From: Alexandre Nikolaev <anikolae@matrox.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: ppc little-endian port
Date: Mon, 23 Apr 2001 14:58:04 -0400 [thread overview]
Message-ID: <3AE47B3C.8DF8F330@matrox.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 872 bytes --]
Hello everyone!
This is a port of Montavista's 2.4.0-test2 kernel to ppc running in
Little-Endian.
As a base, we used Sandpoint configuration, but disabled some irrelevant
code for our board (these changes are not in the patch).
We made it just for a board with CPU and RAM only, so if you want to use
anything extra (drives, PCI, etc.)
you have to look at the corresponding code and make changes accordingly
(if needed). Additionally, if you use different configuration scheme
(not sandpoint), you might have to do some other changes.
Sebastien Cote: cots01@gel.usherb.ca
Alexandre Nikoalev: anikolae@matrox.com
--
*****************************************
| Alexandre Nikolaev
| Software Designer
| Matrox Electronic Systems Ltd
| Imaging Department
| Tel. (514) 8226000 ext. 2323
| E-mail: Alexandre_Nikolaev@matrox.com
*****************************************:)
[-- Attachment #2: linux-ppcle.patch --]
[-- Type: text/plain, Size: 14627 bytes --]
diff -ru /usr/src/redhat/SOURCES/linux/arch/ppc/Makefile ./arch/ppc/Makefile
--- /usr/src/redhat/SOURCES/linux/arch/ppc/Makefile Mon Jun 19 20:59:35 2000
+++ ./arch/ppc/Makefile Fri Apr 6 14:03:29 2001
@@ -23,7 +23,7 @@
CPPFLAGS := $(CPPFLAGS) -D__powerpc__
CFLAGS := $(CFLAGS) -D__powerpc__ -fsigned-char \
-msoft-float -pipe -ffixed-r2 -Wno-uninitialized \
- -mmultiple -mstring
+# -mmultiple -mstring
CPP = $(CC) -E $(CFLAGS)
ifdef CONFIG_4xx
diff -ru /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/hashtable.S ./arch/ppc/kernel/hashtable.S
--- /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/hashtable.S Mon Jun 19 20:59:36 2000
+++ ./arch/ppc/kernel/hashtable.S Fri Apr 6 15:05:24 2001
@@ -321,7 +321,7 @@
/* Search the primary PTEG for a PTE whose 1st word matches r5 */
mtctr r2
- addi r3,r4,-8
+ addi r3,r4,-4 /* Changed from -8 to -4 by me !!!! */
1: lwzu r0,8(r3) /* get next PTE */
cmp 0,r0,r5
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
@@ -333,7 +333,7 @@
hash_page_patch_B:
xoris r3,r4,Hash_msk>>16 /* compute secondary hash */
xori r3,r3,0xffc0
- addi r3,r3,-8
+ addi r3,r3,-4 /* Changed from -8 to -4 by me !!!! */
mtctr r2
2: lwzu r0,8(r3)
cmp 0,r0,r5
@@ -343,7 +343,8 @@
/* Search the primary PTEG for an empty slot */
10: mtctr r2
- addi r3,r4,-8 /* search primary PTEG */
+ addi r3,r4,-4 /* search primary PTEG */
+ /* Changed from -8 to -4 by me !!!! */
1: lwzu r0,8(r3) /* get next PTE */
rlwinm. r0,r0,0,0,0 /* only want to check valid bit */
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
@@ -355,7 +356,7 @@
hash_page_patch_C:
xoris r3,r4,Hash_msk>>16 /* compute secondary hash */
xori r3,r3,0xffc0
- addi r3,r3,-8
+ addi r3,r3,-4 /* Changed from -8 to -4 by me !!!! */
mtctr r2
2:
lwzu r0,8(r3)
@@ -380,6 +381,7 @@
andi. r2,r2,0x38
stw r2,next_slot@l(r3)
add r3,r4,r2
+ addi r3,r3,4 /* Add 4 to realign data, by me !!!! */
11:
/* update counter of evicted pages */
lis r2,htab_evicts@ha
@@ -393,7 +395,7 @@
found_empty:
stw r5,0(r3)
found_slot:
- stw r6,4(r3)
+ stw r6,-4(r3) /* Changed to -4 to preserve LE by me !!!! */
sync
#else /* CONFIG_SMP */
@@ -543,7 +545,7 @@
lwz r6,Hash_size@l(r6) /* size in bytes */
srwi r6,r6,3 /* # PTEs */
mtctr r6
- addi r5,r5,-8
+ addi r5,r5,-4 /* Changed from -8 to -4 by me !!!! */
li r0,0
1: lwzu r6,8(r5) /* get next tag word */
cmplw 0,r6,r3
@@ -642,7 +644,7 @@
add r6,r6,r7 /* address of primary PTEG */
