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Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
-rw-r--r--arch/powerpc/kernel/head_64.S163
1 files changed, 102 insertions, 61 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index e720729f3e5..71b1fe58e9e 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -35,9 +35,7 @@
#include <asm/thread_info.h>
#include <asm/firmware.h>
-#ifdef CONFIG_PPC_ISERIES
#define DO_SOFT_DISABLE
-#endif
/*
* We layout physical memory as follows:
@@ -74,13 +72,11 @@
.text
.globl _stext
_stext:
-#ifdef CONFIG_PPC_MULTIPLATFORM
_GLOBAL(__start)
/* NOP this out unconditionally */
BEGIN_FTR_SECTION
b .__start_initialization_multiplatform
END_FTR_SECTION(0, 1)
-#endif /* CONFIG_PPC_MULTIPLATFORM */
/* Catch branch to 0 in real mode */
trap
@@ -308,7 +304,9 @@ exception_marker:
std r9,_LINK(r1); \
mfctr r10; /* save CTR in stackframe */ \
std r10,_CTR(r1); \
+ lbz r10,PACASOFTIRQEN(r13); \
mfspr r11,SPRN_XER; /* save XER in stackframe */ \
+ std r10,SOFTE(r1); \
std r11,_XER(r1); \
li r9,(n)+1; \
std r9,_TRAP(r1); /* set trap number */ \
@@ -343,6 +341,34 @@ label##_pSeries: \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
+#define MASKABLE_EXCEPTION_PSERIES(n, label) \
+ . = n; \
+ .globl label##_pSeries; \
+label##_pSeries: \
+ HMT_MEDIUM; \
+ mtspr SPRN_SPRG1,r13; /* save r13 */ \
+ mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
+ std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \
+ std r10,PACA_EXGEN+EX_R10(r13); \
+ lbz r10,PACASOFTIRQEN(r13); \
+ mfcr r9; \
+ cmpwi r10,0; \
+ beq masked_interrupt; \
+ mfspr r10,SPRN_SPRG1; \
+ std r10,PACA_EXGEN+EX_R13(r13); \
+ std r11,PACA_EXGEN+EX_R11(r13); \
+ std r12,PACA_EXGEN+EX_R12(r13); \
+ clrrdi r12,r13,32; /* get high part of &label */ \
+ mfmsr r10; \
+ mfspr r11,SPRN_SRR0; /* save SRR0 */ \
+ LOAD_HANDLER(r12,label##_common) \
+ ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
+ mtspr SPRN_SRR0,r12; \
+ mfspr r12,SPRN_SRR1; /* and SRR1 */ \
+ mtspr SPRN_SRR1,r10; \
+ rfid; \
+ b . /* prevent speculative execution */
+
#define STD_EXCEPTION_ISERIES(n, label, area) \
.globl label##_iSeries; \
label##_iSeries: \
@@ -358,40 +384,32 @@ label##_iSeries: \
HMT_MEDIUM; \
mtspr SPRN_SPRG1,r13; /* save r13 */ \
EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
- lbz r10,PACAPROCENABLED(r13); \
+ lbz r10,PACASOFTIRQEN(r13); \
cmpwi 0,r10,0; \
beq- label##_iSeries_masked; \
EXCEPTION_PROLOG_ISERIES_2; \
b label##_common; \
-#ifdef DO_SOFT_DISABLE
+#ifdef CONFIG_PPC_ISERIES
#define DISABLE_INTS \
-BEGIN_FW_FTR_SECTION; \
- lbz r10,PACAPROCENABLED(r13); \
li r11,0; \
- std r10,SOFTE(r1); \
+ stb r11,PACASOFTIRQEN(r13); \
+BEGIN_FW_FTR_SECTION; \
+ stb r11,PACAHARDIRQEN(r13); \
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \
+BEGIN_FW_FTR_SECTION; \
mfmsr r10; \
- stb r11,PACAPROCENABLED(r13); \
ori r10,r10,MSR_EE; \
mtmsrd r10,1; \
END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
-#define ENABLE_INTS \
-BEGIN_FW_FTR_SECTION; \
- lbz r10,PACAPROCENABLED(r13); \
- mfmsr r11; \
- std r10,SOFTE(r1); \
- ori r11,r11,MSR_EE; \
-END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES); \
-BEGIN_FW_FTR_SECTION; \
- ld r12,_MSR(r1); \
- mfmsr r11; \
- rlwimi r11,r12,0,MSR_EE; \
-END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \
- mtmsrd r11,1
+#else
+#define DISABLE_INTS \
+ li r11,0; \
+ stb r11,PACASOFTIRQEN(r13); \
+ stb r11,PACAHARDIRQEN(r13)
-#else /* hard enable/disable interrupts */
-#define DISABLE_INTS
+#endif /* CONFIG_PPC_ISERIES */
#define ENABLE_INTS \
ld r12,_MSR(r1); \
@@ -399,8 +417,6 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \
rlwimi r11,r12,0,MSR_EE; \
mtmsrd r11,1
-#endif
-
#define STD_EXCEPTION_COMMON(trap, label, hdlr) \
.align 7; \
.globl label##_common; \
@@ -541,11 +557,11 @@ instruction_access_slb_pSeries:
mfspr r12,SPRN_SRR1 /* and SRR1 */
b .slb_miss_realmode /* Rel. branch works in real mode */
- STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
+ MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt)
STD_EXCEPTION_PSERIES(0x600, alignment)
STD_EXCEPTION_PSERIES(0x700, program_check)
STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
- STD_EXCEPTION_PSERIES(0x900, decrementer)
+ MASKABLE_EXCEPTION_PSERIES(0x900, decrementer)
STD_EXCEPTION_PSERIES(0xa00, trap_0a)
STD_EXCEPTION_PSERIES(0xb00, trap_0b)
@@ -597,7 +613,24 @@ system_call_pSeries:
/*** pSeries interrupt support ***/
/* moved from 0xf00 */
- STD_EXCEPTION_PSERIES(., performance_monitor)
+ MASKABLE_EXCEPTION_PSERIES(., performance_monitor)
+
+/*
+ * An interrupt came in while soft-disabled; clear EE in SRR1,
+ * clear paca->hard_enabled and return.
