ppc4xx: Clean up 440 exceptions handling
- Introduced dedicated switches for building 440 and 405 images required
for 440-specific machine instructions like 'rfmci' etc.
- Exception vectors moved to the proper location (_start moved away from
the critical exception handler space, which it occupied)
- CriticalInput now serviced (with default handler)
- MachineCheck properly serviced (added a dedicated handler and return
subroutine)
- Overall cleanup of exceptions declared with STD_EXCEPTION macro (unused,
unhandled and those not relevant for 4xx were eliminated)
- Eliminated Linux leftovers, removed dead code
Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/asm-ppc/processor.h b/include/asm-ppc/processor.h
index 5efc3ee..29e6101 100644
--- a/include/asm-ppc/processor.h
+++ b/include/asm-ppc/processor.h
@@ -308,7 +308,7 @@
#define SPRN_SRR0 0x01A /* Save/Restore Register 0 */
#define SPRN_SRR1 0x01B /* Save/Restore Register 1 */
#define SPRN_SRR2 0x3DE /* Save/Restore Register 2 */
-#define SPRN_SRR3 0x3DF /* Save/Restore Register 3 */
+#define SPRN_SRR3 0x3DF /* Save/Restore Register 3 */
#ifdef CONFIG_BOOKE
#define SPRN_SVR 0x3FF /* System Version Register */
#else
@@ -451,6 +451,17 @@
#define SPRN_PID1 0x279 /* Process ID Register 1 */
#define SPRN_PID2 0x27a /* Process ID Register 2 */
#define SPRN_MCSR 0x23c /* Machine Check Syndrome register */
+#ifdef CONFIG_440
+#define MCSR_MCS 0x80000000 /* Machine Check Summary */
+#define MCSR_IB 0x40000000 /* Instruction PLB Error */
+#define MCSR_DRB 0x20000000 /* Data Read PLB Error */
+#define MCSR_DWB 0x10000000 /* Data Write PLB Error */
+#define MCSR_TLBP 0x08000000 /* TLB Parity Error */
+#define MCSR_ICP 0x04000000 /* I-Cache Parity Error */
+#define MCSR_DCSP 0x02000000 /* D-Cache Search Parity Error */
+#define MCSR_DCFP 0x01000000 /* D-Cache Flush Parity Error */
+#define MCSR_IMPE 0x00800000 /* Imprecise Machine Check Exception */
+#endif
#define ESR_ST 0x00800000 /* Store Operation */
#if defined(CONFIG_MPC86xx)
@@ -544,6 +555,8 @@
#define SPRG7 SPRN_SPRG7
#define SRR0 SPRN_SRR0 /* Save and Restore Register 0 */
#define SRR1 SPRN_SRR1 /* Save and Restore Register 1 */
+#define SRR2 SPRN_SRR2 /* Save and Restore Register 2 */
+#define SRR3 SPRN_SRR3 /* Save and Restore Register 3 */
#define SVR SPRN_SVR /* System Version Register */
#define TBRL SPRN_TBRL /* Time Base Read Lower Register */
#define TBRU SPRN_TBRU /* Time Base Read Upper Register */
diff --git a/include/configs/CPCI440.h b/include/configs/CPCI440.h
index 90d3a8d..7b5f728 100644
--- a/include/configs/CPCI440.h
+++ b/include/configs/CPCI440.h
@@ -33,6 +33,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_CPCI440 1 /* Board is ebony */
#define CONFIG_440GP 1 /* Specifc GP support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_early_init_f */
#undef CFG_DRAM_TEST /* Disable-takes long time! */
diff --git a/include/configs/KAREF.h b/include/configs/KAREF.h
index 2ad6f06..fd9bd31 100644
--- a/include/configs/KAREF.h
+++ b/include/configs/KAREF.h
@@ -38,6 +38,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_KAREF 1 /* Board is Kamino Ref Variant */
#define CONFIG_440GX 1 /* Specifc GX support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_pre_init */
#define CONFIG_MISC_INIT_F 1 /* Call board misc_init_f */
diff --git a/include/configs/METROBOX.h b/include/configs/METROBOX.h
index 465a4ec..148fe9a 100644
--- a/include/configs/METROBOX.h
+++ b/include/configs/METROBOX.h
@@ -104,6 +104,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_METROBOX 1 /* Board is Metrobox */
