From: "Jon Fraser" <jfraser@broadcom.com>
To: xen-devel@lists.xen.org
Cc: Jon Fraser <jfraser@broadcom.com>
Subject: [PATCH] xen/arm: UART addresses are not always aligned to a page.
Date: Thu, 24 Oct 2013 14:35:49 -0400 [thread overview]
Message-ID: <1382639749-27826-1-git-send-email-jfraser@broadcom.com> (raw)
Add the page offset of the UART to the mapped address.
Signed-off-by: Jon Fraser <jfraser@broadcom.com>
---
xen/arch/arm/arm32/debug.S | 5 +++--
xen/arch/arm/arm32/head.S | 3 ++-
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/xen/arch/arm/arm32/debug.S b/xen/arch/arm/arm32/debug.S
index ec774cd..e095911 100644
--- a/xen/arch/arm/arm32/debug.S
+++ b/xen/arch/arm/arm32/debug.S
@@ -22,18 +22,19 @@
#ifdef EARLY_PRINTK_INC
#include EARLY_PRINTK_INC
#endif
+#define UART_OFFSET (EARLY_UART_BASE_ADDRESS & ~PAGE_MASK)
/* Print a character on the UART - this function is called by C
* r0: character to print */
GLOBAL(early_putch)
- ldr r1, =FIXMAP_ADDR(FIXMAP_CONSOLE) /* r1 := VA UART base address */
+ ldr r1, =FIXMAP_ADDR(FIXMAP_CONSOLE) + UART_OFFSET /* r1 := VA UART base address */
early_uart_ready r1, r2
early_uart_transmit r1, r0
mov pc, lr
/* Flush the UART - this function is called by C */
GLOBAL(early_flush)
- ldr r1, =FIXMAP_ADDR(FIXMAP_CONSOLE) /* r1 := VA UART base address */
+ ldr r1, =FIXMAP_ADDR(FIXMAP_CONSOLE) + UART_OFFSET /* r1 := VA UART base address */
early_uart_ready r1, r2
mov pc, lr
diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index ce1d21a..aa8daec 100644
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -355,8 +355,9 @@ paging:
mov r4, r4, lsr #18 /* r4 := Slot for FIXMAP(0) */
strd r2, r3, [r1, r4] /* Map it in the fixmap's slot */
+#define UART_OFFSET (EARLY_UART_BASE_ADDRESS & ~PAGE_MASK)
/* Use a virtual address to access the UART. */
- ldr r11, =FIXMAP_ADDR(FIXMAP_CONSOLE)
+ ldr r11, =(FIXMAP_ADDR(FIXMAP_CONSOLE) + UART_OFFSET)
#endif
/* Map the DTB in the boot misc slot */
teq r12, #0 /* Only on boot CPU */
--
1.7.11.3
next reply other threads:[~2013-10-24 18:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-24 18:35 Jon Fraser [this message]
2013-10-25 11:28 ` [PATCH] xen/arm: UART addresses are not always aligned to a page Julien Grall
2013-10-25 22:43 ` Jon Fraser
2013-10-29 1:28 ` Jon Fraser
2013-10-30 18:57 ` Julien Grall
2013-10-31 16:15 ` Ian Campbell
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