linux-toradex.git/arch/powerpc/kernel/head_fsl_booke.S, branch v4.9.48

ppc: move exports to definitions

2016-08-08T03:50:09+00:00

Signed-off-by: Al Viro

powerpc/cache: add cache flush operation for various e500

2016-03-05T05:44:51+00:00

Various e500 core have different cache architecture, so they
need different cache flush operations. Therefore, add a callback
function cpu_flush_caches to the struct cpu_spec. The cache flush
operation for the specific kind of e500 is selected at init time.
The callback function will flush all caches inside the current cpu.

Signed-off-by: Chenhui Zhao 
Signed-off-by: Tang Yuantian 
Signed-off-by: Scott Wood

powerpc: Move part of giveup_fpu,altivec,spe into c

2015-12-01T02:52:25+00:00

Move the MSR modification into new c functions. Removing it from
the low level functions will allow us to avoid costly MSR writes
by batching them up.

Move the check_if_tm_restore_required() check into these new functions.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc: Remove NULL task struct pointer checks in FP and vector code

2015-12-01T02:52:25+00:00

We used to allow giveup_*() to be called with a NULL task struct
pointer. Now those cases are handled in the caller we can remove
the checks. We can also remove giveup_altivec_notask() which is also
unused.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc: Remove UP only lazy floating point and vector optimisations

2015-12-01T02:52:24+00:00

The UP only lazy floating point and vector optimisations were written
back when SMP was not common, and neither glibc nor gcc used vector
instructions. Now SMP is very common, glibc aggressively uses vector
instructions and gcc autovectorises.

We want to add new optimisations that apply to both UP and SMP, but
in preparation for that remove these UP only optimisations.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc/booke: Revert SPE/AltiVec common defines for interrupt numbers

2014-09-22T08:11:31+00:00

Book3E specification defines shared interrupt numbers for SPE and AltiVec
units. Still SPE is present in e200/e500v2 cores while AltiVec is present in
e6500 core. So we can currently decide at compile-time which unit to support
exclusively. As Alexander Graf suggested, this will improve code readability
especially in KVM.

Use distinct defines to identify SPE/AltiVec interrupt numbers, reverting
c58ce397 and 6b310fc5 patches that added common defines.

Signed-off-by: Mihai Caraman 
Acked-by: Scott Wood 
Signed-off-by: Alexander Graf

powerpc/booke: Restrict SPE exception handlers to e200/e500 cores

2014-09-22T08:11:31+00:00

SPE exception handlers are now defined for 32-bit e500mc cores even though
SPE unit is not present and CONFIG_SPE is undefined.

Restrict SPE exception handlers to e200/e500 cores adding CONFIG_SPE_POSSIBLE
and consequently guard __stup_ivors and __setup_cpu functions.

Signed-off-by: Mihai Caraman 
Acked-by: Scott Wood 
Signed-off-by: Alexander Graf

powerpc/fsl_booke: smp support for booting a relocatable kernel above 64M

2014-01-09T23:52:18+00:00

When booting above the 64M for a secondary cpu, we also face the
same issue as the boot cpu that the PAGE_OFFSET map two different
physical address for the init tlb and the final map. So we have to use
switch_to_as1/restore_to_as0 between the conversion of these two
maps. When restoring to as0 for a secondary cpu, we only need to
return to the caller. So add a new parameter for function
restore_to_as0 for this purpose.

Use LOAD_REG_ADDR_PIC to get the address of variables which may
be used before we set the final map in cams for the secondary cpu.
Move the setting of cams a bit earlier in order to avoid the
unnecessary using of LOAD_REG_ADDR_PIC.

Signed-off-by: Kevin Hao 
Signed-off-by: Scott Wood

powerpc/fsl_booke: make sure PAGE_OFFSET map to memstart_addr for relocatable kernel

2014-01-09T23:52:17+00:00

This is always true for a non-relocatable kernel. Otherwise the kernel
would get stuck. But for a relocatable kernel, it seems a little
complicated. When booting a relocatable kernel, we just align the
kernel start addr to 64M and map the PAGE_OFFSET from there. The
relocation will base on this virtual address. But if this address
is not the same as the memstart_addr, we will have to change the
map of PAGE_OFFSET to the real memstart_addr and do another relocation
again.

Signed-off-by: Kevin Hao 
[scottwood@freescale.com: make offset long and non-negative in simple case]
Signed-off-by: Scott Wood

powerpc/fsl_booke: set the tlb entry for the kernel address in AS1

2014-01-09T23:52:16+00:00

We use the tlb1 entries to map low mem to the kernel space. In the
current code, it assumes that the first tlb entry would cover the
kernel image. But this is not true for some special cases, such as
when we run a relocatable kernel above the 64M or set
CONFIG_KERNEL_START above 64M. So we choose to switch to address
space 1 before setting these tlb entries.

Signed-off-by: Kevin Hao 
Signed-off-by: Scott Wood