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authorJeremy Kerr <jeremy.kerr@canonical.com>2010-07-07 11:19:48 +0800
committerNicolas Pitre <nico@fluxnic.net>2010-10-20 00:27:34 -0400
commitc293393faa8e11a5a80a9e358718432b8697f451 (patch)
treed2d10ba089773e0f1a5742de7a40f8830e272935 /arch/arm
parent0ea1293009826da45e1019f45dfde1e557bb30df (diff)
downloadvexpress-lsk-c293393faa8e11a5a80a9e358718432b8697f451.tar.gz
arm: use addruart macro to establish debug mappings
Since we can get both physical and virtual addresses from the addruart macro, we can use this to establish the debug mappings. In the case of CONFIG_DEBUG_ICEDCC, we don't need any mappings, but may still need to setup r7 correctly. Incorporating ASM changes from Nicolas Pitre <npitre@fluxnic.net>. Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com> Tested-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/head.S23
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 767390449e0..dd6b369ac69 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -22,6 +22,10 @@
#include <asm/thread_info.h>
#include <asm/system.h>
+#ifdef CONFIG_DEBUG_LL
+#include <mach/debug-macro.S>
+#endif
+
#if (PHYS_OFFSET & 0x001fffff)
#error "PHYS_OFFSET must be at an even 2MiB boundary!"
#endif
@@ -204,24 +208,35 @@ __create_page_tables:
str r6, [r0]
#ifdef CONFIG_DEBUG_LL
- ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
+#ifndef CONFIG_DEBUG_ICEDCC
/*
* Map in IO space for serial debugging.
* This allows debug messages to be output
* via a serial console before paging_init.
*/
- ldr r3, [r8, #MACHINFO_PGOFFIO]
+ addruart r7, r3
+
+ mov r3, r3, lsr #20
+ mov r3, r3, lsl #2
+
add r0, r4, r3
rsb r3, r3, #0x4000 @ PTRS_PER_PGD*sizeof(long)
cmp r3, #0x0800 @ limit to 512MB
movhi r3, #0x0800
add r6, r0, r3
- ldr r3, [r8, #MACHINFO_PHYSIO]
- orr r3, r3, r7
+ mov r3, r7, lsr #20
+ ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
+ orr r3, r7, r3, lsl #20
1: str r3, [r0], #4
add r3, r3, #1 << 20
teq r0, r6
bne 1b
+
+#else /* CONFIG_DEBUG_ICEDCC */
+ /* we don't need any serial debugging mappings for ICEDCC */
+ ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
+#endif /* !CONFIG_DEBUG_ICEDCC */
+
#if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS)
/*
* If we're using the NetWinder or CATS, we also need to map