li r8,8
mtctr r8
- addi r7,r6,-8
+ addi r7,r6,-4 /* Changed from -8 to -4 by me !!!! */
1: lwzu r0,8(r7) /* get next PTE */
cmpw 0,r0,r3 /* see if tag matches */
bdnzf 2,1b /* while --ctr != 0 && !cr0.eq */
@@ -650,7 +652,7 @@
ori r3,r3,0x40 /* set H (alt. hash) bit */
xor r6,r6,r5 /* address of secondary PTEG */
mtctr r8
- addi r7,r6,-8
+ addi r7,r6,-4 /* Changed from -8 to -4 by me !!!! */
2: lwzu r0,8(r7) /* get next PTE */
cmpw 0,r0,r3 /* see if tag matches */
bdnzf 2,2b /* while --ctr != 0 && !cr0.eq */
diff -ru /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/head.S ./arch/ppc/kernel/head.S
--- /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/head.S Fri Apr 6 13:56:40 2001
+++ ./arch/ppc/kernel/head.S Mon Apr 23 09:10:11 2001
@@ -292,11 +299,14 @@
label: \
EXCEPTION_PROLOG; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
- li r20,MSR_KERNEL; \
+ lis r20,MSR_KERNEL@ha; \
+ addi r20,r20,MSR_KERNEL@l; \
bl transfer_to_handler; \
.long hdlr; \
.long ret_from_except
+ /* Loading of MSR_KERNEL changed by me !!!! */
+
/* System reset */
#ifdef CONFIG_SMP /* MVME/MTX and gemini start the secondary here */
#ifdef CONFIG_GEMINI
@@ -333,7 +343,9 @@
mfspr r4,DAR
stw r4,_DAR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL*/
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long do_page_fault
@@ -347,7 +359,9 @@
mfspr r4,DAR
stw r4,_DAR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!!*/
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long UnknownException
@@ -372,7 +386,9 @@
1: addi r3,r1,STACK_FRAME_OVERHEAD
mr r4,r22
mr r5,r23
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long do_page_fault
@@ -384,7 +400,9 @@
b InstructionSegment
InstructionSegmentCont:
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long UnknownException
@@ -396,7 +414,9 @@
HardwareInterrupt:
EXCEPTION_PROLOG;
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
#ifndef CONFIG_APUS
li r4,0
bl transfer_to_handler
@@ -417,7 +437,9 @@
mfspr r5,DSISR
stw r5,_DSISR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long AlignmentException
@@ -428,7 +450,9 @@
ProgramCheck:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long ProgramCheckException
@@ -438,8 +462,17 @@
. = 0x800
FPUnavailable:
EXCEPTION_PROLOG
bne load_up_fpu /* if from user, just load it up */
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
bl transfer_to_handler /* if from kernel, take a trap */
.long KernelFP
.long ret_from_except
@@ -448,7 +481,9 @@
Decrementer:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
bl transfer_to_handler
.globl timer_interrupt_intercept
timer_interrupt_intercept:
@@ -463,7 +498,9 @@
SystemCall:
EXCEPTION_PROLOG
stw r3,ORIG_GPR3(r21)
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
bl transfer_to_handler
.long DoSyscall
@@ -484,7 +521,9 @@
b Trap_0f
trap_0f_cont:
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
bl transfer_to_handler
.long UnknownException
.long ret_from_except
@@ -706,8 +745,17 @@
#ifdef CONFIG_ALTIVEC
AltiVecUnavailable:
EXCEPTION_PROLOG
bne load_up_altivec /* if from user, just load it up */
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
bl transfer_to_handler /* if from kernel, take a trap */
.long KernelAltiVec
.long ret_from_except
@@ -785,7 +839,9 @@
addi r1,r1,TASK_UNION_SIZE-STACK_FRAME_OVERHEAD
lis r24,StackOverflow@ha
addi r24,r24,StackOverflow@l
- li r20,MSR_KERNEL
+ /*li r20,MSR_KERNEL Replaced by me !!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
FIX_SRR1(r20,r22)
mtspr SRR0,r24
mtspr SRR1,r20
@@ -1213,7 +1269,9 @@
stw r3,(_CCR+4)(r21);
addi r3,r1,STACK_FRAME_OVERHEAD;
- li r20,MSR_KERNEL;
