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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-07-23 23:15:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-20 10:25:11 +1000
commit2d27cfd3286966c04d4192a9db5a6c7ea60eebf1 (patch)
treea9e3feb764da5a2be1a6ef9b3a0bf694e874a424 /arch/powerpc/kernel/entry_64.S
parent32a74949b7337726e76d69f51c48715431126c6c (diff)
powerpc: Remaining 64-bit Book3E support
This contains all the bits that didn't fit in previous patches :-) This includes the actual exception handlers assembly, the changes to the kernel entry, other misc bits and wiring it all up in Kconfig. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
-rw-r--r--arch/powerpc/kernel/entry_64.S60
1 files changed, 55 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 1cb0f3d1714..66bcda34a6b 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -120,9 +120,15 @@ BEGIN_FW_FTR_SECTION
2:
END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
#endif /* CONFIG_PPC_ISERIES */
+
+ /* Hard enable interrupts */
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 1
+#else
mfmsr r11
ori r11,r11,MSR_EE
mtmsrd r11,1
+#endif /* CONFIG_PPC_BOOK3E */
#ifdef SHOW_SYSCALLS
bl .do_show_syscall
@@ -168,15 +174,25 @@ syscall_exit:
#endif
clrrdi r12,r1,THREAD_SHIFT
- /* 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)
+#ifdef CONFIG_PPC_BOOK3S
+ /* No MSR:RI on BookE */
andi. r10,r8,MSR_RI
beq- unrecov_restore
+#endif
+
+ /* Disable interrupts so current_thread_info()->flags can't change,
+ * and so that we don't get interrupted after loading SRR0/1.
+ */
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 0
+#else
mfmsr r10
rldicl r10,r10,48,1
rotldi r10,r10,16
mtmsrd r10,1
+#endif /* CONFIG_PPC_BOOK3E */
+
ld r9,TI_FLAGS(r12)
li r11,-_LAST_ERRNO
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK)
@@ -194,9 +210,13 @@ syscall_error_cont:
* userspace and we take an exception after restoring r13,
* we end up corrupting the userspace r13 value.
*/
+#ifdef CONFIG_PPC_BOOK3S
+ /* No MSR:RI on BookE */
li r12,MSR_RI
andc r11,r10,r12
mtmsrd r11,1 /* clear MSR.RI */
+#endif /* CONFIG_PPC_BOOK3S */
+
beq- 1f
ACCOUNT_CPU_USER_EXIT(r11, r12)
ld r13,GPR13(r1) /* only restore r13 if returning to usermode */
@@ -206,7 +226,7 @@ syscall_error_cont:
mtcr r5
mtspr SPRN_SRR0,r7
mtspr SPRN_SRR1,r8
- rfid
+ RFI
b . /* prevent speculative execution */
syscall_error:
@@ -276,9 +296,13 @@ syscall_exit_work:
beq .ret_from_except_lite
/* Re-enable interrupts */
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 1
+#else
mfmsr r10
ori r10,r10,MSR_EE
mtmsrd r10,1
+#endif /* CONFIG_PPC_BOOK3E */
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
@@ -380,7 +404,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
and. r0,r0,r22
beq+ 1f
andc r22,r22,r0
- mtmsrd r22
+ MTMSRD(r22)
isync
1: std r20,_NIP(r1)
mfcr r23
@@ -399,6 +423,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
std r6,PACACURRENT(r13) /* Set new 'current' */
ld r8,KSP(r4) /* new stack pointer */
+#ifdef CONFIG_PPC_BOOK3S
BEGIN_FTR_SECTION
BEGIN_FTR_SECTION_NESTED(95)
clrrdi r6,r8,28 /* get its ESID */
@@ -445,8 +470,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
slbie r6 /* Workaround POWER5 < DD2.1 issue */
slbmte r7,r0
isync
-
2:
+#endif /* !CONFIG_PPC_BOOK3S */
+
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
@@ -490,10 +516,14 @@ _GLOBAL(ret_from_except_lite)
* can't change between when we test it and when we return
* from the interrupt.
*/
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 0
+#else
mfmsr r10 /* Get current interrupt state */
rldicl r9,r10,48,1 /* clear MSR_EE */
rotldi r9,r9,16
mtmsrd r9,1 /* Update machine state */
+#endif /* CONFIG_PPC_BOOK3E */
#ifdef CONFIG_PREEMPT
clrrdi r9,r1,THREAD_SHIFT /* current_thread_info() */
@@ -540,6 +570,9 @@ ALT_FW_FTR_SECTION_END_IFCLR(FW_FEATURE_ISERIES)
rldicl r4,r3,49,63 /* r0 = (r3 >> 15) & 1 */
stb r4,PACAHARDIRQEN(r13)
+#ifdef CONFIG_PPC_BOOK3E
+ b .exception_return_book3e
+#else
ld r4,_CTR(r1)
ld r0,_LINK(r1)
mtctr r4
@@ -588,6 +621,8 @@ ALT_FW_FTR_SECTION_END_IFCLR(FW_FEATURE_ISERIES)
rfid
b . /* prevent speculative execution */
+#endif /* CONFIG_PPC_BOOK3E */
+
iseries_check_pending_irqs:
#ifdef CONFIG_PPC_ISERIES
ld r5,SOFTE(r1)
@@ -638,6 +673,11 @@ do_work:
li r0,1
stb r0,PACASOFTIRQEN(r13)
stb r0,PACAHARDIRQEN(r13)
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 1
+ bl .preempt_schedule
+ wrteei 0
+#else
ori r10,r10,MSR_EE
mtmsrd r10,1 /* reenable interrupts */
bl .preempt_schedule
@@ -646,6 +686,7 @@ do_work:
rldicl r10,r10,48,1 /* disable interrupts again */
rotldi r10,r10,16
mtmsrd r10,1
+#endif /* CONFIG_PPC_BOOK3E */
ld r4,TI_FLAGS(r9)
andi. r0,r4,_TIF_NEED_RESCHED
bne 1b
@@ -654,8 +695,12 @@ do_work:
user_work:
#endif
/* Enable interrupts */
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 1
+#else
ori r10,r10,MSR_EE
mtmsrd r10,1
+#endif /* CONFIG_PPC_BOOK3E */
andi. r0,r4,_TIF_NEED_RESCHED
beq 1f
@@ -837,6 +882,10 @@ _GLOBAL(enter_prom)
/* Switch MSR to 32 bits mode
*/
+#ifdef CONFIG_PPC_BOOK3E
+ rlwinm r11,r11,0,1,31
+ mtmsr r11
+#else /* CONFIG_PPC_BOOK3E */
mfmsr r11
li r12,1
rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
@@ -845,6 +894,7 @@ _GLOBAL(enter_prom)
rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
andc r11,r11,r12
mtmsrd r11
+#endif /* CONFIG_PPC_BOOK3E */
isync
/* Enter PROM here... */