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-rw-r--r--arch/ppc64/kernel/entry.S845
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diff --git a/arch/ppc64/kernel/entry.S b/arch/ppc64/kernel/entry.S
deleted file mode 100644
index 5d2fcbe384c..00000000000
--- a/arch/ppc64/kernel/entry.S
+++ /dev/null
@@ -1,845 +0,0 @@
-/*
- * arch/ppc64/kernel/entry.S
- *
- * 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).
- *
- * This file contains the system call entry code, context switch
- * code, and exception/interrupt return code for PowerPC.
- *
- * 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 <linux/config.h>
-#include <linux/errno.h>
-#include <asm/unistd.h>
-#include <asm/processor.h>
-#include <asm/page.h>
-#include <asm/mmu.h>
-#include <asm/thread_info.h>
-#include <asm/ppc_asm.h>
-#include <asm/asm-offsets.h>
-#include <asm/cputable.h>
-
-#ifdef CONFIG_PPC_ISERIES
-#define DO_SOFT_DISABLE
-#endif
-
-/*
- * System calls.
- */
- .section ".toc","aw"
-.SYS_CALL_TABLE:
- .tc .sys_call_table[TC],.sys_call_table
-
-.SYS_CALL_TABLE32:
- .tc .sys_call_table32[TC],.sys_call_table32
-
-/* This value is used to mark exception frames on the stack. */
-exception_marker:
- .tc ID_72656773_68657265[TC],0x7265677368657265
-
- .section ".text"
- .align 7
-
-#undef SHOW_SYSCALLS
-
- .globl system_call_common
-system_call_common:
- andi. r10,r12,MSR_PR
- mr r10,r1
- addi r1,r1,-INT_FRAME_SIZE
- beq- 1f
- ld r1,PACAKSAVE(r13)
-1: std r10,0(r1)
- std r11,_NIP(r1)
- std r12,_MSR(r1)
- std r0,GPR0(r1)
- std r10,GPR1(r1)
- std r2,GPR2(r1)
- std r3,GPR3(r1)
- std r4,GPR4(r1)
- std r5,GPR5(r1)
- std r6,GPR6(r1)
- std r7,GPR7(r1)
- std r8,GPR8(r1)
- li r11,0
- std r11,GPR9(r1)
- std r11,GPR10(r1)
- std r11,GPR11(r1)
- std r11,GPR12(r1)
- std r9,GPR13(r1)
- crclr so
- mfcr r9
- mflr r10
- li r11,0xc01
- std r9,_CCR(r1)
- std r10,_LINK(r1)
- std r11,_TRAP(r1)
- mfxer r9
- mfctr r10
- std r9,_XER(r1)
- std r10,_CTR(r1)
- std r3,ORIG_GPR3(r1)
- ld r2,PACATOC(r13)
- addi r9,r1,STACK_FRAME_OVERHEAD
- ld r11,exception_marker@toc(r2)
- std r11,-16(r9) /* "regshere" marker */
-#ifdef CONFIG_PPC_ISERIES
- /* Hack for handling interrupts when soft-enabling on iSeries */
- cmpdi cr1,r0,0x5555 /* syscall 0x5555 */
- andi. r10,r12,MSR_PR /* from kernel */
- crand 4*cr0+eq,4*cr1+eq,4*cr0+eq
- beq hardware_interrupt_entry
- lbz r10,PACAPROCENABLED(r13)
- std r10,SOFTE(r1)
-#endif
- mfmsr r11
- ori r11,r11,MSR_EE
- mtmsrd r11,1
-
-#ifdef SHOW_SYSCALLS
- bl .do_show_syscall
- REST_GPR(0,r1)
- REST_4GPRS(3,r1)
- REST_2GPRS(7,r1)
- addi r9,r1,STACK_FRAME_OVERHEAD
-#endif
- clrrdi r11,r1,THREAD_SHIFT
- li r12,0
- ld r10,TI_FLAGS(r11)
- stb r12,TI_SC_NOERR(r11)
- andi. r11,r10,_TIF_SYSCALL_T_OR_A
- bne- syscall_dotrace
-syscall_dotrace_cont:
- cmpldi 0,r0,NR_syscalls
- bge- syscall_enosys
-
-system_call: /* label this so stack traces look sane */
-/*
- * Need to vector to 32 Bit or default sys_call_table here,
- * based on caller's run-mode / personality.
