
- /* Context switch the PTE pointer for the Abatron BDI2000.
- * The PGDIR is passed as second argument.
- */
- lis r5, KERNELBASE@h
- lwz r5, 0xf0(r5)
- stw r4, 0x4(r5)
-#endif
- li r4,0
- isync
-3:
- mtsrin r3,r4
- addi r3,r3,0x111 /* next VSID */
- rlwinm r3,r3,0,8,3 /* clear out any overflow from VSID field */
- addis r4,r4,0x1000 /* address of next segment */
- bdnz 3b
- sync
- isync
- blr
-
-/*
- * An undocumented "feature" of 604e requires that the v bit
- * be cleared before changing BAT values.
- *
- * Also, newer IBM firmware does not clear bat3 and 4 so
- * this makes sure it's done.
- * -- Cort
- */
-clear_bats:
- li r10,0
- mfspr r9,SPRN_PVR
- rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */
- cmpwi r9, 1
- beq 1f
-
- mtspr SPRN_DBAT0U,r10
- mtspr SPRN_DBAT0L,r10
- mtspr SPRN_DBAT1U,r10
- mtspr SPRN_DBAT1L,r10
- mtspr SPRN_DBAT2U,r10
- mtspr SPRN_DBAT2L,r10
- mtspr SPRN_DBAT3U,r10
- mtspr SPRN_DBAT3L,r10
-1:
- mtspr SPRN_IBAT0U,r10
- mtspr SPRN_IBAT0L,r10
- mtspr SPRN_IBAT1U,r10
- mtspr SPRN_IBAT1L,r10
- mtspr SPRN_IBAT2U,r10
- mtspr SPRN_IBAT2L,r10
- mtspr SPRN_IBAT3U,r10
- mtspr SPRN_IBAT3L,r10
-BEGIN_FTR_SECTION
- /* Here's a tweak: at this point, CPU setup have
- * not been called yet, so HIGH_BAT_EN may not be
- * set in HID0 for the 745x processors. However, it
- * seems that doesn't affect our ability to actually
- * write to these SPRs.
- */
- mtspr SPRN_DBAT4U,r10
- mtspr SPRN_DBAT4L,r10
- mtspr SPRN_DBAT5U,r10
- mtspr SPRN_DBAT5L,r10
- mtspr SPRN_DBAT6U,r10
- mtspr SPRN_DBAT6L,r10
- mtspr SPRN_DBAT7U,r10
- mtspr SPRN_DBAT7L,r10
- mtspr SPRN_IBAT4U,r10
- mtspr SPRN_IBAT4L,r10
- mtspr SPRN_IBAT5U,r10
- mtspr SPRN_IBAT5L,r10
- mtspr SPRN_IBAT6U,r10
- mtspr SPRN_IBAT6L,r10
- mtspr SPRN_IBAT7U,r10
- mtspr SPRN_IBAT7L,r10
-END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS)
- blr
-
-flush_tlbs:
- lis r10, 0x40
-1: addic. r10, r10, -0x1000
- tlbie r10
- blt 1b
- sync
- blr
-
-mmu_off:
- addi r4, r3, __after_mmu_off - _start
- mfmsr r3
- andi. r0,r3,MSR_DR|MSR_IR /* MMU enabled? */
- beqlr
- andc r3,r3,r0
- mtspr SPRN_SRR0,r4
- mtspr SPRN_SRR1,r3
- sync
- RFI
-
-/*
- * Use the first pair of BAT registers to map the 1st 16MB
- * of RAM to KERNELBASE. From this point on we can't safely
- * call OF any more.
