[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V2] xen/arm: UART addresses are not always aligned to a page.
On Wed, 2013-10-30 at 21:25 +0000, Andrew Cooper wrote: > 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 <jfraser@xxxxxxxxxxxx> > > --- > > 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 <asm/config.h> > > +#include <asm/early_printk.h> > > > > #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 <asm/processor-ca15.h> > > #include <asm/processor-ca7.h> > > #include <asm/asm_defns.h> > > +#include <asm/early_printk.h> > > > > #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 <asm/config.h> > > +#include <asm/early_printk.h> > > > > #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 <asm/config.h> > > #include <asm/page.h> > > #include <asm/asm_defns.h> > > +#include <asm/early_printk.h> > > > > #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 <xen/config.h> > > > > +#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 > The problem is that the C code in the include can't be included in the assembler files. I suppose that EARLY_UART_VIRTUAL_ADDRESS could be used in C code. I'd still have to ifdef out the C code in the include file for the assembler files. Jon > > + > > +#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 > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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