All of lore.kernel.org
 help / color / mirror / Atom feed
From: santosh.shilimkar@ti.com (Santosh Shilimkar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/8] ARM: mm: Add __pv_stub_mov to patch MOV instruction
Date: Fri, 21 Jun 2013 19:48:19 -0400	[thread overview]
Message-ID: <1371858502-10083-6-git-send-email-santosh.shilimkar@ti.com> (raw)
In-Reply-To: <1371858502-10083-1-git-send-email-santosh.shilimkar@ti.com>

From: Sricharan R <r.sricharan@ti.com>

Patch adds stub for MOV instruction. This is preparatory patch to
add the subsequent 64 bit patching which will use MOV stub.

For review simplicity the patch is kept as a separate change

Signed-off-by: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
---
 arch/arm/include/asm/memory.h |   10 ++++++++++
 arch/arm/kernel/head.S        |    2 ++
 arch/arm/kernel/vmlinux.lds.S |    5 +++++
 3 files changed, 17 insertions(+)

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 3d4f79c..d8a3ea6 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -172,6 +172,7 @@
  * so that all we need to do is modify the 8-bit constant field.
  */
 #define __PV_BITS_31_24	0x81000000
+#define __PV_BITS_7_0	0x81
 
 extern phys_addr_t (*arch_virt_to_idmap) (unsigned long x);
 extern unsigned long __pv_phys_offset;
@@ -188,6 +189,15 @@ extern unsigned long __pv_offset;
 	: "=r" (to)					\
 	: "r" (from), "I" (type))
 
+#define __pv_stub_mov(to, instr, type)			\
+	__asm__ volatile("@ __pv_stub_mov\n"		\
+	"1:	" instr "	%R0, %1\n"		\
+	"	.pushsection .pv_high_table,\"a\"\n"	\
+	"	.long	1b\n"				\
+	"	.popsection\n"				\
+	: "=r" (to)					\
+	: "I" (type))
+
 static inline phys_addr_t __virt_to_phys(unsigned long x)
 {
 	unsigned long t;
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 764e83b..b1bdeb5 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -565,6 +565,8 @@ ENDPROC(__fixup_pv_table)
 	.long	__pv_table_begin
 	.long	__pv_table_end
 2:	.long	__pv_phys_offset
+3:	.long	__pv_high_table_begin
+	.long	__pv_high_table_end
 
 	.text
 __fixup_a_pv_table:
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index a871b8e..cf17c7b 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -182,6 +182,11 @@ SECTIONS
 		*(.pv_table)
 		__pv_table_end = .;
 	}
+	.init.pv_high_table : {
+		__pv_high_table_begin = .;
+		*(.pv_high_table)
+		__pv_high_table_end = .;
+	}
 	.init.data : {
 #ifndef CONFIG_XIP_KERNEL
 		INIT_DATA
-- 
1.7.9.5

  parent reply	other threads:[~2013-06-21 23:48 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-21 23:48 [PATCH 0/8] ARM: mm: Extend the runtime patch stub for PAE systems Santosh Shilimkar
2013-06-21 23:48 ` [PATCH 1/8] ARM: mm: LPAE: use phys_addr_t appropriately in p2v and v2p conversions Santosh Shilimkar
2013-07-22 15:03   ` Nicolas Pitre
2013-06-21 23:48 ` [PATCH 2/8] ARM: mm: Introduce virt_to_idmap() with an arch hook Santosh Shilimkar
2013-06-21 23:48 ` [PATCH 3/8] ARM: mm: Move the idmap print to appropriate place in the code Santosh Shilimkar
2013-06-21 23:48 ` [PATCH 4/8] ARM: mm: Pass the constant as an argument to fixup_pv_table() Santosh Shilimkar
2013-06-21 23:48 ` Santosh Shilimkar [this message]
2013-06-21 23:48 ` [PATCH 6/8] ARM: mm: LPAE: Correct virt_to_phys patching for 64 bit physical addresses Santosh Shilimkar
2013-07-24  1:10   ` Nicolas Pitre
2013-07-24  2:01     ` Santosh Shilimkar
2013-07-24  2:49       ` Nicolas Pitre
2013-07-24 11:50         ` Sricharan R
2013-07-24 12:07           ` Sricharan R
2013-07-24 14:04             ` Santosh Shilimkar
2013-07-24 20:21             ` Nicolas Pitre
2013-07-25  3:49               ` Sricharan R
2013-07-25 18:53                 ` Santosh Shilimkar
2013-06-21 23:48 ` [PATCH 7/8] ARM: mm: Recreate kernel mappings in early_paging_init() Santosh Shilimkar
2013-06-21 23:48 ` [PATCH 8/8] ARM: keystone: Switch over to high physical address range Santosh Shilimkar
2013-06-22  1:51 ` [PATCH 0/8] ARM: mm: Extend the runtime patch stub for PAE systems Nicolas Pitre
2013-06-22  2:17   ` Santosh Shilimkar
2013-07-16 18:42   ` Santosh Shilimkar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1371858502-10083-6-git-send-email-santosh.shilimkar@ti.com \
    --to=santosh.shilimkar@ti.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.