#define CONFIG_440GX 1 /* Specifc GX support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_pre_init */
#define CONFIG_MISC_INIT_F 1 /* Call board misc_init_f */
diff --git a/include/configs/alpr.h b/include/configs/alpr.h
index 67f62d3..47893e8 100644
--- a/include/configs/alpr.h
+++ b/include/configs/alpr.h
@@ -29,6 +29,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_ALPR 1 /* Board is ebony */
#define CONFIG_440GX 1 /* Specifc GX support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_pre_init */
#define CONFIG_LAST_STAGE_INIT 1 /* call last_stage_init() */
diff --git a/include/configs/bamboo.h b/include/configs/bamboo.h
index 763d1c7..af337ee 100644
--- a/include/configs/bamboo.h
+++ b/include/configs/bamboo.h
@@ -32,6 +32,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_BAMBOO 1 /* Board is BAMBOO */
#define CONFIG_440EP 1 /* Specific PPC440EP support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_SYS_CLK_FREQ 33333333 /* external freq to pll */
diff --git a/include/configs/ebony.h b/include/configs/ebony.h
index a42319b..5bd326b 100644
--- a/include/configs/ebony.h
+++ b/include/configs/ebony.h
@@ -32,6 +32,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_EBONY 1 /* Board is ebony */
#define CONFIG_440GP 1 /* Specifc GP support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_early_init_f */
#undef CFG_DRAM_TEST /* Disable-takes long time! */
diff --git a/include/configs/katmai.h b/include/configs/katmai.h
index cc47a16..e6ebe38 100644
--- a/include/configs/katmai.h
+++ b/include/configs/katmai.h
@@ -29,7 +29,7 @@
#ifndef __CONFIG_H
#define __CONFIG_H
-
+//#define DEBUG
/*-----------------------------------------------------------------------
* High Level Configuration Options
*----------------------------------------------------------------------*/
diff --git a/include/configs/ocotea.h b/include/configs/ocotea.h
index fe4e638..31f8bb3 100644
--- a/include/configs/ocotea.h
+++ b/include/configs/ocotea.h
@@ -41,6 +41,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_OCOTEA 1 /* Board is ebony */
#define CONFIG_440GX 1 /* Specifc GX support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_pre_init */
#undef CFG_DRAM_TEST /* Disable-takes long time! */
diff --git a/include/configs/p3p440.h b/include/configs/p3p440.h
index aa0901f..cae5bd5 100644
--- a/include/configs/p3p440.h
+++ b/include/configs/p3p440.h
@@ -35,6 +35,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_P3P440 1 /* Board is P3P440 */
#define CONFIG_440GP 1 /* Specifc GP support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_BOARD_EARLY_INIT_F 1 /* Call board_early_init_f */
#define CONFIG_MISC_INIT_R 1 /* Call misc_init_r */
diff --git a/include/configs/pcs440ep.h b/include/configs/pcs440ep.h
index 23bdfc8..638031f 100644
--- a/include/configs/pcs440ep.h
+++ b/include/configs/pcs440ep.h
@@ -32,6 +32,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_PCS440EP 1 /* Board is PCS440EP */
#define CONFIG_440EP 1 /* Specific PPC440EP support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_SYS_CLK_FREQ 33333333 /* external freq to pll */
diff --git a/include/configs/sequoia.h b/include/configs/sequoia.h
index 23243a4..42b42fc 100644
--- a/include/configs/sequoia.h
+++ b/include/configs/sequoia.h
@@ -37,6 +37,7 @@
#else
#define CONFIG_440GRX 1 /* Specific PPC440GRx */
#endif
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
/* Detect Sequoia PLL input clock automatically via CPLD bit */
