- 26 Mar, 2014 40 commits
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Markos Chandras authored
Signed-off-by:
Markos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6581/Signed-off-by:
Ralf Baechle <ralf@linux-mips.org>
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Paul Burton authored
The previous NR_CPUS=2 default is not an optimal default for current Malta setups where it is common to have more than 2 CPUs available. It makes sense to increase this to a number which covers all common setups currently in use, such that all of those cores are usable. 8 seems to fit that description. If the user has less than 8 CPUs & they wish to have a more optimal kernel they can simply reduce this in their config. It makes sense for the default to work on as many systems as possible. Signed-off-by:
Paul Burton <paul.burton@imgtec.com> Signed-off-by:
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Paul Burton authored
For Malta defconfigs which may run on an SMP configuration without hardware cache anti-aliasing, a 16KB page size is a safer default. Most notably at the moment it will avoid cache aliasing issues for multicore proAptiv systems. Signed-off-by:
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Markos Chandras authored
Recent versions of udev and systemd require the kernel to be compiled with CONFIG_DEVTMPFS in order to populate the /dev directory. Most MIPS platforms have it enabled by default, so enable it for Malta configs as well. Signed-off-by:
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Paul Burton authored
This patch simply regenerates the malta defconfigs such that they don't change after being used & saved as a defconfig again. ie. it is the result of running the following: for cfg in arch/mips/configs/malta*; do ARCH=mips make `basename ${cfg}` ARCH=mips make savedefconfig mv -v defconfig ${cfg} done Signed-off-by: -
Manuel Lauss authored
The au1xxx-ide driver isn't any faster than pata_platform since it spends a lot of time busy waiting for DMA to finish; faster PIO/DMA modes only work on the db1200 with a certain cpu speed, UDMA is broken, and finally the old IDE layer is on death row, so time to switch to the newer ATA layer. Signed-off-by:
Manuel Lauss <manuel.lauss@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/6662/Signed-off-by:
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Manuel Lauss authored
Merge the db1200.h and db1300.h headers into their only users. Signed-off-by:
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Manuel Lauss authored
This patch merges support for all DB1xxx and PB1xxx boards into a single image, along with a new single defconfig for them. Run-tested on DB1300 and DB1500. Signed-off-by:
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Manuel Lauss authored
All Alchemy chips have coherent DMA, but for example the USB or AC97 peripherals on the Au1000/1500/1100 are not. This patch uses DMA_MAYBE_COHERENT on Alchemy and sets coherentio based on CPU type. Signed-off-by:
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Manuel Lauss authored
Setting DMA_MAYBE_COHERENT gives a platform the opportunity to select use of cache ops at boot. Signed-off-by:
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Markos Chandras authored
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Markos Chandras authored
Allow secondary cores to program their segment control registers during smp bootstrap code. This enables EVA on Malta SMP configurations Signed-off-by: -
Leonid Yegoshin authored
Shift System Controller memory mapping to 0x80000000 Signed-off-by:
Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by:
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Markos Chandras authored
Use a Malta specific function to free the init section once the kernel has booted. When operating in EVA mode, the physical memory is shifted to 0x80000000. Kernel is loaded into 0x80000000 (virtual) so the offset between physical and virtual addresses is 0. Signed-off-by: -
Markos Chandras authored
PHYS_OFFSET is used to denote the physical start address of the first bank of RAM. When the Malta board is in EVA mode, the physical start address of RAM is shifted to 0x80000000 so it's necessary to use this macro in order to make the code EVA agnostic. Signed-off-by: -
Markos Chandras authored
The 'ememsize' variable is used to denote the real RAM which is present on the Malta board. This is different compared to 'memsize' which is capped to 256MB. The 'ememsize' is used to get the actual physical memory when setting up the Malta memory layout. This only makes sense in case the core operates in the EVA mode, and it's ignored otherwise. Signed-off-by: -
Markos Chandras authored
Add a spaces.h file for Malta to override certain memory macros when operating in EVA mode. Signed-off-by: -
Markos Chandras authored
The Malta board aliases 0x80000000 - 0xffffffff to 0x00000000 - 0x7fffffff ignoring the 256 MB IO hole in 0x10000000. The physical memory is shifted to 0x80000000 so up to 2GB can be used. Kuseg is expanded to 3GB (due to board limitations only 2GB can be accessed) and lowmem (kernel space) is expanded to 2GB. The Segment Control registers are programmed as follows: Virtual memory Physical memory Mapping 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg) 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0) 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1) 0xc0000000 - 0xdfffffff - MK (kseg2) 0xe0000000 - 0xffffffff - MK (kseg3) The location of exception vectors remain the same since 0xbfc00000 (traditional exception base) still maps to 0x1fc00000 physical. Signed-off-by: -