- */
-initial_bats:
- lis r11,KERNELBASE@h
- mfspr r9,SPRN_PVR
- rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */
- cmpwi 0,r9,1
- bne 4f
- ori r11,r11,4 /* set up BAT registers for 601 */
- li r8,0x7f /* valid, block length = 8MB */
- oris r9,r11,0x800000@h /* set up BAT reg for 2nd 8M */
- oris r10,r8,0x800000@h /* set up BAT reg for 2nd 8M */
- mtspr SPRN_IBAT0U,r11 /* N.B. 601 has valid bit in */
- mtspr SPRN_IBAT0L,r8 /* lower BAT register */
- mtspr SPRN_IBAT1U,r9
- mtspr SPRN_IBAT1L,r10
- isync
- blr
-
-4: tophys(r8,r11)
-#ifdef CONFIG_SMP
- ori r8,r8,0x12 /* R/W access, M=1 */
-#else
- ori r8,r8,2 /* R/W access */
-#endif /* CONFIG_SMP */
- ori r11,r11,BL_256M<<2|0x2 /* set up BAT registers for 604 */
-
- mtspr SPRN_DBAT0L,r8 /* N.B. 6xx (not 601) have valid */
- mtspr SPRN_DBAT0U,r11 /* bit in upper BAT register */
- mtspr SPRN_IBAT0L,r8
- mtspr SPRN_IBAT0U,r11
- isync
- blr
-
-#ifdef CONFIG_BOOTX_TEXT
-setup_disp_bat:
- /*
- * setup the display bat prepared for us in prom.c
- */
- mflr r8
- bl reloc_offset
- mtlr r8
- addis r8,r3,disp_BAT@ha
- addi r8,r8,disp_BAT@l
- lwz r11,0(r8)
- lwz r8,4(r8)
- mfspr r9,SPRN_PVR
- rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */
- cmpwi 0,r9,1
- beq 1f
- mtspr SPRN_DBAT3L,r8
- mtspr SPRN_DBAT3U,r11
- blr
-1: mtspr SPRN_IBAT3L,r8
- mtspr SPRN_IBAT3U,r11
- blr
-
-#endif /* defined(CONFIG_BOOTX_TEXT) */
-
-#ifdef CONFIG_8260
-/* Jump into the system reset for the rom.
- * We first disable the MMU, and then jump to the ROM reset address.
- *
- * r3 is the board info structure, r4 is the location for starting.
- * I use this for building a small kernel that can load other kernels,
- * rather than trying to write or rely on a rom monitor that can tftp load.
- */
- .globl m8260_gorom
-m8260_gorom:
- mfmsr r0
- rlwinm r0,r0,0,17,15 /* clear MSR_EE in r0 */
- sync
- mtmsr r0
- sync
- mfspr r11, SPRN_HID0
- lis r10, 0
- ori r10,r10,HID0_ICE|HID0_DCE
- andc r11, r11, r10
- mtspr SPRN_HID0, r11
- isync
- li r5, MSR_ME|MSR_RI
- lis r6,2f@h
- addis r6,r6,-KERNELBASE@h
- ori r6,r6,2f@l
- mtspr SPRN_SRR0,r6
- mtspr SPRN_SRR1,r5
- isync
- sync
- rfi
-2:
- mtlr r4
- blr
-#endif
-
-
-/*
- * 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
-empty_zero_page:
- .space 4096
-
- .globl swapper_pg_dir
-swapper_pg_dir:
- .space 4096
-
-/*
- * This space gets a copy of optional info passed to us by the bootstrap
- * Used to pass parameters into the kernel like root=/dev/sda1, etc.
- */
- .globl cmd_line
-cmd_line:
- .space 512
-
- .globl intercept_table
-intercept_table:
- .long 0, 0, i0x200, i0x300, i0x400, 0, i0x600, i0x700
- .long i0x800, 0, 0, 0, 0, i0xd00, 0, 0
- .long 0, 0, 0, i0x1300, 0, 0, 0, 0
- .long 0, 0, 0, 0, 0, 0, 0, 0
- .long 0, 0, 0, 0, 0, 0, 0, 0
- .long 0, 0, 0, 0, 0, 0, 0, 0
-
-/* Room for two PTE pointers, usually the kernel and current user pointers
- * to their respective root page table.
- */
-abatron_pteptrs:
- .space 8