#define CONFIG_SYS_CLK_FREQ ((in8(CFG_BCSR_BASE + 3) & 0x80) ? \
diff --git a/include/configs/taishan.h b/include/configs/taishan.h
index 2b28f93..cbbb006 100644
--- a/include/configs/taishan.h
+++ b/include/configs/taishan.h
@@ -30,6 +30,7 @@
*----------------------------------------------------------------------*/
#define CONFIG_TAISHAN 1 /* Board is taishan */
#define CONFIG_440GX 1 /* Specifc GX support */
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#undef CFG_DRAM_TEST /* Disable-takes long time! */
#define CONFIG_SYS_CLK_FREQ 33333333 /* external freq to pll */
diff --git a/include/configs/yosemite.h b/include/configs/yosemite.h
index b68ae54..c96b14e 100644
--- a/include/configs/yosemite.h
+++ b/include/configs/yosemite.h
@@ -38,6 +38,7 @@
#define CONFIG_440GR 1 /* Specific PPC440GR support */
#define CONFIG_HOSTNAME yellowstone
#endif
+#define CONFIG_440 1 /* ... PPC440 family */
#define CONFIG_4xx 1 /* ... PPC4xx family */
#define CONFIG_SYS_CLK_FREQ 66666666 /* external freq to pll */
diff --git a/include/ppc405.h b/include/ppc405.h
index 71ad12e..6be2a50 100644
--- a/include/ppc405.h
+++ b/include/ppc405.h
@@ -27,6 +27,15 @@
/*--------------------------------------------------------------------- */
#define srr2 0x3de /* save/restore register 2 */
#define srr3 0x3df /* save/restore register 3 */
+
+ /*
+ * 405 does not really have CSRR0/1 but SRR2/3 are used during critical
+ * exception for the exact same purposes - let's alias them and have a
+ * common handling in crit_return() and CRIT_EXCEPTION
+ */
+ #define csrr0 srr2
+ #define csrr1 srr3
+
#define dbsr 0x3f0 /* debug status register */
#define dbcr0 0x3f2 /* debug control register 0 */
#define dbcr1 0x3bd /* debug control register 1 */
diff --git a/include/ppc440.h b/include/ppc440.h
index 07f75de..4bb644e 100644
--- a/include/ppc440.h
+++ b/include/ppc440.h
@@ -82,10 +82,7 @@
#define ivor13 0x19d /* interrupt vector offset register 13 */
#define ivor14 0x19e /* interrupt vector offset register 14 */
#define ivor15 0x19f /* interrupt vector offset register 15 */
-#if defined(CONFIG_440GX) || \
- defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
- defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
- defined(CONFIG_440SP) || defined(CONFIG_440SPE)
+#if defined(CONFIG_440)
#define mcsrr0 0x23a /* machine check save/restore register 0 */
#define mcsrr1 0x23b /* mahcine check save/restore register 1 */
#define mcsr 0x23c /* machine check status register */
diff --git a/include/ppc4xx.h b/include/ppc4xx.h
index 67759c7..8cead66 100644
--- a/include/ppc4xx.h
+++ b/include/ppc4xx.h
@@ -22,6 +22,7 @@
#ifndef __PPC4XX_H__
#define __PPC4XX_H__
+#define _START_OFFSET 0x2100
#if defined(CONFIG_440)
#include <ppc440.h>
diff --git a/include/ppc_asm.tmpl b/include/ppc_asm.tmpl
index 3e47e82..f15628a 100644
--- a/include/ppc_asm.tmpl
+++ b/include/ppc_asm.tmpl
@@ -217,7 +217,7 @@
* We assume sprg3 has the physical address of the current
* task's thread_struct.
*/
-#define EXCEPTION_PROLOG \
+#define EXCEPTION_PROLOG(reg1, reg2) \
mtspr SPRG0,r20; \
mtspr SPRG1,r21; \
mfcr r20; \
@@ -235,8 +235,10 @@
stw r22,_CTR(r21); \
mfspr r20,XER; \
stw r20,_XER(r21); \
- mfspr r22,SRR0; \
- mfspr r23,SRR1; \
+ mfspr r20,DEAR; \
+ stw r20,_DAR(r21); \
+ mfspr r22,reg1; \
+ mfspr r23,reg2; \
stw r0,GPR0(r21); \
stw r1,GPR1(r21); \
stw r2,GPR2(r21); \
@@ -249,41 +251,6 @@
*/
/*
- * Critical exception entry code. This is just like the other exception
- * code except that it uses SRR2 and SRR3 instead of SRR0 and SRR1.