+ */
+masked_interrupt:
+ stb r10,PACAHARDIRQEN(r13)
+ mtcrf 0x80,r9
+ ld r9,PACA_EXGEN+EX_R9(r13)
+ mfspr r10,SPRN_SRR1
+ rldicl r10,r10,48,1 /* clear MSR_EE */
+ rotldi r10,r10,16
+ mtspr SPRN_SRR1,r10
+ ld r10,PACA_EXGEN+EX_R10(r13)
+ mfspr r13,SPRN_SPRG1
+ rfid
+ b .
.align 7
do_stab_bolted_pSeries:
@@ -792,7 +825,7 @@ system_reset_iSeries:
cmpwi 0,r23,0
beq iSeries_secondary_smp_loop /* Loop until told to go */
- bne .__secondary_start /* Loop until told to go */
+ bne __secondary_start /* Loop until told to go */
iSeries_secondary_smp_loop:
/* Let the Hypervisor know we are alive */
/* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
@@ -813,7 +846,6 @@ iSeries_secondary_smp_loop:
b 1b /* If SMP not configured, secondaries
* loop forever */
- .globl decrementer_iSeries_masked
decrementer_iSeries_masked:
/* We may not have a valid TOC pointer in here. */
li r11,1
@@ -824,7 +856,6 @@ decrementer_iSeries_masked:
mtspr SPRN_DEC,r12
/* fall through */
- .globl hardware_interrupt_iSeries_masked
hardware_interrupt_iSeries_masked:
mtcrf 0x80,r9 /* Restore regs */
ld r12,PACALPPACAPTR(r13)
@@ -926,10 +957,18 @@ bad_stack:
* any task or sent any task a signal, you should use
* ret_from_except or ret_from_except_lite instead of this.
*/
+fast_exc_return_irq: /* restores irq state too */
+ ld r3,SOFTE(r1)
+ ld r12,_MSR(r1)
+ stb r3,PACASOFTIRQEN(r13) /* restore paca->soft_enabled */
+ rldicl r4,r12,49,63 /* get MSR_EE to LSB */
+ stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */
+ b 1f
+
.globl fast_exception_return
fast_exception_return:
ld r12,_MSR(r1)
- ld r11,_NIP(r1)
+1: ld r11,_NIP(r1)
andi. r3,r12,MSR_RI /* check if RI is set */
beq- unrecov_fer
@@ -952,7 +991,8 @@ fast_exception_return:
REST_8GPRS(2, r1)
mfmsr r10
- clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
+ rldicl r10,r10,48,1 /* clear EE */
+ rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */
mtmsrd r10,1
mtspr SPRN_SRR1,r12
@@ -1326,6 +1366,16 @@ BEGIN_FW_FTR_SECTION
* interrupts if necessary.
*/
beq 13f
+END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
+#endif
+BEGIN_FW_FTR_SECTION
+ /*
+ * Here we have interrupts hard-disabled, so it is sufficient
+ * to restore paca->{soft,hard}_enable and get out.