+ /*li r20,MSR_KERNEL; Replaced by me !!!!! */
+ lis r20,MSR_KERNEL@ha
+ addi r20,r20,MSR_KERNEL@l
bl transfer_to_handler;
.long do_IRQ;
.long ret_from_except
@@ -1288,7 +1346,9 @@
mtspr SPRG2,r3 /* 0 => r1 has kernel sp */
/* enable MMU and jump to start_secondary */
- li r4,MSR_KERNEL
+ /*li r4,MSR_KERNEL Replaced by me !!!! */
+ lis r4,MSR_KERNEL@ha
+ addi r4,r4,MSR_KERNEL@l
lis r3,start_secondary@h
ori r3,r3,start_secondary@l
mtspr SRR0,r3
@@ -1452,7 +1516,9 @@
lis r4,2f@h
ori r4,r4,2f@l
tophys(r4,r4)
- li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
+ /*li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR) Replaced by me !!!! */
+ lis r3,(MSR_KERNEL & ~(MSR_IR|MSR_DR))@ha
+ addi r3,r3,(MSR_KERNEL & ~(MSR_IR|MSR_DR))@l
FIX_SRR1(r3,r5)
mtspr SRR0,r4
mtspr SRR1,r3
@@ -1470,7 +1536,10 @@
bl load_up_mmu
/* Now turn on the MMU for real! */
- li r4,MSR_KERNEL
+ /*li r4,MSR_KERNEL Replaced by me !!!! */
+ lis r4,MSR_KERNEL@ha
+ addi r4,r4,MSR_KERNEL@l
+
FIX_SRR1(r4,r5)
lis r3,start_kernel@h
ori r3,r3,start_kernel@l
diff -ru /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/irq.c ./arch/ppc/kernel/irq.c
--- /usr/src/redhat/SOURCES/linux/arch/ppc/kernel/irq.c Mon Jun 19 20:59:36 2000
+++ ./arch/ppc/kernel/irq.c Fri Apr 6 15:29:33 2001
@@ -349,7 +349,8 @@
else
once++;
- ppc_md.init_IRQ();
+ if (ppc_md.init_IRQ) /* Added by me !!!! */
+ ppc_md.init_IRQ();
}
#ifdef CONFIG_SMP
Only in /usr/src/redhat/SOURCES/linux/arch/ppc/mbxboot: vmlinux.lds
Only in /usr/src/redhat/SOURCES/linux/drivers/pcmcia: Config.in.orig
diff -ru /usr/src/redhat/SOURCES/linux/include/asm-ppc/bitops.h ./include/asm-ppc/bitops.h
--- /usr/src/redhat/SOURCES/linux/include/asm-ppc/bitops.h Mon Jun 19 20:59:37 2000
+++ ./include/asm-ppc/bitops.h Wed Apr 11 13:50:25 2001
@@ -242,8 +242,12 @@
* test_and_{set,clear}_bit guarantee atomicity without
* disabling interrupts.
*/
+#if 0
#define ext2_set_bit(nr, addr) test_and_set_bit((nr) ^ 0x18, addr)
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 0x18, addr)
+#endif /* Replaced by me !!!! (to remove XOR) */
+#define ext2_set_bit(nr, addr) test_and_set_bit((nr), addr)
+#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr), addr)
#else
extern __inline__ int ext2_set_bit(int nr, void * addr)
diff -ru /usr/src/redhat/SOURCES/linux/include/asm-ppc/byteorder.h ./include/asm-ppc/byteorder.h
--- /usr/src/redhat/SOURCES/linux/include/asm-ppc/byteorder.h Mon Jun 19 20:59:37 2000
+++ ./include/asm-ppc/byteorder.h Fri Apr 6 14:34:22 2001
@@ -9,7 +9,7 @@
#ifdef __GNUC__
-extern __inline__ unsigned ld_le16(const volatile unsigned short *addr)
+extern __inline__ unsigned ld_be16(const volatile unsigned short *addr)
{
unsigned val;
@@ -17,12 +17,12 @@
return val;
}
-extern __inline__ void st_le16(volatile unsigned short *addr, const unsigned val)
+extern __inline__ void st_be16(volatile unsigned short *addr, const unsigned val)
{
__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
}
-extern __inline__ unsigned ld_le32(const volatile unsigned *addr)
+extern __inline__ unsigned ld_be32(const volatile unsigned *addr)
{
unsigned val;
@@ -30,7 +30,7 @@
return val;
}
-extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
+extern __inline__ void st_be32(volatile unsigned *addr, const unsigned val)
{
__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
}
@@ -71,18 +71,21 @@
#endif
/* The same, but returns converted value from the location pointer by addr. */
-#define __arch__swab16p(addr) ld_le16(addr)
-#define __arch__swab32p(addr) ld_le32(addr)
+#define __arch__swab16p(addr) ld_be16(addr)
+#define __arch__swab32p(addr) ld_be32(addr)