- */
- ld r11,.SYS_CALL_TABLE@toc(2)
- andi. r10,r10,_TIF_32BIT
- beq 15f
- ld r11,.SYS_CALL_TABLE32@toc(2)
- clrldi r3,r3,32
- clrldi r4,r4,32
- clrldi r5,r5,32
- clrldi r6,r6,32
- clrldi r7,r7,32
- clrldi r8,r8,32
-15:
- slwi r0,r0,3
- ldx r10,r11,r0 /* Fetch system call handler [ptr] */
- mtctr r10
- bctrl /* Call handler */
-
-syscall_exit:
-#ifdef SHOW_SYSCALLS
- std r3,GPR3(r1)
- bl .do_show_syscall_exit
- ld r3,GPR3(r1)
-#endif
- std r3,RESULT(r1)
- ld r5,_CCR(r1)
- li r10,-_LAST_ERRNO
- cmpld r3,r10
- clrrdi r12,r1,THREAD_SHIFT
- bge- syscall_error
-syscall_error_cont:
-
- /* check for syscall tracing or audit */
- ld r9,TI_FLAGS(r12)
- andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
- bne- syscall_exit_trace
-syscall_exit_trace_cont:
-
- /* disable interrupts so current_thread_info()->flags can't change,
- and so that we don't get interrupted after loading SRR0/1. */
- ld r8,_MSR(r1)
- andi. r10,r8,MSR_RI
- beq- unrecov_restore
- mfmsr r10
- rldicl r10,r10,48,1
- rotldi r10,r10,16
- mtmsrd r10,1
- ld r9,TI_FLAGS(r12)
- andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED)
- bne- syscall_exit_work
- ld r7,_NIP(r1)
- stdcx. r0,0,r1 /* to clear the reservation */
- andi. r6,r8,MSR_PR
- ld r4,_LINK(r1)
- beq- 1f /* only restore r13 if */
- ld r13,GPR13(r1) /* returning to usermode */
-1: ld r2,GPR2(r1)
- li r12,MSR_RI
- andc r10,r10,r12
- mtmsrd r10,1 /* clear MSR.RI */
- ld r1,GPR1(r1)
- mtlr r4
- mtcr r5
- mtspr SPRN_SRR0,r7
- mtspr SPRN_SRR1,r8
- rfid
- b . /* prevent speculative execution */
-
-syscall_enosys:
- li r3,-ENOSYS
- std r3,RESULT(r1)
- clrrdi r12,r1,THREAD_SHIFT
- ld r5,_CCR(r1)
-
-syscall_error:
- lbz r11,TI_SC_NOERR(r12)
- cmpwi 0,r11,0
- bne- syscall_error_cont
- neg r3,r3
- oris r5,r5,0x1000 /* Set SO bit in CR */
- std r5,_CCR(r1)
- b syscall_error_cont
-
-/* Traced system call support */
-syscall_dotrace:
- bl .save_nvgprs
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl .do_syscall_trace_enter
- ld r0,GPR0(r1) /* Restore original registers */
- ld r3,GPR3(r1)
- ld r4,GPR4(r1)
- ld r5,GPR5(r1)
- ld r6,GPR6(r1)
- ld r7,GPR7(r1)
- ld r8,GPR8(r1)
- addi r9,r1,STACK_FRAME_OVERHEAD
- clrrdi r10,r1,THREAD_SHIFT
- ld r10,TI_FLAGS(r10)
- b syscall_dotrace_cont
-
-syscall_exit_trace:
- std r3,GPR3(r1)
- bl .save_nvgprs
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl .do_syscall_trace_leave
- REST_NVGPRS(r1)
- ld r3,GPR3(r1)
- ld r5,_CCR(r1)
- clrrdi r12,r1,THREAD_SHIFT
- b syscall_exit_trace_cont
-
-/* Stuff to do on exit from a system call. */
-syscall_exit_work:
- std r3,GPR3(r1)
- std r5,_CCR(r1)
- b .ret_from_except_lite
-
-/* Save non-volatile GPRs, if not already saved. */
-_GLOBAL(save_nvgprs)
- ld r11,_TRAP(r1)
- andi. r0,r11,1
- beqlr-
- SAVE_NVGPRS(r1)
- clrrdi r0,r11,1
- std r0,_TRAP(r1)
- blr
-
-/*
- * The sigsuspend and rt_sigsuspend system calls can call do_signal
- * and thus put the process into the stopped state where we might
- * want to examine its user state with ptrace. Therefore we need
- * to save all the nonvolatile registers (r14 - r31) before calling
- * the C code. Similarly, fork, vfork and clone need the full
- * register state on the stack so that it can be copied to the child.
