linux.git/arch/xtensa/kernel/Makefile, branch v3.16.64

xtensa: fix secondary core boot in SMP

2015-12-13T17:49:05+00:00

commit ab45fb145096799dabd18afc58bb5f97171017cd upstream.

There are multiple factors adding to the issue in different
configurations:

- commit 17290231df16eeee ("xtensa: add fixup for double exception raised
  in window overflow") added function window_overflow_restore_a0_fixup to
  double exception vector overlapping reset vector location of secondary
  processor cores.
- on MMUv2 cores RESET_VECTOR1_VADDR may point to uncached kernel memory
  making code overlapping depend on cache type and size, so that without
  cache or with WT cache reset vector code overwrites double exception
  code, making issue even harder to detect.
- on MMUv3 cores RESET_VECTOR1_VADDR may point to unmapped area, as
  MMUv3 cores change virtual address map to match MMUv2 layout, but
  reset vector virtual address is given for the original MMUv3 mapping.
- physical memory region of the secondary reset vector is not reserved
  in the physical memory map, and thus may be allocated and overwritten
  at arbitrary moment.

Fix it as follows:

- move window_overflow_restore_a0_fixup code to .text section.
- define RESET_VECTOR1_VADDR so that it points to reset vector in the
  cacheable MMUv2 map for cores with MMU.
- reserve reset vector region in the physical memory map. Drop separate
  literal section and build mxhead.S with text section literals.

Signed-off-by: Max Filippov 
Signed-off-by: Luis Henriques

xtensa: add SMP support

2014-01-14T18:19:58+00:00

This is largely based on SMP code from the xtensa-2.6.29-smp tree by
Piet Delaney, Marc Gauthier, Joe Taylor, Christian Zankel (and possibly
other Tensilica folks).

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add static function tracer support

2013-07-08T08:18:57+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add stacktrace support

2013-05-09T08:07:10+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add MMU v3 support

2013-05-09T08:07:09+00:00

MMUv3 comes out of reset with identity vaddr -> paddr mapping in the TLB
way 6:

Way 6 (512 MB)
        Vaddr       Paddr       ASID  Attr RWX Cache
        ----------  ----------  ----  ---- --- -------
        0x00000000  0x00000000  0x01  0x03 RWX Bypass
        0x20000000  0x20000000  0x01  0x03 RWX Bypass
        0x40000000  0x40000000  0x01  0x03 RWX Bypass
        0x60000000  0x60000000  0x01  0x03 RWX Bypass
        0x80000000  0x80000000  0x01  0x03 RWX Bypass
        0xa0000000  0xa0000000  0x01  0x03 RWX Bypass
        0xc0000000  0xc0000000  0x01  0x03 RWX Bypass
        0xe0000000  0xe0000000  0x01  0x03 RWX Bypass

This patch adds remapping code at the reset vector or at the kernel
_start (depending on CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) that
reconfigures MMUv3 as MMUv2:

Way 5 (128 MB)
        Vaddr       Paddr       ASID  Attr RWX Cache
        ----------  ----------  ----  ---- --- -------
        0xd0000000  0x00000000  0x01  0x07 RWX WB
        0xd8000000  0x00000000  0x01  0x03 RWX Bypass
Way 6 (256 MB)
        Vaddr       Paddr       ASID  Attr RWX Cache
        ----------  ----------  ----  ---- --- -------
        0xe0000000  0xf0000000  0x01  0x07 RWX WB
        0xf0000000  0xf0000000  0x01  0x03 RWX Bypass

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: clean up files to make them code-style compliant

2012-12-19T05:10:25+00:00

Remove heading and trailing spaces, trim trailing lines, and wrap lines
that are longer than 80 characters.

Signed-off-by: Chris Zankel

xtensa: adopt generic io routines

2012-10-03T22:11:42+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: fix linker script transformation for .text.unlikely

2012-10-03T22:11:04+00:00

Now that binutils generate *.unlikely sections which don't follow
documented (info as) literal section naming rules, section name
transformation script doesn't work well resulting in the following
errors at vmlinux link time:

	main.c:(.text.unlikely+0x3): dangerous relocation: l32r: literal
				     placed after use: .literal.unlikely

Fix section name transformation script by adding specific rule for
.text.unlikely sections.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: Use generic init_task

2012-05-05T11:00:26+00:00

Same code. Use the generic version.

Signed-off-by: Thomas Gleixner 
Cc: Chris Zankel 
Link: http://lkml.kernel.org/r/20120503085035.804059531@linutronix.de

xtensa: Fix linker script patch-up

2010-05-02T06:00:07+00:00

The Xtensa architecture requires to patch the generated linker script
to insert precede certain sections with a .literal section. Ammend the
sed script to fix-up only sequences that start with a '*':
'*(.init.text)' -> '*(.init.literal .init.text)'

Signed-off-by: Chris Zankel