Leonid Yegoshin authored
There is a chance for the secondary cache to have memory aliases. This can happen if the bootloader is in a non-EVA mode (or even in EVA mode but with different mapping from the kernel) and the kernel switching to EVA afterwards. It's best to flush the icache to avoid having the secondary CPUs fetching stale data from it. Signed-off-by:
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Markos Chandras authored
Use the userspace cache flushing functions if the interrupted process is a userspace one. Signed-off-by: -
Leonid Yegoshin authored
Build EVA specific cache flushing functions (ie cachee). They will be used by a subsequent patch. Signed-off-by:
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Markos Chandras authored
A core in EVA mode can have any possible segment mapping, so the default free_initmem_default() function may not always work as expected. Therefore, add a callback that platforms can use to free up the init section. Signed-off-by: -
Markos Chandras authored
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Markos Chandras authored
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Markos Chandras authored
The MIPS *Aptiv family uses bit 28 in Config5 CP0 register to indicate whether the core supports EVA or not. Signed-off-by: -
Leonid Yegoshin authored
This will allow platforms to use an alternative way to get the physical address of a symbol. Signed-off-by:
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Leonid Yegoshin authored
When flushing the icache, make sure the address limit is correct so the appropriate 'cache' instruction will be used. This has no impact on cores operating in non-eva mode. However, when EVA is enabled, we ensure that 'cache' will be used instead of 'cachee'. Signed-off-by:
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Leonid Yegoshin authored
Add EVA cache flushing functions similar to non-EVA configurations. Because the cache may or may not contain user virtual addresses, we need to use the 'cache' or 'cachee' instruction based on whether we flush the cache on behalf of kernel or user respectively. Signed-off-by:
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Leonid Yegoshin authored
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Leonid Yegoshin authored
Build code to invalidate an address range in the instruction cache using the Hit Invalidate cache operation. Signed-off-by:
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Leonid Yegoshin authored
EVA does not have FPU specific instructions for reading or writing FPU registers from userspace memory. Signed-off-by:
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Leonid Yegoshin authored
A MIPS specific csum_and_copy_from_user function is necessary because the generic one from include/net/checksum.h will not work for EVA. This is because the generic one will link to symbols from lib/checksum.c which are not EVA aware. Signed-off-by:
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Leonid Yegoshin authored
In EVA mode, different instructions need to be used to read/write from kernel and userland. In non-EVA mode, there is no functional difference. The current address limit is checked to decide the type of operation that will be performed. Signed-off-by:
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Markos Chandras authored
Use EVA specific functions to read and write data to user address space. Signed-off-by: -
Markos Chandras authored
In preparation for EVA support, we use a macro to build the __csum_partial_copy_user main code so it can be shared across multiple implementations. EVA uses the same code but it replaces the load/store/prefetch instructions with the EVA specific ones therefore using a macro avoids unnecessary code duplications. Signed-off-by: -
Markos Chandras authored
Each load/store macro always adds an entry to the __ex_table using the EXC macro. There are cases where a load instruction may never fail such as when we are sure the load happens in the kernel address space. Therefore, we merge these the EXC and LOADX/STOREX macros into a single one. We also expand the argument list in the EXC macro to make the macro more flexible. The extra 'type' argument is not used by this commit, but it will be used when EVA support is added to memcpy. Signed-off-by: -
Markos Chandras authored
The 'copy_user' symbol can be used to copy from or to userland so we will use two different symbols for these operations. This makes no difference in the existing code, but when the core is operating in EVA mode, different instructions need to be used to read and write to userland address space. The old function has also been renamed to 'copy_kernel' to denote that it is suitable for copy data to and from kernel space. Signed-off-by: -
Leonid Yegoshin authored
Handle unaligned accesses when we access userspace memory EVA mode. Signed-off-by:
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Markos Chandras authored
Use the load/store instruction wrappers from asm/asm.h to perform such operations when operating in EVA mode. Signed-off-by: -
Markos Chandras authored
The str*_user functions are used to securely access NULL terminated strings from userland. Therefore, it's necessary to use the appropriate EVA function. However, if the string is in kernel space, then the normal instructions are being used to access it. The __str*_kernel_asm and __str*_user_asm symbols are the same for non-EVA mode so there is no functional change for the non-EVA kernels. Signed-off-by:
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