- */
-_GLOBAL(ppc32_sigsuspend)
- bl .save_nvgprs
- bl .compat_sys_sigsuspend
- b 70f
-
-_GLOBAL(ppc64_rt_sigsuspend)
- bl .save_nvgprs
- bl .sys_rt_sigsuspend
- b 70f
-
-_GLOBAL(ppc32_rt_sigsuspend)
- bl .save_nvgprs
- bl .compat_sys_rt_sigsuspend
-70: cmpdi 0,r3,0
- /* If it returned an error, we need to return via syscall_exit to set
- the SO bit in cr0 and potentially stop for ptrace. */
- bne syscall_exit
- /* If sigsuspend() returns zero, we are going into a signal handler. We
- may need to call audit_syscall_exit() to mark the exit from sigsuspend() */
-#ifdef CONFIG_AUDIT
- ld r3,PACACURRENT(r13)
- ld r4,AUDITCONTEXT(r3)
- cmpdi 0,r4,0
- beq .ret_from_except /* No audit_context: Leave immediately. */
- li r4, 2 /* AUDITSC_FAILURE */
- li r5,-4 /* It's always -EINTR */
- bl .audit_syscall_exit
-#endif
- b .ret_from_except
-
-_GLOBAL(ppc_fork)
- bl .save_nvgprs
- bl .sys_fork
- b syscall_exit
-
-_GLOBAL(ppc_vfork)
- bl .save_nvgprs
- bl .sys_vfork
- b syscall_exit
-
-_GLOBAL(ppc_clone)
- bl .save_nvgprs
- bl .sys_clone
- b syscall_exit
-
-_GLOBAL(ppc32_swapcontext)
- bl .save_nvgprs
- bl .compat_sys_swapcontext
- b 80f
-
-_GLOBAL(ppc64_swapcontext)
- bl .save_nvgprs
- bl .sys_swapcontext
- b 80f
-
-_GLOBAL(ppc32_sigreturn)
- bl .compat_sys_sigreturn
- b 80f
-
-_GLOBAL(ppc32_rt_sigreturn)
- bl .compat_sys_rt_sigreturn
- b 80f
-
-_GLOBAL(ppc64_rt_sigreturn)
- bl .sys_rt_sigreturn
-
-80: cmpdi 0,r3,0
- blt syscall_exit
- clrrdi r4,r1,THREAD_SHIFT
- ld r4,TI_FLAGS(r4)
- andi. r4,r4,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
- beq+ 81f
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl .do_syscall_trace_leave
-81: b .ret_from_except
-
-_GLOBAL(ret_from_fork)
- bl .schedule_tail
- REST_NVGPRS(r1)
- li r3,0
- b syscall_exit
-
-/*
- * This routine switches between two different tasks. The process
- * state of one is saved on its kernel stack. Then the state
- * of the other is restored from its kernel stack. The memory
- * management hardware is updated to the second process's state.
- * Finally, we can return to the second process, via ret_from_except.
- * On entry, r3 points to the THREAD for the current task, r4
- * points to the THREAD for the new task.
- *
- * Note: there are two ways to get to the "going out" portion
- * of this code; either by coming in via the entry (_switch)
- * or via "fork" which must set up an environment equivalent
- * to the "_switch" path. If you change this you'll have to change
- * the fork code also.