- */
-#define CRITICAL_EXCEPTION_PROLOG \
- mtspr SPRG0,r20; \
- mtspr SPRG1,r21; \
- mfcr r20; \
- subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
- stw r20,_CCR(r21); /* save registers */ \
- stw r22,GPR22(r21); \
- stw r23,GPR23(r21); \
- mfspr r20,SPRG0; \
- stw r20,GPR20(r21); \
- mfspr r22,SPRG1; \
- stw r22,GPR21(r21); \
- mflr r20; \
- stw r20,_LINK(r21); \
- mfctr r22; \
- stw r22,_CTR(r21); \
- mfspr r20,XER; \
- stw r20,_XER(r21); \
- mfspr r22,990; /* SRR2 */ \
- mfspr r23,991; /* SRR3 */ \
- stw r0,GPR0(r21); \
- stw r1,GPR1(r21); \
- stw r2,GPR2(r21); \
- stw r1,0(r21); \
- mr r1,r21; /* set new kernel sp */ \
- SAVE_4GPRS(3, r21);
-/*
- * Note: code which follows this uses cr0.eq (set if from kernel),
- * r21, r22 (SRR2), and r23 (SRR3).
- */
-
-/*
* Exception vectors.
*
* The data words for `hdlr' and `int_return' are initialized with
@@ -293,30 +260,45 @@
#define STD_EXCEPTION(n, label, hdlr) \
. = n; \
label: \
- EXCEPTION_PROLOG; \
+ EXCEPTION_PROLOG(SRR0, SRR1); \
lwz r3,GOT(transfer_to_handler); \
mtlr r3; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
li r20,MSR_KERNEL; \
rlwimi r20,r23,0,25,25; \
- blrl ; \
+ blrl; \
.L_ ## label : \
- .long hdlr - _start + EXC_OFF_SYS_RESET; \
- .long int_return - _start + EXC_OFF_SYS_RESET
+ .long hdlr - _start + _START_OFFSET; \
+ .long int_return - _start + _START_OFFSET
+#define CRIT_EXCEPTION(n, label, hdlr) \
+ . = n; \
+label: \
+ EXCEPTION_PROLOG(csrr0, csrr1); \
+ lwz r3,GOT(transfer_to_handler); \
+ mtlr r3; \
+ addi r3,r1,STACK_FRAME_OVERHEAD; \
+ li r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)); \
+ rlwimi r20,r23,0,25,25; \
+ blrl; \
+.L_ ## label : \
+ .long hdlr - _start + _START_OFFSET; \
+ .long crit_return - _start + _START_OFFSET
-#define CRIT_EXCEPTION(n, label, hdlr) \
- . = n; \
-label: \
- CRITICAL_EXCEPTION_PROLOG; \
- lwz r3,GOT(transfer_to_handler); \
- mtlr r3; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- li r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)); \
- rlwimi r20,r23,0,25,25; \
- blrl ; \
-.L_ ## label : \
- .long hdlr - _start + EXC_OFF_SYS_RESET; \
- .long crit_return - _start + EXC_OFF_SYS_RESET
+#ifdef CONFIG_440
+#define MCK_EXCEPTION(n, label, hdlr) \
+ . = n; \
+label: \
+ EXCEPTION_PROLOG(MCSRR0, MCSRR1); \
+ lwz r3,GOT(transfer_to_handler); \
+ mtlr r3; \
+ addi r3,r1,STACK_FRAME_OVERHEAD; \
+ li r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)); \
+ rlwimi r20,r23,0,25,25; \
+ blrl; \
+.L_ ## label : \
+ .long hdlr - _start + _START_OFFSET; \
+ .long mck_return - _start + _START_OFFSET
+#endif /* CONFIG_440 */
#endif /* __PPC_ASM_TMPL__ */