+ */
+ beq fast_exc_return_irq /* Return from exception on success */
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
+
/* For a hash failure, we don't bother re-enabling interrupts */
ble- 12f
@@ -1337,14 +1387,6 @@ BEGIN_FW_FTR_SECTION
ld r3,SOFTE(r1)
bl .local_irq_restore
b 11f
-END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
-#endif
-BEGIN_FW_FTR_SECTION
- beq fast_exception_return /* Return from exception on success */
- ble- 12f /* Failure return from hash_page */
-
- /* fall through */
-END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
/* Here we have a page fault that hash_page can't handle. */
handle_page_fault:
@@ -1362,6 +1404,8 @@ handle_page_fault:
bl .bad_page_fault
b .ret_from_except
+13: b .ret_from_except_lite
+
/* We have a page fault that hash_page could handle but HV refused
* the PTE insertion
*/
@@ -1371,8 +1415,6 @@ handle_page_fault:
bl .low_hash_fault
b .ret_from_except
-13: b .ret_from_except_lite
-
/* here we have a segment miss */
do_ste_alloc:
bl .ste_allocate /* try to insert stab entry */
@@ -1560,7 +1602,7 @@ _GLOBAL(generic_secondary_smp_init)
ld r1,PACAEMERGSP(r13)
subi r1,r1,STACK_FRAME_OVERHEAD
- b .__secondary_start
+ b __secondary_start
#endif
#ifdef CONFIG_PPC_ISERIES
@@ -1595,7 +1637,6 @@ _STATIC(__start_initialization_iSeries)
b .start_here_common
#endif /* CONFIG_PPC_ISERIES */
-#ifdef CONFIG_PPC_MULTIPLATFORM
_STATIC(__mmu_off)
mfmsr r3
@@ -1621,13 +1662,11 @@ _STATIC(__mmu_off)
*
*/
_GLOBAL(__start_initialization_multiplatform)
-#ifdef CONFIG_PPC_MULTIPLATFORM
/*
* Are we booted from a PROM Of-type client-interface ?
*/
cmpldi cr0,r5,0
bne .__boot_from_prom /* yes -> prom */
-#endif
/* Save parameters */
mr r31,r3
@@ -1656,7 +1695,6 @@ _GLOBAL(__start_initialization_multiplatform)
bl .__mmu_off
b .__after_prom_start
-#ifdef CONFIG_PPC_MULTIPLATFORM
_STATIC(__boot_from_prom)
/* Save parameters */
mr r31,r3
@@ -1696,7 +1734,6 @@ _STATIC(__boot_from_prom)
bl .prom_init
/* We never return */
trap
-#endif
/*
* At this point, r3 contains the physical address we are running at,
@@ -1752,8 +1789,6 @@ _STATIC(__after_prom_start)
bl .copy_and_flush /* copy the rest */
b .start_here_multiplatform
-#endif /* CONFIG_PPC_MULTIPLATFORM */
-
/*
* Copy routine used to copy the kernel to start at physical address 0
* and flush and invalidate the caches as needed.
@@ -1836,7 +1871,7 @@ _GLOBAL(pmac_secondary_start)
ld r1,PACAEMERGSP(r13)
subi r1,r1,STACK_FRAME_OVERHEAD
- b .__secondary_start
+ b __secondary_start
#endif /* CONFIG_PPC_PMAC */
@@ -1853,7 +1888,7 @@ _GLOBAL(pmac_secondary_start)
* r13 = paca virtual address
* SPRG3 = paca virtual address
*/
-_GLOBAL(__secondary_start)
+__secondary_start:
/* Set thread priority to MEDIUM */
HMT_MEDIUM
@@ -1877,11 +1912,16 @@ _GLOBAL(__secondary_start)
/* enable MMU and jump to start_secondary */
LOAD_REG_ADDR(r3, .start_secondary_prolog)
LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
-#ifdef DO_SOFT_DISABLE
+#ifdef CONFIG_PPC_ISERIES
BEGIN_FW_FTR_SECTION
ori r4,r4,MSR_EE
END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
#endif
+BEGIN_FW_FTR_SECTION
+ stb r7,PACASOFTIRQEN(r13)
+ stb r7,PACAHARDIRQEN(r13)
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
+
mtspr SPRN_SRR0,r3
mtspr SPRN_SRR1,r4
rfid
@@ -1913,7 +1953,6 @@ _GLOBAL(enable_64b_mode)
isync
blr
-#ifdef CONFIG_PPC_MULTIPLATFORM
/*
* This is where the main kernel code starts.
*/
@@ -1977,7 +2016,6 @@ _STATIC(start_here_multiplatform)
mtspr SPRN_SRR1,r4
rfid
b . /* prevent speculative execution */
-#endif /* CONFIG_PPC_MULTIPLATFORM */
/* This is where all platforms converge execution */
_STATIC(start_here_common)
@@ -2005,15 +2043,18 @@ _STATIC(start_here_common)
/* Load up the kernel context */
5:
-#ifdef DO_SOFT_DISABLE
-BEGIN_FW_FTR_SECTION
li r5,0
- stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
+ stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */
+#ifdef CONFIG_PPC_ISERIES
+BEGIN_FW_FTR_SECTION
mfmsr r5
ori r5,r5,MSR_EE /* Hard Enabled */
mtmsrd r5
END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
#endif
+BEGIN_FW_FTR_SECTION
+ stb r5,PACAHARDIRQEN(r13)
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
bl .start_kernel
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-04 12:01:01 +0000