- *
- * The code which creates the new task context is in 'copy_thread'
- * in arch/ppc64/kernel/process.c
- */
- .align 7
-_GLOBAL(_switch)
- mflr r0
- std r0,16(r1)
- stdu r1,-SWITCH_FRAME_SIZE(r1)
- /* r3-r13 are caller saved -- Cort */
- SAVE_8GPRS(14, r1)
- SAVE_10GPRS(22, r1)
- mflr r20 /* Return to switch caller */
- mfmsr r22
- li r0, MSR_FP
-#ifdef CONFIG_ALTIVEC
-BEGIN_FTR_SECTION
- oris r0,r0,MSR_VEC@h /* Disable altivec */
- mfspr r24,SPRN_VRSAVE /* save vrsave register value */
- std r24,THREAD_VRSAVE(r3)
-END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
-#endif /* CONFIG_ALTIVEC */
- and. r0,r0,r22
- beq+ 1f
- andc r22,r22,r0
- mtmsrd r22
- isync
-1: std r20,_NIP(r1)
- mfcr r23
- std r23,_CCR(r1)
- std r1,KSP(r3) /* Set old stack pointer */
-
-#ifdef CONFIG_SMP
- /* We need a sync somewhere here to make sure that if the
- * previous task gets rescheduled on another CPU, it sees all
- * stores it has performed on this one.
- */
- sync
-#endif /* CONFIG_SMP */
-
- addi r6,r4,-THREAD /* Convert THREAD to 'current' */
- std r6,PACACURRENT(r13) /* Set new 'current' */
-
- ld r8,KSP(r4) /* new stack pointer */
-BEGIN_FTR_SECTION
- clrrdi r6,r8,28 /* get its ESID */
- clrrdi r9,r1,28 /* get current sp ESID */
- clrldi. r0,r6,2 /* is new ESID c00000000? */
- cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
- cror eq,4*cr1+eq,eq
- beq 2f /* if yes, don't slbie it */
-
- /* Bolt in the new stack SLB entry */
- ld r7,KSP_VSID(r4) /* Get new stack's VSID */
- oris r0,r6,(SLB_ESID_V)@h
- ori r0,r0,(SLB_NUM_BOLTED-1)@l
- slbie r6
- slbie r6 /* Workaround POWER5 < DD2.1 issue */
- slbmte r7,r0
- isync
-
-2:
-END_FTR_SECTION_IFSET(CPU_FTR_SLB)
- clrrdi r7,r8,THREAD_SHIFT /* base of new stack */
- /* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
- because we don't need to leave the 288-byte ABI gap at the
- top of the kernel stack. */
- addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE
-
- mr r1,r8 /* start using new stack pointer */
- std r7,PACAKSAVE(r13)
-
- ld r6,_CCR(r1)
- mtcrf 0xFF,r6
-
-#ifdef CONFIG_ALTIVEC
-BEGIN_FTR_SECTION
- ld r0,THREAD_VRSAVE(r4)
- mtspr SPRN_VRSAVE,r0 /* if G4, restore VRSAVE reg */
-END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
-#endif /* CONFIG_ALTIVEC */
-
- /* r3-r13 are destroyed -- Cort */
- REST_8GPRS(14, r1)
- REST_10GPRS(22, r1)
-
- /* convert old thread to its task_struct for return value */
- addi r3,r3,-THREAD
- ld r7,_NIP(r1) /* Return to _switch caller in new task */
- mtlr r7
- addi r1,r1,SWITCH_FRAME_SIZE
- blr
-
- .align 7
-_GLOBAL(ret_from_except)
- ld r11,_TRAP(r1)
- andi. r0,r11,1
- bne .ret_from_except_lite
- REST_NVGPRS(r1)
-
-_GLOBAL(ret_from_except_lite)
- /*
- * Disable interrupts so that current_thread_info()->flags
- * can't change between when we test it and when we return
- * from the interrupt.
