From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: [PATCH V2] xen/arm: UART addresses are not always aligned to a page. Date: Wed, 30 Oct 2013 21:25:46 +0000 Message-ID: <5271795A.9060901@citrix.com> References: <1383167881-29571-1-git-send-email-jfraser@broadcom.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1383167881-29571-1-git-send-email-jfraser@broadcom.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Jon Fraser Cc: julien.grall@linaro.org, tim@xen.org, ian.campbell@citrix.com, xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On 30/10/13 21:18, Jon Fraser wrote: > When calculating the virtual address of the UART, > add the page offset of the UART to the mapped address. > > Create define EARLY_UART_VIRTUAL_ADDRESS and use instead > of FIXMAP_ADDR(FIXMAP_CONSOLE) > > Signed-off-by: Jon Fraser > --- > xen/arch/arm/arm32/debug.S | 5 +++-- > xen/arch/arm/arm32/head.S | 3 ++- > xen/arch/arm/arm64/debug.S | 5 +++-- > xen/arch/arm/arm64/head.S | 3 ++- > xen/include/asm-arm/early_printk.h | 10 ++++++++++ > 5 files changed, 20 insertions(+), 6 deletions(-) > > diff --git a/xen/arch/arm/arm32/debug.S b/xen/arch/arm/arm32/debug.S > index ec774cd..a95d9da 100644 > --- a/xen/arch/arm/arm32/debug.S > +++ b/xen/arch/arm/arm32/debug.S > @@ -18,6 +18,7 @@ > */ > > #include > +#include > > #ifdef EARLY_PRINTK_INC > #include EARLY_PRINTK_INC > @@ -26,14 +27,14 @@ > /* 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, =EARLY_UART_VIRTUAL_ADDRESS /* 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, =EARLY_UART_VIRTUAL_ADDRESS /* 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..96230ac 100644 > --- a/xen/arch/arm/arm32/head.S > +++ b/xen/arch/arm/arm32/head.S > @@ -22,6 +22,7 @@ > #include > #include > #include > +#include > > #define ZIMAGE_MAGIC_NUMBER 0x016f2818 > > @@ -356,7 +357,7 @@ paging: > strd r2, r3, [r1, r4] /* Map it in the fixmap's slot */ > > /* Use a virtual address to access the UART. */ > - ldr r11, =FIXMAP_ADDR(FIXMAP_CONSOLE) > + ldr r11, =EARLY_UART_VIRTUAL_ADDRESS > #endif > /* Map the DTB in the boot misc slot */ > teq r12, #0 /* Only on boot CPU */ > diff --git a/xen/arch/arm/arm64/debug.S b/xen/arch/arm/arm64/debug.S > index 472c157..a855358 100644 > --- a/xen/arch/arm/arm64/debug.S > +++ b/xen/arch/arm/arm64/debug.S > @@ -18,6 +18,7 @@ > */ > > #include > +#include > > #ifdef EARLY_PRINTK_INC > #include EARLY_PRINTK_INC > @@ -26,14 +27,14 @@ > /* Print a character on the UART - this function is called by C > * x0: character to print */ > GLOBAL(early_putch) > - ldr x15, =FIXMAP_ADDR(FIXMAP_CONSOLE) > + ldr x15, =EARLY_UART_VIRTUAL_ADDRESS > early_uart_ready x15, 1 > early_uart_transmit x15, w0 > ret > > /* Flush the UART - this function is called by C */ > GLOBAL(early_flush) > - ldr x15, =FIXMAP_ADDR(FIXMAP_CONSOLE) /* x15 := VA UART base address */ > + ldr x15, =EARLY_UART_VIRTUAL_ADDRESS /* x15 := VA UART base address */ > early_uart_ready x15, 1 > ret > > diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S > index b8b5902..31afdd0 100644 > --- a/xen/arch/arm/arm64/head.S > +++ b/xen/arch/arm/arm64/head.S > @@ -23,6 +23,7 @@ > #include > #include > #include > +#include > > #define PT_PT 0xe7f /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=111 T=1 P=1 */ > #define PT_MEM 0xe7d /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=111 T=0 P=1 */ > @@ -368,7 +369,7 @@ paging: > str x2, [x4, x1] /* Map it in the fixmap's slot */ > > /* Use a virtual address to access the UART. */ > - ldr x23, =FIXMAP_ADDR(FIXMAP_CONSOLE) > + ldr x23, =EARLY_UART_VIRTUAL_ADDRESS > #endif > > /* Map the DTB in the boot misc slot */ > diff --git a/xen/include/asm-arm/early_printk.h b/xen/include/asm-arm/early_printk.h > index 5f7c529..759d59a 100644 > --- a/xen/include/asm-arm/early_printk.h > +++ b/xen/include/asm-arm/early_printk.h > @@ -12,6 +12,14 @@ > > #include > > +#ifdef __ASSEMBLY__ > + > +/* need to add the uart address offset in page to the fixmap address */ > +#define EARLY_UART_VIRTUAL_ADDRESS \ > + (FIXMAP_ADDR(FIXMAP_CONSOLE) +(EARLY_UART_BASE_ADDRESS & ~PAGE_MASK)) Why should this be limited to assembly code? It would seem valid for early C code to see and use as well. With that change, you can drop all the #ifdef'ary ~Andrew > + > +#else > + > #ifdef EARLY_PRINTK > > void early_printk(const char *fmt, ...) > @@ -31,4 +39,6 @@ __attribute__((format (printf, 1, 2))) early_panic(const char *fmt, ...) > > #endif > > +#endif /* __ASSEMBLY__ */ > + > #endif