[U-Boot] [PATCH v2 1/6] PPC 85xx: Detect e500v2 / e500mc during runtime
Scott Wood
scottwood at freescale.com
Tue Feb 4 02:59:24 CET 2014
On Fri, 2014-01-31 at 12:16 +0100, Alexander Graf wrote:
> With the qemu-ppce500 machine type we can run the same board with
> either an e500v2 or an e500mc core plugged in.
>
> This means that the IVOR setup can't be based on compile time decisions,
> so instead we have to do a runtime check which CPU generation we're
> running on.
>
> Signed-off-by: Alexander Graf <agraf at suse.de>
> ---
> arch/powerpc/cpu/mpc85xx/fixed_ivor.S | 21 ++++++++++++++++-----
> 1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/cpu/mpc85xx/fixed_ivor.S b/arch/powerpc/cpu/mpc85xx/fixed_ivor.S
> index ebbb8c0..635a97e 100644
> --- a/arch/powerpc/cpu/mpc85xx/fixed_ivor.S
> +++ b/arch/powerpc/cpu/mpc85xx/fixed_ivor.S
> @@ -36,17 +36,25 @@
> SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
> SET_IVOR(15, 0x040) /* Debug */
>
> -/* e500v1 & e500v2 only */
> -#ifndef CONFIG_E500MC
> + /* Check for CPU */
> + mfpvr r3
> + srwi r3, r3, 16
> + /* Compare with e500mc PVR major number */
> + li r4, 0
> + ori r4, r4, 0x8023
> + cmpw r3, r4
> +
> + /* e500v1 & e500v2 only */
> + bge 1f
> SET_IVOR(32, 0x200) /* SPE Unavailable */
> SET_IVOR(33, 0x220) /* Embedded FP Data */
> SET_IVOR(34, 0x240) /* Embedded FP Round */
> -#endif
> +1:
>
> SET_IVOR(35, 0x260) /* Performance monitor */
>
> -/* e500mc only */
> -#ifdef CONFIG_E500MC
> + /* e500mc only */
> + blt 2f
> SET_IVOR(36, 0x280) /* Processor doorbell */
> SET_IVOR(37, 0x2a0) /* Processor doorbell critical */
> SET_IVOR(38, 0x2c0) /* Guest Processor doorbell */
> @@ -54,6 +62,8 @@
> SET_IVOR(40, 0x300) /* Hypervisor system call */
> SET_IVOR(41, 0x320) /* Hypervisor Priviledge */
>
> +#ifndef CONFIG_QEMU_E500
> + /* QEMU guests runs in guest mode and can't access GIVORs */
> SET_GIVOR(2, 0x060) /* Guest Data Storage */
> SET_GIVOR(3, 0x080) /* Guest Instruction Storage */
> SET_GIVOR(4, 0x0a0) /* Guest External Input */
> @@ -61,3 +71,4 @@
> SET_GIVOR(13, 0x1c0) /* Guest Data TLB Error */
> SET_GIVOR(14, 0x1e0) /* Guest Instruction TLB Error */
> #endif
> +2:
Again, let's please just remove this entire file.
Besides, who's to say that (non-KVM) QEMU doesn't someday start
emulating GIVORs? :-)
-Scott
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