- */
- mfmsr r10 /* Get current interrupt state */
- rldicl r9,r10,48,1 /* clear MSR_EE */
- rotldi r9,r9,16
- mtmsrd r9,1 /* Update machine state */
-
-#ifdef CONFIG_PREEMPT
- clrrdi r9,r1,THREAD_SHIFT /* current_thread_info() */
- li r0,_TIF_NEED_RESCHED /* bits to check */
- ld r3,_MSR(r1)
- ld r4,TI_FLAGS(r9)
- /* Move MSR_PR bit in r3 to _TIF_SIGPENDING position in r0 */
- rlwimi r0,r3,32+TIF_SIGPENDING-MSR_PR_LG,_TIF_SIGPENDING
- and. r0,r4,r0 /* check NEED_RESCHED and maybe SIGPENDING */
- bne do_work
-
-#else /* !CONFIG_PREEMPT */
- ld r3,_MSR(r1) /* Returning to user mode? */
- andi. r3,r3,MSR_PR
- beq restore /* if not, just restore regs and return */
-
- /* Check current_thread_info()->flags */
- clrrdi r9,r1,THREAD_SHIFT
- ld r4,TI_FLAGS(r9)
- andi. r0,r4,_TIF_USER_WORK_MASK
- bne do_work
-#endif
-
-restore:
-#ifdef CONFIG_PPC_ISERIES
- ld r5,SOFTE(r1)
- cmpdi 0,r5,0
- beq 4f
- /* Check for pending interrupts (iSeries) */
- ld r3,PACALPPACA+LPPACAANYINT(r13)
- cmpdi r3,0
- beq+ 4f /* skip do_IRQ if no interrupts */
-
- li r3,0
- stb r3,PACAPROCENABLED(r13) /* ensure we are soft-disabled */
- ori r10,r10,MSR_EE
- mtmsrd r10 /* hard-enable again */
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl .do_IRQ
- b .ret_from_except_lite /* loop back and handle more */
-
-4: stb r5,PACAPROCENABLED(r13)
-#endif
-
- ld r3,_MSR(r1)
- andi. r0,r3,MSR_RI
- beq- unrecov_restore
-
- andi. r0,r3,MSR_PR
-
- /*
- * r13 is our per cpu area, only restore it if we are returning to
- * userspace
- */
- beq 1f
- REST_GPR(13, r1)
-1:
- ld r3,_CTR(r1)
- ld r0,_LINK(r1)
- mtctr r3
- mtlr r0
- ld r3,_XER(r1)
- mtspr SPRN_XER,r3
-
- REST_8GPRS(5, r1)
-
- stdcx. r0,0,r1 /* to clear the reservation */
-
- mfmsr r0
- li r2, MSR_RI
- andc r0,r0,r2
- mtmsrd r0,1
-
- ld r0,_MSR(r1)
- mtspr SPRN_SRR1,r0
-
- ld r2,_CCR(r1)
- mtcrf 0xFF,r2
- ld r2,_NIP(r1)
- mtspr SPRN_SRR0,r2
-
- ld r0,GPR0(r1)
- ld r2,GPR2(r1)
- ld r3,GPR3(r1)
- ld r4,GPR4(r1)
- ld r1,GPR1(r1)
-
- rfid
- b . /* prevent speculative execution */
-
-/* Note: this must change if we start using the TIF_NOTIFY_RESUME bit */
-do_work:
-#ifdef CONFIG_PREEMPT
- andi. r0,r3,MSR_PR /* Returning to user mode? */
- bne user_work
- /* Check that preempt_count() == 0 and interrupts are enabled */
- lwz r8,TI_PREEMPT(r9)
- cmpwi cr1,r8,0
-#ifdef CONFIG_PPC_ISERIES
- ld r0,SOFTE(r1)
- cmpdi r0,0
-#else
- andi. r0,r3,MSR_EE
-#endif
- crandc eq,cr1*4+eq,eq
- bne restore
- /* here we are preempting the current task */
-1:
-#ifdef CONFIG_PPC_ISERIES
- li r0,1
- stb r0,PACAPROCENABLED(r13)
-#endif
- ori r10,r10,MSR_EE
- mtmsrd r10,1 /* reenable interrupts */
- bl .preempt_schedule
- mfmsr r10
- clrrdi r9,r1,THREAD_SHIFT
- rldicl r10,r10,48,1 /* disable interrupts again */
- rotldi r10,r10,16
- mtmsrd r10,1
- ld r4,TI_FLAGS(r9)
- andi. r0,r4,_TIF_NEED_RESCHED
- bne 1b
- b restore
-
-user_work:
-#endif
- /* Enable interrupts */
- ori r10,r10,MSR_EE
- mtmsrd r10,1
-
- andi. r0,r4,_TIF_NEED_RESCHED
- beq 1f
- bl .schedule
- b .ret_from_except_lite
-
-1: bl .save_nvgprs
- li r3,0
- addi r4,r1,STACK_FRAME_OVERHEAD
- bl .do_signal
- b .ret_from_except
-
-unrecov_restore:
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl .unrecoverable_exception
- b unrecov_restore
-
-#ifdef CONFIG_PPC_RTAS
-/*
- * On CHRP, the Run-Time Abstraction Services (RTAS) have to be
- * called with the MMU off.
