xtensa: add MMU v3 support
authorMax Filippov <jcmvbkbc@gmail.com>
Mon, 3 Dec 2012 11:01:43 +0000 (15:01 +0400)
committerChris Zankel <chris@zankel.net>
Thu, 9 May 2013 08:07:09 +0000 (01:07 -0700)
commite85e335f8ff615f74e29e09cc2599f095600114b
tree8f09bbab5ca6a37f027fef17bf1de523ab574f10
parentd83ff0bb828854d9e7172ac5d8d007a7466934c9
xtensa: add MMU v3 support

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 <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
12 files changed:
arch/xtensa/Kconfig
arch/xtensa/boot/boot-elf/Makefile
arch/xtensa/boot/boot-elf/boot.lds.S
arch/xtensa/boot/boot-elf/bootstrap.S
arch/xtensa/boot/boot-uboot/Makefile
arch/xtensa/include/asm/initialize_mmu.h
arch/xtensa/include/asm/vectors.h [new file with mode: 0644]
arch/xtensa/kernel/Makefile
arch/xtensa/kernel/head.S
arch/xtensa/kernel/vectors.S
arch/xtensa/kernel/vmlinux.lds.S
arch/xtensa/mm/mmu.c