/* The same, but do the conversion in situ, ie. put the value back to addr. */
-#define __arch__swab16s(addr) st_le16(addr,*addr)
-#define __arch__swab32s(addr) st_le32(addr,*addr)
+#define __arch__swab16s(addr) st_be16(addr,*addr)
+#define __arch__swab32s(addr) st_be32(addr,*addr)
#endif /* __GNUC__ */
+/* All "le" changed to "be", and vice-versa, by me !!!! */
+
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define __BYTEORDER_HAS_U64__
#endif
-#include <linux/byteorder/big_endian.h>
+#include <linux/byteorder/little_endian.h>
+/* Changed from big_endian to little_endian by me !!!! */
#endif /* _PPC_BYTEORDER_H */
diff -ru /usr/src/redhat/SOURCES/linux/include/asm-ppc/io.h ./include/asm-ppc/io.h
--- /usr/src/redhat/SOURCES/linux/include/asm-ppc/io.h Mon Jun 19 20:59:37 2000
+++ ./include/asm-ppc/io.h Wed Apr 11 13:50:26 2001
@@ -231,7 +231,7 @@
__asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
}
-extern inline int in_le16(volatile unsigned short *addr)
+extern inline int in_be16(volatile unsigned short *addr)
{
int ret;
@@ -240,7 +240,7 @@
return ret;
}
-extern inline int in_be16(volatile unsigned short *addr)
+extern inline int in_le16(volatile unsigned short *addr)
{
int ret;
@@ -248,18 +248,18 @@
return ret;
}
-extern inline void out_le16(volatile unsigned short *addr, int val)
+extern inline void out_be16(volatile unsigned short *addr, int val)
{
__asm__ __volatile__("sthbrx %1,0,%2; eieio" : "=m" (*addr) :
"r" (val), "r" (addr));
}
-extern inline void out_be16(volatile unsigned short *addr, int val)
+extern inline void out_le16(volatile unsigned short *addr, int val)
{
__asm__ __volatile__("sth%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
}
-extern inline unsigned in_le32(volatile unsigned *addr)
+extern inline unsigned in_be32(volatile unsigned *addr)
{
unsigned ret;
@@ -268,7 +268,7 @@
return ret;
}
-extern inline unsigned in_be32(volatile unsigned *addr)
+extern inline unsigned in_le32(volatile unsigned *addr)
{
unsigned ret;
@@ -276,13 +276,13 @@
return ret;
}
-extern inline void out_le32(volatile unsigned *addr, int val)
+extern inline void out_be32(volatile unsigned *addr, int val)
{
__asm__ __volatile__("stwbrx %1,0,%2; eieio" : "=m" (*addr) :
"r" (val), "r" (addr));
}
-extern inline void out_be32(volatile unsigned *addr, int val)
+extern inline void out_le32(volatile unsigned *addr, int val)
{
__asm__ __volatile__("stw%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
}
diff -ru /usr/src/redhat/SOURCES/linux/include/asm-ppc/processor.h ./include/asm-ppc/processor.h
--- /usr/src/redhat/SOURCES/linux/include/asm-ppc/processor.h Fri Apr 6 13:56:37 2001
+++ ./include/asm-ppc/processor.h Wed Apr 11 13:50:25 2001
@@ -45,7 +45,8 @@
#ifdef CONFIG_APUS_FAST_EXCEPT
#define MSR_ MSR_ME|MSR_IP|MSR_RI
#else
-#define MSR_ MSR_ME|MSR_RI
+#define MSR_ MSR_ME|MSR_RI|MSR_LE|MSR_ILE
+/* MSD_LE and MSR_ILE added by me !!!! */
#endif
#define MSR_KERNEL MSR_|MSR_IR|MSR_DR
#define MSR_USER MSR_KERNEL|MSR_PR|MSR_EE
next reply other threads:[~2001-04-23 18:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-23 18:58 Alexandre Nikolaev [this message]
2001-04-24 0:15 ` ppc little-endian port Cort Dougan
2001-04-24 2:47 ` Dan Malek
2001-04-24 10:11 ` Gabriel Paubert
[not found] ` <3AE5595C.74644FE5@raleigh.ibm.com>
2001-04-24 14:38 ` Alexandre Nikolaev
-- strict thread matches above, loose matches on Subject: below --
2001-04-25 12:16 Zehetbauer Thomas
2001-04-28 23:16 Albert D. Cahalan
2001-04-30 17:15 ` Dan Malek
2001-04-30 18:15 ` Ralph Blach
2001-04-30 20:38 ` Cort Dougan
2001-04-30 22:14 ` Albert D. Cahalan
2001-04-30 22:44 ` Dan Malek
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