- *
- * In addition, we need to be in 32b mode, at least for now.
- *
- * Note: r3 is an input parameter to rtas, so don't trash it...
- */
-_GLOBAL(enter_rtas)
- mflr r0
- std r0,16(r1)
- stdu r1,-RTAS_FRAME_SIZE(r1) /* Save SP and create stack space. */
-
- /* Because RTAS is running in 32b mode, it clobbers the high order half
- * of all registers that it saves. We therefore save those registers
- * RTAS might touch to the stack. (r0, r3-r13 are caller saved)
- */
- SAVE_GPR(2, r1) /* Save the TOC */
- SAVE_GPR(13, r1) /* Save paca */
- SAVE_8GPRS(14, r1) /* Save the non-volatiles */
- SAVE_10GPRS(22, r1) /* ditto */
-
- mfcr r4
- std r4,_CCR(r1)
- mfctr r5
- std r5,_CTR(r1)
- mfspr r6,SPRN_XER
- std r6,_XER(r1)
- mfdar r7
- std r7,_DAR(r1)
- mfdsisr r8
- std r8,_DSISR(r1)
- mfsrr0 r9
- std r9,_SRR0(r1)
- mfsrr1 r10
- std r10,_SRR1(r1)
-
- /* There is no way it is acceptable to get here with interrupts enabled,
- * check it with the asm equivalent of WARN_ON
- */
- mfmsr r6
- andi. r0,r6,MSR_EE
-1: tdnei r0,0
-.section __bug_table,"a"
- .llong 1b,__LINE__ + 0x1000000, 1f, 2f
-.previous
-.section .rodata,"a"
-1: .asciz __FILE__
-2: .asciz "enter_rtas"
-.previous
-
- /* Unfortunately, the stack pointer and the MSR are also clobbered,
- * so they are saved in the PACA which allows us to restore
- * our original state after RTAS returns.
- */
- std r1,PACAR1(r13)
- std r6,PACASAVEDMSR(r13)
-
- /* Setup our real return addr */
- SET_REG_TO_LABEL(r4,.rtas_return_loc)
- SET_REG_TO_CONST(r9,KERNELBASE)
- sub r4,r4,r9
- mtlr r4
-
- li r0,0
- ori r0,r0,MSR_EE|MSR_SE|MSR_BE|MSR_RI
- andc r0,r6,r0
-
- li r9,1
- rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG)
- ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP
- andc r6,r0,r9
- ori r6,r6,MSR_RI
- sync /* disable interrupts so SRR0/1 */
- mtmsrd r0 /* don't get trashed */
-
- SET_REG_TO_LABEL(r4,rtas)
- ld r5,RTASENTRY(r4) /* get the rtas->entry value */
- ld r4,RTASBASE(r4) /* get the rtas->base value */
-
- mtspr SPRN_SRR0,r5
- mtspr SPRN_SRR1,r6
- rfid
- b . /* prevent speculative execution */
-
-_STATIC(rtas_return_loc)
- /* relocation is off at this point */
- mfspr r4,SPRN_SPRG3 /* Get PACA */
- SET_REG_TO_CONST(r5, KERNELBASE)
- sub r4,r4,r5 /* RELOC the PACA base pointer */
-
- mfmsr r6
- li r0,MSR_RI
- andc r6,r6,r0
- sync
- mtmsrd r6
-
- ld r1,PACAR1(r4) /* Restore our SP */
- LOADADDR(r3,.rtas_restore_regs)
- ld r4,PACASAVEDMSR(r4) /* Restore our MSR */
