[PATCH] PPC64: Switch to 32-bit mode in interrupts

[Alexander Graf]

All the code in OpenBIOS runs in 32 bits, which is fine. Now, when
an interrupt arrives, the 970 CPU automatically sets the MSR_SF bit,
making us run in 64 bit mode.

That breaks address calculation, because 'lis' and 'ba' get sign
extended.

In order to circumvent that mess, let's just go back to 32 bit mode
whenever we get an interrupt.

Signed-off-by: Alexander Graf 
---
 arch/ppc/qemu/start.S |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/ppc/qemu/start.S b/arch/ppc/qemu/start.S
index 857885a..66df9a2 100644
--- a/arch/ppc/qemu/start.S
+++ b/arch/ppc/qemu/start.S
@@ -34,6 +34,9 @@

#define EXCEPTION_PREAMBLE_TEMPLATE \
    mtsprg1	r1 ;				/* scratch */ \
+	mfmsr	r1 ;				/* unset MSR_SF */ \
+	clrlwi	r1,r1,0 ; \
+	mtmsr	r1 ; \
    mfsprg0	r1 ;				/* exception stack in sprg0 */ \
 .ifc ULONG_SIZE, 8 ; \
    addi	r1,r1,-(40 * ULONG_SIZE) ;	/* push exception frame */ \

[PATCH] Expose NVRAM compatibility

[Alexander Graf]

Linux requires the NVRAM to expose a 'nvram,flash' compatibility
in the device tree. Let's expose it so it's happy.

Signed-off-by: Alexander Graf 
---
 drivers/macio.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/macio.c b/drivers/macio.c
index e150a18..86824aa 100644
--- a/drivers/macio.c
+++ b/drivers/macio.c
@@ -71,6 +71,7 @@ void macio_nvram_init(const char *path, uint32_t addr)
    props[1] = __cpu_to_be32(nvram_size);
    set_property(dnode, "reg", (char *)&props, sizeof(props));
    set_property(dnode, "device_type", "nvram", 6);
+	set_property(dnode, "compatible", "nvram,flash", 12);

chosen = find_dev("/chosen");
    push_str(buf);

[PATCH] Expose PCI controller information

[Alexander Graf]

Linux tries to detect which PCI controller it's supposed to work with.
On PPC32 there is fallback code that doesn't get compiled with
CONFIG_PPC64, so we really have to expose a controller or we don't have
pci config space accessor functions.

Let's expose a un3-agp if we have a mac99 model, as that's what is
supposed to be in there anyways.

Signed-off-by: Alexander Graf 
---
 arch/ppc/qemu/init.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/ppc/qemu/init.c b/arch/ppc/qemu/init.c
index 9b7bdab..f53cdc7 100644
--- a/arch/ppc/qemu/init.c
+++ b/arch/ppc/qemu/init.c
@@ -561,6 +561,17 @@ arch_of_init( void )
    push_str("system-id");
    fword("property");

+	/* pci info */
+
+	if (machine_id == ARCH_MAC99) {
+		push_str("/pci");
+		fword("find-device");
+		push_str("u3-agp");
+		fword("encode-string");
+		push_str("compatible");
+		fword("property");
+	}
+
    /* memory info */

push_str("/memory");

[PATCH] Expose NVRAM compatibility

[Laurent Vivier]

Le 5 mars 09 à 22:24, Alexander Graf a écrit :
> Linux requires the NVRAM to expose a 'nvram,flash' compatibility
> in the device tree. Let's expose it so it's happy.
> Signed-off-by: Alexander Graf
>
> drivers/macio.c |    1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/macio.c b/drivers/macio.c
> index e150a18..86824aa 100644
> --- a/drivers/macio.c
> +++ b/drivers/macio.c
> @@ -71,6 +71,7 @@ void macio_nvram_init(const char *path, uint32_t  
> addr)
>    props[1] = __cpu_to_be32(nvram_size);
>    set_property(dnode, "reg", (char *)&props, sizeof(props));
>    set_property(dnode, "device_type", "nvram", 6);
> set_property(dnode, "compatible", "nvram,flash", 12);

This breaks oldworld nvram support, could you use something like:

NEWWORLD(set_property(dnode, "compatible", "nvram,flash", 12));
OLDWORLD(set_property(dnode, "compatible", "nvram", 6));

(OLDWORLD() already exists, you have to define NEWWORLD())
> chosen = find_dev("/chosen");
>    push_str(buf);
> -- 
> 1.6.0.2

[PATCH] Expose NVRAM compatibility

[Alexander Graf]

Laurent Vivier wrote:
> Le 5 mars 09 à 22:24, Alexander Graf a écrit :
> > Linux requires the NVRAM to expose a 'nvram,flash' compatibility
> > in the device tree. Let's expose it so it's happy.
> > Signed-off-by: Alexander Graf
> >
> > drivers/macio.c |    1 +
> > 1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/macio.c b/drivers/macio.c
> > index e150a18..86824aa 100644
> > --- a/drivers/macio.c
> > +++ b/drivers/macio.c
> > @@ -71,6 +71,7 @@ void macio_nvram_init(const char *path, uint32_t addr)
> >     props[1] = __cpu_to_be32(nvram_size);
> >     set_property(dnode, "reg", (char *)&props, sizeof(props));
> >     set_property(dnode, "device_type", "nvram", 6);
> > set_property(dnode, "compatible", "nvram,flash", 12);
>
> This breaks oldworld nvram support, could you use something like:
>
> NEWWORLD(set_property(dnode, "compatible", "nvram,flash", 12));
> OLDWORLD(set_property(dnode, "compatible", "nvram", 6));
>
> (OLDWORLD() already exists, you have to define NEWWORLD())

I'm not sure about the OLDWORLD part, as things work for me there, so I
just made it NEWWORLD only.

Alex