- Add test for mode support, which is architecture dependent
- Add tests for address alignment and region size
- Add option to query for access rights
- The function goes through every PMP entry and tests if an address
range from [base, base+size] has been configured for desired
access rights.
- If several PMP entries match the range and access rights, the
information is combined
- End result is either no access, a partial match was found, or a full
match was found. Details about the partial match are not provided.
The intent for testing access rights and not just blindly applying them
is a case where they are already set in e.g. a bootloader. In this
case, nothing should be done, unless the configuration does not match,
in which case the software must not continue further.
NOTE: THIS ONLY WORKS WHEN KERNEL RUNS IN M-MODE FOR NOW
This frees the PMP for other use, e.g. HART memory separation.
The page tables are statically allocated, 1 per level.
This feature is now behind CONFIG_MPFS_USE_MMU_AS_MPU, because
only the MPFS target supports this (others are not tested).
If the MMU is used for memory separation within a HART, the PMP must
still be configured to allow user access to the memory mapped for the
HART, because PMP *rekoves* access by default. At this point all of
the user memory as well as the kernel RAM are opened.
A more flexible solution for PMP configuration will follow.
The old implementation used the default ld.script for the kernel side
which did not obey the memory.ld limits whatsoever.
Also, provide the user space addresses from the linker script to get rid
of the pre-processor macros that define (incorrect) default values for
the user space composition.
Summary:
- I noticed that make export does not work with swama5d4-ek:knsh
- This commit fixes this issue.
- NOTE: apps/Makefile also needs to be updated.
Impact:
- CONFIG_BUILD_KERNEL=y only
Testing:
- Build (make and make export) with sama5d4-ek:knsh
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
- remove some unneeded includes
- tab/space fixes
- change DEBUGPANIC to PANIC in noreturn function, otherwise it compiles only in DEBUG builds
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
The following options need to be taken in account while determining
the proper hart_index2id -table:
CONFIG_MPFS_HART1_SBI
CONFIG_MPFS_HART1_SBI
CONFIG_MPFS_HART3_SBI
CONFIG_MPFS_HART4_SBI
Unused harts should be marked with -1. Hart0 is never used so it
stays at -1.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
Commit 5d1a444812 replaced __attribute__
((unused)) with unused_code but two instances of __attribute__ ((used))
were also incorrectly replaced. Add used_code/used_data and used them
instead.
Some toolchains may be built without libm support, but using
such toochain should not generate any errors in case if math
functions are not used in the program
Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
Add two config flags for each hart for a bootloader nuttx:
CONFIG_MPFS_HARTx_SBI :
- select whether the hart boots via opensbi or not.
CONFIG_MPFS_HARTx_ENTRYPOINT :
- the target address to jump to, either directly from startup code or
from SBI if CONFIG_MPFS_HARTx_SBI is set
This allows building a nuttx based bootloader application, which can load
different applications/OSs for individual harts and jump to those
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
Hart index to hart id table is used to track unused and used harts. This
table is useful when configuring only some of the harts for OpenSBI use.
Mpfs will always have the hart0 unused, so mark it with -1.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
- Define RV_MMU_PT_LEVELS as the arch max
- Add way to find the PPN from a PTE
- Make utility function to create a satp register value, instead of
combining this to mmu_enable
- Add function to read the current satp value
- Add function to write the satp register, also fix the fence instruction
Sv39 is the only mode supported for now. However, it should be trivial
to extend the driver to support the other modes (including Sv32) as well.
The driver is tested with mpfs only, but it should work with any riscv
implementation.
u-boot/kernel may use any uart, not just uart1, depending
on the device tree configuration. They will also reset the
corresponding uarts as well. It doesn't need to be done
here.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
This drops the dependency to riscv_internal.h which ensures
less redefinition conflicts. OpenSBI declares some of the
variables again which are spread in many NuttX files.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