-
- mtspr SPRN_SRR0,r3
- mtspr SPRN_SRR1,r4
- rfid
- b . /* prevent speculative execution */
-
-_STATIC(rtas_restore_regs)
- /* relocation is on at this point */
- REST_GPR(2, r1) /* Restore the TOC */
- REST_GPR(13, r1) /* Restore paca */
- REST_8GPRS(14, r1) /* Restore the non-volatiles */
- REST_10GPRS(22, r1) /* ditto */
-
- mfspr r13,SPRN_SPRG3
-
- ld r4,_CCR(r1)
- mtcr r4
- ld r5,_CTR(r1)
- mtctr r5
- ld r6,_XER(r1)
- mtspr SPRN_XER,r6
- ld r7,_DAR(r1)
- mtdar r7
- ld r8,_DSISR(r1)
- mtdsisr r8
- ld r9,_SRR0(r1)
- mtsrr0 r9
- ld r10,_SRR1(r1)
- mtsrr1 r10
-
- addi r1,r1,RTAS_FRAME_SIZE /* Unstack our frame */
- ld r0,16(r1) /* get return address */
-
- mtlr r0
- blr /* return to caller */
-
-#endif /* CONFIG_PPC_RTAS */
-
-#ifdef CONFIG_PPC_MULTIPLATFORM
-
-_GLOBAL(enter_prom)
- mflr r0
- std r0,16(r1)
- stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */
-
- /* Because PROM is running in 32b mode, it clobbers the high order half
- * of all registers that it saves. We therefore save those registers
- * PROM might touch to the stack. (r0, r3-r13 are caller saved)
- */
- SAVE_8GPRS(2, r1)
- SAVE_GPR(13, r1)
- SAVE_8GPRS(14, r1)
- SAVE_10GPRS(22, r1)
- mfcr r4
- std r4,_CCR(r1)
- mfctr r5
- std r5,_CTR(r1)
- mfspr r6,SPRN_XER
- std r6,_XER(r1)
- mfdar r7
- std r7,_DAR(r1)
- mfdsisr r8
- std r8,_DSISR(r1)
- mfsrr0 r9
- std r9,_SRR0(r1)
- mfsrr1 r10
- std r10,_SRR1(r1)
- mfmsr r11
- std r11,_MSR(r1)
-
- /* Get the PROM entrypoint */
- ld r0,GPR4(r1)
- mtlr r0
-
- /* Switch MSR to 32 bits mode
- */
- mfmsr r11
- li r12,1
- rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
- andc r11,r11,r12
- li r12,1
- rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
- andc r11,r11,r12
- mtmsrd r11
- isync
-
- /* Restore arguments & enter PROM here... */
- ld r3,GPR3(r1)
- blrl
-
- /* Just make sure that r1 top 32 bits didn't get
- * corrupt by OF
- */
- rldicl r1,r1,0,32
-
- /* Restore the MSR (back to 64 bits) */
- ld r0,_MSR(r1)
- mtmsrd r0
- isync
-
- /* Restore other registers */
- REST_GPR(2, r1)
- REST_GPR(13, r1)
- REST_8GPRS(14, r1)
- REST_10GPRS(22, r1)
- ld r4,_CCR(r1)
- mtcr r4
- ld r5,_CTR(r1)
- mtctr r5
- ld r6,_XER(r1)
- mtspr SPRN_XER,r6
- ld r7,_DAR(r1)
- mtdar r7
- ld r8,_DSISR(r1)
- mtdsisr r8
- ld r9,_SRR0(r1)
- mtsrr0 r9
- ld r10,_SRR1(r1)
- mtsrr1 r10
-
- addi r1,r1,PROM_FRAME_SIZE
- ld r0,16(r1)
- mtlr r0
- blr
-
-#endif /* CONFIG_PPC_MULTIPLATFORM */